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"
22 #include "driver-ops.h"
30 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
31 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,
43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
45 skb_trim(skb, skb->len - FCS_LEN);
57 static inline int should_drop_frame(struct sk_buff *skb,
60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
61 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
65 if (unlikely(skb->len < 16 + present_fcs_len))
67 if (ieee80211_is_ctl(hdr->frame_control) &&
68 !ieee80211_is_pspoll(hdr->frame_control) &&
69 !ieee80211_is_back_req(hdr->frame_control))
75 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
76 struct ieee80211_rx_status *status)
80 /* always present fields */
81 len = sizeof(struct ieee80211_radiotap_header) + 9;
83 if (status->flag & RX_FLAG_TSFT)
85 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
87 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
90 if (len & 1) /* padding for RX_FLAGS if necessary */
97 * ieee80211_add_rx_radiotap_header - add radiotap header
99 * add a radiotap header containing all the fields which the hardware provided.
102 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
104 struct ieee80211_rate *rate,
107 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
108 struct ieee80211_radiotap_header *rthdr;
112 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
113 memset(rthdr, 0, rtap_len);
115 /* radiotap header, set always present flags */
117 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
118 (1 << IEEE80211_RADIOTAP_CHANNEL) |
119 (1 << IEEE80211_RADIOTAP_ANTENNA) |
120 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
121 rthdr->it_len = cpu_to_le16(rtap_len);
123 pos = (unsigned char *)(rthdr+1);
125 /* the order of the following fields is important */
127 /* IEEE80211_RADIOTAP_TSFT */
128 if (status->flag & RX_FLAG_TSFT) {
129 put_unaligned_le64(status->mactime, pos);
131 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
135 /* IEEE80211_RADIOTAP_FLAGS */
136 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
137 *pos |= IEEE80211_RADIOTAP_F_FCS;
138 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
139 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
140 if (status->flag & RX_FLAG_SHORTPRE)
141 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
144 /* IEEE80211_RADIOTAP_RATE */
145 if (status->flag & RX_FLAG_HT) {
147 * TODO: add following information into radiotap header once
148 * suitable fields are defined for it:
149 * - MCS index (status->rate_idx)
150 * - HT40 (status->flag & RX_FLAG_40MHZ)
151 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
155 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
156 *pos = rate->bitrate / 5;
160 /* IEEE80211_RADIOTAP_CHANNEL */
161 put_unaligned_le16(status->freq, pos);
163 if (status->band == IEEE80211_BAND_5GHZ)
164 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
166 else if (status->flag & RX_FLAG_HT)
167 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
169 else if (rate->flags & IEEE80211_RATE_ERP_G)
170 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
173 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
177 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
178 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
179 *pos = status->signal;
181 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
185 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
186 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
187 *pos = status->noise;
189 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
193 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
195 /* IEEE80211_RADIOTAP_ANTENNA */
196 *pos = status->antenna;
199 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
201 /* IEEE80211_RADIOTAP_RX_FLAGS */
202 /* ensure 2 byte alignment for the 2 byte field as required */
203 if ((pos - (u8 *)rthdr) & 1)
205 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
206 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
207 put_unaligned_le16(rx_flags, pos);
212 * This function copies a received frame to all monitor interfaces and
213 * returns a cleaned-up SKB that no longer includes the FCS nor the
214 * radiotap header the driver might have added.
216 static struct sk_buff *
217 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
218 struct ieee80211_rate *rate)
220 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
221 struct ieee80211_sub_if_data *sdata;
222 int needed_headroom = 0;
223 struct sk_buff *skb, *skb2;
224 struct net_device *prev_dev = NULL;
225 int present_fcs_len = 0;
228 * First, we may need to make a copy of the skb because
229 * (1) we need to modify it for radiotap (if not present), and
230 * (2) the other RX handlers will modify the skb we got.
232 * We don't need to, of course, if we aren't going to return
233 * the SKB because it has a bad FCS/PLCP checksum.
236 /* room for the radiotap header based on driver features */
237 needed_headroom = ieee80211_rx_radiotap_len(local, status);
239 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
240 present_fcs_len = FCS_LEN;
242 if (!local->monitors) {
243 if (should_drop_frame(origskb, present_fcs_len)) {
244 dev_kfree_skb(origskb);
248 return remove_monitor_info(local, origskb);
251 if (should_drop_frame(origskb, present_fcs_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);
281 /* prepend radiotap information */
282 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
284 skb_reset_mac_header(skb);
285 skb->ip_summed = CHECKSUM_UNNECESSARY;
286 skb->pkt_type = PACKET_OTHERHOST;
287 skb->protocol = htons(ETH_P_802_2);
289 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
290 if (!netif_running(sdata->dev))
293 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
296 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
300 skb2 = skb_clone(skb, GFP_ATOMIC);
302 skb2->dev = prev_dev;
307 prev_dev = sdata->dev;
308 sdata->dev->stats.rx_packets++;
309 sdata->dev->stats.rx_bytes += skb->len;
322 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
324 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
327 /* does the frame have a qos control field? */
328 if (ieee80211_is_data_qos(hdr->frame_control)) {
329 u8 *qc = ieee80211_get_qos_ctl(hdr);
330 /* frame has qos control */
331 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
332 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
333 rx->flags |= IEEE80211_RX_AMSDU;
335 rx->flags &= ~IEEE80211_RX_AMSDU;
338 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
340 * Sequence numbers for management frames, QoS data
341 * frames with a broadcast/multicast address in the
342 * Address 1 field, and all non-QoS data frames sent
343 * by QoS STAs are assigned using an additional single
344 * modulo-4096 counter, [...]
346 * We also use that counter for non-QoS STAs.
348 tid = NUM_RX_DATA_QUEUES - 1;
352 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
353 * For now, set skb->priority to 0 for other cases. */
354 rx->skb->priority = (tid > 7) ? 0 : tid;
358 * DOC: Packet alignment
360 * Drivers always need to pass packets that are aligned to two-byte boundaries
363 * Additionally, should, if possible, align the payload data in a way that
364 * guarantees that the contained IP header is aligned to a four-byte
365 * boundary. In the case of regular frames, this simply means aligning the
366 * payload to a four-byte boundary (because either the IP header is directly
367 * contained, or IV/RFC1042 headers that have a length divisible by four are
370 * With A-MSDU frames, however, the payload data address must yield two modulo
371 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
372 * push the IP header further back to a multiple of four again. Thankfully, the
373 * specs were sane enough this time around to require padding each A-MSDU
374 * subframe to a length that is a multiple of four.
376 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
377 * the payload is not supported, the driver is required to move the 802.11
378 * header to be directly in front of the payload in that case.
380 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
382 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
385 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
389 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
390 "unaligned packet at 0x%p\n", rx->skb->data))
393 if (!ieee80211_is_data_present(hdr->frame_control))
396 hdrlen = ieee80211_hdrlen(hdr->frame_control);
397 if (rx->flags & IEEE80211_RX_AMSDU)
399 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
400 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
406 static ieee80211_rx_result debug_noinline
407 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
409 struct ieee80211_local *local = rx->local;
410 struct sk_buff *skb = rx->skb;
412 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
413 return ieee80211_scan_rx(rx->sdata, skb);
415 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
416 (rx->flags & IEEE80211_RX_IN_SCAN))) {
417 /* drop all the other packets during a software scan anyway */
418 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
423 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
424 /* scanning finished during invoking of handlers */
425 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
426 return RX_DROP_UNUSABLE;
433 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
435 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
437 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
440 return ieee80211_is_robust_mgmt_frame(hdr);
444 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
446 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
448 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
451 return ieee80211_is_robust_mgmt_frame(hdr);
455 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
456 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
458 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
459 struct ieee80211_mmie *mmie;
461 if (skb->len < 24 + sizeof(*mmie) ||
462 !is_multicast_ether_addr(hdr->da))
465 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
466 return -1; /* not a robust management frame */
468 mmie = (struct ieee80211_mmie *)
469 (skb->data + skb->len - sizeof(*mmie));
470 if (mmie->element_id != WLAN_EID_MMIE ||
471 mmie->length != sizeof(*mmie) - 2)
474 return le16_to_cpu(mmie->key_id);
478 static ieee80211_rx_result
479 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
481 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
482 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
483 char *dev_addr = rx->sdata->dev->dev_addr;
485 if (ieee80211_is_data(hdr->frame_control)) {
486 if (is_multicast_ether_addr(hdr->addr1)) {
487 if (ieee80211_has_tods(hdr->frame_control) ||
488 !ieee80211_has_fromds(hdr->frame_control))
489 return RX_DROP_MONITOR;
490 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
491 return RX_DROP_MONITOR;
493 if (!ieee80211_has_a4(hdr->frame_control))
494 return RX_DROP_MONITOR;
495 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
496 return RX_DROP_MONITOR;
500 /* If there is not an established peer link and this is not a peer link
501 * establisment frame, beacon or probe, drop the frame.
504 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
505 struct ieee80211_mgmt *mgmt;
507 if (!ieee80211_is_mgmt(hdr->frame_control))
508 return RX_DROP_MONITOR;
510 if (ieee80211_is_action(hdr->frame_control)) {
511 mgmt = (struct ieee80211_mgmt *)hdr;
512 if (mgmt->u.action.category != MESH_PLINK_CATEGORY)
513 return RX_DROP_MONITOR;
517 if (ieee80211_is_probe_req(hdr->frame_control) ||
518 ieee80211_is_probe_resp(hdr->frame_control) ||
519 ieee80211_is_beacon(hdr->frame_control))
522 return RX_DROP_MONITOR;
526 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
528 if (ieee80211_is_data(hdr->frame_control) &&
529 is_multicast_ether_addr(hdr->addr1) &&
530 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
531 return RX_DROP_MONITOR;
538 static ieee80211_rx_result debug_noinline
539 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
541 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
543 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
544 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
545 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
546 rx->sta->last_seq_ctrl[rx->queue] ==
548 if (rx->flags & IEEE80211_RX_RA_MATCH) {
549 rx->local->dot11FrameDuplicateCount++;
550 rx->sta->num_duplicates++;
552 return RX_DROP_MONITOR;
554 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
557 if (unlikely(rx->skb->len < 16)) {
558 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
559 return RX_DROP_MONITOR;
562 /* Drop disallowed frame classes based on STA auth/assoc state;
563 * IEEE 802.11, Chap 5.5.
565 * mac80211 filters only based on association state, i.e. it drops
566 * Class 3 frames from not associated stations. hostapd sends
567 * deauth/disassoc frames when needed. In addition, hostapd is
568 * responsible for filtering on both auth and assoc states.
571 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
572 return ieee80211_rx_mesh_check(rx);
574 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
575 ieee80211_is_pspoll(hdr->frame_control)) &&
576 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
577 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
578 if ((!ieee80211_has_fromds(hdr->frame_control) &&
579 !ieee80211_has_tods(hdr->frame_control) &&
580 ieee80211_is_data(hdr->frame_control)) ||
581 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
582 /* Drop IBSS frames and frames for other hosts
584 return RX_DROP_MONITOR;
587 return RX_DROP_MONITOR;
594 static ieee80211_rx_result debug_noinline
595 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
597 struct sk_buff *skb = rx->skb;
598 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
599 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
602 ieee80211_rx_result result = RX_DROP_UNUSABLE;
603 struct ieee80211_key *stakey = NULL;
604 int mmie_keyidx = -1;
609 * There are four types of keys:
611 * - IGTK (group keys for management frames)
612 * - PTK (pairwise keys)
613 * - STK (station-to-station pairwise keys)
615 * When selecting a key, we have to distinguish between multicast
616 * (including broadcast) and unicast frames, the latter can only
617 * use PTKs and STKs while the former always use GTKs and IGTKs.
618 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
619 * unicast frames can also use key indices like GTKs. Hence, if we
620 * don't have a PTK/STK we check the key index for a WEP key.
622 * Note that in a regular BSS, multicast frames are sent by the
623 * AP only, associated stations unicast the frame to the AP first
624 * which then multicasts it on their behalf.
626 * There is also a slight problem in IBSS mode: GTKs are negotiated
627 * with each station, that is something we don't currently handle.
628 * The spec seems to expect that one negotiates the same key with
629 * every station but there's no such requirement; VLANs could be
634 * No point in finding a key and decrypting if the frame is neither
635 * addressed to us nor a multicast frame.
637 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
641 stakey = rcu_dereference(rx->sta->key);
643 if (!ieee80211_has_protected(hdr->frame_control))
644 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
646 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
648 /* Skip decryption if the frame is not protected. */
649 if (!ieee80211_has_protected(hdr->frame_control))
651 } else if (mmie_keyidx >= 0) {
652 /* Broadcast/multicast robust management frame / BIP */
653 if ((status->flag & RX_FLAG_DECRYPTED) &&
654 (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]);
661 } else if (!ieee80211_has_protected(hdr->frame_control)) {
663 * The frame was not protected, so skip decryption. However, we
664 * need to set rx->key if there is a key that could have been
665 * used so that the frame may be dropped if encryption would
666 * have been expected.
668 struct ieee80211_key *key = NULL;
669 if (ieee80211_is_mgmt(hdr->frame_control) &&
670 is_multicast_ether_addr(hdr->addr1) &&
671 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
673 else if ((key = rcu_dereference(rx->sdata->default_key)))
678 * The device doesn't give us the IV so we won't be
679 * able to look up the key. That's ok though, we
680 * don't need to decrypt the frame, we just won't
681 * be able to keep statistics accurate.
682 * Except for key threshold notifications, should
683 * we somehow allow the driver to tell us which key
684 * the hardware used if this flag is set?
686 if ((status->flag & RX_FLAG_DECRYPTED) &&
687 (status->flag & RX_FLAG_IV_STRIPPED))
690 hdrlen = ieee80211_hdrlen(hdr->frame_control);
692 if (rx->skb->len < 8 + hdrlen)
693 return RX_DROP_UNUSABLE; /* TODO: count this? */
696 * no need to call ieee80211_wep_get_keyidx,
697 * it verifies a bunch of things we've done already
699 keyidx = rx->skb->data[hdrlen + 3] >> 6;
701 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
704 * RSNA-protected unicast frames should always be sent with
705 * pairwise or station-to-station keys, but for WEP we allow
706 * using a key index as well.
708 if (rx->key && rx->key->conf.alg != ALG_WEP &&
709 !is_multicast_ether_addr(hdr->addr1))
714 rx->key->tx_rx_count++;
715 /* TODO: add threshold stuff again */
717 return RX_DROP_MONITOR;
720 /* Check for weak IVs if possible */
721 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
722 ieee80211_is_data(hdr->frame_control) &&
723 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
724 !(status->flag & RX_FLAG_DECRYPTED)) &&
725 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
726 rx->sta->wep_weak_iv_count++;
728 switch (rx->key->conf.alg) {
730 result = ieee80211_crypto_wep_decrypt(rx);
733 result = ieee80211_crypto_tkip_decrypt(rx);
736 result = ieee80211_crypto_ccmp_decrypt(rx);
739 result = ieee80211_crypto_aes_cmac_decrypt(rx);
743 /* either the frame has been decrypted or will be dropped */
744 status->flag |= RX_FLAG_DECRYPTED;
749 static ieee80211_rx_result debug_noinline
750 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
752 struct ieee80211_local *local;
753 struct ieee80211_hdr *hdr;
758 hdr = (struct ieee80211_hdr *) skb->data;
760 if (!local->pspolling)
763 if (!ieee80211_has_fromds(hdr->frame_control))
764 /* this is not from AP */
767 if (!ieee80211_is_data(hdr->frame_control))
770 if (!ieee80211_has_moredata(hdr->frame_control)) {
771 /* AP has no more frames buffered for us */
772 local->pspolling = false;
776 /* more data bit is set, let's request a new frame from the AP */
777 ieee80211_send_pspoll(local, rx->sdata);
782 static void ap_sta_ps_start(struct sta_info *sta)
784 struct ieee80211_sub_if_data *sdata = sta->sdata;
785 struct ieee80211_local *local = sdata->local;
787 atomic_inc(&sdata->bss->num_sta_ps);
788 set_sta_flags(sta, WLAN_STA_PS_STA);
789 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
790 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
791 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
792 sdata->dev->name, sta->sta.addr, sta->sta.aid);
793 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
796 static void ap_sta_ps_end(struct sta_info *sta)
798 struct ieee80211_sub_if_data *sdata = sta->sdata;
800 atomic_dec(&sdata->bss->num_sta_ps);
802 clear_sta_flags(sta, WLAN_STA_PS_STA);
804 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
805 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
806 sdata->dev->name, sta->sta.addr, sta->sta.aid);
807 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
809 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
810 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
811 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
812 sdata->dev->name, sta->sta.addr, sta->sta.aid);
813 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
817 ieee80211_sta_ps_deliver_wakeup(sta);
820 static ieee80211_rx_result debug_noinline
821 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
823 struct sta_info *sta = rx->sta;
824 struct sk_buff *skb = rx->skb;
825 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
826 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
832 * Update last_rx only for IBSS packets which are for the current
833 * BSSID to avoid keeping the current IBSS network alive in cases
834 * where other STAs start using different BSSID.
836 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
837 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
838 NL80211_IFTYPE_ADHOC);
839 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
840 sta->last_rx = jiffies;
841 } else if (!is_multicast_ether_addr(hdr->addr1)) {
843 * Mesh beacons will update last_rx when if they are found to
844 * match the current local configuration when processed.
846 sta->last_rx = jiffies;
849 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
852 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
853 ieee80211_sta_rx_notify(rx->sdata, hdr);
856 sta->rx_bytes += rx->skb->len;
857 sta->last_signal = status->signal;
858 sta->last_noise = status->noise;
861 * Change STA power saving mode only at the end of a frame
864 if (!ieee80211_has_morefrags(hdr->frame_control) &&
865 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
866 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
867 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
869 * Ignore doze->wake transitions that are
870 * indicated by non-data frames, the standard
871 * is unclear here, but for example going to
872 * PS mode and then scanning would cause a
873 * doze->wake transition for the probe request,
874 * and that is clearly undesirable.
876 if (ieee80211_is_data(hdr->frame_control) &&
877 !ieee80211_has_pm(hdr->frame_control))
880 if (ieee80211_has_pm(hdr->frame_control))
881 ap_sta_ps_start(sta);
886 * Drop (qos-)data::nullfunc frames silently, since they
887 * are used only to control station power saving mode.
889 if (ieee80211_is_nullfunc(hdr->frame_control) ||
890 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
891 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
893 * Update counter and free packet here to avoid
894 * counting this as a dropped packed.
897 dev_kfree_skb(rx->skb);
902 } /* ieee80211_rx_h_sta_process */
904 static inline struct ieee80211_fragment_entry *
905 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
906 unsigned int frag, unsigned int seq, int rx_queue,
907 struct sk_buff **skb)
909 struct ieee80211_fragment_entry *entry;
912 idx = sdata->fragment_next;
913 entry = &sdata->fragments[sdata->fragment_next++];
914 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
915 sdata->fragment_next = 0;
917 if (!skb_queue_empty(&entry->skb_list)) {
918 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
919 struct ieee80211_hdr *hdr =
920 (struct ieee80211_hdr *) entry->skb_list.next->data;
921 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
922 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
923 "addr1=%pM addr2=%pM\n",
924 sdata->dev->name, idx,
925 jiffies - entry->first_frag_time, entry->seq,
926 entry->last_frag, hdr->addr1, hdr->addr2);
928 __skb_queue_purge(&entry->skb_list);
931 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
933 entry->first_frag_time = jiffies;
935 entry->rx_queue = rx_queue;
936 entry->last_frag = frag;
938 entry->extra_len = 0;
943 static inline struct ieee80211_fragment_entry *
944 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
945 unsigned int frag, unsigned int seq,
946 int rx_queue, struct ieee80211_hdr *hdr)
948 struct ieee80211_fragment_entry *entry;
951 idx = sdata->fragment_next;
952 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
953 struct ieee80211_hdr *f_hdr;
957 idx = IEEE80211_FRAGMENT_MAX - 1;
959 entry = &sdata->fragments[idx];
960 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
961 entry->rx_queue != rx_queue ||
962 entry->last_frag + 1 != frag)
965 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
968 * Check ftype and addresses are equal, else check next fragment
970 if (((hdr->frame_control ^ f_hdr->frame_control) &
971 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
972 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
973 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
976 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
977 __skb_queue_purge(&entry->skb_list);
986 static ieee80211_rx_result debug_noinline
987 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
989 struct ieee80211_hdr *hdr;
992 unsigned int frag, seq;
993 struct ieee80211_fragment_entry *entry;
996 hdr = (struct ieee80211_hdr *)rx->skb->data;
997 fc = hdr->frame_control;
998 sc = le16_to_cpu(hdr->seq_ctrl);
999 frag = sc & IEEE80211_SCTL_FRAG;
1001 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1002 (rx->skb)->len < 24 ||
1003 is_multicast_ether_addr(hdr->addr1))) {
1004 /* not fragmented */
1007 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1009 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1012 /* This is the first fragment of a new frame. */
1013 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1014 rx->queue, &(rx->skb));
1015 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1016 ieee80211_has_protected(fc)) {
1017 /* Store CCMP PN so that we can verify that the next
1018 * fragment has a sequential PN value. */
1020 memcpy(entry->last_pn,
1021 rx->key->u.ccmp.rx_pn[rx->queue],
1027 /* This is a fragment for a frame that should already be pending in
1028 * fragment cache. Add this fragment to the end of the pending entry.
1030 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1032 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1033 return RX_DROP_MONITOR;
1036 /* Verify that MPDUs within one MSDU have sequential PN values.
1037 * (IEEE 802.11i, 8.3.3.4.5) */
1040 u8 pn[CCMP_PN_LEN], *rpn;
1041 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1042 return RX_DROP_UNUSABLE;
1043 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1044 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1049 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1050 if (memcmp(pn, rpn, CCMP_PN_LEN))
1051 return RX_DROP_UNUSABLE;
1052 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1055 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1056 __skb_queue_tail(&entry->skb_list, rx->skb);
1057 entry->last_frag = frag;
1058 entry->extra_len += rx->skb->len;
1059 if (ieee80211_has_morefrags(fc)) {
1064 rx->skb = __skb_dequeue(&entry->skb_list);
1065 if (skb_tailroom(rx->skb) < entry->extra_len) {
1066 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1067 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1069 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1070 __skb_queue_purge(&entry->skb_list);
1071 return RX_DROP_UNUSABLE;
1074 while ((skb = __skb_dequeue(&entry->skb_list))) {
1075 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1079 /* Complete frame has been reassembled - process it now */
1080 rx->flags |= IEEE80211_RX_FRAGMENTED;
1084 rx->sta->rx_packets++;
1085 if (is_multicast_ether_addr(hdr->addr1))
1086 rx->local->dot11MulticastReceivedFrameCount++;
1088 ieee80211_led_rx(rx->local);
1092 static ieee80211_rx_result debug_noinline
1093 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1095 struct ieee80211_sub_if_data *sdata = rx->sdata;
1096 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1098 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1099 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1102 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1103 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1104 return RX_DROP_UNUSABLE;
1106 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1107 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1109 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1111 /* Free PS Poll skb here instead of returning RX_DROP that would
1112 * count as an dropped frame. */
1113 dev_kfree_skb(rx->skb);
1118 static ieee80211_rx_result debug_noinline
1119 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1121 u8 *data = rx->skb->data;
1122 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1124 if (!ieee80211_is_data_qos(hdr->frame_control))
1127 /* remove the qos control field, update frame type and meta-data */
1128 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1129 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1130 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1131 /* change frame type to non QOS */
1132 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1138 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1140 if (unlikely(!rx->sta ||
1141 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1148 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1150 struct sk_buff *skb = rx->skb;
1151 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1154 * Pass through unencrypted frames if the hardware has
1155 * decrypted them already.
1157 if (status->flag & RX_FLAG_DECRYPTED)
1160 /* Drop unencrypted frames if key is set. */
1161 if (unlikely(!ieee80211_has_protected(fc) &&
1162 !ieee80211_is_nullfunc(fc) &&
1163 ieee80211_is_data(fc) &&
1164 (rx->key || rx->sdata->drop_unencrypted)))
1166 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1167 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1170 /* BIP does not use Protected field, so need to check MMIE */
1171 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1172 ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1176 * When using MFP, Action frames are not allowed prior to
1177 * having configured keys.
1179 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1180 ieee80211_is_robust_mgmt_frame(
1181 (struct ieee80211_hdr *) rx->skb->data)))
1189 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1191 struct ieee80211_sub_if_data *sdata = rx->sdata;
1192 struct net_device *dev = sdata->dev;
1193 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1195 if (ieee80211_has_a4(hdr->frame_control) &&
1196 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1199 if (is_multicast_ether_addr(hdr->addr1) &&
1200 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1201 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
1204 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
1208 * requires that rx->skb is a frame with ethernet header
1210 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1212 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1213 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1214 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1217 * Allow EAPOL frames to us/the PAE group address regardless
1218 * of whether the frame was encrypted or not.
1220 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1221 (compare_ether_addr(ehdr->h_dest, rx->sdata->dev->dev_addr) == 0 ||
1222 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1225 if (ieee80211_802_1x_port_control(rx) ||
1226 ieee80211_drop_unencrypted(rx, fc))
1233 * requires that rx->skb is a frame with ethernet header
1236 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1238 struct ieee80211_sub_if_data *sdata = rx->sdata;
1239 struct net_device *dev = sdata->dev;
1240 struct ieee80211_local *local = rx->local;
1241 struct sk_buff *skb, *xmit_skb;
1242 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1243 struct sta_info *dsta;
1248 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1249 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1250 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1251 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1252 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1253 if (is_multicast_ether_addr(ehdr->h_dest)) {
1255 * send multicast frames both to higher layers in
1256 * local net stack and back to the wireless medium
1258 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1259 if (!xmit_skb && net_ratelimit())
1260 printk(KERN_DEBUG "%s: failed to clone "
1261 "multicast frame\n", dev->name);
1263 dsta = sta_info_get(local, skb->data);
1264 if (dsta && dsta->sdata->dev == dev) {
1266 * The destination station is associated to
1267 * this AP (in this VLAN), so send the frame
1268 * directly to it and do not pass it to local
1278 int align __maybe_unused;
1280 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1282 * 'align' will only take the values 0 or 2 here
1283 * since all frames are required to be aligned
1284 * to 2-byte boundaries when being passed to
1285 * mac80211. That also explains the __skb_push()
1288 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1290 if (WARN_ON(skb_headroom(skb) < 3)) {
1294 u8 *data = skb->data;
1295 size_t len = skb_headlen(skb);
1297 memmove(skb->data, data, len);
1298 skb_set_tail_pointer(skb, len);
1304 /* deliver to local stack */
1305 skb->protocol = eth_type_trans(skb, dev);
1306 memset(skb->cb, 0, sizeof(skb->cb));
1312 /* send to wireless media */
1313 xmit_skb->protocol = htons(ETH_P_802_3);
1314 skb_reset_network_header(xmit_skb);
1315 skb_reset_mac_header(xmit_skb);
1316 dev_queue_xmit(xmit_skb);
1320 static ieee80211_rx_result debug_noinline
1321 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1323 struct net_device *dev = rx->sdata->dev;
1324 struct ieee80211_local *local = rx->local;
1327 struct sk_buff *skb = rx->skb, *frame = NULL;
1328 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1329 __le16 fc = hdr->frame_control;
1330 const struct ethhdr *eth;
1335 if (unlikely(!ieee80211_is_data(fc)))
1338 if (unlikely(!ieee80211_is_data_present(fc)))
1339 return RX_DROP_MONITOR;
1341 if (!(rx->flags & IEEE80211_RX_AMSDU))
1344 err = __ieee80211_data_to_8023(rx);
1346 return RX_DROP_UNUSABLE;
1350 dev->stats.rx_packets++;
1351 dev->stats.rx_bytes += skb->len;
1353 /* skip the wrapping header */
1354 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1356 return RX_DROP_UNUSABLE;
1358 while (skb != frame) {
1360 __be16 len = eth->h_proto;
1361 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1363 remaining = skb->len;
1364 memcpy(dst, eth->h_dest, ETH_ALEN);
1365 memcpy(src, eth->h_source, ETH_ALEN);
1367 padding = ((4 - subframe_len) & 0x3);
1368 /* the last MSDU has no padding */
1369 if (subframe_len > remaining)
1370 return RX_DROP_UNUSABLE;
1372 skb_pull(skb, sizeof(struct ethhdr));
1373 /* if last subframe reuse skb */
1374 if (remaining <= subframe_len + padding)
1378 * Allocate and reserve two bytes more for payload
1379 * alignment since sizeof(struct ethhdr) is 14.
1381 frame = dev_alloc_skb(
1382 ALIGN(local->hw.extra_tx_headroom, 4) +
1386 return RX_DROP_UNUSABLE;
1389 ALIGN(local->hw.extra_tx_headroom, 4) +
1390 sizeof(struct ethhdr) + 2);
1391 memcpy(skb_put(frame, ntohs(len)), skb->data,
1394 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1397 dev_kfree_skb(frame);
1398 return RX_DROP_UNUSABLE;
1402 skb_reset_network_header(frame);
1404 frame->priority = skb->priority;
1407 payload = frame->data;
1408 ethertype = (payload[6] << 8) | payload[7];
1410 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1411 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1412 compare_ether_addr(payload,
1413 bridge_tunnel_header) == 0)) {
1414 /* remove RFC1042 or Bridge-Tunnel
1415 * encapsulation and replace EtherType */
1417 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1418 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1420 memcpy(skb_push(frame, sizeof(__be16)),
1421 &len, sizeof(__be16));
1422 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1423 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1426 if (!ieee80211_frame_allowed(rx, fc)) {
1427 if (skb == frame) /* last frame */
1428 return RX_DROP_UNUSABLE;
1429 dev_kfree_skb(frame);
1433 ieee80211_deliver_skb(rx);
1439 #ifdef CONFIG_MAC80211_MESH
1440 static ieee80211_rx_result
1441 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1443 struct ieee80211_hdr *hdr;
1444 struct ieee80211s_hdr *mesh_hdr;
1445 unsigned int hdrlen;
1446 struct sk_buff *skb = rx->skb, *fwd_skb;
1447 struct ieee80211_local *local = rx->local;
1448 struct ieee80211_sub_if_data *sdata = rx->sdata;
1450 hdr = (struct ieee80211_hdr *) skb->data;
1451 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1452 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1454 if (!ieee80211_is_data(hdr->frame_control))
1459 return RX_DROP_MONITOR;
1461 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1462 struct mesh_path *mppath;
1466 if (is_multicast_ether_addr(hdr->addr1)) {
1467 mpp_addr = hdr->addr3;
1468 proxied_addr = mesh_hdr->eaddr1;
1470 mpp_addr = hdr->addr4;
1471 proxied_addr = mesh_hdr->eaddr2;
1475 mppath = mpp_path_lookup(proxied_addr, sdata);
1477 mpp_path_add(proxied_addr, mpp_addr, sdata);
1479 spin_lock_bh(&mppath->state_lock);
1480 mppath->exp_time = jiffies;
1481 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1482 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1483 spin_unlock_bh(&mppath->state_lock);
1488 /* Frame has reached destination. Don't forward */
1489 if (!is_multicast_ether_addr(hdr->addr1) &&
1490 compare_ether_addr(sdata->dev->dev_addr, hdr->addr3) == 0)
1495 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1497 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1498 dropped_frames_ttl);
1500 struct ieee80211_hdr *fwd_hdr;
1501 struct ieee80211_tx_info *info;
1503 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1505 if (!fwd_skb && net_ratelimit())
1506 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1509 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1510 memcpy(fwd_hdr->addr2, sdata->dev->dev_addr, ETH_ALEN);
1511 info = IEEE80211_SKB_CB(fwd_skb);
1512 memset(info, 0, sizeof(*info));
1513 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1514 info->control.vif = &rx->sdata->vif;
1515 ieee80211_select_queue(local, fwd_skb);
1516 if (is_multicast_ether_addr(fwd_hdr->addr1))
1517 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1522 * Save TA to addr1 to send TA a path error if a
1523 * suitable next hop is not found
1525 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1527 err = mesh_nexthop_lookup(fwd_skb, sdata);
1528 /* Failed to immediately resolve next hop:
1529 * fwded frame was dropped or will be added
1530 * later to the pending skb queue. */
1532 return RX_DROP_MONITOR;
1534 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1537 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1539 ieee80211_add_pending_skb(local, fwd_skb);
1543 if (is_multicast_ether_addr(hdr->addr1) ||
1544 sdata->dev->flags & IFF_PROMISC)
1547 return RX_DROP_MONITOR;
1551 static ieee80211_rx_result debug_noinline
1552 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1554 struct ieee80211_sub_if_data *sdata = rx->sdata;
1555 struct net_device *dev = sdata->dev;
1556 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1557 __le16 fc = hdr->frame_control;
1560 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1563 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1564 return RX_DROP_MONITOR;
1567 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1568 * that a 4-addr station can be detected and moved into a separate VLAN
1570 if (ieee80211_has_a4(hdr->frame_control) &&
1571 sdata->vif.type == NL80211_IFTYPE_AP)
1572 return RX_DROP_MONITOR;
1574 err = __ieee80211_data_to_8023(rx);
1576 return RX_DROP_UNUSABLE;
1578 if (!ieee80211_frame_allowed(rx, fc))
1579 return RX_DROP_MONITOR;
1583 dev->stats.rx_packets++;
1584 dev->stats.rx_bytes += rx->skb->len;
1586 ieee80211_deliver_skb(rx);
1591 static ieee80211_rx_result debug_noinline
1592 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1594 struct ieee80211_local *local = rx->local;
1595 struct ieee80211_hw *hw = &local->hw;
1596 struct sk_buff *skb = rx->skb;
1597 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1598 struct tid_ampdu_rx *tid_agg_rx;
1602 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1605 if (ieee80211_is_back_req(bar->frame_control)) {
1607 return RX_DROP_MONITOR;
1608 tid = le16_to_cpu(bar->control) >> 12;
1609 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1610 != HT_AGG_STATE_OPERATIONAL)
1611 return RX_DROP_MONITOR;
1612 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1614 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1616 /* reset session timer */
1617 if (tid_agg_rx->timeout)
1618 mod_timer(&tid_agg_rx->session_timer,
1619 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1621 /* release stored frames up to start of BAR */
1622 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
1630 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1631 struct ieee80211_mgmt *mgmt,
1634 struct ieee80211_local *local = sdata->local;
1635 struct sk_buff *skb;
1636 struct ieee80211_mgmt *resp;
1638 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1639 /* Not to own unicast address */
1643 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1644 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1645 /* Not from the current AP or not associated yet. */
1649 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1650 /* Too short SA Query request frame */
1654 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1658 skb_reserve(skb, local->hw.extra_tx_headroom);
1659 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1660 memset(resp, 0, 24);
1661 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1662 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1663 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1664 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1665 IEEE80211_STYPE_ACTION);
1666 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1667 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1668 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1669 memcpy(resp->u.action.u.sa_query.trans_id,
1670 mgmt->u.action.u.sa_query.trans_id,
1671 WLAN_SA_QUERY_TR_ID_LEN);
1673 ieee80211_tx_skb(sdata, skb);
1676 static ieee80211_rx_result debug_noinline
1677 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1679 struct ieee80211_local *local = rx->local;
1680 struct ieee80211_sub_if_data *sdata = rx->sdata;
1681 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1682 int len = rx->skb->len;
1684 if (!ieee80211_is_action(mgmt->frame_control))
1688 return RX_DROP_MONITOR;
1690 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1691 return RX_DROP_MONITOR;
1693 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1694 return RX_DROP_MONITOR;
1696 /* all categories we currently handle have action_code */
1697 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1698 return RX_DROP_MONITOR;
1700 switch (mgmt->u.action.category) {
1701 case WLAN_CATEGORY_BACK:
1703 * The aggregation code is not prepared to handle
1704 * anything but STA/AP due to the BSSID handling;
1705 * IBSS could work in the code but isn't supported
1706 * by drivers or the standard.
1708 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1709 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1710 sdata->vif.type != NL80211_IFTYPE_AP)
1711 return RX_DROP_MONITOR;
1713 switch (mgmt->u.action.u.addba_req.action_code) {
1714 case WLAN_ACTION_ADDBA_REQ:
1715 if (len < (IEEE80211_MIN_ACTION_SIZE +
1716 sizeof(mgmt->u.action.u.addba_req)))
1717 return RX_DROP_MONITOR;
1718 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1720 case WLAN_ACTION_ADDBA_RESP:
1721 if (len < (IEEE80211_MIN_ACTION_SIZE +
1722 sizeof(mgmt->u.action.u.addba_resp)))
1723 return RX_DROP_MONITOR;
1724 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1726 case WLAN_ACTION_DELBA:
1727 if (len < (IEEE80211_MIN_ACTION_SIZE +
1728 sizeof(mgmt->u.action.u.delba)))
1729 return RX_DROP_MONITOR;
1730 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1734 case WLAN_CATEGORY_SPECTRUM_MGMT:
1735 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1736 return RX_DROP_MONITOR;
1738 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1739 return RX_DROP_MONITOR;
1741 switch (mgmt->u.action.u.measurement.action_code) {
1742 case WLAN_ACTION_SPCT_MSR_REQ:
1743 if (len < (IEEE80211_MIN_ACTION_SIZE +
1744 sizeof(mgmt->u.action.u.measurement)))
1745 return RX_DROP_MONITOR;
1746 ieee80211_process_measurement_req(sdata, mgmt, len);
1748 case WLAN_ACTION_SPCT_CHL_SWITCH:
1749 if (len < (IEEE80211_MIN_ACTION_SIZE +
1750 sizeof(mgmt->u.action.u.chan_switch)))
1751 return RX_DROP_MONITOR;
1753 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1754 return RX_DROP_MONITOR;
1756 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1757 return RX_DROP_MONITOR;
1759 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1762 case WLAN_CATEGORY_SA_QUERY:
1763 if (len < (IEEE80211_MIN_ACTION_SIZE +
1764 sizeof(mgmt->u.action.u.sa_query)))
1765 return RX_DROP_MONITOR;
1766 switch (mgmt->u.action.u.sa_query.action) {
1767 case WLAN_ACTION_SA_QUERY_REQUEST:
1768 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1769 return RX_DROP_MONITOR;
1770 ieee80211_process_sa_query_req(sdata, mgmt, len);
1772 case WLAN_ACTION_SA_QUERY_RESPONSE:
1774 * SA Query response is currently only used in AP mode
1775 * and it is processed in user space.
1784 rx->sta->rx_packets++;
1785 dev_kfree_skb(rx->skb);
1789 static ieee80211_rx_result debug_noinline
1790 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1792 struct ieee80211_sub_if_data *sdata = rx->sdata;
1793 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1795 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1796 return RX_DROP_MONITOR;
1798 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1799 return RX_DROP_MONITOR;
1801 if (ieee80211_vif_is_mesh(&sdata->vif))
1802 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
1804 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
1805 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
1807 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1808 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1810 return RX_DROP_MONITOR;
1813 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
1814 struct ieee80211_rx_data *rx)
1817 unsigned int hdrlen;
1819 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1820 if (rx->skb->len >= hdrlen + 4)
1821 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1827 * Some hardware seem to generate incorrect Michael MIC
1828 * reports; ignore them to avoid triggering countermeasures.
1833 if (!ieee80211_has_protected(hdr->frame_control))
1836 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1838 * APs with pairwise keys should never receive Michael MIC
1839 * errors for non-zero keyidx because these are reserved for
1840 * group keys and only the AP is sending real multicast
1841 * frames in the BSS.
1846 if (!ieee80211_is_data(hdr->frame_control) &&
1847 !ieee80211_is_auth(hdr->frame_control))
1850 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1854 /* TODO: use IEEE80211_RX_FRAGMENTED */
1855 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
1856 struct ieee80211_rate *rate)
1858 struct ieee80211_sub_if_data *sdata;
1859 struct ieee80211_local *local = rx->local;
1860 struct ieee80211_rtap_hdr {
1861 struct ieee80211_radiotap_header hdr;
1866 } __attribute__ ((packed)) *rthdr;
1867 struct sk_buff *skb = rx->skb, *skb2;
1868 struct net_device *prev_dev = NULL;
1869 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1871 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1874 if (skb_headroom(skb) < sizeof(*rthdr) &&
1875 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1878 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1879 memset(rthdr, 0, sizeof(*rthdr));
1880 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1881 rthdr->hdr.it_present =
1882 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1883 (1 << IEEE80211_RADIOTAP_CHANNEL));
1886 rthdr->rate_or_pad = rate->bitrate / 5;
1887 rthdr->hdr.it_present |=
1888 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
1890 rthdr->chan_freq = cpu_to_le16(status->freq);
1892 if (status->band == IEEE80211_BAND_5GHZ)
1893 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1894 IEEE80211_CHAN_5GHZ);
1896 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1897 IEEE80211_CHAN_2GHZ);
1899 skb_set_mac_header(skb, 0);
1900 skb->ip_summed = CHECKSUM_UNNECESSARY;
1901 skb->pkt_type = PACKET_OTHERHOST;
1902 skb->protocol = htons(ETH_P_802_2);
1904 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1905 if (!netif_running(sdata->dev))
1908 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1909 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1913 skb2 = skb_clone(skb, GFP_ATOMIC);
1915 skb2->dev = prev_dev;
1920 prev_dev = sdata->dev;
1921 sdata->dev->stats.rx_packets++;
1922 sdata->dev->stats.rx_bytes += skb->len;
1926 skb->dev = prev_dev;
1932 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1940 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1941 struct ieee80211_rx_data *rx,
1942 struct sk_buff *skb,
1943 struct ieee80211_rate *rate)
1945 ieee80211_rx_result res = RX_DROP_MONITOR;
1950 #define CALL_RXH(rxh) \
1953 if (res != RX_CONTINUE) \
1957 CALL_RXH(ieee80211_rx_h_passive_scan)
1958 CALL_RXH(ieee80211_rx_h_check)
1959 CALL_RXH(ieee80211_rx_h_decrypt)
1960 CALL_RXH(ieee80211_rx_h_check_more_data)
1961 CALL_RXH(ieee80211_rx_h_sta_process)
1962 CALL_RXH(ieee80211_rx_h_defragment)
1963 CALL_RXH(ieee80211_rx_h_ps_poll)
1964 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1965 /* must be after MMIC verify so header is counted in MPDU mic */
1966 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1967 CALL_RXH(ieee80211_rx_h_amsdu)
1968 #ifdef CONFIG_MAC80211_MESH
1969 if (ieee80211_vif_is_mesh(&sdata->vif))
1970 CALL_RXH(ieee80211_rx_h_mesh_fwding);
1972 CALL_RXH(ieee80211_rx_h_data)
1973 CALL_RXH(ieee80211_rx_h_ctrl)
1974 CALL_RXH(ieee80211_rx_h_action)
1975 CALL_RXH(ieee80211_rx_h_mgmt)
1981 case RX_DROP_MONITOR:
1982 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1984 rx->sta->rx_dropped++;
1987 ieee80211_rx_cooked_monitor(rx, rate);
1989 case RX_DROP_UNUSABLE:
1990 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1992 rx->sta->rx_dropped++;
1993 dev_kfree_skb(rx->skb);
1996 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2001 /* main receive path */
2003 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2004 struct ieee80211_rx_data *rx,
2005 struct ieee80211_hdr *hdr)
2007 struct sk_buff *skb = rx->skb;
2008 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2009 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2010 int multicast = is_multicast_ether_addr(hdr->addr1);
2012 switch (sdata->vif.type) {
2013 case NL80211_IFTYPE_STATION:
2014 if (!bssid && !sdata->u.mgd.use_4addr)
2017 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
2018 if (!(sdata->dev->flags & IFF_PROMISC))
2020 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2023 case NL80211_IFTYPE_ADHOC:
2026 if (ieee80211_is_beacon(hdr->frame_control)) {
2029 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2030 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2032 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2033 } else if (!multicast &&
2034 compare_ether_addr(sdata->dev->dev_addr,
2036 if (!(sdata->dev->flags & IFF_PROMISC))
2038 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2039 } else if (!rx->sta) {
2041 if (status->flag & RX_FLAG_HT)
2042 rate_idx = 0; /* TODO: HT rates */
2044 rate_idx = status->rate_idx;
2045 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2049 case NL80211_IFTYPE_MESH_POINT:
2051 compare_ether_addr(sdata->dev->dev_addr,
2053 if (!(sdata->dev->flags & IFF_PROMISC))
2056 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2059 case NL80211_IFTYPE_AP_VLAN:
2060 case NL80211_IFTYPE_AP:
2062 if (compare_ether_addr(sdata->dev->dev_addr,
2065 } else if (!ieee80211_bssid_match(bssid,
2066 sdata->dev->dev_addr)) {
2067 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2069 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2072 case NL80211_IFTYPE_WDS:
2073 if (bssid || !ieee80211_is_data(hdr->frame_control))
2075 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2078 case NL80211_IFTYPE_MONITOR:
2079 case NL80211_IFTYPE_UNSPECIFIED:
2080 case __NL80211_IFTYPE_AFTER_LAST:
2081 /* should never get here */
2090 * This is the actual Rx frames handler. as it blongs to Rx path it must
2091 * be called with rcu_read_lock protection.
2093 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2094 struct sk_buff *skb,
2095 struct ieee80211_rate *rate)
2097 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2098 struct ieee80211_local *local = hw_to_local(hw);
2099 struct ieee80211_sub_if_data *sdata;
2100 struct ieee80211_hdr *hdr;
2101 struct ieee80211_rx_data rx;
2103 struct ieee80211_sub_if_data *prev = NULL;
2104 struct sk_buff *skb_new;
2106 hdr = (struct ieee80211_hdr *)skb->data;
2107 memset(&rx, 0, sizeof(rx));
2111 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2112 local->dot11ReceivedFragmentCount++;
2114 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2115 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2116 rx.flags |= IEEE80211_RX_IN_SCAN;
2118 ieee80211_parse_qos(&rx);
2119 ieee80211_verify_alignment(&rx);
2121 rx.sta = sta_info_get(local, hdr->addr2);
2123 rx.sdata = rx.sta->sdata;
2125 if (rx.sdata && ieee80211_is_data(hdr->frame_control)) {
2126 rx.flags |= IEEE80211_RX_RA_MATCH;
2127 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2129 if (status->flag & RX_FLAG_MMIC_ERROR) {
2130 if (rx.flags & IEEE80211_RX_RA_MATCH)
2131 ieee80211_rx_michael_mic_report(hdr, &rx);
2135 } else list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2136 if (!netif_running(sdata->dev))
2139 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2140 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2143 rx.flags |= IEEE80211_RX_RA_MATCH;
2144 prepares = prepare_for_handlers(sdata, &rx, hdr);
2149 if (status->flag & RX_FLAG_MMIC_ERROR) {
2151 if (rx.flags & IEEE80211_RX_RA_MATCH)
2152 ieee80211_rx_michael_mic_report(hdr, &rx);
2157 * frame is destined for this interface, but if it's not
2158 * also for the previous one we handle that after the
2159 * loop to avoid copying the SKB once too much
2168 * frame was destined for the previous interface
2169 * so invoke RX handlers for it
2172 skb_new = skb_copy(skb, GFP_ATOMIC);
2174 if (net_ratelimit())
2175 printk(KERN_DEBUG "%s: failed to copy "
2176 "multicast frame for %s\n",
2177 wiphy_name(local->hw.wiphy),
2181 ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate);
2185 ieee80211_invoke_rx_handlers(prev, &rx, skb, rate);
2190 #define SEQ_MODULO 0x1000
2191 #define SEQ_MASK 0xfff
2193 static inline int seq_less(u16 sq1, u16 sq2)
2195 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2198 static inline u16 seq_inc(u16 sq)
2200 return (sq + 1) & SEQ_MASK;
2203 static inline u16 seq_sub(u16 sq1, u16 sq2)
2205 return (sq1 - sq2) & SEQ_MASK;
2209 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2210 struct tid_ampdu_rx *tid_agg_rx,
2213 struct ieee80211_supported_band *sband;
2214 struct ieee80211_rate *rate = NULL;
2215 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2216 struct ieee80211_rx_status *status;
2221 status = IEEE80211_SKB_RXCB(skb);
2223 /* release the reordered frames to stack */
2224 sband = hw->wiphy->bands[status->band];
2225 if (!(status->flag & RX_FLAG_HT))
2226 rate = &sband->bitrates[status->rate_idx];
2227 __ieee80211_rx_handle_packet(hw, skb, rate);
2228 tid_agg_rx->stored_mpdu_num--;
2229 tid_agg_rx->reorder_buf[index] = NULL;
2232 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2235 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
2236 struct tid_ampdu_rx *tid_agg_rx,
2241 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2242 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
2243 tid_agg_rx->buf_size;
2244 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
2249 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2250 * the skb was added to the buffer longer than this time ago, the earlier
2251 * frames that have not yet been received are assumed to be lost and the skb
2252 * can be released for processing. This may also release other skb's from the
2253 * reorder buffer if there are no additional gaps between the frames.
2255 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2258 * As this function belongs to the RX path it must be under
2259 * rcu_read_lock protection. It returns false if the frame
2260 * can be processed immediately, true if it was consumed.
2262 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2263 struct tid_ampdu_rx *tid_agg_rx,
2264 struct sk_buff *skb)
2266 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2267 u16 sc = le16_to_cpu(hdr->seq_ctrl);
2268 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2269 u16 head_seq_num, buf_size;
2272 buf_size = tid_agg_rx->buf_size;
2273 head_seq_num = tid_agg_rx->head_seq_num;
2275 /* frame with out of date sequence number */
2276 if (seq_less(mpdu_seq_num, head_seq_num)) {
2282 * If frame the sequence number exceeds our buffering window
2283 * size release some previous frames to make room for this one.
2285 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
2286 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
2287 /* release stored frames up to new head to stack */
2288 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
2291 /* Now the new frame is always in the range of the reordering buffer */
2293 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2295 /* check if we already stored this frame */
2296 if (tid_agg_rx->reorder_buf[index]) {
2302 * If the current MPDU is in the right order and nothing else
2303 * is stored we can process it directly, no need to buffer it.
2305 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2306 tid_agg_rx->stored_mpdu_num == 0) {
2307 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2311 /* put the frame in the reordering buffer */
2312 tid_agg_rx->reorder_buf[index] = skb;
2313 tid_agg_rx->reorder_time[index] = jiffies;
2314 tid_agg_rx->stored_mpdu_num++;
2315 /* release the buffer until next missing frame */
2316 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
2317 tid_agg_rx->buf_size;
2318 if (!tid_agg_rx->reorder_buf[index] &&
2319 tid_agg_rx->stored_mpdu_num > 1) {
2321 * No buffers ready to be released, but check whether any
2322 * frames in the reorder buffer have timed out.
2326 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2327 j = (j + 1) % tid_agg_rx->buf_size) {
2328 if (!tid_agg_rx->reorder_buf[j]) {
2332 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2333 HT_RX_REORDER_BUF_TIMEOUT))
2336 #ifdef CONFIG_MAC80211_HT_DEBUG
2337 if (net_ratelimit())
2338 printk(KERN_DEBUG "%s: release an RX reorder "
2339 "frame due to timeout on earlier "
2341 wiphy_name(hw->wiphy));
2343 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2346 * Increment the head seq# also for the skipped slots.
2348 tid_agg_rx->head_seq_num =
2349 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
2352 } else while (tid_agg_rx->reorder_buf[index]) {
2353 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
2354 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
2355 tid_agg_rx->buf_size;
2362 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
2363 * true if the MPDU was buffered, false if it should be processed.
2365 static bool ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2366 struct sk_buff *skb)
2368 struct ieee80211_hw *hw = &local->hw;
2369 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2370 struct sta_info *sta;
2371 struct tid_ampdu_rx *tid_agg_rx;
2375 if (!ieee80211_is_data_qos(hdr->frame_control))
2379 * filter the QoS data rx stream according to
2380 * STA/TID and check if this STA/TID is on aggregation
2383 sta = sta_info_get(local, hdr->addr2);
2387 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2389 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2392 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2394 /* qos null data frames are excluded */
2395 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2398 /* new, potentially un-ordered, ampdu frame - process it */
2400 /* reset session timer */
2401 if (tid_agg_rx->timeout)
2402 mod_timer(&tid_agg_rx->session_timer,
2403 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2405 /* if this mpdu is fragmented - terminate rx aggregation session */
2406 sc = le16_to_cpu(hdr->seq_ctrl);
2407 if (sc & IEEE80211_SCTL_FRAG) {
2408 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2409 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2414 return ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb);
2418 * This is the receive path handler. It is called by a low level driver when an
2419 * 802.11 MPDU is received from the hardware.
2421 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2423 struct ieee80211_local *local = hw_to_local(hw);
2424 struct ieee80211_rate *rate = NULL;
2425 struct ieee80211_supported_band *sband;
2426 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2428 WARN_ON_ONCE(softirq_count() == 0);
2430 if (WARN_ON(status->band < 0 ||
2431 status->band >= IEEE80211_NUM_BANDS))
2434 sband = local->hw.wiphy->bands[status->band];
2435 if (WARN_ON(!sband))
2439 * If we're suspending, it is possible although not too likely
2440 * that we'd be receiving frames after having already partially
2441 * quiesced the stack. We can't process such frames then since
2442 * that might, for example, cause stations to be added or other
2443 * driver callbacks be invoked.
2445 if (unlikely(local->quiescing || local->suspended))
2449 * The same happens when we're not even started,
2450 * but that's worth a warning.
2452 if (WARN_ON(!local->started))
2455 if (status->flag & RX_FLAG_HT) {
2457 * rate_idx is MCS index, which can be [0-76] as documented on:
2459 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2461 * Anything else would be some sort of driver or hardware error.
2462 * The driver should catch hardware errors.
2464 if (WARN((status->rate_idx < 0 ||
2465 status->rate_idx > 76),
2466 "Rate marked as an HT rate but passed "
2467 "status->rate_idx is not "
2468 "an MCS index [0-76]: %d (0x%02x)\n",
2473 if (WARN_ON(status->rate_idx < 0 ||
2474 status->rate_idx >= sband->n_bitrates))
2476 rate = &sband->bitrates[status->rate_idx];
2480 * key references and virtual interfaces are protected using RCU
2481 * and this requires that we are in a read-side RCU section during
2482 * receive processing
2487 * Frames with failed FCS/PLCP checksum are not returned,
2488 * all other frames are returned without radiotap header
2489 * if it was previously present.
2490 * Also, frames with less than 16 bytes are dropped.
2492 skb = ieee80211_rx_monitor(local, skb, rate);
2499 * In theory, the block ack reordering should happen after duplicate
2500 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2501 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2502 * happen as a new RX handler between ieee80211_rx_h_check and
2503 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2504 * the time being, the call can be here since RX reorder buf processing
2505 * will implicitly skip duplicates. We could, in theory at least,
2506 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2507 * frames from other than operational channel), but that should not
2508 * happen in normal networks.
2510 if (!ieee80211_rx_reorder_ampdu(local, skb))
2511 __ieee80211_rx_handle_packet(hw, skb, rate);
2519 EXPORT_SYMBOL(ieee80211_rx);
2521 /* This is a version of the rx handler that can be called from hard irq
2522 * context. Post the skb on the queue and schedule the tasklet */
2523 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2525 struct ieee80211_local *local = hw_to_local(hw);
2527 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2529 skb->pkt_type = IEEE80211_RX_MSG;
2530 skb_queue_tail(&local->skb_queue, skb);
2531 tasklet_schedule(&local->tasklet);
2533 EXPORT_SYMBOL(ieee80211_rx_irqsafe);