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>
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.
12 #include <linux/kernel.h>
13 #include <linux/skbuff.h>
14 #include <linux/netdevice.h>
15 #include <linux/etherdevice.h>
16 #include <linux/rcupdate.h>
17 #include <net/mac80211.h>
18 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "ieee80211_led.h"
22 #include "ieee80211_common.h"
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.
35 static ieee80211_txrx_result
36 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
38 u8 *data = rx->skb->data;
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;
47 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
48 /* Separate TID for management frames */
49 tid = NUM_RX_DATA_QUEUES - 1;
51 /* no qos control present */
52 tid = 0; /* 802.1d - Best Effort */
56 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
57 /* only a debug counter, sta might not be assigned properly yet */
59 I802_DEBUG_INC(rx->sta->wme_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;
69 static ieee80211_txrx_result
70 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
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;
80 /* Estimate total channel use caused by this frame */
82 if (unlikely(mode->num_rates < 0))
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];
93 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
94 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
96 if (mode->mode == MODE_IEEE80211A ||
97 (mode->mode == MODE_IEEE80211G &&
98 rate->flags & IEEE80211_RATE_ERP))
99 hdrtime = CHAN_UTIL_HDR_SHORT;
101 hdrtime = CHAN_UTIL_HDR_LONG;
104 if (!is_multicast_ether_addr(hdr->addr1))
107 load += skb->len * rate->rate_inv;
109 /* Divide channel_use by 8 to avoid wrapping around the counter */
110 load >>= CHAN_UTIL_SHIFT;
111 local->channel_use_raw += load;
112 rx->u.rx.load = load;
114 return TXRX_CONTINUE;
117 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
119 ieee80211_rx_h_parse_qos,
120 ieee80211_rx_h_load_stats,
126 static ieee80211_txrx_result
127 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
130 rx->sta->channel_use_raw += rx->u.rx.load;
131 rx->sdata->channel_use_raw += rx->u.rx.load;
132 return TXRX_CONTINUE;
136 ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
137 struct ieee80211_rx_status *status)
139 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
140 struct ieee80211_rate *rate;
141 struct ieee80211_rtap_hdr {
142 struct ieee80211_radiotap_header hdr;
148 } __attribute__ ((packed)) *rthdr;
152 if (status->flag & RX_FLAG_RADIOTAP)
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)) {
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);
175 rthdr->rate = rate->rate / 5;
176 rthdr->chan_freq = cpu_to_le16(status->freq);
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;
184 dev->stats.rx_packets++;
185 dev->stats.rx_bytes += skb->len;
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));
195 static ieee80211_txrx_result
196 ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
198 if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
199 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
203 if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
204 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data));
206 return TXRX_CONTINUE;
209 static ieee80211_txrx_result
210 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
212 struct ieee80211_local *local = rx->local;
213 struct sk_buff *skb = rx->skb;
215 if (unlikely(local->sta_scanning != 0)) {
216 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
220 if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
221 /* scanning finished during invoking of handlers */
222 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
226 return TXRX_CONTINUE;
229 static ieee80211_txrx_result
230 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
232 struct ieee80211_hdr *hdr;
233 hdr = (struct ieee80211_hdr *) rx->skb->data;
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] ==
240 if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
241 rx->local->dot11FrameDuplicateCount++;
242 rx->sta->num_duplicates++;
246 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
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);
253 if (unlikely(rx->skb->len < 16)) {
254 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
258 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
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;
266 rx->skb->pkt_type = PACKET_MULTICAST;
268 rx->skb->pkt_type = PACKET_OTHERHOST;
270 /* Drop disallowed frame classes based on STA auth/assoc state;
271 * IEEE 802.11, Chap 5.5.
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.
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)
286 || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
287 /* Drop IBSS frames and frames for other hosts
292 if (!rx->local->apdev)
295 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
296 ieee80211_msg_sta_not_assoc);
300 return TXRX_CONTINUE;
304 static ieee80211_txrx_result
305 ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
307 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
310 struct ieee80211_key *stakey = NULL;
315 * There are three types of keys:
317 * - PTK (pairwise keys)
318 * - STK (station-to-station pairwise keys)
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.
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.
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.
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
338 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
339 return TXRX_CONTINUE;
342 * No point in finding a key if the frame is neither
343 * addressed to us nor a multicast frame.
345 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
346 return TXRX_CONTINUE;
349 stakey = rcu_dereference(rx->sta->key);
351 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
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?
363 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
364 (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
365 return TXRX_CONTINUE;
367 hdrlen = ieee80211_get_hdrlen(rx->fc);
369 if (rx->skb->len < 8 + hdrlen)
370 return TXRX_DROP; /* TODO: count this? */
373 * no need to call ieee80211_wep_get_keyidx,
374 * it verifies a bunch of things we've done already
376 keyidx = rx->skb->data[hdrlen + 3] >> 6;
378 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
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.
385 if (rx->key && rx->key->conf.alg != ALG_WEP &&
386 !is_multicast_ether_addr(hdr->addr1))
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,
400 return TXRX_CONTINUE;
403 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
405 struct ieee80211_sub_if_data *sdata;
406 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
409 atomic_inc(&sdata->bss->num_sta_ps);
410 sta->flags |= WLAN_STA_PS;
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 */
418 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
420 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
423 struct ieee80211_sub_if_data *sdata;
424 struct ieee80211_tx_packet_data *pkt_data;
426 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
428 atomic_dec(&sdata->bss->num_sta_ps);
429 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
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);
435 bss_tim_clear(local, sdata->bss, sta->aid);
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;
445 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
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--;
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 */
457 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
464 static ieee80211_txrx_result
465 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
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;
472 return TXRX_CONTINUE;
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;
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.
488 sta->last_rx = jiffies;
491 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
492 return TXRX_CONTINUE;
495 sta->rx_bytes += rx->skb->len;
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;
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);
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. */
518 dev_kfree_skb(rx->skb);
522 return TXRX_CONTINUE;
523 } /* ieee80211_rx_h_sta_process */
525 static ieee80211_txrx_result
526 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
528 if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
529 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
530 !rx->key || rx->key->conf.alg != ALG_WEP ||
531 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
532 return TXRX_CONTINUE;
534 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
535 if (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
536 !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED))
537 if (ieee80211_wep_is_weak_iv(rx->skb, rx->key))
538 rx->sta->wep_weak_iv_count++;
540 return TXRX_CONTINUE;
543 static ieee80211_txrx_result
544 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
546 if ((rx->key && rx->key->conf.alg != ALG_WEP) ||
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;
555 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
560 if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) {
561 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
563 printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
564 "failed\n", rx->dev->name);
567 } else if (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED)) {
568 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
570 skb_trim(rx->skb, rx->skb->len - 4);
573 return TXRX_CONTINUE;
576 static inline struct ieee80211_fragment_entry *
577 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
578 unsigned int frag, unsigned int seq, int rx_queue,
579 struct sk_buff **skb)
581 struct ieee80211_fragment_entry *entry;
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;
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);
604 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
606 entry->first_frag_time = jiffies;
608 entry->rx_queue = rx_queue;
609 entry->last_frag = frag;
611 entry->extra_len = 0;
616 static inline struct ieee80211_fragment_entry *
617 ieee80211_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)
621 struct ieee80211_fragment_entry *entry;
624 idx = sdata->fragment_next;
625 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
626 struct ieee80211_hdr *f_hdr;
631 idx = IEEE80211_FRAGMENT_MAX - 1;
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)
639 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
640 f_fc = le16_to_cpu(f_hdr->frame_control);
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)
647 if (entry->first_frag_time + 2 * HZ < jiffies) {
648 __skb_queue_purge(&entry->skb_list);
657 static ieee80211_txrx_result
658 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
660 struct ieee80211_hdr *hdr;
662 unsigned int frag, seq;
663 struct ieee80211_fragment_entry *entry;
666 hdr = (struct ieee80211_hdr *) rx->skb->data;
667 sc = le16_to_cpu(hdr->seq_ctrl);
668 frag = sc & IEEE80211_SCTL_FRAG;
670 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
671 (rx->skb)->len < 24 ||
672 is_multicast_ether_addr(hdr->addr1))) {
676 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
678 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
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));
684 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
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. */
689 memcpy(entry->last_pn,
690 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
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.
699 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
700 rx->u.rx.queue, hdr);
702 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
706 /* Verify that MPDUs within one MSDU have sequential PN values.
707 * (IEEE 802.11i, 8.3.3.4.5) */
710 u8 pn[CCMP_PN_LEN], *rpn;
711 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
713 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
714 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
719 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
720 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
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],
732 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
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) {
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,
749 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
750 __skb_queue_purge(&entry->skb_list);
754 while ((skb = __skb_dequeue(&entry->skb_list))) {
755 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
759 /* Complete frame has been reassembled - process it now */
760 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
764 rx->sta->rx_packets++;
765 if (is_multicast_ether_addr(hdr->addr1))
766 rx->local->dot11MulticastReceivedFrameCount++;
768 ieee80211_led_rx(rx->local);
769 return TXRX_CONTINUE;
772 static ieee80211_txrx_result
773 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
778 if (likely(!rx->sta ||
779 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
780 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
781 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
782 return TXRX_CONTINUE;
784 skb = skb_dequeue(&rx->sta->tx_filtered);
786 skb = skb_dequeue(&rx->sta->ps_tx_buf);
788 rx->local->total_ps_buffered--;
790 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
791 skb_queue_empty(&rx->sta->ps_tx_buf);
794 struct ieee80211_hdr *hdr =
795 (struct ieee80211_hdr *) skb->data;
797 /* tell TX path to send one frame even though the STA may
798 * still remain is PS mode after this frame exchange */
801 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
802 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
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 */
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;
814 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
818 if (no_pending_pkts) {
819 if (rx->local->ops->set_tim)
820 rx->local->ops->set_tim(local_to_hw(rx->local),
823 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
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 */
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);
841 static ieee80211_txrx_result
842 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
845 u8 *data = rx->skb->data;
846 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
848 if (!WLAN_FC_IS_QOS_DATA(fc))
849 return TXRX_CONTINUE;
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);
858 return TXRX_CONTINUE;
861 static ieee80211_txrx_result
862 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
864 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
865 rx->sdata->type != IEEE80211_IF_TYPE_STA &&
866 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
867 /* Pass both encrypted and unencrypted EAPOL frames to user
868 * space for processing. */
869 if (!rx->local->apdev)
871 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
872 ieee80211_msg_normal);
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 */
891 return TXRX_CONTINUE;
894 static ieee80211_txrx_result
895 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
898 * Pass through unencrypted frames if the hardware has
899 * decrypted them already.
901 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
902 return TXRX_CONTINUE;
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)))) {
912 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
913 "encryption\n", rx->dev->name);
916 return TXRX_CONTINUE;
919 static ieee80211_txrx_result
920 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
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;
929 struct sk_buff *skb = rx->skb, *skb2;
930 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
933 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
934 return TXRX_CONTINUE;
936 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
939 hdrlen = ieee80211_get_hdrlen(fc);
941 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
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
951 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
952 case IEEE80211_FCTL_TODS:
954 memcpy(dst, hdr->addr3, ETH_ALEN);
955 memcpy(src, hdr->addr2, ETH_ALEN);
957 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
958 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
960 printk(KERN_DEBUG "%s: dropped ToDS frame "
963 " DA=" MAC_FMT ")\n",
967 MAC_ARG(hdr->addr3));
971 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
973 memcpy(dst, hdr->addr3, ETH_ALEN);
974 memcpy(src, hdr->addr4, ETH_ALEN);
976 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
978 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
980 " TA=" MAC_FMT " DA=" MAC_FMT
981 " SA=" MAC_FMT ")\n",
986 MAC_ARG(hdr->addr4));
990 case IEEE80211_FCTL_FROMDS:
992 memcpy(dst, hdr->addr1, ETH_ALEN);
993 memcpy(src, hdr->addr3, ETH_ALEN);
995 if (sdata->type != IEEE80211_IF_TYPE_STA ||
996 (is_multicast_ether_addr(dst) &&
997 !compare_ether_addr(src, dev->dev_addr)))
1002 memcpy(dst, hdr->addr1, ETH_ALEN);
1003 memcpy(src, hdr->addr2, ETH_ALEN);
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
1010 dev->name, MAC_ARG(hdr->addr1),
1011 MAC_ARG(hdr->addr2),
1012 MAC_ARG(hdr->addr3));
1019 payload = skb->data + hdrlen;
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);
1029 ethertype = (payload[6] << 8) | payload[7];
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);
1040 struct ethhdr *ehdr;
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;
1053 dev->stats.rx_packets++;
1054 dev->stats.rx_bytes += skb->len;
1056 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1057 || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1058 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
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);
1063 if (!skb2 && net_ratelimit())
1064 printk(KERN_DEBUG "%s: failed to clone "
1065 "multicast frame\n", dev->name);
1067 struct sta_info *dsta;
1068 dsta = sta_info_get(local, skb->data);
1069 if (dsta && !dsta->dev) {
1070 if (net_ratelimit())
1071 printk(KERN_DEBUG "Station with null "
1072 "dev structure!\n");
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.
1087 /* deliver to local stack */
1088 skb->protocol = eth_type_trans(skb, dev);
1089 memset(skb->cb, 0, sizeof(skb->cb));
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);
1104 static ieee80211_txrx_result
1105 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1107 struct ieee80211_sub_if_data *sdata;
1109 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
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);
1118 /* Management frames are sent to hostapd for processing */
1119 if (!rx->local->apdev)
1121 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1122 ieee80211_msg_normal);
1127 static 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)
1133 ieee80211_rx_handler *handler;
1134 ieee80211_txrx_result res = TXRX_DROP;
1136 for (handler = handlers; *handler != NULL; handler++) {
1137 res = (*handler)(rx);
1143 I802_DEBUG_INC(local->rx_handlers_drop);
1148 I802_DEBUG_INC(local->rx_handlers_queued);
1154 if (res == TXRX_DROP)
1155 dev_kfree_skb(rx->skb);
1159 static 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)
1164 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1166 dev_kfree_skb(rx->skb);
1169 static 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)
1176 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1177 if (rx->skb->len >= hdrlen + 4)
1178 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1182 if (net_ratelimit())
1183 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1184 "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
1185 dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1),
1190 * Some hardware seem to generate incorrect Michael MIC
1191 * reports; ignore them to avoid triggering countermeasures.
1193 if (net_ratelimit())
1194 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1195 "error for unknown address " MAC_FMT "\n",
1196 dev->name, MAC_ARG(hdr->addr2));
1200 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1201 if (net_ratelimit())
1202 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1203 "error for a frame with no PROTECTED flag (src "
1204 MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
1208 if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
1210 * APs with pairwise keys should never receive Michael MIC
1211 * errors for non-zero keyidx because these are reserved for
1212 * group keys and only the AP is sending real multicast
1213 * frames in the BSS.
1215 if (net_ratelimit())
1216 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1217 "a frame with non-zero keyidx (%d)"
1218 " (src " MAC_FMT ")\n", dev->name, keyidx,
1219 MAC_ARG(hdr->addr2));
1223 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1224 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1225 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1226 if (net_ratelimit())
1227 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1228 "error for a frame that cannot be encrypted "
1229 "(fc=0x%04x) (src " MAC_FMT ")\n",
1230 dev->name, rx->fc, MAC_ARG(hdr->addr2));
1234 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1236 dev_kfree_skb(rx->skb);
1240 ieee80211_rx_handler ieee80211_rx_handlers[] =
1242 ieee80211_rx_h_if_stats,
1243 ieee80211_rx_h_monitor,
1244 ieee80211_rx_h_passive_scan,
1245 ieee80211_rx_h_check,
1246 ieee80211_rx_h_load_key,
1247 ieee80211_rx_h_sta_process,
1248 ieee80211_rx_h_ccmp_decrypt,
1249 ieee80211_rx_h_tkip_decrypt,
1250 ieee80211_rx_h_wep_weak_iv_detection,
1251 ieee80211_rx_h_wep_decrypt,
1252 ieee80211_rx_h_defragment,
1253 ieee80211_rx_h_ps_poll,
1254 ieee80211_rx_h_michael_mic_verify,
1255 /* this must be after decryption - so header is counted in MPDU mic
1256 * must be before pae and data, so QOS_DATA format frames
1257 * are not passed to user space by these functions
1259 ieee80211_rx_h_remove_qos_control,
1260 ieee80211_rx_h_802_1x_pae,
1261 ieee80211_rx_h_drop_unencrypted,
1262 ieee80211_rx_h_data,
1263 ieee80211_rx_h_mgmt,
1267 /* main receive path */
1269 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1270 u8 *bssid, struct ieee80211_txrx_data *rx,
1271 struct ieee80211_hdr *hdr)
1273 int multicast = is_multicast_ether_addr(hdr->addr1);
1275 switch (sdata->type) {
1276 case IEEE80211_IF_TYPE_STA:
1279 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1280 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1282 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1283 } else if (!multicast &&
1284 compare_ether_addr(sdata->dev->dev_addr,
1286 if (!(sdata->flags & IEEE80211_SDATA_PROMISC))
1288 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1291 case IEEE80211_IF_TYPE_IBSS:
1294 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1295 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1297 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1298 } else if (!multicast &&
1299 compare_ether_addr(sdata->dev->dev_addr,
1301 if (!(sdata->flags & IEEE80211_SDATA_PROMISC))
1303 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1304 } else if (!rx->sta)
1305 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1308 case IEEE80211_IF_TYPE_AP:
1310 if (compare_ether_addr(sdata->dev->dev_addr,
1313 } else if (!ieee80211_bssid_match(bssid,
1314 sdata->dev->dev_addr)) {
1315 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1317 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1319 if (sdata->dev == sdata->local->mdev &&
1320 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1321 /* do not receive anything via
1322 * master device when not scanning */
1325 case IEEE80211_IF_TYPE_WDS:
1327 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1329 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
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.
1341 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1342 struct ieee80211_rx_status *status)
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;
1350 int radiotap_len = 0, prepres;
1351 struct ieee80211_sub_if_data *prev = NULL;
1352 struct sk_buff *skb_new;
1355 if (status->flag & RX_FLAG_RADIOTAP) {
1356 radiotap_len = ieee80211_get_radiotap_len(skb->data);
1357 skb_pull(skb, radiotap_len);
1361 * key references are protected using RCU and this requires that
1362 * we are in a read-site RCU section during receive processing
1366 hdr = (struct ieee80211_hdr *) skb->data;
1367 memset(&rx, 0, sizeof(rx));
1371 rx.u.rx.status = status;
1372 rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
1373 type = rx.fc & IEEE80211_FCTL_FTYPE;
1374 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1375 local->dot11ReceivedFragmentCount++;
1377 if (skb->len >= 16) {
1378 sta = rx.sta = sta_info_get(local, hdr->addr2);
1380 rx.dev = rx.sta->dev;
1381 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1384 sta = rx.sta = NULL;
1386 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1387 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1391 if (unlikely(local->sta_scanning))
1392 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1394 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1395 sta) != TXRX_CONTINUE)
1399 skb_push(skb, radiotap_len);
1400 if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
1401 !local->iff_promiscs && !is_multicast_ether_addr(hdr->addr1)) {
1402 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1403 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1410 bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
1412 read_lock(&local->sub_if_lock);
1413 list_for_each_entry(sdata, &local->sub_if_list, list) {
1414 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1416 if (!netif_running(sdata->dev))
1419 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1420 /* prepare_for_handlers can change sta */
1427 * frame is destined for this interface, but if it's not
1428 * also for the previous one we handle that after the
1429 * loop to avoid copying the SKB once too much
1438 * frame was destined for the previous interface
1439 * so invoke RX handlers for it
1442 skb_new = skb_copy(skb, GFP_ATOMIC);
1444 if (net_ratelimit())
1445 printk(KERN_DEBUG "%s: failed to copy "
1446 "multicast frame for %s",
1447 local->mdev->name, prev->dev->name);
1453 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1461 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1465 read_unlock(&local->sub_if_lock);
1473 EXPORT_SYMBOL(__ieee80211_rx);
1475 /* This is a version of the rx handler that can be called from hard irq
1476 * context. Post the skb on the queue and schedule the tasklet */
1477 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1478 struct ieee80211_rx_status *status)
1480 struct ieee80211_local *local = hw_to_local(hw);
1482 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1484 skb->dev = local->mdev;
1485 /* copy status into skb->cb for use by tasklet */
1486 memcpy(skb->cb, status, sizeof(*status));
1487 skb->pkt_type = IEEE80211_RX_MSG;
1488 skb_queue_tail(&local->skb_queue, skb);
1489 tasklet_schedule(&local->tasklet);
1491 EXPORT_SYMBOL(ieee80211_rx_irqsafe);