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fix up hostapd for mac80211
[openwrt/svn-archive/archive.git] / package / mac80211 / src / net / mac80211 / rx.c
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>
16 #include <linux/rcupdate.h>
17 #include <net/mac80211.h>
18 #include <net/ieee80211_radiotap.h>
19
20 #include "ieee80211_i.h"
21 #include "ieee80211_led.h"
22 #include "wep.h"
23 #include "wpa.h"
24 #include "tkip.h"
25 #include "wme.h"
26
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 */
33 static 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
53 static 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;
64 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
65 cpu_to_le16(IEEE80211_FTYPE_CTL))
66 return 1;
67 return 0;
68 }
69
70 /*
71 * This function copies a received frame to all monitor interfaces and
72 * returns a cleaned-up SKB that no longer includes the FCS nor the
73 * radiotap header the driver might have added.
74 */
75 static struct sk_buff *
76 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
77 struct ieee80211_rx_status *status)
78 {
79 struct ieee80211_sub_if_data *sdata;
80 struct ieee80211_rate *rate;
81 int needed_headroom = 0;
82 struct ieee80211_rtap_hdr {
83 struct ieee80211_radiotap_header hdr;
84 u8 flags;
85 u8 rate;
86 __le16 chan_freq;
87 __le16 chan_flags;
88 u8 antsignal;
89 u8 padding_for_rxflags;
90 __le16 rx_flags;
91 } __attribute__ ((packed)) *rthdr;
92 struct sk_buff *skb, *skb2;
93 struct net_device *prev_dev = NULL;
94 int present_fcs_len = 0;
95 int rtap_len = 0;
96
97 /*
98 * First, we may need to make a copy of the skb because
99 * (1) we need to modify it for radiotap (if not present), and
100 * (2) the other RX handlers will modify the skb we got.
101 *
102 * We don't need to, of course, if we aren't going to return
103 * the SKB because it has a bad FCS/PLCP checksum.
104 */
105 if (status->flag & RX_FLAG_RADIOTAP)
106 rtap_len = ieee80211_get_radiotap_len(origskb->data);
107 else
108 needed_headroom = sizeof(*rthdr);
109
110 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
111 present_fcs_len = FCS_LEN;
112
113 if (!local->monitors) {
114 if (should_drop_frame(status, origskb, present_fcs_len,
115 rtap_len)) {
116 dev_kfree_skb(origskb);
117 return NULL;
118 }
119
120 return remove_monitor_info(local, origskb, rtap_len);
121 }
122
123 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
124 /* only need to expand headroom if necessary */
125 skb = origskb;
126 origskb = NULL;
127
128 /*
129 * This shouldn't trigger often because most devices have an
130 * RX header they pull before we get here, and that should
131 * be big enough for our radiotap information. We should
132 * probably export the length to drivers so that we can have
133 * them allocate enough headroom to start with.
134 */
135 if (skb_headroom(skb) < needed_headroom &&
136 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
137 dev_kfree_skb(skb);
138 return NULL;
139 }
140 } else {
141 /*
142 * Need to make a copy and possibly remove radiotap header
143 * and FCS from the original.
144 */
145 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
146
147 origskb = remove_monitor_info(local, origskb, rtap_len);
148
149 if (!skb)
150 return origskb;
151 }
152
153 /* if necessary, prepend radiotap information */
154 if (!(status->flag & RX_FLAG_RADIOTAP)) {
155 rthdr = (void *) skb_push(skb, sizeof(*rthdr));
156 memset(rthdr, 0, sizeof(*rthdr));
157 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
158 rthdr->hdr.it_present =
159 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
160 (1 << IEEE80211_RADIOTAP_RATE) |
161 (1 << IEEE80211_RADIOTAP_CHANNEL) |
162 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) |
163 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
164 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
165 IEEE80211_RADIOTAP_F_FCS : 0;
166
167 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
168 rthdr->rx_flags = 0;
169 if (status->flag &
170 (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
171 rthdr->rx_flags |=
172 cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
173
174 rate = ieee80211_get_rate(local, status->phymode,
175 status->rate);
176 if (rate)
177 rthdr->rate = rate->rate / 5;
178
179 rthdr->chan_freq = cpu_to_le16(status->freq);
180
181 if (status->phymode == MODE_IEEE80211A)
182 rthdr->chan_flags =
183 cpu_to_le16(IEEE80211_CHAN_OFDM |
184 IEEE80211_CHAN_5GHZ);
185 else
186 rthdr->chan_flags =
187 cpu_to_le16(IEEE80211_CHAN_DYN |
188 IEEE80211_CHAN_2GHZ);
189
190 rthdr->antsignal = status->ssi;
191 }
192
193 skb_set_mac_header(skb, 0);
194 skb->ip_summed = CHECKSUM_UNNECESSARY;
195 skb->pkt_type = PACKET_OTHERHOST;
196 skb->protocol = htons(ETH_P_802_2);
197
198 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
199 if (!netif_running(sdata->dev))
200 continue;
201
202 if (sdata->type != IEEE80211_IF_TYPE_MNTR)
203 continue;
204
205 if (prev_dev) {
206 skb2 = skb_clone(skb, GFP_ATOMIC);
207 if (skb2) {
208 skb2->dev = prev_dev;
209 netif_rx(skb2);
210 }
211 }
212
213 prev_dev = sdata->dev;
214 sdata->dev->stats.rx_packets++;
215 sdata->dev->stats.rx_bytes += skb->len;
216 }
217
218 if (prev_dev) {
219 skb->dev = prev_dev;
220 netif_rx(skb);
221 } else
222 dev_kfree_skb(skb);
223
224 return origskb;
225 }
226
227
228 /* pre-rx handlers
229 *
230 * these don't have dev/sdata fields in the rx data
231 * The sta value should also not be used because it may
232 * be NULL even though a STA (in IBSS mode) will be added.
233 */
234
235 static ieee80211_txrx_result
236 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
237 {
238 u8 *data = rx->skb->data;
239 int tid;
240
241 /* does the frame have a qos control field? */
242 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
243 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
244 /* frame has qos control */
245 tid = qc[0] & QOS_CONTROL_TID_MASK;
246 } else {
247 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
248 /* Separate TID for management frames */
249 tid = NUM_RX_DATA_QUEUES - 1;
250 } else {
251 /* no qos control present */
252 tid = 0; /* 802.1d - Best Effort */
253 }
254 }
255
256 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
257 /* only a debug counter, sta might not be assigned properly yet */
258 if (rx->sta)
259 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
260
261 rx->u.rx.queue = tid;
262 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
263 * For now, set skb->priority to 0 for other cases. */
264 rx->skb->priority = (tid > 7) ? 0 : tid;
265
266 return TXRX_CONTINUE;
267 }
268
269 static ieee80211_txrx_result
270 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
271 {
272 struct ieee80211_local *local = rx->local;
273 struct sk_buff *skb = rx->skb;
274 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
275 u32 load = 0, hdrtime;
276 struct ieee80211_rate *rate;
277 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
278 int i;
279
280 /* Estimate total channel use caused by this frame */
281
282 if (unlikely(mode->num_rates < 0))
283 return TXRX_CONTINUE;
284
285 rate = &mode->rates[0];
286 for (i = 0; i < mode->num_rates; i++) {
287 if (mode->rates[i].val == rx->u.rx.status->rate) {
288 rate = &mode->rates[i];
289 break;
290 }
291 }
292
293 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
294 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
295
296 if (mode->mode == MODE_IEEE80211A ||
297 (mode->mode == MODE_IEEE80211G &&
298 rate->flags & IEEE80211_RATE_ERP))
299 hdrtime = CHAN_UTIL_HDR_SHORT;
300 else
301 hdrtime = CHAN_UTIL_HDR_LONG;
302
303 load = hdrtime;
304 if (!is_multicast_ether_addr(hdr->addr1))
305 load += hdrtime;
306
307 load += skb->len * rate->rate_inv;
308
309 /* Divide channel_use by 8 to avoid wrapping around the counter */
310 load >>= CHAN_UTIL_SHIFT;
311 local->channel_use_raw += load;
312 rx->u.rx.load = load;
313
314 return TXRX_CONTINUE;
315 }
316
317 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
318 {
319 ieee80211_rx_h_parse_qos,
320 ieee80211_rx_h_load_stats,
321 NULL
322 };
323
324 /* rx handlers */
325
326 static ieee80211_txrx_result
327 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
328 {
329 if (rx->sta)
330 rx->sta->channel_use_raw += rx->u.rx.load;
331 rx->sdata->channel_use_raw += rx->u.rx.load;
332 return TXRX_CONTINUE;
333 }
334
335 static ieee80211_txrx_result
336 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
337 {
338 struct ieee80211_local *local = rx->local;
339 struct sk_buff *skb = rx->skb;
340
341 if (unlikely(local->sta_scanning != 0)) {
342 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
343 return TXRX_QUEUED;
344 }
345
346 if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
347 /* scanning finished during invoking of handlers */
348 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
349 return TXRX_DROP;
350 }
351
352 return TXRX_CONTINUE;
353 }
354
355 static ieee80211_txrx_result
356 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
357 {
358 struct ieee80211_hdr *hdr;
359 hdr = (struct ieee80211_hdr *) rx->skb->data;
360
361 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
362 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
363 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
364 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
365 hdr->seq_ctrl)) {
366 if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
367 rx->local->dot11FrameDuplicateCount++;
368 rx->sta->num_duplicates++;
369 }
370 return TXRX_DROP;
371 } else
372 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
373 }
374
375 if (unlikely(rx->skb->len < 16)) {
376 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
377 return TXRX_DROP;
378 }
379
380 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
381 rx->skb->pkt_type = PACKET_OTHERHOST;
382 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
383 rx->skb->pkt_type = PACKET_HOST;
384 else if (is_multicast_ether_addr(hdr->addr1)) {
385 if (is_broadcast_ether_addr(hdr->addr1))
386 rx->skb->pkt_type = PACKET_BROADCAST;
387 else
388 rx->skb->pkt_type = PACKET_MULTICAST;
389 } else
390 rx->skb->pkt_type = PACKET_OTHERHOST;
391
392 /* Drop disallowed frame classes based on STA auth/assoc state;
393 * IEEE 802.11, Chap 5.5.
394 *
395 * 80211.o does filtering only based on association state, i.e., it
396 * drops Class 3 frames from not associated stations. hostapd sends
397 * deauth/disassoc frames when needed. In addition, hostapd is
398 * responsible for filtering on both auth and assoc states.
399 */
400 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
401 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
402 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
403 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
404 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
405 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
406 !(rx->fc & IEEE80211_FCTL_TODS) &&
407 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
408 || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
409 /* Drop IBSS frames and frames for other hosts
410 * silently. */
411 return TXRX_DROP;
412 }
413
414 return TXRX_DROP;
415 }
416
417 return TXRX_CONTINUE;
418 }
419
420
421 static ieee80211_txrx_result
422 ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
423 {
424 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
425 int keyidx;
426 int hdrlen;
427 ieee80211_txrx_result result = TXRX_DROP;
428 struct ieee80211_key *stakey = NULL;
429
430 /*
431 * Key selection 101
432 *
433 * There are three types of keys:
434 * - GTK (group keys)
435 * - PTK (pairwise keys)
436 * - STK (station-to-station pairwise keys)
437 *
438 * When selecting a key, we have to distinguish between multicast
439 * (including broadcast) and unicast frames, the latter can only
440 * use PTKs and STKs while the former always use GTKs. Unless, of
441 * course, actual WEP keys ("pre-RSNA") are used, then unicast
442 * frames can also use key indizes like GTKs. Hence, if we don't
443 * have a PTK/STK we check the key index for a WEP key.
444 *
445 * Note that in a regular BSS, multicast frames are sent by the
446 * AP only, associated stations unicast the frame to the AP first
447 * which then multicasts it on their behalf.
448 *
449 * There is also a slight problem in IBSS mode: GTKs are negotiated
450 * with each station, that is something we don't currently handle.
451 * The spec seems to expect that one negotiates the same key with
452 * every station but there's no such requirement; VLANs could be
453 * possible.
454 */
455
456 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
457 return TXRX_CONTINUE;
458
459 /*
460 * No point in finding a key and decrypting if the frame is neither
461 * addressed to us nor a multicast frame.
462 */
463 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
464 return TXRX_CONTINUE;
465
466 if (rx->sta)
467 stakey = rcu_dereference(rx->sta->key);
468
469 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
470 rx->key = stakey;
471 } else {
472 /*
473 * The device doesn't give us the IV so we won't be
474 * able to look up the key. That's ok though, we
475 * don't need to decrypt the frame, we just won't
476 * be able to keep statistics accurate.
477 * Except for key threshold notifications, should
478 * we somehow allow the driver to tell us which key
479 * the hardware used if this flag is set?
480 */
481 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
482 (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
483 return TXRX_CONTINUE;
484
485 hdrlen = ieee80211_get_hdrlen(rx->fc);
486
487 if (rx->skb->len < 8 + hdrlen)
488 return TXRX_DROP; /* TODO: count this? */
489
490 /*
491 * no need to call ieee80211_wep_get_keyidx,
492 * it verifies a bunch of things we've done already
493 */
494 keyidx = rx->skb->data[hdrlen + 3] >> 6;
495
496 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
497
498 /*
499 * RSNA-protected unicast frames should always be sent with
500 * pairwise or station-to-station keys, but for WEP we allow
501 * using a key index as well.
502 */
503 if (rx->key && rx->key->conf.alg != ALG_WEP &&
504 !is_multicast_ether_addr(hdr->addr1))
505 rx->key = NULL;
506 }
507
508 if (rx->key) {
509 rx->key->tx_rx_count++;
510 /* TODO: add threshold stuff again */
511 } else {
512 if (net_ratelimit())
513 printk(KERN_DEBUG "%s: RX protected frame,"
514 " but have no key\n", rx->dev->name);
515 return TXRX_DROP;
516 }
517
518 /* Check for weak IVs if possible */
519 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
520 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
521 (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
522 !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
523 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
524 rx->sta->wep_weak_iv_count++;
525
526 switch (rx->key->conf.alg) {
527 case ALG_WEP:
528 result = ieee80211_crypto_wep_decrypt(rx);
529 break;
530 case ALG_TKIP:
531 result = ieee80211_crypto_tkip_decrypt(rx);
532 break;
533 case ALG_CCMP:
534 result = ieee80211_crypto_ccmp_decrypt(rx);
535 break;
536 }
537
538 /* either the frame has been decrypted or will be dropped */
539 rx->u.rx.status->flag |= RX_FLAG_DECRYPTED;
540
541 return result;
542 }
543
544 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
545 {
546 struct ieee80211_sub_if_data *sdata;
547 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
548
549 if (sdata->bss)
550 atomic_inc(&sdata->bss->num_sta_ps);
551 sta->flags |= WLAN_STA_PS;
552 sta->pspoll = 0;
553 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
554 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
555 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
556 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
557 }
558
559 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
560 {
561 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
562 struct sk_buff *skb;
563 int sent = 0;
564 struct ieee80211_sub_if_data *sdata;
565 struct ieee80211_tx_packet_data *pkt_data;
566
567 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
568 if (sdata->bss)
569 atomic_dec(&sdata->bss->num_sta_ps);
570 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
571 sta->pspoll = 0;
572 if (!skb_queue_empty(&sta->ps_tx_buf)) {
573 if (local->ops->set_tim)
574 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
575 if (sdata->bss)
576 bss_tim_clear(local, sdata->bss, sta->aid);
577 }
578 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
579 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
580 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
581 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
582 /* Send all buffered frames to the station */
583 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
584 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
585 sent++;
586 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
587 dev_queue_xmit(skb);
588 }
589 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
590 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
591 local->total_ps_buffered--;
592 sent++;
593 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
594 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
595 "since STA not sleeping anymore\n", dev->name,
596 MAC_ARG(sta->addr), sta->aid);
597 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
598 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
599 dev_queue_xmit(skb);
600 }
601
602 return sent;
603 }
604
605 static ieee80211_txrx_result
606 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
607 {
608 struct sta_info *sta = rx->sta;
609 struct net_device *dev = rx->dev;
610 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
611
612 if (!sta)
613 return TXRX_CONTINUE;
614
615 /* Update last_rx only for IBSS packets which are for the current
616 * BSSID to avoid keeping the current IBSS network alive in cases where
617 * other STAs are using different BSSID. */
618 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
619 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
620 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
621 sta->last_rx = jiffies;
622 } else
623 if (!is_multicast_ether_addr(hdr->addr1) ||
624 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
625 /* Update last_rx only for unicast frames in order to prevent
626 * the Probe Request frames (the only broadcast frames from a
627 * STA in infrastructure mode) from keeping a connection alive.
628 */
629 sta->last_rx = jiffies;
630 }
631
632 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
633 return TXRX_CONTINUE;
634
635 sta->rx_fragments++;
636 sta->rx_bytes += rx->skb->len;
637 sta->last_rssi = rx->u.rx.status->ssi;
638 sta->last_signal = rx->u.rx.status->signal;
639 sta->last_noise = rx->u.rx.status->noise;
640
641 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
642 /* Change STA power saving mode only in the end of a frame
643 * exchange sequence */
644 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
645 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
646 else if (!(sta->flags & WLAN_STA_PS) &&
647 (rx->fc & IEEE80211_FCTL_PM))
648 ap_sta_ps_start(dev, sta);
649 }
650
651 /* Drop data::nullfunc frames silently, since they are used only to
652 * control station power saving mode. */
653 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
654 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
655 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
656 /* Update counter and free packet here to avoid counting this
657 * as a dropped packed. */
658 sta->rx_packets++;
659 dev_kfree_skb(rx->skb);
660 return TXRX_QUEUED;
661 }
662
663 return TXRX_CONTINUE;
664 } /* ieee80211_rx_h_sta_process */
665
666 static inline struct ieee80211_fragment_entry *
667 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
668 unsigned int frag, unsigned int seq, int rx_queue,
669 struct sk_buff **skb)
670 {
671 struct ieee80211_fragment_entry *entry;
672 int idx;
673
674 idx = sdata->fragment_next;
675 entry = &sdata->fragments[sdata->fragment_next++];
676 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
677 sdata->fragment_next = 0;
678
679 if (!skb_queue_empty(&entry->skb_list)) {
680 #ifdef CONFIG_MAC80211_DEBUG
681 struct ieee80211_hdr *hdr =
682 (struct ieee80211_hdr *) entry->skb_list.next->data;
683 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
684 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
685 "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
686 sdata->dev->name, idx,
687 jiffies - entry->first_frag_time, entry->seq,
688 entry->last_frag, MAC_ARG(hdr->addr1),
689 MAC_ARG(hdr->addr2));
690 #endif /* CONFIG_MAC80211_DEBUG */
691 __skb_queue_purge(&entry->skb_list);
692 }
693
694 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
695 *skb = NULL;
696 entry->first_frag_time = jiffies;
697 entry->seq = seq;
698 entry->rx_queue = rx_queue;
699 entry->last_frag = frag;
700 entry->ccmp = 0;
701 entry->extra_len = 0;
702
703 return entry;
704 }
705
706 static inline struct ieee80211_fragment_entry *
707 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
708 u16 fc, unsigned int frag, unsigned int seq,
709 int rx_queue, struct ieee80211_hdr *hdr)
710 {
711 struct ieee80211_fragment_entry *entry;
712 int i, idx;
713
714 idx = sdata->fragment_next;
715 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
716 struct ieee80211_hdr *f_hdr;
717 u16 f_fc;
718
719 idx--;
720 if (idx < 0)
721 idx = IEEE80211_FRAGMENT_MAX - 1;
722
723 entry = &sdata->fragments[idx];
724 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
725 entry->rx_queue != rx_queue ||
726 entry->last_frag + 1 != frag)
727 continue;
728
729 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
730 f_fc = le16_to_cpu(f_hdr->frame_control);
731
732 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
733 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
734 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
735 continue;
736
737 if (entry->first_frag_time + 2 * HZ < jiffies) {
738 __skb_queue_purge(&entry->skb_list);
739 continue;
740 }
741 return entry;
742 }
743
744 return NULL;
745 }
746
747 static ieee80211_txrx_result
748 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
749 {
750 struct ieee80211_hdr *hdr;
751 u16 sc;
752 unsigned int frag, seq;
753 struct ieee80211_fragment_entry *entry;
754 struct sk_buff *skb;
755
756 hdr = (struct ieee80211_hdr *) rx->skb->data;
757 sc = le16_to_cpu(hdr->seq_ctrl);
758 frag = sc & IEEE80211_SCTL_FRAG;
759
760 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
761 (rx->skb)->len < 24 ||
762 is_multicast_ether_addr(hdr->addr1))) {
763 /* not fragmented */
764 goto out;
765 }
766 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
767
768 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
769
770 if (frag == 0) {
771 /* This is the first fragment of a new frame. */
772 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
773 rx->u.rx.queue, &(rx->skb));
774 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
775 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
776 /* Store CCMP PN so that we can verify that the next
777 * fragment has a sequential PN value. */
778 entry->ccmp = 1;
779 memcpy(entry->last_pn,
780 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
781 CCMP_PN_LEN);
782 }
783 return TXRX_QUEUED;
784 }
785
786 /* This is a fragment for a frame that should already be pending in
787 * fragment cache. Add this fragment to the end of the pending entry.
788 */
789 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
790 rx->u.rx.queue, hdr);
791 if (!entry) {
792 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
793 return TXRX_DROP;
794 }
795
796 /* Verify that MPDUs within one MSDU have sequential PN values.
797 * (IEEE 802.11i, 8.3.3.4.5) */
798 if (entry->ccmp) {
799 int i;
800 u8 pn[CCMP_PN_LEN], *rpn;
801 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
802 return TXRX_DROP;
803 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
804 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
805 pn[i]++;
806 if (pn[i])
807 break;
808 }
809 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
810 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
811 if (net_ratelimit())
812 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
813 "sequential A2=" MAC_FMT
814 " PN=%02x%02x%02x%02x%02x%02x "
815 "(expected %02x%02x%02x%02x%02x%02x)\n",
816 rx->dev->name, MAC_ARG(hdr->addr2),
817 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
818 rpn[5], pn[0], pn[1], pn[2], pn[3],
819 pn[4], pn[5]);
820 return TXRX_DROP;
821 }
822 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
823 }
824
825 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
826 __skb_queue_tail(&entry->skb_list, rx->skb);
827 entry->last_frag = frag;
828 entry->extra_len += rx->skb->len;
829 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
830 rx->skb = NULL;
831 return TXRX_QUEUED;
832 }
833
834 rx->skb = __skb_dequeue(&entry->skb_list);
835 if (skb_tailroom(rx->skb) < entry->extra_len) {
836 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
837 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
838 GFP_ATOMIC))) {
839 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
840 __skb_queue_purge(&entry->skb_list);
841 return TXRX_DROP;
842 }
843 }
844 while ((skb = __skb_dequeue(&entry->skb_list))) {
845 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
846 dev_kfree_skb(skb);
847 }
848
849 /* Complete frame has been reassembled - process it now */
850 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
851
852 out:
853 if (rx->sta)
854 rx->sta->rx_packets++;
855 if (is_multicast_ether_addr(hdr->addr1))
856 rx->local->dot11MulticastReceivedFrameCount++;
857 else
858 ieee80211_led_rx(rx->local);
859 return TXRX_CONTINUE;
860 }
861
862 static ieee80211_txrx_result
863 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
864 {
865 struct sk_buff *skb;
866 int no_pending_pkts;
867
868 if (likely(!rx->sta ||
869 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
870 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
871 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
872 return TXRX_CONTINUE;
873
874 skb = skb_dequeue(&rx->sta->tx_filtered);
875 if (!skb) {
876 skb = skb_dequeue(&rx->sta->ps_tx_buf);
877 if (skb)
878 rx->local->total_ps_buffered--;
879 }
880 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
881 skb_queue_empty(&rx->sta->ps_tx_buf);
882
883 if (skb) {
884 struct ieee80211_hdr *hdr =
885 (struct ieee80211_hdr *) skb->data;
886
887 /* tell TX path to send one frame even though the STA may
888 * still remain is PS mode after this frame exchange */
889 rx->sta->pspoll = 1;
890
891 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
892 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
893 "after %d)\n",
894 MAC_ARG(rx->sta->addr), rx->sta->aid,
895 skb_queue_len(&rx->sta->ps_tx_buf));
896 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
897
898 /* Use MoreData flag to indicate whether there are more
899 * buffered frames for this STA */
900 if (no_pending_pkts) {
901 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
902 rx->sta->flags &= ~WLAN_STA_TIM;
903 } else
904 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
905
906 dev_queue_xmit(skb);
907
908 if (no_pending_pkts) {
909 if (rx->local->ops->set_tim)
910 rx->local->ops->set_tim(local_to_hw(rx->local),
911 rx->sta->aid, 0);
912 if (rx->sdata->bss)
913 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
914 }
915 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
916 } else if (!rx->u.rx.sent_ps_buffered) {
917 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
918 "though there is no buffered frames for it\n",
919 rx->dev->name, MAC_ARG(rx->sta->addr));
920 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
921
922 }
923
924 /* Free PS Poll skb here instead of returning TXRX_DROP that would
925 * count as an dropped frame. */
926 dev_kfree_skb(rx->skb);
927
928 return TXRX_QUEUED;
929 }
930
931 static ieee80211_txrx_result
932 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
933 {
934 u16 fc = rx->fc;
935 u8 *data = rx->skb->data;
936 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
937
938 if (!WLAN_FC_IS_QOS_DATA(fc))
939 return TXRX_CONTINUE;
940
941 /* remove the qos control field, update frame type and meta-data */
942 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
943 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
944 /* change frame type to non QOS */
945 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
946 hdr->frame_control = cpu_to_le16(fc);
947
948 return TXRX_CONTINUE;
949 }
950
951 static ieee80211_txrx_result
952 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
953 {
954 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
955 rx->sdata->type != IEEE80211_IF_TYPE_STA &&
956 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
957 return TXRX_CONTINUE;
958
959 if (unlikely(rx->sdata->ieee802_1x &&
960 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
961 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
962 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
963 !ieee80211_is_eapol(rx->skb))) {
964 #ifdef CONFIG_MAC80211_DEBUG
965 struct ieee80211_hdr *hdr =
966 (struct ieee80211_hdr *) rx->skb->data;
967 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
968 " (unauthorized port)\n", rx->dev->name,
969 MAC_ARG(hdr->addr2));
970 #endif /* CONFIG_MAC80211_DEBUG */
971 return TXRX_DROP;
972 }
973
974 return TXRX_CONTINUE;
975 }
976
977 static ieee80211_txrx_result
978 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
979 {
980 /*
981 * Pass through unencrypted frames if the hardware has
982 * decrypted them already.
983 */
984 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
985 return TXRX_CONTINUE;
986
987 /* Drop unencrypted frames if key is set. */
988 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
989 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
990 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
991 rx->sdata->drop_unencrypted &&
992 (rx->sdata->eapol == 0 || !ieee80211_is_eapol(rx->skb)))) {
993 if (net_ratelimit())
994 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
995 "encryption\n", rx->dev->name);
996 return TXRX_DROP;
997 }
998 return TXRX_CONTINUE;
999 }
1000
1001 static ieee80211_txrx_result
1002 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
1003 {
1004 struct net_device *dev = rx->dev;
1005 struct ieee80211_local *local = rx->local;
1006 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1007 u16 fc, hdrlen, ethertype;
1008 u8 *payload;
1009 u8 dst[ETH_ALEN];
1010 u8 src[ETH_ALEN];
1011 struct sk_buff *skb = rx->skb, *skb2;
1012 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1013
1014 fc = rx->fc;
1015 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1016 return TXRX_CONTINUE;
1017
1018 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1019 return TXRX_DROP;
1020
1021 hdrlen = ieee80211_get_hdrlen(fc);
1022
1023 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1024 * header
1025 * IEEE 802.11 address fields:
1026 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1027 * 0 0 DA SA BSSID n/a
1028 * 0 1 DA BSSID SA n/a
1029 * 1 0 BSSID SA DA n/a
1030 * 1 1 RA TA DA SA
1031 */
1032
1033 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1034 case IEEE80211_FCTL_TODS:
1035 /* BSSID SA DA */
1036 memcpy(dst, hdr->addr3, ETH_ALEN);
1037 memcpy(src, hdr->addr2, ETH_ALEN);
1038
1039 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
1040 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
1041 if (net_ratelimit())
1042 printk(KERN_DEBUG "%s: dropped ToDS frame "
1043 "(BSSID=" MAC_FMT
1044 " SA=" MAC_FMT
1045 " DA=" MAC_FMT ")\n",
1046 dev->name,
1047 MAC_ARG(hdr->addr1),
1048 MAC_ARG(hdr->addr2),
1049 MAC_ARG(hdr->addr3));
1050 return TXRX_DROP;
1051 }
1052 break;
1053 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1054 /* RA TA DA SA */
1055 memcpy(dst, hdr->addr3, ETH_ALEN);
1056 memcpy(src, hdr->addr4, ETH_ALEN);
1057
1058 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
1059 if (net_ratelimit())
1060 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
1061 "frame (RA=" MAC_FMT
1062 " TA=" MAC_FMT " DA=" MAC_FMT
1063 " SA=" MAC_FMT ")\n",
1064 rx->dev->name,
1065 MAC_ARG(hdr->addr1),
1066 MAC_ARG(hdr->addr2),
1067 MAC_ARG(hdr->addr3),
1068 MAC_ARG(hdr->addr4));
1069 return TXRX_DROP;
1070 }
1071 break;
1072 case IEEE80211_FCTL_FROMDS:
1073 /* DA BSSID SA */
1074 memcpy(dst, hdr->addr1, ETH_ALEN);
1075 memcpy(src, hdr->addr3, ETH_ALEN);
1076
1077 if (sdata->type != IEEE80211_IF_TYPE_STA ||
1078 (is_multicast_ether_addr(dst) &&
1079 !compare_ether_addr(src, dev->dev_addr)))
1080 return TXRX_DROP;
1081 break;
1082 case 0:
1083 /* DA SA BSSID */
1084 memcpy(dst, hdr->addr1, ETH_ALEN);
1085 memcpy(src, hdr->addr2, ETH_ALEN);
1086
1087 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1088 if (net_ratelimit()) {
1089 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
1090 MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
1091 ")\n",
1092 dev->name, MAC_ARG(hdr->addr1),
1093 MAC_ARG(hdr->addr2),
1094 MAC_ARG(hdr->addr3));
1095 }
1096 return TXRX_DROP;
1097 }
1098 break;
1099 }
1100
1101 payload = skb->data + hdrlen;
1102
1103 if (unlikely(skb->len - hdrlen < 8)) {
1104 if (net_ratelimit()) {
1105 printk(KERN_DEBUG "%s: RX too short data frame "
1106 "payload\n", dev->name);
1107 }
1108 return TXRX_DROP;
1109 }
1110
1111 ethertype = (payload[6] << 8) | payload[7];
1112
1113 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1114 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1115 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1116 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1117 * replace EtherType */
1118 skb_pull(skb, hdrlen + 6);
1119 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1120 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1121 } else {
1122 struct ethhdr *ehdr;
1123 __be16 len;
1124 skb_pull(skb, hdrlen);
1125 len = htons(skb->len);
1126 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1127 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1128 memcpy(ehdr->h_source, src, ETH_ALEN);
1129 ehdr->h_proto = len;
1130 }
1131 skb->dev = dev;
1132
1133 skb2 = NULL;
1134
1135 dev->stats.rx_packets++;
1136 dev->stats.rx_bytes += skb->len;
1137
1138 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1139 || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1140 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
1141 if (is_multicast_ether_addr(skb->data)) {
1142 /* send multicast frames both to higher layers in
1143 * local net stack and back to the wireless media */
1144 skb2 = skb_copy(skb, GFP_ATOMIC);
1145 if (!skb2 && net_ratelimit())
1146 printk(KERN_DEBUG "%s: failed to clone "
1147 "multicast frame\n", dev->name);
1148 } else {
1149 struct sta_info *dsta;
1150 dsta = sta_info_get(local, skb->data);
1151 if (dsta && !dsta->dev) {
1152 if (net_ratelimit())
1153 printk(KERN_DEBUG "Station with null "
1154 "dev structure!\n");
1155 } else if (dsta && dsta->dev == dev) {
1156 /* Destination station is associated to this
1157 * AP, so send the frame directly to it and
1158 * do not pass the frame to local net stack.
1159 */
1160 skb2 = skb;
1161 skb = NULL;
1162 }
1163 if (dsta)
1164 sta_info_put(dsta);
1165 }
1166 }
1167
1168 if (skb) {
1169 /* deliver to local stack */
1170 skb->protocol = eth_type_trans(skb, dev);
1171 memset(skb->cb, 0, sizeof(skb->cb));
1172 netif_rx(skb);
1173 }
1174
1175 if (skb2) {
1176 /* send to wireless media */
1177 skb2->protocol = __constant_htons(ETH_P_802_3);
1178 skb_set_network_header(skb2, 0);
1179 skb_set_mac_header(skb2, 0);
1180 dev_queue_xmit(skb2);
1181 }
1182
1183 return TXRX_QUEUED;
1184 }
1185
1186 static ieee80211_txrx_result
1187 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1188 {
1189 struct ieee80211_sub_if_data *sdata;
1190
1191 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
1192 return TXRX_DROP;
1193
1194 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1195 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1196 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1197 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1198 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1199 else
1200 return TXRX_DROP;
1201
1202 return TXRX_QUEUED;
1203 }
1204
1205 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1206 struct ieee80211_local *local,
1207 ieee80211_rx_handler *handlers,
1208 struct ieee80211_txrx_data *rx,
1209 struct sta_info *sta)
1210 {
1211 ieee80211_rx_handler *handler;
1212 ieee80211_txrx_result res = TXRX_DROP;
1213
1214 for (handler = handlers; *handler != NULL; handler++) {
1215 res = (*handler)(rx);
1216
1217 switch (res) {
1218 case TXRX_CONTINUE:
1219 continue;
1220 case TXRX_DROP:
1221 I802_DEBUG_INC(local->rx_handlers_drop);
1222 if (sta)
1223 sta->rx_dropped++;
1224 break;
1225 case TXRX_QUEUED:
1226 I802_DEBUG_INC(local->rx_handlers_queued);
1227 break;
1228 }
1229 break;
1230 }
1231
1232 if (res == TXRX_DROP)
1233 dev_kfree_skb(rx->skb);
1234 return res;
1235 }
1236
1237 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1238 ieee80211_rx_handler *handlers,
1239 struct ieee80211_txrx_data *rx,
1240 struct sta_info *sta)
1241 {
1242 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1243 TXRX_CONTINUE)
1244 dev_kfree_skb(rx->skb);
1245 }
1246
1247 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1248 struct ieee80211_hdr *hdr,
1249 struct sta_info *sta,
1250 struct ieee80211_txrx_data *rx)
1251 {
1252 int keyidx, hdrlen;
1253
1254 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1255 if (rx->skb->len >= hdrlen + 4)
1256 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1257 else
1258 keyidx = -1;
1259
1260 if (net_ratelimit())
1261 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1262 "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
1263 dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1),
1264 keyidx);
1265
1266 if (!sta) {
1267 /*
1268 * Some hardware seem to generate incorrect Michael MIC
1269 * reports; ignore them to avoid triggering countermeasures.
1270 */
1271 if (net_ratelimit())
1272 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1273 "error for unknown address " MAC_FMT "\n",
1274 dev->name, MAC_ARG(hdr->addr2));
1275 goto ignore;
1276 }
1277
1278 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1279 if (net_ratelimit())
1280 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1281 "error for a frame with no PROTECTED flag (src "
1282 MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
1283 goto ignore;
1284 }
1285
1286 if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
1287 /*
1288 * APs with pairwise keys should never receive Michael MIC
1289 * errors for non-zero keyidx because these are reserved for
1290 * group keys and only the AP is sending real multicast
1291 * frames in the BSS.
1292 */
1293 if (net_ratelimit())
1294 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1295 "a frame with non-zero keyidx (%d)"
1296 " (src " MAC_FMT ")\n", dev->name, keyidx,
1297 MAC_ARG(hdr->addr2));
1298 goto ignore;
1299 }
1300
1301 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1302 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1303 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1304 if (net_ratelimit())
1305 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1306 "error for a frame that cannot be encrypted "
1307 "(fc=0x%04x) (src " MAC_FMT ")\n",
1308 dev->name, rx->fc, MAC_ARG(hdr->addr2));
1309 goto ignore;
1310 }
1311
1312 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1313 ignore:
1314 dev_kfree_skb(rx->skb);
1315 rx->skb = NULL;
1316 }
1317
1318 ieee80211_rx_handler ieee80211_rx_handlers[] =
1319 {
1320 ieee80211_rx_h_if_stats,
1321 ieee80211_rx_h_passive_scan,
1322 ieee80211_rx_h_check,
1323 ieee80211_rx_h_decrypt,
1324 ieee80211_rx_h_sta_process,
1325 ieee80211_rx_h_defragment,
1326 ieee80211_rx_h_ps_poll,
1327 ieee80211_rx_h_michael_mic_verify,
1328 /* this must be after decryption - so header is counted in MPDU mic
1329 * must be before pae and data, so QOS_DATA format frames
1330 * are not passed to user space by these functions
1331 */
1332 ieee80211_rx_h_remove_qos_control,
1333 ieee80211_rx_h_802_1x_pae,
1334 ieee80211_rx_h_drop_unencrypted,
1335 ieee80211_rx_h_data,
1336 ieee80211_rx_h_mgmt,
1337 NULL
1338 };
1339
1340 /* main receive path */
1341
1342 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1343 u8 *bssid, struct ieee80211_txrx_data *rx,
1344 struct ieee80211_hdr *hdr)
1345 {
1346 int multicast = is_multicast_ether_addr(hdr->addr1);
1347
1348 switch (sdata->type) {
1349 case IEEE80211_IF_TYPE_STA:
1350 if (!bssid)
1351 return 0;
1352 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1353 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1354 return 0;
1355 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1356 } else if (!multicast &&
1357 compare_ether_addr(sdata->dev->dev_addr,
1358 hdr->addr1) != 0) {
1359 if (!(sdata->dev->flags & IFF_PROMISC))
1360 return 0;
1361 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1362 }
1363 break;
1364 case IEEE80211_IF_TYPE_IBSS:
1365 if (!bssid)
1366 return 0;
1367 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1368 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1369 return 0;
1370 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1371 } else if (!multicast &&
1372 compare_ether_addr(sdata->dev->dev_addr,
1373 hdr->addr1) != 0) {
1374 if (!(sdata->dev->flags & IFF_PROMISC))
1375 return 0;
1376 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1377 } else if (!rx->sta)
1378 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1379 bssid, hdr->addr2);
1380 break;
1381 case IEEE80211_IF_TYPE_VLAN:
1382 case IEEE80211_IF_TYPE_AP:
1383 if (!bssid) {
1384 if (compare_ether_addr(sdata->dev->dev_addr,
1385 hdr->addr1))
1386 return 0;
1387 } else if (!ieee80211_bssid_match(bssid,
1388 sdata->dev->dev_addr)) {
1389 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1390 return 0;
1391 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1392 }
1393 if (sdata->dev == sdata->local->mdev &&
1394 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1395 /* do not receive anything via
1396 * master device when not scanning */
1397 return 0;
1398 break;
1399 case IEEE80211_IF_TYPE_WDS:
1400 if (bssid ||
1401 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1402 return 0;
1403 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1404 return 0;
1405 break;
1406 case IEEE80211_IF_TYPE_MNTR:
1407 /* take everything */
1408 break;
1409 case IEEE80211_IF_TYPE_INVALID:
1410 /* should never get here */
1411 WARN_ON(1);
1412 break;
1413 }
1414
1415 return 1;
1416 }
1417
1418 /*
1419 * This is the receive path handler. It is called by a low level driver when an
1420 * 802.11 MPDU is received from the hardware.
1421 */
1422 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1423 struct ieee80211_rx_status *status)
1424 {
1425 struct ieee80211_local *local = hw_to_local(hw);
1426 struct ieee80211_sub_if_data *sdata;
1427 struct sta_info *sta;
1428 struct ieee80211_hdr *hdr;
1429 struct ieee80211_txrx_data rx;
1430 u16 type;
1431 int prepres;
1432 struct ieee80211_sub_if_data *prev = NULL;
1433 struct sk_buff *skb_new;
1434 u8 *bssid;
1435
1436 /*
1437 * key references and virtual interfaces are protected using RCU
1438 * and this requires that we are in a read-side RCU section during
1439 * receive processing
1440 */
1441 rcu_read_lock();
1442
1443 /*
1444 * Frames with failed FCS/PLCP checksum are not returned,
1445 * all other frames are returned without radiotap header
1446 * if it was previously present.
1447 * Also, frames with less than 16 bytes are dropped.
1448 */
1449 skb = ieee80211_rx_monitor(local, skb, status);
1450 if (!skb) {
1451 rcu_read_unlock();
1452 return;
1453 }
1454
1455 hdr = (struct ieee80211_hdr *) skb->data;
1456 memset(&rx, 0, sizeof(rx));
1457 rx.skb = skb;
1458 rx.local = local;
1459
1460 rx.u.rx.status = status;
1461 rx.fc = le16_to_cpu(hdr->frame_control);
1462 type = rx.fc & IEEE80211_FCTL_FTYPE;
1463
1464 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1465 local->dot11ReceivedFragmentCount++;
1466
1467 sta = rx.sta = sta_info_get(local, hdr->addr2);
1468 if (sta) {
1469 rx.dev = rx.sta->dev;
1470 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1471 }
1472
1473 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1474 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1475 goto end;
1476 }
1477
1478 if (unlikely(local->sta_scanning))
1479 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1480
1481 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1482 sta) != TXRX_CONTINUE)
1483 goto end;
1484 skb = rx.skb;
1485
1486 if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
1487 !atomic_read(&local->iff_promiscs) &&
1488 !is_multicast_ether_addr(hdr->addr1)) {
1489 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1490 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1491 rx.sta);
1492 sta_info_put(sta);
1493 rcu_read_unlock();
1494 return;
1495 }
1496
1497 bssid = ieee80211_get_bssid(hdr, skb->len);
1498
1499 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1500 if (!netif_running(sdata->dev))
1501 continue;
1502
1503 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
1504 continue;
1505
1506 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1507 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1508 /* prepare_for_handlers can change sta */
1509 sta = rx.sta;
1510
1511 if (!prepres)
1512 continue;
1513
1514 /*
1515 * frame is destined for this interface, but if it's not
1516 * also for the previous one we handle that after the
1517 * loop to avoid copying the SKB once too much
1518 */
1519
1520 if (!prev) {
1521 prev = sdata;
1522 continue;
1523 }
1524
1525 /*
1526 * frame was destined for the previous interface
1527 * so invoke RX handlers for it
1528 */
1529
1530 skb_new = skb_copy(skb, GFP_ATOMIC);
1531 if (!skb_new) {
1532 if (net_ratelimit())
1533 printk(KERN_DEBUG "%s: failed to copy "
1534 "multicast frame for %s",
1535 wiphy_name(local->hw.wiphy),
1536 prev->dev->name);
1537 continue;
1538 }
1539 rx.skb = skb_new;
1540 rx.dev = prev->dev;
1541 rx.sdata = prev;
1542 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1543 &rx, sta);
1544 prev = sdata;
1545 }
1546 if (prev) {
1547 rx.skb = skb;
1548 rx.dev = prev->dev;
1549 rx.sdata = prev;
1550 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1551 &rx, sta);
1552 } else
1553 dev_kfree_skb(skb);
1554
1555 end:
1556 rcu_read_unlock();
1557
1558 if (sta)
1559 sta_info_put(sta);
1560 }
1561 EXPORT_SYMBOL(__ieee80211_rx);
1562
1563 /* This is a version of the rx handler that can be called from hard irq
1564 * context. Post the skb on the queue and schedule the tasklet */
1565 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1566 struct ieee80211_rx_status *status)
1567 {
1568 struct ieee80211_local *local = hw_to_local(hw);
1569
1570 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1571
1572 skb->dev = local->mdev;
1573 /* copy status into skb->cb for use by tasklet */
1574 memcpy(skb->cb, status, sizeof(*status));
1575 skb->pkt_type = IEEE80211_RX_MSG;
1576 skb_queue_tail(&local->skb_queue, skb);
1577 tasklet_schedule(&local->tasklet);
1578 }
1579 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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