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sh: ubc wakeup for SH-4 only.
[firewire-audio.git] / net / mac80211 / rx.c
blobece77766ea2bd798552152b67313e8c86ae0aa1c
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 DECLARE_MAC_BUF(mac);
548
549 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
550
551 if (sdata->bss)
552 atomic_inc(&sdata->bss->num_sta_ps);
553 sta->flags |= WLAN_STA_PS;
554 sta->pspoll = 0;
555 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
556 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
557 dev->name, print_mac(mac, sta->addr), sta->aid);
558 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
559 }
560
561 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
562 {
563 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
564 struct sk_buff *skb;
565 int sent = 0;
566 struct ieee80211_sub_if_data *sdata;
567 struct ieee80211_tx_packet_data *pkt_data;
568 DECLARE_MAC_BUF(mac);
569
570 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
571 if (sdata->bss)
572 atomic_dec(&sdata->bss->num_sta_ps);
573 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
574 sta->pspoll = 0;
575 if (!skb_queue_empty(&sta->ps_tx_buf)) {
576 if (local->ops->set_tim)
577 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
578 if (sdata->bss)
579 bss_tim_clear(local, sdata->bss, sta->aid);
580 }
581 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
582 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
583 dev->name, print_mac(mac, sta->addr), sta->aid);
584 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
585 /* Send all buffered frames to the station */
586 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
587 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
588 sent++;
589 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
590 dev_queue_xmit(skb);
591 }
592 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
593 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
594 local->total_ps_buffered--;
595 sent++;
596 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
597 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
598 "since STA not sleeping anymore\n", dev->name,
599 print_mac(mac, sta->addr), sta->aid);
600 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
601 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
602 dev_queue_xmit(skb);
603 }
604
605 return sent;
606 }
607
608 static ieee80211_txrx_result
609 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
610 {
611 struct sta_info *sta = rx->sta;
612 struct net_device *dev = rx->dev;
613 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
614
615 if (!sta)
616 return TXRX_CONTINUE;
617
618 /* Update last_rx only for IBSS packets which are for the current
619 * BSSID to avoid keeping the current IBSS network alive in cases where
620 * other STAs are using different BSSID. */
621 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
622 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
623 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
624 sta->last_rx = jiffies;
625 } else
626 if (!is_multicast_ether_addr(hdr->addr1) ||
627 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
628 /* Update last_rx only for unicast frames in order to prevent
629 * the Probe Request frames (the only broadcast frames from a
630 * STA in infrastructure mode) from keeping a connection alive.
631 */
632 sta->last_rx = jiffies;
633 }
634
635 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
636 return TXRX_CONTINUE;
637
638 sta->rx_fragments++;
639 sta->rx_bytes += rx->skb->len;
640 sta->last_rssi = rx->u.rx.status->ssi;
641 sta->last_signal = rx->u.rx.status->signal;
642 sta->last_noise = rx->u.rx.status->noise;
643
644 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
645 /* Change STA power saving mode only in the end of a frame
646 * exchange sequence */
647 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
648 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
649 else if (!(sta->flags & WLAN_STA_PS) &&
650 (rx->fc & IEEE80211_FCTL_PM))
651 ap_sta_ps_start(dev, sta);
652 }
653
654 /* Drop data::nullfunc frames silently, since they are used only to
655 * control station power saving mode. */
656 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
657 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
658 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
659 /* Update counter and free packet here to avoid counting this
660 * as a dropped packed. */
661 sta->rx_packets++;
662 dev_kfree_skb(rx->skb);
663 return TXRX_QUEUED;
664 }
665
666 return TXRX_CONTINUE;
667 } /* ieee80211_rx_h_sta_process */
668
669 static inline struct ieee80211_fragment_entry *
670 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
671 unsigned int frag, unsigned int seq, int rx_queue,
672 struct sk_buff **skb)
673 {
674 struct ieee80211_fragment_entry *entry;
675 int idx;
676
677 idx = sdata->fragment_next;
678 entry = &sdata->fragments[sdata->fragment_next++];
679 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
680 sdata->fragment_next = 0;
681
682 if (!skb_queue_empty(&entry->skb_list)) {
683 #ifdef CONFIG_MAC80211_DEBUG
684 struct ieee80211_hdr *hdr =
685 (struct ieee80211_hdr *) entry->skb_list.next->data;
686 DECLARE_MAC_BUF(mac);
687 DECLARE_MAC_BUF(mac2);
688 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
689 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
690 "addr1=%s addr2=%s\n",
691 sdata->dev->name, idx,
692 jiffies - entry->first_frag_time, entry->seq,
693 entry->last_frag, print_mac(mac, hdr->addr1),
694 print_mac(mac2, hdr->addr2));
695 #endif /* CONFIG_MAC80211_DEBUG */
696 __skb_queue_purge(&entry->skb_list);
697 }
698
699 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
700 *skb = NULL;
701 entry->first_frag_time = jiffies;
702 entry->seq = seq;
703 entry->rx_queue = rx_queue;
704 entry->last_frag = frag;
705 entry->ccmp = 0;
706 entry->extra_len = 0;
707
708 return entry;
709 }
710
711 static inline struct ieee80211_fragment_entry *
712 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
713 u16 fc, unsigned int frag, unsigned int seq,
714 int rx_queue, struct ieee80211_hdr *hdr)
715 {
716 struct ieee80211_fragment_entry *entry;
717 int i, idx;
718
719 idx = sdata->fragment_next;
720 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
721 struct ieee80211_hdr *f_hdr;
722 u16 f_fc;
723
724 idx--;
725 if (idx < 0)
726 idx = IEEE80211_FRAGMENT_MAX - 1;
727
728 entry = &sdata->fragments[idx];
729 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
730 entry->rx_queue != rx_queue ||
731 entry->last_frag + 1 != frag)
732 continue;
733
734 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
735 f_fc = le16_to_cpu(f_hdr->frame_control);
736
737 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
738 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
739 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
740 continue;
741
742 if (entry->first_frag_time + 2 * HZ < jiffies) {
743 __skb_queue_purge(&entry->skb_list);
744 continue;
745 }
746 return entry;
747 }
748
749 return NULL;
750 }
751
752 static ieee80211_txrx_result
753 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
754 {
755 struct ieee80211_hdr *hdr;
756 u16 sc;
757 unsigned int frag, seq;
758 struct ieee80211_fragment_entry *entry;
759 struct sk_buff *skb;
760 DECLARE_MAC_BUF(mac);
761
762 hdr = (struct ieee80211_hdr *) rx->skb->data;
763 sc = le16_to_cpu(hdr->seq_ctrl);
764 frag = sc & IEEE80211_SCTL_FRAG;
765
766 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
767 (rx->skb)->len < 24 ||
768 is_multicast_ether_addr(hdr->addr1))) {
769 /* not fragmented */
770 goto out;
771 }
772 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
773
774 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
775
776 if (frag == 0) {
777 /* This is the first fragment of a new frame. */
778 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
779 rx->u.rx.queue, &(rx->skb));
780 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
781 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
782 /* Store CCMP PN so that we can verify that the next
783 * fragment has a sequential PN value. */
784 entry->ccmp = 1;
785 memcpy(entry->last_pn,
786 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
787 CCMP_PN_LEN);
788 }
789 return TXRX_QUEUED;
790 }
791
792 /* This is a fragment for a frame that should already be pending in
793 * fragment cache. Add this fragment to the end of the pending entry.
794 */
795 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
796 rx->u.rx.queue, hdr);
797 if (!entry) {
798 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
799 return TXRX_DROP;
800 }
801
802 /* Verify that MPDUs within one MSDU have sequential PN values.
803 * (IEEE 802.11i, 8.3.3.4.5) */
804 if (entry->ccmp) {
805 int i;
806 u8 pn[CCMP_PN_LEN], *rpn;
807 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
808 return TXRX_DROP;
809 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
810 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
811 pn[i]++;
812 if (pn[i])
813 break;
814 }
815 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
816 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
817 if (net_ratelimit())
818 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
819 "sequential A2=%s"
820 " PN=%02x%02x%02x%02x%02x%02x "
821 "(expected %02x%02x%02x%02x%02x%02x)\n",
822 rx->dev->name, print_mac(mac, hdr->addr2),
823 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
824 rpn[5], pn[0], pn[1], pn[2], pn[3],
825 pn[4], pn[5]);
826 return TXRX_DROP;
827 }
828 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
829 }
830
831 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
832 __skb_queue_tail(&entry->skb_list, rx->skb);
833 entry->last_frag = frag;
834 entry->extra_len += rx->skb->len;
835 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
836 rx->skb = NULL;
837 return TXRX_QUEUED;
838 }
839
840 rx->skb = __skb_dequeue(&entry->skb_list);
841 if (skb_tailroom(rx->skb) < entry->extra_len) {
842 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
843 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
844 GFP_ATOMIC))) {
845 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
846 __skb_queue_purge(&entry->skb_list);
847 return TXRX_DROP;
848 }
849 }
850 while ((skb = __skb_dequeue(&entry->skb_list))) {
851 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
852 dev_kfree_skb(skb);
853 }
854
855 /* Complete frame has been reassembled - process it now */
856 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
857
858 out:
859 if (rx->sta)
860 rx->sta->rx_packets++;
861 if (is_multicast_ether_addr(hdr->addr1))
862 rx->local->dot11MulticastReceivedFrameCount++;
863 else
864 ieee80211_led_rx(rx->local);
865 return TXRX_CONTINUE;
866 }
867
868 static ieee80211_txrx_result
869 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
870 {
871 struct sk_buff *skb;
872 int no_pending_pkts;
873 DECLARE_MAC_BUF(mac);
874
875 if (likely(!rx->sta ||
876 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
877 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
878 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
879 return TXRX_CONTINUE;
880
881 skb = skb_dequeue(&rx->sta->tx_filtered);
882 if (!skb) {
883 skb = skb_dequeue(&rx->sta->ps_tx_buf);
884 if (skb)
885 rx->local->total_ps_buffered--;
886 }
887 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
888 skb_queue_empty(&rx->sta->ps_tx_buf);
889
890 if (skb) {
891 struct ieee80211_hdr *hdr =
892 (struct ieee80211_hdr *) skb->data;
893
894 /* tell TX path to send one frame even though the STA may
895 * still remain is PS mode after this frame exchange */
896 rx->sta->pspoll = 1;
897
898 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
899 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
900 print_mac(mac, rx->sta->addr), rx->sta->aid,
901 skb_queue_len(&rx->sta->ps_tx_buf));
902 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
903
904 /* Use MoreData flag to indicate whether there are more
905 * buffered frames for this STA */
906 if (no_pending_pkts) {
907 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
908 rx->sta->flags &= ~WLAN_STA_TIM;
909 } else
910 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
911
912 dev_queue_xmit(skb);
913
914 if (no_pending_pkts) {
915 if (rx->local->ops->set_tim)
916 rx->local->ops->set_tim(local_to_hw(rx->local),
917 rx->sta->aid, 0);
918 if (rx->sdata->bss)
919 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
920 }
921 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
922 } else if (!rx->u.rx.sent_ps_buffered) {
923 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
924 "though there is no buffered frames for it\n",
925 rx->dev->name, print_mac(mac, rx->sta->addr));
926 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
927
928 }
929
930 /* Free PS Poll skb here instead of returning TXRX_DROP that would
931 * count as an dropped frame. */
932 dev_kfree_skb(rx->skb);
933
934 return TXRX_QUEUED;
935 }
936
937 static ieee80211_txrx_result
938 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
939 {
940 u16 fc = rx->fc;
941 u8 *data = rx->skb->data;
942 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
943
944 if (!WLAN_FC_IS_QOS_DATA(fc))
945 return TXRX_CONTINUE;
946
947 /* remove the qos control field, update frame type and meta-data */
948 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
949 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
950 /* change frame type to non QOS */
951 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
952 hdr->frame_control = cpu_to_le16(fc);
953
954 return TXRX_CONTINUE;
955 }
956
957 static ieee80211_txrx_result
958 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
959 {
960 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
961 rx->sdata->type != IEEE80211_IF_TYPE_STA &&
962 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
963 return TXRX_CONTINUE;
964
965 if (unlikely(rx->sdata->ieee802_1x &&
966 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
967 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
968 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
969 !ieee80211_is_eapol(rx->skb))) {
970 #ifdef CONFIG_MAC80211_DEBUG
971 struct ieee80211_hdr *hdr =
972 (struct ieee80211_hdr *) rx->skb->data;
973 DECLARE_MAC_BUF(mac);
974 printk(KERN_DEBUG "%s: dropped frame from %s"
975 " (unauthorized port)\n", rx->dev->name,
976 print_mac(mac, hdr->addr2));
977 #endif /* CONFIG_MAC80211_DEBUG */
978 return TXRX_DROP;
979 }
980
981 return TXRX_CONTINUE;
982 }
983
984 static ieee80211_txrx_result
985 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
986 {
987 /*
988 * Pass through unencrypted frames if the hardware has
989 * decrypted them already.
990 */
991 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
992 return TXRX_CONTINUE;
993
994 /* Drop unencrypted frames if key is set. */
995 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
996 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
997 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
998 rx->sdata->drop_unencrypted &&
999 (rx->sdata->eapol == 0 || !ieee80211_is_eapol(rx->skb)))) {
1000 if (net_ratelimit())
1001 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
1002 "encryption\n", rx->dev->name);
1003 return TXRX_DROP;
1004 }
1005 return TXRX_CONTINUE;
1006 }
1007
1008 static ieee80211_txrx_result
1009 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
1010 {
1011 struct net_device *dev = rx->dev;
1012 struct ieee80211_local *local = rx->local;
1013 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1014 u16 fc, hdrlen, ethertype;
1015 u8 *payload;
1016 u8 dst[ETH_ALEN];
1017 u8 src[ETH_ALEN];
1018 struct sk_buff *skb = rx->skb, *skb2;
1019 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1020 DECLARE_MAC_BUF(mac);
1021 DECLARE_MAC_BUF(mac2);
1022 DECLARE_MAC_BUF(mac3);
1023 DECLARE_MAC_BUF(mac4);
1024
1025 fc = rx->fc;
1026 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1027 return TXRX_CONTINUE;
1028
1029 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1030 return TXRX_DROP;
1031
1032 hdrlen = ieee80211_get_hdrlen(fc);
1033
1034 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1035 * header
1036 * IEEE 802.11 address fields:
1037 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1038 * 0 0 DA SA BSSID n/a
1039 * 0 1 DA BSSID SA n/a
1040 * 1 0 BSSID SA DA n/a
1041 * 1 1 RA TA DA SA
1042 */
1043
1044 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1045 case IEEE80211_FCTL_TODS:
1046 /* BSSID SA DA */
1047 memcpy(dst, hdr->addr3, ETH_ALEN);
1048 memcpy(src, hdr->addr2, ETH_ALEN);
1049
1050 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
1051 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
1052 if (net_ratelimit())
1053 printk(KERN_DEBUG "%s: dropped ToDS frame "
1054 "(BSSID=%s SA=%s DA=%s)\n",
1055 dev->name,
1056 print_mac(mac, hdr->addr1),
1057 print_mac(mac2, hdr->addr2),
1058 print_mac(mac3, hdr->addr3));
1059 return TXRX_DROP;
1060 }
1061 break;
1062 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1063 /* RA TA DA SA */
1064 memcpy(dst, hdr->addr3, ETH_ALEN);
1065 memcpy(src, hdr->addr4, ETH_ALEN);
1066
1067 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
1068 if (net_ratelimit())
1069 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
1070 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1071 rx->dev->name,
1072 print_mac(mac, hdr->addr1),
1073 print_mac(mac2, hdr->addr2),
1074 print_mac(mac3, hdr->addr3),
1075 print_mac(mac4, hdr->addr4));
1076 return TXRX_DROP;
1077 }
1078 break;
1079 case IEEE80211_FCTL_FROMDS:
1080 /* DA BSSID SA */
1081 memcpy(dst, hdr->addr1, ETH_ALEN);
1082 memcpy(src, hdr->addr3, ETH_ALEN);
1083
1084 if (sdata->type != IEEE80211_IF_TYPE_STA ||
1085 (is_multicast_ether_addr(dst) &&
1086 !compare_ether_addr(src, dev->dev_addr)))
1087 return TXRX_DROP;
1088 break;
1089 case 0:
1090 /* DA SA BSSID */
1091 memcpy(dst, hdr->addr1, ETH_ALEN);
1092 memcpy(src, hdr->addr2, ETH_ALEN);
1093
1094 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1095 if (net_ratelimit()) {
1096 printk(KERN_DEBUG "%s: dropped IBSS frame "
1097 "(DA=%s SA=%s BSSID=%s)\n",
1098 dev->name,
1099 print_mac(mac, hdr->addr1),
1100 print_mac(mac2, hdr->addr2),
1101 print_mac(mac3, hdr->addr3));
1102 }
1103 return TXRX_DROP;
1104 }
1105 break;
1106 }
1107
1108 payload = skb->data + hdrlen;
1109
1110 if (unlikely(skb->len - hdrlen < 8)) {
1111 if (net_ratelimit()) {
1112 printk(KERN_DEBUG "%s: RX too short data frame "
1113 "payload\n", dev->name);
1114 }
1115 return TXRX_DROP;
1116 }
1117
1118 ethertype = (payload[6] << 8) | payload[7];
1119
1120 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1121 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1122 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1123 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1124 * replace EtherType */
1125 skb_pull(skb, hdrlen + 6);
1126 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1127 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1128 } else {
1129 struct ethhdr *ehdr;
1130 __be16 len;
1131 skb_pull(skb, hdrlen);
1132 len = htons(skb->len);
1133 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1134 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1135 memcpy(ehdr->h_source, src, ETH_ALEN);
1136 ehdr->h_proto = len;
1137 }
1138 skb->dev = dev;
1139
1140 skb2 = NULL;
1141
1142 dev->stats.rx_packets++;
1143 dev->stats.rx_bytes += skb->len;
1144
1145 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1146 || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1147 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
1148 if (is_multicast_ether_addr(skb->data)) {
1149 /* send multicast frames both to higher layers in
1150 * local net stack and back to the wireless media */
1151 skb2 = skb_copy(skb, GFP_ATOMIC);
1152 if (!skb2 && net_ratelimit())
1153 printk(KERN_DEBUG "%s: failed to clone "
1154 "multicast frame\n", dev->name);
1155 } else {
1156 struct sta_info *dsta;
1157 dsta = sta_info_get(local, skb->data);
1158 if (dsta && !dsta->dev) {
1159 if (net_ratelimit())
1160 printk(KERN_DEBUG "Station with null "
1161 "dev structure!\n");
1162 } else if (dsta && dsta->dev == dev) {
1163 /* Destination station is associated to this
1164 * AP, so send the frame directly to it and
1165 * do not pass the frame to local net stack.
1166 */
1167 skb2 = skb;
1168 skb = NULL;
1169 }
1170 if (dsta)
1171 sta_info_put(dsta);
1172 }
1173 }
1174
1175 if (skb) {
1176 /* deliver to local stack */
1177 skb->protocol = eth_type_trans(skb, dev);
1178 memset(skb->cb, 0, sizeof(skb->cb));
1179 netif_rx(skb);
1180 }
1181
1182 if (skb2) {
1183 /* send to wireless media */
1184 skb2->protocol = __constant_htons(ETH_P_802_3);
1185 skb_set_network_header(skb2, 0);
1186 skb_set_mac_header(skb2, 0);
1187 dev_queue_xmit(skb2);
1188 }
1189
1190 return TXRX_QUEUED;
1191 }
1192
1193 static ieee80211_txrx_result
1194 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1195 {
1196 struct ieee80211_sub_if_data *sdata;
1197
1198 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
1199 return TXRX_DROP;
1200
1201 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1202 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1203 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1204 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1205 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1206 else
1207 return TXRX_DROP;
1208
1209 return TXRX_QUEUED;
1210 }
1211
1212 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1213 struct ieee80211_local *local,
1214 ieee80211_rx_handler *handlers,
1215 struct ieee80211_txrx_data *rx,
1216 struct sta_info *sta)
1217 {
1218 ieee80211_rx_handler *handler;
1219 ieee80211_txrx_result res = TXRX_DROP;
1220
1221 for (handler = handlers; *handler != NULL; handler++) {
1222 res = (*handler)(rx);
1223
1224 switch (res) {
1225 case TXRX_CONTINUE:
1226 continue;
1227 case TXRX_DROP:
1228 I802_DEBUG_INC(local->rx_handlers_drop);
1229 if (sta)
1230 sta->rx_dropped++;
1231 break;
1232 case TXRX_QUEUED:
1233 I802_DEBUG_INC(local->rx_handlers_queued);
1234 break;
1235 }
1236 break;
1237 }
1238
1239 if (res == TXRX_DROP)
1240 dev_kfree_skb(rx->skb);
1241 return res;
1242 }
1243
1244 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1245 ieee80211_rx_handler *handlers,
1246 struct ieee80211_txrx_data *rx,
1247 struct sta_info *sta)
1248 {
1249 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1250 TXRX_CONTINUE)
1251 dev_kfree_skb(rx->skb);
1252 }
1253
1254 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1255 struct ieee80211_hdr *hdr,
1256 struct sta_info *sta,
1257 struct ieee80211_txrx_data *rx)
1258 {
1259 int keyidx, hdrlen;
1260 DECLARE_MAC_BUF(mac);
1261 DECLARE_MAC_BUF(mac2);
1262
1263 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1264 if (rx->skb->len >= hdrlen + 4)
1265 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1266 else
1267 keyidx = -1;
1268
1269 if (net_ratelimit())
1270 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1271 "failure from %s to %s keyidx=%d\n",
1272 dev->name, print_mac(mac, hdr->addr2),
1273 print_mac(mac2, hdr->addr1), keyidx);
1274
1275 if (!sta) {
1276 /*
1277 * Some hardware seem to generate incorrect Michael MIC
1278 * reports; ignore them to avoid triggering countermeasures.
1279 */
1280 if (net_ratelimit())
1281 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1282 "error for unknown address %s\n",
1283 dev->name, print_mac(mac, hdr->addr2));
1284 goto ignore;
1285 }
1286
1287 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1288 if (net_ratelimit())
1289 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1290 "error for a frame with no PROTECTED flag (src "
1291 "%s)\n", dev->name, print_mac(mac, hdr->addr2));
1292 goto ignore;
1293 }
1294
1295 if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
1296 /*
1297 * APs with pairwise keys should never receive Michael MIC
1298 * errors for non-zero keyidx because these are reserved for
1299 * group keys and only the AP is sending real multicast
1300 * frames in the BSS.
1301 */
1302 if (net_ratelimit())
1303 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1304 "a frame with non-zero keyidx (%d)"
1305 " (src %s)\n", dev->name, keyidx,
1306 print_mac(mac, hdr->addr2));
1307 goto ignore;
1308 }
1309
1310 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1311 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1312 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1313 if (net_ratelimit())
1314 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1315 "error for a frame that cannot be encrypted "
1316 "(fc=0x%04x) (src %s)\n",
1317 dev->name, rx->fc, print_mac(mac, hdr->addr2));
1318 goto ignore;
1319 }
1320
1321 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1322 ignore:
1323 dev_kfree_skb(rx->skb);
1324 rx->skb = NULL;
1325 }
1326
1327 ieee80211_rx_handler ieee80211_rx_handlers[] =
1328 {
1329 ieee80211_rx_h_if_stats,
1330 ieee80211_rx_h_passive_scan,
1331 ieee80211_rx_h_check,
1332 ieee80211_rx_h_decrypt,
1333 ieee80211_rx_h_sta_process,
1334 ieee80211_rx_h_defragment,
1335 ieee80211_rx_h_ps_poll,
1336 ieee80211_rx_h_michael_mic_verify,
1337 /* this must be after decryption - so header is counted in MPDU mic
1338 * must be before pae and data, so QOS_DATA format frames
1339 * are not passed to user space by these functions
1340 */
1341 ieee80211_rx_h_remove_qos_control,
1342 ieee80211_rx_h_802_1x_pae,
1343 ieee80211_rx_h_drop_unencrypted,
1344 ieee80211_rx_h_data,
1345 ieee80211_rx_h_mgmt,
1346 NULL
1347 };
1348
1349 /* main receive path */
1350
1351 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1352 u8 *bssid, struct ieee80211_txrx_data *rx,
1353 struct ieee80211_hdr *hdr)
1354 {
1355 int multicast = is_multicast_ether_addr(hdr->addr1);
1356
1357 switch (sdata->type) {
1358 case IEEE80211_IF_TYPE_STA:
1359 if (!bssid)
1360 return 0;
1361 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1362 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1363 return 0;
1364 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1365 } else if (!multicast &&
1366 compare_ether_addr(sdata->dev->dev_addr,
1367 hdr->addr1) != 0) {
1368 if (!(sdata->dev->flags & IFF_PROMISC))
1369 return 0;
1370 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1371 }
1372 break;
1373 case IEEE80211_IF_TYPE_IBSS:
1374 if (!bssid)
1375 return 0;
1376 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1377 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1378 return 0;
1379 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1380 } else if (!multicast &&
1381 compare_ether_addr(sdata->dev->dev_addr,
1382 hdr->addr1) != 0) {
1383 if (!(sdata->dev->flags & IFF_PROMISC))
1384 return 0;
1385 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1386 } else if (!rx->sta)
1387 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1388 bssid, hdr->addr2);
1389 break;
1390 case IEEE80211_IF_TYPE_VLAN:
1391 case IEEE80211_IF_TYPE_AP:
1392 if (!bssid) {
1393 if (compare_ether_addr(sdata->dev->dev_addr,
1394 hdr->addr1))
1395 return 0;
1396 } else if (!ieee80211_bssid_match(bssid,
1397 sdata->dev->dev_addr)) {
1398 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1399 return 0;
1400 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1401 }
1402 if (sdata->dev == sdata->local->mdev &&
1403 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1404 /* do not receive anything via
1405 * master device when not scanning */
1406 return 0;
1407 break;
1408 case IEEE80211_IF_TYPE_WDS:
1409 if (bssid ||
1410 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1411 return 0;
1412 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1413 return 0;
1414 break;
1415 case IEEE80211_IF_TYPE_MNTR:
1416 /* take everything */
1417 break;
1418 case IEEE80211_IF_TYPE_INVALID:
1419 /* should never get here */
1420 WARN_ON(1);
1421 break;
1422 }
1423
1424 return 1;
1425 }
1426
1427 /*
1428 * This is the receive path handler. It is called by a low level driver when an
1429 * 802.11 MPDU is received from the hardware.
1430 */
1431 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1432 struct ieee80211_rx_status *status)
1433 {
1434 struct ieee80211_local *local = hw_to_local(hw);
1435 struct ieee80211_sub_if_data *sdata;
1436 struct sta_info *sta;
1437 struct ieee80211_hdr *hdr;
1438 struct ieee80211_txrx_data rx;
1439 u16 type;
1440 int prepres;
1441 struct ieee80211_sub_if_data *prev = NULL;
1442 struct sk_buff *skb_new;
1443 u8 *bssid;
1444
1445 /*
1446 * key references and virtual interfaces are protected using RCU
1447 * and this requires that we are in a read-side RCU section during
1448 * receive processing
1449 */
1450 rcu_read_lock();
1451
1452 /*
1453 * Frames with failed FCS/PLCP checksum are not returned,
1454 * all other frames are returned without radiotap header
1455 * if it was previously present.
1456 * Also, frames with less than 16 bytes are dropped.
1457 */
1458 skb = ieee80211_rx_monitor(local, skb, status);
1459 if (!skb) {
1460 rcu_read_unlock();
1461 return;
1462 }
1463
1464 hdr = (struct ieee80211_hdr *) skb->data;
1465 memset(&rx, 0, sizeof(rx));
1466 rx.skb = skb;
1467 rx.local = local;
1468
1469 rx.u.rx.status = status;
1470 rx.fc = le16_to_cpu(hdr->frame_control);
1471 type = rx.fc & IEEE80211_FCTL_FTYPE;
1472
1473 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1474 local->dot11ReceivedFragmentCount++;
1475
1476 sta = rx.sta = sta_info_get(local, hdr->addr2);
1477 if (sta) {
1478 rx.dev = rx.sta->dev;
1479 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1480 }
1481
1482 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1483 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1484 goto end;
1485 }
1486
1487 if (unlikely(local->sta_scanning))
1488 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1489
1490 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1491 sta) != TXRX_CONTINUE)
1492 goto end;
1493 skb = rx.skb;
1494
1495 if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
1496 !atomic_read(&local->iff_promiscs) &&
1497 !is_multicast_ether_addr(hdr->addr1)) {
1498 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1499 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1500 rx.sta);
1501 sta_info_put(sta);
1502 rcu_read_unlock();
1503 return;
1504 }
1505
1506 bssid = ieee80211_get_bssid(hdr, skb->len);
1507
1508 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1509 if (!netif_running(sdata->dev))
1510 continue;
1511
1512 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
1513 continue;
1514
1515 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1516 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1517 /* prepare_for_handlers can change sta */
1518 sta = rx.sta;
1519
1520 if (!prepres)
1521 continue;
1522
1523 /*
1524 * frame is destined for this interface, but if it's not
1525 * also for the previous one we handle that after the
1526 * loop to avoid copying the SKB once too much
1527 */
1528
1529 if (!prev) {
1530 prev = sdata;
1531 continue;
1532 }
1533
1534 /*
1535 * frame was destined for the previous interface
1536 * so invoke RX handlers for it
1537 */
1538
1539 skb_new = skb_copy(skb, GFP_ATOMIC);
1540 if (!skb_new) {
1541 if (net_ratelimit())
1542 printk(KERN_DEBUG "%s: failed to copy "
1543 "multicast frame for %s",
1544 wiphy_name(local->hw.wiphy),
1545 prev->dev->name);
1546 continue;
1547 }
1548 rx.skb = skb_new;
1549 rx.dev = prev->dev;
1550 rx.sdata = prev;
1551 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1552 &rx, sta);
1553 prev = sdata;
1554 }
1555 if (prev) {
1556 rx.skb = skb;
1557 rx.dev = prev->dev;
1558 rx.sdata = prev;
1559 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1560 &rx, sta);
1561 } else
1562 dev_kfree_skb(skb);
1563
1564 end:
1565 rcu_read_unlock();
1566
1567 if (sta)
1568 sta_info_put(sta);
1569 }
1570 EXPORT_SYMBOL(__ieee80211_rx);
1571
1572 /* This is a version of the rx handler that can be called from hard irq
1573 * context. Post the skb on the queue and schedule the tasklet */
1574 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1575 struct ieee80211_rx_status *status)
1576 {
1577 struct ieee80211_local *local = hw_to_local(hw);
1578
1579 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1580
1581 skb->dev = local->mdev;
1582 /* copy status into skb->cb for use by tasklet */
1583 memcpy(skb->cb, status, sizeof(*status));
1584 skb->pkt_type = IEEE80211_RX_MSG;
1585 skb_queue_tail(&local->skb_queue, skb);
1586 tasklet_schedule(&local->tasklet);
1587 }
1588 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
AMDTP streaming driver for the Linux FireWire stack (Juju)