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/jiffies.h>
13 #include <linux/kernel.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rcupdate.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
29 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
30 struct tid_ampdu_rx *tid_agg_rx,
31 struct sk_buff *skb, u16 mpdu_seq_num,
34 * monitor mode reception
36 * This function cleans up the SKB, i.e. it removes all the stuff
37 * only useful for monitoring.
39 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
43 skb_pull(skb, rtap_len);
45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
47 skb_trim(skb, skb->len - FCS_LEN);
59 static inline int should_drop_frame(struct ieee80211_rx_status *status,
64 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
66 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
68 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
70 if (ieee80211_is_ctl(hdr->frame_control) &&
71 !ieee80211_is_pspoll(hdr->frame_control) &&
72 !ieee80211_is_back_req(hdr->frame_control))
78 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
79 struct ieee80211_rx_status *status)
83 /* always present fields */
84 len = sizeof(struct ieee80211_radiotap_header) + 9;
86 if (status->flag & RX_FLAG_TSFT)
88 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB ||
89 local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
91 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
94 if (len & 1) /* padding for RX_FLAGS if necessary */
97 /* make sure radiotap starts at a naturally aligned address */
99 len = roundup(len, 8);
105 * ieee80211_add_rx_radiotap_header - add radiotap header
107 * add a radiotap header containing all the fields which the hardware provided.
110 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
112 struct ieee80211_rx_status *status,
113 struct ieee80211_rate *rate,
116 struct ieee80211_radiotap_header *rthdr;
119 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
120 memset(rthdr, 0, rtap_len);
122 /* radiotap header, set always present flags */
124 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
125 (1 << IEEE80211_RADIOTAP_RATE) |
126 (1 << IEEE80211_RADIOTAP_CHANNEL) |
127 (1 << IEEE80211_RADIOTAP_ANTENNA) |
128 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
129 rthdr->it_len = cpu_to_le16(rtap_len);
131 pos = (unsigned char *)(rthdr+1);
133 /* the order of the following fields is important */
135 /* IEEE80211_RADIOTAP_TSFT */
136 if (status->flag & RX_FLAG_TSFT) {
137 *(__le64 *)pos = cpu_to_le64(status->mactime);
139 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
143 /* IEEE80211_RADIOTAP_FLAGS */
144 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
145 *pos |= IEEE80211_RADIOTAP_F_FCS;
146 if (status->flag & RX_FLAG_SHORTPRE)
147 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
150 /* IEEE80211_RADIOTAP_RATE */
151 *pos = rate->bitrate / 5;
154 /* IEEE80211_RADIOTAP_CHANNEL */
155 *(__le16 *)pos = cpu_to_le16(status->freq);
157 if (status->band == IEEE80211_BAND_5GHZ)
158 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
159 IEEE80211_CHAN_5GHZ);
160 else if (rate->flags & IEEE80211_RATE_ERP_G)
161 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
162 IEEE80211_CHAN_2GHZ);
164 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
165 IEEE80211_CHAN_2GHZ);
168 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
169 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
170 *pos = status->signal;
172 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
176 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
177 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
178 *pos = status->noise;
180 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
184 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
186 /* IEEE80211_RADIOTAP_ANTENNA */
187 *pos = status->antenna;
190 /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
191 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
192 *pos = status->signal;
194 cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
198 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
200 /* IEEE80211_RADIOTAP_RX_FLAGS */
201 /* ensure 2 byte alignment for the 2 byte field as required */
202 if ((pos - (unsigned char *)rthdr) & 1)
204 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
205 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
206 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
211 * This function copies a received frame to all monitor interfaces and
212 * returns a cleaned-up SKB that no longer includes the FCS nor the
213 * radiotap header the driver might have added.
215 static struct sk_buff *
216 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
217 struct ieee80211_rx_status *status,
218 struct ieee80211_rate *rate)
220 struct ieee80211_sub_if_data *sdata;
221 int needed_headroom = 0;
222 struct sk_buff *skb, *skb2;
223 struct net_device *prev_dev = NULL;
224 int present_fcs_len = 0;
228 * First, we may need to make a copy of the skb because
229 * (1) we need to modify it for radiotap (if not present), and
230 * (2) the other RX handlers will modify the skb we got.
232 * We don't need to, of course, if we aren't going to return
233 * the SKB because it has a bad FCS/PLCP checksum.
235 if (status->flag & RX_FLAG_RADIOTAP)
236 rtap_len = ieee80211_get_radiotap_len(origskb->data);
238 /* room for the radiotap header based on driver features */
239 needed_headroom = ieee80211_rx_radiotap_len(local, status);
241 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
242 present_fcs_len = FCS_LEN;
244 if (!local->monitors) {
245 if (should_drop_frame(status, origskb, present_fcs_len,
247 dev_kfree_skb(origskb);
251 return remove_monitor_info(local, origskb, rtap_len);
254 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
255 /* only need to expand headroom if necessary */
260 * This shouldn't trigger often because most devices have an
261 * RX header they pull before we get here, and that should
262 * be big enough for our radiotap information. We should
263 * probably export the length to drivers so that we can have
264 * them allocate enough headroom to start with.
266 if (skb_headroom(skb) < needed_headroom &&
267 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
273 * Need to make a copy and possibly remove radiotap header
274 * and FCS from the original.
276 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
278 origskb = remove_monitor_info(local, origskb, rtap_len);
284 /* if necessary, prepend radiotap information */
285 if (!(status->flag & RX_FLAG_RADIOTAP))
286 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
289 skb_reset_mac_header(skb);
290 skb->ip_summed = CHECKSUM_UNNECESSARY;
291 skb->pkt_type = PACKET_OTHERHOST;
292 skb->protocol = htons(ETH_P_802_2);
294 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
295 if (!netif_running(sdata->dev))
298 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
301 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
305 skb2 = skb_clone(skb, GFP_ATOMIC);
307 skb2->dev = prev_dev;
312 prev_dev = sdata->dev;
313 sdata->dev->stats.rx_packets++;
314 sdata->dev->stats.rx_bytes += skb->len;
327 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
329 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
332 /* does the frame have a qos control field? */
333 if (ieee80211_is_data_qos(hdr->frame_control)) {
334 u8 *qc = ieee80211_get_qos_ctl(hdr);
335 /* frame has qos control */
336 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
337 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
338 rx->flags |= IEEE80211_RX_AMSDU;
340 rx->flags &= ~IEEE80211_RX_AMSDU;
343 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
345 * Sequence numbers for management frames, QoS data
346 * frames with a broadcast/multicast address in the
347 * Address 1 field, and all non-QoS data frames sent
348 * by QoS STAs are assigned using an additional single
349 * modulo-4096 counter, [...]
351 * We also use that counter for non-QoS STAs.
353 tid = NUM_RX_DATA_QUEUES - 1;
357 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
358 * For now, set skb->priority to 0 for other cases. */
359 rx->skb->priority = (tid > 7) ? 0 : tid;
362 static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
364 #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
365 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
368 if (!ieee80211_is_data_present(hdr->frame_control))
372 * Drivers are required to align the payload data in a way that
373 * guarantees that the contained IP header is aligned to a four-
374 * byte boundary. In the case of regular frames, this simply means
375 * aligning the payload to a four-byte boundary (because either
376 * the IP header is directly contained, or IV/RFC1042 headers that
377 * have a length divisible by four are in front of it.
379 * With A-MSDU frames, however, the payload data address must
380 * yield two modulo four because there are 14-byte 802.3 headers
381 * within the A-MSDU frames that push the IP header further back
382 * to a multiple of four again. Thankfully, the specs were sane
383 * enough this time around to require padding each A-MSDU subframe
384 * to a length that is a multiple of four.
386 * Padding like atheros hardware adds which is inbetween the 802.11
387 * header and the payload is not supported, the driver is required
388 * to move the 802.11 header further back in that case.
390 hdrlen = ieee80211_hdrlen(hdr->frame_control);
391 if (rx->flags & IEEE80211_RX_AMSDU)
393 WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
400 static ieee80211_rx_result debug_noinline
401 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
403 struct ieee80211_local *local = rx->local;
404 struct sk_buff *skb = rx->skb;
406 if (unlikely(local->sta_hw_scanning))
407 return ieee80211_sta_rx_scan(rx->sdata, skb, rx->status);
409 if (unlikely(local->sta_sw_scanning)) {
410 /* drop all the other packets during a software scan anyway */
411 if (ieee80211_sta_rx_scan(rx->sdata, skb, rx->status)
417 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
418 /* scanning finished during invoking of handlers */
419 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
420 return RX_DROP_UNUSABLE;
426 static ieee80211_rx_result
427 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
429 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
430 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
432 if (ieee80211_is_data(hdr->frame_control)) {
433 if (!ieee80211_has_a4(hdr->frame_control))
434 return RX_DROP_MONITOR;
435 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
436 return RX_DROP_MONITOR;
439 /* If there is not an established peer link and this is not a peer link
440 * establisment frame, beacon or probe, drop the frame.
443 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
444 struct ieee80211_mgmt *mgmt;
446 if (!ieee80211_is_mgmt(hdr->frame_control))
447 return RX_DROP_MONITOR;
449 if (ieee80211_is_action(hdr->frame_control)) {
450 mgmt = (struct ieee80211_mgmt *)hdr;
451 if (mgmt->u.action.category != PLINK_CATEGORY)
452 return RX_DROP_MONITOR;
456 if (ieee80211_is_probe_req(hdr->frame_control) ||
457 ieee80211_is_probe_resp(hdr->frame_control) ||
458 ieee80211_is_beacon(hdr->frame_control))
461 return RX_DROP_MONITOR;
465 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
467 if (ieee80211_is_data(hdr->frame_control) &&
468 is_multicast_ether_addr(hdr->addr1) &&
469 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
470 return RX_DROP_MONITOR;
477 static ieee80211_rx_result debug_noinline
478 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
482 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
483 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
484 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
485 rx->sta->last_seq_ctrl[rx->queue] ==
487 if (rx->flags & IEEE80211_RX_RA_MATCH) {
488 rx->local->dot11FrameDuplicateCount++;
489 rx->sta->num_duplicates++;
491 return RX_DROP_MONITOR;
493 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
496 if (unlikely(rx->skb->len < 16)) {
497 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
498 return RX_DROP_MONITOR;
501 /* Drop disallowed frame classes based on STA auth/assoc state;
502 * IEEE 802.11, Chap 5.5.
504 * 80211.o does filtering only based on association state, i.e., it
505 * drops Class 3 frames from not associated stations. hostapd sends
506 * deauth/disassoc frames when needed. In addition, hostapd is
507 * responsible for filtering on both auth and assoc states.
510 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
511 return ieee80211_rx_mesh_check(rx);
513 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
514 ieee80211_is_pspoll(hdr->frame_control)) &&
515 rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
516 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
517 if ((!ieee80211_has_fromds(hdr->frame_control) &&
518 !ieee80211_has_tods(hdr->frame_control) &&
519 ieee80211_is_data(hdr->frame_control)) ||
520 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
521 /* Drop IBSS frames and frames for other hosts
523 return RX_DROP_MONITOR;
526 return RX_DROP_MONITOR;
533 static ieee80211_rx_result debug_noinline
534 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
536 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
539 ieee80211_rx_result result = RX_DROP_UNUSABLE;
540 struct ieee80211_key *stakey = NULL;
545 * There are three types of keys:
547 * - PTK (pairwise keys)
548 * - STK (station-to-station pairwise keys)
550 * When selecting a key, we have to distinguish between multicast
551 * (including broadcast) and unicast frames, the latter can only
552 * use PTKs and STKs while the former always use GTKs. Unless, of
553 * course, actual WEP keys ("pre-RSNA") are used, then unicast
554 * frames can also use key indizes like GTKs. Hence, if we don't
555 * have a PTK/STK we check the key index for a WEP key.
557 * Note that in a regular BSS, multicast frames are sent by the
558 * AP only, associated stations unicast the frame to the AP first
559 * which then multicasts it on their behalf.
561 * There is also a slight problem in IBSS mode: GTKs are negotiated
562 * with each station, that is something we don't currently handle.
563 * The spec seems to expect that one negotiates the same key with
564 * every station but there's no such requirement; VLANs could be
568 if (!ieee80211_has_protected(hdr->frame_control))
572 * No point in finding a key and decrypting if the frame is neither
573 * addressed to us nor a multicast frame.
575 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
579 stakey = rcu_dereference(rx->sta->key);
581 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
585 * The device doesn't give us the IV so we won't be
586 * able to look up the key. That's ok though, we
587 * don't need to decrypt the frame, we just won't
588 * be able to keep statistics accurate.
589 * Except for key threshold notifications, should
590 * we somehow allow the driver to tell us which key
591 * the hardware used if this flag is set?
593 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
594 (rx->status->flag & RX_FLAG_IV_STRIPPED))
597 hdrlen = ieee80211_hdrlen(hdr->frame_control);
599 if (rx->skb->len < 8 + hdrlen)
600 return RX_DROP_UNUSABLE; /* TODO: count this? */
603 * no need to call ieee80211_wep_get_keyidx,
604 * it verifies a bunch of things we've done already
606 keyidx = rx->skb->data[hdrlen + 3] >> 6;
608 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
611 * RSNA-protected unicast frames should always be sent with
612 * pairwise or station-to-station keys, but for WEP we allow
613 * using a key index as well.
615 if (rx->key && rx->key->conf.alg != ALG_WEP &&
616 !is_multicast_ether_addr(hdr->addr1))
621 rx->key->tx_rx_count++;
622 /* TODO: add threshold stuff again */
624 return RX_DROP_MONITOR;
627 /* Check for weak IVs if possible */
628 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
629 ieee80211_is_data(hdr->frame_control) &&
630 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
631 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
632 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
633 rx->sta->wep_weak_iv_count++;
635 switch (rx->key->conf.alg) {
637 result = ieee80211_crypto_wep_decrypt(rx);
640 result = ieee80211_crypto_tkip_decrypt(rx);
643 result = ieee80211_crypto_ccmp_decrypt(rx);
647 /* either the frame has been decrypted or will be dropped */
648 rx->status->flag |= RX_FLAG_DECRYPTED;
653 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
655 struct ieee80211_sub_if_data *sdata;
656 DECLARE_MAC_BUF(mac);
660 atomic_inc(&sdata->bss->num_sta_ps);
661 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
662 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
663 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
664 dev->name, print_mac(mac, sta->addr), sta->aid);
665 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
668 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
670 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
673 struct ieee80211_sub_if_data *sdata;
674 struct ieee80211_tx_info *info;
675 DECLARE_MAC_BUF(mac);
679 atomic_dec(&sdata->bss->num_sta_ps);
681 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
683 if (!skb_queue_empty(&sta->ps_tx_buf))
684 sta_info_clear_tim_bit(sta);
686 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
687 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
688 dev->name, print_mac(mac, sta->addr), sta->aid);
689 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
691 /* Send all buffered frames to the station */
692 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
693 info = IEEE80211_SKB_CB(skb);
695 info->flags |= IEEE80211_TX_CTL_REQUEUE;
698 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
699 info = IEEE80211_SKB_CB(skb);
700 local->total_ps_buffered--;
702 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
703 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
704 "since STA not sleeping anymore\n", dev->name,
705 print_mac(mac, sta->addr), sta->aid);
706 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
707 info->flags |= IEEE80211_TX_CTL_REQUEUE;
714 static ieee80211_rx_result debug_noinline
715 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
717 struct sta_info *sta = rx->sta;
718 struct net_device *dev = rx->dev;
719 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
724 /* Update last_rx only for IBSS packets which are for the current
725 * BSSID to avoid keeping the current IBSS network alive in cases where
726 * other STAs are using different BSSID. */
727 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
728 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
729 IEEE80211_IF_TYPE_IBSS);
730 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
731 sta->last_rx = jiffies;
733 if (!is_multicast_ether_addr(hdr->addr1) ||
734 rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
735 /* Update last_rx only for unicast frames in order to prevent
736 * the Probe Request frames (the only broadcast frames from a
737 * STA in infrastructure mode) from keeping a connection alive.
738 * Mesh beacons will update last_rx when if they are found to
739 * match the current local configuration when processed.
741 sta->last_rx = jiffies;
744 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
748 sta->rx_bytes += rx->skb->len;
749 sta->last_signal = rx->status->signal;
750 sta->last_qual = rx->status->qual;
751 sta->last_noise = rx->status->noise;
753 if (!ieee80211_has_morefrags(hdr->frame_control) &&
754 (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP ||
755 rx->sdata->vif.type == IEEE80211_IF_TYPE_VLAN)) {
756 /* Change STA power saving mode only in the end of a frame
757 * exchange sequence */
758 if (test_sta_flags(sta, WLAN_STA_PS) &&
759 !ieee80211_has_pm(hdr->frame_control))
760 rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
761 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
762 ieee80211_has_pm(hdr->frame_control))
763 ap_sta_ps_start(dev, sta);
766 /* Drop data::nullfunc frames silently, since they are used only to
767 * control station power saving mode. */
768 if (ieee80211_is_nullfunc(hdr->frame_control)) {
769 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
770 /* Update counter and free packet here to avoid counting this
771 * as a dropped packed. */
773 dev_kfree_skb(rx->skb);
778 } /* ieee80211_rx_h_sta_process */
780 static inline struct ieee80211_fragment_entry *
781 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
782 unsigned int frag, unsigned int seq, int rx_queue,
783 struct sk_buff **skb)
785 struct ieee80211_fragment_entry *entry;
788 idx = sdata->fragment_next;
789 entry = &sdata->fragments[sdata->fragment_next++];
790 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
791 sdata->fragment_next = 0;
793 if (!skb_queue_empty(&entry->skb_list)) {
794 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
795 struct ieee80211_hdr *hdr =
796 (struct ieee80211_hdr *) entry->skb_list.next->data;
797 DECLARE_MAC_BUF(mac);
798 DECLARE_MAC_BUF(mac2);
799 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
800 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
801 "addr1=%s addr2=%s\n",
802 sdata->dev->name, idx,
803 jiffies - entry->first_frag_time, entry->seq,
804 entry->last_frag, print_mac(mac, hdr->addr1),
805 print_mac(mac2, hdr->addr2));
807 __skb_queue_purge(&entry->skb_list);
810 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
812 entry->first_frag_time = jiffies;
814 entry->rx_queue = rx_queue;
815 entry->last_frag = frag;
817 entry->extra_len = 0;
822 static inline struct ieee80211_fragment_entry *
823 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
824 unsigned int frag, unsigned int seq,
825 int rx_queue, struct ieee80211_hdr *hdr)
827 struct ieee80211_fragment_entry *entry;
830 idx = sdata->fragment_next;
831 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
832 struct ieee80211_hdr *f_hdr;
836 idx = IEEE80211_FRAGMENT_MAX - 1;
838 entry = &sdata->fragments[idx];
839 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
840 entry->rx_queue != rx_queue ||
841 entry->last_frag + 1 != frag)
844 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
847 * Check ftype and addresses are equal, else check next fragment
849 if (((hdr->frame_control ^ f_hdr->frame_control) &
850 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
851 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
852 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
855 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
856 __skb_queue_purge(&entry->skb_list);
865 static ieee80211_rx_result debug_noinline
866 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
868 struct ieee80211_hdr *hdr;
871 unsigned int frag, seq;
872 struct ieee80211_fragment_entry *entry;
874 DECLARE_MAC_BUF(mac);
876 hdr = (struct ieee80211_hdr *)rx->skb->data;
877 fc = hdr->frame_control;
878 sc = le16_to_cpu(hdr->seq_ctrl);
879 frag = sc & IEEE80211_SCTL_FRAG;
881 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
882 (rx->skb)->len < 24 ||
883 is_multicast_ether_addr(hdr->addr1))) {
887 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
889 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
892 /* This is the first fragment of a new frame. */
893 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
894 rx->queue, &(rx->skb));
895 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
896 ieee80211_has_protected(fc)) {
897 /* Store CCMP PN so that we can verify that the next
898 * fragment has a sequential PN value. */
900 memcpy(entry->last_pn,
901 rx->key->u.ccmp.rx_pn[rx->queue],
907 /* This is a fragment for a frame that should already be pending in
908 * fragment cache. Add this fragment to the end of the pending entry.
910 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
912 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
913 return RX_DROP_MONITOR;
916 /* Verify that MPDUs within one MSDU have sequential PN values.
917 * (IEEE 802.11i, 8.3.3.4.5) */
920 u8 pn[CCMP_PN_LEN], *rpn;
921 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
922 return RX_DROP_UNUSABLE;
923 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
924 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
929 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
930 if (memcmp(pn, rpn, CCMP_PN_LEN))
931 return RX_DROP_UNUSABLE;
932 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
935 skb_pull(rx->skb, ieee80211_hdrlen(fc));
936 __skb_queue_tail(&entry->skb_list, rx->skb);
937 entry->last_frag = frag;
938 entry->extra_len += rx->skb->len;
939 if (ieee80211_has_morefrags(fc)) {
944 rx->skb = __skb_dequeue(&entry->skb_list);
945 if (skb_tailroom(rx->skb) < entry->extra_len) {
946 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
947 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
949 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
950 __skb_queue_purge(&entry->skb_list);
951 return RX_DROP_UNUSABLE;
954 while ((skb = __skb_dequeue(&entry->skb_list))) {
955 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
959 /* Complete frame has been reassembled - process it now */
960 rx->flags |= IEEE80211_RX_FRAGMENTED;
964 rx->sta->rx_packets++;
965 if (is_multicast_ether_addr(hdr->addr1))
966 rx->local->dot11MulticastReceivedFrameCount++;
968 ieee80211_led_rx(rx->local);
972 static ieee80211_rx_result debug_noinline
973 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
975 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
978 DECLARE_MAC_BUF(mac);
979 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
981 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
982 !(rx->flags & IEEE80211_RX_RA_MATCH)))
985 if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
986 (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
987 return RX_DROP_UNUSABLE;
989 skb = skb_dequeue(&rx->sta->tx_filtered);
991 skb = skb_dequeue(&rx->sta->ps_tx_buf);
993 rx->local->total_ps_buffered--;
995 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
996 skb_queue_empty(&rx->sta->ps_tx_buf);
999 struct ieee80211_hdr *hdr =
1000 (struct ieee80211_hdr *) skb->data;
1003 * Tell TX path to send one frame even though the STA may
1004 * still remain is PS mode after this frame exchange.
1006 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1008 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1009 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
1010 print_mac(mac, rx->sta->addr), rx->sta->aid,
1011 skb_queue_len(&rx->sta->ps_tx_buf));
1012 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1014 /* Use MoreData flag to indicate whether there are more
1015 * buffered frames for this STA */
1016 if (no_pending_pkts)
1017 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1019 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1021 dev_queue_xmit(skb);
1023 if (no_pending_pkts)
1024 sta_info_clear_tim_bit(rx->sta);
1025 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1026 } else if (!rx->sent_ps_buffered) {
1028 * FIXME: This can be the result of a race condition between
1029 * us expiring a frame and the station polling for it.
1030 * Should we send it a null-func frame indicating we
1031 * have nothing buffered for it?
1033 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
1034 "though there are no buffered frames for it\n",
1035 rx->dev->name, print_mac(mac, rx->sta->addr));
1036 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1039 /* Free PS Poll skb here instead of returning RX_DROP that would
1040 * count as an dropped frame. */
1041 dev_kfree_skb(rx->skb);
1046 static ieee80211_rx_result debug_noinline
1047 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1049 u8 *data = rx->skb->data;
1050 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1052 if (!ieee80211_is_data_qos(hdr->frame_control))
1055 /* remove the qos control field, update frame type and meta-data */
1056 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1057 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1058 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1059 /* change frame type to non QOS */
1060 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1066 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1068 if (unlikely(!rx->sta ||
1069 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1076 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1079 * Pass through unencrypted frames if the hardware has
1080 * decrypted them already.
1082 if (rx->status->flag & RX_FLAG_DECRYPTED)
1085 /* Drop unencrypted frames if key is set. */
1086 if (unlikely(!ieee80211_has_protected(fc) &&
1087 !ieee80211_is_nullfunc(fc) &&
1088 (rx->key || rx->sdata->drop_unencrypted)))
1095 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1097 struct net_device *dev = rx->dev;
1098 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1099 u16 hdrlen, ethertype;
1102 u8 src[ETH_ALEN] __aligned(2);
1103 struct sk_buff *skb = rx->skb;
1104 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1105 DECLARE_MAC_BUF(mac);
1106 DECLARE_MAC_BUF(mac2);
1107 DECLARE_MAC_BUF(mac3);
1108 DECLARE_MAC_BUF(mac4);
1110 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1113 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1115 if (ieee80211_vif_is_mesh(&sdata->vif))
1116 hdrlen += ieee80211_get_mesh_hdrlen(
1117 (struct ieee80211s_hdr *) (skb->data + hdrlen));
1119 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1121 * IEEE 802.11 address fields:
1122 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1123 * 0 0 DA SA BSSID n/a
1124 * 0 1 DA BSSID SA n/a
1125 * 1 0 BSSID SA DA n/a
1128 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1129 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
1131 switch (hdr->frame_control &
1132 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1133 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS):
1134 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
1135 sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
1138 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1139 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
1140 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
1143 case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS):
1144 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
1145 (is_multicast_ether_addr(dst) &&
1146 !compare_ether_addr(src, dev->dev_addr)))
1149 case __constant_cpu_to_le16(0):
1150 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1155 if (unlikely(skb->len - hdrlen < 8))
1158 payload = skb->data + hdrlen;
1159 ethertype = (payload[6] << 8) | payload[7];
1161 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1162 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1163 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1164 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1165 * replace EtherType */
1166 skb_pull(skb, hdrlen + 6);
1167 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1168 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1170 struct ethhdr *ehdr;
1173 skb_pull(skb, hdrlen);
1174 len = htons(skb->len);
1175 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1176 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1177 memcpy(ehdr->h_source, src, ETH_ALEN);
1178 ehdr->h_proto = len;
1184 * requires that rx->skb is a frame with ethernet header
1186 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1188 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1189 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1190 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1193 * Allow EAPOL frames to us/the PAE group address regardless
1194 * of whether the frame was encrypted or not.
1196 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1197 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1198 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1201 if (ieee80211_802_1x_port_control(rx) ||
1202 ieee80211_drop_unencrypted(rx, fc))
1209 * requires that rx->skb is a frame with ethernet header
1212 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1214 struct net_device *dev = rx->dev;
1215 struct ieee80211_local *local = rx->local;
1216 struct sk_buff *skb, *xmit_skb;
1217 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1218 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1219 struct sta_info *dsta;
1224 if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1225 sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
1226 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1227 if (is_multicast_ether_addr(ehdr->h_dest)) {
1229 * send multicast frames both to higher layers in
1230 * local net stack and back to the wireless medium
1232 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1233 if (!xmit_skb && net_ratelimit())
1234 printk(KERN_DEBUG "%s: failed to clone "
1235 "multicast frame\n", dev->name);
1237 dsta = sta_info_get(local, skb->data);
1238 if (dsta && dsta->sdata->dev == dev) {
1240 * The destination station is associated to
1241 * this AP (in this VLAN), so send the frame
1242 * directly to it and do not pass it to local
1252 /* deliver to local stack */
1253 skb->protocol = eth_type_trans(skb, dev);
1254 memset(skb->cb, 0, sizeof(skb->cb));
1259 /* send to wireless media */
1260 xmit_skb->protocol = htons(ETH_P_802_3);
1261 skb_reset_network_header(xmit_skb);
1262 skb_reset_mac_header(xmit_skb);
1263 dev_queue_xmit(xmit_skb);
1267 static ieee80211_rx_result debug_noinline
1268 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1270 struct net_device *dev = rx->dev;
1271 struct ieee80211_local *local = rx->local;
1274 struct sk_buff *skb = rx->skb, *frame = NULL;
1275 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1276 __le16 fc = hdr->frame_control;
1277 const struct ethhdr *eth;
1281 DECLARE_MAC_BUF(mac);
1283 if (unlikely(!ieee80211_is_data(fc)))
1286 if (unlikely(!ieee80211_is_data_present(fc)))
1287 return RX_DROP_MONITOR;
1289 if (!(rx->flags & IEEE80211_RX_AMSDU))
1292 err = ieee80211_data_to_8023(rx);
1294 return RX_DROP_UNUSABLE;
1298 dev->stats.rx_packets++;
1299 dev->stats.rx_bytes += skb->len;
1301 /* skip the wrapping header */
1302 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1304 return RX_DROP_UNUSABLE;
1306 while (skb != frame) {
1308 __be16 len = eth->h_proto;
1309 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1311 remaining = skb->len;
1312 memcpy(dst, eth->h_dest, ETH_ALEN);
1313 memcpy(src, eth->h_source, ETH_ALEN);
1315 padding = ((4 - subframe_len) & 0x3);
1316 /* the last MSDU has no padding */
1317 if (subframe_len > remaining)
1318 return RX_DROP_UNUSABLE;
1320 skb_pull(skb, sizeof(struct ethhdr));
1321 /* if last subframe reuse skb */
1322 if (remaining <= subframe_len + padding)
1325 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1329 return RX_DROP_UNUSABLE;
1331 skb_reserve(frame, local->hw.extra_tx_headroom +
1332 sizeof(struct ethhdr));
1333 memcpy(skb_put(frame, ntohs(len)), skb->data,
1336 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1339 dev_kfree_skb(frame);
1340 return RX_DROP_UNUSABLE;
1344 skb_reset_network_header(frame);
1346 frame->priority = skb->priority;
1349 payload = frame->data;
1350 ethertype = (payload[6] << 8) | payload[7];
1352 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1353 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1354 compare_ether_addr(payload,
1355 bridge_tunnel_header) == 0)) {
1356 /* remove RFC1042 or Bridge-Tunnel
1357 * encapsulation and replace EtherType */
1359 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1360 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1362 memcpy(skb_push(frame, sizeof(__be16)),
1363 &len, sizeof(__be16));
1364 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1365 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1368 if (!ieee80211_frame_allowed(rx, fc)) {
1369 if (skb == frame) /* last frame */
1370 return RX_DROP_UNUSABLE;
1371 dev_kfree_skb(frame);
1375 ieee80211_deliver_skb(rx);
1381 static ieee80211_rx_result debug_noinline
1382 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1384 struct ieee80211_hdr *hdr;
1385 struct ieee80211s_hdr *mesh_hdr;
1386 unsigned int hdrlen;
1387 struct sk_buff *skb = rx->skb, *fwd_skb;
1389 hdr = (struct ieee80211_hdr *) skb->data;
1390 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1391 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1393 if (!ieee80211_is_data(hdr->frame_control))
1398 return RX_DROP_MONITOR;
1400 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1405 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1407 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.sta,
1408 dropped_frames_ttl);
1410 struct ieee80211_hdr *fwd_hdr;
1411 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1413 if (!fwd_skb && net_ratelimit())
1414 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1417 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1419 * Save TA to addr1 to send TA a path error if a
1420 * suitable next hop is not found
1422 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1423 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1424 fwd_skb->dev = rx->local->mdev;
1425 fwd_skb->iif = rx->dev->ifindex;
1426 dev_queue_xmit(fwd_skb);
1430 if (is_multicast_ether_addr(hdr->addr3) ||
1431 rx->dev->flags & IFF_PROMISC)
1434 return RX_DROP_MONITOR;
1438 static ieee80211_rx_result debug_noinline
1439 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1441 struct net_device *dev = rx->dev;
1442 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1443 __le16 fc = hdr->frame_control;
1446 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1449 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1450 return RX_DROP_MONITOR;
1452 err = ieee80211_data_to_8023(rx);
1454 return RX_DROP_UNUSABLE;
1456 if (!ieee80211_frame_allowed(rx, fc))
1457 return RX_DROP_MONITOR;
1461 dev->stats.rx_packets++;
1462 dev->stats.rx_bytes += rx->skb->len;
1464 ieee80211_deliver_skb(rx);
1469 static ieee80211_rx_result debug_noinline
1470 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1472 struct ieee80211_local *local = rx->local;
1473 struct ieee80211_hw *hw = &local->hw;
1474 struct sk_buff *skb = rx->skb;
1475 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1476 struct tid_ampdu_rx *tid_agg_rx;
1480 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1483 if (ieee80211_is_back_req(bar->frame_control)) {
1486 tid = le16_to_cpu(bar->control) >> 12;
1487 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1488 != HT_AGG_STATE_OPERATIONAL)
1490 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1492 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1494 /* reset session timer */
1495 if (tid_agg_rx->timeout) {
1496 unsigned long expires =
1497 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1498 mod_timer(&tid_agg_rx->session_timer, expires);
1501 /* manage reordering buffer according to requested */
1502 /* sequence number */
1504 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1507 return RX_DROP_UNUSABLE;
1513 static ieee80211_rx_result debug_noinline
1514 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1516 struct ieee80211_local *local = rx->local;
1517 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1518 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1519 int len = rx->skb->len;
1521 if (!ieee80211_is_action(mgmt->frame_control))
1525 return RX_DROP_MONITOR;
1527 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1528 return RX_DROP_MONITOR;
1530 /* all categories we currently handle have action_code */
1531 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1532 return RX_DROP_MONITOR;
1535 * FIXME: revisit this, I'm sure we should handle most
1536 * of these frames in other modes as well!
1538 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
1539 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1540 return RX_DROP_MONITOR;
1542 switch (mgmt->u.action.category) {
1543 case WLAN_CATEGORY_BACK:
1544 switch (mgmt->u.action.u.addba_req.action_code) {
1545 case WLAN_ACTION_ADDBA_REQ:
1546 if (len < (IEEE80211_MIN_ACTION_SIZE +
1547 sizeof(mgmt->u.action.u.addba_req)))
1548 return RX_DROP_MONITOR;
1549 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1551 case WLAN_ACTION_ADDBA_RESP:
1552 if (len < (IEEE80211_MIN_ACTION_SIZE +
1553 sizeof(mgmt->u.action.u.addba_resp)))
1554 return RX_DROP_MONITOR;
1555 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1557 case WLAN_ACTION_DELBA:
1558 if (len < (IEEE80211_MIN_ACTION_SIZE +
1559 sizeof(mgmt->u.action.u.delba)))
1560 return RX_DROP_MONITOR;
1561 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1565 case WLAN_CATEGORY_SPECTRUM_MGMT:
1566 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1567 return RX_DROP_MONITOR;
1568 switch (mgmt->u.action.u.measurement.action_code) {
1569 case WLAN_ACTION_SPCT_MSR_REQ:
1570 if (len < (IEEE80211_MIN_ACTION_SIZE +
1571 sizeof(mgmt->u.action.u.measurement)))
1572 return RX_DROP_MONITOR;
1573 ieee80211_process_measurement_req(sdata, mgmt, len);
1581 rx->sta->rx_packets++;
1582 dev_kfree_skb(rx->skb);
1586 static ieee80211_rx_result debug_noinline
1587 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1589 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1591 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1592 return RX_DROP_MONITOR;
1594 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
1595 sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1596 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT)
1597 return RX_DROP_MONITOR;
1599 if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)
1600 return RX_DROP_MONITOR;
1602 ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
1606 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1607 struct ieee80211_hdr *hdr,
1608 struct ieee80211_rx_data *rx)
1611 unsigned int hdrlen;
1612 DECLARE_MAC_BUF(mac);
1613 DECLARE_MAC_BUF(mac2);
1615 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1616 if (rx->skb->len >= hdrlen + 4)
1617 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1623 * Some hardware seem to generate incorrect Michael MIC
1624 * reports; ignore them to avoid triggering countermeasures.
1629 if (!ieee80211_has_protected(hdr->frame_control))
1632 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
1634 * APs with pairwise keys should never receive Michael MIC
1635 * errors for non-zero keyidx because these are reserved for
1636 * group keys and only the AP is sending real multicast
1637 * frames in the BSS.
1642 if (!ieee80211_is_data(hdr->frame_control) &&
1643 !ieee80211_is_auth(hdr->frame_control))
1646 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
1648 dev_kfree_skb(rx->skb);
1652 /* TODO: use IEEE80211_RX_FRAGMENTED */
1653 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1655 struct ieee80211_sub_if_data *sdata;
1656 struct ieee80211_local *local = rx->local;
1657 struct ieee80211_rtap_hdr {
1658 struct ieee80211_radiotap_header hdr;
1663 } __attribute__ ((packed)) *rthdr;
1664 struct sk_buff *skb = rx->skb, *skb2;
1665 struct net_device *prev_dev = NULL;
1666 struct ieee80211_rx_status *status = rx->status;
1668 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1671 if (skb_headroom(skb) < sizeof(*rthdr) &&
1672 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1675 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1676 memset(rthdr, 0, sizeof(*rthdr));
1677 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1678 rthdr->hdr.it_present =
1679 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1680 (1 << IEEE80211_RADIOTAP_RATE) |
1681 (1 << IEEE80211_RADIOTAP_CHANNEL));
1683 rthdr->rate = rx->rate->bitrate / 5;
1684 rthdr->chan_freq = cpu_to_le16(status->freq);
1686 if (status->band == IEEE80211_BAND_5GHZ)
1687 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1688 IEEE80211_CHAN_5GHZ);
1690 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1691 IEEE80211_CHAN_2GHZ);
1693 skb_set_mac_header(skb, 0);
1694 skb->ip_summed = CHECKSUM_UNNECESSARY;
1695 skb->pkt_type = PACKET_OTHERHOST;
1696 skb->protocol = htons(ETH_P_802_2);
1698 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1699 if (!netif_running(sdata->dev))
1702 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
1703 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1707 skb2 = skb_clone(skb, GFP_ATOMIC);
1709 skb2->dev = prev_dev;
1714 prev_dev = sdata->dev;
1715 sdata->dev->stats.rx_packets++;
1716 sdata->dev->stats.rx_bytes += skb->len;
1720 skb->dev = prev_dev;
1726 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1734 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1735 struct ieee80211_rx_data *rx,
1736 struct sk_buff *skb)
1738 ieee80211_rx_result res = RX_DROP_MONITOR;
1742 rx->dev = sdata->dev;
1744 #define CALL_RXH(rxh) \
1747 if (res != RX_CONTINUE) \
1751 CALL_RXH(ieee80211_rx_h_passive_scan)
1752 CALL_RXH(ieee80211_rx_h_check)
1753 CALL_RXH(ieee80211_rx_h_decrypt)
1754 CALL_RXH(ieee80211_rx_h_sta_process)
1755 CALL_RXH(ieee80211_rx_h_defragment)
1756 CALL_RXH(ieee80211_rx_h_ps_poll)
1757 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1758 /* must be after MMIC verify so header is counted in MPDU mic */
1759 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1760 CALL_RXH(ieee80211_rx_h_amsdu)
1761 if (ieee80211_vif_is_mesh(&sdata->vif))
1762 CALL_RXH(ieee80211_rx_h_mesh_fwding);
1763 CALL_RXH(ieee80211_rx_h_data)
1764 CALL_RXH(ieee80211_rx_h_ctrl)
1765 CALL_RXH(ieee80211_rx_h_action)
1766 CALL_RXH(ieee80211_rx_h_mgmt)
1772 case RX_DROP_MONITOR:
1773 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1775 rx->sta->rx_dropped++;
1778 ieee80211_rx_cooked_monitor(rx);
1780 case RX_DROP_UNUSABLE:
1781 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1783 rx->sta->rx_dropped++;
1784 dev_kfree_skb(rx->skb);
1787 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1792 /* main receive path */
1794 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1795 u8 *bssid, struct ieee80211_rx_data *rx,
1796 struct ieee80211_hdr *hdr)
1798 int multicast = is_multicast_ether_addr(hdr->addr1);
1800 switch (sdata->vif.type) {
1801 case IEEE80211_IF_TYPE_STA:
1804 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1805 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1807 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1808 } else if (!multicast &&
1809 compare_ether_addr(sdata->dev->dev_addr,
1811 if (!(sdata->dev->flags & IFF_PROMISC))
1813 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1816 case IEEE80211_IF_TYPE_IBSS:
1819 if (ieee80211_is_beacon(hdr->frame_control)) {
1822 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1823 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1825 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1826 } else if (!multicast &&
1827 compare_ether_addr(sdata->dev->dev_addr,
1829 if (!(sdata->dev->flags & IFF_PROMISC))
1831 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1832 } else if (!rx->sta)
1833 rx->sta = ieee80211_ibss_add_sta(sdata, rx->skb,
1835 BIT(rx->status->rate_idx));
1837 case IEEE80211_IF_TYPE_MESH_POINT:
1839 compare_ether_addr(sdata->dev->dev_addr,
1841 if (!(sdata->dev->flags & IFF_PROMISC))
1844 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1847 case IEEE80211_IF_TYPE_VLAN:
1848 case IEEE80211_IF_TYPE_AP:
1850 if (compare_ether_addr(sdata->dev->dev_addr,
1853 } else if (!ieee80211_bssid_match(bssid,
1854 sdata->dev->dev_addr)) {
1855 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1857 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1860 case IEEE80211_IF_TYPE_WDS:
1861 if (bssid || !ieee80211_is_data(hdr->frame_control))
1863 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1866 case IEEE80211_IF_TYPE_MNTR:
1867 /* take everything */
1869 case IEEE80211_IF_TYPE_INVALID:
1870 /* should never get here */
1879 * This is the actual Rx frames handler. as it blongs to Rx path it must
1880 * be called with rcu_read_lock protection.
1882 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1883 struct sk_buff *skb,
1884 struct ieee80211_rx_status *status,
1885 struct ieee80211_rate *rate)
1887 struct ieee80211_local *local = hw_to_local(hw);
1888 struct ieee80211_sub_if_data *sdata;
1889 struct ieee80211_hdr *hdr;
1890 struct ieee80211_rx_data rx;
1892 struct ieee80211_sub_if_data *prev = NULL;
1893 struct sk_buff *skb_new;
1896 hdr = (struct ieee80211_hdr *)skb->data;
1897 memset(&rx, 0, sizeof(rx));
1904 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
1905 local->dot11ReceivedFragmentCount++;
1907 rx.sta = sta_info_get(local, hdr->addr2);
1909 rx.sdata = rx.sta->sdata;
1910 rx.dev = rx.sta->sdata->dev;
1913 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1914 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1918 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1919 rx.flags |= IEEE80211_RX_IN_SCAN;
1921 ieee80211_parse_qos(&rx);
1922 ieee80211_verify_ip_alignment(&rx);
1926 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1927 if (!netif_running(sdata->dev))
1930 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
1933 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1934 rx.flags |= IEEE80211_RX_RA_MATCH;
1935 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1941 * frame is destined for this interface, but if it's not
1942 * also for the previous one we handle that after the
1943 * loop to avoid copying the SKB once too much
1952 * frame was destined for the previous interface
1953 * so invoke RX handlers for it
1956 skb_new = skb_copy(skb, GFP_ATOMIC);
1958 if (net_ratelimit())
1959 printk(KERN_DEBUG "%s: failed to copy "
1960 "multicast frame for %s\n",
1961 wiphy_name(local->hw.wiphy),
1965 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
1969 ieee80211_invoke_rx_handlers(prev, &rx, skb);
1974 #define SEQ_MODULO 0x1000
1975 #define SEQ_MASK 0xfff
1977 static inline int seq_less(u16 sq1, u16 sq2)
1979 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1982 static inline u16 seq_inc(u16 sq)
1984 return ((sq + 1) & SEQ_MASK);
1987 static inline u16 seq_sub(u16 sq1, u16 sq2)
1989 return ((sq1 - sq2) & SEQ_MASK);
1994 * As it function blongs to Rx path it must be called with
1995 * the proper rcu_read_lock protection for its flow.
1997 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
1998 struct tid_ampdu_rx *tid_agg_rx,
1999 struct sk_buff *skb, u16 mpdu_seq_num,
2002 struct ieee80211_local *local = hw_to_local(hw);
2003 struct ieee80211_rx_status status;
2004 u16 head_seq_num, buf_size;
2006 struct ieee80211_supported_band *sband;
2007 struct ieee80211_rate *rate;
2009 buf_size = tid_agg_rx->buf_size;
2010 head_seq_num = tid_agg_rx->head_seq_num;
2012 /* frame with out of date sequence number */
2013 if (seq_less(mpdu_seq_num, head_seq_num)) {
2018 /* if frame sequence number exceeds our buffering window size or
2019 * block Ack Request arrived - release stored frames */
2020 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2021 /* new head to the ordering buffer */
2023 head_seq_num = mpdu_seq_num;
2026 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2027 /* release stored frames up to new head to stack */
2028 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2029 index = seq_sub(tid_agg_rx->head_seq_num,
2031 % tid_agg_rx->buf_size;
2033 if (tid_agg_rx->reorder_buf[index]) {
2034 /* release the reordered frames to stack */
2036 tid_agg_rx->reorder_buf[index]->cb,
2038 sband = local->hw.wiphy->bands[status.band];
2039 rate = &sband->bitrates[status.rate_idx];
2040 __ieee80211_rx_handle_packet(hw,
2041 tid_agg_rx->reorder_buf[index],
2043 tid_agg_rx->stored_mpdu_num--;
2044 tid_agg_rx->reorder_buf[index] = NULL;
2046 tid_agg_rx->head_seq_num =
2047 seq_inc(tid_agg_rx->head_seq_num);
2053 /* now the new frame is always in the range of the reordering */
2055 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2056 % tid_agg_rx->buf_size;
2057 /* check if we already stored this frame */
2058 if (tid_agg_rx->reorder_buf[index]) {
2063 /* if arrived mpdu is in the right order and nothing else stored */
2064 /* release it immediately */
2065 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2066 tid_agg_rx->stored_mpdu_num == 0) {
2067 tid_agg_rx->head_seq_num =
2068 seq_inc(tid_agg_rx->head_seq_num);
2072 /* put the frame in the reordering buffer */
2073 tid_agg_rx->reorder_buf[index] = skb;
2074 tid_agg_rx->stored_mpdu_num++;
2075 /* release the buffer until next missing frame */
2076 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2077 % tid_agg_rx->buf_size;
2078 while (tid_agg_rx->reorder_buf[index]) {
2079 /* release the reordered frame back to stack */
2080 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2082 sband = local->hw.wiphy->bands[status.band];
2083 rate = &sband->bitrates[status.rate_idx];
2084 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2086 tid_agg_rx->stored_mpdu_num--;
2087 tid_agg_rx->reorder_buf[index] = NULL;
2088 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2089 index = seq_sub(tid_agg_rx->head_seq_num,
2090 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2095 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2096 struct sk_buff *skb)
2098 struct ieee80211_hw *hw = &local->hw;
2099 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2100 struct sta_info *sta;
2101 struct tid_ampdu_rx *tid_agg_rx;
2107 sta = sta_info_get(local, hdr->addr2);
2111 /* filter the QoS data rx stream according to
2112 * STA/TID and check if this STA/TID is on aggregation */
2113 if (!ieee80211_is_data_qos(hdr->frame_control))
2116 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2118 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2121 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2123 /* qos null data frames are excluded */
2124 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2127 /* new un-ordered ampdu frame - process it */
2129 /* reset session timer */
2130 if (tid_agg_rx->timeout) {
2131 unsigned long expires =
2132 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2133 mod_timer(&tid_agg_rx->session_timer, expires);
2136 /* if this mpdu is fragmented - terminate rx aggregation session */
2137 sc = le16_to_cpu(hdr->seq_ctrl);
2138 if (sc & IEEE80211_SCTL_FRAG) {
2139 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->addr,
2140 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2145 /* according to mpdu sequence number deal with reordering buffer */
2146 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2147 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2154 * This is the receive path handler. It is called by a low level driver when an
2155 * 802.11 MPDU is received from the hardware.
2157 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2158 struct ieee80211_rx_status *status)
2160 struct ieee80211_local *local = hw_to_local(hw);
2161 struct ieee80211_rate *rate = NULL;
2162 struct ieee80211_supported_band *sband;
2164 if (status->band < 0 ||
2165 status->band >= IEEE80211_NUM_BANDS) {
2170 sband = local->hw.wiphy->bands[status->band];
2173 status->rate_idx < 0 ||
2174 status->rate_idx >= sband->n_bitrates) {
2179 rate = &sband->bitrates[status->rate_idx];
2182 * key references and virtual interfaces are protected using RCU
2183 * and this requires that we are in a read-side RCU section during
2184 * receive processing
2189 * Frames with failed FCS/PLCP checksum are not returned,
2190 * all other frames are returned without radiotap header
2191 * if it was previously present.
2192 * Also, frames with less than 16 bytes are dropped.
2194 skb = ieee80211_rx_monitor(local, skb, status, rate);
2200 if (!ieee80211_rx_reorder_ampdu(local, skb))
2201 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2205 EXPORT_SYMBOL(__ieee80211_rx);
2207 /* This is a version of the rx handler that can be called from hard irq
2208 * context. Post the skb on the queue and schedule the tasklet */
2209 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2210 struct ieee80211_rx_status *status)
2212 struct ieee80211_local *local = hw_to_local(hw);
2214 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2216 skb->dev = local->mdev;
2217 /* copy status into skb->cb for use by tasklet */
2218 memcpy(skb->cb, status, sizeof(*status));
2219 skb->pkt_type = IEEE80211_RX_MSG;
2220 skb_queue_tail(&local->skb_queue, skb);
2221 tasklet_schedule(&local->tasklet);
2223 EXPORT_SYMBOL(ieee80211_rx_irqsafe);