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Linux 2.6.24.5
[linux/fpc-iii.git] / net / mac80211 / rx.c
blob00f908d9275e3e69a92daf1cc4d6741015d051d5
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 #ifdef CONFIG_MAC80211_DEBUG
513 if (net_ratelimit())
514 printk(KERN_DEBUG "%s: RX protected frame,"
515 " but have no key\n", rx->dev->name);
516 #endif /* CONFIG_MAC80211_DEBUG */
517 return TXRX_DROP;
518 }
519
520 /* Check for weak IVs if possible */
521 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
522 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
523 (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
524 !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
525 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
526 rx->sta->wep_weak_iv_count++;
527
528 switch (rx->key->conf.alg) {
529 case ALG_WEP:
530 result = ieee80211_crypto_wep_decrypt(rx);
531 break;
532 case ALG_TKIP:
533 result = ieee80211_crypto_tkip_decrypt(rx);
534 break;
535 case ALG_CCMP:
536 result = ieee80211_crypto_ccmp_decrypt(rx);
537 break;
538 }
539
540 /* either the frame has been decrypted or will be dropped */
541 rx->u.rx.status->flag |= RX_FLAG_DECRYPTED;
542
543 return result;
544 }
545
546 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
547 {
548 struct ieee80211_sub_if_data *sdata;
549 DECLARE_MAC_BUF(mac);
550
551 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
552
553 if (sdata->bss)
554 atomic_inc(&sdata->bss->num_sta_ps);
555 sta->flags |= WLAN_STA_PS;
556 sta->pspoll = 0;
557 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
558 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
559 dev->name, print_mac(mac, sta->addr), sta->aid);
560 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
561 }
562
563 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
564 {
565 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
566 struct sk_buff *skb;
567 int sent = 0;
568 struct ieee80211_sub_if_data *sdata;
569 struct ieee80211_tx_packet_data *pkt_data;
570 DECLARE_MAC_BUF(mac);
571
572 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
573 if (sdata->bss)
574 atomic_dec(&sdata->bss->num_sta_ps);
575 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
576 sta->pspoll = 0;
577 if (!skb_queue_empty(&sta->ps_tx_buf)) {
578 if (local->ops->set_tim)
579 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
580 if (sdata->bss)
581 bss_tim_clear(local, sdata->bss, sta->aid);
582 }
583 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
584 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
585 dev->name, print_mac(mac, sta->addr), sta->aid);
586 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
587 /* Send all buffered frames to the station */
588 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
589 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
590 sent++;
591 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
592 dev_queue_xmit(skb);
593 }
594 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
595 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
596 local->total_ps_buffered--;
597 sent++;
598 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
599 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
600 "since STA not sleeping anymore\n", dev->name,
601 print_mac(mac, sta->addr), sta->aid);
602 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
603 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
604 dev_queue_xmit(skb);
605 }
606
607 return sent;
608 }
609
610 static ieee80211_txrx_result
611 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
612 {
613 struct sta_info *sta = rx->sta;
614 struct net_device *dev = rx->dev;
615 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
616
617 if (!sta)
618 return TXRX_CONTINUE;
619
620 /* Update last_rx only for IBSS packets which are for the current
621 * BSSID to avoid keeping the current IBSS network alive in cases where
622 * other STAs are using different BSSID. */
623 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
624 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
625 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
626 sta->last_rx = jiffies;
627 } else
628 if (!is_multicast_ether_addr(hdr->addr1) ||
629 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
630 /* Update last_rx only for unicast frames in order to prevent
631 * the Probe Request frames (the only broadcast frames from a
632 * STA in infrastructure mode) from keeping a connection alive.
633 */
634 sta->last_rx = jiffies;
635 }
636
637 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
638 return TXRX_CONTINUE;
639
640 sta->rx_fragments++;
641 sta->rx_bytes += rx->skb->len;
642 sta->last_rssi = rx->u.rx.status->ssi;
643 sta->last_signal = rx->u.rx.status->signal;
644 sta->last_noise = rx->u.rx.status->noise;
645
646 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
647 /* Change STA power saving mode only in the end of a frame
648 * exchange sequence */
649 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
650 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
651 else if (!(sta->flags & WLAN_STA_PS) &&
652 (rx->fc & IEEE80211_FCTL_PM))
653 ap_sta_ps_start(dev, sta);
654 }
655
656 /* Drop data::nullfunc frames silently, since they are used only to
657 * control station power saving mode. */
658 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
659 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
660 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
661 /* Update counter and free packet here to avoid counting this
662 * as a dropped packed. */
663 sta->rx_packets++;
664 dev_kfree_skb(rx->skb);
665 return TXRX_QUEUED;
666 }
667
668 return TXRX_CONTINUE;
669 } /* ieee80211_rx_h_sta_process */
670
671 static inline struct ieee80211_fragment_entry *
672 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
673 unsigned int frag, unsigned int seq, int rx_queue,
674 struct sk_buff **skb)
675 {
676 struct ieee80211_fragment_entry *entry;
677 int idx;
678
679 idx = sdata->fragment_next;
680 entry = &sdata->fragments[sdata->fragment_next++];
681 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
682 sdata->fragment_next = 0;
683
684 if (!skb_queue_empty(&entry->skb_list)) {
685 #ifdef CONFIG_MAC80211_DEBUG
686 struct ieee80211_hdr *hdr =
687 (struct ieee80211_hdr *) entry->skb_list.next->data;
688 DECLARE_MAC_BUF(mac);
689 DECLARE_MAC_BUF(mac2);
690 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
691 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
692 "addr1=%s addr2=%s\n",
693 sdata->dev->name, idx,
694 jiffies - entry->first_frag_time, entry->seq,
695 entry->last_frag, print_mac(mac, hdr->addr1),
696 print_mac(mac2, hdr->addr2));
697 #endif /* CONFIG_MAC80211_DEBUG */
698 __skb_queue_purge(&entry->skb_list);
699 }
700
701 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
702 *skb = NULL;
703 entry->first_frag_time = jiffies;
704 entry->seq = seq;
705 entry->rx_queue = rx_queue;
706 entry->last_frag = frag;
707 entry->ccmp = 0;
708 entry->extra_len = 0;
709
710 return entry;
711 }
712
713 static inline struct ieee80211_fragment_entry *
714 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
715 u16 fc, unsigned int frag, unsigned int seq,
716 int rx_queue, struct ieee80211_hdr *hdr)
717 {
718 struct ieee80211_fragment_entry *entry;
719 int i, idx;
720
721 idx = sdata->fragment_next;
722 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
723 struct ieee80211_hdr *f_hdr;
724 u16 f_fc;
725
726 idx--;
727 if (idx < 0)
728 idx = IEEE80211_FRAGMENT_MAX - 1;
729
730 entry = &sdata->fragments[idx];
731 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
732 entry->rx_queue != rx_queue ||
733 entry->last_frag + 1 != frag)
734 continue;
735
736 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
737 f_fc = le16_to_cpu(f_hdr->frame_control);
738
739 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
740 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
741 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
742 continue;
743
744 if (entry->first_frag_time + 2 * HZ < jiffies) {
745 __skb_queue_purge(&entry->skb_list);
746 continue;
747 }
748 return entry;
749 }
750
751 return NULL;
752 }
753
754 static ieee80211_txrx_result
755 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
756 {
757 struct ieee80211_hdr *hdr;
758 u16 sc;
759 unsigned int frag, seq;
760 struct ieee80211_fragment_entry *entry;
761 struct sk_buff *skb;
762 DECLARE_MAC_BUF(mac);
763
764 hdr = (struct ieee80211_hdr *) rx->skb->data;
765 sc = le16_to_cpu(hdr->seq_ctrl);
766 frag = sc & IEEE80211_SCTL_FRAG;
767
768 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
769 (rx->skb)->len < 24 ||
770 is_multicast_ether_addr(hdr->addr1))) {
771 /* not fragmented */
772 goto out;
773 }
774 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
775
776 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
777
778 if (frag == 0) {
779 /* This is the first fragment of a new frame. */
780 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
781 rx->u.rx.queue, &(rx->skb));
782 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
783 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
784 /* Store CCMP PN so that we can verify that the next
785 * fragment has a sequential PN value. */
786 entry->ccmp = 1;
787 memcpy(entry->last_pn,
788 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
789 CCMP_PN_LEN);
790 }
791 return TXRX_QUEUED;
792 }
793
794 /* This is a fragment for a frame that should already be pending in
795 * fragment cache. Add this fragment to the end of the pending entry.
796 */
797 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
798 rx->u.rx.queue, hdr);
799 if (!entry) {
800 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
801 return TXRX_DROP;
802 }
803
804 /* Verify that MPDUs within one MSDU have sequential PN values.
805 * (IEEE 802.11i, 8.3.3.4.5) */
806 if (entry->ccmp) {
807 int i;
808 u8 pn[CCMP_PN_LEN], *rpn;
809 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
810 return TXRX_DROP;
811 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
812 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
813 pn[i]++;
814 if (pn[i])
815 break;
816 }
817 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
818 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
819 if (net_ratelimit())
820 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
821 "sequential A2=%s"
822 " PN=%02x%02x%02x%02x%02x%02x "
823 "(expected %02x%02x%02x%02x%02x%02x)\n",
824 rx->dev->name, print_mac(mac, hdr->addr2),
825 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
826 rpn[5], pn[0], pn[1], pn[2], pn[3],
827 pn[4], pn[5]);
828 return TXRX_DROP;
829 }
830 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
831 }
832
833 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
834 __skb_queue_tail(&entry->skb_list, rx->skb);
835 entry->last_frag = frag;
836 entry->extra_len += rx->skb->len;
837 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
838 rx->skb = NULL;
839 return TXRX_QUEUED;
840 }
841
842 rx->skb = __skb_dequeue(&entry->skb_list);
843 if (skb_tailroom(rx->skb) < entry->extra_len) {
844 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
845 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
846 GFP_ATOMIC))) {
847 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
848 __skb_queue_purge(&entry->skb_list);
849 return TXRX_DROP;
850 }
851 }
852 while ((skb = __skb_dequeue(&entry->skb_list))) {
853 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
854 dev_kfree_skb(skb);
855 }
856
857 /* Complete frame has been reassembled - process it now */
858 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
859
860 out:
861 if (rx->sta)
862 rx->sta->rx_packets++;
863 if (is_multicast_ether_addr(hdr->addr1))
864 rx->local->dot11MulticastReceivedFrameCount++;
865 else
866 ieee80211_led_rx(rx->local);
867 return TXRX_CONTINUE;
868 }
869
870 static ieee80211_txrx_result
871 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
872 {
873 struct sk_buff *skb;
874 int no_pending_pkts;
875 DECLARE_MAC_BUF(mac);
876
877 if (likely(!rx->sta ||
878 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
879 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
880 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
881 return TXRX_CONTINUE;
882
883 skb = skb_dequeue(&rx->sta->tx_filtered);
884 if (!skb) {
885 skb = skb_dequeue(&rx->sta->ps_tx_buf);
886 if (skb)
887 rx->local->total_ps_buffered--;
888 }
889 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
890 skb_queue_empty(&rx->sta->ps_tx_buf);
891
892 if (skb) {
893 struct ieee80211_hdr *hdr =
894 (struct ieee80211_hdr *) skb->data;
895
896 /* tell TX path to send one frame even though the STA may
897 * still remain is PS mode after this frame exchange */
898 rx->sta->pspoll = 1;
899
900 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
901 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
902 print_mac(mac, rx->sta->addr), rx->sta->aid,
903 skb_queue_len(&rx->sta->ps_tx_buf));
904 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
905
906 /* Use MoreData flag to indicate whether there are more
907 * buffered frames for this STA */
908 if (no_pending_pkts) {
909 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
910 rx->sta->flags &= ~WLAN_STA_TIM;
911 } else
912 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
913
914 dev_queue_xmit(skb);
915
916 if (no_pending_pkts) {
917 if (rx->local->ops->set_tim)
918 rx->local->ops->set_tim(local_to_hw(rx->local),
919 rx->sta->aid, 0);
920 if (rx->sdata->bss)
921 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
922 }
923 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
924 } else if (!rx->u.rx.sent_ps_buffered) {
925 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
926 "though there is no buffered frames for it\n",
927 rx->dev->name, print_mac(mac, rx->sta->addr));
928 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
929
930 }
931
932 /* Free PS Poll skb here instead of returning TXRX_DROP that would
933 * count as an dropped frame. */
934 dev_kfree_skb(rx->skb);
935
936 return TXRX_QUEUED;
937 }
938
939 static ieee80211_txrx_result
940 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
941 {
942 u16 fc = rx->fc;
943 u8 *data = rx->skb->data;
944 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
945
946 if (!WLAN_FC_IS_QOS_DATA(fc))
947 return TXRX_CONTINUE;
948
949 /* remove the qos control field, update frame type and meta-data */
950 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
951 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
952 /* change frame type to non QOS */
953 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
954 hdr->frame_control = cpu_to_le16(fc);
955
956 return TXRX_CONTINUE;
957 }
958
959 static ieee80211_txrx_result
960 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
961 {
962 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
963 rx->sdata->type != IEEE80211_IF_TYPE_STA &&
964 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
965 return TXRX_CONTINUE;
966
967 if (unlikely(rx->sdata->ieee802_1x &&
968 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
969 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
970 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
971 !ieee80211_is_eapol(rx->skb))) {
972 #ifdef CONFIG_MAC80211_DEBUG
973 struct ieee80211_hdr *hdr =
974 (struct ieee80211_hdr *) rx->skb->data;
975 DECLARE_MAC_BUF(mac);
976 printk(KERN_DEBUG "%s: dropped frame from %s"
977 " (unauthorized port)\n", rx->dev->name,
978 print_mac(mac, hdr->addr2));
979 #endif /* CONFIG_MAC80211_DEBUG */
980 return TXRX_DROP;
981 }
982
983 return TXRX_CONTINUE;
984 }
985
986 static ieee80211_txrx_result
987 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
988 {
989 /*
990 * Pass through unencrypted frames if the hardware has
991 * decrypted them already.
992 */
993 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
994 return TXRX_CONTINUE;
995
996 /* Drop unencrypted frames if key is set. */
997 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
998 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
999 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1000 (rx->key || rx->sdata->drop_unencrypted) &&
1001 (rx->sdata->eapol == 0 || !ieee80211_is_eapol(rx->skb)))) {
1002 if (net_ratelimit())
1003 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
1004 "encryption\n", rx->dev->name);
1005 return TXRX_DROP;
1006 }
1007 return TXRX_CONTINUE;
1008 }
1009
1010 static ieee80211_txrx_result
1011 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
1012 {
1013 struct net_device *dev = rx->dev;
1014 struct ieee80211_local *local = rx->local;
1015 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1016 u16 fc, hdrlen, ethertype;
1017 u8 *payload;
1018 u8 dst[ETH_ALEN];
1019 u8 src[ETH_ALEN];
1020 struct sk_buff *skb = rx->skb, *skb2;
1021 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1022 DECLARE_MAC_BUF(mac);
1023 DECLARE_MAC_BUF(mac2);
1024 DECLARE_MAC_BUF(mac3);
1025 DECLARE_MAC_BUF(mac4);
1026
1027 fc = rx->fc;
1028 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1029 return TXRX_CONTINUE;
1030
1031 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1032 return TXRX_DROP;
1033
1034 hdrlen = ieee80211_get_hdrlen(fc);
1035
1036 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1037 * header
1038 * IEEE 802.11 address fields:
1039 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1040 * 0 0 DA SA BSSID n/a
1041 * 0 1 DA BSSID SA n/a
1042 * 1 0 BSSID SA DA n/a
1043 * 1 1 RA TA DA SA
1044 */
1045
1046 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1047 case IEEE80211_FCTL_TODS:
1048 /* BSSID SA DA */
1049 memcpy(dst, hdr->addr3, ETH_ALEN);
1050 memcpy(src, hdr->addr2, ETH_ALEN);
1051
1052 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
1053 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
1054 if (net_ratelimit())
1055 printk(KERN_DEBUG "%s: dropped ToDS frame "
1056 "(BSSID=%s SA=%s DA=%s)\n",
1057 dev->name,
1058 print_mac(mac, hdr->addr1),
1059 print_mac(mac2, hdr->addr2),
1060 print_mac(mac3, hdr->addr3));
1061 return TXRX_DROP;
1062 }
1063 break;
1064 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1065 /* RA TA DA SA */
1066 memcpy(dst, hdr->addr3, ETH_ALEN);
1067 memcpy(src, hdr->addr4, ETH_ALEN);
1068
1069 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
1070 if (net_ratelimit())
1071 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
1072 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1073 rx->dev->name,
1074 print_mac(mac, hdr->addr1),
1075 print_mac(mac2, hdr->addr2),
1076 print_mac(mac3, hdr->addr3),
1077 print_mac(mac4, hdr->addr4));
1078 return TXRX_DROP;
1079 }
1080 break;
1081 case IEEE80211_FCTL_FROMDS:
1082 /* DA BSSID SA */
1083 memcpy(dst, hdr->addr1, ETH_ALEN);
1084 memcpy(src, hdr->addr3, ETH_ALEN);
1085
1086 if (sdata->type != IEEE80211_IF_TYPE_STA ||
1087 (is_multicast_ether_addr(dst) &&
1088 !compare_ether_addr(src, dev->dev_addr)))
1089 return TXRX_DROP;
1090 break;
1091 case 0:
1092 /* DA SA BSSID */
1093 memcpy(dst, hdr->addr1, ETH_ALEN);
1094 memcpy(src, hdr->addr2, ETH_ALEN);
1095
1096 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1097 if (net_ratelimit()) {
1098 printk(KERN_DEBUG "%s: dropped IBSS frame "
1099 "(DA=%s SA=%s BSSID=%s)\n",
1100 dev->name,
1101 print_mac(mac, hdr->addr1),
1102 print_mac(mac2, hdr->addr2),
1103 print_mac(mac3, hdr->addr3));
1104 }
1105 return TXRX_DROP;
1106 }
1107 break;
1108 }
1109
1110 payload = skb->data + hdrlen;
1111
1112 if (unlikely(skb->len - hdrlen < 8)) {
1113 if (net_ratelimit()) {
1114 printk(KERN_DEBUG "%s: RX too short data frame "
1115 "payload\n", dev->name);
1116 }
1117 return TXRX_DROP;
1118 }
1119
1120 ethertype = (payload[6] << 8) | payload[7];
1121
1122 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1123 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1124 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1125 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1126 * replace EtherType */
1127 skb_pull(skb, hdrlen + 6);
1128 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1129 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1130 } else {
1131 struct ethhdr *ehdr;
1132 __be16 len;
1133 skb_pull(skb, hdrlen);
1134 len = htons(skb->len);
1135 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1136 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1137 memcpy(ehdr->h_source, src, ETH_ALEN);
1138 ehdr->h_proto = len;
1139 }
1140 skb->dev = dev;
1141
1142 skb2 = NULL;
1143
1144 dev->stats.rx_packets++;
1145 dev->stats.rx_bytes += skb->len;
1146
1147 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1148 || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1149 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
1150 if (is_multicast_ether_addr(skb->data)) {
1151 /* send multicast frames both to higher layers in
1152 * local net stack and back to the wireless media */
1153 skb2 = skb_copy(skb, GFP_ATOMIC);
1154 if (!skb2 && net_ratelimit())
1155 printk(KERN_DEBUG "%s: failed to clone "
1156 "multicast frame\n", dev->name);
1157 } else {
1158 struct sta_info *dsta;
1159 dsta = sta_info_get(local, skb->data);
1160 if (dsta && !dsta->dev) {
1161 if (net_ratelimit())
1162 printk(KERN_DEBUG "Station with null "
1163 "dev structure!\n");
1164 } else if (dsta && dsta->dev == dev) {
1165 /* Destination station is associated to this
1166 * AP, so send the frame directly to it and
1167 * do not pass the frame to local net stack.
1168 */
1169 skb2 = skb;
1170 skb = NULL;
1171 }
1172 if (dsta)
1173 sta_info_put(dsta);
1174 }
1175 }
1176
1177 if (skb) {
1178 /* deliver to local stack */
1179 skb->protocol = eth_type_trans(skb, dev);
1180 memset(skb->cb, 0, sizeof(skb->cb));
1181 netif_rx(skb);
1182 }
1183
1184 if (skb2) {
1185 /* send to wireless media */
1186 skb2->protocol = __constant_htons(ETH_P_802_3);
1187 skb_set_network_header(skb2, 0);
1188 skb_set_mac_header(skb2, 0);
1189 dev_queue_xmit(skb2);
1190 }
1191
1192 return TXRX_QUEUED;
1193 }
1194
1195 static ieee80211_txrx_result
1196 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1197 {
1198 struct ieee80211_sub_if_data *sdata;
1199
1200 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
1201 return TXRX_DROP;
1202
1203 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1204 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1205 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1206 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1207 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1208 else
1209 return TXRX_DROP;
1210
1211 return TXRX_QUEUED;
1212 }
1213
1214 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1215 struct ieee80211_local *local,
1216 ieee80211_rx_handler *handlers,
1217 struct ieee80211_txrx_data *rx,
1218 struct sta_info *sta)
1219 {
1220 ieee80211_rx_handler *handler;
1221 ieee80211_txrx_result res = TXRX_DROP;
1222
1223 for (handler = handlers; *handler != NULL; handler++) {
1224 res = (*handler)(rx);
1225
1226 switch (res) {
1227 case TXRX_CONTINUE:
1228 continue;
1229 case TXRX_DROP:
1230 I802_DEBUG_INC(local->rx_handlers_drop);
1231 if (sta)
1232 sta->rx_dropped++;
1233 break;
1234 case TXRX_QUEUED:
1235 I802_DEBUG_INC(local->rx_handlers_queued);
1236 break;
1237 }
1238 break;
1239 }
1240
1241 if (res == TXRX_DROP)
1242 dev_kfree_skb(rx->skb);
1243 return res;
1244 }
1245
1246 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1247 ieee80211_rx_handler *handlers,
1248 struct ieee80211_txrx_data *rx,
1249 struct sta_info *sta)
1250 {
1251 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1252 TXRX_CONTINUE)
1253 dev_kfree_skb(rx->skb);
1254 }
1255
1256 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1257 struct ieee80211_hdr *hdr,
1258 struct sta_info *sta,
1259 struct ieee80211_txrx_data *rx)
1260 {
1261 int keyidx, hdrlen;
1262 DECLARE_MAC_BUF(mac);
1263 DECLARE_MAC_BUF(mac2);
1264
1265 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1266 if (rx->skb->len >= hdrlen + 4)
1267 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1268 else
1269 keyidx = -1;
1270
1271 if (net_ratelimit())
1272 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1273 "failure from %s to %s keyidx=%d\n",
1274 dev->name, print_mac(mac, hdr->addr2),
1275 print_mac(mac2, hdr->addr1), keyidx);
1276
1277 if (!sta) {
1278 /*
1279 * Some hardware seem to generate incorrect Michael MIC
1280 * reports; ignore them to avoid triggering countermeasures.
1281 */
1282 if (net_ratelimit())
1283 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1284 "error for unknown address %s\n",
1285 dev->name, print_mac(mac, hdr->addr2));
1286 goto ignore;
1287 }
1288
1289 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1290 if (net_ratelimit())
1291 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1292 "error for a frame with no PROTECTED flag (src "
1293 "%s)\n", dev->name, print_mac(mac, hdr->addr2));
1294 goto ignore;
1295 }
1296
1297 if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
1298 /*
1299 * APs with pairwise keys should never receive Michael MIC
1300 * errors for non-zero keyidx because these are reserved for
1301 * group keys and only the AP is sending real multicast
1302 * frames in the BSS.
1303 */
1304 if (net_ratelimit())
1305 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1306 "a frame with non-zero keyidx (%d)"
1307 " (src %s)\n", dev->name, keyidx,
1308 print_mac(mac, hdr->addr2));
1309 goto ignore;
1310 }
1311
1312 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1313 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1314 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1315 if (net_ratelimit())
1316 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1317 "error for a frame that cannot be encrypted "
1318 "(fc=0x%04x) (src %s)\n",
1319 dev->name, rx->fc, print_mac(mac, hdr->addr2));
1320 goto ignore;
1321 }
1322
1323 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1324 ignore:
1325 dev_kfree_skb(rx->skb);
1326 rx->skb = NULL;
1327 }
1328
1329 ieee80211_rx_handler ieee80211_rx_handlers[] =
1330 {
1331 ieee80211_rx_h_if_stats,
1332 ieee80211_rx_h_passive_scan,
1333 ieee80211_rx_h_check,
1334 ieee80211_rx_h_decrypt,
1335 ieee80211_rx_h_sta_process,
1336 ieee80211_rx_h_defragment,
1337 ieee80211_rx_h_ps_poll,
1338 ieee80211_rx_h_michael_mic_verify,
1339 /* this must be after decryption - so header is counted in MPDU mic
1340 * must be before pae and data, so QOS_DATA format frames
1341 * are not passed to user space by these functions
1342 */
1343 ieee80211_rx_h_remove_qos_control,
1344 ieee80211_rx_h_802_1x_pae,
1345 ieee80211_rx_h_drop_unencrypted,
1346 ieee80211_rx_h_data,
1347 ieee80211_rx_h_mgmt,
1348 NULL
1349 };
1350
1351 /* main receive path */
1352
1353 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1354 u8 *bssid, struct ieee80211_txrx_data *rx,
1355 struct ieee80211_hdr *hdr)
1356 {
1357 int multicast = is_multicast_ether_addr(hdr->addr1);
1358
1359 switch (sdata->type) {
1360 case IEEE80211_IF_TYPE_STA:
1361 if (!bssid)
1362 return 0;
1363 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1364 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1365 return 0;
1366 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1367 } else if (!multicast &&
1368 compare_ether_addr(sdata->dev->dev_addr,
1369 hdr->addr1) != 0) {
1370 if (!(sdata->dev->flags & IFF_PROMISC))
1371 return 0;
1372 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1373 }
1374 break;
1375 case IEEE80211_IF_TYPE_IBSS:
1376 if (!bssid)
1377 return 0;
1378 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1379 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1380 return 0;
1381 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1382 } else if (!multicast &&
1383 compare_ether_addr(sdata->dev->dev_addr,
1384 hdr->addr1) != 0) {
1385 if (!(sdata->dev->flags & IFF_PROMISC))
1386 return 0;
1387 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1388 } else if (!rx->sta)
1389 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1390 bssid, hdr->addr2);
1391 break;
1392 case IEEE80211_IF_TYPE_VLAN:
1393 case IEEE80211_IF_TYPE_AP:
1394 if (!bssid) {
1395 if (compare_ether_addr(sdata->dev->dev_addr,
1396 hdr->addr1))
1397 return 0;
1398 } else if (!ieee80211_bssid_match(bssid,
1399 sdata->dev->dev_addr)) {
1400 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1401 return 0;
1402 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1403 }
1404 if (sdata->dev == sdata->local->mdev &&
1405 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1406 /* do not receive anything via
1407 * master device when not scanning */
1408 return 0;
1409 break;
1410 case IEEE80211_IF_TYPE_WDS:
1411 if (bssid ||
1412 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1413 return 0;
1414 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1415 return 0;
1416 break;
1417 case IEEE80211_IF_TYPE_MNTR:
1418 /* take everything */
1419 break;
1420 case IEEE80211_IF_TYPE_INVALID:
1421 /* should never get here */
1422 WARN_ON(1);
1423 break;
1424 }
1425
1426 return 1;
1427 }
1428
1429 /*
1430 * This is the receive path handler. It is called by a low level driver when an
1431 * 802.11 MPDU is received from the hardware.
1432 */
1433 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1434 struct ieee80211_rx_status *status)
1435 {
1436 struct ieee80211_local *local = hw_to_local(hw);
1437 struct ieee80211_sub_if_data *sdata;
1438 struct sta_info *sta;
1439 struct ieee80211_hdr *hdr;
1440 struct ieee80211_txrx_data rx;
1441 u16 type;
1442 int prepres;
1443 struct ieee80211_sub_if_data *prev = NULL;
1444 struct sk_buff *skb_new;
1445 u8 *bssid;
1446
1447 /*
1448 * key references and virtual interfaces are protected using RCU
1449 * and this requires that we are in a read-side RCU section during
1450 * receive processing
1451 */
1452 rcu_read_lock();
1453
1454 /*
1455 * Frames with failed FCS/PLCP checksum are not returned,
1456 * all other frames are returned without radiotap header
1457 * if it was previously present.
1458 * Also, frames with less than 16 bytes are dropped.
1459 */
1460 skb = ieee80211_rx_monitor(local, skb, status);
1461 if (!skb) {
1462 rcu_read_unlock();
1463 return;
1464 }
1465
1466 hdr = (struct ieee80211_hdr *) skb->data;
1467 memset(&rx, 0, sizeof(rx));
1468 rx.skb = skb;
1469 rx.local = local;
1470
1471 rx.u.rx.status = status;
1472 rx.fc = le16_to_cpu(hdr->frame_control);
1473 type = rx.fc & IEEE80211_FCTL_FTYPE;
1474
1475 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1476 local->dot11ReceivedFragmentCount++;
1477
1478 sta = rx.sta = sta_info_get(local, hdr->addr2);
1479 if (sta) {
1480 rx.dev = rx.sta->dev;
1481 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1482 }
1483
1484 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1485 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1486 goto end;
1487 }
1488
1489 if (unlikely(local->sta_scanning))
1490 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1491
1492 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1493 sta) != TXRX_CONTINUE)
1494 goto end;
1495 skb = rx.skb;
1496
1497 if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
1498 !atomic_read(&local->iff_promiscs) &&
1499 !is_multicast_ether_addr(hdr->addr1)) {
1500 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1501 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1502 rx.sta);
1503 sta_info_put(sta);
1504 rcu_read_unlock();
1505 return;
1506 }
1507
1508 bssid = ieee80211_get_bssid(hdr, skb->len);
1509
1510 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1511 if (!netif_running(sdata->dev))
1512 continue;
1513
1514 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
1515 continue;
1516
1517 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1518 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1519 /* prepare_for_handlers can change sta */
1520 sta = rx.sta;
1521
1522 if (!prepres)
1523 continue;
1524
1525 /*
1526 * frame is destined for this interface, but if it's not
1527 * also for the previous one we handle that after the
1528 * loop to avoid copying the SKB once too much
1529 */
1530
1531 if (!prev) {
1532 prev = sdata;
1533 continue;
1534 }
1535
1536 /*
1537 * frame was destined for the previous interface
1538 * so invoke RX handlers for it
1539 */
1540
1541 skb_new = skb_copy(skb, GFP_ATOMIC);
1542 if (!skb_new) {
1543 if (net_ratelimit())
1544 printk(KERN_DEBUG "%s: failed to copy "
1545 "multicast frame for %s",
1546 wiphy_name(local->hw.wiphy),
1547 prev->dev->name);
1548 continue;
1549 }
1550 rx.skb = skb_new;
1551 rx.dev = prev->dev;
1552 rx.sdata = prev;
1553 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1554 &rx, sta);
1555 prev = sdata;
1556 }
1557 if (prev) {
1558 rx.skb = skb;
1559 rx.dev = prev->dev;
1560 rx.sdata = prev;
1561 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1562 &rx, sta);
1563 } else
1564 dev_kfree_skb(skb);
1565
1566 end:
1567 rcu_read_unlock();
1568
1569 if (sta)
1570 sta_info_put(sta);
1571 }
1572 EXPORT_SYMBOL(__ieee80211_rx);
1573
1574 /* This is a version of the rx handler that can be called from hard irq
1575 * context. Post the skb on the queue and schedule the tasklet */
1576 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1577 struct ieee80211_rx_status *status)
1578 {
1579 struct ieee80211_local *local = hw_to_local(hw);
1580
1581 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1582
1583 skb->dev = local->mdev;
1584 /* copy status into skb->cb for use by tasklet */
1585 memcpy(skb->cb, status, sizeof(*status));
1586 skb->pkt_type = IEEE80211_RX_MSG;
1587 skb_queue_tail(&local->skb_queue, skb);
1588 tasklet_schedule(&local->tasklet);
1589 }
1590 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux with added FPC-III support