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);
161 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN |
162 IEEE80211_CHAN_2GHZ);
165 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
166 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
167 *pos = status->signal;
169 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
173 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
174 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
175 *pos = status->noise;
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
181 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
183 /* IEEE80211_RADIOTAP_ANTENNA */
184 *pos = status->antenna;
187 /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
188 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
189 *pos = status->signal;
191 cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
195 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
197 /* IEEE80211_RADIOTAP_RX_FLAGS */
198 /* ensure 2 byte alignment for the 2 byte field as required */
199 if ((pos - (unsigned char *)rthdr) & 1)
201 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
202 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
203 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
208 * This function copies a received frame to all monitor interfaces and
209 * returns a cleaned-up SKB that no longer includes the FCS nor the
210 * radiotap header the driver might have added.
212 static struct sk_buff *
213 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
214 struct ieee80211_rx_status *status,
215 struct ieee80211_rate *rate)
217 struct ieee80211_sub_if_data *sdata;
218 int needed_headroom = 0;
219 struct sk_buff *skb, *skb2;
220 struct net_device *prev_dev = NULL;
221 int present_fcs_len = 0;
225 * First, we may need to make a copy of the skb because
226 * (1) we need to modify it for radiotap (if not present), and
227 * (2) the other RX handlers will modify the skb we got.
229 * We don't need to, of course, if we aren't going to return
230 * the SKB because it has a bad FCS/PLCP checksum.
232 if (status->flag & RX_FLAG_RADIOTAP)
233 rtap_len = ieee80211_get_radiotap_len(origskb->data);
235 /* room for the radiotap header based on driver features */
236 needed_headroom = ieee80211_rx_radiotap_len(local, status);
238 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
239 present_fcs_len = FCS_LEN;
241 if (!local->monitors) {
242 if (should_drop_frame(status, origskb, present_fcs_len,
244 dev_kfree_skb(origskb);
248 return remove_monitor_info(local, origskb, rtap_len);
251 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
252 /* only need to expand headroom if necessary */
257 * This shouldn't trigger often because most devices have an
258 * RX header they pull before we get here, and that should
259 * be big enough for our radiotap information. We should
260 * probably export the length to drivers so that we can have
261 * them allocate enough headroom to start with.
263 if (skb_headroom(skb) < needed_headroom &&
264 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
270 * Need to make a copy and possibly remove radiotap header
271 * and FCS from the original.
273 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
275 origskb = remove_monitor_info(local, origskb, rtap_len);
281 /* if necessary, prepend radiotap information */
282 if (!(status->flag & RX_FLAG_RADIOTAP))
283 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
286 skb_reset_mac_header(skb);
287 skb->ip_summed = CHECKSUM_UNNECESSARY;
288 skb->pkt_type = PACKET_OTHERHOST;
289 skb->protocol = htons(ETH_P_802_2);
291 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
292 if (!netif_running(sdata->dev))
295 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
298 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
302 skb2 = skb_clone(skb, GFP_ATOMIC);
304 skb2->dev = prev_dev;
309 prev_dev = sdata->dev;
310 sdata->dev->stats.rx_packets++;
311 sdata->dev->stats.rx_bytes += skb->len;
324 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
326 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
329 /* does the frame have a qos control field? */
330 if (ieee80211_is_data_qos(hdr->frame_control)) {
331 u8 *qc = ieee80211_get_qos_ctl(hdr);
332 /* frame has qos control */
333 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
334 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
335 rx->flags |= IEEE80211_RX_AMSDU;
337 rx->flags &= ~IEEE80211_RX_AMSDU;
340 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
342 * Sequence numbers for management frames, QoS data
343 * frames with a broadcast/multicast address in the
344 * Address 1 field, and all non-QoS data frames sent
345 * by QoS STAs are assigned using an additional single
346 * modulo-4096 counter, [...]
348 * We also use that counter for non-QoS STAs.
350 tid = NUM_RX_DATA_QUEUES - 1;
354 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
355 * For now, set skb->priority to 0 for other cases. */
356 rx->skb->priority = (tid > 7) ? 0 : tid;
359 static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
361 #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
362 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
365 if (!ieee80211_is_data_present(hdr->frame_control))
369 * Drivers are required to align the payload data in a way that
370 * guarantees that the contained IP header is aligned to a four-
371 * byte boundary. In the case of regular frames, this simply means
372 * aligning the payload to a four-byte boundary (because either
373 * the IP header is directly contained, or IV/RFC1042 headers that
374 * have a length divisible by four are in front of it.
376 * With A-MSDU frames, however, the payload data address must
377 * yield two modulo four because there are 14-byte 802.3 headers
378 * within the A-MSDU frames that push the IP header further back
379 * to a multiple of four again. Thankfully, the specs were sane
380 * enough this time around to require padding each A-MSDU subframe
381 * to a length that is a multiple of four.
383 * Padding like atheros hardware adds which is inbetween the 802.11
384 * header and the payload is not supported, the driver is required
385 * to move the 802.11 header further back in that case.
387 hdrlen = ieee80211_hdrlen(hdr->frame_control);
388 if (rx->flags & IEEE80211_RX_AMSDU)
390 WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
397 static ieee80211_rx_result debug_noinline
398 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
400 struct ieee80211_local *local = rx->local;
401 struct sk_buff *skb = rx->skb;
403 if (unlikely(local->sta_hw_scanning))
404 return ieee80211_sta_rx_scan(rx->dev, skb, rx->status);
406 if (unlikely(local->sta_sw_scanning)) {
407 /* drop all the other packets during a software scan anyway */
408 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status)
414 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
415 /* scanning finished during invoking of handlers */
416 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
417 return RX_DROP_UNUSABLE;
423 static ieee80211_rx_result
424 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
426 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
427 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
429 if (ieee80211_is_data(hdr->frame_control)) {
430 if (!ieee80211_has_a4(hdr->frame_control))
431 return RX_DROP_MONITOR;
432 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
433 return RX_DROP_MONITOR;
436 /* If there is not an established peer link and this is not a peer link
437 * establisment frame, beacon or probe, drop the frame.
440 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
441 struct ieee80211_mgmt *mgmt;
443 if (!ieee80211_is_mgmt(hdr->frame_control))
444 return RX_DROP_MONITOR;
446 if (ieee80211_is_action(hdr->frame_control)) {
447 mgmt = (struct ieee80211_mgmt *)hdr;
448 if (mgmt->u.action.category != PLINK_CATEGORY)
449 return RX_DROP_MONITOR;
453 if (ieee80211_is_probe_req(hdr->frame_control) ||
454 ieee80211_is_probe_resp(hdr->frame_control) ||
455 ieee80211_is_beacon(hdr->frame_control))
458 return RX_DROP_MONITOR;
462 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
464 if (ieee80211_is_data(hdr->frame_control) &&
465 is_multicast_ether_addr(hdr->addr1) &&
466 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev))
467 return RX_DROP_MONITOR;
474 static ieee80211_rx_result debug_noinline
475 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
477 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
479 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
480 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
481 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
482 rx->sta->last_seq_ctrl[rx->queue] ==
484 if (rx->flags & IEEE80211_RX_RA_MATCH) {
485 rx->local->dot11FrameDuplicateCount++;
486 rx->sta->num_duplicates++;
488 return RX_DROP_MONITOR;
490 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
493 if (unlikely(rx->skb->len < 16)) {
494 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
495 return RX_DROP_MONITOR;
498 /* Drop disallowed frame classes based on STA auth/assoc state;
499 * IEEE 802.11, Chap 5.5.
501 * 80211.o does filtering only based on association state, i.e., it
502 * drops Class 3 frames from not associated stations. hostapd sends
503 * deauth/disassoc frames when needed. In addition, hostapd is
504 * responsible for filtering on both auth and assoc states.
507 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
508 return ieee80211_rx_mesh_check(rx);
510 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
511 ieee80211_is_pspoll(hdr->frame_control)) &&
512 rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
513 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
514 if ((!ieee80211_has_fromds(hdr->frame_control) &&
515 !ieee80211_has_tods(hdr->frame_control) &&
516 ieee80211_is_data(hdr->frame_control)) ||
517 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
518 /* Drop IBSS frames and frames for other hosts
520 return RX_DROP_MONITOR;
523 return RX_DROP_MONITOR;
530 static ieee80211_rx_result debug_noinline
531 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
533 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
536 ieee80211_rx_result result = RX_DROP_UNUSABLE;
537 struct ieee80211_key *stakey = NULL;
542 * There are three types of keys:
544 * - PTK (pairwise keys)
545 * - STK (station-to-station pairwise keys)
547 * When selecting a key, we have to distinguish between multicast
548 * (including broadcast) and unicast frames, the latter can only
549 * use PTKs and STKs while the former always use GTKs. Unless, of
550 * course, actual WEP keys ("pre-RSNA") are used, then unicast
551 * frames can also use key indizes like GTKs. Hence, if we don't
552 * have a PTK/STK we check the key index for a WEP key.
554 * Note that in a regular BSS, multicast frames are sent by the
555 * AP only, associated stations unicast the frame to the AP first
556 * which then multicasts it on their behalf.
558 * There is also a slight problem in IBSS mode: GTKs are negotiated
559 * with each station, that is something we don't currently handle.
560 * The spec seems to expect that one negotiates the same key with
561 * every station but there's no such requirement; VLANs could be
565 if (!ieee80211_has_protected(hdr->frame_control))
569 * No point in finding a key and decrypting if the frame is neither
570 * addressed to us nor a multicast frame.
572 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
576 stakey = rcu_dereference(rx->sta->key);
578 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
582 * The device doesn't give us the IV so we won't be
583 * able to look up the key. That's ok though, we
584 * don't need to decrypt the frame, we just won't
585 * be able to keep statistics accurate.
586 * Except for key threshold notifications, should
587 * we somehow allow the driver to tell us which key
588 * the hardware used if this flag is set?
590 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
591 (rx->status->flag & RX_FLAG_IV_STRIPPED))
594 hdrlen = ieee80211_hdrlen(hdr->frame_control);
596 if (rx->skb->len < 8 + hdrlen)
597 return RX_DROP_UNUSABLE; /* TODO: count this? */
600 * no need to call ieee80211_wep_get_keyidx,
601 * it verifies a bunch of things we've done already
603 keyidx = rx->skb->data[hdrlen + 3] >> 6;
605 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
608 * RSNA-protected unicast frames should always be sent with
609 * pairwise or station-to-station keys, but for WEP we allow
610 * using a key index as well.
612 if (rx->key && rx->key->conf.alg != ALG_WEP &&
613 !is_multicast_ether_addr(hdr->addr1))
618 rx->key->tx_rx_count++;
619 /* TODO: add threshold stuff again */
621 return RX_DROP_MONITOR;
624 /* Check for weak IVs if possible */
625 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
626 ieee80211_is_data(hdr->frame_control) &&
627 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
628 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
629 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
630 rx->sta->wep_weak_iv_count++;
632 switch (rx->key->conf.alg) {
634 result = ieee80211_crypto_wep_decrypt(rx);
637 result = ieee80211_crypto_tkip_decrypt(rx);
640 result = ieee80211_crypto_ccmp_decrypt(rx);
644 /* either the frame has been decrypted or will be dropped */
645 rx->status->flag |= RX_FLAG_DECRYPTED;
650 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
652 struct ieee80211_sub_if_data *sdata;
653 DECLARE_MAC_BUF(mac);
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 %s aid %d enters power save mode\n",
661 dev->name, print_mac(mac, sta->addr), sta->aid);
662 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
665 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
667 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
670 struct ieee80211_sub_if_data *sdata;
671 struct ieee80211_tx_info *info;
672 DECLARE_MAC_BUF(mac);
676 atomic_dec(&sdata->bss->num_sta_ps);
678 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
680 if (!skb_queue_empty(&sta->ps_tx_buf))
681 sta_info_clear_tim_bit(sta);
683 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
684 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
685 dev->name, print_mac(mac, sta->addr), sta->aid);
686 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
688 /* Send all buffered frames to the station */
689 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
690 info = IEEE80211_SKB_CB(skb);
692 info->flags |= IEEE80211_TX_CTL_REQUEUE;
695 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
696 info = IEEE80211_SKB_CB(skb);
697 local->total_ps_buffered--;
699 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
700 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
701 "since STA not sleeping anymore\n", dev->name,
702 print_mac(mac, sta->addr), sta->aid);
703 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
704 info->flags |= IEEE80211_TX_CTL_REQUEUE;
711 static ieee80211_rx_result debug_noinline
712 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
714 struct sta_info *sta = rx->sta;
715 struct net_device *dev = rx->dev;
716 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
721 /* Update last_rx only for IBSS packets which are for the current
722 * BSSID to avoid keeping the current IBSS network alive in cases where
723 * other STAs are using different BSSID. */
724 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
725 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
726 IEEE80211_IF_TYPE_IBSS);
727 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
728 sta->last_rx = jiffies;
730 if (!is_multicast_ether_addr(hdr->addr1) ||
731 rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
732 /* Update last_rx only for unicast frames in order to prevent
733 * the Probe Request frames (the only broadcast frames from a
734 * STA in infrastructure mode) from keeping a connection alive.
735 * Mesh beacons will update last_rx when if they are found to
736 * match the current local configuration when processed.
738 sta->last_rx = jiffies;
741 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
745 sta->rx_bytes += rx->skb->len;
746 sta->last_signal = rx->status->signal;
747 sta->last_qual = rx->status->qual;
748 sta->last_noise = rx->status->noise;
750 if (!ieee80211_has_morefrags(hdr->frame_control) &&
751 (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP ||
752 rx->sdata->vif.type == IEEE80211_IF_TYPE_VLAN)) {
753 /* Change STA power saving mode only in the end of a frame
754 * exchange sequence */
755 if (test_sta_flags(sta, WLAN_STA_PS) &&
756 !ieee80211_has_pm(hdr->frame_control))
757 rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
758 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
759 ieee80211_has_pm(hdr->frame_control))
760 ap_sta_ps_start(dev, sta);
763 /* Drop data::nullfunc frames silently, since they are used only to
764 * control station power saving mode. */
765 if (ieee80211_is_nullfunc(hdr->frame_control)) {
766 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
767 /* Update counter and free packet here to avoid counting this
768 * as a dropped packed. */
770 dev_kfree_skb(rx->skb);
775 } /* ieee80211_rx_h_sta_process */
777 static inline struct ieee80211_fragment_entry *
778 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
779 unsigned int frag, unsigned int seq, int rx_queue,
780 struct sk_buff **skb)
782 struct ieee80211_fragment_entry *entry;
785 idx = sdata->fragment_next;
786 entry = &sdata->fragments[sdata->fragment_next++];
787 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
788 sdata->fragment_next = 0;
790 if (!skb_queue_empty(&entry->skb_list)) {
791 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
792 struct ieee80211_hdr *hdr =
793 (struct ieee80211_hdr *) entry->skb_list.next->data;
794 DECLARE_MAC_BUF(mac);
795 DECLARE_MAC_BUF(mac2);
796 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
797 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
798 "addr1=%s addr2=%s\n",
799 sdata->dev->name, idx,
800 jiffies - entry->first_frag_time, entry->seq,
801 entry->last_frag, print_mac(mac, hdr->addr1),
802 print_mac(mac2, hdr->addr2));
804 __skb_queue_purge(&entry->skb_list);
807 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
809 entry->first_frag_time = jiffies;
811 entry->rx_queue = rx_queue;
812 entry->last_frag = frag;
814 entry->extra_len = 0;
819 static inline struct ieee80211_fragment_entry *
820 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
821 u16 fc, unsigned int frag, unsigned int seq,
822 int rx_queue, struct ieee80211_hdr *hdr)
824 struct ieee80211_fragment_entry *entry;
827 idx = sdata->fragment_next;
828 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
829 struct ieee80211_hdr *f_hdr;
834 idx = IEEE80211_FRAGMENT_MAX - 1;
836 entry = &sdata->fragments[idx];
837 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
838 entry->rx_queue != rx_queue ||
839 entry->last_frag + 1 != frag)
842 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
843 f_fc = le16_to_cpu(f_hdr->frame_control);
845 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
846 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
847 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
850 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
851 __skb_queue_purge(&entry->skb_list);
860 static ieee80211_rx_result debug_noinline
861 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
863 struct ieee80211_hdr *hdr;
865 unsigned int frag, seq;
866 struct ieee80211_fragment_entry *entry;
868 DECLARE_MAC_BUF(mac);
870 hdr = (struct ieee80211_hdr *) rx->skb->data;
871 sc = le16_to_cpu(hdr->seq_ctrl);
872 frag = sc & IEEE80211_SCTL_FRAG;
874 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
875 (rx->skb)->len < 24 ||
876 is_multicast_ether_addr(hdr->addr1))) {
880 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
882 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
885 /* This is the first fragment of a new frame. */
886 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
887 rx->queue, &(rx->skb));
888 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
889 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
890 /* Store CCMP PN so that we can verify that the next
891 * fragment has a sequential PN value. */
893 memcpy(entry->last_pn,
894 rx->key->u.ccmp.rx_pn[rx->queue],
900 /* This is a fragment for a frame that should already be pending in
901 * fragment cache. Add this fragment to the end of the pending entry.
903 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
906 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
907 return RX_DROP_MONITOR;
910 /* Verify that MPDUs within one MSDU have sequential PN values.
911 * (IEEE 802.11i, 8.3.3.4.5) */
914 u8 pn[CCMP_PN_LEN], *rpn;
915 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
916 return RX_DROP_UNUSABLE;
917 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
918 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
923 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
924 if (memcmp(pn, rpn, CCMP_PN_LEN))
925 return RX_DROP_UNUSABLE;
926 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
929 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
930 __skb_queue_tail(&entry->skb_list, rx->skb);
931 entry->last_frag = frag;
932 entry->extra_len += rx->skb->len;
933 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
938 rx->skb = __skb_dequeue(&entry->skb_list);
939 if (skb_tailroom(rx->skb) < entry->extra_len) {
940 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
941 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
943 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
944 __skb_queue_purge(&entry->skb_list);
945 return RX_DROP_UNUSABLE;
948 while ((skb = __skb_dequeue(&entry->skb_list))) {
949 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
953 /* Complete frame has been reassembled - process it now */
954 rx->flags |= IEEE80211_RX_FRAGMENTED;
958 rx->sta->rx_packets++;
959 if (is_multicast_ether_addr(hdr->addr1))
960 rx->local->dot11MulticastReceivedFrameCount++;
962 ieee80211_led_rx(rx->local);
966 static ieee80211_rx_result debug_noinline
967 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
969 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
972 DECLARE_MAC_BUF(mac);
974 if (likely(!rx->sta ||
975 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
976 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
977 !(rx->flags & IEEE80211_RX_RA_MATCH)))
980 if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
981 (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
982 return RX_DROP_UNUSABLE;
984 skb = skb_dequeue(&rx->sta->tx_filtered);
986 skb = skb_dequeue(&rx->sta->ps_tx_buf);
988 rx->local->total_ps_buffered--;
990 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
991 skb_queue_empty(&rx->sta->ps_tx_buf);
994 struct ieee80211_hdr *hdr =
995 (struct ieee80211_hdr *) skb->data;
998 * Tell TX path to send one frame even though the STA may
999 * still remain is PS mode after this frame exchange.
1001 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1003 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1004 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
1005 print_mac(mac, rx->sta->addr), rx->sta->aid,
1006 skb_queue_len(&rx->sta->ps_tx_buf));
1007 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1009 /* Use MoreData flag to indicate whether there are more
1010 * buffered frames for this STA */
1011 if (no_pending_pkts)
1012 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1014 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1016 dev_queue_xmit(skb);
1018 if (no_pending_pkts)
1019 sta_info_clear_tim_bit(rx->sta);
1020 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1021 } else if (!rx->sent_ps_buffered) {
1023 * FIXME: This can be the result of a race condition between
1024 * us expiring a frame and the station polling for it.
1025 * Should we send it a null-func frame indicating we
1026 * have nothing buffered for it?
1028 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
1029 "though there are no buffered frames for it\n",
1030 rx->dev->name, print_mac(mac, rx->sta->addr));
1031 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1034 /* Free PS Poll skb here instead of returning RX_DROP that would
1035 * count as an dropped frame. */
1036 dev_kfree_skb(rx->skb);
1041 static ieee80211_rx_result debug_noinline
1042 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1044 u8 *data = rx->skb->data;
1045 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1047 if (!ieee80211_is_data_qos(hdr->frame_control))
1050 /* remove the qos control field, update frame type and meta-data */
1051 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1052 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1053 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1054 /* change frame type to non QOS */
1055 rx->fc &= ~IEEE80211_STYPE_QOS_DATA;
1056 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1062 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1064 if (unlikely(!rx->sta ||
1065 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1072 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx)
1075 * Pass through unencrypted frames if the hardware has
1076 * decrypted them already.
1078 if (rx->status->flag & RX_FLAG_DECRYPTED)
1081 /* Drop unencrypted frames if key is set. */
1082 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1083 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1084 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1085 (rx->key || rx->sdata->drop_unencrypted)))
1092 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1094 struct net_device *dev = rx->dev;
1095 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1096 u16 fc, hdrlen, ethertype;
1099 u8 src[ETH_ALEN] __aligned(2);
1100 struct sk_buff *skb = rx->skb;
1101 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1102 DECLARE_MAC_BUF(mac);
1103 DECLARE_MAC_BUF(mac2);
1104 DECLARE_MAC_BUF(mac3);
1105 DECLARE_MAC_BUF(mac4);
1109 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1112 hdrlen = ieee80211_get_hdrlen(fc);
1114 if (ieee80211_vif_is_mesh(&sdata->vif))
1115 hdrlen += ieee80211_get_mesh_hdrlen(
1116 (struct ieee80211s_hdr *) (skb->data + hdrlen));
1118 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1120 * IEEE 802.11 address fields:
1121 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1122 * 0 0 DA SA BSSID n/a
1123 * 0 1 DA BSSID SA n/a
1124 * 1 0 BSSID SA DA n/a
1128 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1129 case IEEE80211_FCTL_TODS:
1131 memcpy(dst, hdr->addr3, ETH_ALEN);
1132 memcpy(src, hdr->addr2, ETH_ALEN);
1134 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
1135 sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
1138 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1140 memcpy(dst, hdr->addr3, ETH_ALEN);
1141 memcpy(src, hdr->addr4, ETH_ALEN);
1143 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
1144 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
1147 case IEEE80211_FCTL_FROMDS:
1149 memcpy(dst, hdr->addr1, ETH_ALEN);
1150 memcpy(src, hdr->addr3, ETH_ALEN);
1152 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
1153 (is_multicast_ether_addr(dst) &&
1154 !compare_ether_addr(src, dev->dev_addr)))
1159 memcpy(dst, hdr->addr1, ETH_ALEN);
1160 memcpy(src, hdr->addr2, ETH_ALEN);
1162 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1167 if (unlikely(skb->len - hdrlen < 8))
1170 payload = skb->data + hdrlen;
1171 ethertype = (payload[6] << 8) | payload[7];
1173 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1174 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1175 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1176 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1177 * replace EtherType */
1178 skb_pull(skb, hdrlen + 6);
1179 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1180 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1182 struct ethhdr *ehdr;
1185 skb_pull(skb, hdrlen);
1186 len = htons(skb->len);
1187 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1188 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1189 memcpy(ehdr->h_source, src, ETH_ALEN);
1190 ehdr->h_proto = len;
1196 * requires that rx->skb is a frame with ethernet header
1198 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx)
1200 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1201 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1202 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1205 * Allow EAPOL frames to us/the PAE group address regardless
1206 * of whether the frame was encrypted or not.
1208 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1209 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1210 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1213 if (ieee80211_802_1x_port_control(rx) ||
1214 ieee80211_drop_unencrypted(rx))
1221 * requires that rx->skb is a frame with ethernet header
1224 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1226 struct net_device *dev = rx->dev;
1227 struct ieee80211_local *local = rx->local;
1228 struct sk_buff *skb, *xmit_skb;
1229 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1230 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1231 struct sta_info *dsta;
1236 if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1237 sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
1238 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1239 if (is_multicast_ether_addr(ehdr->h_dest)) {
1241 * send multicast frames both to higher layers in
1242 * local net stack and back to the wireless medium
1244 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1245 if (!xmit_skb && net_ratelimit())
1246 printk(KERN_DEBUG "%s: failed to clone "
1247 "multicast frame\n", dev->name);
1249 dsta = sta_info_get(local, skb->data);
1250 if (dsta && dsta->sdata->dev == dev) {
1252 * The destination station is associated to
1253 * this AP (in this VLAN), so send the frame
1254 * directly to it and do not pass it to local
1264 /* deliver to local stack */
1265 skb->protocol = eth_type_trans(skb, dev);
1266 memset(skb->cb, 0, sizeof(skb->cb));
1271 /* send to wireless media */
1272 xmit_skb->protocol = htons(ETH_P_802_3);
1273 skb_reset_network_header(xmit_skb);
1274 skb_reset_mac_header(xmit_skb);
1275 dev_queue_xmit(xmit_skb);
1279 static ieee80211_rx_result debug_noinline
1280 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1282 struct net_device *dev = rx->dev;
1283 struct ieee80211_local *local = rx->local;
1286 struct sk_buff *skb = rx->skb, *frame = NULL;
1287 const struct ethhdr *eth;
1291 DECLARE_MAC_BUF(mac);
1294 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1297 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1298 return RX_DROP_MONITOR;
1300 if (!(rx->flags & IEEE80211_RX_AMSDU))
1303 err = ieee80211_data_to_8023(rx);
1305 return RX_DROP_UNUSABLE;
1309 dev->stats.rx_packets++;
1310 dev->stats.rx_bytes += skb->len;
1312 /* skip the wrapping header */
1313 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1315 return RX_DROP_UNUSABLE;
1317 while (skb != frame) {
1319 __be16 len = eth->h_proto;
1320 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1322 remaining = skb->len;
1323 memcpy(dst, eth->h_dest, ETH_ALEN);
1324 memcpy(src, eth->h_source, ETH_ALEN);
1326 padding = ((4 - subframe_len) & 0x3);
1327 /* the last MSDU has no padding */
1328 if (subframe_len > remaining)
1329 return RX_DROP_UNUSABLE;
1331 skb_pull(skb, sizeof(struct ethhdr));
1332 /* if last subframe reuse skb */
1333 if (remaining <= subframe_len + padding)
1336 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1340 return RX_DROP_UNUSABLE;
1342 skb_reserve(frame, local->hw.extra_tx_headroom +
1343 sizeof(struct ethhdr));
1344 memcpy(skb_put(frame, ntohs(len)), skb->data,
1347 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1350 dev_kfree_skb(frame);
1351 return RX_DROP_UNUSABLE;
1355 skb_reset_network_header(frame);
1357 frame->priority = skb->priority;
1360 payload = frame->data;
1361 ethertype = (payload[6] << 8) | payload[7];
1363 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1364 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1365 compare_ether_addr(payload,
1366 bridge_tunnel_header) == 0)) {
1367 /* remove RFC1042 or Bridge-Tunnel
1368 * encapsulation and replace EtherType */
1370 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1371 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1373 memcpy(skb_push(frame, sizeof(__be16)),
1374 &len, sizeof(__be16));
1375 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1376 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1379 if (!ieee80211_frame_allowed(rx)) {
1380 if (skb == frame) /* last frame */
1381 return RX_DROP_UNUSABLE;
1382 dev_kfree_skb(frame);
1386 ieee80211_deliver_skb(rx);
1392 static ieee80211_rx_result debug_noinline
1393 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1395 struct ieee80211_hdr *hdr;
1396 struct ieee80211s_hdr *mesh_hdr;
1397 unsigned int hdrlen;
1398 struct sk_buff *skb = rx->skb, *fwd_skb;
1400 hdr = (struct ieee80211_hdr *) skb->data;
1401 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1402 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1404 if (!ieee80211_is_data(hdr->frame_control))
1409 return RX_DROP_MONITOR;
1411 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1416 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1418 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.sta,
1419 dropped_frames_ttl);
1421 struct ieee80211_hdr *fwd_hdr;
1422 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1424 if (!fwd_skb && net_ratelimit())
1425 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1428 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1430 * Save TA to addr1 to send TA a path error if a
1431 * suitable next hop is not found
1433 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1434 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1435 fwd_skb->dev = rx->local->mdev;
1436 fwd_skb->iif = rx->dev->ifindex;
1437 dev_queue_xmit(fwd_skb);
1441 if (is_multicast_ether_addr(hdr->addr3) ||
1442 rx->dev->flags & IFF_PROMISC)
1445 return RX_DROP_MONITOR;
1449 static ieee80211_rx_result debug_noinline
1450 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1452 struct net_device *dev = rx->dev;
1457 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1460 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1461 return RX_DROP_MONITOR;
1463 err = ieee80211_data_to_8023(rx);
1465 return RX_DROP_UNUSABLE;
1467 if (!ieee80211_frame_allowed(rx))
1468 return RX_DROP_MONITOR;
1472 dev->stats.rx_packets++;
1473 dev->stats.rx_bytes += rx->skb->len;
1475 ieee80211_deliver_skb(rx);
1480 static ieee80211_rx_result debug_noinline
1481 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1483 struct ieee80211_local *local = rx->local;
1484 struct ieee80211_hw *hw = &local->hw;
1485 struct sk_buff *skb = rx->skb;
1486 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1487 struct tid_ampdu_rx *tid_agg_rx;
1491 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1494 if (ieee80211_is_back_req(bar->frame_control)) {
1497 tid = le16_to_cpu(bar->control) >> 12;
1498 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1499 != HT_AGG_STATE_OPERATIONAL)
1501 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1503 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1505 /* reset session timer */
1506 if (tid_agg_rx->timeout) {
1507 unsigned long expires =
1508 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1509 mod_timer(&tid_agg_rx->session_timer, expires);
1512 /* manage reordering buffer according to requested */
1513 /* sequence number */
1515 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1518 return RX_DROP_UNUSABLE;
1524 static ieee80211_rx_result debug_noinline
1525 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1527 struct ieee80211_sub_if_data *sdata;
1529 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1530 return RX_DROP_MONITOR;
1532 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1533 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1534 sdata->vif.type == IEEE80211_IF_TYPE_IBSS ||
1535 sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) &&
1536 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1537 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status);
1539 return RX_DROP_MONITOR;
1544 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1545 struct ieee80211_hdr *hdr,
1546 struct ieee80211_rx_data *rx)
1549 unsigned int hdrlen;
1550 DECLARE_MAC_BUF(mac);
1551 DECLARE_MAC_BUF(mac2);
1553 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1554 if (rx->skb->len >= hdrlen + 4)
1555 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1561 * Some hardware seem to generate incorrect Michael MIC
1562 * reports; ignore them to avoid triggering countermeasures.
1567 if (!ieee80211_has_protected(hdr->frame_control))
1570 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
1572 * APs with pairwise keys should never receive Michael MIC
1573 * errors for non-zero keyidx because these are reserved for
1574 * group keys and only the AP is sending real multicast
1575 * frames in the BSS.
1580 if (!ieee80211_is_data(hdr->frame_control) &&
1581 !ieee80211_is_auth(hdr->frame_control))
1584 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1586 dev_kfree_skb(rx->skb);
1590 /* TODO: use IEEE80211_RX_FRAGMENTED */
1591 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1593 struct ieee80211_sub_if_data *sdata;
1594 struct ieee80211_local *local = rx->local;
1595 struct ieee80211_rtap_hdr {
1596 struct ieee80211_radiotap_header hdr;
1601 } __attribute__ ((packed)) *rthdr;
1602 struct sk_buff *skb = rx->skb, *skb2;
1603 struct net_device *prev_dev = NULL;
1604 struct ieee80211_rx_status *status = rx->status;
1606 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1609 if (skb_headroom(skb) < sizeof(*rthdr) &&
1610 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1613 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1614 memset(rthdr, 0, sizeof(*rthdr));
1615 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1616 rthdr->hdr.it_present =
1617 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1618 (1 << IEEE80211_RADIOTAP_RATE) |
1619 (1 << IEEE80211_RADIOTAP_CHANNEL));
1621 rthdr->rate = rx->rate->bitrate / 5;
1622 rthdr->chan_freq = cpu_to_le16(status->freq);
1624 if (status->band == IEEE80211_BAND_5GHZ)
1625 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1626 IEEE80211_CHAN_5GHZ);
1628 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1629 IEEE80211_CHAN_2GHZ);
1631 skb_set_mac_header(skb, 0);
1632 skb->ip_summed = CHECKSUM_UNNECESSARY;
1633 skb->pkt_type = PACKET_OTHERHOST;
1634 skb->protocol = htons(ETH_P_802_2);
1636 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1637 if (!netif_running(sdata->dev))
1640 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
1641 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1645 skb2 = skb_clone(skb, GFP_ATOMIC);
1647 skb2->dev = prev_dev;
1652 prev_dev = sdata->dev;
1653 sdata->dev->stats.rx_packets++;
1654 sdata->dev->stats.rx_bytes += skb->len;
1658 skb->dev = prev_dev;
1664 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1672 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1673 struct ieee80211_rx_data *rx,
1674 struct sk_buff *skb)
1676 ieee80211_rx_result res = RX_DROP_MONITOR;
1680 rx->dev = sdata->dev;
1682 #define CALL_RXH(rxh) \
1685 if (res != RX_CONTINUE) \
1689 CALL_RXH(ieee80211_rx_h_passive_scan)
1690 CALL_RXH(ieee80211_rx_h_check)
1691 CALL_RXH(ieee80211_rx_h_decrypt)
1692 CALL_RXH(ieee80211_rx_h_sta_process)
1693 CALL_RXH(ieee80211_rx_h_defragment)
1694 CALL_RXH(ieee80211_rx_h_ps_poll)
1695 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1696 /* must be after MMIC verify so header is counted in MPDU mic */
1697 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1698 CALL_RXH(ieee80211_rx_h_amsdu)
1699 if (ieee80211_vif_is_mesh(&sdata->vif))
1700 CALL_RXH(ieee80211_rx_h_mesh_fwding);
1701 CALL_RXH(ieee80211_rx_h_data)
1702 CALL_RXH(ieee80211_rx_h_ctrl)
1703 CALL_RXH(ieee80211_rx_h_mgmt)
1709 case RX_DROP_MONITOR:
1710 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1712 rx->sta->rx_dropped++;
1715 ieee80211_rx_cooked_monitor(rx);
1717 case RX_DROP_UNUSABLE:
1718 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1720 rx->sta->rx_dropped++;
1721 dev_kfree_skb(rx->skb);
1724 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1729 /* main receive path */
1731 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1732 u8 *bssid, struct ieee80211_rx_data *rx,
1733 struct ieee80211_hdr *hdr)
1735 int multicast = is_multicast_ether_addr(hdr->addr1);
1737 switch (sdata->vif.type) {
1738 case IEEE80211_IF_TYPE_STA:
1741 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1742 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1744 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1745 } else if (!multicast &&
1746 compare_ether_addr(sdata->dev->dev_addr,
1748 if (!(sdata->dev->flags & IFF_PROMISC))
1750 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1753 case IEEE80211_IF_TYPE_IBSS:
1756 if (ieee80211_is_beacon(hdr->frame_control)) {
1758 rx->sta = ieee80211_ibss_add_sta(sdata->dev,
1759 rx->skb, bssid, hdr->addr2,
1760 BIT(rx->status->rate_idx));
1763 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1764 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1766 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1767 } else if (!multicast &&
1768 compare_ether_addr(sdata->dev->dev_addr,
1770 if (!(sdata->dev->flags & IFF_PROMISC))
1772 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1773 } else if (!rx->sta)
1774 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1776 BIT(rx->status->rate_idx));
1778 case IEEE80211_IF_TYPE_MESH_POINT:
1780 compare_ether_addr(sdata->dev->dev_addr,
1782 if (!(sdata->dev->flags & IFF_PROMISC))
1785 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1788 case IEEE80211_IF_TYPE_VLAN:
1789 case IEEE80211_IF_TYPE_AP:
1791 if (compare_ether_addr(sdata->dev->dev_addr,
1794 } else if (!ieee80211_bssid_match(bssid,
1795 sdata->dev->dev_addr)) {
1796 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1798 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1801 case IEEE80211_IF_TYPE_WDS:
1802 if (bssid || !ieee80211_is_data(hdr->frame_control))
1804 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1807 case IEEE80211_IF_TYPE_MNTR:
1808 /* take everything */
1810 case IEEE80211_IF_TYPE_INVALID:
1811 /* should never get here */
1820 * This is the actual Rx frames handler. as it blongs to Rx path it must
1821 * be called with rcu_read_lock protection.
1823 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1824 struct sk_buff *skb,
1825 struct ieee80211_rx_status *status,
1826 struct ieee80211_rate *rate)
1828 struct ieee80211_local *local = hw_to_local(hw);
1829 struct ieee80211_sub_if_data *sdata;
1830 struct ieee80211_hdr *hdr;
1831 struct ieee80211_rx_data rx;
1834 struct ieee80211_sub_if_data *prev = NULL;
1835 struct sk_buff *skb_new;
1838 hdr = (struct ieee80211_hdr *) skb->data;
1839 memset(&rx, 0, sizeof(rx));
1845 rx.fc = le16_to_cpu(hdr->frame_control);
1846 type = rx.fc & IEEE80211_FCTL_FTYPE;
1848 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1849 local->dot11ReceivedFragmentCount++;
1851 rx.sta = sta_info_get(local, hdr->addr2);
1853 rx.sdata = rx.sta->sdata;
1854 rx.dev = rx.sta->sdata->dev;
1857 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1858 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1862 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1863 rx.flags |= IEEE80211_RX_IN_SCAN;
1865 ieee80211_parse_qos(&rx);
1866 ieee80211_verify_ip_alignment(&rx);
1870 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1871 if (!netif_running(sdata->dev))
1874 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
1877 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1878 rx.flags |= IEEE80211_RX_RA_MATCH;
1879 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1885 * frame is destined for this interface, but if it's not
1886 * also for the previous one we handle that after the
1887 * loop to avoid copying the SKB once too much
1896 * frame was destined for the previous interface
1897 * so invoke RX handlers for it
1900 skb_new = skb_copy(skb, GFP_ATOMIC);
1902 if (net_ratelimit())
1903 printk(KERN_DEBUG "%s: failed to copy "
1904 "multicast frame for %s\n",
1905 wiphy_name(local->hw.wiphy),
1909 rx.fc = le16_to_cpu(hdr->frame_control);
1910 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
1914 rx.fc = le16_to_cpu(hdr->frame_control);
1915 ieee80211_invoke_rx_handlers(prev, &rx, skb);
1920 #define SEQ_MODULO 0x1000
1921 #define SEQ_MASK 0xfff
1923 static inline int seq_less(u16 sq1, u16 sq2)
1925 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1928 static inline u16 seq_inc(u16 sq)
1930 return ((sq + 1) & SEQ_MASK);
1933 static inline u16 seq_sub(u16 sq1, u16 sq2)
1935 return ((sq1 - sq2) & SEQ_MASK);
1940 * As it function blongs to Rx path it must be called with
1941 * the proper rcu_read_lock protection for its flow.
1943 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
1944 struct tid_ampdu_rx *tid_agg_rx,
1945 struct sk_buff *skb, u16 mpdu_seq_num,
1948 struct ieee80211_local *local = hw_to_local(hw);
1949 struct ieee80211_rx_status status;
1950 u16 head_seq_num, buf_size;
1952 struct ieee80211_supported_band *sband;
1953 struct ieee80211_rate *rate;
1955 buf_size = tid_agg_rx->buf_size;
1956 head_seq_num = tid_agg_rx->head_seq_num;
1958 /* frame with out of date sequence number */
1959 if (seq_less(mpdu_seq_num, head_seq_num)) {
1964 /* if frame sequence number exceeds our buffering window size or
1965 * block Ack Request arrived - release stored frames */
1966 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
1967 /* new head to the ordering buffer */
1969 head_seq_num = mpdu_seq_num;
1972 seq_inc(seq_sub(mpdu_seq_num, buf_size));
1973 /* release stored frames up to new head to stack */
1974 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1975 index = seq_sub(tid_agg_rx->head_seq_num,
1977 % tid_agg_rx->buf_size;
1979 if (tid_agg_rx->reorder_buf[index]) {
1980 /* release the reordered frames to stack */
1982 tid_agg_rx->reorder_buf[index]->cb,
1984 sband = local->hw.wiphy->bands[status.band];
1985 rate = &sband->bitrates[status.rate_idx];
1986 __ieee80211_rx_handle_packet(hw,
1987 tid_agg_rx->reorder_buf[index],
1989 tid_agg_rx->stored_mpdu_num--;
1990 tid_agg_rx->reorder_buf[index] = NULL;
1992 tid_agg_rx->head_seq_num =
1993 seq_inc(tid_agg_rx->head_seq_num);
1999 /* now the new frame is always in the range of the reordering */
2001 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2002 % tid_agg_rx->buf_size;
2003 /* check if we already stored this frame */
2004 if (tid_agg_rx->reorder_buf[index]) {
2009 /* if arrived mpdu is in the right order and nothing else stored */
2010 /* release it immediately */
2011 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2012 tid_agg_rx->stored_mpdu_num == 0) {
2013 tid_agg_rx->head_seq_num =
2014 seq_inc(tid_agg_rx->head_seq_num);
2018 /* put the frame in the reordering buffer */
2019 tid_agg_rx->reorder_buf[index] = skb;
2020 tid_agg_rx->stored_mpdu_num++;
2021 /* release the buffer until next missing frame */
2022 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2023 % tid_agg_rx->buf_size;
2024 while (tid_agg_rx->reorder_buf[index]) {
2025 /* release the reordered frame back to stack */
2026 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2028 sband = local->hw.wiphy->bands[status.band];
2029 rate = &sband->bitrates[status.rate_idx];
2030 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2032 tid_agg_rx->stored_mpdu_num--;
2033 tid_agg_rx->reorder_buf[index] = NULL;
2034 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2035 index = seq_sub(tid_agg_rx->head_seq_num,
2036 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2041 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2042 struct sk_buff *skb)
2044 struct ieee80211_hw *hw = &local->hw;
2045 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2046 struct sta_info *sta;
2047 struct tid_ampdu_rx *tid_agg_rx;
2053 sta = sta_info_get(local, hdr->addr2);
2057 /* filter the QoS data rx stream according to
2058 * STA/TID and check if this STA/TID is on aggregation */
2059 if (!ieee80211_is_data_qos(hdr->frame_control))
2062 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2064 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2067 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2069 /* qos null data frames are excluded */
2070 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2073 /* new un-ordered ampdu frame - process it */
2075 /* reset session timer */
2076 if (tid_agg_rx->timeout) {
2077 unsigned long expires =
2078 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2079 mod_timer(&tid_agg_rx->session_timer, expires);
2082 /* if this mpdu is fragmented - terminate rx aggregation session */
2083 sc = le16_to_cpu(hdr->seq_ctrl);
2084 if (sc & IEEE80211_SCTL_FRAG) {
2085 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
2086 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2091 /* according to mpdu sequence number deal with reordering buffer */
2092 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2093 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2100 * This is the receive path handler. It is called by a low level driver when an
2101 * 802.11 MPDU is received from the hardware.
2103 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2104 struct ieee80211_rx_status *status)
2106 struct ieee80211_local *local = hw_to_local(hw);
2107 struct ieee80211_rate *rate = NULL;
2108 struct ieee80211_supported_band *sband;
2110 if (status->band < 0 ||
2111 status->band >= IEEE80211_NUM_BANDS) {
2116 sband = local->hw.wiphy->bands[status->band];
2119 status->rate_idx < 0 ||
2120 status->rate_idx >= sband->n_bitrates) {
2125 rate = &sband->bitrates[status->rate_idx];
2128 * key references and virtual interfaces are protected using RCU
2129 * and this requires that we are in a read-side RCU section during
2130 * receive processing
2135 * Frames with failed FCS/PLCP checksum are not returned,
2136 * all other frames are returned without radiotap header
2137 * if it was previously present.
2138 * Also, frames with less than 16 bytes are dropped.
2140 skb = ieee80211_rx_monitor(local, skb, status, rate);
2146 if (!ieee80211_rx_reorder_ampdu(local, skb))
2147 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2151 EXPORT_SYMBOL(__ieee80211_rx);
2153 /* This is a version of the rx handler that can be called from hard irq
2154 * context. Post the skb on the queue and schedule the tasklet */
2155 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2156 struct ieee80211_rx_status *status)
2158 struct ieee80211_local *local = hw_to_local(hw);
2160 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2162 skb->dev = local->mdev;
2163 /* copy status into skb->cb for use by tasklet */
2164 memcpy(skb->cb, status, sizeof(*status));
2165 skb->pkt_type = IEEE80211_RX_MSG;
2166 skb_queue_tail(&local->skb_queue, skb);
2167 tasklet_schedule(&local->tasklet);
2169 EXPORT_SYMBOL(ieee80211_rx_irqsafe);