rc80211-pid: export tuning parameters through debugfs
[linux-2.6-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
12#include <linux/kernel.h>
13#include <linux/skbuff.h>
14#include <linux/netdevice.h>
15#include <linux/etherdevice.h>
d4e46a3d 16#include <linux/rcupdate.h>
571ecf67
JB
17#include <net/mac80211.h>
18#include <net/ieee80211_radiotap.h>
19
20#include "ieee80211_i.h"
21#include "ieee80211_led.h"
571ecf67
JB
22#include "wep.h"
23#include "wpa.h"
24#include "tkip.h"
25#include "wme.h"
26
b2e7771e
JB
27/*
28 * monitor mode reception
29 *
30 * This function cleans up the SKB, i.e. it removes all the stuff
31 * only useful for monitoring.
32 */
33static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
34 struct sk_buff *skb,
35 int rtap_len)
36{
37 skb_pull(skb, rtap_len);
38
39 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
40 if (likely(skb->len > FCS_LEN))
41 skb_trim(skb, skb->len - FCS_LEN);
42 else {
43 /* driver bug */
44 WARN_ON(1);
45 dev_kfree_skb(skb);
46 skb = NULL;
47 }
48 }
49
50 return skb;
51}
52
53static inline int should_drop_frame(struct ieee80211_rx_status *status,
54 struct sk_buff *skb,
55 int present_fcs_len,
56 int radiotap_len)
57{
58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
62 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
63 return 1;
98f0b0a3
RR
64 if (((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
65 cpu_to_le16(IEEE80211_FTYPE_CTL)) &&
66 ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) !=
67 cpu_to_le16(IEEE80211_STYPE_PSPOLL)))
b2e7771e
JB
68 return 1;
69 return 0;
70}
71
72/*
73 * This function copies a received frame to all monitor interfaces and
74 * returns a cleaned-up SKB that no longer includes the FCS nor the
75 * radiotap header the driver might have added.
76 */
77static struct sk_buff *
78ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
79 struct ieee80211_rx_status *status)
80{
81 struct ieee80211_sub_if_data *sdata;
82 struct ieee80211_rate *rate;
83 int needed_headroom = 0;
c49e5ea3
JB
84 struct ieee80211_radiotap_header *rthdr;
85 __le64 *rttsft = NULL;
86 struct ieee80211_rtap_fixed_data {
b2e7771e
JB
87 u8 flags;
88 u8 rate;
89 __le16 chan_freq;
90 __le16 chan_flags;
91 u8 antsignal;
92 u8 padding_for_rxflags;
93 __le16 rx_flags;
c49e5ea3 94 } __attribute__ ((packed)) *rtfixed;
b2e7771e
JB
95 struct sk_buff *skb, *skb2;
96 struct net_device *prev_dev = NULL;
97 int present_fcs_len = 0;
98 int rtap_len = 0;
99
100 /*
101 * First, we may need to make a copy of the skb because
102 * (1) we need to modify it for radiotap (if not present), and
103 * (2) the other RX handlers will modify the skb we got.
104 *
105 * We don't need to, of course, if we aren't going to return
106 * the SKB because it has a bad FCS/PLCP checksum.
107 */
108 if (status->flag & RX_FLAG_RADIOTAP)
109 rtap_len = ieee80211_get_radiotap_len(origskb->data);
110 else
c49e5ea3
JB
111 /* room for radiotap header, always present fields and TSFT */
112 needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8;
b2e7771e
JB
113
114 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
115 present_fcs_len = FCS_LEN;
116
117 if (!local->monitors) {
118 if (should_drop_frame(status, origskb, present_fcs_len,
119 rtap_len)) {
120 dev_kfree_skb(origskb);
121 return NULL;
122 }
123
124 return remove_monitor_info(local, origskb, rtap_len);
125 }
126
127 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
128 /* only need to expand headroom if necessary */
129 skb = origskb;
130 origskb = NULL;
131
132 /*
133 * This shouldn't trigger often because most devices have an
134 * RX header they pull before we get here, and that should
135 * be big enough for our radiotap information. We should
136 * probably export the length to drivers so that we can have
137 * them allocate enough headroom to start with.
138 */
139 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 140 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB
141 dev_kfree_skb(skb);
142 return NULL;
143 }
144 } else {
145 /*
146 * Need to make a copy and possibly remove radiotap header
147 * and FCS from the original.
148 */
149 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
150
151 origskb = remove_monitor_info(local, origskb, rtap_len);
152
153 if (!skb)
154 return origskb;
155 }
156
157 /* if necessary, prepend radiotap information */
158 if (!(status->flag & RX_FLAG_RADIOTAP)) {
c49e5ea3
JB
159 rtfixed = (void *) skb_push(skb, sizeof(*rtfixed));
160 rtap_len = sizeof(*rthdr) + sizeof(*rtfixed);
161 if (status->flag & RX_FLAG_TSFT) {
162 rttsft = (void *) skb_push(skb, sizeof(*rttsft));
163 rtap_len += 8;
164 }
b2e7771e
JB
165 rthdr = (void *) skb_push(skb, sizeof(*rthdr));
166 memset(rthdr, 0, sizeof(*rthdr));
c49e5ea3
JB
167 memset(rtfixed, 0, sizeof(*rtfixed));
168 rthdr->it_present =
b2e7771e
JB
169 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
170 (1 << IEEE80211_RADIOTAP_RATE) |
171 (1 << IEEE80211_RADIOTAP_CHANNEL) |
172 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) |
173 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
c49e5ea3
JB
174 rtfixed->flags = 0;
175 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
176 rtfixed->flags |= IEEE80211_RADIOTAP_F_FCS;
177
178 if (rttsft) {
179 *rttsft = cpu_to_le64(status->mactime);
180 rthdr->it_present |=
181 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
182 }
b2e7771e
JB
183
184 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
c49e5ea3 185 rtfixed->rx_flags = 0;
b2e7771e
JB
186 if (status->flag &
187 (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
c49e5ea3 188 rtfixed->rx_flags |=
b2e7771e
JB
189 cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
190
191 rate = ieee80211_get_rate(local, status->phymode,
192 status->rate);
193 if (rate)
c49e5ea3 194 rtfixed->rate = rate->rate / 5;
b2e7771e 195
c49e5ea3 196 rtfixed->chan_freq = cpu_to_le16(status->freq);
b2e7771e
JB
197
198 if (status->phymode == MODE_IEEE80211A)
c49e5ea3 199 rtfixed->chan_flags =
b2e7771e
JB
200 cpu_to_le16(IEEE80211_CHAN_OFDM |
201 IEEE80211_CHAN_5GHZ);
202 else
c49e5ea3 203 rtfixed->chan_flags =
b2e7771e
JB
204 cpu_to_le16(IEEE80211_CHAN_DYN |
205 IEEE80211_CHAN_2GHZ);
206
c49e5ea3
JB
207 rtfixed->antsignal = status->ssi;
208 rthdr->it_len = cpu_to_le16(rtap_len);
b2e7771e
JB
209 }
210
211 skb_set_mac_header(skb, 0);
212 skb->ip_summed = CHECKSUM_UNNECESSARY;
213 skb->pkt_type = PACKET_OTHERHOST;
214 skb->protocol = htons(ETH_P_802_2);
215
216 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
217 if (!netif_running(sdata->dev))
218 continue;
219
220 if (sdata->type != IEEE80211_IF_TYPE_MNTR)
221 continue;
222
223 if (prev_dev) {
224 skb2 = skb_clone(skb, GFP_ATOMIC);
225 if (skb2) {
226 skb2->dev = prev_dev;
227 netif_rx(skb2);
228 }
229 }
230
231 prev_dev = sdata->dev;
232 sdata->dev->stats.rx_packets++;
233 sdata->dev->stats.rx_bytes += skb->len;
234 }
235
236 if (prev_dev) {
237 skb->dev = prev_dev;
238 netif_rx(skb);
239 } else
240 dev_kfree_skb(skb);
241
242 return origskb;
243}
244
245
571ecf67
JB
246/* pre-rx handlers
247 *
248 * these don't have dev/sdata fields in the rx data
52865dfd
JB
249 * The sta value should also not be used because it may
250 * be NULL even though a STA (in IBSS mode) will be added.
571ecf67
JB
251 */
252
6e0d114d
JB
253static ieee80211_txrx_result
254ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
255{
256 u8 *data = rx->skb->data;
257 int tid;
258
259 /* does the frame have a qos control field? */
260 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
261 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
262 /* frame has qos control */
263 tid = qc[0] & QOS_CONTROL_TID_MASK;
fd4c7f2f 264 if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
64bd4b69 265 rx->flags |= IEEE80211_TXRXD_RX_AMSDU;
fd4c7f2f 266 else
64bd4b69 267 rx->flags &= ~IEEE80211_TXRXD_RX_AMSDU;
6e0d114d
JB
268 } else {
269 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
270 /* Separate TID for management frames */
271 tid = NUM_RX_DATA_QUEUES - 1;
272 } else {
273 /* no qos control present */
274 tid = 0; /* 802.1d - Best Effort */
275 }
276 }
52865dfd 277
6e0d114d 278 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
52865dfd
JB
279 /* only a debug counter, sta might not be assigned properly yet */
280 if (rx->sta)
6e0d114d 281 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
6e0d114d
JB
282
283 rx->u.rx.queue = tid;
284 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
285 * For now, set skb->priority to 0 for other cases. */
286 rx->skb->priority = (tid > 7) ? 0 : tid;
287
288 return TXRX_CONTINUE;
289}
290
571ecf67
JB
291static ieee80211_txrx_result
292ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
293{
294 struct ieee80211_local *local = rx->local;
295 struct sk_buff *skb = rx->skb;
296 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
297 u32 load = 0, hdrtime;
298 struct ieee80211_rate *rate;
299 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
300 int i;
301
302 /* Estimate total channel use caused by this frame */
303
304 if (unlikely(mode->num_rates < 0))
305 return TXRX_CONTINUE;
306
307 rate = &mode->rates[0];
308 for (i = 0; i < mode->num_rates; i++) {
309 if (mode->rates[i].val == rx->u.rx.status->rate) {
310 rate = &mode->rates[i];
311 break;
312 }
313 }
314
315 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
316 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
317
318 if (mode->mode == MODE_IEEE80211A ||
571ecf67
JB
319 (mode->mode == MODE_IEEE80211G &&
320 rate->flags & IEEE80211_RATE_ERP))
321 hdrtime = CHAN_UTIL_HDR_SHORT;
322 else
323 hdrtime = CHAN_UTIL_HDR_LONG;
324
325 load = hdrtime;
326 if (!is_multicast_ether_addr(hdr->addr1))
327 load += hdrtime;
328
329 load += skb->len * rate->rate_inv;
330
331 /* Divide channel_use by 8 to avoid wrapping around the counter */
332 load >>= CHAN_UTIL_SHIFT;
333 local->channel_use_raw += load;
571ecf67
JB
334 rx->u.rx.load = load;
335
336 return TXRX_CONTINUE;
337}
338
339ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
340{
341 ieee80211_rx_h_parse_qos,
342 ieee80211_rx_h_load_stats,
343 NULL
344};
345
346/* rx handlers */
347
348static ieee80211_txrx_result
349ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
350{
52865dfd
JB
351 if (rx->sta)
352 rx->sta->channel_use_raw += rx->u.rx.load;
571ecf67
JB
353 rx->sdata->channel_use_raw += rx->u.rx.load;
354 return TXRX_CONTINUE;
355}
356
571ecf67
JB
357static ieee80211_txrx_result
358ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
359{
360 struct ieee80211_local *local = rx->local;
361 struct sk_buff *skb = rx->skb;
362
ece8eddd
ZY
363 if (unlikely(local->sta_hw_scanning))
364 return ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
365
366 if (unlikely(local->sta_sw_scanning)) {
367 /* drop all the other packets during a software scan anyway */
368 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status)
369 != TXRX_QUEUED)
370 dev_kfree_skb(skb);
571ecf67
JB
371 return TXRX_QUEUED;
372 }
373
badffb72 374 if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
571ecf67
JB
375 /* scanning finished during invoking of handlers */
376 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
377 return TXRX_DROP;
378 }
379
380 return TXRX_CONTINUE;
381}
382
383static ieee80211_txrx_result
384ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
385{
386 struct ieee80211_hdr *hdr;
571ecf67
JB
387 hdr = (struct ieee80211_hdr *) rx->skb->data;
388
389 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
390 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
391 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
392 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
393 hdr->seq_ctrl)) {
badffb72 394 if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
571ecf67
JB
395 rx->local->dot11FrameDuplicateCount++;
396 rx->sta->num_duplicates++;
397 }
398 return TXRX_DROP;
399 } else
400 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
401 }
402
571ecf67
JB
403 if (unlikely(rx->skb->len < 16)) {
404 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
405 return TXRX_DROP;
406 }
407
badffb72 408 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
571ecf67
JB
409 rx->skb->pkt_type = PACKET_OTHERHOST;
410 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
411 rx->skb->pkt_type = PACKET_HOST;
412 else if (is_multicast_ether_addr(hdr->addr1)) {
413 if (is_broadcast_ether_addr(hdr->addr1))
414 rx->skb->pkt_type = PACKET_BROADCAST;
415 else
416 rx->skb->pkt_type = PACKET_MULTICAST;
417 } else
418 rx->skb->pkt_type = PACKET_OTHERHOST;
419
420 /* Drop disallowed frame classes based on STA auth/assoc state;
421 * IEEE 802.11, Chap 5.5.
422 *
423 * 80211.o does filtering only based on association state, i.e., it
424 * drops Class 3 frames from not associated stations. hostapd sends
425 * deauth/disassoc frames when needed. In addition, hostapd is
426 * responsible for filtering on both auth and assoc states.
427 */
428 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
429 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
430 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
431 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
432 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
433 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
434 !(rx->fc & IEEE80211_FCTL_TODS) &&
435 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
badffb72 436 || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
571ecf67
JB
437 /* Drop IBSS frames and frames for other hosts
438 * silently. */
439 return TXRX_DROP;
440 }
441
f9d540ee 442 return TXRX_DROP;
571ecf67
JB
443 }
444
570bd537
JB
445 return TXRX_CONTINUE;
446}
447
448
449static ieee80211_txrx_result
1990af8d 450ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
570bd537
JB
451{
452 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
3017b80b
JB
453 int keyidx;
454 int hdrlen;
e2f036da 455 ieee80211_txrx_result result = TXRX_DROP;
d4e46a3d 456 struct ieee80211_key *stakey = NULL;
570bd537 457
3017b80b
JB
458 /*
459 * Key selection 101
460 *
461 * There are three types of keys:
462 * - GTK (group keys)
463 * - PTK (pairwise keys)
464 * - STK (station-to-station pairwise keys)
465 *
466 * When selecting a key, we have to distinguish between multicast
467 * (including broadcast) and unicast frames, the latter can only
468 * use PTKs and STKs while the former always use GTKs. Unless, of
469 * course, actual WEP keys ("pre-RSNA") are used, then unicast
470 * frames can also use key indizes like GTKs. Hence, if we don't
471 * have a PTK/STK we check the key index for a WEP key.
472 *
8dc06a1c
JB
473 * Note that in a regular BSS, multicast frames are sent by the
474 * AP only, associated stations unicast the frame to the AP first
475 * which then multicasts it on their behalf.
476 *
3017b80b
JB
477 * There is also a slight problem in IBSS mode: GTKs are negotiated
478 * with each station, that is something we don't currently handle.
8dc06a1c
JB
479 * The spec seems to expect that one negotiates the same key with
480 * every station but there's no such requirement; VLANs could be
481 * possible.
3017b80b
JB
482 */
483
484 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
485 return TXRX_CONTINUE;
571ecf67 486
3017b80b 487 /*
1990af8d 488 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB
489 * addressed to us nor a multicast frame.
490 */
badffb72 491 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
3017b80b
JB
492 return TXRX_CONTINUE;
493
d4e46a3d
JB
494 if (rx->sta)
495 stakey = rcu_dereference(rx->sta->key);
496
497 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
498 rx->key = stakey;
571ecf67 499 } else {
3017b80b
JB
500 /*
501 * The device doesn't give us the IV so we won't be
502 * able to look up the key. That's ok though, we
503 * don't need to decrypt the frame, we just won't
504 * be able to keep statistics accurate.
505 * Except for key threshold notifications, should
506 * we somehow allow the driver to tell us which key
507 * the hardware used if this flag is set?
508 */
7848ba7d
JB
509 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
510 (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
3017b80b
JB
511 return TXRX_CONTINUE;
512
513 hdrlen = ieee80211_get_hdrlen(rx->fc);
514
515 if (rx->skb->len < 8 + hdrlen)
516 return TXRX_DROP; /* TODO: count this? */
517
518 /*
519 * no need to call ieee80211_wep_get_keyidx,
520 * it verifies a bunch of things we've done already
521 */
522 keyidx = rx->skb->data[hdrlen + 3] >> 6;
523
d4e46a3d 524 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
3017b80b
JB
525
526 /*
527 * RSNA-protected unicast frames should always be sent with
528 * pairwise or station-to-station keys, but for WEP we allow
529 * using a key index as well.
530 */
8f20fc24 531 if (rx->key && rx->key->conf.alg != ALG_WEP &&
3017b80b
JB
532 !is_multicast_ether_addr(hdr->addr1))
533 rx->key = NULL;
571ecf67
JB
534 }
535
3017b80b 536 if (rx->key) {
571ecf67 537 rx->key->tx_rx_count++;
011bfcc4 538 /* TODO: add threshold stuff again */
1990af8d 539 } else {
7f3ad894 540#ifdef CONFIG_MAC80211_DEBUG
70f08765
JB
541 if (net_ratelimit())
542 printk(KERN_DEBUG "%s: RX protected frame,"
543 " but have no key\n", rx->dev->name);
7f3ad894 544#endif /* CONFIG_MAC80211_DEBUG */
70f08765
JB
545 return TXRX_DROP;
546 }
547
1990af8d
JB
548 /* Check for weak IVs if possible */
549 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
550 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
551 (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
552 !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
553 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
554 rx->sta->wep_weak_iv_count++;
555
70f08765
JB
556 switch (rx->key->conf.alg) {
557 case ALG_WEP:
e2f036da
MN
558 result = ieee80211_crypto_wep_decrypt(rx);
559 break;
70f08765 560 case ALG_TKIP:
e2f036da
MN
561 result = ieee80211_crypto_tkip_decrypt(rx);
562 break;
70f08765 563 case ALG_CCMP:
e2f036da
MN
564 result = ieee80211_crypto_ccmp_decrypt(rx);
565 break;
70f08765
JB
566 }
567
e2f036da
MN
568 /* either the frame has been decrypted or will be dropped */
569 rx->u.rx.status->flag |= RX_FLAG_DECRYPTED;
570
571 return result;
70f08765
JB
572}
573
571ecf67
JB
574static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
575{
576 struct ieee80211_sub_if_data *sdata;
0795af57
JP
577 DECLARE_MAC_BUF(mac);
578
571ecf67
JB
579 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
580
581 if (sdata->bss)
582 atomic_inc(&sdata->bss->num_sta_ps);
583 sta->flags |= WLAN_STA_PS;
584 sta->pspoll = 0;
585#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57
JP
586 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
587 dev->name, print_mac(mac, sta->addr), sta->aid);
571ecf67
JB
588#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
589}
590
591static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
592{
593 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
594 struct sk_buff *skb;
595 int sent = 0;
596 struct ieee80211_sub_if_data *sdata;
597 struct ieee80211_tx_packet_data *pkt_data;
0795af57 598 DECLARE_MAC_BUF(mac);
571ecf67
JB
599
600 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
601 if (sdata->bss)
602 atomic_dec(&sdata->bss->num_sta_ps);
603 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
604 sta->pspoll = 0;
605 if (!skb_queue_empty(&sta->ps_tx_buf)) {
606 if (local->ops->set_tim)
607 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
608 if (sdata->bss)
609 bss_tim_clear(local, sdata->bss, sta->aid);
610 }
611#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57
JP
612 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
613 dev->name, print_mac(mac, sta->addr), sta->aid);
571ecf67
JB
614#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
615 /* Send all buffered frames to the station */
616 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
617 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
618 sent++;
e8bf9649 619 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
571ecf67
JB
620 dev_queue_xmit(skb);
621 }
622 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
623 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
624 local->total_ps_buffered--;
625 sent++;
626#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57 627 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
571ecf67 628 "since STA not sleeping anymore\n", dev->name,
0795af57 629 print_mac(mac, sta->addr), sta->aid);
571ecf67 630#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
e8bf9649 631 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
571ecf67
JB
632 dev_queue_xmit(skb);
633 }
634
635 return sent;
636}
637
638static ieee80211_txrx_result
639ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
640{
641 struct sta_info *sta = rx->sta;
642 struct net_device *dev = rx->dev;
643 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
644
645 if (!sta)
646 return TXRX_CONTINUE;
647
648 /* Update last_rx only for IBSS packets which are for the current
649 * BSSID to avoid keeping the current IBSS network alive in cases where
650 * other STAs are using different BSSID. */
651 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
652 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
653 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
654 sta->last_rx = jiffies;
655 } else
656 if (!is_multicast_ether_addr(hdr->addr1) ||
657 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
658 /* Update last_rx only for unicast frames in order to prevent
659 * the Probe Request frames (the only broadcast frames from a
660 * STA in infrastructure mode) from keeping a connection alive.
661 */
662 sta->last_rx = jiffies;
663 }
664
badffb72 665 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
571ecf67
JB
666 return TXRX_CONTINUE;
667
668 sta->rx_fragments++;
669 sta->rx_bytes += rx->skb->len;
6c55aa97
LF
670 sta->last_rssi = rx->u.rx.status->ssi;
671 sta->last_signal = rx->u.rx.status->signal;
672 sta->last_noise = rx->u.rx.status->noise;
571ecf67
JB
673
674 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
675 /* Change STA power saving mode only in the end of a frame
676 * exchange sequence */
677 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
678 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
679 else if (!(sta->flags & WLAN_STA_PS) &&
680 (rx->fc & IEEE80211_FCTL_PM))
681 ap_sta_ps_start(dev, sta);
682 }
683
684 /* Drop data::nullfunc frames silently, since they are used only to
685 * control station power saving mode. */
686 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
687 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
688 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
689 /* Update counter and free packet here to avoid counting this
690 * as a dropped packed. */
691 sta->rx_packets++;
692 dev_kfree_skb(rx->skb);
693 return TXRX_QUEUED;
694 }
695
696 return TXRX_CONTINUE;
697} /* ieee80211_rx_h_sta_process */
698
571ecf67
JB
699static inline struct ieee80211_fragment_entry *
700ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
701 unsigned int frag, unsigned int seq, int rx_queue,
702 struct sk_buff **skb)
703{
704 struct ieee80211_fragment_entry *entry;
705 int idx;
706
707 idx = sdata->fragment_next;
708 entry = &sdata->fragments[sdata->fragment_next++];
709 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
710 sdata->fragment_next = 0;
711
712 if (!skb_queue_empty(&entry->skb_list)) {
713#ifdef CONFIG_MAC80211_DEBUG
714 struct ieee80211_hdr *hdr =
715 (struct ieee80211_hdr *) entry->skb_list.next->data;
0795af57
JP
716 DECLARE_MAC_BUF(mac);
717 DECLARE_MAC_BUF(mac2);
571ecf67
JB
718 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
719 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0795af57 720 "addr1=%s addr2=%s\n",
571ecf67
JB
721 sdata->dev->name, idx,
722 jiffies - entry->first_frag_time, entry->seq,
0795af57
JP
723 entry->last_frag, print_mac(mac, hdr->addr1),
724 print_mac(mac2, hdr->addr2));
571ecf67
JB
725#endif /* CONFIG_MAC80211_DEBUG */
726 __skb_queue_purge(&entry->skb_list);
727 }
728
729 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
730 *skb = NULL;
731 entry->first_frag_time = jiffies;
732 entry->seq = seq;
733 entry->rx_queue = rx_queue;
734 entry->last_frag = frag;
735 entry->ccmp = 0;
736 entry->extra_len = 0;
737
738 return entry;
739}
740
741static inline struct ieee80211_fragment_entry *
742ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
743 u16 fc, unsigned int frag, unsigned int seq,
744 int rx_queue, struct ieee80211_hdr *hdr)
745{
746 struct ieee80211_fragment_entry *entry;
747 int i, idx;
748
749 idx = sdata->fragment_next;
750 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
751 struct ieee80211_hdr *f_hdr;
752 u16 f_fc;
753
754 idx--;
755 if (idx < 0)
756 idx = IEEE80211_FRAGMENT_MAX - 1;
757
758 entry = &sdata->fragments[idx];
759 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
760 entry->rx_queue != rx_queue ||
761 entry->last_frag + 1 != frag)
762 continue;
763
764 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
765 f_fc = le16_to_cpu(f_hdr->frame_control);
766
767 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
768 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
769 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
770 continue;
771
772 if (entry->first_frag_time + 2 * HZ < jiffies) {
773 __skb_queue_purge(&entry->skb_list);
774 continue;
775 }
776 return entry;
777 }
778
779 return NULL;
780}
781
782static ieee80211_txrx_result
783ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
784{
785 struct ieee80211_hdr *hdr;
786 u16 sc;
787 unsigned int frag, seq;
788 struct ieee80211_fragment_entry *entry;
789 struct sk_buff *skb;
0795af57 790 DECLARE_MAC_BUF(mac);
571ecf67
JB
791
792 hdr = (struct ieee80211_hdr *) rx->skb->data;
793 sc = le16_to_cpu(hdr->seq_ctrl);
794 frag = sc & IEEE80211_SCTL_FRAG;
795
796 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
797 (rx->skb)->len < 24 ||
798 is_multicast_ether_addr(hdr->addr1))) {
799 /* not fragmented */
800 goto out;
801 }
802 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
803
804 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
805
806 if (frag == 0) {
807 /* This is the first fragment of a new frame. */
808 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
809 rx->u.rx.queue, &(rx->skb));
8f20fc24 810 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
571ecf67
JB
811 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
812 /* Store CCMP PN so that we can verify that the next
813 * fragment has a sequential PN value. */
814 entry->ccmp = 1;
815 memcpy(entry->last_pn,
816 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
817 CCMP_PN_LEN);
818 }
819 return TXRX_QUEUED;
820 }
821
822 /* This is a fragment for a frame that should already be pending in
823 * fragment cache. Add this fragment to the end of the pending entry.
824 */
825 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
826 rx->u.rx.queue, hdr);
827 if (!entry) {
828 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
829 return TXRX_DROP;
830 }
831
832 /* Verify that MPDUs within one MSDU have sequential PN values.
833 * (IEEE 802.11i, 8.3.3.4.5) */
834 if (entry->ccmp) {
835 int i;
836 u8 pn[CCMP_PN_LEN], *rpn;
8f20fc24 837 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
571ecf67
JB
838 return TXRX_DROP;
839 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
840 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
841 pn[i]++;
842 if (pn[i])
843 break;
844 }
845 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
846 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
1a84f3fd
JB
847 if (net_ratelimit())
848 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
0795af57 849 "sequential A2=%s"
1a84f3fd
JB
850 " PN=%02x%02x%02x%02x%02x%02x "
851 "(expected %02x%02x%02x%02x%02x%02x)\n",
0795af57 852 rx->dev->name, print_mac(mac, hdr->addr2),
1a84f3fd
JB
853 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
854 rpn[5], pn[0], pn[1], pn[2], pn[3],
855 pn[4], pn[5]);
571ecf67
JB
856 return TXRX_DROP;
857 }
858 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
859 }
860
861 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
862 __skb_queue_tail(&entry->skb_list, rx->skb);
863 entry->last_frag = frag;
864 entry->extra_len += rx->skb->len;
865 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
866 rx->skb = NULL;
867 return TXRX_QUEUED;
868 }
869
870 rx->skb = __skb_dequeue(&entry->skb_list);
871 if (skb_tailroom(rx->skb) < entry->extra_len) {
872 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
873 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
874 GFP_ATOMIC))) {
875 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
876 __skb_queue_purge(&entry->skb_list);
877 return TXRX_DROP;
878 }
879 }
880 while ((skb = __skb_dequeue(&entry->skb_list))) {
881 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
882 dev_kfree_skb(skb);
883 }
884
885 /* Complete frame has been reassembled - process it now */
badffb72 886 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
571ecf67
JB
887
888 out:
889 if (rx->sta)
890 rx->sta->rx_packets++;
891 if (is_multicast_ether_addr(hdr->addr1))
892 rx->local->dot11MulticastReceivedFrameCount++;
893 else
894 ieee80211_led_rx(rx->local);
895 return TXRX_CONTINUE;
896}
897
898static ieee80211_txrx_result
899ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
900{
98f0b0a3 901 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
571ecf67
JB
902 struct sk_buff *skb;
903 int no_pending_pkts;
0795af57 904 DECLARE_MAC_BUF(mac);
571ecf67
JB
905
906 if (likely(!rx->sta ||
907 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
908 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
badffb72 909 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
571ecf67
JB
910 return TXRX_CONTINUE;
911
98f0b0a3
RR
912 if ((sdata->type != IEEE80211_IF_TYPE_AP) &&
913 (sdata->type != IEEE80211_IF_TYPE_VLAN))
914 return TXRX_DROP;
915
571ecf67
JB
916 skb = skb_dequeue(&rx->sta->tx_filtered);
917 if (!skb) {
918 skb = skb_dequeue(&rx->sta->ps_tx_buf);
919 if (skb)
920 rx->local->total_ps_buffered--;
921 }
922 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
923 skb_queue_empty(&rx->sta->ps_tx_buf);
924
925 if (skb) {
926 struct ieee80211_hdr *hdr =
927 (struct ieee80211_hdr *) skb->data;
928
929 /* tell TX path to send one frame even though the STA may
930 * still remain is PS mode after this frame exchange */
931 rx->sta->pspoll = 1;
932
933#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57
JP
934 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
935 print_mac(mac, rx->sta->addr), rx->sta->aid,
571ecf67
JB
936 skb_queue_len(&rx->sta->ps_tx_buf));
937#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
938
939 /* Use MoreData flag to indicate whether there are more
940 * buffered frames for this STA */
941 if (no_pending_pkts) {
942 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
943 rx->sta->flags &= ~WLAN_STA_TIM;
944 } else
945 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
946
947 dev_queue_xmit(skb);
948
949 if (no_pending_pkts) {
950 if (rx->local->ops->set_tim)
951 rx->local->ops->set_tim(local_to_hw(rx->local),
952 rx->sta->aid, 0);
953 if (rx->sdata->bss)
954 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
955 }
956#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
957 } else if (!rx->u.rx.sent_ps_buffered) {
0795af57 958 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
571ecf67 959 "though there is no buffered frames for it\n",
0795af57 960 rx->dev->name, print_mac(mac, rx->sta->addr));
571ecf67
JB
961#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
962
963 }
964
965 /* Free PS Poll skb here instead of returning TXRX_DROP that would
966 * count as an dropped frame. */
967 dev_kfree_skb(rx->skb);
968
969 return TXRX_QUEUED;
970}
971
6e0d114d
JB
972static ieee80211_txrx_result
973ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
974{
975 u16 fc = rx->fc;
976 u8 *data = rx->skb->data;
977 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
978
979 if (!WLAN_FC_IS_QOS_DATA(fc))
980 return TXRX_CONTINUE;
981
982 /* remove the qos control field, update frame type and meta-data */
983 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
984 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
985 /* change frame type to non QOS */
986 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
987 hdr->frame_control = cpu_to_le16(fc);
988
989 return TXRX_CONTINUE;
990}
991
76ee65bf
RR
992static int
993ieee80211_drop_802_1x_pae(struct ieee80211_txrx_data *rx, int hdrlen)
571ecf67 994{
76ee65bf 995 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb, hdrlen) &&
badffb72 996 rx->sdata->type != IEEE80211_IF_TYPE_STA &&
f9d540ee 997 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
76ee65bf 998 return 0;
571ecf67
JB
999
1000 if (unlikely(rx->sdata->ieee802_1x &&
1001 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1002 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1003 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
76ee65bf 1004 !ieee80211_is_eapol(rx->skb, hdrlen))) {
571ecf67 1005#ifdef CONFIG_MAC80211_DEBUG
76ee65bf
RR
1006 printk(KERN_DEBUG "%s: dropped frame "
1007 "(unauthorized port)\n", rx->dev->name);
571ecf67 1008#endif /* CONFIG_MAC80211_DEBUG */
76ee65bf 1009 return -EACCES;
571ecf67
JB
1010 }
1011
76ee65bf 1012 return 0;
571ecf67
JB
1013}
1014
76ee65bf
RR
1015static int
1016ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx, int hdrlen)
571ecf67 1017{
3017b80b 1018 /*
7848ba7d
JB
1019 * Pass through unencrypted frames if the hardware has
1020 * decrypted them already.
3017b80b 1021 */
7848ba7d 1022 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1023 return 0;
571ecf67
JB
1024
1025 /* Drop unencrypted frames if key is set. */
1026 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1027 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1028 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
8312512e 1029 (rx->key || rx->sdata->drop_unencrypted) &&
76ee65bf
RR
1030 (rx->sdata->eapol == 0 ||
1031 !ieee80211_is_eapol(rx->skb, hdrlen)))) {
1a84f3fd
JB
1032 if (net_ratelimit())
1033 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
1034 "encryption\n", rx->dev->name);
76ee65bf 1035 return -EACCES;
571ecf67 1036 }
76ee65bf 1037 return 0;
571ecf67
JB
1038}
1039
76ee65bf
RR
1040static int
1041ieee80211_data_to_8023(struct ieee80211_txrx_data *rx)
571ecf67
JB
1042{
1043 struct net_device *dev = rx->dev;
571ecf67
JB
1044 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1045 u16 fc, hdrlen, ethertype;
1046 u8 *payload;
1047 u8 dst[ETH_ALEN];
1048 u8 src[ETH_ALEN];
76ee65bf 1049 struct sk_buff *skb = rx->skb;
571ecf67 1050 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
0795af57
JP
1051 DECLARE_MAC_BUF(mac);
1052 DECLARE_MAC_BUF(mac2);
1053 DECLARE_MAC_BUF(mac3);
1054 DECLARE_MAC_BUF(mac4);
571ecf67
JB
1055
1056 fc = rx->fc;
571ecf67
JB
1057
1058 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
76ee65bf 1059 return -1;
571ecf67
JB
1060
1061 hdrlen = ieee80211_get_hdrlen(fc);
1062
1063 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1064 * header
1065 * IEEE 802.11 address fields:
1066 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1067 * 0 0 DA SA BSSID n/a
1068 * 0 1 DA BSSID SA n/a
1069 * 1 0 BSSID SA DA n/a
1070 * 1 1 RA TA DA SA
1071 */
1072
1073 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1074 case IEEE80211_FCTL_TODS:
1075 /* BSSID SA DA */
1076 memcpy(dst, hdr->addr3, ETH_ALEN);
1077 memcpy(src, hdr->addr2, ETH_ALEN);
1078
1079 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
1080 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
1a84f3fd
JB
1081 if (net_ratelimit())
1082 printk(KERN_DEBUG "%s: dropped ToDS frame "
0795af57 1083 "(BSSID=%s SA=%s DA=%s)\n",
1a84f3fd 1084 dev->name,
0795af57
JP
1085 print_mac(mac, hdr->addr1),
1086 print_mac(mac2, hdr->addr2),
1087 print_mac(mac3, hdr->addr3));
76ee65bf 1088 return -1;
571ecf67
JB
1089 }
1090 break;
1091 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1092 /* RA TA DA SA */
1093 memcpy(dst, hdr->addr3, ETH_ALEN);
1094 memcpy(src, hdr->addr4, ETH_ALEN);
1095
1096 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
1a84f3fd
JB
1097 if (net_ratelimit())
1098 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
0795af57 1099 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1a84f3fd 1100 rx->dev->name,
0795af57
JP
1101 print_mac(mac, hdr->addr1),
1102 print_mac(mac2, hdr->addr2),
1103 print_mac(mac3, hdr->addr3),
1104 print_mac(mac4, hdr->addr4));
76ee65bf 1105 return -1;
571ecf67
JB
1106 }
1107 break;
1108 case IEEE80211_FCTL_FROMDS:
1109 /* DA BSSID SA */
1110 memcpy(dst, hdr->addr1, ETH_ALEN);
1111 memcpy(src, hdr->addr3, ETH_ALEN);
1112
b3316157
JL
1113 if (sdata->type != IEEE80211_IF_TYPE_STA ||
1114 (is_multicast_ether_addr(dst) &&
1115 !compare_ether_addr(src, dev->dev_addr)))
76ee65bf 1116 return -1;
571ecf67
JB
1117 break;
1118 case 0:
1119 /* DA SA BSSID */
1120 memcpy(dst, hdr->addr1, ETH_ALEN);
1121 memcpy(src, hdr->addr2, ETH_ALEN);
1122
1123 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1124 if (net_ratelimit()) {
0795af57
JP
1125 printk(KERN_DEBUG "%s: dropped IBSS frame "
1126 "(DA=%s SA=%s BSSID=%s)\n",
1127 dev->name,
1128 print_mac(mac, hdr->addr1),
1129 print_mac(mac2, hdr->addr2),
1130 print_mac(mac3, hdr->addr3));
571ecf67 1131 }
76ee65bf 1132 return -1;
571ecf67
JB
1133 }
1134 break;
1135 }
1136
571ecf67
JB
1137 if (unlikely(skb->len - hdrlen < 8)) {
1138 if (net_ratelimit()) {
1139 printk(KERN_DEBUG "%s: RX too short data frame "
1140 "payload\n", dev->name);
1141 }
76ee65bf 1142 return -1;
571ecf67
JB
1143 }
1144
76ee65bf 1145 payload = skb->data + hdrlen;
571ecf67
JB
1146 ethertype = (payload[6] << 8) | payload[7];
1147
1148 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1149 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1150 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1151 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1152 * replace EtherType */
1153 skb_pull(skb, hdrlen + 6);
1154 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1155 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1156 } else {
1157 struct ethhdr *ehdr;
1158 __be16 len;
1159 skb_pull(skb, hdrlen);
1160 len = htons(skb->len);
1161 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1162 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1163 memcpy(ehdr->h_source, src, ETH_ALEN);
1164 ehdr->h_proto = len;
1165 }
76ee65bf
RR
1166 return 0;
1167}
571ecf67 1168
76ee65bf
RR
1169static void
1170ieee80211_deliver_skb(struct ieee80211_txrx_data *rx)
1171{
1172 struct net_device *dev = rx->dev;
1173 struct ieee80211_local *local = rx->local;
1174 struct sk_buff *skb, *xmit_skb;
1175 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
571ecf67 1176
76ee65bf
RR
1177 skb = rx->skb;
1178 xmit_skb = NULL;
571ecf67
JB
1179
1180 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
badffb72
JS
1181 || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1182 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
571ecf67
JB
1183 if (is_multicast_ether_addr(skb->data)) {
1184 /* send multicast frames both to higher layers in
1185 * local net stack and back to the wireless media */
76ee65bf
RR
1186 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1187 if (!xmit_skb && net_ratelimit())
571ecf67
JB
1188 printk(KERN_DEBUG "%s: failed to clone "
1189 "multicast frame\n", dev->name);
1190 } else {
1191 struct sta_info *dsta;
1192 dsta = sta_info_get(local, skb->data);
1193 if (dsta && !dsta->dev) {
1a84f3fd
JB
1194 if (net_ratelimit())
1195 printk(KERN_DEBUG "Station with null "
1196 "dev structure!\n");
571ecf67
JB
1197 } else if (dsta && dsta->dev == dev) {
1198 /* Destination station is associated to this
1199 * AP, so send the frame directly to it and
1200 * do not pass the frame to local net stack.
1201 */
76ee65bf 1202 xmit_skb = skb;
571ecf67
JB
1203 skb = NULL;
1204 }
1205 if (dsta)
1206 sta_info_put(dsta);
1207 }
1208 }
1209
1210 if (skb) {
1211 /* deliver to local stack */
1212 skb->protocol = eth_type_trans(skb, dev);
1213 memset(skb->cb, 0, sizeof(skb->cb));
1214 netif_rx(skb);
1215 }
1216
76ee65bf 1217 if (xmit_skb) {
571ecf67 1218 /* send to wireless media */
f831e909 1219 xmit_skb->protocol = htons(ETH_P_802_3);
76ee65bf
RR
1220 skb_set_network_header(xmit_skb, 0);
1221 skb_set_mac_header(xmit_skb, 0);
1222 dev_queue_xmit(xmit_skb);
571ecf67 1223 }
76ee65bf
RR
1224}
1225
fd4c7f2f
RR
1226static ieee80211_txrx_result
1227ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
1228{
1229 struct net_device *dev = rx->dev;
1230 struct ieee80211_local *local = rx->local;
1231 u16 fc, ethertype;
1232 u8 *payload;
1233 struct sk_buff *skb = rx->skb, *frame = NULL;
1234 const struct ethhdr *eth;
1235 int remaining, err;
1236 u8 dst[ETH_ALEN];
1237 u8 src[ETH_ALEN];
1238 DECLARE_MAC_BUF(mac);
1239
1240 fc = rx->fc;
1241 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1242 return TXRX_CONTINUE;
1243
1244 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1245 return TXRX_DROP;
1246
64bd4b69 1247 if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU))
fd4c7f2f
RR
1248 return TXRX_CONTINUE;
1249
1250 err = ieee80211_data_to_8023(rx);
1251 if (unlikely(err))
1252 return TXRX_DROP;
1253
1254 skb->dev = dev;
1255
1256 dev->stats.rx_packets++;
1257 dev->stats.rx_bytes += skb->len;
1258
1259 /* skip the wrapping header */
1260 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1261 if (!eth)
1262 return TXRX_DROP;
1263
1264 while (skb != frame) {
1265 u8 padding;
1266 __be16 len = eth->h_proto;
1267 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1268
1269 remaining = skb->len;
1270 memcpy(dst, eth->h_dest, ETH_ALEN);
1271 memcpy(src, eth->h_source, ETH_ALEN);
1272
1273 padding = ((4 - subframe_len) & 0x3);
1274 /* the last MSDU has no padding */
1275 if (subframe_len > remaining) {
1276 printk(KERN_DEBUG "%s: wrong buffer size", dev->name);
1277 return TXRX_DROP;
1278 }
1279
1280 skb_pull(skb, sizeof(struct ethhdr));
1281 /* if last subframe reuse skb */
1282 if (remaining <= subframe_len + padding)
1283 frame = skb;
1284 else {
1285 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1286 subframe_len);
1287
1288 if (frame == NULL)
1289 return TXRX_DROP;
1290
1291 skb_reserve(frame, local->hw.extra_tx_headroom +
1292 sizeof(struct ethhdr));
1293 memcpy(skb_put(frame, ntohs(len)), skb->data,
1294 ntohs(len));
1295
1296 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1297 padding);
1298 if (!eth) {
1299 printk(KERN_DEBUG "%s: wrong buffer size ",
1300 dev->name);
1301 dev_kfree_skb(frame);
1302 return TXRX_DROP;
1303 }
1304 }
1305
1306 skb_set_network_header(frame, 0);
1307 frame->dev = dev;
1308 frame->priority = skb->priority;
1309 rx->skb = frame;
1310
1311 if ((ieee80211_drop_802_1x_pae(rx, 0)) ||
1312 (ieee80211_drop_unencrypted(rx, 0))) {
1313 if (skb == frame) /* last frame */
1314 return TXRX_DROP;
1315 dev_kfree_skb(frame);
1316 continue;
1317 }
1318
1319 payload = frame->data;
1320 ethertype = (payload[6] << 8) | payload[7];
1321
1322 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1323 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1324 compare_ether_addr(payload,
1325 bridge_tunnel_header) == 0)) {
1326 /* remove RFC1042 or Bridge-Tunnel
1327 * encapsulation and replace EtherType */
1328 skb_pull(frame, 6);
1329 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1330 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1331 } else {
1332 memcpy(skb_push(frame, sizeof(__be16)), &len,
1333 sizeof(__be16));
1334 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1335 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1336 }
1337
1338
1339 ieee80211_deliver_skb(rx);
1340 }
1341
1342 return TXRX_QUEUED;
1343}
1344
76ee65bf
RR
1345static ieee80211_txrx_result
1346ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
1347{
1348 struct net_device *dev = rx->dev;
1349 u16 fc;
1350 int err, hdrlen;
1351
1352 fc = rx->fc;
1353 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1354 return TXRX_CONTINUE;
1355
1356 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1357 return TXRX_DROP;
1358
1359 hdrlen = ieee80211_get_hdrlen(fc);
1360
1361 if ((ieee80211_drop_802_1x_pae(rx, hdrlen)) ||
1362 (ieee80211_drop_unencrypted(rx, hdrlen)))
1363 return TXRX_DROP;
1364
1365 err = ieee80211_data_to_8023(rx);
1366 if (unlikely(err))
1367 return TXRX_DROP;
1368
1369 rx->skb->dev = dev;
1370
1371 dev->stats.rx_packets++;
1372 dev->stats.rx_bytes += rx->skb->len;
1373
1374 ieee80211_deliver_skb(rx);
571ecf67
JB
1375
1376 return TXRX_QUEUED;
1377}
1378
1379static ieee80211_txrx_result
1380ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1381{
1382 struct ieee80211_sub_if_data *sdata;
1383
badffb72 1384 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
571ecf67
JB
1385 return TXRX_DROP;
1386
1387 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1388 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1389 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
ddd3d2be 1390 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
571ecf67 1391 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
f9d540ee
JB
1392 else
1393 return TXRX_DROP;
1394
571ecf67
JB
1395 return TXRX_QUEUED;
1396}
1397
1398static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1399 struct ieee80211_local *local,
1400 ieee80211_rx_handler *handlers,
1401 struct ieee80211_txrx_data *rx,
1402 struct sta_info *sta)
1403{
1404 ieee80211_rx_handler *handler;
1405 ieee80211_txrx_result res = TXRX_DROP;
1406
1407 for (handler = handlers; *handler != NULL; handler++) {
1408 res = (*handler)(rx);
8e6f0032
JB
1409
1410 switch (res) {
1411 case TXRX_CONTINUE:
1412 continue;
1413 case TXRX_DROP:
1414 I802_DEBUG_INC(local->rx_handlers_drop);
1415 if (sta)
1416 sta->rx_dropped++;
1417 break;
1418 case TXRX_QUEUED:
1419 I802_DEBUG_INC(local->rx_handlers_queued);
571ecf67
JB
1420 break;
1421 }
8e6f0032 1422 break;
571ecf67
JB
1423 }
1424
8e6f0032 1425 if (res == TXRX_DROP)
571ecf67 1426 dev_kfree_skb(rx->skb);
571ecf67
JB
1427 return res;
1428}
1429
1430static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1431 ieee80211_rx_handler *handlers,
1432 struct ieee80211_txrx_data *rx,
1433 struct sta_info *sta)
1434{
1435 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1436 TXRX_CONTINUE)
1437 dev_kfree_skb(rx->skb);
1438}
1439
1440static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1441 struct ieee80211_hdr *hdr,
1442 struct sta_info *sta,
1443 struct ieee80211_txrx_data *rx)
1444{
1445 int keyidx, hdrlen;
0795af57
JP
1446 DECLARE_MAC_BUF(mac);
1447 DECLARE_MAC_BUF(mac2);
571ecf67
JB
1448
1449 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1450 if (rx->skb->len >= hdrlen + 4)
1451 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1452 else
1453 keyidx = -1;
1454
1a84f3fd
JB
1455 if (net_ratelimit())
1456 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
0795af57
JP
1457 "failure from %s to %s keyidx=%d\n",
1458 dev->name, print_mac(mac, hdr->addr2),
1459 print_mac(mac2, hdr->addr1), keyidx);
571ecf67
JB
1460
1461 if (!sta) {
aa0daf0e
JB
1462 /*
1463 * Some hardware seem to generate incorrect Michael MIC
1464 * reports; ignore them to avoid triggering countermeasures.
1465 */
1a84f3fd
JB
1466 if (net_ratelimit())
1467 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
0795af57
JP
1468 "error for unknown address %s\n",
1469 dev->name, print_mac(mac, hdr->addr2));
571ecf67
JB
1470 goto ignore;
1471 }
1472
1473 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1a84f3fd
JB
1474 if (net_ratelimit())
1475 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
aa0daf0e 1476 "error for a frame with no PROTECTED flag (src "
0795af57 1477 "%s)\n", dev->name, print_mac(mac, hdr->addr2));
571ecf67
JB
1478 goto ignore;
1479 }
1480
7848ba7d 1481 if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
aa0daf0e
JB
1482 /*
1483 * APs with pairwise keys should never receive Michael MIC
1484 * errors for non-zero keyidx because these are reserved for
1485 * group keys and only the AP is sending real multicast
1486 * frames in the BSS.
1487 */
eb063c17
JB
1488 if (net_ratelimit())
1489 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1490 "a frame with non-zero keyidx (%d)"
0795af57
JP
1491 " (src %s)\n", dev->name, keyidx,
1492 print_mac(mac, hdr->addr2));
eb063c17 1493 goto ignore;
571ecf67
JB
1494 }
1495
1496 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1497 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1498 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1a84f3fd
JB
1499 if (net_ratelimit())
1500 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1501 "error for a frame that cannot be encrypted "
0795af57
JP
1502 "(fc=0x%04x) (src %s)\n",
1503 dev->name, rx->fc, print_mac(mac, hdr->addr2));
571ecf67
JB
1504 goto ignore;
1505 }
1506
eb063c17 1507 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
571ecf67
JB
1508 ignore:
1509 dev_kfree_skb(rx->skb);
1510 rx->skb = NULL;
1511}
1512
1513ieee80211_rx_handler ieee80211_rx_handlers[] =
1514{
1515 ieee80211_rx_h_if_stats,
571ecf67
JB
1516 ieee80211_rx_h_passive_scan,
1517 ieee80211_rx_h_check,
4f0d18e2 1518 ieee80211_rx_h_decrypt,
70f08765 1519 ieee80211_rx_h_sta_process,
571ecf67
JB
1520 ieee80211_rx_h_defragment,
1521 ieee80211_rx_h_ps_poll,
1522 ieee80211_rx_h_michael_mic_verify,
1523 /* this must be after decryption - so header is counted in MPDU mic
1524 * must be before pae and data, so QOS_DATA format frames
1525 * are not passed to user space by these functions
1526 */
1527 ieee80211_rx_h_remove_qos_control,
fd4c7f2f 1528 ieee80211_rx_h_amsdu,
571ecf67
JB
1529 ieee80211_rx_h_data,
1530 ieee80211_rx_h_mgmt,
1531 NULL
1532};
1533
1534/* main receive path */
1535
23a24def
JB
1536static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1537 u8 *bssid, struct ieee80211_txrx_data *rx,
1538 struct ieee80211_hdr *hdr)
1539{
1540 int multicast = is_multicast_ether_addr(hdr->addr1);
1541
1542 switch (sdata->type) {
1543 case IEEE80211_IF_TYPE_STA:
1544 if (!bssid)
1545 return 0;
1546 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
badffb72 1547 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def 1548 return 0;
badffb72 1549 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB
1550 } else if (!multicast &&
1551 compare_ether_addr(sdata->dev->dev_addr,
1552 hdr->addr1) != 0) {
4150c572 1553 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 1554 return 0;
badffb72 1555 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB
1556 }
1557 break;
1558 case IEEE80211_IF_TYPE_IBSS:
1559 if (!bssid)
1560 return 0;
1561 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
badffb72 1562 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def 1563 return 0;
badffb72 1564 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB
1565 } else if (!multicast &&
1566 compare_ether_addr(sdata->dev->dev_addr,
1567 hdr->addr1) != 0) {
4150c572 1568 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 1569 return 0;
badffb72 1570 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB
1571 } else if (!rx->sta)
1572 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1573 bssid, hdr->addr2);
1574 break;
fb1c1cd6 1575 case IEEE80211_IF_TYPE_VLAN:
23a24def
JB
1576 case IEEE80211_IF_TYPE_AP:
1577 if (!bssid) {
1578 if (compare_ether_addr(sdata->dev->dev_addr,
1579 hdr->addr1))
1580 return 0;
1581 } else if (!ieee80211_bssid_match(bssid,
1582 sdata->dev->dev_addr)) {
badffb72 1583 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def 1584 return 0;
badffb72 1585 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def 1586 }
badffb72
JS
1587 if (sdata->dev == sdata->local->mdev &&
1588 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def
JB
1589 /* do not receive anything via
1590 * master device when not scanning */
1591 return 0;
1592 break;
1593 case IEEE80211_IF_TYPE_WDS:
1594 if (bssid ||
1595 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1596 return 0;
1597 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1598 return 0;
1599 break;
fb1c1cd6
JB
1600 case IEEE80211_IF_TYPE_MNTR:
1601 /* take everything */
1602 break;
a2897552 1603 case IEEE80211_IF_TYPE_INVALID:
fb1c1cd6
JB
1604 /* should never get here */
1605 WARN_ON(1);
1606 break;
23a24def
JB
1607 }
1608
1609 return 1;
1610}
1611
571ecf67
JB
1612/*
1613 * This is the receive path handler. It is called by a low level driver when an
1614 * 802.11 MPDU is received from the hardware.
1615 */
1616void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1617 struct ieee80211_rx_status *status)
1618{
1619 struct ieee80211_local *local = hw_to_local(hw);
1620 struct ieee80211_sub_if_data *sdata;
1621 struct sta_info *sta;
1622 struct ieee80211_hdr *hdr;
1623 struct ieee80211_txrx_data rx;
1624 u16 type;
b2e7771e 1625 int prepres;
8e6f0032
JB
1626 struct ieee80211_sub_if_data *prev = NULL;
1627 struct sk_buff *skb_new;
1628 u8 *bssid;
d10f2150 1629 int hdrlen;
571ecf67 1630
d4e46a3d 1631 /*
79010420
JB
1632 * key references and virtual interfaces are protected using RCU
1633 * and this requires that we are in a read-side RCU section during
1634 * receive processing
d4e46a3d
JB
1635 */
1636 rcu_read_lock();
1637
b2e7771e
JB
1638 /*
1639 * Frames with failed FCS/PLCP checksum are not returned,
1640 * all other frames are returned without radiotap header
1641 * if it was previously present.
1642 * Also, frames with less than 16 bytes are dropped.
1643 */
1644 skb = ieee80211_rx_monitor(local, skb, status);
1645 if (!skb) {
1646 rcu_read_unlock();
1647 return;
1648 }
1649
571ecf67
JB
1650 hdr = (struct ieee80211_hdr *) skb->data;
1651 memset(&rx, 0, sizeof(rx));
1652 rx.skb = skb;
1653 rx.local = local;
1654
1655 rx.u.rx.status = status;
b2e7771e 1656 rx.fc = le16_to_cpu(hdr->frame_control);
571ecf67 1657 type = rx.fc & IEEE80211_FCTL_FTYPE;
72abd81b 1658
d10f2150
DM
1659 /*
1660 * Drivers are required to align the payload data to a four-byte
1661 * boundary, so the last two bits of the address where it starts
1662 * may not be set. The header is required to be directly before
1663 * the payload data, padding like atheros hardware adds which is
1664 * inbetween the 802.11 header and the payload is not supported,
1665 * the driver is required to move the 802.11 header further back
1666 * in that case.
1667 */
1668 hdrlen = ieee80211_get_hdrlen(rx.fc);
1669 WARN_ON_ONCE(((unsigned long)(skb->data + hdrlen)) & 3);
1670
b2e7771e 1671 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
571ecf67 1672 local->dot11ReceivedFragmentCount++;
571ecf67 1673
b2e7771e
JB
1674 sta = rx.sta = sta_info_get(local, hdr->addr2);
1675 if (sta) {
1676 rx.dev = rx.sta->dev;
1677 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1678 }
571ecf67 1679
571ecf67
JB
1680 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1681 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1682 goto end;
1683 }
1684
ece8eddd 1685 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
badffb72 1686 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
571ecf67
JB
1687
1688 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1689 sta) != TXRX_CONTINUE)
1690 goto end;
1691 skb = rx.skb;
1692
c9ee23df 1693 if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
53918994
JB
1694 !atomic_read(&local->iff_promiscs) &&
1695 !is_multicast_ether_addr(hdr->addr1)) {
badffb72 1696 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
571ecf67 1697 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
23a24def 1698 rx.sta);
8e6f0032 1699 sta_info_put(sta);
d4e46a3d 1700 rcu_read_unlock();
8e6f0032
JB
1701 return;
1702 }
1703
b2e7771e 1704 bssid = ieee80211_get_bssid(hdr, skb->len);
8e6f0032 1705
79010420 1706 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2a8a9a88
JB
1707 if (!netif_running(sdata->dev))
1708 continue;
1709
b2e7771e
JB
1710 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
1711 continue;
1712
1713 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB
1714 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1715 /* prepare_for_handlers can change sta */
1716 sta = rx.sta;
1717
1718 if (!prepres)
1719 continue;
8e6f0032 1720
340e11f3
JB
1721 /*
1722 * frame is destined for this interface, but if it's not
1723 * also for the previous one we handle that after the
1724 * loop to avoid copying the SKB once too much
1725 */
1726
1727 if (!prev) {
1728 prev = sdata;
1729 continue;
8e6f0032 1730 }
340e11f3
JB
1731
1732 /*
1733 * frame was destined for the previous interface
1734 * so invoke RX handlers for it
1735 */
1736
1737 skb_new = skb_copy(skb, GFP_ATOMIC);
1738 if (!skb_new) {
1739 if (net_ratelimit())
1740 printk(KERN_DEBUG "%s: failed to copy "
1741 "multicast frame for %s",
dd1cd4c6
JB
1742 wiphy_name(local->hw.wiphy),
1743 prev->dev->name);
340e11f3
JB
1744 continue;
1745 }
1746 rx.skb = skb_new;
1747 rx.dev = prev->dev;
1748 rx.sdata = prev;
1749 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1750 &rx, sta);
8e6f0032 1751 prev = sdata;
571ecf67 1752 }
8e6f0032
JB
1753 if (prev) {
1754 rx.skb = skb;
1755 rx.dev = prev->dev;
1756 rx.sdata = prev;
1757 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1758 &rx, sta);
1759 } else
1760 dev_kfree_skb(skb);
571ecf67 1761
8e6f0032 1762 end:
d4e46a3d
JB
1763 rcu_read_unlock();
1764
571ecf67
JB
1765 if (sta)
1766 sta_info_put(sta);
1767}
1768EXPORT_SYMBOL(__ieee80211_rx);
1769
1770/* This is a version of the rx handler that can be called from hard irq
1771 * context. Post the skb on the queue and schedule the tasklet */
1772void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1773 struct ieee80211_rx_status *status)
1774{
1775 struct ieee80211_local *local = hw_to_local(hw);
1776
1777 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1778
1779 skb->dev = local->mdev;
1780 /* copy status into skb->cb for use by tasklet */
1781 memcpy(skb->cb, status, sizeof(*status));
1782 skb->pkt_type = IEEE80211_RX_MSG;
1783 skb_queue_tail(&local->skb_queue, skb);
1784 tasklet_schedule(&local->tasklet);
1785}
1786EXPORT_SYMBOL(ieee80211_rx_irqsafe);