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 != NL80211_IFTYPE_MONITOR)
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->hw_scanning))
407 return ieee80211_scan_rx(rx->sdata, skb, rx->status);
409 if (unlikely(local->sw_scanning)) {
410 /* drop all the other packets during a software scan anyway */
411 if (ieee80211_scan_rx(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 * mac80211 filters only based on association state, i.e. it drops
505 * 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 != NL80211_IFTYPE_ADHOC &&
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 sta_info *sta)
655 struct ieee80211_sub_if_data *sdata = sta->sdata;
657 atomic_inc(&sdata->bss->num_sta_ps);
658 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
659 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
660 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
661 sdata->dev->name, sta->sta.addr, sta->sta.aid);
662 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
665 static int ap_sta_ps_end(struct sta_info *sta)
667 struct ieee80211_sub_if_data *sdata = sta->sdata;
668 struct ieee80211_local *local = sdata->local;
671 struct ieee80211_tx_info *info;
673 atomic_dec(&sdata->bss->num_sta_ps);
675 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
677 if (!skb_queue_empty(&sta->ps_tx_buf))
678 sta_info_clear_tim_bit(sta);
680 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
681 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
682 sdata->dev->name, sta->sta.addr, sta->sta.aid);
683 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
685 /* Send all buffered frames to the station */
686 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
687 info = IEEE80211_SKB_CB(skb);
689 info->flags |= IEEE80211_TX_CTL_REQUEUE;
692 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
693 info = IEEE80211_SKB_CB(skb);
694 local->total_ps_buffered--;
696 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
697 printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame "
698 "since STA not sleeping anymore\n", sdata->dev->name,
699 sta->sta.addr, sta->sta.aid);
700 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
701 info->flags |= IEEE80211_TX_CTL_REQUEUE;
708 static ieee80211_rx_result debug_noinline
709 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
711 struct sta_info *sta = rx->sta;
712 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
717 /* Update last_rx only for IBSS packets which are for the current
718 * BSSID to avoid keeping the current IBSS network alive in cases where
719 * other STAs are using different BSSID. */
720 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
721 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
722 NL80211_IFTYPE_ADHOC);
723 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
724 sta->last_rx = jiffies;
726 if (!is_multicast_ether_addr(hdr->addr1) ||
727 rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
728 /* Update last_rx only for unicast frames in order to prevent
729 * the Probe Request frames (the only broadcast frames from a
730 * STA in infrastructure mode) from keeping a connection alive.
731 * Mesh beacons will update last_rx when if they are found to
732 * match the current local configuration when processed.
734 sta->last_rx = jiffies;
737 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
741 sta->rx_bytes += rx->skb->len;
742 sta->last_signal = rx->status->signal;
743 sta->last_qual = rx->status->qual;
744 sta->last_noise = rx->status->noise;
746 if (!ieee80211_has_morefrags(hdr->frame_control) &&
747 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
748 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
749 /* Change STA power saving mode only in the end of a frame
750 * exchange sequence */
751 if (test_sta_flags(sta, WLAN_STA_PS) &&
752 !ieee80211_has_pm(hdr->frame_control))
753 rx->sent_ps_buffered += ap_sta_ps_end(sta);
754 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
755 ieee80211_has_pm(hdr->frame_control))
756 ap_sta_ps_start(sta);
759 /* Drop data::nullfunc frames silently, since they are used only to
760 * control station power saving mode. */
761 if (ieee80211_is_nullfunc(hdr->frame_control)) {
762 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
763 /* Update counter and free packet here to avoid counting this
764 * as a dropped packed. */
766 dev_kfree_skb(rx->skb);
771 } /* ieee80211_rx_h_sta_process */
773 static inline struct ieee80211_fragment_entry *
774 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
775 unsigned int frag, unsigned int seq, int rx_queue,
776 struct sk_buff **skb)
778 struct ieee80211_fragment_entry *entry;
781 idx = sdata->fragment_next;
782 entry = &sdata->fragments[sdata->fragment_next++];
783 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
784 sdata->fragment_next = 0;
786 if (!skb_queue_empty(&entry->skb_list)) {
787 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
788 struct ieee80211_hdr *hdr =
789 (struct ieee80211_hdr *) entry->skb_list.next->data;
790 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
791 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
792 "addr1=%pM addr2=%pM\n",
793 sdata->dev->name, idx,
794 jiffies - entry->first_frag_time, entry->seq,
795 entry->last_frag, hdr->addr1, hdr->addr2);
797 __skb_queue_purge(&entry->skb_list);
800 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
802 entry->first_frag_time = jiffies;
804 entry->rx_queue = rx_queue;
805 entry->last_frag = frag;
807 entry->extra_len = 0;
812 static inline struct ieee80211_fragment_entry *
813 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
814 unsigned int frag, unsigned int seq,
815 int rx_queue, struct ieee80211_hdr *hdr)
817 struct ieee80211_fragment_entry *entry;
820 idx = sdata->fragment_next;
821 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
822 struct ieee80211_hdr *f_hdr;
826 idx = IEEE80211_FRAGMENT_MAX - 1;
828 entry = &sdata->fragments[idx];
829 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
830 entry->rx_queue != rx_queue ||
831 entry->last_frag + 1 != frag)
834 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
837 * Check ftype and addresses are equal, else check next fragment
839 if (((hdr->frame_control ^ f_hdr->frame_control) &
840 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
841 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
842 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
845 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
846 __skb_queue_purge(&entry->skb_list);
855 static ieee80211_rx_result debug_noinline
856 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
858 struct ieee80211_hdr *hdr;
861 unsigned int frag, seq;
862 struct ieee80211_fragment_entry *entry;
865 hdr = (struct ieee80211_hdr *)rx->skb->data;
866 fc = hdr->frame_control;
867 sc = le16_to_cpu(hdr->seq_ctrl);
868 frag = sc & IEEE80211_SCTL_FRAG;
870 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
871 (rx->skb)->len < 24 ||
872 is_multicast_ether_addr(hdr->addr1))) {
876 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
878 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
881 /* This is the first fragment of a new frame. */
882 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
883 rx->queue, &(rx->skb));
884 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
885 ieee80211_has_protected(fc)) {
886 /* Store CCMP PN so that we can verify that the next
887 * fragment has a sequential PN value. */
889 memcpy(entry->last_pn,
890 rx->key->u.ccmp.rx_pn[rx->queue],
896 /* This is a fragment for a frame that should already be pending in
897 * fragment cache. Add this fragment to the end of the pending entry.
899 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
901 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
902 return RX_DROP_MONITOR;
905 /* Verify that MPDUs within one MSDU have sequential PN values.
906 * (IEEE 802.11i, 8.3.3.4.5) */
909 u8 pn[CCMP_PN_LEN], *rpn;
910 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
911 return RX_DROP_UNUSABLE;
912 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
913 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
918 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
919 if (memcmp(pn, rpn, CCMP_PN_LEN))
920 return RX_DROP_UNUSABLE;
921 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
924 skb_pull(rx->skb, ieee80211_hdrlen(fc));
925 __skb_queue_tail(&entry->skb_list, rx->skb);
926 entry->last_frag = frag;
927 entry->extra_len += rx->skb->len;
928 if (ieee80211_has_morefrags(fc)) {
933 rx->skb = __skb_dequeue(&entry->skb_list);
934 if (skb_tailroom(rx->skb) < entry->extra_len) {
935 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
936 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
938 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
939 __skb_queue_purge(&entry->skb_list);
940 return RX_DROP_UNUSABLE;
943 while ((skb = __skb_dequeue(&entry->skb_list))) {
944 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
948 /* Complete frame has been reassembled - process it now */
949 rx->flags |= IEEE80211_RX_FRAGMENTED;
953 rx->sta->rx_packets++;
954 if (is_multicast_ether_addr(hdr->addr1))
955 rx->local->dot11MulticastReceivedFrameCount++;
957 ieee80211_led_rx(rx->local);
961 static ieee80211_rx_result debug_noinline
962 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
964 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
967 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
969 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
970 !(rx->flags & IEEE80211_RX_RA_MATCH)))
973 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
974 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
975 return RX_DROP_UNUSABLE;
977 skb = skb_dequeue(&rx->sta->tx_filtered);
979 skb = skb_dequeue(&rx->sta->ps_tx_buf);
981 rx->local->total_ps_buffered--;
983 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
984 skb_queue_empty(&rx->sta->ps_tx_buf);
987 struct ieee80211_hdr *hdr =
988 (struct ieee80211_hdr *) skb->data;
991 * Tell TX path to send one frame even though the STA may
992 * still remain is PS mode after this frame exchange.
994 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
996 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
997 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
998 rx->sta->sta.addr, rx->sta->sta.aid,
999 skb_queue_len(&rx->sta->ps_tx_buf));
1000 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1002 /* Use MoreData flag to indicate whether there are more
1003 * buffered frames for this STA */
1004 if (no_pending_pkts)
1005 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1007 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1009 dev_queue_xmit(skb);
1011 if (no_pending_pkts)
1012 sta_info_clear_tim_bit(rx->sta);
1013 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1014 } else if (!rx->sent_ps_buffered) {
1016 * FIXME: This can be the result of a race condition between
1017 * us expiring a frame and the station polling for it.
1018 * Should we send it a null-func frame indicating we
1019 * have nothing buffered for it?
1021 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1022 "though there are no buffered frames for it\n",
1023 rx->dev->name, rx->sta->sta.addr);
1024 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1027 /* Free PS Poll skb here instead of returning RX_DROP that would
1028 * count as an dropped frame. */
1029 dev_kfree_skb(rx->skb);
1034 static ieee80211_rx_result debug_noinline
1035 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1037 u8 *data = rx->skb->data;
1038 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1040 if (!ieee80211_is_data_qos(hdr->frame_control))
1043 /* remove the qos control field, update frame type and meta-data */
1044 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1045 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1046 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1047 /* change frame type to non QOS */
1048 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1054 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1056 if (unlikely(!rx->sta ||
1057 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1064 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1067 * Pass through unencrypted frames if the hardware has
1068 * decrypted them already.
1070 if (rx->status->flag & RX_FLAG_DECRYPTED)
1073 /* Drop unencrypted frames if key is set. */
1074 if (unlikely(!ieee80211_has_protected(fc) &&
1075 !ieee80211_is_nullfunc(fc) &&
1076 (rx->key || rx->sdata->drop_unencrypted)))
1083 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1085 struct net_device *dev = rx->dev;
1086 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1087 u16 hdrlen, ethertype;
1090 u8 src[ETH_ALEN] __aligned(2);
1091 struct sk_buff *skb = rx->skb;
1092 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1094 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1097 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1099 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1101 * IEEE 802.11 address fields:
1102 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1103 * 0 0 DA SA BSSID n/a
1104 * 0 1 DA BSSID SA n/a
1105 * 1 0 BSSID SA DA n/a
1108 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1109 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
1111 switch (hdr->frame_control &
1112 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1113 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS):
1114 if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP &&
1115 sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1118 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1119 if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS &&
1120 sdata->vif.type != NL80211_IFTYPE_MESH_POINT))
1122 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1123 struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *)
1124 (skb->data + hdrlen);
1125 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
1126 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
1127 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
1128 memcpy(src, meshdr->eaddr2, ETH_ALEN);
1132 case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS):
1133 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1134 (is_multicast_ether_addr(dst) &&
1135 !compare_ether_addr(src, dev->dev_addr)))
1138 case __constant_cpu_to_le16(0):
1139 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1144 if (unlikely(skb->len - hdrlen < 8))
1147 payload = skb->data + hdrlen;
1148 ethertype = (payload[6] << 8) | payload[7];
1150 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1151 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1152 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1153 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1154 * replace EtherType */
1155 skb_pull(skb, hdrlen + 6);
1156 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1157 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1159 struct ethhdr *ehdr;
1162 skb_pull(skb, hdrlen);
1163 len = htons(skb->len);
1164 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1165 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1166 memcpy(ehdr->h_source, src, ETH_ALEN);
1167 ehdr->h_proto = len;
1173 * requires that rx->skb is a frame with ethernet header
1175 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1177 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1178 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1179 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1182 * Allow EAPOL frames to us/the PAE group address regardless
1183 * of whether the frame was encrypted or not.
1185 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1186 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1187 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1190 if (ieee80211_802_1x_port_control(rx) ||
1191 ieee80211_drop_unencrypted(rx, fc))
1198 * requires that rx->skb is a frame with ethernet header
1201 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1203 struct net_device *dev = rx->dev;
1204 struct ieee80211_local *local = rx->local;
1205 struct sk_buff *skb, *xmit_skb;
1206 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1207 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1208 struct sta_info *dsta;
1213 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1214 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1215 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1216 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1217 if (is_multicast_ether_addr(ehdr->h_dest)) {
1219 * send multicast frames both to higher layers in
1220 * local net stack and back to the wireless medium
1222 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1223 if (!xmit_skb && net_ratelimit())
1224 printk(KERN_DEBUG "%s: failed to clone "
1225 "multicast frame\n", dev->name);
1227 dsta = sta_info_get(local, skb->data);
1228 if (dsta && dsta->sdata->dev == dev) {
1230 * The destination station is associated to
1231 * this AP (in this VLAN), so send the frame
1232 * directly to it and do not pass it to local
1242 /* deliver to local stack */
1243 skb->protocol = eth_type_trans(skb, dev);
1244 memset(skb->cb, 0, sizeof(skb->cb));
1249 /* send to wireless media */
1250 xmit_skb->protocol = htons(ETH_P_802_3);
1251 skb_reset_network_header(xmit_skb);
1252 skb_reset_mac_header(xmit_skb);
1253 dev_queue_xmit(xmit_skb);
1257 static ieee80211_rx_result debug_noinline
1258 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1260 struct net_device *dev = rx->dev;
1261 struct ieee80211_local *local = rx->local;
1264 struct sk_buff *skb = rx->skb, *frame = NULL;
1265 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1266 __le16 fc = hdr->frame_control;
1267 const struct ethhdr *eth;
1272 if (unlikely(!ieee80211_is_data(fc)))
1275 if (unlikely(!ieee80211_is_data_present(fc)))
1276 return RX_DROP_MONITOR;
1278 if (!(rx->flags & IEEE80211_RX_AMSDU))
1281 err = ieee80211_data_to_8023(rx);
1283 return RX_DROP_UNUSABLE;
1287 dev->stats.rx_packets++;
1288 dev->stats.rx_bytes += skb->len;
1290 /* skip the wrapping header */
1291 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1293 return RX_DROP_UNUSABLE;
1295 while (skb != frame) {
1297 __be16 len = eth->h_proto;
1298 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1300 remaining = skb->len;
1301 memcpy(dst, eth->h_dest, ETH_ALEN);
1302 memcpy(src, eth->h_source, ETH_ALEN);
1304 padding = ((4 - subframe_len) & 0x3);
1305 /* the last MSDU has no padding */
1306 if (subframe_len > remaining)
1307 return RX_DROP_UNUSABLE;
1309 skb_pull(skb, sizeof(struct ethhdr));
1310 /* if last subframe reuse skb */
1311 if (remaining <= subframe_len + padding)
1314 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1318 return RX_DROP_UNUSABLE;
1320 skb_reserve(frame, local->hw.extra_tx_headroom +
1321 sizeof(struct ethhdr));
1322 memcpy(skb_put(frame, ntohs(len)), skb->data,
1325 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1328 dev_kfree_skb(frame);
1329 return RX_DROP_UNUSABLE;
1333 skb_reset_network_header(frame);
1335 frame->priority = skb->priority;
1338 payload = frame->data;
1339 ethertype = (payload[6] << 8) | payload[7];
1341 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1342 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1343 compare_ether_addr(payload,
1344 bridge_tunnel_header) == 0)) {
1345 /* remove RFC1042 or Bridge-Tunnel
1346 * encapsulation and replace EtherType */
1348 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1349 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1351 memcpy(skb_push(frame, sizeof(__be16)),
1352 &len, sizeof(__be16));
1353 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1354 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1357 if (!ieee80211_frame_allowed(rx, fc)) {
1358 if (skb == frame) /* last frame */
1359 return RX_DROP_UNUSABLE;
1360 dev_kfree_skb(frame);
1364 ieee80211_deliver_skb(rx);
1370 #ifdef CONFIG_MAC80211_MESH
1371 static ieee80211_rx_result
1372 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1374 struct ieee80211_hdr *hdr;
1375 struct ieee80211s_hdr *mesh_hdr;
1376 unsigned int hdrlen;
1377 struct sk_buff *skb = rx->skb, *fwd_skb;
1379 hdr = (struct ieee80211_hdr *) skb->data;
1380 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1381 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1383 if (!ieee80211_is_data(hdr->frame_control))
1388 return RX_DROP_MONITOR;
1390 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1391 struct ieee80211_sub_if_data *sdata;
1392 struct mesh_path *mppath;
1394 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1396 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1398 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1400 spin_lock_bh(&mppath->state_lock);
1401 mppath->exp_time = jiffies;
1402 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1403 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1404 spin_unlock_bh(&mppath->state_lock);
1409 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1414 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1416 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1417 dropped_frames_ttl);
1419 struct ieee80211_hdr *fwd_hdr;
1420 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1422 if (!fwd_skb && net_ratelimit())
1423 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1426 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1428 * Save TA to addr1 to send TA a path error if a
1429 * suitable next hop is not found
1431 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1432 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1433 fwd_skb->dev = rx->local->mdev;
1434 fwd_skb->iif = rx->dev->ifindex;
1435 dev_queue_xmit(fwd_skb);
1439 if (is_multicast_ether_addr(hdr->addr3) ||
1440 rx->dev->flags & IFF_PROMISC)
1443 return RX_DROP_MONITOR;
1447 static ieee80211_rx_result debug_noinline
1448 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1450 struct net_device *dev = rx->dev;
1451 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1452 __le16 fc = hdr->frame_control;
1455 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1458 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1459 return RX_DROP_MONITOR;
1461 err = ieee80211_data_to_8023(rx);
1463 return RX_DROP_UNUSABLE;
1465 if (!ieee80211_frame_allowed(rx, fc))
1466 return RX_DROP_MONITOR;
1470 dev->stats.rx_packets++;
1471 dev->stats.rx_bytes += rx->skb->len;
1473 ieee80211_deliver_skb(rx);
1478 static ieee80211_rx_result debug_noinline
1479 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1481 struct ieee80211_local *local = rx->local;
1482 struct ieee80211_hw *hw = &local->hw;
1483 struct sk_buff *skb = rx->skb;
1484 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1485 struct tid_ampdu_rx *tid_agg_rx;
1489 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1492 if (ieee80211_is_back_req(bar->frame_control)) {
1495 tid = le16_to_cpu(bar->control) >> 12;
1496 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1497 != HT_AGG_STATE_OPERATIONAL)
1499 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1501 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1503 /* reset session timer */
1504 if (tid_agg_rx->timeout) {
1505 unsigned long expires =
1506 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1507 mod_timer(&tid_agg_rx->session_timer, expires);
1510 /* manage reordering buffer according to requested */
1511 /* sequence number */
1513 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1516 return RX_DROP_UNUSABLE;
1522 static ieee80211_rx_result debug_noinline
1523 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1525 struct ieee80211_local *local = rx->local;
1526 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1527 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1528 int len = rx->skb->len;
1530 if (!ieee80211_is_action(mgmt->frame_control))
1534 return RX_DROP_MONITOR;
1536 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1537 return RX_DROP_MONITOR;
1539 /* all categories we currently handle have action_code */
1540 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1541 return RX_DROP_MONITOR;
1544 * FIXME: revisit this, I'm sure we should handle most
1545 * of these frames in other modes as well!
1547 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1548 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1551 switch (mgmt->u.action.category) {
1552 case WLAN_CATEGORY_BACK:
1553 switch (mgmt->u.action.u.addba_req.action_code) {
1554 case WLAN_ACTION_ADDBA_REQ:
1555 if (len < (IEEE80211_MIN_ACTION_SIZE +
1556 sizeof(mgmt->u.action.u.addba_req)))
1557 return RX_DROP_MONITOR;
1558 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1560 case WLAN_ACTION_ADDBA_RESP:
1561 if (len < (IEEE80211_MIN_ACTION_SIZE +
1562 sizeof(mgmt->u.action.u.addba_resp)))
1563 return RX_DROP_MONITOR;
1564 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1566 case WLAN_ACTION_DELBA:
1567 if (len < (IEEE80211_MIN_ACTION_SIZE +
1568 sizeof(mgmt->u.action.u.delba)))
1569 return RX_DROP_MONITOR;
1570 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1574 case WLAN_CATEGORY_SPECTRUM_MGMT:
1575 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1576 return RX_DROP_MONITOR;
1577 switch (mgmt->u.action.u.measurement.action_code) {
1578 case WLAN_ACTION_SPCT_MSR_REQ:
1579 if (len < (IEEE80211_MIN_ACTION_SIZE +
1580 sizeof(mgmt->u.action.u.measurement)))
1581 return RX_DROP_MONITOR;
1582 ieee80211_process_measurement_req(sdata, mgmt, len);
1590 rx->sta->rx_packets++;
1591 dev_kfree_skb(rx->skb);
1595 static ieee80211_rx_result debug_noinline
1596 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1598 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1600 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1601 return RX_DROP_MONITOR;
1603 if (ieee80211_vif_is_mesh(&sdata->vif))
1604 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1606 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1607 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1608 return RX_DROP_MONITOR;
1610 if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)
1611 return RX_DROP_MONITOR;
1613 ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
1617 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1618 struct ieee80211_hdr *hdr,
1619 struct ieee80211_rx_data *rx)
1622 unsigned int hdrlen;
1624 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1625 if (rx->skb->len >= hdrlen + 4)
1626 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1632 * Some hardware seem to generate incorrect Michael MIC
1633 * reports; ignore them to avoid triggering countermeasures.
1638 if (!ieee80211_has_protected(hdr->frame_control))
1641 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1643 * APs with pairwise keys should never receive Michael MIC
1644 * errors for non-zero keyidx because these are reserved for
1645 * group keys and only the AP is sending real multicast
1646 * frames in the BSS.
1651 if (!ieee80211_is_data(hdr->frame_control) &&
1652 !ieee80211_is_auth(hdr->frame_control))
1655 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
1657 dev_kfree_skb(rx->skb);
1661 /* TODO: use IEEE80211_RX_FRAGMENTED */
1662 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1664 struct ieee80211_sub_if_data *sdata;
1665 struct ieee80211_local *local = rx->local;
1666 struct ieee80211_rtap_hdr {
1667 struct ieee80211_radiotap_header hdr;
1672 } __attribute__ ((packed)) *rthdr;
1673 struct sk_buff *skb = rx->skb, *skb2;
1674 struct net_device *prev_dev = NULL;
1675 struct ieee80211_rx_status *status = rx->status;
1677 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1680 if (skb_headroom(skb) < sizeof(*rthdr) &&
1681 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1684 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1685 memset(rthdr, 0, sizeof(*rthdr));
1686 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1687 rthdr->hdr.it_present =
1688 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1689 (1 << IEEE80211_RADIOTAP_RATE) |
1690 (1 << IEEE80211_RADIOTAP_CHANNEL));
1692 rthdr->rate = rx->rate->bitrate / 5;
1693 rthdr->chan_freq = cpu_to_le16(status->freq);
1695 if (status->band == IEEE80211_BAND_5GHZ)
1696 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1697 IEEE80211_CHAN_5GHZ);
1699 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1700 IEEE80211_CHAN_2GHZ);
1702 skb_set_mac_header(skb, 0);
1703 skb->ip_summed = CHECKSUM_UNNECESSARY;
1704 skb->pkt_type = PACKET_OTHERHOST;
1705 skb->protocol = htons(ETH_P_802_2);
1707 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1708 if (!netif_running(sdata->dev))
1711 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1712 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1716 skb2 = skb_clone(skb, GFP_ATOMIC);
1718 skb2->dev = prev_dev;
1723 prev_dev = sdata->dev;
1724 sdata->dev->stats.rx_packets++;
1725 sdata->dev->stats.rx_bytes += skb->len;
1729 skb->dev = prev_dev;
1735 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1743 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1744 struct ieee80211_rx_data *rx,
1745 struct sk_buff *skb)
1747 ieee80211_rx_result res = RX_DROP_MONITOR;
1751 rx->dev = sdata->dev;
1753 #define CALL_RXH(rxh) \
1756 if (res != RX_CONTINUE) \
1760 CALL_RXH(ieee80211_rx_h_passive_scan)
1761 CALL_RXH(ieee80211_rx_h_check)
1762 CALL_RXH(ieee80211_rx_h_decrypt)
1763 CALL_RXH(ieee80211_rx_h_sta_process)
1764 CALL_RXH(ieee80211_rx_h_defragment)
1765 CALL_RXH(ieee80211_rx_h_ps_poll)
1766 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1767 /* must be after MMIC verify so header is counted in MPDU mic */
1768 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1769 CALL_RXH(ieee80211_rx_h_amsdu)
1770 #ifdef CONFIG_MAC80211_MESH
1771 if (ieee80211_vif_is_mesh(&sdata->vif))
1772 CALL_RXH(ieee80211_rx_h_mesh_fwding);
1774 CALL_RXH(ieee80211_rx_h_data)
1775 CALL_RXH(ieee80211_rx_h_ctrl)
1776 CALL_RXH(ieee80211_rx_h_action)
1777 CALL_RXH(ieee80211_rx_h_mgmt)
1783 case RX_DROP_MONITOR:
1784 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1786 rx->sta->rx_dropped++;
1789 ieee80211_rx_cooked_monitor(rx);
1791 case RX_DROP_UNUSABLE:
1792 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1794 rx->sta->rx_dropped++;
1795 dev_kfree_skb(rx->skb);
1798 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1803 /* main receive path */
1805 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1806 u8 *bssid, struct ieee80211_rx_data *rx,
1807 struct ieee80211_hdr *hdr)
1809 int multicast = is_multicast_ether_addr(hdr->addr1);
1811 switch (sdata->vif.type) {
1812 case NL80211_IFTYPE_STATION:
1815 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1816 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1818 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1819 } else if (!multicast &&
1820 compare_ether_addr(sdata->dev->dev_addr,
1822 if (!(sdata->dev->flags & IFF_PROMISC))
1824 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1827 case NL80211_IFTYPE_ADHOC:
1830 if (ieee80211_is_beacon(hdr->frame_control)) {
1833 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1834 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1836 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1837 } else if (!multicast &&
1838 compare_ether_addr(sdata->dev->dev_addr,
1840 if (!(sdata->dev->flags & IFF_PROMISC))
1842 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1843 } else if (!rx->sta)
1844 rx->sta = ieee80211_ibss_add_sta(sdata, rx->skb,
1846 BIT(rx->status->rate_idx));
1848 case NL80211_IFTYPE_MESH_POINT:
1850 compare_ether_addr(sdata->dev->dev_addr,
1852 if (!(sdata->dev->flags & IFF_PROMISC))
1855 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1858 case NL80211_IFTYPE_AP_VLAN:
1859 case NL80211_IFTYPE_AP:
1861 if (compare_ether_addr(sdata->dev->dev_addr,
1864 } else if (!ieee80211_bssid_match(bssid,
1865 sdata->dev->dev_addr)) {
1866 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1868 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1871 case NL80211_IFTYPE_WDS:
1872 if (bssid || !ieee80211_is_data(hdr->frame_control))
1874 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1877 case NL80211_IFTYPE_MONITOR:
1878 /* take everything */
1880 case NL80211_IFTYPE_UNSPECIFIED:
1881 case __NL80211_IFTYPE_AFTER_LAST:
1882 /* should never get here */
1891 * This is the actual Rx frames handler. as it blongs to Rx path it must
1892 * be called with rcu_read_lock protection.
1894 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1895 struct sk_buff *skb,
1896 struct ieee80211_rx_status *status,
1897 struct ieee80211_rate *rate)
1899 struct ieee80211_local *local = hw_to_local(hw);
1900 struct ieee80211_sub_if_data *sdata;
1901 struct ieee80211_hdr *hdr;
1902 struct ieee80211_rx_data rx;
1904 struct ieee80211_sub_if_data *prev = NULL;
1905 struct sk_buff *skb_new;
1908 hdr = (struct ieee80211_hdr *)skb->data;
1909 memset(&rx, 0, sizeof(rx));
1916 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
1917 local->dot11ReceivedFragmentCount++;
1919 rx.sta = sta_info_get(local, hdr->addr2);
1921 rx.sdata = rx.sta->sdata;
1922 rx.dev = rx.sta->sdata->dev;
1925 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1926 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1930 if (unlikely(local->sw_scanning || local->hw_scanning))
1931 rx.flags |= IEEE80211_RX_IN_SCAN;
1933 ieee80211_parse_qos(&rx);
1934 ieee80211_verify_ip_alignment(&rx);
1938 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1939 if (!netif_running(sdata->dev))
1942 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1945 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1946 rx.flags |= IEEE80211_RX_RA_MATCH;
1947 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1953 * frame is destined for this interface, but if it's not
1954 * also for the previous one we handle that after the
1955 * loop to avoid copying the SKB once too much
1964 * frame was destined for the previous interface
1965 * so invoke RX handlers for it
1968 skb_new = skb_copy(skb, GFP_ATOMIC);
1970 if (net_ratelimit())
1971 printk(KERN_DEBUG "%s: failed to copy "
1972 "multicast frame for %s\n",
1973 wiphy_name(local->hw.wiphy),
1977 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
1981 ieee80211_invoke_rx_handlers(prev, &rx, skb);
1986 #define SEQ_MODULO 0x1000
1987 #define SEQ_MASK 0xfff
1989 static inline int seq_less(u16 sq1, u16 sq2)
1991 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1994 static inline u16 seq_inc(u16 sq)
1996 return ((sq + 1) & SEQ_MASK);
1999 static inline u16 seq_sub(u16 sq1, u16 sq2)
2001 return ((sq1 - sq2) & SEQ_MASK);
2006 * As it function blongs to Rx path it must be called with
2007 * the proper rcu_read_lock protection for its flow.
2009 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2010 struct tid_ampdu_rx *tid_agg_rx,
2011 struct sk_buff *skb, u16 mpdu_seq_num,
2014 struct ieee80211_local *local = hw_to_local(hw);
2015 struct ieee80211_rx_status status;
2016 u16 head_seq_num, buf_size;
2018 struct ieee80211_supported_band *sband;
2019 struct ieee80211_rate *rate;
2021 buf_size = tid_agg_rx->buf_size;
2022 head_seq_num = tid_agg_rx->head_seq_num;
2024 /* frame with out of date sequence number */
2025 if (seq_less(mpdu_seq_num, head_seq_num)) {
2030 /* if frame sequence number exceeds our buffering window size or
2031 * block Ack Request arrived - release stored frames */
2032 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2033 /* new head to the ordering buffer */
2035 head_seq_num = mpdu_seq_num;
2038 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2039 /* release stored frames up to new head to stack */
2040 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2041 index = seq_sub(tid_agg_rx->head_seq_num,
2043 % tid_agg_rx->buf_size;
2045 if (tid_agg_rx->reorder_buf[index]) {
2046 /* release the reordered frames to stack */
2048 tid_agg_rx->reorder_buf[index]->cb,
2050 sband = local->hw.wiphy->bands[status.band];
2051 rate = &sband->bitrates[status.rate_idx];
2052 __ieee80211_rx_handle_packet(hw,
2053 tid_agg_rx->reorder_buf[index],
2055 tid_agg_rx->stored_mpdu_num--;
2056 tid_agg_rx->reorder_buf[index] = NULL;
2058 tid_agg_rx->head_seq_num =
2059 seq_inc(tid_agg_rx->head_seq_num);
2065 /* now the new frame is always in the range of the reordering */
2067 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2068 % tid_agg_rx->buf_size;
2069 /* check if we already stored this frame */
2070 if (tid_agg_rx->reorder_buf[index]) {
2075 /* if arrived mpdu is in the right order and nothing else stored */
2076 /* release it immediately */
2077 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2078 tid_agg_rx->stored_mpdu_num == 0) {
2079 tid_agg_rx->head_seq_num =
2080 seq_inc(tid_agg_rx->head_seq_num);
2084 /* put the frame in the reordering buffer */
2085 tid_agg_rx->reorder_buf[index] = skb;
2086 tid_agg_rx->stored_mpdu_num++;
2087 /* release the buffer until next missing frame */
2088 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2089 % tid_agg_rx->buf_size;
2090 while (tid_agg_rx->reorder_buf[index]) {
2091 /* release the reordered frame back to stack */
2092 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2094 sband = local->hw.wiphy->bands[status.band];
2095 rate = &sband->bitrates[status.rate_idx];
2096 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2098 tid_agg_rx->stored_mpdu_num--;
2099 tid_agg_rx->reorder_buf[index] = NULL;
2100 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2101 index = seq_sub(tid_agg_rx->head_seq_num,
2102 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2107 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2108 struct sk_buff *skb)
2110 struct ieee80211_hw *hw = &local->hw;
2111 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2112 struct sta_info *sta;
2113 struct tid_ampdu_rx *tid_agg_rx;
2119 sta = sta_info_get(local, hdr->addr2);
2123 /* filter the QoS data rx stream according to
2124 * STA/TID and check if this STA/TID is on aggregation */
2125 if (!ieee80211_is_data_qos(hdr->frame_control))
2128 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2130 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2133 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2135 /* qos null data frames are excluded */
2136 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2139 /* new un-ordered ampdu frame - process it */
2141 /* reset session timer */
2142 if (tid_agg_rx->timeout) {
2143 unsigned long expires =
2144 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2145 mod_timer(&tid_agg_rx->session_timer, expires);
2148 /* if this mpdu is fragmented - terminate rx aggregation session */
2149 sc = le16_to_cpu(hdr->seq_ctrl);
2150 if (sc & IEEE80211_SCTL_FRAG) {
2151 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2152 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2157 /* according to mpdu sequence number deal with reordering buffer */
2158 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2159 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2166 * This is the receive path handler. It is called by a low level driver when an
2167 * 802.11 MPDU is received from the hardware.
2169 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2170 struct ieee80211_rx_status *status)
2172 struct ieee80211_local *local = hw_to_local(hw);
2173 struct ieee80211_rate *rate = NULL;
2174 struct ieee80211_supported_band *sband;
2176 if (status->band < 0 ||
2177 status->band >= IEEE80211_NUM_BANDS) {
2182 sband = local->hw.wiphy->bands[status->band];
2185 status->rate_idx < 0 ||
2186 status->rate_idx >= sband->n_bitrates) {
2191 rate = &sband->bitrates[status->rate_idx];
2194 * key references and virtual interfaces are protected using RCU
2195 * and this requires that we are in a read-side RCU section during
2196 * receive processing
2201 * Frames with failed FCS/PLCP checksum are not returned,
2202 * all other frames are returned without radiotap header
2203 * if it was previously present.
2204 * Also, frames with less than 16 bytes are dropped.
2206 skb = ieee80211_rx_monitor(local, skb, status, rate);
2212 if (!ieee80211_rx_reorder_ampdu(local, skb))
2213 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2217 EXPORT_SYMBOL(__ieee80211_rx);
2219 /* This is a version of the rx handler that can be called from hard irq
2220 * context. Post the skb on the queue and schedule the tasklet */
2221 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2222 struct ieee80211_rx_status *status)
2224 struct ieee80211_local *local = hw_to_local(hw);
2226 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2228 skb->dev = local->mdev;
2229 /* copy status into skb->cb for use by tasklet */
2230 memcpy(skb->cb, status, sizeof(*status));
2231 skb->pkt_type = IEEE80211_RX_MSG;
2232 skb_queue_tail(&local->skb_queue, skb);
2233 tasklet_schedule(&local->tasklet);
2235 EXPORT_SYMBOL(ieee80211_rx_irqsafe);