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[MAC80211]: PS mode fix
[deliverable/linux.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 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>
d4e46a3d 16#include <linux/rcupdate.h>
571ecf67
JB		 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
52865dfd
JB		 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.
571ecf67
JB		 33 */
34
6e0d114d
JB		 35static ieee80211_txrx_result
36ieee80211_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 }
52865dfd 55
6e0d114d 56 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
52865dfd
JB		 57 /* only a debug counter, sta might not be assigned properly yet */
58 if (rx->sta)
6e0d114d 59 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
6e0d114d
JB		 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
571ecf67
JB		 69static ieee80211_txrx_result
70ieee80211_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 ||
571ecf67
JB		 97 (mode->mode == MODE_IEEE80211G &&
98 rate->flags & IEEE80211_RATE_ERP))
99 hdrtime = CHAN_UTIL_HDR_SHORT;
100 else
101 hdrtime = CHAN_UTIL_HDR_LONG;
102
103 load = hdrtime;
104 if (!is_multicast_ether_addr(hdr->addr1))
105 load += hdrtime;
106
107 load += skb->len * rate->rate_inv;
108
109 /* Divide channel_use by 8 to avoid wrapping around the counter */
110 load >>= CHAN_UTIL_SHIFT;
111 local->channel_use_raw += load;
571ecf67
JB		 112 rx->u.rx.load = load;
113
114 return TXRX_CONTINUE;
115}
116
117ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
118{
119 ieee80211_rx_h_parse_qos,
120 ieee80211_rx_h_load_stats,
121 NULL
122};
123
124/* rx handlers */
125
126static ieee80211_txrx_result
127ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
128{
52865dfd
JB		 129 if (rx->sta)
130 rx->sta->channel_use_raw += rx->u.rx.load;
571ecf67
JB		 131 rx->sdata->channel_use_raw += rx->u.rx.load;
132 return TXRX_CONTINUE;
133}
134
135static void
136ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
137 struct ieee80211_rx_status *status)
138{
139 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
571ecf67
JB		 140 struct ieee80211_rate *rate;
141 struct ieee80211_rtap_hdr {
142 struct ieee80211_radiotap_header hdr;
143 u8 flags;
144 u8 rate;
145 __le16 chan_freq;
146 __le16 chan_flags;
147 u8 antsignal;
148 } __attribute__ ((packed)) *rthdr;
149
150 skb->dev = dev;
151
571ecf67
JB		 152 if (status->flag & RX_FLAG_RADIOTAP)
153 goto out;
154
155 if (skb_headroom(skb) < sizeof(*rthdr)) {
156 I802_DEBUG_INC(local->rx_expand_skb_head);
157 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
158 dev_kfree_skb(skb);
159 return;
160 }
161 }
162
163 rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
164 memset(rthdr, 0, sizeof(*rthdr));
165 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
166 rthdr->hdr.it_present =
167 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
168 (1 << IEEE80211_RADIOTAP_RATE) |
169 (1 << IEEE80211_RADIOTAP_CHANNEL) |
170 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
171 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
172 IEEE80211_RADIOTAP_F_FCS : 0;
173 rate = ieee80211_get_rate(local, status->phymode, status->rate);
174 if (rate)
175 rthdr->rate = rate->rate / 5;
176 rthdr->chan_freq = cpu_to_le16(status->freq);
177 rthdr->chan_flags =
178 status->phymode == MODE_IEEE80211A ?
179 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
180 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
181 rthdr->antsignal = status->ssi;
182
183 out:
68aae116
SH		 184 dev->stats.rx_packets++;
185 dev->stats.rx_bytes += skb->len;
571ecf67
JB		 186
187 skb_set_mac_header(skb, 0);
188 skb->ip_summed = CHECKSUM_UNNECESSARY;
189 skb->pkt_type = PACKET_OTHERHOST;
190 skb->protocol = htons(ETH_P_802_2);
191 memset(skb->cb, 0, sizeof(skb->cb));
192 netif_rx(skb);
193}
194
195static ieee80211_txrx_result
196ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
197{
198 if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
199 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
200 return TXRX_QUEUED;
201 }
202
203 if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
204 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data));
205
206 return TXRX_CONTINUE;
207}
208
209static ieee80211_txrx_result
210ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
211{
212 struct ieee80211_local *local = rx->local;
213 struct sk_buff *skb = rx->skb;
214
215 if (unlikely(local->sta_scanning != 0)) {
216 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
217 return TXRX_QUEUED;
218 }
219
badffb72 220 if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
571ecf67
JB		 221 /* scanning finished during invoking of handlers */
222 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
223 return TXRX_DROP;
224 }
225
226 return TXRX_CONTINUE;
227}
228
229static ieee80211_txrx_result
230ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
231{
232 struct ieee80211_hdr *hdr;
571ecf67
JB		 233 hdr = (struct ieee80211_hdr *) rx->skb->data;
234
235 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
236 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
237 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
238 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
239 hdr->seq_ctrl)) {
badffb72 240 if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
571ecf67
JB		 241 rx->local->dot11FrameDuplicateCount++;
242 rx->sta->num_duplicates++;
243 }
244 return TXRX_DROP;
245 } else
246 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
247 }
248
249 if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
250 rx->skb->len > FCS_LEN)
251 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
252
253 if (unlikely(rx->skb->len < 16)) {
254 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
255 return TXRX_DROP;
256 }
257
badffb72 258 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
571ecf67
JB		 259 rx->skb->pkt_type = PACKET_OTHERHOST;
260 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
261 rx->skb->pkt_type = PACKET_HOST;
262 else if (is_multicast_ether_addr(hdr->addr1)) {
263 if (is_broadcast_ether_addr(hdr->addr1))
264 rx->skb->pkt_type = PACKET_BROADCAST;
265 else
266 rx->skb->pkt_type = PACKET_MULTICAST;
267 } else
268 rx->skb->pkt_type = PACKET_OTHERHOST;
269
270 /* Drop disallowed frame classes based on STA auth/assoc state;
271 * IEEE 802.11, Chap 5.5.
272 *
273 * 80211.o does filtering only based on association state, i.e., it
274 * drops Class 3 frames from not associated stations. hostapd sends
275 * deauth/disassoc frames when needed. In addition, hostapd is
276 * responsible for filtering on both auth and assoc states.
277 */
278 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
279 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
280 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
281 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
282 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
283 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
284 !(rx->fc & IEEE80211_FCTL_TODS) &&
285 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
badffb72 286 || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
571ecf67
JB		 287 /* Drop IBSS frames and frames for other hosts
288 * silently. */
289 return TXRX_DROP;
290 }
291
292 if (!rx->local->apdev)
293 return TXRX_DROP;
294
295 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
296 ieee80211_msg_sta_not_assoc);
297 return TXRX_QUEUED;
298 }
299
570bd537
JB		 300 return TXRX_CONTINUE;
301}
302
303
304static ieee80211_txrx_result
305ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
306{
307 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
3017b80b
JB		 308 int keyidx;
309 int hdrlen;
d4e46a3d 310 struct ieee80211_key *stakey = NULL;
570bd537 311
3017b80b
JB		 312 /*
313 * Key selection 101
314 *
315 * There are three types of keys:
316 * - GTK (group keys)
317 * - PTK (pairwise keys)
318 * - STK (station-to-station pairwise keys)
319 *
320 * When selecting a key, we have to distinguish between multicast
321 * (including broadcast) and unicast frames, the latter can only
322 * use PTKs and STKs while the former always use GTKs. Unless, of
323 * course, actual WEP keys ("pre-RSNA") are used, then unicast
324 * frames can also use key indizes like GTKs. Hence, if we don't
325 * have a PTK/STK we check the key index for a WEP key.
326 *
8dc06a1c
JB		 327 * Note that in a regular BSS, multicast frames are sent by the
328 * AP only, associated stations unicast the frame to the AP first
329 * which then multicasts it on their behalf.
330 *
3017b80b
JB		 331 * There is also a slight problem in IBSS mode: GTKs are negotiated
332 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 333 * The spec seems to expect that one negotiates the same key with
334 * every station but there's no such requirement; VLANs could be
335 * possible.
3017b80b
JB		 336 */
337
338 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
339 return TXRX_CONTINUE;
571ecf67 340
3017b80b
JB		 341 /*
342 * No point in finding a key if the frame is neither
343 * addressed to us nor a multicast frame.
344 */
badffb72 345 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
3017b80b
JB		 346 return TXRX_CONTINUE;
347
d4e46a3d
JB		 348 if (rx->sta)
349 stakey = rcu_dereference(rx->sta->key);
350
351 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
352 rx->key = stakey;
571ecf67 353 } else {
3017b80b
JB		 354 /*
355 * The device doesn't give us the IV so we won't be
356 * able to look up the key. That's ok though, we
357 * don't need to decrypt the frame, we just won't
358 * be able to keep statistics accurate.
359 * Except for key threshold notifications, should
360 * we somehow allow the driver to tell us which key
361 * the hardware used if this flag is set?
362 */
7848ba7d
JB		 363 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
364 (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
3017b80b
JB		 365 return TXRX_CONTINUE;
366
367 hdrlen = ieee80211_get_hdrlen(rx->fc);
368
369 if (rx->skb->len < 8 + hdrlen)
370 return TXRX_DROP; /* TODO: count this? */
371
372 /*
373 * no need to call ieee80211_wep_get_keyidx,
374 * it verifies a bunch of things we've done already
375 */
376 keyidx = rx->skb->data[hdrlen + 3] >> 6;
377
d4e46a3d 378 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
3017b80b
JB		 379
380 /*
381 * RSNA-protected unicast frames should always be sent with
382 * pairwise or station-to-station keys, but for WEP we allow
383 * using a key index as well.
384 */
8f20fc24 385 if (rx->key && rx->key->conf.alg != ALG_WEP &&
3017b80b
JB		 386 !is_multicast_ether_addr(hdr->addr1))
387 rx->key = NULL;
571ecf67
JB		 388 }
389
3017b80b 390 if (rx->key) {
571ecf67
JB		 391 rx->key->tx_rx_count++;
392 if (unlikely(rx->local->key_tx_rx_threshold &&
393 rx->key->tx_rx_count >
394 rx->local->key_tx_rx_threshold)) {
395 ieee80211_key_threshold_notify(rx->dev, rx->key,
396 rx->sta);
397 }
398 }
399
400 return TXRX_CONTINUE;
401}
402
403static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
404{
405 struct ieee80211_sub_if_data *sdata;
406 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
407
408 if (sdata->bss)
409 atomic_inc(&sdata->bss->num_sta_ps);
410 sta->flags |= WLAN_STA_PS;
411 sta->pspoll = 0;
412#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
413 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
414 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
415#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
416}
417
418static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
419{
420 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
421 struct sk_buff *skb;
422 int sent = 0;
423 struct ieee80211_sub_if_data *sdata;
424 struct ieee80211_tx_packet_data *pkt_data;
425
426 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
427 if (sdata->bss)
428 atomic_dec(&sdata->bss->num_sta_ps);
429 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
430 sta->pspoll = 0;
431 if (!skb_queue_empty(&sta->ps_tx_buf)) {
432 if (local->ops->set_tim)
433 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
434 if (sdata->bss)
435 bss_tim_clear(local, sdata->bss, sta->aid);
436 }
437#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
438 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
439 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
440#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
441 /* Send all buffered frames to the station */
442 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
443 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
444 sent++;
e8bf9649 445 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
571ecf67
JB		 446 dev_queue_xmit(skb);
447 }
448 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
449 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
450 local->total_ps_buffered--;
451 sent++;
452#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
453 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
454 "since STA not sleeping anymore\n", dev->name,
455 MAC_ARG(sta->addr), sta->aid);
456#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
e8bf9649 457 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
571ecf67
JB		 458 dev_queue_xmit(skb);
459 }
460
461 return sent;
462}
463
464static ieee80211_txrx_result
465ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
466{
467 struct sta_info *sta = rx->sta;
468 struct net_device *dev = rx->dev;
469 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
470
471 if (!sta)
472 return TXRX_CONTINUE;
473
474 /* Update last_rx only for IBSS packets which are for the current
475 * BSSID to avoid keeping the current IBSS network alive in cases where
476 * other STAs are using different BSSID. */
477 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
478 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
479 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
480 sta->last_rx = jiffies;
481 } else
482 if (!is_multicast_ether_addr(hdr->addr1) ||
483 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
484 /* Update last_rx only for unicast frames in order to prevent
485 * the Probe Request frames (the only broadcast frames from a
486 * STA in infrastructure mode) from keeping a connection alive.
487 */
488 sta->last_rx = jiffies;
489 }
490
badffb72 491 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
571ecf67
JB		 492 return TXRX_CONTINUE;
493
494 sta->rx_fragments++;
495 sta->rx_bytes += rx->skb->len;
6c55aa97
LF		 496 sta->last_rssi = rx->u.rx.status->ssi;
497 sta->last_signal = rx->u.rx.status->signal;
498 sta->last_noise = rx->u.rx.status->noise;
571ecf67
JB		 499
500 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
501 /* Change STA power saving mode only in the end of a frame
502 * exchange sequence */
503 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
504 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
505 else if (!(sta->flags & WLAN_STA_PS) &&
506 (rx->fc & IEEE80211_FCTL_PM))
507 ap_sta_ps_start(dev, sta);
508 }
509
510 /* Drop data::nullfunc frames silently, since they are used only to
511 * control station power saving mode. */
512 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
513 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
514 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
515 /* Update counter and free packet here to avoid counting this
516 * as a dropped packed. */
517 sta->rx_packets++;
518 dev_kfree_skb(rx->skb);
519 return TXRX_QUEUED;
520 }
521
522 return TXRX_CONTINUE;
523} /* ieee80211_rx_h_sta_process */
524
525static ieee80211_txrx_result
526ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
527{
528 if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
529 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
8f20fc24 530 !rx->key || rx->key->conf.alg != ALG_WEP ||
badffb72 531 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
571ecf67
JB		 532 return TXRX_CONTINUE;
533
534 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
7848ba7d
JB		 535 if (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
536 !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED))
8f20fc24 537 if (ieee80211_wep_is_weak_iv(rx->skb, rx->key))
571ecf67 538 rx->sta->wep_weak_iv_count++;
571ecf67
JB		 539
540 return TXRX_CONTINUE;
541}
542
543static ieee80211_txrx_result
544ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
545{
8f20fc24 546 if ((rx->key && rx->key->conf.alg != ALG_WEP) ||
571ecf67
JB		 547 !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
548 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
549 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
550 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
551 return TXRX_CONTINUE;
552
553 if (!rx->key) {
1a84f3fd
JB		 554 if (net_ratelimit())
555 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
556 rx->dev->name);
571ecf67
JB		 557 return TXRX_DROP;
558 }
559
7848ba7d 560 if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) {
571ecf67 561 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
1a84f3fd
JB		 562 if (net_ratelimit())
563 printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
564 "failed\n", rx->dev->name);
571ecf67
JB		 565 return TXRX_DROP;
566 }
7848ba7d 567 } else if (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED)) {
571ecf67
JB		 568 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
569 /* remove ICV */
570 skb_trim(rx->skb, rx->skb->len - 4);
571 }
572
573 return TXRX_CONTINUE;
574}
575
576static inline struct ieee80211_fragment_entry *
577ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
578 unsigned int frag, unsigned int seq, int rx_queue,
579 struct sk_buff **skb)
580{
581 struct ieee80211_fragment_entry *entry;
582 int idx;
583
584 idx = sdata->fragment_next;
585 entry = &sdata->fragments[sdata->fragment_next++];
586 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
587 sdata->fragment_next = 0;
588
589 if (!skb_queue_empty(&entry->skb_list)) {
590#ifdef CONFIG_MAC80211_DEBUG
591 struct ieee80211_hdr *hdr =
592 (struct ieee80211_hdr *) entry->skb_list.next->data;
593 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
594 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
595 "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
596 sdata->dev->name, idx,
597 jiffies - entry->first_frag_time, entry->seq,
598 entry->last_frag, MAC_ARG(hdr->addr1),
599 MAC_ARG(hdr->addr2));
600#endif /* CONFIG_MAC80211_DEBUG */
601 __skb_queue_purge(&entry->skb_list);
602 }
603
604 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
605 *skb = NULL;
606 entry->first_frag_time = jiffies;
607 entry->seq = seq;
608 entry->rx_queue = rx_queue;
609 entry->last_frag = frag;
610 entry->ccmp = 0;
611 entry->extra_len = 0;
612
613 return entry;
614}
615
616static inline struct ieee80211_fragment_entry *
617ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
618 u16 fc, unsigned int frag, unsigned int seq,
619 int rx_queue, struct ieee80211_hdr *hdr)
620{
621 struct ieee80211_fragment_entry *entry;
622 int i, idx;
623
624 idx = sdata->fragment_next;
625 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
626 struct ieee80211_hdr *f_hdr;
627 u16 f_fc;
628
629 idx--;
630 if (idx < 0)
631 idx = IEEE80211_FRAGMENT_MAX - 1;
632
633 entry = &sdata->fragments[idx];
634 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
635 entry->rx_queue != rx_queue ||
636 entry->last_frag + 1 != frag)
637 continue;
638
639 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
640 f_fc = le16_to_cpu(f_hdr->frame_control);
641
642 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
643 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
644 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
645 continue;
646
647 if (entry->first_frag_time + 2 * HZ < jiffies) {
648 __skb_queue_purge(&entry->skb_list);
649 continue;
650 }
651 return entry;
652 }
653
654 return NULL;
655}
656
657static ieee80211_txrx_result
658ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
659{
660 struct ieee80211_hdr *hdr;
661 u16 sc;
662 unsigned int frag, seq;
663 struct ieee80211_fragment_entry *entry;
664 struct sk_buff *skb;
665
666 hdr = (struct ieee80211_hdr *) rx->skb->data;
667 sc = le16_to_cpu(hdr->seq_ctrl);
668 frag = sc & IEEE80211_SCTL_FRAG;
669
670 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
671 (rx->skb)->len < 24 ||
672 is_multicast_ether_addr(hdr->addr1))) {
673 /* not fragmented */
674 goto out;
675 }
676 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
677
678 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
679
680 if (frag == 0) {
681 /* This is the first fragment of a new frame. */
682 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
683 rx->u.rx.queue, &(rx->skb));
8f20fc24 684 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
571ecf67
JB		 685 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
686 /* Store CCMP PN so that we can verify that the next
687 * fragment has a sequential PN value. */
688 entry->ccmp = 1;
689 memcpy(entry->last_pn,
690 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
691 CCMP_PN_LEN);
692 }
693 return TXRX_QUEUED;
694 }
695
696 /* This is a fragment for a frame that should already be pending in
697 * fragment cache. Add this fragment to the end of the pending entry.
698 */
699 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
700 rx->u.rx.queue, hdr);
701 if (!entry) {
702 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
703 return TXRX_DROP;
704 }
705
706 /* Verify that MPDUs within one MSDU have sequential PN values.
707 * (IEEE 802.11i, 8.3.3.4.5) */
708 if (entry->ccmp) {
709 int i;
710 u8 pn[CCMP_PN_LEN], *rpn;
8f20fc24 711 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
571ecf67
JB		 712 return TXRX_DROP;
713 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
714 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
715 pn[i]++;
716 if (pn[i])
717 break;
718 }
719 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
720 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
1a84f3fd
JB		 721 if (net_ratelimit())
722 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
723 "sequential A2=" MAC_FMT
724 " PN=%02x%02x%02x%02x%02x%02x "
725 "(expected %02x%02x%02x%02x%02x%02x)\n",
726 rx->dev->name, MAC_ARG(hdr->addr2),
727 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
728 rpn[5], pn[0], pn[1], pn[2], pn[3],
729 pn[4], pn[5]);
571ecf67
JB		 730 return TXRX_DROP;
731 }
732 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
733 }
734
735 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
736 __skb_queue_tail(&entry->skb_list, rx->skb);
737 entry->last_frag = frag;
738 entry->extra_len += rx->skb->len;
739 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
740 rx->skb = NULL;
741 return TXRX_QUEUED;
742 }
743
744 rx->skb = __skb_dequeue(&entry->skb_list);
745 if (skb_tailroom(rx->skb) < entry->extra_len) {
746 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
747 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
748 GFP_ATOMIC))) {
749 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
750 __skb_queue_purge(&entry->skb_list);
751 return TXRX_DROP;
752 }
753 }
754 while ((skb = __skb_dequeue(&entry->skb_list))) {
755 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
756 dev_kfree_skb(skb);
757 }
758
759 /* Complete frame has been reassembled - process it now */
badffb72 760 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
571ecf67
JB		 761
762 out:
763 if (rx->sta)
764 rx->sta->rx_packets++;
765 if (is_multicast_ether_addr(hdr->addr1))
766 rx->local->dot11MulticastReceivedFrameCount++;
767 else
768 ieee80211_led_rx(rx->local);
769 return TXRX_CONTINUE;
770}
771
772static ieee80211_txrx_result
773ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
774{
775 struct sk_buff *skb;
776 int no_pending_pkts;
777
778 if (likely(!rx->sta ||
779 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
780 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
badffb72 781 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
571ecf67
JB		 782 return TXRX_CONTINUE;
783
784 skb = skb_dequeue(&rx->sta->tx_filtered);
785 if (!skb) {
786 skb = skb_dequeue(&rx->sta->ps_tx_buf);
787 if (skb)
788 rx->local->total_ps_buffered--;
789 }
790 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
791 skb_queue_empty(&rx->sta->ps_tx_buf);
792
793 if (skb) {
794 struct ieee80211_hdr *hdr =
795 (struct ieee80211_hdr *) skb->data;
796
797 /* tell TX path to send one frame even though the STA may
798 * still remain is PS mode after this frame exchange */
799 rx->sta->pspoll = 1;
800
801#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
802 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
803 "after %d)\n",
804 MAC_ARG(rx->sta->addr), rx->sta->aid,
805 skb_queue_len(&rx->sta->ps_tx_buf));
806#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
807
808 /* Use MoreData flag to indicate whether there are more
809 * buffered frames for this STA */
810 if (no_pending_pkts) {
811 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
812 rx->sta->flags &= ~WLAN_STA_TIM;
813 } else
814 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
815
816 dev_queue_xmit(skb);
817
818 if (no_pending_pkts) {
819 if (rx->local->ops->set_tim)
820 rx->local->ops->set_tim(local_to_hw(rx->local),
821 rx->sta->aid, 0);
822 if (rx->sdata->bss)
823 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
824 }
825#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
826 } else if (!rx->u.rx.sent_ps_buffered) {
827 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
828 "though there is no buffered frames for it\n",
829 rx->dev->name, MAC_ARG(rx->sta->addr));
830#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
831
832 }
833
834 /* Free PS Poll skb here instead of returning TXRX_DROP that would
835 * count as an dropped frame. */
836 dev_kfree_skb(rx->skb);
837
838 return TXRX_QUEUED;
839}
840
6e0d114d
JB		 841static ieee80211_txrx_result
842ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
843{
844 u16 fc = rx->fc;
845 u8 *data = rx->skb->data;
846 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
847
848 if (!WLAN_FC_IS_QOS_DATA(fc))
849 return TXRX_CONTINUE;
850
851 /* remove the qos control field, update frame type and meta-data */
852 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
853 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
854 /* change frame type to non QOS */
855 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
856 hdr->frame_control = cpu_to_le16(fc);
857
858 return TXRX_CONTINUE;
859}
860
571ecf67
JB		 861static ieee80211_txrx_result
862ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
863{
864 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
badffb72
JS		 865 rx->sdata->type != IEEE80211_IF_TYPE_STA &&
866 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
571ecf67
JB		 867 /* Pass both encrypted and unencrypted EAPOL frames to user
868 * space for processing. */
869 if (!rx->local->apdev)
870 return TXRX_DROP;
871 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
872 ieee80211_msg_normal);
873 return TXRX_QUEUED;
874 }
875
876 if (unlikely(rx->sdata->ieee802_1x &&
877 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
878 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
879 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
880 !ieee80211_is_eapol(rx->skb))) {
881#ifdef CONFIG_MAC80211_DEBUG
882 struct ieee80211_hdr *hdr =
883 (struct ieee80211_hdr *) rx->skb->data;
884 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
885 " (unauthorized port)\n", rx->dev->name,
886 MAC_ARG(hdr->addr2));
887#endif /* CONFIG_MAC80211_DEBUG */
888 return TXRX_DROP;
889 }
890
891 return TXRX_CONTINUE;
892}
893
894static ieee80211_txrx_result
895ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
896{
3017b80b 897 /*
7848ba7d
JB		 898 * Pass through unencrypted frames if the hardware has
899 * decrypted them already.
3017b80b 900 */
7848ba7d 901 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
571ecf67
JB		 902 return TXRX_CONTINUE;
903
904 /* Drop unencrypted frames if key is set. */
905 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
906 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
907 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
908 (rx->key || rx->sdata->drop_unencrypted) &&
909 (rx->sdata->eapol == 0 ||
910 !ieee80211_is_eapol(rx->skb)))) {
1a84f3fd
JB		 911 if (net_ratelimit())
912 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
913 "encryption\n", rx->dev->name);
571ecf67
JB		 914 return TXRX_DROP;
915 }
916 return TXRX_CONTINUE;
917}
918
919static ieee80211_txrx_result
920ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
921{
922 struct net_device *dev = rx->dev;
923 struct ieee80211_local *local = rx->local;
924 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
925 u16 fc, hdrlen, ethertype;
926 u8 *payload;
927 u8 dst[ETH_ALEN];
928 u8 src[ETH_ALEN];
929 struct sk_buff *skb = rx->skb, *skb2;
930 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
931
932 fc = rx->fc;
933 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
934 return TXRX_CONTINUE;
935
936 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
937 return TXRX_DROP;
938
939 hdrlen = ieee80211_get_hdrlen(fc);
940
941 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
942 * header
943 * IEEE 802.11 address fields:
944 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
945 * 0 0 DA SA BSSID n/a
946 * 0 1 DA BSSID SA n/a
947 * 1 0 BSSID SA DA n/a
948 * 1 1 RA TA DA SA
949 */
950
951 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
952 case IEEE80211_FCTL_TODS:
953 /* BSSID SA DA */
954 memcpy(dst, hdr->addr3, ETH_ALEN);
955 memcpy(src, hdr->addr2, ETH_ALEN);
956
957 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
958 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
1a84f3fd
JB		 959 if (net_ratelimit())
960 printk(KERN_DEBUG "%s: dropped ToDS frame "
961 "(BSSID=" MAC_FMT
962 " SA=" MAC_FMT
963 " DA=" MAC_FMT ")\n",
964 dev->name,
965 MAC_ARG(hdr->addr1),
966 MAC_ARG(hdr->addr2),
967 MAC_ARG(hdr->addr3));
571ecf67
JB		 968 return TXRX_DROP;
969 }
970 break;
971 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
972 /* RA TA DA SA */
973 memcpy(dst, hdr->addr3, ETH_ALEN);
974 memcpy(src, hdr->addr4, ETH_ALEN);
975
976 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
1a84f3fd
JB		 977 if (net_ratelimit())
978 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
979 "frame (RA=" MAC_FMT
980 " TA=" MAC_FMT " DA=" MAC_FMT
981 " SA=" MAC_FMT ")\n",
982 rx->dev->name,
983 MAC_ARG(hdr->addr1),
984 MAC_ARG(hdr->addr2),
985 MAC_ARG(hdr->addr3),
986 MAC_ARG(hdr->addr4));
571ecf67
JB		 987 return TXRX_DROP;
988 }
989 break;
990 case IEEE80211_FCTL_FROMDS:
991 /* DA BSSID SA */
992 memcpy(dst, hdr->addr1, ETH_ALEN);
993 memcpy(src, hdr->addr3, ETH_ALEN);
994
b3316157
JL		 995 if (sdata->type != IEEE80211_IF_TYPE_STA ||
996 (is_multicast_ether_addr(dst) &&
997 !compare_ether_addr(src, dev->dev_addr)))
571ecf67 998 return TXRX_DROP;
571ecf67
JB		 999 break;
1000 case 0:
1001 /* DA SA BSSID */
1002 memcpy(dst, hdr->addr1, ETH_ALEN);
1003 memcpy(src, hdr->addr2, ETH_ALEN);
1004
1005 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1006 if (net_ratelimit()) {
1007 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
1008 MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
1009 ")\n",
1010 dev->name, MAC_ARG(hdr->addr1),
1011 MAC_ARG(hdr->addr2),
1012 MAC_ARG(hdr->addr3));
1013 }
1014 return TXRX_DROP;
1015 }
1016 break;
1017 }
1018
1019 payload = skb->data + hdrlen;
1020
1021 if (unlikely(skb->len - hdrlen < 8)) {
1022 if (net_ratelimit()) {
1023 printk(KERN_DEBUG "%s: RX too short data frame "
1024 "payload\n", dev->name);
1025 }
1026 return TXRX_DROP;
1027 }
1028
1029 ethertype = (payload[6] << 8) | payload[7];
1030
1031 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1032 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1033 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1034 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1035 * replace EtherType */
1036 skb_pull(skb, hdrlen + 6);
1037 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1038 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1039 } else {
1040 struct ethhdr *ehdr;
1041 __be16 len;
1042 skb_pull(skb, hdrlen);
1043 len = htons(skb->len);
1044 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1045 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1046 memcpy(ehdr->h_source, src, ETH_ALEN);
1047 ehdr->h_proto = len;
1048 }
1049 skb->dev = dev;
1050
1051 skb2 = NULL;
1052
68aae116
SH		 1053 dev->stats.rx_packets++;
1054 dev->stats.rx_bytes += skb->len;
571ecf67
JB		 1055
1056 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
badffb72
JS		 1057 || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1058 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
571ecf67
JB		 1059 if (is_multicast_ether_addr(skb->data)) {
1060 /* send multicast frames both to higher layers in
1061 * local net stack and back to the wireless media */
1062 skb2 = skb_copy(skb, GFP_ATOMIC);
1a84f3fd 1063 if (!skb2 && net_ratelimit())
571ecf67
JB		 1064 printk(KERN_DEBUG "%s: failed to clone "
1065 "multicast frame\n", dev->name);
1066 } else {
1067 struct sta_info *dsta;
1068 dsta = sta_info_get(local, skb->data);
1069 if (dsta && !dsta->dev) {
1a84f3fd
JB		 1070 if (net_ratelimit())
1071 printk(KERN_DEBUG "Station with null "
1072 "dev structure!\n");
571ecf67
JB		 1073 } else if (dsta && dsta->dev == dev) {
1074 /* Destination station is associated to this
1075 * AP, so send the frame directly to it and
1076 * do not pass the frame to local net stack.
1077 */
1078 skb2 = skb;
1079 skb = NULL;
1080 }
1081 if (dsta)
1082 sta_info_put(dsta);
1083 }
1084 }
1085
1086 if (skb) {
1087 /* deliver to local stack */
1088 skb->protocol = eth_type_trans(skb, dev);
1089 memset(skb->cb, 0, sizeof(skb->cb));
1090 netif_rx(skb);
1091 }
1092
1093 if (skb2) {
1094 /* send to wireless media */
1095 skb2->protocol = __constant_htons(ETH_P_802_3);
1096 skb_set_network_header(skb2, 0);
1097 skb_set_mac_header(skb2, 0);
1098 dev_queue_xmit(skb2);
1099 }
1100
1101 return TXRX_QUEUED;
1102}
1103
1104static ieee80211_txrx_result
1105ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1106{
1107 struct ieee80211_sub_if_data *sdata;
1108
badffb72 1109 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
571ecf67
JB		 1110 return TXRX_DROP;
1111
1112 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1113 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1114 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1115 !rx->local->user_space_mlme) {
1116 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1117 } else {
1118 /* Management frames are sent to hostapd for processing */
1119 if (!rx->local->apdev)
1120 return TXRX_DROP;
1121 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1122 ieee80211_msg_normal);
1123 }
1124 return TXRX_QUEUED;
1125}
1126
1127static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1128 struct ieee80211_local *local,
1129 ieee80211_rx_handler *handlers,
1130 struct ieee80211_txrx_data *rx,
1131 struct sta_info *sta)
1132{
1133 ieee80211_rx_handler *handler;
1134 ieee80211_txrx_result res = TXRX_DROP;
1135
1136 for (handler = handlers; *handler != NULL; handler++) {
1137 res = (*handler)(rx);
8e6f0032
JB		 1138
1139 switch (res) {
1140 case TXRX_CONTINUE:
1141 continue;
1142 case TXRX_DROP:
1143 I802_DEBUG_INC(local->rx_handlers_drop);
1144 if (sta)
1145 sta->rx_dropped++;
1146 break;
1147 case TXRX_QUEUED:
1148 I802_DEBUG_INC(local->rx_handlers_queued);
571ecf67
JB		 1149 break;
1150 }
8e6f0032 1151 break;
571ecf67
JB		 1152 }
1153
8e6f0032 1154 if (res == TXRX_DROP)
571ecf67 1155 dev_kfree_skb(rx->skb);
571ecf67
JB		 1156 return res;
1157}
1158
1159static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1160 ieee80211_rx_handler *handlers,
1161 struct ieee80211_txrx_data *rx,
1162 struct sta_info *sta)
1163{
1164 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1165 TXRX_CONTINUE)
1166 dev_kfree_skb(rx->skb);
1167}
1168
1169static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1170 struct ieee80211_hdr *hdr,
1171 struct sta_info *sta,
1172 struct ieee80211_txrx_data *rx)
1173{
1174 int keyidx, hdrlen;
1175
1176 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1177 if (rx->skb->len >= hdrlen + 4)
1178 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1179 else
1180 keyidx = -1;
1181
1182 /* TODO: verify that this is not triggered by fragmented
1183 * frames (hw does not verify MIC for them). */
1a84f3fd
JB		 1184 if (net_ratelimit())
1185 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1186 "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
1187 dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1),
1188 keyidx);
571ecf67
JB		 1189
1190 if (!sta) {
1191 /* Some hardware versions seem to generate incorrect
1192 * Michael MIC reports; ignore them to avoid triggering
1193 * countermeasures. */
1a84f3fd
JB		 1194 if (net_ratelimit())
1195 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1196 "error for unknown address " MAC_FMT "\n",
1197 dev->name, MAC_ARG(hdr->addr2));
571ecf67
JB		 1198 goto ignore;
1199 }
1200
1201 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1a84f3fd
JB		 1202 if (net_ratelimit())
1203 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1204 "error for a frame with no ISWEP flag (src "
1205 MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
571ecf67
JB		 1206 goto ignore;
1207 }
1208
7848ba7d 1209 if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
571ecf67
JB		 1210 /* AP with Pairwise keys support should never receive Michael
1211 * MIC errors for non-zero keyidx because these are reserved
1212 * for group keys and only the AP is sending real multicast
1213 * frames in BSS. */
eb063c17
JB		 1214 if (net_ratelimit())
1215 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1216 "a frame with non-zero keyidx (%d)"
1217 " (src " MAC_FMT ")\n", dev->name, keyidx,
1218 MAC_ARG(hdr->addr2));
1219 goto ignore;
571ecf67
JB		 1220 }
1221
1222 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1223 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1224 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1a84f3fd
JB		 1225 if (net_ratelimit())
1226 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1227 "error for a frame that cannot be encrypted "
1228 "(fc=0x%04x) (src " MAC_FMT ")\n",
1229 dev->name, rx->fc, MAC_ARG(hdr->addr2));
571ecf67
JB		 1230 goto ignore;
1231 }
1232
571ecf67
JB		 1233 /* TODO: consider verifying the MIC error report with software
1234 * implementation if we get too many spurious reports from the
1235 * hardware. */
571ecf67 1236
eb063c17 1237 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
571ecf67
JB		 1238 ignore:
1239 dev_kfree_skb(rx->skb);
1240 rx->skb = NULL;
1241}
1242
1243ieee80211_rx_handler ieee80211_rx_handlers[] =
1244{
1245 ieee80211_rx_h_if_stats,
1246 ieee80211_rx_h_monitor,
1247 ieee80211_rx_h_passive_scan,
1248 ieee80211_rx_h_check,
570bd537 1249 ieee80211_rx_h_load_key,
571ecf67
JB		 1250 ieee80211_rx_h_sta_process,
1251 ieee80211_rx_h_ccmp_decrypt,
1252 ieee80211_rx_h_tkip_decrypt,
1253 ieee80211_rx_h_wep_weak_iv_detection,
1254 ieee80211_rx_h_wep_decrypt,
1255 ieee80211_rx_h_defragment,
1256 ieee80211_rx_h_ps_poll,
1257 ieee80211_rx_h_michael_mic_verify,
1258 /* this must be after decryption - so header is counted in MPDU mic
1259 * must be before pae and data, so QOS_DATA format frames
1260 * are not passed to user space by these functions
1261 */
1262 ieee80211_rx_h_remove_qos_control,
1263 ieee80211_rx_h_802_1x_pae,
1264 ieee80211_rx_h_drop_unencrypted,
1265 ieee80211_rx_h_data,
1266 ieee80211_rx_h_mgmt,
1267 NULL
1268};
1269
1270/* main receive path */
1271
23a24def
JB		 1272static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1273 u8 *bssid, struct ieee80211_txrx_data *rx,
1274 struct ieee80211_hdr *hdr)
1275{
1276 int multicast = is_multicast_ether_addr(hdr->addr1);
1277
1278 switch (sdata->type) {
1279 case IEEE80211_IF_TYPE_STA:
1280 if (!bssid)
1281 return 0;
1282 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
badffb72 1283 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def 1284 return 0;
badffb72 1285 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB		 1286 } else if (!multicast &&
1287 compare_ether_addr(sdata->dev->dev_addr,
1288 hdr->addr1) != 0) {
13262ffd 1289 if (!(sdata->flags & IEEE80211_SDATA_PROMISC))
23a24def 1290 return 0;
badffb72 1291 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB		 1292 }
1293 break;
1294 case IEEE80211_IF_TYPE_IBSS:
1295 if (!bssid)
1296 return 0;
1297 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
badffb72 1298 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def 1299 return 0;
badffb72 1300 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB		 1301 } else if (!multicast &&
1302 compare_ether_addr(sdata->dev->dev_addr,
1303 hdr->addr1) != 0) {
13262ffd 1304 if (!(sdata->flags & IEEE80211_SDATA_PROMISC))
23a24def 1305 return 0;
badffb72 1306 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def
JB		 1307 } else if (!rx->sta)
1308 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1309 bssid, hdr->addr2);
1310 break;
1311 case IEEE80211_IF_TYPE_AP:
1312 if (!bssid) {
1313 if (compare_ether_addr(sdata->dev->dev_addr,
1314 hdr->addr1))
1315 return 0;
1316 } else if (!ieee80211_bssid_match(bssid,
1317 sdata->dev->dev_addr)) {
badffb72 1318 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def 1319 return 0;
badffb72 1320 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
23a24def 1321 }
badffb72
JS		 1322 if (sdata->dev == sdata->local->mdev &&
1323 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
23a24def
JB		 1324 /* do not receive anything via
1325 * master device when not scanning */
1326 return 0;
1327 break;
1328 case IEEE80211_IF_TYPE_WDS:
1329 if (bssid ||
1330 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1331 return 0;
1332 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1333 return 0;
1334 break;
1335 }
1336
1337 return 1;
1338}
1339
571ecf67
JB		 1340/*
1341 * This is the receive path handler. It is called by a low level driver when an
1342 * 802.11 MPDU is received from the hardware.
1343 */
1344void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1345 struct ieee80211_rx_status *status)
1346{
1347 struct ieee80211_local *local = hw_to_local(hw);
1348 struct ieee80211_sub_if_data *sdata;
1349 struct sta_info *sta;
1350 struct ieee80211_hdr *hdr;
1351 struct ieee80211_txrx_data rx;
1352 u16 type;
23a24def 1353 int radiotap_len = 0, prepres;
8e6f0032
JB		 1354 struct ieee80211_sub_if_data *prev = NULL;
1355 struct sk_buff *skb_new;
1356 u8 *bssid;
571ecf67
JB		 1357
1358 if (status->flag & RX_FLAG_RADIOTAP) {
1359 radiotap_len = ieee80211_get_radiotap_len(skb->data);
1360 skb_pull(skb, radiotap_len);
1361 }
1362
d4e46a3d
JB		 1363 /*
1364 * key references are protected using RCU and this requires that
1365 * we are in a read-site RCU section during receive processing
1366 */
1367 rcu_read_lock();
1368
571ecf67
JB		 1369 hdr = (struct ieee80211_hdr *) skb->data;
1370 memset(&rx, 0, sizeof(rx));
1371 rx.skb = skb;
1372 rx.local = local;
1373
1374 rx.u.rx.status = status;
1375 rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
1376 type = rx.fc & IEEE80211_FCTL_FTYPE;
1377 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1378 local->dot11ReceivedFragmentCount++;
571ecf67 1379
23a24def 1380 if (skb->len >= 16) {
571ecf67 1381 sta = rx.sta = sta_info_get(local, hdr->addr2);
23a24def
JB		 1382 if (sta) {
1383 rx.dev = rx.sta->dev;
1384 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1385 }
1386 } else
571ecf67
JB		 1387 sta = rx.sta = NULL;
1388
571ecf67
JB		 1389 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1390 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1391 goto end;
1392 }
1393
1394 if (unlikely(local->sta_scanning))
badffb72 1395 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
571ecf67
JB		 1396
1397 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1398 sta) != TXRX_CONTINUE)
1399 goto end;
1400 skb = rx.skb;
1401
1402 skb_push(skb, radiotap_len);
c9ee23df 1403 if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
23a24def 1404 !local->iff_promiscs && !is_multicast_ether_addr(hdr->addr1)) {
badffb72 1405 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
571ecf67 1406 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
23a24def 1407 rx.sta);
8e6f0032 1408 sta_info_put(sta);
d4e46a3d 1409 rcu_read_unlock();
8e6f0032
JB		 1410 return;
1411 }
1412
1413 bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
1414
1415 read_lock(&local->sub_if_lock);
1416 list_for_each_entry(sdata, &local->sub_if_list, list) {
badffb72 1417 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
23a24def 1418
2a8a9a88
JB		 1419 if (!netif_running(sdata->dev))
1420 continue;
1421
23a24def
JB		 1422 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1423 /* prepare_for_handlers can change sta */
1424 sta = rx.sta;
1425
1426 if (!prepres)
1427 continue;
8e6f0032 1428
340e11f3
JB		 1429 /*
1430 * frame is destined for this interface, but if it's not
1431 * also for the previous one we handle that after the
1432 * loop to avoid copying the SKB once too much
1433 */
1434
1435 if (!prev) {
1436 prev = sdata;
1437 continue;
8e6f0032 1438 }
340e11f3
JB		 1439
1440 /*
1441 * frame was destined for the previous interface
1442 * so invoke RX handlers for it
1443 */
1444
1445 skb_new = skb_copy(skb, GFP_ATOMIC);
1446 if (!skb_new) {
1447 if (net_ratelimit())
1448 printk(KERN_DEBUG "%s: failed to copy "
1449 "multicast frame for %s",
1450 local->mdev->name, prev->dev->name);
1451 continue;
1452 }
1453 rx.skb = skb_new;
1454 rx.dev = prev->dev;
1455 rx.sdata = prev;
1456 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1457 &rx, sta);
8e6f0032 1458 prev = sdata;
571ecf67 1459 }
8e6f0032
JB		 1460 if (prev) {
1461 rx.skb = skb;
1462 rx.dev = prev->dev;
1463 rx.sdata = prev;
1464 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1465 &rx, sta);
1466 } else
1467 dev_kfree_skb(skb);
1468 read_unlock(&local->sub_if_lock);
571ecf67 1469
8e6f0032 1470 end:
d4e46a3d
JB		 1471 rcu_read_unlock();
1472
571ecf67
JB		 1473 if (sta)
1474 sta_info_put(sta);
1475}
1476EXPORT_SYMBOL(__ieee80211_rx);
1477
1478/* This is a version of the rx handler that can be called from hard irq
1479 * context. Post the skb on the queue and schedule the tasklet */
1480void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1481 struct ieee80211_rx_status *status)
1482{
1483 struct ieee80211_local *local = hw_to_local(hw);
1484
1485 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1486
1487 skb->dev = local->mdev;
1488 /* copy status into skb->cb for use by tasklet */
1489 memcpy(skb->cb, status, sizeof(*status));
1490 skb->pkt_type = IEEE80211_RX_MSG;
1491 skb_queue_tail(&local->skb_queue, skb);
1492 tasklet_schedule(&local->tasklet);
1493}
1494EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux kernel - Deliverables
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