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mac80211: rx.c use new frame control helpers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / rx.c
blob8962d1355f04b0b7bfc030bef0b7f9b7c9edbf9e
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/jiffies.h>
13 #include <linux/kernel.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rcupdate.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20
21 #include "ieee80211_i.h"
22 #include "led.h"
23 #include "mesh.h"
24 #include "wep.h"
25 #include "wpa.h"
26 #include "tkip.h"
27 #include "wme.h"
28
29 u8 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);
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 */
39 static 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
59 static 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 {
64 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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;
70 if (ieee80211_is_ctl(hdr->frame_control) &&
71 !ieee80211_is_pspoll(hdr->frame_control) &&
72 !ieee80211_is_back_req(hdr->frame_control))
73 return 1;
74 return 0;
75 }
76
77 static int
78 ieee80211_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 */
109 static void
110 ieee80211_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;
146 pos++;
147
148 /* IEEE80211_RADIOTAP_RATE */
149 *pos = rate->bitrate / 5;
150 pos++;
151
152 /* IEEE80211_RADIOTAP_CHANNEL */
153 *(__le16 *)pos = cpu_to_le16(status->freq);
154 pos += 2;
155 if (status->band == IEEE80211_BAND_5GHZ)
156 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
157 IEEE80211_CHAN_5GHZ);
158 else
159 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN |
160 IEEE80211_CHAN_2GHZ);
161 pos += 2;
162
163 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
164 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
165 *pos = status->signal;
166 rthdr->it_present |=
167 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
168 pos++;
169 }
170
171 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
172 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
173 *pos = status->noise;
174 rthdr->it_present |=
175 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
176 pos++;
177 }
178
179 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
180
181 /* IEEE80211_RADIOTAP_ANTENNA */
182 *pos = status->antenna;
183 pos++;
184
185 /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
186 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
187 *pos = status->signal;
188 rthdr->it_present |=
189 cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
190 pos++;
191 }
192
193 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
194
195 /* IEEE80211_RADIOTAP_RX_FLAGS */
196 /* ensure 2 byte alignment for the 2 byte field as required */
197 if ((pos - (unsigned char *)rthdr) & 1)
198 pos++;
199 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
200 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
201 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
202 pos += 2;
203 }
204
205 /*
206 * This function copies a received frame to all monitor interfaces and
207 * returns a cleaned-up SKB that no longer includes the FCS nor the
208 * radiotap header the driver might have added.
209 */
210 static struct sk_buff *
211 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
212 struct ieee80211_rx_status *status,
213 struct ieee80211_rate *rate)
214 {
215 struct ieee80211_sub_if_data *sdata;
216 int needed_headroom = 0;
217 struct sk_buff *skb, *skb2;
218 struct net_device *prev_dev = NULL;
219 int present_fcs_len = 0;
220 int rtap_len = 0;
221
222 /*
223 * First, we may need to make a copy of the skb because
224 * (1) we need to modify it for radiotap (if not present), and
225 * (2) the other RX handlers will modify the skb we got.
226 *
227 * We don't need to, of course, if we aren't going to return
228 * the SKB because it has a bad FCS/PLCP checksum.
229 */
230 if (status->flag & RX_FLAG_RADIOTAP)
231 rtap_len = ieee80211_get_radiotap_len(origskb->data);
232 else
233 /* room for the radiotap header based on driver features */
234 needed_headroom = ieee80211_rx_radiotap_len(local, status);
235
236 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
237 present_fcs_len = FCS_LEN;
238
239 if (!local->monitors) {
240 if (should_drop_frame(status, origskb, present_fcs_len,
241 rtap_len)) {
242 dev_kfree_skb(origskb);
243 return NULL;
244 }
245
246 return remove_monitor_info(local, origskb, rtap_len);
247 }
248
249 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
250 /* only need to expand headroom if necessary */
251 skb = origskb;
252 origskb = NULL;
253
254 /*
255 * This shouldn't trigger often because most devices have an
256 * RX header they pull before we get here, and that should
257 * be big enough for our radiotap information. We should
258 * probably export the length to drivers so that we can have
259 * them allocate enough headroom to start with.
260 */
261 if (skb_headroom(skb) < needed_headroom &&
262 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
263 dev_kfree_skb(skb);
264 return NULL;
265 }
266 } else {
267 /*
268 * Need to make a copy and possibly remove radiotap header
269 * and FCS from the original.
270 */
271 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
272
273 origskb = remove_monitor_info(local, origskb, rtap_len);
274
275 if (!skb)
276 return origskb;
277 }
278
279 /* if necessary, prepend radiotap information */
280 if (!(status->flag & RX_FLAG_RADIOTAP))
281 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
282 needed_headroom);
283
284 skb_reset_mac_header(skb);
285 skb->ip_summed = CHECKSUM_UNNECESSARY;
286 skb->pkt_type = PACKET_OTHERHOST;
287 skb->protocol = htons(ETH_P_802_2);
288
289 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
290 if (!netif_running(sdata->dev))
291 continue;
292
293 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
294 continue;
295
296 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
297 continue;
298
299 if (prev_dev) {
300 skb2 = skb_clone(skb, GFP_ATOMIC);
301 if (skb2) {
302 skb2->dev = prev_dev;
303 netif_rx(skb2);
304 }
305 }
306
307 prev_dev = sdata->dev;
308 sdata->dev->stats.rx_packets++;
309 sdata->dev->stats.rx_bytes += skb->len;
310 }
311
312 if (prev_dev) {
313 skb->dev = prev_dev;
314 netif_rx(skb);
315 } else
316 dev_kfree_skb(skb);
317
318 return origskb;
319 }
320
321
322 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
323 {
324 u8 *data = rx->skb->data;
325 int tid;
326
327 /* does the frame have a qos control field? */
328 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
329 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
330 /* frame has qos control */
331 tid = qc[0] & QOS_CONTROL_TID_MASK;
332 if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
333 rx->flags |= IEEE80211_RX_AMSDU;
334 else
335 rx->flags &= ~IEEE80211_RX_AMSDU;
336 } else {
337 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
338 /* Separate TID for management frames */
339 tid = NUM_RX_DATA_QUEUES - 1;
340 } else {
341 /* no qos control present */
342 tid = 0; /* 802.1d - Best Effort */
343 }
344 }
345
346 rx->queue = tid;
347 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
348 * For now, set skb->priority to 0 for other cases. */
349 rx->skb->priority = (tid > 7) ? 0 : tid;
350 }
351
352 static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
353 {
354 #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
355 int hdrlen;
356
357 if (!WLAN_FC_DATA_PRESENT(rx->fc))
358 return;
359
360 /*
361 * Drivers are required to align the payload data in a way that
362 * guarantees that the contained IP header is aligned to a four-
363 * byte boundary. In the case of regular frames, this simply means
364 * aligning the payload to a four-byte boundary (because either
365 * the IP header is directly contained, or IV/RFC1042 headers that
366 * have a length divisible by four are in front of it.
367 *
368 * With A-MSDU frames, however, the payload data address must
369 * yield two modulo four because there are 14-byte 802.3 headers
370 * within the A-MSDU frames that push the IP header further back
371 * to a multiple of four again. Thankfully, the specs were sane
372 * enough this time around to require padding each A-MSDU subframe
373 * to a length that is a multiple of four.
374 *
375 * Padding like atheros hardware adds which is inbetween the 802.11
376 * header and the payload is not supported, the driver is required
377 * to move the 802.11 header further back in that case.
378 */
379 hdrlen = ieee80211_get_hdrlen(rx->fc);
380 if (rx->flags & IEEE80211_RX_AMSDU)
381 hdrlen += ETH_HLEN;
382 WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
383 #endif
384 }
385
386
387 /* rx handlers */
388
389 static ieee80211_rx_result
390 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
391 {
392 struct ieee80211_local *local = rx->local;
393 struct sk_buff *skb = rx->skb;
394
395 if (unlikely(local->sta_hw_scanning))
396 return ieee80211_sta_rx_scan(rx->dev, skb, rx->status);
397
398 if (unlikely(local->sta_sw_scanning)) {
399 /* drop all the other packets during a software scan anyway */
400 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status)
401 != RX_QUEUED)
402 dev_kfree_skb(skb);
403 return RX_QUEUED;
404 }
405
406 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
407 /* scanning finished during invoking of handlers */
408 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
409 return RX_DROP_UNUSABLE;
410 }
411
412 return RX_CONTINUE;
413 }
414
415 static ieee80211_rx_result
416 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
417 {
418 int hdrlen = ieee80211_get_hdrlen(rx->fc);
419 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
420
421 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
422
423 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) {
424 if (!((rx->fc & IEEE80211_FCTL_FROMDS) &&
425 (rx->fc & IEEE80211_FCTL_TODS)))
426 return RX_DROP_MONITOR;
427 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
428 return RX_DROP_MONITOR;
429 }
430
431 /* If there is not an established peer link and this is not a peer link
432 * establisment frame, beacon or probe, drop the frame.
433 */
434
435 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
436 struct ieee80211_mgmt *mgmt;
437
438 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
439 return RX_DROP_MONITOR;
440
441 switch (rx->fc & IEEE80211_FCTL_STYPE) {
442 case IEEE80211_STYPE_ACTION:
443 mgmt = (struct ieee80211_mgmt *)hdr;
444 if (mgmt->u.action.category != PLINK_CATEGORY)
445 return RX_DROP_MONITOR;
446 /* fall through on else */
447 case IEEE80211_STYPE_PROBE_REQ:
448 case IEEE80211_STYPE_PROBE_RESP:
449 case IEEE80211_STYPE_BEACON:
450 return RX_CONTINUE;
451 break;
452 default:
453 return RX_DROP_MONITOR;
454 }
455
456 } else if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
457 is_multicast_ether_addr(hdr->addr1) &&
458 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev))
459 return RX_DROP_MONITOR;
460 #undef msh_h_get
461
462 return RX_CONTINUE;
463 }
464
465
466 static ieee80211_rx_result
467 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
468 {
469 struct ieee80211_hdr *hdr;
470
471 hdr = (struct ieee80211_hdr *) rx->skb->data;
472
473 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
474 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
475 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
476 rx->sta->last_seq_ctrl[rx->queue] ==
477 hdr->seq_ctrl)) {
478 if (rx->flags & IEEE80211_RX_RA_MATCH) {
479 rx->local->dot11FrameDuplicateCount++;
480 rx->sta->num_duplicates++;
481 }
482 return RX_DROP_MONITOR;
483 } else
484 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
485 }
486
487 if (unlikely(rx->skb->len < 16)) {
488 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
489 return RX_DROP_MONITOR;
490 }
491
492 /* Drop disallowed frame classes based on STA auth/assoc state;
493 * IEEE 802.11, Chap 5.5.
494 *
495 * 80211.o does filtering only based on association state, i.e., it
496 * drops Class 3 frames from not associated stations. hostapd sends
497 * deauth/disassoc frames when needed. In addition, hostapd is
498 * responsible for filtering on both auth and assoc states.
499 */
500
501 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
502 return ieee80211_rx_mesh_check(rx);
503
504 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
505 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
506 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
507 rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
508 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
509 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
510 !(rx->fc & IEEE80211_FCTL_TODS) &&
511 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
512 || !(rx->flags & IEEE80211_RX_RA_MATCH)) {
513 /* Drop IBSS frames and frames for other hosts
514 * silently. */
515 return RX_DROP_MONITOR;
516 }
517
518 return RX_DROP_MONITOR;
519 }
520
521 return RX_CONTINUE;
522 }
523
524
525 static ieee80211_rx_result
526 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
527 {
528 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
529 int keyidx;
530 int hdrlen;
531 ieee80211_rx_result result = RX_DROP_UNUSABLE;
532 struct ieee80211_key *stakey = NULL;
533
534 /*
535 * Key selection 101
536 *
537 * There are three types of keys:
538 * - GTK (group keys)
539 * - PTK (pairwise keys)
540 * - STK (station-to-station pairwise keys)
541 *
542 * When selecting a key, we have to distinguish between multicast
543 * (including broadcast) and unicast frames, the latter can only
544 * use PTKs and STKs while the former always use GTKs. Unless, of
545 * course, actual WEP keys ("pre-RSNA") are used, then unicast
546 * frames can also use key indizes like GTKs. Hence, if we don't
547 * have a PTK/STK we check the key index for a WEP key.
548 *
549 * Note that in a regular BSS, multicast frames are sent by the
550 * AP only, associated stations unicast the frame to the AP first
551 * which then multicasts it on their behalf.
552 *
553 * There is also a slight problem in IBSS mode: GTKs are negotiated
554 * with each station, that is something we don't currently handle.
555 * The spec seems to expect that one negotiates the same key with
556 * every station but there's no such requirement; VLANs could be
557 * possible.
558 */
559
560 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
561 return RX_CONTINUE;
562
563 /*
564 * No point in finding a key and decrypting if the frame is neither
565 * addressed to us nor a multicast frame.
566 */
567 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
568 return RX_CONTINUE;
569
570 if (rx->sta)
571 stakey = rcu_dereference(rx->sta->key);
572
573 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
574 rx->key = stakey;
575 } else {
576 /*
577 * The device doesn't give us the IV so we won't be
578 * able to look up the key. That's ok though, we
579 * don't need to decrypt the frame, we just won't
580 * be able to keep statistics accurate.
581 * Except for key threshold notifications, should
582 * we somehow allow the driver to tell us which key
583 * the hardware used if this flag is set?
584 */
585 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
586 (rx->status->flag & RX_FLAG_IV_STRIPPED))
587 return RX_CONTINUE;
588
589 hdrlen = ieee80211_get_hdrlen(rx->fc);
590
591 if (rx->skb->len < 8 + hdrlen)
592 return RX_DROP_UNUSABLE; /* TODO: count this? */
593
594 /*
595 * no need to call ieee80211_wep_get_keyidx,
596 * it verifies a bunch of things we've done already
597 */
598 keyidx = rx->skb->data[hdrlen + 3] >> 6;
599
600 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
601
602 /*
603 * RSNA-protected unicast frames should always be sent with
604 * pairwise or station-to-station keys, but for WEP we allow
605 * using a key index as well.
606 */
607 if (rx->key && rx->key->conf.alg != ALG_WEP &&
608 !is_multicast_ether_addr(hdr->addr1))
609 rx->key = NULL;
610 }
611
612 if (rx->key) {
613 rx->key->tx_rx_count++;
614 /* TODO: add threshold stuff again */
615 } else {
616 #ifdef CONFIG_MAC80211_DEBUG
617 if (net_ratelimit())
618 printk(KERN_DEBUG "%s: RX protected frame,"
619 " but have no key\n", rx->dev->name);
620 #endif /* CONFIG_MAC80211_DEBUG */
621 return RX_DROP_MONITOR;
622 }
623
624 /* Check for weak IVs if possible */
625 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
626 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
627 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
628 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
629 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
630 rx->sta->wep_weak_iv_count++;
631
632 switch (rx->key->conf.alg) {
633 case ALG_WEP:
634 result = ieee80211_crypto_wep_decrypt(rx);
635 break;
636 case ALG_TKIP:
637 result = ieee80211_crypto_tkip_decrypt(rx);
638 break;
639 case ALG_CCMP:
640 result = ieee80211_crypto_ccmp_decrypt(rx);
641 break;
642 }
643
644 /* either the frame has been decrypted or will be dropped */
645 rx->status->flag |= RX_FLAG_DECRYPTED;
646
647 return result;
648 }
649
650 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
651 {
652 struct ieee80211_sub_if_data *sdata;
653 DECLARE_MAC_BUF(mac);
654
655 sdata = sta->sdata;
656
657 if (sdata->bss)
658 atomic_inc(&sdata->bss->num_sta_ps);
659 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
660 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
661 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
662 dev->name, print_mac(mac, sta->addr), sta->aid);
663 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
664 }
665
666 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
667 {
668 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
669 struct sk_buff *skb;
670 int sent = 0;
671 struct ieee80211_sub_if_data *sdata;
672 struct ieee80211_tx_info *info;
673 DECLARE_MAC_BUF(mac);
674
675 sdata = sta->sdata;
676
677 if (sdata->bss)
678 atomic_dec(&sdata->bss->num_sta_ps);
679
680 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
681
682 if (!skb_queue_empty(&sta->ps_tx_buf))
683 sta_info_clear_tim_bit(sta);
684
685 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
686 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
687 dev->name, print_mac(mac, sta->addr), sta->aid);
688 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
689
690 /* Send all buffered frames to the station */
691 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
692 info = IEEE80211_SKB_CB(skb);
693 sent++;
694 info->flags |= IEEE80211_TX_CTL_REQUEUE;
695 dev_queue_xmit(skb);
696 }
697 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
698 info = IEEE80211_SKB_CB(skb);
699 local->total_ps_buffered--;
700 sent++;
701 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
702 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
703 "since STA not sleeping anymore\n", dev->name,
704 print_mac(mac, sta->addr), sta->aid);
705 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
706 info->flags |= IEEE80211_TX_CTL_REQUEUE;
707 dev_queue_xmit(skb);
708 }
709
710 return sent;
711 }
712
713 static ieee80211_rx_result
714 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
715 {
716 struct sta_info *sta = rx->sta;
717 struct net_device *dev = rx->dev;
718 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
719
720 if (!sta)
721 return RX_CONTINUE;
722
723 /* Update last_rx only for IBSS packets which are for the current
724 * BSSID to avoid keeping the current IBSS network alive in cases where
725 * other STAs are using different BSSID. */
726 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
727 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
728 IEEE80211_IF_TYPE_IBSS);
729 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
730 sta->last_rx = jiffies;
731 } else
732 if (!is_multicast_ether_addr(hdr->addr1) ||
733 rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
734 /* Update last_rx only for unicast frames in order to prevent
735 * the Probe Request frames (the only broadcast frames from a
736 * STA in infrastructure mode) from keeping a connection alive.
737 * Mesh beacons will update last_rx when if they are found to
738 * match the current local configuration when processed.
739 */
740 sta->last_rx = jiffies;
741 }
742
743 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
744 return RX_CONTINUE;
745
746 sta->rx_fragments++;
747 sta->rx_bytes += rx->skb->len;
748 sta->last_signal = rx->status->signal;
749 sta->last_qual = rx->status->qual;
750 sta->last_noise = rx->status->noise;
751
752 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
753 /* Change STA power saving mode only in the end of a frame
754 * exchange sequence */
755 if (test_sta_flags(sta, WLAN_STA_PS) &&
756 !(rx->fc & IEEE80211_FCTL_PM))
757 rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
758 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
759 (rx->fc & IEEE80211_FCTL_PM))
760 ap_sta_ps_start(dev, sta);
761 }
762
763 /* Drop data::nullfunc frames silently, since they are used only to
764 * control station power saving mode. */
765 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
766 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
767 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
768 /* Update counter and free packet here to avoid counting this
769 * as a dropped packed. */
770 sta->rx_packets++;
771 dev_kfree_skb(rx->skb);
772 return RX_QUEUED;
773 }
774
775 return RX_CONTINUE;
776 } /* ieee80211_rx_h_sta_process */
777
778 static inline struct ieee80211_fragment_entry *
779 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
780 unsigned int frag, unsigned int seq, int rx_queue,
781 struct sk_buff **skb)
782 {
783 struct ieee80211_fragment_entry *entry;
784 int idx;
785
786 idx = sdata->fragment_next;
787 entry = &sdata->fragments[sdata->fragment_next++];
788 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
789 sdata->fragment_next = 0;
790
791 if (!skb_queue_empty(&entry->skb_list)) {
792 #ifdef CONFIG_MAC80211_DEBUG
793 struct ieee80211_hdr *hdr =
794 (struct ieee80211_hdr *) entry->skb_list.next->data;
795 DECLARE_MAC_BUF(mac);
796 DECLARE_MAC_BUF(mac2);
797 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
798 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
799 "addr1=%s addr2=%s\n",
800 sdata->dev->name, idx,
801 jiffies - entry->first_frag_time, entry->seq,
802 entry->last_frag, print_mac(mac, hdr->addr1),
803 print_mac(mac2, hdr->addr2));
804 #endif /* CONFIG_MAC80211_DEBUG */
805 __skb_queue_purge(&entry->skb_list);
806 }
807
808 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
809 *skb = NULL;
810 entry->first_frag_time = jiffies;
811 entry->seq = seq;
812 entry->rx_queue = rx_queue;
813 entry->last_frag = frag;
814 entry->ccmp = 0;
815 entry->extra_len = 0;
816
817 return entry;
818 }
819
820 static inline struct ieee80211_fragment_entry *
821 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
822 u16 fc, unsigned int frag, unsigned int seq,
823 int rx_queue, struct ieee80211_hdr *hdr)
824 {
825 struct ieee80211_fragment_entry *entry;
826 int i, idx;
827
828 idx = sdata->fragment_next;
829 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
830 struct ieee80211_hdr *f_hdr;
831 u16 f_fc;
832
833 idx--;
834 if (idx < 0)
835 idx = IEEE80211_FRAGMENT_MAX - 1;
836
837 entry = &sdata->fragments[idx];
838 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
839 entry->rx_queue != rx_queue ||
840 entry->last_frag + 1 != frag)
841 continue;
842
843 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
844 f_fc = le16_to_cpu(f_hdr->frame_control);
845
846 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
847 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
848 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
849 continue;
850
851 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
852 __skb_queue_purge(&entry->skb_list);
853 continue;
854 }
855 return entry;
856 }
857
858 return NULL;
859 }
860
861 static ieee80211_rx_result
862 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
863 {
864 struct ieee80211_hdr *hdr;
865 u16 sc;
866 unsigned int frag, seq;
867 struct ieee80211_fragment_entry *entry;
868 struct sk_buff *skb;
869 DECLARE_MAC_BUF(mac);
870
871 hdr = (struct ieee80211_hdr *) rx->skb->data;
872 sc = le16_to_cpu(hdr->seq_ctrl);
873 frag = sc & IEEE80211_SCTL_FRAG;
874
875 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
876 (rx->skb)->len < 24 ||
877 is_multicast_ether_addr(hdr->addr1))) {
878 /* not fragmented */
879 goto out;
880 }
881 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
882
883 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
884
885 if (frag == 0) {
886 /* This is the first fragment of a new frame. */
887 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
888 rx->queue, &(rx->skb));
889 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
890 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
891 /* Store CCMP PN so that we can verify that the next
892 * fragment has a sequential PN value. */
893 entry->ccmp = 1;
894 memcpy(entry->last_pn,
895 rx->key->u.ccmp.rx_pn[rx->queue],
896 CCMP_PN_LEN);
897 }
898 return RX_QUEUED;
899 }
900
901 /* This is a fragment for a frame that should already be pending in
902 * fragment cache. Add this fragment to the end of the pending entry.
903 */
904 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
905 rx->queue, hdr);
906 if (!entry) {
907 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
908 return RX_DROP_MONITOR;
909 }
910
911 /* Verify that MPDUs within one MSDU have sequential PN values.
912 * (IEEE 802.11i, 8.3.3.4.5) */
913 if (entry->ccmp) {
914 int i;
915 u8 pn[CCMP_PN_LEN], *rpn;
916 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
917 return RX_DROP_UNUSABLE;
918 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
919 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
920 pn[i]++;
921 if (pn[i])
922 break;
923 }
924 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
925 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
926 if (net_ratelimit())
927 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
928 "sequential A2=%s"
929 " PN=%02x%02x%02x%02x%02x%02x "
930 "(expected %02x%02x%02x%02x%02x%02x)\n",
931 rx->dev->name, print_mac(mac, hdr->addr2),
932 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
933 rpn[5], pn[0], pn[1], pn[2], pn[3],
934 pn[4], pn[5]);
935 return RX_DROP_UNUSABLE;
936 }
937 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
938 }
939
940 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
941 __skb_queue_tail(&entry->skb_list, rx->skb);
942 entry->last_frag = frag;
943 entry->extra_len += rx->skb->len;
944 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
945 rx->skb = NULL;
946 return RX_QUEUED;
947 }
948
949 rx->skb = __skb_dequeue(&entry->skb_list);
950 if (skb_tailroom(rx->skb) < entry->extra_len) {
951 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
952 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
953 GFP_ATOMIC))) {
954 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
955 __skb_queue_purge(&entry->skb_list);
956 return RX_DROP_UNUSABLE;
957 }
958 }
959 while ((skb = __skb_dequeue(&entry->skb_list))) {
960 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
961 dev_kfree_skb(skb);
962 }
963
964 /* Complete frame has been reassembled - process it now */
965 rx->flags |= IEEE80211_RX_FRAGMENTED;
966
967 out:
968 if (rx->sta)
969 rx->sta->rx_packets++;
970 if (is_multicast_ether_addr(hdr->addr1))
971 rx->local->dot11MulticastReceivedFrameCount++;
972 else
973 ieee80211_led_rx(rx->local);
974 return RX_CONTINUE;
975 }
976
977 static ieee80211_rx_result
978 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
979 {
980 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
981 struct sk_buff *skb;
982 int no_pending_pkts;
983 DECLARE_MAC_BUF(mac);
984
985 if (likely(!rx->sta ||
986 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
987 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
988 !(rx->flags & IEEE80211_RX_RA_MATCH)))
989 return RX_CONTINUE;
990
991 if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
992 (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
993 return RX_DROP_UNUSABLE;
994
995 skb = skb_dequeue(&rx->sta->tx_filtered);
996 if (!skb) {
997 skb = skb_dequeue(&rx->sta->ps_tx_buf);
998 if (skb)
999 rx->local->total_ps_buffered--;
1000 }
1001 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1002 skb_queue_empty(&rx->sta->ps_tx_buf);
1003
1004 if (skb) {
1005 struct ieee80211_hdr *hdr =
1006 (struct ieee80211_hdr *) skb->data;
1007
1008 /*
1009 * Tell TX path to send one frame even though the STA may
1010 * still remain is PS mode after this frame exchange.
1011 */
1012 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1013
1014 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1015 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
1016 print_mac(mac, rx->sta->addr), rx->sta->aid,
1017 skb_queue_len(&rx->sta->ps_tx_buf));
1018 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1019
1020 /* Use MoreData flag to indicate whether there are more
1021 * buffered frames for this STA */
1022 if (no_pending_pkts)
1023 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1024 else
1025 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1026
1027 dev_queue_xmit(skb);
1028
1029 if (no_pending_pkts)
1030 sta_info_clear_tim_bit(rx->sta);
1031 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1032 } else if (!rx->sent_ps_buffered) {
1033 /*
1034 * FIXME: This can be the result of a race condition between
1035 * us expiring a frame and the station polling for it.
1036 * Should we send it a null-func frame indicating we
1037 * have nothing buffered for it?
1038 */
1039 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
1040 "though there is no buffered frames for it\n",
1041 rx->dev->name, print_mac(mac, rx->sta->addr));
1042 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1043 }
1044
1045 /* Free PS Poll skb here instead of returning RX_DROP that would
1046 * count as an dropped frame. */
1047 dev_kfree_skb(rx->skb);
1048
1049 return RX_QUEUED;
1050 }
1051
1052 static ieee80211_rx_result
1053 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1054 {
1055 u16 fc = rx->fc;
1056 u8 *data = rx->skb->data;
1057 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
1058
1059 if (!WLAN_FC_IS_QOS_DATA(fc))
1060 return RX_CONTINUE;
1061
1062 /* remove the qos control field, update frame type and meta-data */
1063 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
1064 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
1065 /* change frame type to non QOS */
1066 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
1067 hdr->frame_control = cpu_to_le16(fc);
1068
1069 return RX_CONTINUE;
1070 }
1071
1072 static int
1073 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1074 {
1075 if (unlikely(!rx->sta ||
1076 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) {
1077 #ifdef CONFIG_MAC80211_DEBUG
1078 if (net_ratelimit())
1079 printk(KERN_DEBUG "%s: dropped frame "
1080 "(unauthorized port)\n", rx->dev->name);
1081 #endif /* CONFIG_MAC80211_DEBUG */
1082 return -EACCES;
1083 }
1084
1085 return 0;
1086 }
1087
1088 static int
1089 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx)
1090 {
1091 /*
1092 * Pass through unencrypted frames if the hardware has
1093 * decrypted them already.
1094 */
1095 if (rx->status->flag & RX_FLAG_DECRYPTED)
1096 return 0;
1097
1098 /* Drop unencrypted frames if key is set. */
1099 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1100 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1101 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1102 (rx->key || rx->sdata->drop_unencrypted)))
1103 return -EACCES;
1104
1105 return 0;
1106 }
1107
1108 static int
1109 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1110 {
1111 struct net_device *dev = rx->dev;
1112 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1113 u16 fc, hdrlen, ethertype;
1114 u8 *payload;
1115 u8 dst[ETH_ALEN];
1116 u8 src[ETH_ALEN] __aligned(2);
1117 struct sk_buff *skb = rx->skb;
1118 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1119 DECLARE_MAC_BUF(mac);
1120 DECLARE_MAC_BUF(mac2);
1121 DECLARE_MAC_BUF(mac3);
1122 DECLARE_MAC_BUF(mac4);
1123
1124 fc = rx->fc;
1125
1126 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1127 return -1;
1128
1129 hdrlen = ieee80211_get_hdrlen(fc);
1130
1131 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1132 int meshhdrlen = ieee80211_get_mesh_hdrlen(
1133 (struct ieee80211s_hdr *) (skb->data + hdrlen));
1134 /* Copy on cb:
1135 * - mesh header: to be used for mesh forwarding
1136 * decision. It will also be used as mesh header template at
1137 * tx.c:ieee80211_subif_start_xmit() if interface
1138 * type is mesh and skb->pkt_type == PACKET_OTHERHOST
1139 * - ta: to be used if a RERR needs to be sent.
1140 */
1141 memcpy(skb->cb, skb->data + hdrlen, meshhdrlen);
1142 memcpy(MESH_PREQ(skb), hdr->addr2, ETH_ALEN);
1143 hdrlen += meshhdrlen;
1144 }
1145
1146 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1147 * header
1148 * IEEE 802.11 address fields:
1149 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1150 * 0 0 DA SA BSSID n/a
1151 * 0 1 DA BSSID SA n/a
1152 * 1 0 BSSID SA DA n/a
1153 * 1 1 RA TA DA SA
1154 */
1155
1156 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1157 case IEEE80211_FCTL_TODS:
1158 /* BSSID SA DA */
1159 memcpy(dst, hdr->addr3, ETH_ALEN);
1160 memcpy(src, hdr->addr2, ETH_ALEN);
1161
1162 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
1163 sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) {
1164 if (net_ratelimit())
1165 printk(KERN_DEBUG "%s: dropped ToDS frame "
1166 "(BSSID=%s SA=%s DA=%s)\n",
1167 dev->name,
1168 print_mac(mac, hdr->addr1),
1169 print_mac(mac2, hdr->addr2),
1170 print_mac(mac3, hdr->addr3));
1171 return -1;
1172 }
1173 break;
1174 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1175 /* RA TA DA SA */
1176 memcpy(dst, hdr->addr3, ETH_ALEN);
1177 memcpy(src, hdr->addr4, ETH_ALEN);
1178
1179 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
1180 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT)) {
1181 if (net_ratelimit())
1182 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
1183 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1184 rx->dev->name,
1185 print_mac(mac, hdr->addr1),
1186 print_mac(mac2, hdr->addr2),
1187 print_mac(mac3, hdr->addr3),
1188 print_mac(mac4, hdr->addr4));
1189 return -1;
1190 }
1191 break;
1192 case IEEE80211_FCTL_FROMDS:
1193 /* DA BSSID SA */
1194 memcpy(dst, hdr->addr1, ETH_ALEN);
1195 memcpy(src, hdr->addr3, ETH_ALEN);
1196
1197 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
1198 (is_multicast_ether_addr(dst) &&
1199 !compare_ether_addr(src, dev->dev_addr)))
1200 return -1;
1201 break;
1202 case 0:
1203 /* DA SA BSSID */
1204 memcpy(dst, hdr->addr1, ETH_ALEN);
1205 memcpy(src, hdr->addr2, ETH_ALEN);
1206
1207 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
1208 if (net_ratelimit()) {
1209 printk(KERN_DEBUG "%s: dropped IBSS frame "
1210 "(DA=%s SA=%s BSSID=%s)\n",
1211 dev->name,
1212 print_mac(mac, hdr->addr1),
1213 print_mac(mac2, hdr->addr2),
1214 print_mac(mac3, hdr->addr3));
1215 }
1216 return -1;
1217 }
1218 break;
1219 }
1220
1221 if (unlikely(skb->len - hdrlen < 8)) {
1222 if (net_ratelimit()) {
1223 printk(KERN_DEBUG "%s: RX too short data frame "
1224 "payload\n", dev->name);
1225 }
1226 return -1;
1227 }
1228
1229 payload = skb->data + hdrlen;
1230 ethertype = (payload[6] << 8) | payload[7];
1231
1232 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1233 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1234 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1235 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1236 * replace EtherType */
1237 skb_pull(skb, hdrlen + 6);
1238 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1239 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1240 } else {
1241 struct ethhdr *ehdr;
1242 __be16 len;
1243
1244 skb_pull(skb, hdrlen);
1245 len = htons(skb->len);
1246 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1247 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1248 memcpy(ehdr->h_source, src, ETH_ALEN);
1249 ehdr->h_proto = len;
1250 }
1251 return 0;
1252 }
1253
1254 /*
1255 * requires that rx->skb is a frame with ethernet header
1256 */
1257 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx)
1258 {
1259 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1260 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1261 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1262
1263 /*
1264 * Allow EAPOL frames to us/the PAE group address regardless
1265 * of whether the frame was encrypted or not.
1266 */
1267 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1268 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1269 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1270 return true;
1271
1272 if (ieee80211_802_1x_port_control(rx) ||
1273 ieee80211_drop_unencrypted(rx))
1274 return false;
1275
1276 return true;
1277 }
1278
1279 /*
1280 * requires that rx->skb is a frame with ethernet header
1281 */
1282 static void
1283 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1284 {
1285 struct net_device *dev = rx->dev;
1286 struct ieee80211_local *local = rx->local;
1287 struct sk_buff *skb, *xmit_skb;
1288 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1289 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1290 struct sta_info *dsta;
1291
1292 skb = rx->skb;
1293 xmit_skb = NULL;
1294
1295 if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1296 sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
1297 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1298 if (is_multicast_ether_addr(ehdr->h_dest)) {
1299 /*
1300 * send multicast frames both to higher layers in
1301 * local net stack and back to the wireless medium
1302 */
1303 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1304 if (!xmit_skb && net_ratelimit())
1305 printk(KERN_DEBUG "%s: failed to clone "
1306 "multicast frame\n", dev->name);
1307 } else {
1308 dsta = sta_info_get(local, skb->data);
1309 if (dsta && dsta->sdata->dev == dev) {
1310 /*
1311 * The destination station is associated to
1312 * this AP (in this VLAN), so send the frame
1313 * directly to it and do not pass it to local
1314 * net stack.
1315 */
1316 xmit_skb = skb;
1317 skb = NULL;
1318 }
1319 }
1320 }
1321
1322 /* Mesh forwarding */
1323 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1324 u8 *mesh_ttl = &((struct ieee80211s_hdr *)skb->cb)->ttl;
1325 (*mesh_ttl)--;
1326
1327 if (is_multicast_ether_addr(skb->data)) {
1328 if (*mesh_ttl > 0) {
1329 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1330 if (xmit_skb)
1331 xmit_skb->pkt_type = PACKET_OTHERHOST;
1332 else if (net_ratelimit())
1333 printk(KERN_DEBUG "%s: failed to clone "
1334 "multicast frame\n", dev->name);
1335 } else
1336 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
1337 dropped_frames_ttl);
1338 } else if (skb->pkt_type != PACKET_OTHERHOST &&
1339 compare_ether_addr(dev->dev_addr, skb->data) != 0) {
1340 if (*mesh_ttl == 0) {
1341 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
1342 dropped_frames_ttl);
1343 dev_kfree_skb(skb);
1344 skb = NULL;
1345 } else {
1346 xmit_skb = skb;
1347 xmit_skb->pkt_type = PACKET_OTHERHOST;
1348 if (!(dev->flags & IFF_PROMISC))
1349 skb = NULL;
1350 }
1351 }
1352 }
1353
1354 if (skb) {
1355 /* deliver to local stack */
1356 skb->protocol = eth_type_trans(skb, dev);
1357 memset(skb->cb, 0, sizeof(skb->cb));
1358 netif_rx(skb);
1359 }
1360
1361 if (xmit_skb) {
1362 /* send to wireless media */
1363 xmit_skb->protocol = htons(ETH_P_802_3);
1364 skb_reset_network_header(xmit_skb);
1365 skb_reset_mac_header(xmit_skb);
1366 dev_queue_xmit(xmit_skb);
1367 }
1368 }
1369
1370 static ieee80211_rx_result
1371 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1372 {
1373 struct net_device *dev = rx->dev;
1374 struct ieee80211_local *local = rx->local;
1375 u16 fc, ethertype;
1376 u8 *payload;
1377 struct sk_buff *skb = rx->skb, *frame = NULL;
1378 const struct ethhdr *eth;
1379 int remaining, err;
1380 u8 dst[ETH_ALEN];
1381 u8 src[ETH_ALEN];
1382 DECLARE_MAC_BUF(mac);
1383
1384 fc = rx->fc;
1385 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1386 return RX_CONTINUE;
1387
1388 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1389 return RX_DROP_MONITOR;
1390
1391 if (!(rx->flags & IEEE80211_RX_AMSDU))
1392 return RX_CONTINUE;
1393
1394 err = ieee80211_data_to_8023(rx);
1395 if (unlikely(err))
1396 return RX_DROP_UNUSABLE;
1397
1398 skb->dev = dev;
1399
1400 dev->stats.rx_packets++;
1401 dev->stats.rx_bytes += skb->len;
1402
1403 /* skip the wrapping header */
1404 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1405 if (!eth)
1406 return RX_DROP_UNUSABLE;
1407
1408 while (skb != frame) {
1409 u8 padding;
1410 __be16 len = eth->h_proto;
1411 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1412
1413 remaining = skb->len;
1414 memcpy(dst, eth->h_dest, ETH_ALEN);
1415 memcpy(src, eth->h_source, ETH_ALEN);
1416
1417 padding = ((4 - subframe_len) & 0x3);
1418 /* the last MSDU has no padding */
1419 if (subframe_len > remaining) {
1420 printk(KERN_DEBUG "%s: wrong buffer size\n", dev->name);
1421 return RX_DROP_UNUSABLE;
1422 }
1423
1424 skb_pull(skb, sizeof(struct ethhdr));
1425 /* if last subframe reuse skb */
1426 if (remaining <= subframe_len + padding)
1427 frame = skb;
1428 else {
1429 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1430 subframe_len);
1431
1432 if (frame == NULL)
1433 return RX_DROP_UNUSABLE;
1434
1435 skb_reserve(frame, local->hw.extra_tx_headroom +
1436 sizeof(struct ethhdr));
1437 memcpy(skb_put(frame, ntohs(len)), skb->data,
1438 ntohs(len));
1439
1440 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1441 padding);
1442 if (!eth) {
1443 printk(KERN_DEBUG "%s: wrong buffer size\n",
1444 dev->name);
1445 dev_kfree_skb(frame);
1446 return RX_DROP_UNUSABLE;
1447 }
1448 }
1449
1450 skb_reset_network_header(frame);
1451 frame->dev = dev;
1452 frame->priority = skb->priority;
1453 rx->skb = frame;
1454
1455 payload = frame->data;
1456 ethertype = (payload[6] << 8) | payload[7];
1457
1458 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1459 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1460 compare_ether_addr(payload,
1461 bridge_tunnel_header) == 0)) {
1462 /* remove RFC1042 or Bridge-Tunnel
1463 * encapsulation and replace EtherType */
1464 skb_pull(frame, 6);
1465 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1466 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1467 } else {
1468 memcpy(skb_push(frame, sizeof(__be16)),
1469 &len, sizeof(__be16));
1470 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1471 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1472 }
1473
1474 if (!ieee80211_frame_allowed(rx)) {
1475 if (skb == frame) /* last frame */
1476 return RX_DROP_UNUSABLE;
1477 dev_kfree_skb(frame);
1478 continue;
1479 }
1480
1481 ieee80211_deliver_skb(rx);
1482 }
1483
1484 return RX_QUEUED;
1485 }
1486
1487 static ieee80211_rx_result
1488 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1489 {
1490 struct net_device *dev = rx->dev;
1491 u16 fc;
1492 int err;
1493
1494 fc = rx->fc;
1495 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1496 return RX_CONTINUE;
1497
1498 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1499 return RX_DROP_MONITOR;
1500
1501 err = ieee80211_data_to_8023(rx);
1502 if (unlikely(err))
1503 return RX_DROP_UNUSABLE;
1504
1505 if (!ieee80211_frame_allowed(rx))
1506 return RX_DROP_MONITOR;
1507
1508 rx->skb->dev = dev;
1509
1510 dev->stats.rx_packets++;
1511 dev->stats.rx_bytes += rx->skb->len;
1512
1513 ieee80211_deliver_skb(rx);
1514
1515 return RX_QUEUED;
1516 }
1517
1518 static ieee80211_rx_result
1519 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1520 {
1521 struct ieee80211_local *local = rx->local;
1522 struct ieee80211_hw *hw = &local->hw;
1523 struct sk_buff *skb = rx->skb;
1524 struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data;
1525 struct tid_ampdu_rx *tid_agg_rx;
1526 u16 start_seq_num;
1527 u16 tid;
1528
1529 if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL))
1530 return RX_CONTINUE;
1531
1532 if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) {
1533 if (!rx->sta)
1534 return RX_CONTINUE;
1535 tid = le16_to_cpu(bar->control) >> 12;
1536 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1537 != HT_AGG_STATE_OPERATIONAL)
1538 return RX_CONTINUE;
1539 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1540
1541 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1542
1543 /* reset session timer */
1544 if (tid_agg_rx->timeout) {
1545 unsigned long expires =
1546 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1547 mod_timer(&tid_agg_rx->session_timer, expires);
1548 }
1549
1550 /* manage reordering buffer according to requested */
1551 /* sequence number */
1552 rcu_read_lock();
1553 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1554 start_seq_num, 1);
1555 rcu_read_unlock();
1556 return RX_DROP_UNUSABLE;
1557 }
1558
1559 return RX_CONTINUE;
1560 }
1561
1562 static ieee80211_rx_result
1563 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1564 {
1565 struct ieee80211_sub_if_data *sdata;
1566
1567 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1568 return RX_DROP_MONITOR;
1569
1570 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1571 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1572 sdata->vif.type == IEEE80211_IF_TYPE_IBSS ||
1573 sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) &&
1574 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1575 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status);
1576 else
1577 return RX_DROP_MONITOR;
1578
1579 return RX_QUEUED;
1580 }
1581
1582 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1583 struct ieee80211_hdr *hdr,
1584 struct ieee80211_rx_data *rx)
1585 {
1586 int keyidx, hdrlen;
1587 DECLARE_MAC_BUF(mac);
1588 DECLARE_MAC_BUF(mac2);
1589
1590 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1591 if (rx->skb->len >= hdrlen + 4)
1592 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1593 else
1594 keyidx = -1;
1595
1596 if (net_ratelimit())
1597 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1598 "failure from %s to %s keyidx=%d\n",
1599 dev->name, print_mac(mac, hdr->addr2),
1600 print_mac(mac2, hdr->addr1), keyidx);
1601
1602 if (!rx->sta) {
1603 /*
1604 * Some hardware seem to generate incorrect Michael MIC
1605 * reports; ignore them to avoid triggering countermeasures.
1606 */
1607 if (net_ratelimit())
1608 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1609 "error for unknown address %s\n",
1610 dev->name, print_mac(mac, hdr->addr2));
1611 goto ignore;
1612 }
1613
1614 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1615 if (net_ratelimit())
1616 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1617 "error for a frame with no PROTECTED flag (src "
1618 "%s)\n", dev->name, print_mac(mac, hdr->addr2));
1619 goto ignore;
1620 }
1621
1622 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
1623 /*
1624 * APs with pairwise keys should never receive Michael MIC
1625 * errors for non-zero keyidx because these are reserved for
1626 * group keys and only the AP is sending real multicast
1627 * frames in the BSS.
1628 */
1629 if (net_ratelimit())
1630 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1631 "a frame with non-zero keyidx (%d)"
1632 " (src %s)\n", dev->name, keyidx,
1633 print_mac(mac, hdr->addr2));
1634 goto ignore;
1635 }
1636
1637 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1638 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1639 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1640 if (net_ratelimit())
1641 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1642 "error for a frame that cannot be encrypted "
1643 "(fc=0x%04x) (src %s)\n",
1644 dev->name, rx->fc, print_mac(mac, hdr->addr2));
1645 goto ignore;
1646 }
1647
1648 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1649 ignore:
1650 dev_kfree_skb(rx->skb);
1651 rx->skb = NULL;
1652 }
1653
1654 /* TODO: use IEEE80211_RX_FRAGMENTED */
1655 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1656 {
1657 struct ieee80211_sub_if_data *sdata;
1658 struct ieee80211_local *local = rx->local;
1659 struct ieee80211_rtap_hdr {
1660 struct ieee80211_radiotap_header hdr;
1661 u8 flags;
1662 u8 rate;
1663 __le16 chan_freq;
1664 __le16 chan_flags;
1665 } __attribute__ ((packed)) *rthdr;
1666 struct sk_buff *skb = rx->skb, *skb2;
1667 struct net_device *prev_dev = NULL;
1668 struct ieee80211_rx_status *status = rx->status;
1669
1670 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1671 goto out_free_skb;
1672
1673 if (skb_headroom(skb) < sizeof(*rthdr) &&
1674 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1675 goto out_free_skb;
1676
1677 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1678 memset(rthdr, 0, sizeof(*rthdr));
1679 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1680 rthdr->hdr.it_present =
1681 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1682 (1 << IEEE80211_RADIOTAP_RATE) |
1683 (1 << IEEE80211_RADIOTAP_CHANNEL));
1684
1685 rthdr->rate = rx->rate->bitrate / 5;
1686 rthdr->chan_freq = cpu_to_le16(status->freq);
1687
1688 if (status->band == IEEE80211_BAND_5GHZ)
1689 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1690 IEEE80211_CHAN_5GHZ);
1691 else
1692 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1693 IEEE80211_CHAN_2GHZ);
1694
1695 skb_set_mac_header(skb, 0);
1696 skb->ip_summed = CHECKSUM_UNNECESSARY;
1697 skb->pkt_type = PACKET_OTHERHOST;
1698 skb->protocol = htons(ETH_P_802_2);
1699
1700 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1701 if (!netif_running(sdata->dev))
1702 continue;
1703
1704 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
1705 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1706 continue;
1707
1708 if (prev_dev) {
1709 skb2 = skb_clone(skb, GFP_ATOMIC);
1710 if (skb2) {
1711 skb2->dev = prev_dev;
1712 netif_rx(skb2);
1713 }
1714 }
1715
1716 prev_dev = sdata->dev;
1717 sdata->dev->stats.rx_packets++;
1718 sdata->dev->stats.rx_bytes += skb->len;
1719 }
1720
1721 if (prev_dev) {
1722 skb->dev = prev_dev;
1723 netif_rx(skb);
1724 skb = NULL;
1725 } else
1726 goto out_free_skb;
1727
1728 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1729 return;
1730
1731 out_free_skb:
1732 dev_kfree_skb(skb);
1733 }
1734
1735 typedef ieee80211_rx_result (*ieee80211_rx_handler)(struct ieee80211_rx_data *);
1736 static ieee80211_rx_handler ieee80211_rx_handlers[] =
1737 {
1738 ieee80211_rx_h_passive_scan,
1739 ieee80211_rx_h_check,
1740 ieee80211_rx_h_decrypt,
1741 ieee80211_rx_h_sta_process,
1742 ieee80211_rx_h_defragment,
1743 ieee80211_rx_h_ps_poll,
1744 ieee80211_rx_h_michael_mic_verify,
1745 /* this must be after decryption - so header is counted in MPDU mic
1746 * must be before pae and data, so QOS_DATA format frames
1747 * are not passed to user space by these functions
1748 */
1749 ieee80211_rx_h_remove_qos_control,
1750 ieee80211_rx_h_amsdu,
1751 ieee80211_rx_h_data,
1752 ieee80211_rx_h_ctrl,
1753 ieee80211_rx_h_mgmt,
1754 NULL
1755 };
1756
1757 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1758 struct ieee80211_rx_data *rx,
1759 struct sk_buff *skb)
1760 {
1761 ieee80211_rx_handler *handler;
1762 ieee80211_rx_result res = RX_DROP_MONITOR;
1763
1764 rx->skb = skb;
1765 rx->sdata = sdata;
1766 rx->dev = sdata->dev;
1767
1768 for (handler = ieee80211_rx_handlers; *handler != NULL; handler++) {
1769 res = (*handler)(rx);
1770
1771 switch (res) {
1772 case RX_CONTINUE:
1773 continue;
1774 case RX_DROP_UNUSABLE:
1775 case RX_DROP_MONITOR:
1776 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1777 if (rx->sta)
1778 rx->sta->rx_dropped++;
1779 break;
1780 case RX_QUEUED:
1781 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1782 break;
1783 }
1784 break;
1785 }
1786
1787 switch (res) {
1788 case RX_CONTINUE:
1789 case RX_DROP_MONITOR:
1790 ieee80211_rx_cooked_monitor(rx);
1791 break;
1792 case RX_DROP_UNUSABLE:
1793 dev_kfree_skb(rx->skb);
1794 break;
1795 }
1796 }
1797
1798 /* main receive path */
1799
1800 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1801 u8 *bssid, struct ieee80211_rx_data *rx,
1802 struct ieee80211_hdr *hdr)
1803 {
1804 int multicast = is_multicast_ether_addr(hdr->addr1);
1805
1806 switch (sdata->vif.type) {
1807 case IEEE80211_IF_TYPE_STA:
1808 if (!bssid)
1809 return 0;
1810 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1811 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1812 return 0;
1813 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1814 } else if (!multicast &&
1815 compare_ether_addr(sdata->dev->dev_addr,
1816 hdr->addr1) != 0) {
1817 if (!(sdata->dev->flags & IFF_PROMISC))
1818 return 0;
1819 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1820 }
1821 break;
1822 case IEEE80211_IF_TYPE_IBSS:
1823 if (!bssid)
1824 return 0;
1825 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
1826 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
1827 if (!rx->sta)
1828 rx->sta = ieee80211_ibss_add_sta(sdata->dev,
1829 rx->skb, bssid, hdr->addr2,
1830 BIT(rx->status->rate_idx));
1831 return 1;
1832 }
1833 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1834 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1835 return 0;
1836 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1837 } else if (!multicast &&
1838 compare_ether_addr(sdata->dev->dev_addr,
1839 hdr->addr1) != 0) {
1840 if (!(sdata->dev->flags & IFF_PROMISC))
1841 return 0;
1842 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1843 } else if (!rx->sta)
1844 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1845 bssid, hdr->addr2,
1846 BIT(rx->status->rate_idx));
1847 break;
1848 case IEEE80211_IF_TYPE_MESH_POINT:
1849 if (!multicast &&
1850 compare_ether_addr(sdata->dev->dev_addr,
1851 hdr->addr1) != 0) {
1852 if (!(sdata->dev->flags & IFF_PROMISC))
1853 return 0;
1854
1855 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1856 }
1857 break;
1858 case IEEE80211_IF_TYPE_VLAN:
1859 case IEEE80211_IF_TYPE_AP:
1860 if (!bssid) {
1861 if (compare_ether_addr(sdata->dev->dev_addr,
1862 hdr->addr1))
1863 return 0;
1864 } else if (!ieee80211_bssid_match(bssid,
1865 sdata->dev->dev_addr)) {
1866 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1867 return 0;
1868 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1869 }
1870 if (sdata->dev == sdata->local->mdev &&
1871 !(rx->flags & IEEE80211_RX_IN_SCAN))
1872 /* do not receive anything via
1873 * master device when not scanning */
1874 return 0;
1875 break;
1876 case IEEE80211_IF_TYPE_WDS:
1877 if (bssid ||
1878 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1879 return 0;
1880 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1881 return 0;
1882 break;
1883 case IEEE80211_IF_TYPE_MNTR:
1884 /* take everything */
1885 break;
1886 case IEEE80211_IF_TYPE_INVALID:
1887 /* should never get here */
1888 WARN_ON(1);
1889 break;
1890 }
1891
1892 return 1;
1893 }
1894
1895 /*
1896 * This is the actual Rx frames handler. as it blongs to Rx path it must
1897 * be called with rcu_read_lock protection.
1898 */
1899 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1900 struct sk_buff *skb,
1901 struct ieee80211_rx_status *status,
1902 struct ieee80211_rate *rate)
1903 {
1904 struct ieee80211_local *local = hw_to_local(hw);
1905 struct ieee80211_sub_if_data *sdata;
1906 struct ieee80211_hdr *hdr;
1907 struct ieee80211_rx_data rx;
1908 u16 type;
1909 int prepares;
1910 struct ieee80211_sub_if_data *prev = NULL;
1911 struct sk_buff *skb_new;
1912 u8 *bssid;
1913
1914 hdr = (struct ieee80211_hdr *) skb->data;
1915 memset(&rx, 0, sizeof(rx));
1916 rx.skb = skb;
1917 rx.local = local;
1918
1919 rx.status = status;
1920 rx.rate = rate;
1921 rx.fc = le16_to_cpu(hdr->frame_control);
1922 type = rx.fc & IEEE80211_FCTL_FTYPE;
1923
1924 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1925 local->dot11ReceivedFragmentCount++;
1926
1927 rx.sta = sta_info_get(local, hdr->addr2);
1928 if (rx.sta) {
1929 rx.sdata = rx.sta->sdata;
1930 rx.dev = rx.sta->sdata->dev;
1931 }
1932
1933 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1934 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1935 return;
1936 }
1937
1938 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1939 rx.flags |= IEEE80211_RX_IN_SCAN;
1940
1941 ieee80211_parse_qos(&rx);
1942 ieee80211_verify_ip_alignment(&rx);
1943
1944 skb = rx.skb;
1945
1946 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1947 if (!netif_running(sdata->dev))
1948 continue;
1949
1950 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
1951 continue;
1952
1953 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1954 rx.flags |= IEEE80211_RX_RA_MATCH;
1955 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1956
1957 if (!prepares)
1958 continue;
1959
1960 /*
1961 * frame is destined for this interface, but if it's not
1962 * also for the previous one we handle that after the
1963 * loop to avoid copying the SKB once too much
1964 */
1965
1966 if (!prev) {
1967 prev = sdata;
1968 continue;
1969 }
1970
1971 /*
1972 * frame was destined for the previous interface
1973 * so invoke RX handlers for it
1974 */
1975
1976 skb_new = skb_copy(skb, GFP_ATOMIC);
1977 if (!skb_new) {
1978 if (net_ratelimit())
1979 printk(KERN_DEBUG "%s: failed to copy "
1980 "multicast frame for %s\n",
1981 wiphy_name(local->hw.wiphy),
1982 prev->dev->name);
1983 continue;
1984 }
1985 rx.fc = le16_to_cpu(hdr->frame_control);
1986 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
1987 prev = sdata;
1988 }
1989 if (prev) {
1990 rx.fc = le16_to_cpu(hdr->frame_control);
1991 ieee80211_invoke_rx_handlers(prev, &rx, skb);
1992 } else
1993 dev_kfree_skb(skb);
1994 }
1995
1996 #define SEQ_MODULO 0x1000
1997 #define SEQ_MASK 0xfff
1998
1999 static inline int seq_less(u16 sq1, u16 sq2)
2000 {
2001 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
2002 }
2003
2004 static inline u16 seq_inc(u16 sq)
2005 {
2006 return ((sq + 1) & SEQ_MASK);
2007 }
2008
2009 static inline u16 seq_sub(u16 sq1, u16 sq2)
2010 {
2011 return ((sq1 - sq2) & SEQ_MASK);
2012 }
2013
2014
2015 /*
2016 * As it function blongs to Rx path it must be called with
2017 * the proper rcu_read_lock protection for its flow.
2018 */
2019 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2020 struct tid_ampdu_rx *tid_agg_rx,
2021 struct sk_buff *skb, u16 mpdu_seq_num,
2022 int bar_req)
2023 {
2024 struct ieee80211_local *local = hw_to_local(hw);
2025 struct ieee80211_rx_status status;
2026 u16 head_seq_num, buf_size;
2027 int index;
2028 struct ieee80211_supported_band *sband;
2029 struct ieee80211_rate *rate;
2030
2031 buf_size = tid_agg_rx->buf_size;
2032 head_seq_num = tid_agg_rx->head_seq_num;
2033
2034 /* frame with out of date sequence number */
2035 if (seq_less(mpdu_seq_num, head_seq_num)) {
2036 dev_kfree_skb(skb);
2037 return 1;
2038 }
2039
2040 /* if frame sequence number exceeds our buffering window size or
2041 * block Ack Request arrived - release stored frames */
2042 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2043 /* new head to the ordering buffer */
2044 if (bar_req)
2045 head_seq_num = mpdu_seq_num;
2046 else
2047 head_seq_num =
2048 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2049 /* release stored frames up to new head to stack */
2050 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2051 index = seq_sub(tid_agg_rx->head_seq_num,
2052 tid_agg_rx->ssn)
2053 % tid_agg_rx->buf_size;
2054
2055 if (tid_agg_rx->reorder_buf[index]) {
2056 /* release the reordered frames to stack */
2057 memcpy(&status,
2058 tid_agg_rx->reorder_buf[index]->cb,
2059 sizeof(status));
2060 sband = local->hw.wiphy->bands[status.band];
2061 rate = &sband->bitrates[status.rate_idx];
2062 __ieee80211_rx_handle_packet(hw,
2063 tid_agg_rx->reorder_buf[index],
2064 &status, rate);
2065 tid_agg_rx->stored_mpdu_num--;
2066 tid_agg_rx->reorder_buf[index] = NULL;
2067 }
2068 tid_agg_rx->head_seq_num =
2069 seq_inc(tid_agg_rx->head_seq_num);
2070 }
2071 if (bar_req)
2072 return 1;
2073 }
2074
2075 /* now the new frame is always in the range of the reordering */
2076 /* buffer window */
2077 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2078 % tid_agg_rx->buf_size;
2079 /* check if we already stored this frame */
2080 if (tid_agg_rx->reorder_buf[index]) {
2081 dev_kfree_skb(skb);
2082 return 1;
2083 }
2084
2085 /* if arrived mpdu is in the right order and nothing else stored */
2086 /* release it immediately */
2087 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2088 tid_agg_rx->stored_mpdu_num == 0) {
2089 tid_agg_rx->head_seq_num =
2090 seq_inc(tid_agg_rx->head_seq_num);
2091 return 0;
2092 }
2093
2094 /* put the frame in the reordering buffer */
2095 tid_agg_rx->reorder_buf[index] = skb;
2096 tid_agg_rx->stored_mpdu_num++;
2097 /* release the buffer until next missing frame */
2098 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2099 % tid_agg_rx->buf_size;
2100 while (tid_agg_rx->reorder_buf[index]) {
2101 /* release the reordered frame back to stack */
2102 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2103 sizeof(status));
2104 sband = local->hw.wiphy->bands[status.band];
2105 rate = &sband->bitrates[status.rate_idx];
2106 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2107 &status, rate);
2108 tid_agg_rx->stored_mpdu_num--;
2109 tid_agg_rx->reorder_buf[index] = NULL;
2110 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2111 index = seq_sub(tid_agg_rx->head_seq_num,
2112 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2113 }
2114 return 1;
2115 }
2116
2117 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2118 struct sk_buff *skb)
2119 {
2120 struct ieee80211_hw *hw = &local->hw;
2121 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2122 struct sta_info *sta;
2123 struct tid_ampdu_rx *tid_agg_rx;
2124 u16 sc;
2125 u16 mpdu_seq_num;
2126 u8 ret = 0;
2127 int tid;
2128
2129 sta = sta_info_get(local, hdr->addr2);
2130 if (!sta)
2131 return ret;
2132
2133 /* filter the QoS data rx stream according to
2134 * STA/TID and check if this STA/TID is on aggregation */
2135 if (!ieee80211_is_data_qos(hdr->frame_control))
2136 goto end_reorder;
2137
2138 tid = *ieee80211_get_qos_ctl(hdr) & QOS_CONTROL_TID_MASK;
2139
2140 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2141 goto end_reorder;
2142
2143 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2144
2145 /* null data frames are excluded */
2146 if (unlikely(ieee80211_is_nullfunc(hdr->frame_control)))
2147 goto end_reorder;
2148
2149 /* new un-ordered ampdu frame - process it */
2150
2151 /* reset session timer */
2152 if (tid_agg_rx->timeout) {
2153 unsigned long expires =
2154 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2155 mod_timer(&tid_agg_rx->session_timer, expires);
2156 }
2157
2158 /* if this mpdu is fragmented - terminate rx aggregation session */
2159 sc = le16_to_cpu(hdr->seq_ctrl);
2160 if (sc & IEEE80211_SCTL_FRAG) {
2161 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
2162 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2163 ret = 1;
2164 goto end_reorder;
2165 }
2166
2167 /* according to mpdu sequence number deal with reordering buffer */
2168 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2169 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2170 mpdu_seq_num, 0);
2171 end_reorder:
2172 return ret;
2173 }
2174
2175 /*
2176 * This is the receive path handler. It is called by a low level driver when an
2177 * 802.11 MPDU is received from the hardware.
2178 */
2179 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2180 struct ieee80211_rx_status *status)
2181 {
2182 struct ieee80211_local *local = hw_to_local(hw);
2183 struct ieee80211_rate *rate = NULL;
2184 struct ieee80211_supported_band *sband;
2185
2186 if (status->band < 0 ||
2187 status->band >= IEEE80211_NUM_BANDS) {
2188 WARN_ON(1);
2189 return;
2190 }
2191
2192 sband = local->hw.wiphy->bands[status->band];
2193
2194 if (!sband ||
2195 status->rate_idx < 0 ||
2196 status->rate_idx >= sband->n_bitrates) {
2197 WARN_ON(1);
2198 return;
2199 }
2200
2201 rate = &sband->bitrates[status->rate_idx];
2202
2203 /*
2204 * key references and virtual interfaces are protected using RCU
2205 * and this requires that we are in a read-side RCU section during
2206 * receive processing
2207 */
2208 rcu_read_lock();
2209
2210 /*
2211 * Frames with failed FCS/PLCP checksum are not returned,
2212 * all other frames are returned without radiotap header
2213 * if it was previously present.
2214 * Also, frames with less than 16 bytes are dropped.
2215 */
2216 skb = ieee80211_rx_monitor(local, skb, status, rate);
2217 if (!skb) {
2218 rcu_read_unlock();
2219 return;
2220 }
2221
2222 if (!ieee80211_rx_reorder_ampdu(local, skb))
2223 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2224
2225 rcu_read_unlock();
2226 }
2227 EXPORT_SYMBOL(__ieee80211_rx);
2228
2229 /* This is a version of the rx handler that can be called from hard irq
2230 * context. Post the skb on the queue and schedule the tasklet */
2231 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2232 struct ieee80211_rx_status *status)
2233 {
2234 struct ieee80211_local *local = hw_to_local(hw);
2235
2236 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2237
2238 skb->dev = local->mdev;
2239 /* copy status into skb->cb for use by tasklet */
2240 memcpy(skb->cb, status, sizeof(*status));
2241 skb->pkt_type = IEEE80211_RX_MSG;
2242 skb_queue_tail(&local->skb_queue, skb);
2243 tasklet_schedule(&local->tasklet);
2244 }
2245 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree