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[MAC80211]: ratelimit some RX messages
[linux-2.6/verdex.git] / net / mac80211 / rx.c
blob7a6e60fcf9d026fa3555bc9b7dc5a55d4f8a4a1d
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 <net/iw_handler.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 "ieee80211_common.h"
23 #include "wep.h"
24 #include "wpa.h"
25 #include "tkip.h"
26 #include "wme.h"
27
28 /* pre-rx handlers
29 *
30 * these don't have dev/sdata fields in the rx data
31 * The sta value should also not be used because it may
32 * be NULL even though a STA (in IBSS mode) will be added.
33 */
34
35 static ieee80211_txrx_result
36 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
37 {
38 u8 *data = rx->skb->data;
39 int tid;
40
41 /* does the frame have a qos control field? */
42 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
43 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
44 /* frame has qos control */
45 tid = qc[0] & QOS_CONTROL_TID_MASK;
46 } else {
47 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
48 /* Separate TID for management frames */
49 tid = NUM_RX_DATA_QUEUES - 1;
50 } else {
51 /* no qos control present */
52 tid = 0; /* 802.1d - Best Effort */
53 }
54 }
55
56 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
57 /* only a debug counter, sta might not be assigned properly yet */
58 if (rx->sta)
59 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
60
61 rx->u.rx.queue = tid;
62 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
63 * For now, set skb->priority to 0 for other cases. */
64 rx->skb->priority = (tid > 7) ? 0 : tid;
65
66 return TXRX_CONTINUE;
67 }
68
69 static ieee80211_txrx_result
70 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
71 {
72 struct ieee80211_local *local = rx->local;
73 struct sk_buff *skb = rx->skb;
74 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
75 u32 load = 0, hdrtime;
76 struct ieee80211_rate *rate;
77 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
78 int i;
79
80 /* Estimate total channel use caused by this frame */
81
82 if (unlikely(mode->num_rates < 0))
83 return TXRX_CONTINUE;
84
85 rate = &mode->rates[0];
86 for (i = 0; i < mode->num_rates; i++) {
87 if (mode->rates[i].val == rx->u.rx.status->rate) {
88 rate = &mode->rates[i];
89 break;
90 }
91 }
92
93 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
94 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
95
96 if (mode->mode == MODE_IEEE80211A ||
97 mode->mode == MODE_ATHEROS_TURBO ||
98 mode->mode == MODE_ATHEROS_TURBOG ||
99 (mode->mode == MODE_IEEE80211G &&
100 rate->flags & IEEE80211_RATE_ERP))
101 hdrtime = CHAN_UTIL_HDR_SHORT;
102 else
103 hdrtime = CHAN_UTIL_HDR_LONG;
104
105 load = hdrtime;
106 if (!is_multicast_ether_addr(hdr->addr1))
107 load += hdrtime;
108
109 load += skb->len * rate->rate_inv;
110
111 /* Divide channel_use by 8 to avoid wrapping around the counter */
112 load >>= CHAN_UTIL_SHIFT;
113 local->channel_use_raw += load;
114 rx->u.rx.load = load;
115
116 return TXRX_CONTINUE;
117 }
118
119 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
120 {
121 ieee80211_rx_h_parse_qos,
122 ieee80211_rx_h_load_stats,
123 NULL
124 };
125
126 /* rx handlers */
127
128 static ieee80211_txrx_result
129 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
130 {
131 if (rx->sta)
132 rx->sta->channel_use_raw += rx->u.rx.load;
133 rx->sdata->channel_use_raw += rx->u.rx.load;
134 return TXRX_CONTINUE;
135 }
136
137 static void
138 ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
139 struct ieee80211_rx_status *status)
140 {
141 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
142 struct ieee80211_sub_if_data *sdata;
143 struct ieee80211_rate *rate;
144 struct ieee80211_rtap_hdr {
145 struct ieee80211_radiotap_header hdr;
146 u8 flags;
147 u8 rate;
148 __le16 chan_freq;
149 __le16 chan_flags;
150 u8 antsignal;
151 } __attribute__ ((packed)) *rthdr;
152
153 skb->dev = dev;
154
155 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
156
157 if (status->flag & RX_FLAG_RADIOTAP)
158 goto out;
159
160 if (skb_headroom(skb) < sizeof(*rthdr)) {
161 I802_DEBUG_INC(local->rx_expand_skb_head);
162 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
163 dev_kfree_skb(skb);
164 return;
165 }
166 }
167
168 rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
169 memset(rthdr, 0, sizeof(*rthdr));
170 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
171 rthdr->hdr.it_present =
172 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
173 (1 << IEEE80211_RADIOTAP_RATE) |
174 (1 << IEEE80211_RADIOTAP_CHANNEL) |
175 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
176 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
177 IEEE80211_RADIOTAP_F_FCS : 0;
178 rate = ieee80211_get_rate(local, status->phymode, status->rate);
179 if (rate)
180 rthdr->rate = rate->rate / 5;
181 rthdr->chan_freq = cpu_to_le16(status->freq);
182 rthdr->chan_flags =
183 status->phymode == MODE_IEEE80211A ?
184 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
185 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
186 rthdr->antsignal = status->ssi;
187
188 out:
189 sdata->stats.rx_packets++;
190 sdata->stats.rx_bytes += skb->len;
191
192 skb_set_mac_header(skb, 0);
193 skb->ip_summed = CHECKSUM_UNNECESSARY;
194 skb->pkt_type = PACKET_OTHERHOST;
195 skb->protocol = htons(ETH_P_802_2);
196 memset(skb->cb, 0, sizeof(skb->cb));
197 netif_rx(skb);
198 }
199
200 static ieee80211_txrx_result
201 ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
202 {
203 if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
204 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
205 return TXRX_QUEUED;
206 }
207
208 if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
209 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data));
210
211 return TXRX_CONTINUE;
212 }
213
214 static ieee80211_txrx_result
215 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
216 {
217 struct ieee80211_local *local = rx->local;
218 struct sk_buff *skb = rx->skb;
219
220 if (unlikely(local->sta_scanning != 0)) {
221 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
222 return TXRX_QUEUED;
223 }
224
225 if (unlikely(rx->u.rx.in_scan)) {
226 /* scanning finished during invoking of handlers */
227 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
228 return TXRX_DROP;
229 }
230
231 return TXRX_CONTINUE;
232 }
233
234 static ieee80211_txrx_result
235 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
236 {
237 struct ieee80211_hdr *hdr;
238 hdr = (struct ieee80211_hdr *) rx->skb->data;
239
240 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
241 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
242 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
243 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
244 hdr->seq_ctrl)) {
245 if (rx->u.rx.ra_match) {
246 rx->local->dot11FrameDuplicateCount++;
247 rx->sta->num_duplicates++;
248 }
249 return TXRX_DROP;
250 } else
251 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
252 }
253
254 if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
255 rx->skb->len > FCS_LEN)
256 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
257
258 if (unlikely(rx->skb->len < 16)) {
259 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
260 return TXRX_DROP;
261 }
262
263 if (!rx->u.rx.ra_match)
264 rx->skb->pkt_type = PACKET_OTHERHOST;
265 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
266 rx->skb->pkt_type = PACKET_HOST;
267 else if (is_multicast_ether_addr(hdr->addr1)) {
268 if (is_broadcast_ether_addr(hdr->addr1))
269 rx->skb->pkt_type = PACKET_BROADCAST;
270 else
271 rx->skb->pkt_type = PACKET_MULTICAST;
272 } else
273 rx->skb->pkt_type = PACKET_OTHERHOST;
274
275 /* Drop disallowed frame classes based on STA auth/assoc state;
276 * IEEE 802.11, Chap 5.5.
277 *
278 * 80211.o does filtering only based on association state, i.e., it
279 * drops Class 3 frames from not associated stations. hostapd sends
280 * deauth/disassoc frames when needed. In addition, hostapd is
281 * responsible for filtering on both auth and assoc states.
282 */
283 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
284 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
285 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
286 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
287 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
288 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
289 !(rx->fc & IEEE80211_FCTL_TODS) &&
290 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
291 || !rx->u.rx.ra_match) {
292 /* Drop IBSS frames and frames for other hosts
293 * silently. */
294 return TXRX_DROP;
295 }
296
297 if (!rx->local->apdev)
298 return TXRX_DROP;
299
300 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
301 ieee80211_msg_sta_not_assoc);
302 return TXRX_QUEUED;
303 }
304
305 return TXRX_CONTINUE;
306 }
307
308
309 static ieee80211_txrx_result
310 ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
311 {
312 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
313 int always_sta_key;
314
315 if (rx->sdata->type == IEEE80211_IF_TYPE_STA)
316 always_sta_key = 0;
317 else
318 always_sta_key = 1;
319
320 if (rx->sta && rx->sta->key && always_sta_key) {
321 rx->key = rx->sta->key;
322 } else {
323 if (rx->sta && rx->sta->key)
324 rx->key = rx->sta->key;
325 else
326 rx->key = rx->sdata->default_key;
327
328 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
329 rx->fc & IEEE80211_FCTL_PROTECTED) {
330 int keyidx = ieee80211_wep_get_keyidx(rx->skb);
331
332 if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS &&
333 (!rx->sta || !rx->sta->key || keyidx > 0))
334 rx->key = rx->sdata->keys[keyidx];
335
336 if (!rx->key) {
337 if (!rx->u.rx.ra_match)
338 return TXRX_DROP;
339 if (net_ratelimit())
340 printk(KERN_DEBUG "%s: RX WEP frame "
341 "with unknown keyidx %d "
342 "(A1=" MAC_FMT
343 " A2=" MAC_FMT
344 " A3=" MAC_FMT ")\n",
345 rx->dev->name, keyidx,
346 MAC_ARG(hdr->addr1),
347 MAC_ARG(hdr->addr2),
348 MAC_ARG(hdr->addr3));
349 if (!rx->local->apdev)
350 return TXRX_DROP;
351 ieee80211_rx_mgmt(
352 rx->local, rx->skb, rx->u.rx.status,
353 ieee80211_msg_wep_frame_unknown_key);
354 return TXRX_QUEUED;
355 }
356 }
357 }
358
359 if (rx->fc & IEEE80211_FCTL_PROTECTED && rx->key && rx->u.rx.ra_match) {
360 rx->key->tx_rx_count++;
361 if (unlikely(rx->local->key_tx_rx_threshold &&
362 rx->key->tx_rx_count >
363 rx->local->key_tx_rx_threshold)) {
364 ieee80211_key_threshold_notify(rx->dev, rx->key,
365 rx->sta);
366 }
367 }
368
369 return TXRX_CONTINUE;
370 }
371
372 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
373 {
374 struct ieee80211_sub_if_data *sdata;
375 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
376
377 if (sdata->bss)
378 atomic_inc(&sdata->bss->num_sta_ps);
379 sta->flags |= WLAN_STA_PS;
380 sta->pspoll = 0;
381 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
382 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
383 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
384 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
385 }
386
387 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
388 {
389 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
390 struct sk_buff *skb;
391 int sent = 0;
392 struct ieee80211_sub_if_data *sdata;
393 struct ieee80211_tx_packet_data *pkt_data;
394
395 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
396 if (sdata->bss)
397 atomic_dec(&sdata->bss->num_sta_ps);
398 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
399 sta->pspoll = 0;
400 if (!skb_queue_empty(&sta->ps_tx_buf)) {
401 if (local->ops->set_tim)
402 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
403 if (sdata->bss)
404 bss_tim_clear(local, sdata->bss, sta->aid);
405 }
406 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
407 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
408 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
409 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
410 /* Send all buffered frames to the station */
411 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
412 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
413 sent++;
414 pkt_data->requeue = 1;
415 dev_queue_xmit(skb);
416 }
417 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
418 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
419 local->total_ps_buffered--;
420 sent++;
421 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
422 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
423 "since STA not sleeping anymore\n", dev->name,
424 MAC_ARG(sta->addr), sta->aid);
425 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
426 pkt_data->requeue = 1;
427 dev_queue_xmit(skb);
428 }
429
430 return sent;
431 }
432
433 static ieee80211_txrx_result
434 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
435 {
436 struct sta_info *sta = rx->sta;
437 struct net_device *dev = rx->dev;
438 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
439
440 if (!sta)
441 return TXRX_CONTINUE;
442
443 /* Update last_rx only for IBSS packets which are for the current
444 * BSSID to avoid keeping the current IBSS network alive in cases where
445 * other STAs are using different BSSID. */
446 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
447 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
448 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
449 sta->last_rx = jiffies;
450 } else
451 if (!is_multicast_ether_addr(hdr->addr1) ||
452 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
453 /* Update last_rx only for unicast frames in order to prevent
454 * the Probe Request frames (the only broadcast frames from a
455 * STA in infrastructure mode) from keeping a connection alive.
456 */
457 sta->last_rx = jiffies;
458 }
459
460 if (!rx->u.rx.ra_match)
461 return TXRX_CONTINUE;
462
463 sta->rx_fragments++;
464 sta->rx_bytes += rx->skb->len;
465 sta->last_rssi = (sta->last_rssi * 15 +
466 rx->u.rx.status->ssi) / 16;
467 sta->last_signal = (sta->last_signal * 15 +
468 rx->u.rx.status->signal) / 16;
469 sta->last_noise = (sta->last_noise * 15 +
470 rx->u.rx.status->noise) / 16;
471
472 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
473 /* Change STA power saving mode only in the end of a frame
474 * exchange sequence */
475 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
476 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
477 else if (!(sta->flags & WLAN_STA_PS) &&
478 (rx->fc & IEEE80211_FCTL_PM))
479 ap_sta_ps_start(dev, sta);
480 }
481
482 /* Drop data::nullfunc frames silently, since they are used only to
483 * control station power saving mode. */
484 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
485 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
486 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
487 /* Update counter and free packet here to avoid counting this
488 * as a dropped packed. */
489 sta->rx_packets++;
490 dev_kfree_skb(rx->skb);
491 return TXRX_QUEUED;
492 }
493
494 return TXRX_CONTINUE;
495 } /* ieee80211_rx_h_sta_process */
496
497 static ieee80211_txrx_result
498 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
499 {
500 if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
501 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
502 !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match)
503 return TXRX_CONTINUE;
504
505 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
506 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
507 rx->key->force_sw_encrypt) {
508 u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
509 if (iv) {
510 rx->sta->wep_weak_iv_count++;
511 }
512 }
513
514 return TXRX_CONTINUE;
515 }
516
517 static ieee80211_txrx_result
518 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
519 {
520 /* If the device handles decryption totally, skip this test */
521 if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
522 return TXRX_CONTINUE;
523
524 if ((rx->key && rx->key->alg != ALG_WEP) ||
525 !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
526 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
527 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
528 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
529 return TXRX_CONTINUE;
530
531 if (!rx->key) {
532 if (net_ratelimit())
533 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
534 rx->dev->name);
535 return TXRX_DROP;
536 }
537
538 if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
539 rx->key->force_sw_encrypt) {
540 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
541 if (net_ratelimit())
542 printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
543 "failed\n", rx->dev->name);
544 return TXRX_DROP;
545 }
546 } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
547 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
548 /* remove ICV */
549 skb_trim(rx->skb, rx->skb->len - 4);
550 }
551
552 return TXRX_CONTINUE;
553 }
554
555 static inline struct ieee80211_fragment_entry *
556 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
557 unsigned int frag, unsigned int seq, int rx_queue,
558 struct sk_buff **skb)
559 {
560 struct ieee80211_fragment_entry *entry;
561 int idx;
562
563 idx = sdata->fragment_next;
564 entry = &sdata->fragments[sdata->fragment_next++];
565 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
566 sdata->fragment_next = 0;
567
568 if (!skb_queue_empty(&entry->skb_list)) {
569 #ifdef CONFIG_MAC80211_DEBUG
570 struct ieee80211_hdr *hdr =
571 (struct ieee80211_hdr *) entry->skb_list.next->data;
572 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
573 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
574 "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
575 sdata->dev->name, idx,
576 jiffies - entry->first_frag_time, entry->seq,
577 entry->last_frag, MAC_ARG(hdr->addr1),
578 MAC_ARG(hdr->addr2));
579 #endif /* CONFIG_MAC80211_DEBUG */
580 __skb_queue_purge(&entry->skb_list);
581 }
582
583 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
584 *skb = NULL;
585 entry->first_frag_time = jiffies;
586 entry->seq = seq;
587 entry->rx_queue = rx_queue;
588 entry->last_frag = frag;
589 entry->ccmp = 0;
590 entry->extra_len = 0;
591
592 return entry;
593 }
594
595 static inline struct ieee80211_fragment_entry *
596 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
597 u16 fc, unsigned int frag, unsigned int seq,
598 int rx_queue, struct ieee80211_hdr *hdr)
599 {
600 struct ieee80211_fragment_entry *entry;
601 int i, idx;
602
603 idx = sdata->fragment_next;
604 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
605 struct ieee80211_hdr *f_hdr;
606 u16 f_fc;
607
608 idx--;
609 if (idx < 0)
610 idx = IEEE80211_FRAGMENT_MAX - 1;
611
612 entry = &sdata->fragments[idx];
613 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
614 entry->rx_queue != rx_queue ||
615 entry->last_frag + 1 != frag)
616 continue;
617
618 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
619 f_fc = le16_to_cpu(f_hdr->frame_control);
620
621 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
622 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
623 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
624 continue;
625
626 if (entry->first_frag_time + 2 * HZ < jiffies) {
627 __skb_queue_purge(&entry->skb_list);
628 continue;
629 }
630 return entry;
631 }
632
633 return NULL;
634 }
635
636 static ieee80211_txrx_result
637 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
638 {
639 struct ieee80211_hdr *hdr;
640 u16 sc;
641 unsigned int frag, seq;
642 struct ieee80211_fragment_entry *entry;
643 struct sk_buff *skb;
644
645 hdr = (struct ieee80211_hdr *) rx->skb->data;
646 sc = le16_to_cpu(hdr->seq_ctrl);
647 frag = sc & IEEE80211_SCTL_FRAG;
648
649 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
650 (rx->skb)->len < 24 ||
651 is_multicast_ether_addr(hdr->addr1))) {
652 /* not fragmented */
653 goto out;
654 }
655 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
656
657 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
658
659 if (frag == 0) {
660 /* This is the first fragment of a new frame. */
661 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
662 rx->u.rx.queue, &(rx->skb));
663 if (rx->key && rx->key->alg == ALG_CCMP &&
664 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
665 /* Store CCMP PN so that we can verify that the next
666 * fragment has a sequential PN value. */
667 entry->ccmp = 1;
668 memcpy(entry->last_pn,
669 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
670 CCMP_PN_LEN);
671 }
672 return TXRX_QUEUED;
673 }
674
675 /* This is a fragment for a frame that should already be pending in
676 * fragment cache. Add this fragment to the end of the pending entry.
677 */
678 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
679 rx->u.rx.queue, hdr);
680 if (!entry) {
681 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
682 return TXRX_DROP;
683 }
684
685 /* Verify that MPDUs within one MSDU have sequential PN values.
686 * (IEEE 802.11i, 8.3.3.4.5) */
687 if (entry->ccmp) {
688 int i;
689 u8 pn[CCMP_PN_LEN], *rpn;
690 if (!rx->key || rx->key->alg != ALG_CCMP)
691 return TXRX_DROP;
692 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
693 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
694 pn[i]++;
695 if (pn[i])
696 break;
697 }
698 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
699 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
700 if (net_ratelimit())
701 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
702 "sequential A2=" MAC_FMT
703 " PN=%02x%02x%02x%02x%02x%02x "
704 "(expected %02x%02x%02x%02x%02x%02x)\n",
705 rx->dev->name, MAC_ARG(hdr->addr2),
706 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
707 rpn[5], pn[0], pn[1], pn[2], pn[3],
708 pn[4], pn[5]);
709 return TXRX_DROP;
710 }
711 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
712 }
713
714 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
715 __skb_queue_tail(&entry->skb_list, rx->skb);
716 entry->last_frag = frag;
717 entry->extra_len += rx->skb->len;
718 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
719 rx->skb = NULL;
720 return TXRX_QUEUED;
721 }
722
723 rx->skb = __skb_dequeue(&entry->skb_list);
724 if (skb_tailroom(rx->skb) < entry->extra_len) {
725 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
726 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
727 GFP_ATOMIC))) {
728 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
729 __skb_queue_purge(&entry->skb_list);
730 return TXRX_DROP;
731 }
732 }
733 while ((skb = __skb_dequeue(&entry->skb_list))) {
734 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
735 dev_kfree_skb(skb);
736 }
737
738 /* Complete frame has been reassembled - process it now */
739 rx->fragmented = 1;
740
741 out:
742 if (rx->sta)
743 rx->sta->rx_packets++;
744 if (is_multicast_ether_addr(hdr->addr1))
745 rx->local->dot11MulticastReceivedFrameCount++;
746 else
747 ieee80211_led_rx(rx->local);
748 return TXRX_CONTINUE;
749 }
750
751 static ieee80211_txrx_result
752 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
753 {
754 struct sk_buff *skb;
755 int no_pending_pkts;
756
757 if (likely(!rx->sta ||
758 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
759 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
760 !rx->u.rx.ra_match))
761 return TXRX_CONTINUE;
762
763 skb = skb_dequeue(&rx->sta->tx_filtered);
764 if (!skb) {
765 skb = skb_dequeue(&rx->sta->ps_tx_buf);
766 if (skb)
767 rx->local->total_ps_buffered--;
768 }
769 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
770 skb_queue_empty(&rx->sta->ps_tx_buf);
771
772 if (skb) {
773 struct ieee80211_hdr *hdr =
774 (struct ieee80211_hdr *) skb->data;
775
776 /* tell TX path to send one frame even though the STA may
777 * still remain is PS mode after this frame exchange */
778 rx->sta->pspoll = 1;
779
780 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
781 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
782 "after %d)\n",
783 MAC_ARG(rx->sta->addr), rx->sta->aid,
784 skb_queue_len(&rx->sta->ps_tx_buf));
785 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
786
787 /* Use MoreData flag to indicate whether there are more
788 * buffered frames for this STA */
789 if (no_pending_pkts) {
790 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
791 rx->sta->flags &= ~WLAN_STA_TIM;
792 } else
793 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
794
795 dev_queue_xmit(skb);
796
797 if (no_pending_pkts) {
798 if (rx->local->ops->set_tim)
799 rx->local->ops->set_tim(local_to_hw(rx->local),
800 rx->sta->aid, 0);
801 if (rx->sdata->bss)
802 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
803 }
804 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
805 } else if (!rx->u.rx.sent_ps_buffered) {
806 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
807 "though there is no buffered frames for it\n",
808 rx->dev->name, MAC_ARG(rx->sta->addr));
809 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
810
811 }
812
813 /* Free PS Poll skb here instead of returning TXRX_DROP that would
814 * count as an dropped frame. */
815 dev_kfree_skb(rx->skb);
816
817 return TXRX_QUEUED;
818 }
819
820 static ieee80211_txrx_result
821 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
822 {
823 u16 fc = rx->fc;
824 u8 *data = rx->skb->data;
825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
826
827 if (!WLAN_FC_IS_QOS_DATA(fc))
828 return TXRX_CONTINUE;
829
830 /* remove the qos control field, update frame type and meta-data */
831 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
832 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
833 /* change frame type to non QOS */
834 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
835 hdr->frame_control = cpu_to_le16(fc);
836
837 return TXRX_CONTINUE;
838 }
839
840 static ieee80211_txrx_result
841 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
842 {
843 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
844 rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) {
845 /* Pass both encrypted and unencrypted EAPOL frames to user
846 * space for processing. */
847 if (!rx->local->apdev)
848 return TXRX_DROP;
849 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
850 ieee80211_msg_normal);
851 return TXRX_QUEUED;
852 }
853
854 if (unlikely(rx->sdata->ieee802_1x &&
855 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
856 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
857 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
858 !ieee80211_is_eapol(rx->skb))) {
859 #ifdef CONFIG_MAC80211_DEBUG
860 struct ieee80211_hdr *hdr =
861 (struct ieee80211_hdr *) rx->skb->data;
862 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
863 " (unauthorized port)\n", rx->dev->name,
864 MAC_ARG(hdr->addr2));
865 #endif /* CONFIG_MAC80211_DEBUG */
866 return TXRX_DROP;
867 }
868
869 return TXRX_CONTINUE;
870 }
871
872 static ieee80211_txrx_result
873 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
874 {
875 /* If the device handles decryption totally, skip this test */
876 if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
877 return TXRX_CONTINUE;
878
879 /* Drop unencrypted frames if key is set. */
880 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
881 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
882 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
883 (rx->key || rx->sdata->drop_unencrypted) &&
884 (rx->sdata->eapol == 0 ||
885 !ieee80211_is_eapol(rx->skb)))) {
886 if (net_ratelimit())
887 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
888 "encryption\n", rx->dev->name);
889 return TXRX_DROP;
890 }
891 return TXRX_CONTINUE;
892 }
893
894 static ieee80211_txrx_result
895 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
896 {
897 struct net_device *dev = rx->dev;
898 struct ieee80211_local *local = rx->local;
899 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
900 u16 fc, hdrlen, ethertype;
901 u8 *payload;
902 u8 dst[ETH_ALEN];
903 u8 src[ETH_ALEN];
904 struct sk_buff *skb = rx->skb, *skb2;
905 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
906
907 fc = rx->fc;
908 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
909 return TXRX_CONTINUE;
910
911 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
912 return TXRX_DROP;
913
914 hdrlen = ieee80211_get_hdrlen(fc);
915
916 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
917 * header
918 * IEEE 802.11 address fields:
919 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
920 * 0 0 DA SA BSSID n/a
921 * 0 1 DA BSSID SA n/a
922 * 1 0 BSSID SA DA n/a
923 * 1 1 RA TA DA SA
924 */
925
926 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
927 case IEEE80211_FCTL_TODS:
928 /* BSSID SA DA */
929 memcpy(dst, hdr->addr3, ETH_ALEN);
930 memcpy(src, hdr->addr2, ETH_ALEN);
931
932 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
933 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
934 if (net_ratelimit())
935 printk(KERN_DEBUG "%s: dropped ToDS frame "
936 "(BSSID=" MAC_FMT
937 " SA=" MAC_FMT
938 " DA=" MAC_FMT ")\n",
939 dev->name,
940 MAC_ARG(hdr->addr1),
941 MAC_ARG(hdr->addr2),
942 MAC_ARG(hdr->addr3));
943 return TXRX_DROP;
944 }
945 break;
946 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
947 /* RA TA DA SA */
948 memcpy(dst, hdr->addr3, ETH_ALEN);
949 memcpy(src, hdr->addr4, ETH_ALEN);
950
951 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
952 if (net_ratelimit())
953 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
954 "frame (RA=" MAC_FMT
955 " TA=" MAC_FMT " DA=" MAC_FMT
956 " SA=" MAC_FMT ")\n",
957 rx->dev->name,
958 MAC_ARG(hdr->addr1),
959 MAC_ARG(hdr->addr2),
960 MAC_ARG(hdr->addr3),
961 MAC_ARG(hdr->addr4));
962 return TXRX_DROP;
963 }
964 break;
965 case IEEE80211_FCTL_FROMDS:
966 /* DA BSSID SA */
967 memcpy(dst, hdr->addr1, ETH_ALEN);
968 memcpy(src, hdr->addr3, ETH_ALEN);
969
970 if (sdata->type != IEEE80211_IF_TYPE_STA) {
971 return TXRX_DROP;
972 }
973 break;
974 case 0:
975 /* DA SA BSSID */
976 memcpy(dst, hdr->addr1, ETH_ALEN);
977 memcpy(src, hdr->addr2, ETH_ALEN);
978
979 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
980 if (net_ratelimit()) {
981 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
982 MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
983 ")\n",
984 dev->name, MAC_ARG(hdr->addr1),
985 MAC_ARG(hdr->addr2),
986 MAC_ARG(hdr->addr3));
987 }
988 return TXRX_DROP;
989 }
990 break;
991 }
992
993 payload = skb->data + hdrlen;
994
995 if (unlikely(skb->len - hdrlen < 8)) {
996 if (net_ratelimit()) {
997 printk(KERN_DEBUG "%s: RX too short data frame "
998 "payload\n", dev->name);
999 }
1000 return TXRX_DROP;
1001 }
1002
1003 ethertype = (payload[6] << 8) | payload[7];
1004
1005 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1006 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1007 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1008 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1009 * replace EtherType */
1010 skb_pull(skb, hdrlen + 6);
1011 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1012 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1013 } else {
1014 struct ethhdr *ehdr;
1015 __be16 len;
1016 skb_pull(skb, hdrlen);
1017 len = htons(skb->len);
1018 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1019 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1020 memcpy(ehdr->h_source, src, ETH_ALEN);
1021 ehdr->h_proto = len;
1022 }
1023 skb->dev = dev;
1024
1025 skb2 = NULL;
1026
1027 sdata->stats.rx_packets++;
1028 sdata->stats.rx_bytes += skb->len;
1029
1030 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1031 || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) {
1032 if (is_multicast_ether_addr(skb->data)) {
1033 /* send multicast frames both to higher layers in
1034 * local net stack and back to the wireless media */
1035 skb2 = skb_copy(skb, GFP_ATOMIC);
1036 if (!skb2 && net_ratelimit())
1037 printk(KERN_DEBUG "%s: failed to clone "
1038 "multicast frame\n", dev->name);
1039 } else {
1040 struct sta_info *dsta;
1041 dsta = sta_info_get(local, skb->data);
1042 if (dsta && !dsta->dev) {
1043 if (net_ratelimit())
1044 printk(KERN_DEBUG "Station with null "
1045 "dev structure!\n");
1046 } else if (dsta && dsta->dev == dev) {
1047 /* Destination station is associated to this
1048 * AP, so send the frame directly to it and
1049 * do not pass the frame to local net stack.
1050 */
1051 skb2 = skb;
1052 skb = NULL;
1053 }
1054 if (dsta)
1055 sta_info_put(dsta);
1056 }
1057 }
1058
1059 if (skb) {
1060 /* deliver to local stack */
1061 skb->protocol = eth_type_trans(skb, dev);
1062 memset(skb->cb, 0, sizeof(skb->cb));
1063 netif_rx(skb);
1064 }
1065
1066 if (skb2) {
1067 /* send to wireless media */
1068 skb2->protocol = __constant_htons(ETH_P_802_3);
1069 skb_set_network_header(skb2, 0);
1070 skb_set_mac_header(skb2, 0);
1071 dev_queue_xmit(skb2);
1072 }
1073
1074 return TXRX_QUEUED;
1075 }
1076
1077 static ieee80211_txrx_result
1078 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1079 {
1080 struct ieee80211_sub_if_data *sdata;
1081
1082 if (!rx->u.rx.ra_match)
1083 return TXRX_DROP;
1084
1085 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1086 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1087 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1088 !rx->local->user_space_mlme) {
1089 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1090 } else {
1091 /* Management frames are sent to hostapd for processing */
1092 if (!rx->local->apdev)
1093 return TXRX_DROP;
1094 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1095 ieee80211_msg_normal);
1096 }
1097 return TXRX_QUEUED;
1098 }
1099
1100 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1101 struct ieee80211_local *local,
1102 ieee80211_rx_handler *handlers,
1103 struct ieee80211_txrx_data *rx,
1104 struct sta_info *sta)
1105 {
1106 ieee80211_rx_handler *handler;
1107 ieee80211_txrx_result res = TXRX_DROP;
1108
1109 for (handler = handlers; *handler != NULL; handler++) {
1110 res = (*handler)(rx);
1111
1112 switch (res) {
1113 case TXRX_CONTINUE:
1114 continue;
1115 case TXRX_DROP:
1116 I802_DEBUG_INC(local->rx_handlers_drop);
1117 if (sta)
1118 sta->rx_dropped++;
1119 break;
1120 case TXRX_QUEUED:
1121 I802_DEBUG_INC(local->rx_handlers_queued);
1122 break;
1123 }
1124 break;
1125 }
1126
1127 if (res == TXRX_DROP)
1128 dev_kfree_skb(rx->skb);
1129 return res;
1130 }
1131
1132 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1133 ieee80211_rx_handler *handlers,
1134 struct ieee80211_txrx_data *rx,
1135 struct sta_info *sta)
1136 {
1137 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1138 TXRX_CONTINUE)
1139 dev_kfree_skb(rx->skb);
1140 }
1141
1142 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1143 struct ieee80211_hdr *hdr,
1144 struct sta_info *sta,
1145 struct ieee80211_txrx_data *rx)
1146 {
1147 int keyidx, hdrlen;
1148
1149 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1150 if (rx->skb->len >= hdrlen + 4)
1151 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1152 else
1153 keyidx = -1;
1154
1155 /* TODO: verify that this is not triggered by fragmented
1156 * frames (hw does not verify MIC for them). */
1157 if (net_ratelimit())
1158 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1159 "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
1160 dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1),
1161 keyidx);
1162
1163 if (!sta) {
1164 /* Some hardware versions seem to generate incorrect
1165 * Michael MIC reports; ignore them to avoid triggering
1166 * countermeasures. */
1167 if (net_ratelimit())
1168 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1169 "error for unknown address " MAC_FMT "\n",
1170 dev->name, MAC_ARG(hdr->addr2));
1171 goto ignore;
1172 }
1173
1174 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1175 if (net_ratelimit())
1176 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1177 "error for a frame with no ISWEP flag (src "
1178 MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
1179 goto ignore;
1180 }
1181
1182 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
1183 rx->sdata->type == IEEE80211_IF_TYPE_AP) {
1184 keyidx = ieee80211_wep_get_keyidx(rx->skb);
1185 /* AP with Pairwise keys support should never receive Michael
1186 * MIC errors for non-zero keyidx because these are reserved
1187 * for group keys and only the AP is sending real multicast
1188 * frames in BSS. */
1189 if (keyidx) {
1190 if (net_ratelimit())
1191 printk(KERN_DEBUG "%s: ignored Michael MIC "
1192 "error for a frame with non-zero keyidx"
1193 " (%d) (src " MAC_FMT ")\n", dev->name,
1194 keyidx, MAC_ARG(hdr->addr2));
1195 goto ignore;
1196 }
1197 }
1198
1199 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1200 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1201 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1202 if (net_ratelimit())
1203 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1204 "error for a frame that cannot be encrypted "
1205 "(fc=0x%04x) (src " MAC_FMT ")\n",
1206 dev->name, rx->fc, MAC_ARG(hdr->addr2));
1207 goto ignore;
1208 }
1209
1210 do {
1211 union iwreq_data wrqu;
1212 char *buf = kmalloc(128, GFP_ATOMIC);
1213 if (!buf)
1214 break;
1215
1216 /* TODO: needed parameters: count, key type, TSC */
1217 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
1218 "keyid=%d %scast addr=" MAC_FMT ")",
1219 keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
1220 MAC_ARG(hdr->addr2));
1221 memset(&wrqu, 0, sizeof(wrqu));
1222 wrqu.data.length = strlen(buf);
1223 wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
1224 kfree(buf);
1225 } while (0);
1226
1227 /* TODO: consider verifying the MIC error report with software
1228 * implementation if we get too many spurious reports from the
1229 * hardware. */
1230 if (!rx->local->apdev)
1231 goto ignore;
1232 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1233 ieee80211_msg_michael_mic_failure);
1234 return;
1235
1236 ignore:
1237 dev_kfree_skb(rx->skb);
1238 rx->skb = NULL;
1239 }
1240
1241 ieee80211_rx_handler ieee80211_rx_handlers[] =
1242 {
1243 ieee80211_rx_h_if_stats,
1244 ieee80211_rx_h_monitor,
1245 ieee80211_rx_h_passive_scan,
1246 ieee80211_rx_h_check,
1247 ieee80211_rx_h_load_key,
1248 ieee80211_rx_h_sta_process,
1249 ieee80211_rx_h_ccmp_decrypt,
1250 ieee80211_rx_h_tkip_decrypt,
1251 ieee80211_rx_h_wep_weak_iv_detection,
1252 ieee80211_rx_h_wep_decrypt,
1253 ieee80211_rx_h_defragment,
1254 ieee80211_rx_h_ps_poll,
1255 ieee80211_rx_h_michael_mic_verify,
1256 /* this must be after decryption - so header is counted in MPDU mic
1257 * must be before pae and data, so QOS_DATA format frames
1258 * are not passed to user space by these functions
1259 */
1260 ieee80211_rx_h_remove_qos_control,
1261 ieee80211_rx_h_802_1x_pae,
1262 ieee80211_rx_h_drop_unencrypted,
1263 ieee80211_rx_h_data,
1264 ieee80211_rx_h_mgmt,
1265 NULL
1266 };
1267
1268 /* main receive path */
1269
1270 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1271 u8 *bssid, struct ieee80211_txrx_data *rx,
1272 struct ieee80211_hdr *hdr)
1273 {
1274 int multicast = is_multicast_ether_addr(hdr->addr1);
1275
1276 switch (sdata->type) {
1277 case IEEE80211_IF_TYPE_STA:
1278 if (!bssid)
1279 return 0;
1280 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1281 if (!rx->u.rx.in_scan)
1282 return 0;
1283 rx->u.rx.ra_match = 0;
1284 } else if (!multicast &&
1285 compare_ether_addr(sdata->dev->dev_addr,
1286 hdr->addr1) != 0) {
1287 if (!sdata->promisc)
1288 return 0;
1289 rx->u.rx.ra_match = 0;
1290 }
1291 break;
1292 case IEEE80211_IF_TYPE_IBSS:
1293 if (!bssid)
1294 return 0;
1295 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1296 if (!rx->u.rx.in_scan)
1297 return 0;
1298 rx->u.rx.ra_match = 0;
1299 } else if (!multicast &&
1300 compare_ether_addr(sdata->dev->dev_addr,
1301 hdr->addr1) != 0) {
1302 if (!sdata->promisc)
1303 return 0;
1304 rx->u.rx.ra_match = 0;
1305 } else if (!rx->sta)
1306 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1307 bssid, hdr->addr2);
1308 break;
1309 case IEEE80211_IF_TYPE_AP:
1310 if (!bssid) {
1311 if (compare_ether_addr(sdata->dev->dev_addr,
1312 hdr->addr1))
1313 return 0;
1314 } else if (!ieee80211_bssid_match(bssid,
1315 sdata->dev->dev_addr)) {
1316 if (!rx->u.rx.in_scan)
1317 return 0;
1318 rx->u.rx.ra_match = 0;
1319 }
1320 if (sdata->dev == sdata->local->mdev && !rx->u.rx.in_scan)
1321 /* do not receive anything via
1322 * master device when not scanning */
1323 return 0;
1324 break;
1325 case IEEE80211_IF_TYPE_WDS:
1326 if (bssid ||
1327 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1328 return 0;
1329 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1330 return 0;
1331 break;
1332 }
1333
1334 return 1;
1335 }
1336
1337 /*
1338 * This is the receive path handler. It is called by a low level driver when an
1339 * 802.11 MPDU is received from the hardware.
1340 */
1341 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1342 struct ieee80211_rx_status *status)
1343 {
1344 struct ieee80211_local *local = hw_to_local(hw);
1345 struct ieee80211_sub_if_data *sdata;
1346 struct sta_info *sta;
1347 struct ieee80211_hdr *hdr;
1348 struct ieee80211_txrx_data rx;
1349 u16 type;
1350 int radiotap_len = 0, prepres;
1351 struct ieee80211_sub_if_data *prev = NULL;
1352 struct sk_buff *skb_new;
1353 u8 *bssid;
1354
1355 if (status->flag & RX_FLAG_RADIOTAP) {
1356 radiotap_len = ieee80211_get_radiotap_len(skb->data);
1357 skb_pull(skb, radiotap_len);
1358 }
1359
1360 hdr = (struct ieee80211_hdr *) skb->data;
1361 memset(&rx, 0, sizeof(rx));
1362 rx.skb = skb;
1363 rx.local = local;
1364
1365 rx.u.rx.status = status;
1366 rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
1367 type = rx.fc & IEEE80211_FCTL_FTYPE;
1368 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1369 local->dot11ReceivedFragmentCount++;
1370
1371 if (skb->len >= 16) {
1372 sta = rx.sta = sta_info_get(local, hdr->addr2);
1373 if (sta) {
1374 rx.dev = rx.sta->dev;
1375 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1376 }
1377 } else
1378 sta = rx.sta = NULL;
1379
1380 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1381 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1382 goto end;
1383 }
1384
1385 if (unlikely(local->sta_scanning))
1386 rx.u.rx.in_scan = 1;
1387
1388 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1389 sta) != TXRX_CONTINUE)
1390 goto end;
1391 skb = rx.skb;
1392
1393 skb_push(skb, radiotap_len);
1394 if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
1395 !local->iff_promiscs && !is_multicast_ether_addr(hdr->addr1)) {
1396 rx.u.rx.ra_match = 1;
1397 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1398 rx.sta);
1399 sta_info_put(sta);
1400 return;
1401 }
1402
1403 bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
1404
1405 read_lock(&local->sub_if_lock);
1406 list_for_each_entry(sdata, &local->sub_if_list, list) {
1407 rx.u.rx.ra_match = 1;
1408
1409 if (!netif_running(sdata->dev))
1410 continue;
1411
1412 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1413 /* prepare_for_handlers can change sta */
1414 sta = rx.sta;
1415
1416 if (!prepres)
1417 continue;
1418
1419 /*
1420 * frame is destined for this interface, but if it's not
1421 * also for the previous one we handle that after the
1422 * loop to avoid copying the SKB once too much
1423 */
1424
1425 if (!prev) {
1426 prev = sdata;
1427 continue;
1428 }
1429
1430 /*
1431 * frame was destined for the previous interface
1432 * so invoke RX handlers for it
1433 */
1434
1435 skb_new = skb_copy(skb, GFP_ATOMIC);
1436 if (!skb_new) {
1437 if (net_ratelimit())
1438 printk(KERN_DEBUG "%s: failed to copy "
1439 "multicast frame for %s",
1440 local->mdev->name, prev->dev->name);
1441 continue;
1442 }
1443 rx.skb = skb_new;
1444 rx.dev = prev->dev;
1445 rx.sdata = prev;
1446 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1447 &rx, sta);
1448 prev = sdata;
1449 }
1450 if (prev) {
1451 rx.skb = skb;
1452 rx.dev = prev->dev;
1453 rx.sdata = prev;
1454 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1455 &rx, sta);
1456 } else
1457 dev_kfree_skb(skb);
1458 read_unlock(&local->sub_if_lock);
1459
1460 end:
1461 if (sta)
1462 sta_info_put(sta);
1463 }
1464 EXPORT_SYMBOL(__ieee80211_rx);
1465
1466 /* This is a version of the rx handler that can be called from hard irq
1467 * context. Post the skb on the queue and schedule the tasklet */
1468 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1469 struct ieee80211_rx_status *status)
1470 {
1471 struct ieee80211_local *local = hw_to_local(hw);
1472
1473 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1474
1475 skb->dev = local->mdev;
1476 /* copy status into skb->cb for use by tasklet */
1477 memcpy(skb->cb, status, sizeof(*status));
1478 skb->pkt_type = IEEE80211_RX_MSG;
1479 skb_queue_tail(&local->skb_queue, skb);
1480 tasklet_schedule(&local->tasklet);
1481 }
1482 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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