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 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
30 struct tid_ampdu_rx *tid_agg_rx,
35 * monitor mode reception
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
44 skb_pull(skb, rtap_len);
46 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
47 if (likely(skb->len > FCS_LEN))
48 skb_trim(skb, skb->len - FCS_LEN);
60 static inline int should_drop_frame(struct ieee80211_rx_status *status,
65 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
67 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
69 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
71 if (ieee80211_is_ctl(hdr->frame_control) &&
72 !ieee80211_is_pspoll(hdr->frame_control) &&
73 !ieee80211_is_back_req(hdr->frame_control))
79 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
80 struct ieee80211_rx_status *status)
84 /* always present fields */
85 len = sizeof(struct ieee80211_radiotap_header) + 9;
87 if (status->flag & RX_FLAG_TSFT)
89 if (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_CHANNEL) |
126 (1 << IEEE80211_RADIOTAP_ANTENNA) |
127 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
128 rthdr->it_len = cpu_to_le16(rtap_len);
130 pos = (unsigned char *)(rthdr+1);
132 /* the order of the following fields is important */
134 /* IEEE80211_RADIOTAP_TSFT */
135 if (status->flag & RX_FLAG_TSFT) {
136 *(__le64 *)pos = cpu_to_le64(status->mactime);
138 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
142 /* IEEE80211_RADIOTAP_FLAGS */
143 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
144 *pos |= IEEE80211_RADIOTAP_F_FCS;
145 if (status->flag & RX_FLAG_SHORTPRE)
146 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
149 /* IEEE80211_RADIOTAP_RATE */
150 if (status->flag & RX_FLAG_HT) {
152 * TODO: add following information into radiotap header once
153 * suitable fields are defined for it:
154 * - MCS index (status->rate_idx)
155 * - HT40 (status->flag & RX_FLAG_40MHZ)
156 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
160 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
161 *pos = rate->bitrate / 5;
165 /* IEEE80211_RADIOTAP_CHANNEL */
166 *(__le16 *)pos = cpu_to_le16(status->freq);
168 if (status->band == IEEE80211_BAND_5GHZ)
169 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
170 IEEE80211_CHAN_5GHZ);
171 else if (rate->flags & IEEE80211_RATE_ERP_G)
172 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
173 IEEE80211_CHAN_2GHZ);
175 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
176 IEEE80211_CHAN_2GHZ);
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
180 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
181 *pos = status->signal;
183 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
187 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
188 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
189 *pos = status->noise;
191 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
195 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
197 /* IEEE80211_RADIOTAP_ANTENNA */
198 *pos = status->antenna;
201 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
203 /* IEEE80211_RADIOTAP_RX_FLAGS */
204 /* ensure 2 byte alignment for the 2 byte field as required */
205 if ((pos - (unsigned char *)rthdr) & 1)
207 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
208 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
209 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
214 * This function copies a received frame to all monitor interfaces and
215 * returns a cleaned-up SKB that no longer includes the FCS nor the
216 * radiotap header the driver might have added.
218 static struct sk_buff *
219 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
220 struct ieee80211_rx_status *status,
221 struct ieee80211_rate *rate)
223 struct ieee80211_sub_if_data *sdata;
224 int needed_headroom = 0;
225 struct sk_buff *skb, *skb2;
226 struct net_device *prev_dev = NULL;
227 int present_fcs_len = 0;
231 * First, we may need to make a copy of the skb because
232 * (1) we need to modify it for radiotap (if not present), and
233 * (2) the other RX handlers will modify the skb we got.
235 * We don't need to, of course, if we aren't going to return
236 * the SKB because it has a bad FCS/PLCP checksum.
238 if (status->flag & RX_FLAG_RADIOTAP)
239 rtap_len = ieee80211_get_radiotap_len(origskb->data);
241 /* room for the radiotap header based on driver features */
242 needed_headroom = ieee80211_rx_radiotap_len(local, status);
244 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
245 present_fcs_len = FCS_LEN;
247 if (!local->monitors) {
248 if (should_drop_frame(status, origskb, present_fcs_len,
250 dev_kfree_skb(origskb);
254 return remove_monitor_info(local, origskb, rtap_len);
257 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
258 /* only need to expand headroom if necessary */
263 * This shouldn't trigger often because most devices have an
264 * RX header they pull before we get here, and that should
265 * be big enough for our radiotap information. We should
266 * probably export the length to drivers so that we can have
267 * them allocate enough headroom to start with.
269 if (skb_headroom(skb) < needed_headroom &&
270 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
276 * Need to make a copy and possibly remove radiotap header
277 * and FCS from the original.
279 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
281 origskb = remove_monitor_info(local, origskb, rtap_len);
287 /* if necessary, prepend radiotap information */
288 if (!(status->flag & RX_FLAG_RADIOTAP))
289 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
292 skb_reset_mac_header(skb);
293 skb->ip_summed = CHECKSUM_UNNECESSARY;
294 skb->pkt_type = PACKET_OTHERHOST;
295 skb->protocol = htons(ETH_P_802_2);
297 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
298 if (!netif_running(sdata->dev))
301 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
304 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
308 skb2 = skb_clone(skb, GFP_ATOMIC);
310 skb2->dev = prev_dev;
315 prev_dev = sdata->dev;
316 sdata->dev->stats.rx_packets++;
317 sdata->dev->stats.rx_bytes += skb->len;
330 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
335 /* does the frame have a qos control field? */
336 if (ieee80211_is_data_qos(hdr->frame_control)) {
337 u8 *qc = ieee80211_get_qos_ctl(hdr);
338 /* frame has qos control */
339 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
340 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
341 rx->flags |= IEEE80211_RX_AMSDU;
343 rx->flags &= ~IEEE80211_RX_AMSDU;
346 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
348 * Sequence numbers for management frames, QoS data
349 * frames with a broadcast/multicast address in the
350 * Address 1 field, and all non-QoS data frames sent
351 * by QoS STAs are assigned using an additional single
352 * modulo-4096 counter, [...]
354 * We also use that counter for non-QoS STAs.
356 tid = NUM_RX_DATA_QUEUES - 1;
360 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
361 * For now, set skb->priority to 0 for other cases. */
362 rx->skb->priority = (tid > 7) ? 0 : tid;
366 * DOC: Packet alignment
368 * Drivers always need to pass packets that are aligned to two-byte boundaries
371 * Additionally, should, if possible, align the payload data in a way that
372 * guarantees that the contained IP header is aligned to a four-byte
373 * boundary. In the case of regular frames, this simply means aligning the
374 * payload to a four-byte boundary (because either the IP header is directly
375 * contained, or IV/RFC1042 headers that have a length divisible by four are
378 * With A-MSDU frames, however, the payload data address must yield two modulo
379 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
380 * push the IP header further back to a multiple of four again. Thankfully, the
381 * specs were sane enough this time around to require padding each A-MSDU
382 * subframe to a length that is a multiple of four.
384 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
385 * the payload is not supported, the driver is required to move the 802.11
386 * header to be directly in front of the payload in that case.
388 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
390 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
393 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
397 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
398 "unaligned packet at 0x%p\n", rx->skb->data))
401 if (!ieee80211_is_data_present(hdr->frame_control))
404 hdrlen = ieee80211_hdrlen(hdr->frame_control);
405 if (rx->flags & IEEE80211_RX_AMSDU)
407 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
408 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
414 static ieee80211_rx_result debug_noinline
415 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
417 struct ieee80211_local *local = rx->local;
418 struct sk_buff *skb = rx->skb;
420 if (unlikely(local->hw_scanning))
421 return ieee80211_scan_rx(rx->sdata, skb, rx->status);
423 if (unlikely(local->sw_scanning)) {
424 /* drop all the other packets during a software scan anyway */
425 if (ieee80211_scan_rx(rx->sdata, skb, rx->status)
431 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
432 /* scanning finished during invoking of handlers */
433 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
434 return RX_DROP_UNUSABLE;
441 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
445 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
448 return ieee80211_is_robust_mgmt_frame(hdr);
452 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
454 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
456 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
459 return ieee80211_is_robust_mgmt_frame(hdr);
463 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
464 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
466 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
467 struct ieee80211_mmie *mmie;
469 if (skb->len < 24 + sizeof(*mmie) ||
470 !is_multicast_ether_addr(hdr->da))
473 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
474 return -1; /* not a robust management frame */
476 mmie = (struct ieee80211_mmie *)
477 (skb->data + skb->len - sizeof(*mmie));
478 if (mmie->element_id != WLAN_EID_MMIE ||
479 mmie->length != sizeof(*mmie) - 2)
482 return le16_to_cpu(mmie->key_id);
486 static ieee80211_rx_result
487 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
489 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
490 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
492 if (ieee80211_is_data(hdr->frame_control)) {
493 if (!ieee80211_has_a4(hdr->frame_control))
494 return RX_DROP_MONITOR;
495 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
496 return RX_DROP_MONITOR;
499 /* If there is not an established peer link and this is not a peer link
500 * establisment frame, beacon or probe, drop the frame.
503 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
504 struct ieee80211_mgmt *mgmt;
506 if (!ieee80211_is_mgmt(hdr->frame_control))
507 return RX_DROP_MONITOR;
509 if (ieee80211_is_action(hdr->frame_control)) {
510 mgmt = (struct ieee80211_mgmt *)hdr;
511 if (mgmt->u.action.category != PLINK_CATEGORY)
512 return RX_DROP_MONITOR;
516 if (ieee80211_is_probe_req(hdr->frame_control) ||
517 ieee80211_is_probe_resp(hdr->frame_control) ||
518 ieee80211_is_beacon(hdr->frame_control))
521 return RX_DROP_MONITOR;
525 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
527 if (ieee80211_is_data(hdr->frame_control) &&
528 is_multicast_ether_addr(hdr->addr1) &&
529 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
530 return RX_DROP_MONITOR;
537 static ieee80211_rx_result debug_noinline
538 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
540 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
542 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
543 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
544 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
545 rx->sta->last_seq_ctrl[rx->queue] ==
547 if (rx->flags & IEEE80211_RX_RA_MATCH) {
548 rx->local->dot11FrameDuplicateCount++;
549 rx->sta->num_duplicates++;
551 return RX_DROP_MONITOR;
553 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
556 if (unlikely(rx->skb->len < 16)) {
557 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
558 return RX_DROP_MONITOR;
561 /* Drop disallowed frame classes based on STA auth/assoc state;
562 * IEEE 802.11, Chap 5.5.
564 * mac80211 filters only based on association state, i.e. it drops
565 * Class 3 frames from not associated stations. hostapd sends
566 * deauth/disassoc frames when needed. In addition, hostapd is
567 * responsible for filtering on both auth and assoc states.
570 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
571 return ieee80211_rx_mesh_check(rx);
573 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
574 ieee80211_is_pspoll(hdr->frame_control)) &&
575 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
576 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
577 if ((!ieee80211_has_fromds(hdr->frame_control) &&
578 !ieee80211_has_tods(hdr->frame_control) &&
579 ieee80211_is_data(hdr->frame_control)) ||
580 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
581 /* Drop IBSS frames and frames for other hosts
583 return RX_DROP_MONITOR;
586 return RX_DROP_MONITOR;
593 static ieee80211_rx_result debug_noinline
594 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
599 ieee80211_rx_result result = RX_DROP_UNUSABLE;
600 struct ieee80211_key *stakey = NULL;
601 int mmie_keyidx = -1;
606 * There are four types of keys:
608 * - IGTK (group keys for management frames)
609 * - PTK (pairwise keys)
610 * - STK (station-to-station pairwise keys)
612 * When selecting a key, we have to distinguish between multicast
613 * (including broadcast) and unicast frames, the latter can only
614 * use PTKs and STKs while the former always use GTKs and IGTKs.
615 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
616 * unicast frames can also use key indices like GTKs. Hence, if we
617 * don't have a PTK/STK we check the key index for a WEP key.
619 * Note that in a regular BSS, multicast frames are sent by the
620 * AP only, associated stations unicast the frame to the AP first
621 * which then multicasts it on their behalf.
623 * There is also a slight problem in IBSS mode: GTKs are negotiated
624 * with each station, that is something we don't currently handle.
625 * The spec seems to expect that one negotiates the same key with
626 * every station but there's no such requirement; VLANs could be
630 if (!ieee80211_has_protected(hdr->frame_control)) {
631 if (!ieee80211_is_mgmt(hdr->frame_control) ||
632 rx->sta == NULL || !test_sta_flags(rx->sta, WLAN_STA_MFP))
634 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
640 * No point in finding a key and decrypting if the frame is neither
641 * addressed to us nor a multicast frame.
643 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
647 stakey = rcu_dereference(rx->sta->key);
649 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
651 } else if (mmie_keyidx >= 0) {
652 /* Broadcast/multicast robust management frame / BIP */
653 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
654 (rx->status->flag & RX_FLAG_IV_STRIPPED))
657 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
658 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
659 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
660 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
663 * The device doesn't give us the IV so we won't be
664 * able to look up the key. That's ok though, we
665 * don't need to decrypt the frame, we just won't
666 * be able to keep statistics accurate.
667 * Except for key threshold notifications, should
668 * we somehow allow the driver to tell us which key
669 * the hardware used if this flag is set?
671 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
672 (rx->status->flag & RX_FLAG_IV_STRIPPED))
675 hdrlen = ieee80211_hdrlen(hdr->frame_control);
677 if (rx->skb->len < 8 + hdrlen)
678 return RX_DROP_UNUSABLE; /* TODO: count this? */
681 * no need to call ieee80211_wep_get_keyidx,
682 * it verifies a bunch of things we've done already
684 keyidx = rx->skb->data[hdrlen + 3] >> 6;
686 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
689 * RSNA-protected unicast frames should always be sent with
690 * pairwise or station-to-station keys, but for WEP we allow
691 * using a key index as well.
693 if (rx->key && rx->key->conf.alg != ALG_WEP &&
694 !is_multicast_ether_addr(hdr->addr1))
699 rx->key->tx_rx_count++;
700 /* TODO: add threshold stuff again */
702 return RX_DROP_MONITOR;
705 /* Check for weak IVs if possible */
706 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
707 ieee80211_is_data(hdr->frame_control) &&
708 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
709 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
710 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
711 rx->sta->wep_weak_iv_count++;
713 switch (rx->key->conf.alg) {
715 result = ieee80211_crypto_wep_decrypt(rx);
718 result = ieee80211_crypto_tkip_decrypt(rx);
721 result = ieee80211_crypto_ccmp_decrypt(rx);
724 result = ieee80211_crypto_aes_cmac_decrypt(rx);
728 /* either the frame has been decrypted or will be dropped */
729 rx->status->flag |= RX_FLAG_DECRYPTED;
734 static ieee80211_rx_result debug_noinline
735 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
737 struct ieee80211_local *local;
738 struct ieee80211_hdr *hdr;
743 hdr = (struct ieee80211_hdr *) skb->data;
745 if (!local->pspolling)
748 if (!ieee80211_has_fromds(hdr->frame_control))
749 /* this is not from AP */
752 if (!ieee80211_is_data(hdr->frame_control))
755 if (!ieee80211_has_moredata(hdr->frame_control)) {
756 /* AP has no more frames buffered for us */
757 local->pspolling = false;
761 /* more data bit is set, let's request a new frame from the AP */
762 ieee80211_send_pspoll(local, rx->sdata);
767 static void ap_sta_ps_start(struct sta_info *sta)
769 struct ieee80211_sub_if_data *sdata = sta->sdata;
770 struct ieee80211_local *local = sdata->local;
772 atomic_inc(&sdata->bss->num_sta_ps);
773 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
774 if (local->ops->sta_notify)
775 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
776 STA_NOTIFY_SLEEP, &sta->sta);
777 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
778 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
779 sdata->dev->name, sta->sta.addr, sta->sta.aid);
780 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
783 static int ap_sta_ps_end(struct sta_info *sta)
785 struct ieee80211_sub_if_data *sdata = sta->sdata;
786 struct ieee80211_local *local = sdata->local;
790 atomic_dec(&sdata->bss->num_sta_ps);
792 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
793 if (local->ops->sta_notify)
794 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
795 STA_NOTIFY_AWAKE, &sta->sta);
797 if (!skb_queue_empty(&sta->ps_tx_buf))
798 sta_info_clear_tim_bit(sta);
800 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
801 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
802 sdata->dev->name, sta->sta.addr, sta->sta.aid);
803 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
805 /* Send all buffered frames to the station */
806 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
811 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
812 local->total_ps_buffered--;
814 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
815 printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame "
816 "since STA not sleeping anymore\n", sdata->dev->name,
817 sta->sta.addr, sta->sta.aid);
818 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
826 static ieee80211_rx_result debug_noinline
827 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
829 struct sta_info *sta = rx->sta;
830 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
835 /* Update last_rx only for IBSS packets which are for the current
836 * BSSID to avoid keeping the current IBSS network alive in cases where
837 * other STAs are using different BSSID. */
838 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
839 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
840 NL80211_IFTYPE_ADHOC);
841 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
842 sta->last_rx = jiffies;
844 if (!is_multicast_ether_addr(hdr->addr1) ||
845 rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
846 /* Update last_rx only for unicast frames in order to prevent
847 * the Probe Request frames (the only broadcast frames from a
848 * STA in infrastructure mode) from keeping a connection alive.
849 * Mesh beacons will update last_rx when if they are found to
850 * match the current local configuration when processed.
852 sta->last_rx = jiffies;
855 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
859 sta->rx_bytes += rx->skb->len;
860 sta->last_signal = rx->status->signal;
861 sta->last_qual = rx->status->qual;
862 sta->last_noise = rx->status->noise;
865 * Change STA power saving mode only at the end of a frame
868 if (!ieee80211_has_morefrags(hdr->frame_control) &&
869 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
870 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
871 if (test_sta_flags(sta, WLAN_STA_PS)) {
873 * Ignore doze->wake transitions that are
874 * indicated by non-data frames, the standard
875 * is unclear here, but for example going to
876 * PS mode and then scanning would cause a
877 * doze->wake transition for the probe request,
878 * and that is clearly undesirable.
880 if (ieee80211_is_data(hdr->frame_control) &&
881 !ieee80211_has_pm(hdr->frame_control))
882 rx->sent_ps_buffered += ap_sta_ps_end(sta);
884 if (ieee80211_has_pm(hdr->frame_control))
885 ap_sta_ps_start(sta);
889 /* Drop data::nullfunc frames silently, since they are used only to
890 * control station power saving mode. */
891 if (ieee80211_is_nullfunc(hdr->frame_control)) {
892 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
893 /* Update counter and free packet here to avoid counting this
894 * as a dropped packed. */
896 dev_kfree_skb(rx->skb);
901 } /* ieee80211_rx_h_sta_process */
903 static inline struct ieee80211_fragment_entry *
904 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
905 unsigned int frag, unsigned int seq, int rx_queue,
906 struct sk_buff **skb)
908 struct ieee80211_fragment_entry *entry;
911 idx = sdata->fragment_next;
912 entry = &sdata->fragments[sdata->fragment_next++];
913 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
914 sdata->fragment_next = 0;
916 if (!skb_queue_empty(&entry->skb_list)) {
917 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
918 struct ieee80211_hdr *hdr =
919 (struct ieee80211_hdr *) entry->skb_list.next->data;
920 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
921 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
922 "addr1=%pM addr2=%pM\n",
923 sdata->dev->name, idx,
924 jiffies - entry->first_frag_time, entry->seq,
925 entry->last_frag, hdr->addr1, hdr->addr2);
927 __skb_queue_purge(&entry->skb_list);
930 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
932 entry->first_frag_time = jiffies;
934 entry->rx_queue = rx_queue;
935 entry->last_frag = frag;
937 entry->extra_len = 0;
942 static inline struct ieee80211_fragment_entry *
943 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
944 unsigned int frag, unsigned int seq,
945 int rx_queue, struct ieee80211_hdr *hdr)
947 struct ieee80211_fragment_entry *entry;
950 idx = sdata->fragment_next;
951 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
952 struct ieee80211_hdr *f_hdr;
956 idx = IEEE80211_FRAGMENT_MAX - 1;
958 entry = &sdata->fragments[idx];
959 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
960 entry->rx_queue != rx_queue ||
961 entry->last_frag + 1 != frag)
964 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
967 * Check ftype and addresses are equal, else check next fragment
969 if (((hdr->frame_control ^ f_hdr->frame_control) &
970 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
971 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
972 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
975 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
976 __skb_queue_purge(&entry->skb_list);
985 static ieee80211_rx_result debug_noinline
986 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
988 struct ieee80211_hdr *hdr;
991 unsigned int frag, seq;
992 struct ieee80211_fragment_entry *entry;
995 hdr = (struct ieee80211_hdr *)rx->skb->data;
996 fc = hdr->frame_control;
997 sc = le16_to_cpu(hdr->seq_ctrl);
998 frag = sc & IEEE80211_SCTL_FRAG;
1000 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1001 (rx->skb)->len < 24 ||
1002 is_multicast_ether_addr(hdr->addr1))) {
1003 /* not fragmented */
1006 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1008 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1011 /* This is the first fragment of a new frame. */
1012 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1013 rx->queue, &(rx->skb));
1014 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1015 ieee80211_has_protected(fc)) {
1016 /* Store CCMP PN so that we can verify that the next
1017 * fragment has a sequential PN value. */
1019 memcpy(entry->last_pn,
1020 rx->key->u.ccmp.rx_pn[rx->queue],
1026 /* This is a fragment for a frame that should already be pending in
1027 * fragment cache. Add this fragment to the end of the pending entry.
1029 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1031 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1032 return RX_DROP_MONITOR;
1035 /* Verify that MPDUs within one MSDU have sequential PN values.
1036 * (IEEE 802.11i, 8.3.3.4.5) */
1039 u8 pn[CCMP_PN_LEN], *rpn;
1040 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1041 return RX_DROP_UNUSABLE;
1042 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1043 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1048 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1049 if (memcmp(pn, rpn, CCMP_PN_LEN))
1050 return RX_DROP_UNUSABLE;
1051 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1054 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1055 __skb_queue_tail(&entry->skb_list, rx->skb);
1056 entry->last_frag = frag;
1057 entry->extra_len += rx->skb->len;
1058 if (ieee80211_has_morefrags(fc)) {
1063 rx->skb = __skb_dequeue(&entry->skb_list);
1064 if (skb_tailroom(rx->skb) < entry->extra_len) {
1065 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1066 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1068 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1069 __skb_queue_purge(&entry->skb_list);
1070 return RX_DROP_UNUSABLE;
1073 while ((skb = __skb_dequeue(&entry->skb_list))) {
1074 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1078 /* Complete frame has been reassembled - process it now */
1079 rx->flags |= IEEE80211_RX_FRAGMENTED;
1083 rx->sta->rx_packets++;
1084 if (is_multicast_ether_addr(hdr->addr1))
1085 rx->local->dot11MulticastReceivedFrameCount++;
1087 ieee80211_led_rx(rx->local);
1091 static ieee80211_rx_result debug_noinline
1092 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1094 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1095 struct sk_buff *skb;
1096 int no_pending_pkts;
1097 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1099 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1100 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1103 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1104 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1105 return RX_DROP_UNUSABLE;
1107 skb = skb_dequeue(&rx->sta->tx_filtered);
1109 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1111 rx->local->total_ps_buffered--;
1113 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1114 skb_queue_empty(&rx->sta->ps_tx_buf);
1117 struct ieee80211_hdr *hdr =
1118 (struct ieee80211_hdr *) skb->data;
1121 * Tell TX path to send one frame even though the STA may
1122 * still remain is PS mode after this frame exchange.
1124 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1126 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1127 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1128 rx->sta->sta.addr, rx->sta->sta.aid,
1129 skb_queue_len(&rx->sta->ps_tx_buf));
1130 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1132 /* Use MoreData flag to indicate whether there are more
1133 * buffered frames for this STA */
1134 if (no_pending_pkts)
1135 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1137 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1139 dev_queue_xmit(skb);
1141 if (no_pending_pkts)
1142 sta_info_clear_tim_bit(rx->sta);
1143 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1144 } else if (!rx->sent_ps_buffered) {
1146 * FIXME: This can be the result of a race condition between
1147 * us expiring a frame and the station polling for it.
1148 * Should we send it a null-func frame indicating we
1149 * have nothing buffered for it?
1151 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1152 "though there are no buffered frames for it\n",
1153 rx->dev->name, rx->sta->sta.addr);
1154 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1157 /* Free PS Poll skb here instead of returning RX_DROP that would
1158 * count as an dropped frame. */
1159 dev_kfree_skb(rx->skb);
1164 static ieee80211_rx_result debug_noinline
1165 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1167 u8 *data = rx->skb->data;
1168 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1170 if (!ieee80211_is_data_qos(hdr->frame_control))
1173 /* remove the qos control field, update frame type and meta-data */
1174 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1175 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1176 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1177 /* change frame type to non QOS */
1178 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1184 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1186 if (unlikely(!rx->sta ||
1187 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1194 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1197 * Pass through unencrypted frames if the hardware has
1198 * decrypted them already.
1200 if (rx->status->flag & RX_FLAG_DECRYPTED)
1203 /* Drop unencrypted frames if key is set. */
1204 if (unlikely(!ieee80211_has_protected(fc) &&
1205 !ieee80211_is_nullfunc(fc) &&
1206 (!ieee80211_is_mgmt(fc) ||
1207 (ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1208 rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP))) &&
1209 (rx->key || rx->sdata->drop_unencrypted)))
1211 /* BIP does not use Protected field, so need to check MMIE */
1212 if (unlikely(rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP) &&
1213 ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1214 ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1215 (rx->key || rx->sdata->drop_unencrypted)))
1222 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1224 struct net_device *dev = rx->dev;
1225 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1226 u16 hdrlen, ethertype;
1229 u8 src[ETH_ALEN] __aligned(2);
1230 struct sk_buff *skb = rx->skb;
1231 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1233 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1236 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1238 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1240 * IEEE 802.11 address fields:
1241 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1242 * 0 0 DA SA BSSID n/a
1243 * 0 1 DA BSSID SA n/a
1244 * 1 0 BSSID SA DA n/a
1247 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1248 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
1250 switch (hdr->frame_control &
1251 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1252 case cpu_to_le16(IEEE80211_FCTL_TODS):
1253 if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP &&
1254 sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1257 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1258 if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS &&
1259 sdata->vif.type != NL80211_IFTYPE_MESH_POINT))
1261 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1262 struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *)
1263 (skb->data + hdrlen);
1264 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
1265 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
1266 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
1267 memcpy(src, meshdr->eaddr2, ETH_ALEN);
1271 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
1272 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1273 (is_multicast_ether_addr(dst) &&
1274 !compare_ether_addr(src, dev->dev_addr)))
1277 case cpu_to_le16(0):
1278 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1283 if (unlikely(skb->len - hdrlen < 8))
1286 payload = skb->data + hdrlen;
1287 ethertype = (payload[6] << 8) | payload[7];
1289 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1290 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1291 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1292 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1293 * replace EtherType */
1294 skb_pull(skb, hdrlen + 6);
1295 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1296 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1298 struct ethhdr *ehdr;
1301 skb_pull(skb, hdrlen);
1302 len = htons(skb->len);
1303 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1304 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1305 memcpy(ehdr->h_source, src, ETH_ALEN);
1306 ehdr->h_proto = len;
1312 * requires that rx->skb is a frame with ethernet header
1314 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1316 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1317 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1318 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1321 * Allow EAPOL frames to us/the PAE group address regardless
1322 * of whether the frame was encrypted or not.
1324 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1325 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1326 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1329 if (ieee80211_802_1x_port_control(rx) ||
1330 ieee80211_drop_unencrypted(rx, fc))
1337 * requires that rx->skb is a frame with ethernet header
1340 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1342 struct net_device *dev = rx->dev;
1343 struct ieee80211_local *local = rx->local;
1344 struct sk_buff *skb, *xmit_skb;
1345 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1346 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1347 struct sta_info *dsta;
1352 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1353 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1354 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1355 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1356 if (is_multicast_ether_addr(ehdr->h_dest)) {
1358 * send multicast frames both to higher layers in
1359 * local net stack and back to the wireless medium
1361 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1362 if (!xmit_skb && net_ratelimit())
1363 printk(KERN_DEBUG "%s: failed to clone "
1364 "multicast frame\n", dev->name);
1366 dsta = sta_info_get(local, skb->data);
1367 if (dsta && dsta->sdata->dev == dev) {
1369 * The destination station is associated to
1370 * this AP (in this VLAN), so send the frame
1371 * directly to it and do not pass it to local
1381 int align __maybe_unused;
1383 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1385 * 'align' will only take the values 0 or 2 here
1386 * since all frames are required to be aligned
1387 * to 2-byte boundaries when being passed to
1388 * mac80211. That also explains the __skb_push()
1391 align = (unsigned long)skb->data & 4;
1393 if (WARN_ON(skb_headroom(skb) < 3)) {
1397 u8 *data = skb->data;
1398 size_t len = skb->len;
1399 u8 *new = __skb_push(skb, align);
1400 memmove(new, data, len);
1401 __skb_trim(skb, len);
1407 /* deliver to local stack */
1408 skb->protocol = eth_type_trans(skb, dev);
1409 memset(skb->cb, 0, sizeof(skb->cb));
1415 /* send to wireless media */
1416 xmit_skb->protocol = htons(ETH_P_802_3);
1417 skb_reset_network_header(xmit_skb);
1418 skb_reset_mac_header(xmit_skb);
1419 dev_queue_xmit(xmit_skb);
1423 static ieee80211_rx_result debug_noinline
1424 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1426 struct net_device *dev = rx->dev;
1427 struct ieee80211_local *local = rx->local;
1430 struct sk_buff *skb = rx->skb, *frame = NULL;
1431 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1432 __le16 fc = hdr->frame_control;
1433 const struct ethhdr *eth;
1438 if (unlikely(!ieee80211_is_data(fc)))
1441 if (unlikely(!ieee80211_is_data_present(fc)))
1442 return RX_DROP_MONITOR;
1444 if (!(rx->flags & IEEE80211_RX_AMSDU))
1447 err = ieee80211_data_to_8023(rx);
1449 return RX_DROP_UNUSABLE;
1453 dev->stats.rx_packets++;
1454 dev->stats.rx_bytes += skb->len;
1456 /* skip the wrapping header */
1457 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1459 return RX_DROP_UNUSABLE;
1461 while (skb != frame) {
1463 __be16 len = eth->h_proto;
1464 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1466 remaining = skb->len;
1467 memcpy(dst, eth->h_dest, ETH_ALEN);
1468 memcpy(src, eth->h_source, ETH_ALEN);
1470 padding = ((4 - subframe_len) & 0x3);
1471 /* the last MSDU has no padding */
1472 if (subframe_len > remaining)
1473 return RX_DROP_UNUSABLE;
1475 skb_pull(skb, sizeof(struct ethhdr));
1476 /* if last subframe reuse skb */
1477 if (remaining <= subframe_len + padding)
1481 * Allocate and reserve two bytes more for payload
1482 * alignment since sizeof(struct ethhdr) is 14.
1484 frame = dev_alloc_skb(
1485 ALIGN(local->hw.extra_tx_headroom, 4) +
1489 return RX_DROP_UNUSABLE;
1492 ALIGN(local->hw.extra_tx_headroom, 4) +
1493 sizeof(struct ethhdr) + 2);
1494 memcpy(skb_put(frame, ntohs(len)), skb->data,
1497 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1500 dev_kfree_skb(frame);
1501 return RX_DROP_UNUSABLE;
1505 skb_reset_network_header(frame);
1507 frame->priority = skb->priority;
1510 payload = frame->data;
1511 ethertype = (payload[6] << 8) | payload[7];
1513 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1514 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1515 compare_ether_addr(payload,
1516 bridge_tunnel_header) == 0)) {
1517 /* remove RFC1042 or Bridge-Tunnel
1518 * encapsulation and replace EtherType */
1520 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1521 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1523 memcpy(skb_push(frame, sizeof(__be16)),
1524 &len, sizeof(__be16));
1525 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1526 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1529 if (!ieee80211_frame_allowed(rx, fc)) {
1530 if (skb == frame) /* last frame */
1531 return RX_DROP_UNUSABLE;
1532 dev_kfree_skb(frame);
1536 ieee80211_deliver_skb(rx);
1542 #ifdef CONFIG_MAC80211_MESH
1543 static ieee80211_rx_result
1544 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1546 struct ieee80211_hdr *hdr;
1547 struct ieee80211s_hdr *mesh_hdr;
1548 unsigned int hdrlen;
1549 struct sk_buff *skb = rx->skb, *fwd_skb;
1551 hdr = (struct ieee80211_hdr *) skb->data;
1552 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1553 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1555 if (!ieee80211_is_data(hdr->frame_control))
1560 return RX_DROP_MONITOR;
1562 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1563 struct ieee80211_sub_if_data *sdata;
1564 struct mesh_path *mppath;
1566 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1568 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1570 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1572 spin_lock_bh(&mppath->state_lock);
1573 mppath->exp_time = jiffies;
1574 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1575 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1576 spin_unlock_bh(&mppath->state_lock);
1581 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1586 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1588 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1589 dropped_frames_ttl);
1591 struct ieee80211_hdr *fwd_hdr;
1592 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1594 if (!fwd_skb && net_ratelimit())
1595 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1598 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1600 * Save TA to addr1 to send TA a path error if a
1601 * suitable next hop is not found
1603 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1604 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1605 fwd_skb->dev = rx->local->mdev;
1606 fwd_skb->iif = rx->dev->ifindex;
1607 dev_queue_xmit(fwd_skb);
1611 if (is_multicast_ether_addr(hdr->addr3) ||
1612 rx->dev->flags & IFF_PROMISC)
1615 return RX_DROP_MONITOR;
1619 static ieee80211_rx_result debug_noinline
1620 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1622 struct net_device *dev = rx->dev;
1623 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1624 __le16 fc = hdr->frame_control;
1627 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1630 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1631 return RX_DROP_MONITOR;
1633 err = ieee80211_data_to_8023(rx);
1635 return RX_DROP_UNUSABLE;
1637 if (!ieee80211_frame_allowed(rx, fc))
1638 return RX_DROP_MONITOR;
1642 dev->stats.rx_packets++;
1643 dev->stats.rx_bytes += rx->skb->len;
1645 ieee80211_deliver_skb(rx);
1650 static ieee80211_rx_result debug_noinline
1651 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1653 struct ieee80211_local *local = rx->local;
1654 struct ieee80211_hw *hw = &local->hw;
1655 struct sk_buff *skb = rx->skb;
1656 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1657 struct tid_ampdu_rx *tid_agg_rx;
1661 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1664 if (ieee80211_is_back_req(bar->frame_control)) {
1667 tid = le16_to_cpu(bar->control) >> 12;
1668 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1669 != HT_AGG_STATE_OPERATIONAL)
1671 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1673 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1675 /* reset session timer */
1676 if (tid_agg_rx->timeout) {
1677 unsigned long expires =
1678 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1679 mod_timer(&tid_agg_rx->session_timer, expires);
1682 /* manage reordering buffer according to requested */
1683 /* sequence number */
1685 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1688 return RX_DROP_UNUSABLE;
1694 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1695 struct ieee80211_mgmt *mgmt,
1698 struct ieee80211_local *local = sdata->local;
1699 struct sk_buff *skb;
1700 struct ieee80211_mgmt *resp;
1702 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1703 /* Not to own unicast address */
1707 if (compare_ether_addr(mgmt->sa, sdata->u.sta.bssid) != 0 ||
1708 compare_ether_addr(mgmt->bssid, sdata->u.sta.bssid) != 0) {
1709 /* Not from the current AP. */
1713 if (sdata->u.sta.state == IEEE80211_STA_MLME_ASSOCIATE) {
1714 /* Association in progress; ignore SA Query */
1718 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1719 /* Too short SA Query request frame */
1723 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1727 skb_reserve(skb, local->hw.extra_tx_headroom);
1728 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1729 memset(resp, 0, 24);
1730 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1731 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1732 memcpy(resp->bssid, sdata->u.sta.bssid, ETH_ALEN);
1733 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1734 IEEE80211_STYPE_ACTION);
1735 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1736 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1737 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1738 memcpy(resp->u.action.u.sa_query.trans_id,
1739 mgmt->u.action.u.sa_query.trans_id,
1740 WLAN_SA_QUERY_TR_ID_LEN);
1742 ieee80211_tx_skb(sdata, skb, 1);
1745 static ieee80211_rx_result debug_noinline
1746 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1748 struct ieee80211_local *local = rx->local;
1749 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1750 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1751 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1752 struct ieee80211_bss *bss;
1753 int len = rx->skb->len;
1755 if (!ieee80211_is_action(mgmt->frame_control))
1759 return RX_DROP_MONITOR;
1761 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1762 return RX_DROP_MONITOR;
1764 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1765 return RX_DROP_MONITOR;
1767 /* all categories we currently handle have action_code */
1768 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1769 return RX_DROP_MONITOR;
1771 switch (mgmt->u.action.category) {
1772 case WLAN_CATEGORY_BACK:
1773 switch (mgmt->u.action.u.addba_req.action_code) {
1774 case WLAN_ACTION_ADDBA_REQ:
1775 if (len < (IEEE80211_MIN_ACTION_SIZE +
1776 sizeof(mgmt->u.action.u.addba_req)))
1777 return RX_DROP_MONITOR;
1778 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1780 case WLAN_ACTION_ADDBA_RESP:
1781 if (len < (IEEE80211_MIN_ACTION_SIZE +
1782 sizeof(mgmt->u.action.u.addba_resp)))
1783 return RX_DROP_MONITOR;
1784 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1786 case WLAN_ACTION_DELBA:
1787 if (len < (IEEE80211_MIN_ACTION_SIZE +
1788 sizeof(mgmt->u.action.u.delba)))
1789 return RX_DROP_MONITOR;
1790 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1794 case WLAN_CATEGORY_SPECTRUM_MGMT:
1795 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1796 return RX_DROP_MONITOR;
1797 switch (mgmt->u.action.u.measurement.action_code) {
1798 case WLAN_ACTION_SPCT_MSR_REQ:
1799 if (len < (IEEE80211_MIN_ACTION_SIZE +
1800 sizeof(mgmt->u.action.u.measurement)))
1801 return RX_DROP_MONITOR;
1802 ieee80211_process_measurement_req(sdata, mgmt, len);
1804 case WLAN_ACTION_SPCT_CHL_SWITCH:
1805 if (len < (IEEE80211_MIN_ACTION_SIZE +
1806 sizeof(mgmt->u.action.u.chan_switch)))
1807 return RX_DROP_MONITOR;
1809 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0)
1810 return RX_DROP_MONITOR;
1812 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1813 local->hw.conf.channel->center_freq,
1814 ifsta->ssid, ifsta->ssid_len);
1816 return RX_DROP_MONITOR;
1818 ieee80211_process_chanswitch(sdata,
1819 &mgmt->u.action.u.chan_switch.sw_elem, bss);
1820 ieee80211_rx_bss_put(local, bss);
1824 case WLAN_CATEGORY_SA_QUERY:
1825 if (len < (IEEE80211_MIN_ACTION_SIZE +
1826 sizeof(mgmt->u.action.u.sa_query)))
1827 return RX_DROP_MONITOR;
1828 switch (mgmt->u.action.u.sa_query.action) {
1829 case WLAN_ACTION_SA_QUERY_REQUEST:
1830 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1831 return RX_DROP_MONITOR;
1832 ieee80211_process_sa_query_req(sdata, mgmt, len);
1834 case WLAN_ACTION_SA_QUERY_RESPONSE:
1836 * SA Query response is currently only used in AP mode
1837 * and it is processed in user space.
1846 rx->sta->rx_packets++;
1847 dev_kfree_skb(rx->skb);
1851 static ieee80211_rx_result debug_noinline
1852 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1854 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1855 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1857 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1858 return RX_DROP_MONITOR;
1860 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1861 return RX_DROP_MONITOR;
1863 if (ieee80211_vif_is_mesh(&sdata->vif))
1864 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1866 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1867 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1868 return RX_DROP_MONITOR;
1870 if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)
1871 return RX_DROP_MONITOR;
1873 ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
1877 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1878 struct ieee80211_hdr *hdr,
1879 struct ieee80211_rx_data *rx)
1882 unsigned int hdrlen;
1884 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1885 if (rx->skb->len >= hdrlen + 4)
1886 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1892 * Some hardware seem to generate incorrect Michael MIC
1893 * reports; ignore them to avoid triggering countermeasures.
1898 if (!ieee80211_has_protected(hdr->frame_control))
1901 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1903 * APs with pairwise keys should never receive Michael MIC
1904 * errors for non-zero keyidx because these are reserved for
1905 * group keys and only the AP is sending real multicast
1906 * frames in the BSS.
1911 if (!ieee80211_is_data(hdr->frame_control) &&
1912 !ieee80211_is_auth(hdr->frame_control))
1915 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
1917 dev_kfree_skb(rx->skb);
1921 /* TODO: use IEEE80211_RX_FRAGMENTED */
1922 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1924 struct ieee80211_sub_if_data *sdata;
1925 struct ieee80211_local *local = rx->local;
1926 struct ieee80211_rtap_hdr {
1927 struct ieee80211_radiotap_header hdr;
1932 } __attribute__ ((packed)) *rthdr;
1933 struct sk_buff *skb = rx->skb, *skb2;
1934 struct net_device *prev_dev = NULL;
1935 struct ieee80211_rx_status *status = rx->status;
1937 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1940 if (skb_headroom(skb) < sizeof(*rthdr) &&
1941 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1944 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1945 memset(rthdr, 0, sizeof(*rthdr));
1946 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1947 rthdr->hdr.it_present =
1948 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1949 (1 << IEEE80211_RADIOTAP_RATE) |
1950 (1 << IEEE80211_RADIOTAP_CHANNEL));
1952 rthdr->rate = rx->rate->bitrate / 5;
1953 rthdr->chan_freq = cpu_to_le16(status->freq);
1955 if (status->band == IEEE80211_BAND_5GHZ)
1956 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1957 IEEE80211_CHAN_5GHZ);
1959 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1960 IEEE80211_CHAN_2GHZ);
1962 skb_set_mac_header(skb, 0);
1963 skb->ip_summed = CHECKSUM_UNNECESSARY;
1964 skb->pkt_type = PACKET_OTHERHOST;
1965 skb->protocol = htons(ETH_P_802_2);
1967 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1968 if (!netif_running(sdata->dev))
1971 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1972 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1976 skb2 = skb_clone(skb, GFP_ATOMIC);
1978 skb2->dev = prev_dev;
1983 prev_dev = sdata->dev;
1984 sdata->dev->stats.rx_packets++;
1985 sdata->dev->stats.rx_bytes += skb->len;
1989 skb->dev = prev_dev;
1995 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
2003 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
2004 struct ieee80211_rx_data *rx,
2005 struct sk_buff *skb)
2007 ieee80211_rx_result res = RX_DROP_MONITOR;
2011 rx->dev = sdata->dev;
2013 #define CALL_RXH(rxh) \
2016 if (res != RX_CONTINUE) \
2020 CALL_RXH(ieee80211_rx_h_passive_scan)
2021 CALL_RXH(ieee80211_rx_h_check)
2022 CALL_RXH(ieee80211_rx_h_decrypt)
2023 CALL_RXH(ieee80211_rx_h_check_more_data)
2024 CALL_RXH(ieee80211_rx_h_sta_process)
2025 CALL_RXH(ieee80211_rx_h_defragment)
2026 CALL_RXH(ieee80211_rx_h_ps_poll)
2027 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2028 /* must be after MMIC verify so header is counted in MPDU mic */
2029 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2030 CALL_RXH(ieee80211_rx_h_amsdu)
2031 #ifdef CONFIG_MAC80211_MESH
2032 if (ieee80211_vif_is_mesh(&sdata->vif))
2033 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2035 CALL_RXH(ieee80211_rx_h_data)
2036 CALL_RXH(ieee80211_rx_h_ctrl)
2037 CALL_RXH(ieee80211_rx_h_action)
2038 CALL_RXH(ieee80211_rx_h_mgmt)
2044 case RX_DROP_MONITOR:
2045 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2047 rx->sta->rx_dropped++;
2050 ieee80211_rx_cooked_monitor(rx);
2052 case RX_DROP_UNUSABLE:
2053 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2055 rx->sta->rx_dropped++;
2056 dev_kfree_skb(rx->skb);
2059 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2064 /* main receive path */
2066 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2067 u8 *bssid, struct ieee80211_rx_data *rx,
2068 struct ieee80211_hdr *hdr)
2070 int multicast = is_multicast_ether_addr(hdr->addr1);
2072 switch (sdata->vif.type) {
2073 case NL80211_IFTYPE_STATION:
2076 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
2077 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2079 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2080 } else if (!multicast &&
2081 compare_ether_addr(sdata->dev->dev_addr,
2083 if (!(sdata->dev->flags & IFF_PROMISC))
2085 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2088 case NL80211_IFTYPE_ADHOC:
2091 if (ieee80211_is_beacon(hdr->frame_control)) {
2094 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
2095 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2097 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2098 } else if (!multicast &&
2099 compare_ether_addr(sdata->dev->dev_addr,
2101 if (!(sdata->dev->flags & IFF_PROMISC))
2103 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2104 } else if (!rx->sta) {
2106 if (rx->status->flag & RX_FLAG_HT)
2107 rate_idx = 0; /* TODO: HT rates */
2109 rate_idx = rx->status->rate_idx;
2110 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2114 case NL80211_IFTYPE_MESH_POINT:
2116 compare_ether_addr(sdata->dev->dev_addr,
2118 if (!(sdata->dev->flags & IFF_PROMISC))
2121 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2124 case NL80211_IFTYPE_AP_VLAN:
2125 case NL80211_IFTYPE_AP:
2127 if (compare_ether_addr(sdata->dev->dev_addr,
2130 } else if (!ieee80211_bssid_match(bssid,
2131 sdata->dev->dev_addr)) {
2132 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2134 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2137 case NL80211_IFTYPE_WDS:
2138 if (bssid || !ieee80211_is_data(hdr->frame_control))
2140 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2143 case NL80211_IFTYPE_MONITOR:
2144 /* take everything */
2146 case NL80211_IFTYPE_UNSPECIFIED:
2147 case __NL80211_IFTYPE_AFTER_LAST:
2148 /* should never get here */
2157 * This is the actual Rx frames handler. as it blongs to Rx path it must
2158 * be called with rcu_read_lock protection.
2160 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2161 struct sk_buff *skb,
2162 struct ieee80211_rx_status *status,
2163 struct ieee80211_rate *rate)
2165 struct ieee80211_local *local = hw_to_local(hw);
2166 struct ieee80211_sub_if_data *sdata;
2167 struct ieee80211_hdr *hdr;
2168 struct ieee80211_rx_data rx;
2170 struct ieee80211_sub_if_data *prev = NULL;
2171 struct sk_buff *skb_new;
2174 hdr = (struct ieee80211_hdr *)skb->data;
2175 memset(&rx, 0, sizeof(rx));
2182 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2183 local->dot11ReceivedFragmentCount++;
2185 rx.sta = sta_info_get(local, hdr->addr2);
2187 rx.sdata = rx.sta->sdata;
2188 rx.dev = rx.sta->sdata->dev;
2191 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
2192 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
2196 if (unlikely(local->sw_scanning || local->hw_scanning))
2197 rx.flags |= IEEE80211_RX_IN_SCAN;
2199 ieee80211_parse_qos(&rx);
2200 ieee80211_verify_alignment(&rx);
2204 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2205 if (!netif_running(sdata->dev))
2208 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2211 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2212 rx.flags |= IEEE80211_RX_RA_MATCH;
2213 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
2219 * frame is destined for this interface, but if it's not
2220 * also for the previous one we handle that after the
2221 * loop to avoid copying the SKB once too much
2230 * frame was destined for the previous interface
2231 * so invoke RX handlers for it
2234 skb_new = skb_copy(skb, GFP_ATOMIC);
2236 if (net_ratelimit())
2237 printk(KERN_DEBUG "%s: failed to copy "
2238 "multicast frame for %s\n",
2239 wiphy_name(local->hw.wiphy),
2243 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2247 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2252 #define SEQ_MODULO 0x1000
2253 #define SEQ_MASK 0xfff
2255 static inline int seq_less(u16 sq1, u16 sq2)
2257 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2260 static inline u16 seq_inc(u16 sq)
2262 return (sq + 1) & SEQ_MASK;
2265 static inline u16 seq_sub(u16 sq1, u16 sq2)
2267 return (sq1 - sq2) & SEQ_MASK;
2272 * As it function blongs to Rx path it must be called with
2273 * the proper rcu_read_lock protection for its flow.
2275 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2276 struct tid_ampdu_rx *tid_agg_rx,
2277 struct sk_buff *skb,
2281 struct ieee80211_local *local = hw_to_local(hw);
2282 struct ieee80211_rx_status status;
2283 u16 head_seq_num, buf_size;
2285 struct ieee80211_supported_band *sband;
2286 struct ieee80211_rate *rate;
2288 buf_size = tid_agg_rx->buf_size;
2289 head_seq_num = tid_agg_rx->head_seq_num;
2291 /* frame with out of date sequence number */
2292 if (seq_less(mpdu_seq_num, head_seq_num)) {
2297 /* if frame sequence number exceeds our buffering window size or
2298 * block Ack Request arrived - release stored frames */
2299 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2300 /* new head to the ordering buffer */
2302 head_seq_num = mpdu_seq_num;
2305 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2306 /* release stored frames up to new head to stack */
2307 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2308 index = seq_sub(tid_agg_rx->head_seq_num,
2310 % tid_agg_rx->buf_size;
2312 if (tid_agg_rx->reorder_buf[index]) {
2313 /* release the reordered frames to stack */
2315 tid_agg_rx->reorder_buf[index]->cb,
2317 sband = local->hw.wiphy->bands[status.band];
2318 if (status.flag & RX_FLAG_HT) {
2319 /* TODO: HT rates */
2320 rate = sband->bitrates;
2322 rate = &sband->bitrates
2325 __ieee80211_rx_handle_packet(hw,
2326 tid_agg_rx->reorder_buf[index],
2328 tid_agg_rx->stored_mpdu_num--;
2329 tid_agg_rx->reorder_buf[index] = NULL;
2331 tid_agg_rx->head_seq_num =
2332 seq_inc(tid_agg_rx->head_seq_num);
2338 /* now the new frame is always in the range of the reordering */
2340 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2341 % tid_agg_rx->buf_size;
2342 /* check if we already stored this frame */
2343 if (tid_agg_rx->reorder_buf[index]) {
2348 /* if arrived mpdu is in the right order and nothing else stored */
2349 /* release it immediately */
2350 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2351 tid_agg_rx->stored_mpdu_num == 0) {
2352 tid_agg_rx->head_seq_num =
2353 seq_inc(tid_agg_rx->head_seq_num);
2357 /* put the frame in the reordering buffer */
2358 tid_agg_rx->reorder_buf[index] = skb;
2359 tid_agg_rx->stored_mpdu_num++;
2360 /* release the buffer until next missing frame */
2361 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2362 % tid_agg_rx->buf_size;
2363 while (tid_agg_rx->reorder_buf[index]) {
2364 /* release the reordered frame back to stack */
2365 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2367 sband = local->hw.wiphy->bands[status.band];
2368 if (status.flag & RX_FLAG_HT)
2369 rate = sband->bitrates; /* TODO: HT rates */
2371 rate = &sband->bitrates[status.rate_idx];
2372 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2374 tid_agg_rx->stored_mpdu_num--;
2375 tid_agg_rx->reorder_buf[index] = NULL;
2376 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2377 index = seq_sub(tid_agg_rx->head_seq_num,
2378 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2383 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2384 struct sk_buff *skb)
2386 struct ieee80211_hw *hw = &local->hw;
2387 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2388 struct sta_info *sta;
2389 struct tid_ampdu_rx *tid_agg_rx;
2395 sta = sta_info_get(local, hdr->addr2);
2399 /* filter the QoS data rx stream according to
2400 * STA/TID and check if this STA/TID is on aggregation */
2401 if (!ieee80211_is_data_qos(hdr->frame_control))
2404 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2406 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2409 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2411 /* qos null data frames are excluded */
2412 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2415 /* new un-ordered ampdu frame - process it */
2417 /* reset session timer */
2418 if (tid_agg_rx->timeout) {
2419 unsigned long expires =
2420 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2421 mod_timer(&tid_agg_rx->session_timer, expires);
2424 /* if this mpdu is fragmented - terminate rx aggregation session */
2425 sc = le16_to_cpu(hdr->seq_ctrl);
2426 if (sc & IEEE80211_SCTL_FRAG) {
2427 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2428 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2433 /* according to mpdu sequence number deal with reordering buffer */
2434 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2435 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2442 * This is the receive path handler. It is called by a low level driver when an
2443 * 802.11 MPDU is received from the hardware.
2445 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2446 struct ieee80211_rx_status *status)
2448 struct ieee80211_local *local = hw_to_local(hw);
2449 struct ieee80211_rate *rate = NULL;
2450 struct ieee80211_supported_band *sband;
2452 if (status->band < 0 ||
2453 status->band >= IEEE80211_NUM_BANDS) {
2458 sband = local->hw.wiphy->bands[status->band];
2464 if (status->flag & RX_FLAG_HT) {
2465 /* rate_idx is MCS index */
2466 if (WARN_ON(status->rate_idx < 0 ||
2467 status->rate_idx >= 76))
2469 /* HT rates are not in the table - use the highest legacy rate
2470 * for now since other parts of mac80211 may not yet be fully
2472 rate = &sband->bitrates[sband->n_bitrates - 1];
2474 if (WARN_ON(status->rate_idx < 0 ||
2475 status->rate_idx >= sband->n_bitrates))
2477 rate = &sband->bitrates[status->rate_idx];
2481 * key references and virtual interfaces are protected using RCU
2482 * and this requires that we are in a read-side RCU section during
2483 * receive processing
2488 * Frames with failed FCS/PLCP checksum are not returned,
2489 * all other frames are returned without radiotap header
2490 * if it was previously present.
2491 * Also, frames with less than 16 bytes are dropped.
2493 skb = ieee80211_rx_monitor(local, skb, status, rate);
2499 if (!ieee80211_rx_reorder_ampdu(local, skb))
2500 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2504 EXPORT_SYMBOL(__ieee80211_rx);
2506 /* This is a version of the rx handler that can be called from hard irq
2507 * context. Post the skb on the queue and schedule the tasklet */
2508 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2509 struct ieee80211_rx_status *status)
2511 struct ieee80211_local *local = hw_to_local(hw);
2513 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2515 skb->dev = local->mdev;
2516 /* copy status into skb->cb for use by tasklet */
2517 memcpy(skb->cb, status, sizeof(*status));
2518 skb->pkt_type = IEEE80211_RX_MSG;
2519 skb_queue_tail(&local->skb_queue, skb);
2520 tasklet_schedule(&local->tasklet);
2522 EXPORT_SYMBOL(ieee80211_rx_irqsafe);