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 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
31 struct tid_ampdu_rx *tid_agg_rx,
36 * monitor mode reception
38 * This function cleans up the SKB, i.e. it removes all the stuff
39 * only useful for monitoring.
41 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
45 skb_pull(skb, rtap_len);
47 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
48 if (likely(skb->len > FCS_LEN))
49 skb_trim(skb, skb->len - FCS_LEN);
61 static inline int should_drop_frame(struct sk_buff *skb,
65 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
66 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
68 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
70 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
72 if (ieee80211_is_ctl(hdr->frame_control) &&
73 !ieee80211_is_pspoll(hdr->frame_control) &&
74 !ieee80211_is_back_req(hdr->frame_control))
80 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
81 struct ieee80211_rx_status *status)
85 /* always present fields */
86 len = sizeof(struct ieee80211_radiotap_header) + 9;
88 if (status->flag & RX_FLAG_TSFT)
90 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
92 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
95 if (len & 1) /* padding for RX_FLAGS if necessary */
102 * ieee80211_add_rx_radiotap_header - add radiotap header
104 * add a radiotap header containing all the fields which the hardware provided.
107 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
109 struct ieee80211_rate *rate,
112 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
113 struct ieee80211_radiotap_header *rthdr;
117 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
118 memset(rthdr, 0, rtap_len);
120 /* radiotap header, set always present flags */
122 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
123 (1 << IEEE80211_RADIOTAP_CHANNEL) |
124 (1 << IEEE80211_RADIOTAP_ANTENNA) |
125 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
126 rthdr->it_len = cpu_to_le16(rtap_len);
128 pos = (unsigned char *)(rthdr+1);
130 /* the order of the following fields is important */
132 /* IEEE80211_RADIOTAP_TSFT */
133 if (status->flag & RX_FLAG_TSFT) {
134 put_unaligned_le64(status->mactime, pos);
136 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
140 /* IEEE80211_RADIOTAP_FLAGS */
141 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
142 *pos |= IEEE80211_RADIOTAP_F_FCS;
143 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
144 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
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 put_unaligned_le16(status->freq, pos);
168 if (status->band == IEEE80211_BAND_5GHZ)
169 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
171 else if (rate->flags & IEEE80211_RATE_ERP_G)
172 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
175 put_unaligned_le16(IEEE80211_CHAN_CCK | 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 - (u8 *)rthdr) & 1)
207 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
208 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
209 put_unaligned_le16(rx_flags, pos);
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_rate *rate)
222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
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(origskb, present_fcs_len, rtap_len)) {
249 dev_kfree_skb(origskb);
253 return remove_monitor_info(local, origskb, rtap_len);
256 if (should_drop_frame(origskb, present_fcs_len, rtap_len)) {
257 /* only need to expand headroom if necessary */
262 * This shouldn't trigger often because most devices have an
263 * RX header they pull before we get here, and that should
264 * be big enough for our radiotap information. We should
265 * probably export the length to drivers so that we can have
266 * them allocate enough headroom to start with.
268 if (skb_headroom(skb) < needed_headroom &&
269 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
275 * Need to make a copy and possibly remove radiotap header
276 * and FCS from the original.
278 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
280 origskb = remove_monitor_info(local, origskb, rtap_len);
286 /* if necessary, prepend radiotap information */
287 if (!(status->flag & RX_FLAG_RADIOTAP))
288 ieee80211_add_rx_radiotap_header(local, skb, rate,
291 skb_reset_mac_header(skb);
292 skb->ip_summed = CHECKSUM_UNNECESSARY;
293 skb->pkt_type = PACKET_OTHERHOST;
294 skb->protocol = htons(ETH_P_802_2);
296 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
297 if (!netif_running(sdata->dev))
300 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
303 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
307 skb2 = skb_clone(skb, GFP_ATOMIC);
309 skb2->dev = prev_dev;
314 prev_dev = sdata->dev;
315 sdata->dev->stats.rx_packets++;
316 sdata->dev->stats.rx_bytes += skb->len;
329 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
331 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
334 /* does the frame have a qos control field? */
335 if (ieee80211_is_data_qos(hdr->frame_control)) {
336 u8 *qc = ieee80211_get_qos_ctl(hdr);
337 /* frame has qos control */
338 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
339 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
340 rx->flags |= IEEE80211_RX_AMSDU;
342 rx->flags &= ~IEEE80211_RX_AMSDU;
345 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
347 * Sequence numbers for management frames, QoS data
348 * frames with a broadcast/multicast address in the
349 * Address 1 field, and all non-QoS data frames sent
350 * by QoS STAs are assigned using an additional single
351 * modulo-4096 counter, [...]
353 * We also use that counter for non-QoS STAs.
355 tid = NUM_RX_DATA_QUEUES - 1;
359 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
360 * For now, set skb->priority to 0 for other cases. */
361 rx->skb->priority = (tid > 7) ? 0 : tid;
365 * DOC: Packet alignment
367 * Drivers always need to pass packets that are aligned to two-byte boundaries
370 * Additionally, should, if possible, align the payload data in a way that
371 * guarantees that the contained IP header is aligned to a four-byte
372 * boundary. In the case of regular frames, this simply means aligning the
373 * payload to a four-byte boundary (because either the IP header is directly
374 * contained, or IV/RFC1042 headers that have a length divisible by four are
377 * With A-MSDU frames, however, the payload data address must yield two modulo
378 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
379 * push the IP header further back to a multiple of four again. Thankfully, the
380 * specs were sane enough this time around to require padding each A-MSDU
381 * subframe to a length that is a multiple of four.
383 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
384 * the payload is not supported, the driver is required to move the 802.11
385 * header to be directly in front of the payload in that case.
387 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
389 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
392 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
396 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
397 "unaligned packet at 0x%p\n", rx->skb->data))
400 if (!ieee80211_is_data_present(hdr->frame_control))
403 hdrlen = ieee80211_hdrlen(hdr->frame_control);
404 if (rx->flags & IEEE80211_RX_AMSDU)
406 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
407 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
413 static ieee80211_rx_result debug_noinline
414 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
416 struct ieee80211_local *local = rx->local;
417 struct sk_buff *skb = rx->skb;
419 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
420 return ieee80211_scan_rx(rx->sdata, skb);
422 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
423 (rx->flags & IEEE80211_RX_IN_SCAN))) {
424 /* drop all the other packets during a software scan anyway */
425 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
430 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
431 /* scanning finished during invoking of handlers */
432 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
433 return RX_DROP_UNUSABLE;
440 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
442 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
447 return ieee80211_is_robust_mgmt_frame(hdr);
451 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
453 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
455 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
458 return ieee80211_is_robust_mgmt_frame(hdr);
462 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
463 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
465 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
466 struct ieee80211_mmie *mmie;
468 if (skb->len < 24 + sizeof(*mmie) ||
469 !is_multicast_ether_addr(hdr->da))
472 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
473 return -1; /* not a robust management frame */
475 mmie = (struct ieee80211_mmie *)
476 (skb->data + skb->len - sizeof(*mmie));
477 if (mmie->element_id != WLAN_EID_MMIE ||
478 mmie->length != sizeof(*mmie) - 2)
481 return le16_to_cpu(mmie->key_id);
485 static ieee80211_rx_result
486 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
488 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
489 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
490 char *dev_addr = rx->dev->dev_addr;
492 if (ieee80211_is_data(hdr->frame_control)) {
493 if (is_multicast_ether_addr(hdr->addr1)) {
494 if (ieee80211_has_tods(hdr->frame_control) ||
495 !ieee80211_has_fromds(hdr->frame_control))
496 return RX_DROP_MONITOR;
497 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
498 return RX_DROP_MONITOR;
500 if (!ieee80211_has_a4(hdr->frame_control))
501 return RX_DROP_MONITOR;
502 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
503 return RX_DROP_MONITOR;
507 /* If there is not an established peer link and this is not a peer link
508 * establisment frame, beacon or probe, drop the frame.
511 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
512 struct ieee80211_mgmt *mgmt;
514 if (!ieee80211_is_mgmt(hdr->frame_control))
515 return RX_DROP_MONITOR;
517 if (ieee80211_is_action(hdr->frame_control)) {
518 mgmt = (struct ieee80211_mgmt *)hdr;
519 if (mgmt->u.action.category != PLINK_CATEGORY)
520 return RX_DROP_MONITOR;
524 if (ieee80211_is_probe_req(hdr->frame_control) ||
525 ieee80211_is_probe_resp(hdr->frame_control) ||
526 ieee80211_is_beacon(hdr->frame_control))
529 return RX_DROP_MONITOR;
533 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
535 if (ieee80211_is_data(hdr->frame_control) &&
536 is_multicast_ether_addr(hdr->addr1) &&
537 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
538 return RX_DROP_MONITOR;
545 static ieee80211_rx_result debug_noinline
546 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
548 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
550 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
551 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
552 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
553 rx->sta->last_seq_ctrl[rx->queue] ==
555 if (rx->flags & IEEE80211_RX_RA_MATCH) {
556 rx->local->dot11FrameDuplicateCount++;
557 rx->sta->num_duplicates++;
559 return RX_DROP_MONITOR;
561 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
564 if (unlikely(rx->skb->len < 16)) {
565 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
566 return RX_DROP_MONITOR;
569 /* Drop disallowed frame classes based on STA auth/assoc state;
570 * IEEE 802.11, Chap 5.5.
572 * mac80211 filters only based on association state, i.e. it drops
573 * Class 3 frames from not associated stations. hostapd sends
574 * deauth/disassoc frames when needed. In addition, hostapd is
575 * responsible for filtering on both auth and assoc states.
578 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
579 return ieee80211_rx_mesh_check(rx);
581 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
582 ieee80211_is_pspoll(hdr->frame_control)) &&
583 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
584 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
585 if ((!ieee80211_has_fromds(hdr->frame_control) &&
586 !ieee80211_has_tods(hdr->frame_control) &&
587 ieee80211_is_data(hdr->frame_control)) ||
588 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
589 /* Drop IBSS frames and frames for other hosts
591 return RX_DROP_MONITOR;
594 return RX_DROP_MONITOR;
601 static ieee80211_rx_result debug_noinline
602 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
604 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
607 ieee80211_rx_result result = RX_DROP_UNUSABLE;
608 struct ieee80211_key *stakey = NULL;
609 int mmie_keyidx = -1;
614 * There are four types of keys:
616 * - IGTK (group keys for management frames)
617 * - PTK (pairwise keys)
618 * - STK (station-to-station pairwise keys)
620 * When selecting a key, we have to distinguish between multicast
621 * (including broadcast) and unicast frames, the latter can only
622 * use PTKs and STKs while the former always use GTKs and IGTKs.
623 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
624 * unicast frames can also use key indices like GTKs. Hence, if we
625 * don't have a PTK/STK we check the key index for a WEP key.
627 * Note that in a regular BSS, multicast frames are sent by the
628 * AP only, associated stations unicast the frame to the AP first
629 * which then multicasts it on their behalf.
631 * There is also a slight problem in IBSS mode: GTKs are negotiated
632 * with each station, that is something we don't currently handle.
633 * The spec seems to expect that one negotiates the same key with
634 * every station but there's no such requirement; VLANs could be
639 * No point in finding a key and decrypting if the frame is neither
640 * addressed to us nor a multicast frame.
642 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
646 stakey = rcu_dereference(rx->sta->key);
648 if (!ieee80211_has_protected(hdr->frame_control))
649 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
651 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
653 /* Skip decryption if the frame is not protected. */
654 if (!ieee80211_has_protected(hdr->frame_control))
656 } else if (mmie_keyidx >= 0) {
657 /* Broadcast/multicast robust management frame / BIP */
658 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
659 (rx->status->flag & RX_FLAG_IV_STRIPPED))
662 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
663 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
664 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
665 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
666 } else if (!ieee80211_has_protected(hdr->frame_control)) {
668 * The frame was not protected, so skip decryption. However, we
669 * need to set rx->key if there is a key that could have been
670 * used so that the frame may be dropped if encryption would
671 * have been expected.
673 struct ieee80211_key *key = NULL;
674 if (ieee80211_is_mgmt(hdr->frame_control) &&
675 is_multicast_ether_addr(hdr->addr1) &&
676 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
678 else if ((key = rcu_dereference(rx->sdata->default_key)))
683 * The device doesn't give us the IV so we won't be
684 * able to look up the key. That's ok though, we
685 * don't need to decrypt the frame, we just won't
686 * be able to keep statistics accurate.
687 * Except for key threshold notifications, should
688 * we somehow allow the driver to tell us which key
689 * the hardware used if this flag is set?
691 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
692 (rx->status->flag & RX_FLAG_IV_STRIPPED))
695 hdrlen = ieee80211_hdrlen(hdr->frame_control);
697 if (rx->skb->len < 8 + hdrlen)
698 return RX_DROP_UNUSABLE; /* TODO: count this? */
701 * no need to call ieee80211_wep_get_keyidx,
702 * it verifies a bunch of things we've done already
704 keyidx = rx->skb->data[hdrlen + 3] >> 6;
706 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
709 * RSNA-protected unicast frames should always be sent with
710 * pairwise or station-to-station keys, but for WEP we allow
711 * using a key index as well.
713 if (rx->key && rx->key->conf.alg != ALG_WEP &&
714 !is_multicast_ether_addr(hdr->addr1))
719 rx->key->tx_rx_count++;
720 /* TODO: add threshold stuff again */
722 return RX_DROP_MONITOR;
725 /* Check for weak IVs if possible */
726 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
727 ieee80211_is_data(hdr->frame_control) &&
728 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
729 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
730 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
731 rx->sta->wep_weak_iv_count++;
733 switch (rx->key->conf.alg) {
735 result = ieee80211_crypto_wep_decrypt(rx);
738 result = ieee80211_crypto_tkip_decrypt(rx);
741 result = ieee80211_crypto_ccmp_decrypt(rx);
744 result = ieee80211_crypto_aes_cmac_decrypt(rx);
748 /* either the frame has been decrypted or will be dropped */
749 rx->status->flag |= RX_FLAG_DECRYPTED;
754 static ieee80211_rx_result debug_noinline
755 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
757 struct ieee80211_local *local;
758 struct ieee80211_hdr *hdr;
763 hdr = (struct ieee80211_hdr *) skb->data;
765 if (!local->pspolling)
768 if (!ieee80211_has_fromds(hdr->frame_control))
769 /* this is not from AP */
772 if (!ieee80211_is_data(hdr->frame_control))
775 if (!ieee80211_has_moredata(hdr->frame_control)) {
776 /* AP has no more frames buffered for us */
777 local->pspolling = false;
781 /* more data bit is set, let's request a new frame from the AP */
782 ieee80211_send_pspoll(local, rx->sdata);
787 static void ap_sta_ps_start(struct sta_info *sta)
789 struct ieee80211_sub_if_data *sdata = sta->sdata;
790 struct ieee80211_local *local = sdata->local;
792 atomic_inc(&sdata->bss->num_sta_ps);
793 set_sta_flags(sta, WLAN_STA_PS);
794 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
795 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
796 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
797 sdata->dev->name, sta->sta.addr, sta->sta.aid);
798 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
801 static int ap_sta_ps_end(struct sta_info *sta)
803 struct ieee80211_sub_if_data *sdata = sta->sdata;
804 struct ieee80211_local *local = sdata->local;
807 atomic_dec(&sdata->bss->num_sta_ps);
809 clear_sta_flags(sta, WLAN_STA_PS);
810 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
812 if (!skb_queue_empty(&sta->ps_tx_buf))
813 sta_info_clear_tim_bit(sta);
815 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
816 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
817 sdata->dev->name, sta->sta.addr, sta->sta.aid);
818 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
820 /* Send all buffered frames to the station */
821 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
822 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
824 local->total_ps_buffered -= buffered;
826 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
827 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
828 "since STA not sleeping anymore\n", sdata->dev->name,
829 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
830 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
835 static ieee80211_rx_result debug_noinline
836 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
838 struct sta_info *sta = rx->sta;
839 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
845 * Update last_rx only for IBSS packets which are for the current
846 * BSSID to avoid keeping the current IBSS network alive in cases
847 * where other STAs start using different BSSID.
849 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
850 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
851 NL80211_IFTYPE_ADHOC);
852 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
853 sta->last_rx = jiffies;
854 } else if (!is_multicast_ether_addr(hdr->addr1)) {
856 * Mesh beacons will update last_rx when if they are found to
857 * match the current local configuration when processed.
859 sta->last_rx = jiffies;
862 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
865 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
866 ieee80211_sta_rx_notify(rx->sdata, hdr);
869 sta->rx_bytes += rx->skb->len;
870 sta->last_signal = rx->status->signal;
871 sta->last_qual = rx->status->qual;
872 sta->last_noise = rx->status->noise;
875 * Change STA power saving mode only at the end of a frame
878 if (!ieee80211_has_morefrags(hdr->frame_control) &&
879 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
880 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
881 if (test_sta_flags(sta, WLAN_STA_PS)) {
883 * Ignore doze->wake transitions that are
884 * indicated by non-data frames, the standard
885 * is unclear here, but for example going to
886 * PS mode and then scanning would cause a
887 * doze->wake transition for the probe request,
888 * and that is clearly undesirable.
890 if (ieee80211_is_data(hdr->frame_control) &&
891 !ieee80211_has_pm(hdr->frame_control))
892 rx->sent_ps_buffered += ap_sta_ps_end(sta);
894 if (ieee80211_has_pm(hdr->frame_control))
895 ap_sta_ps_start(sta);
899 /* Drop data::nullfunc frames silently, since they are used only to
900 * control station power saving mode. */
901 if (ieee80211_is_nullfunc(hdr->frame_control)) {
902 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
903 /* Update counter and free packet here to avoid counting this
904 * as a dropped packed. */
906 dev_kfree_skb(rx->skb);
911 } /* ieee80211_rx_h_sta_process */
913 static inline struct ieee80211_fragment_entry *
914 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
915 unsigned int frag, unsigned int seq, int rx_queue,
916 struct sk_buff **skb)
918 struct ieee80211_fragment_entry *entry;
921 idx = sdata->fragment_next;
922 entry = &sdata->fragments[sdata->fragment_next++];
923 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
924 sdata->fragment_next = 0;
926 if (!skb_queue_empty(&entry->skb_list)) {
927 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
928 struct ieee80211_hdr *hdr =
929 (struct ieee80211_hdr *) entry->skb_list.next->data;
930 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
931 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
932 "addr1=%pM addr2=%pM\n",
933 sdata->dev->name, idx,
934 jiffies - entry->first_frag_time, entry->seq,
935 entry->last_frag, hdr->addr1, hdr->addr2);
937 __skb_queue_purge(&entry->skb_list);
940 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
942 entry->first_frag_time = jiffies;
944 entry->rx_queue = rx_queue;
945 entry->last_frag = frag;
947 entry->extra_len = 0;
952 static inline struct ieee80211_fragment_entry *
953 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
954 unsigned int frag, unsigned int seq,
955 int rx_queue, struct ieee80211_hdr *hdr)
957 struct ieee80211_fragment_entry *entry;
960 idx = sdata->fragment_next;
961 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
962 struct ieee80211_hdr *f_hdr;
966 idx = IEEE80211_FRAGMENT_MAX - 1;
968 entry = &sdata->fragments[idx];
969 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
970 entry->rx_queue != rx_queue ||
971 entry->last_frag + 1 != frag)
974 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
977 * Check ftype and addresses are equal, else check next fragment
979 if (((hdr->frame_control ^ f_hdr->frame_control) &
980 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
981 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
982 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
985 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
986 __skb_queue_purge(&entry->skb_list);
995 static ieee80211_rx_result debug_noinline
996 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
998 struct ieee80211_hdr *hdr;
1001 unsigned int frag, seq;
1002 struct ieee80211_fragment_entry *entry;
1003 struct sk_buff *skb;
1005 hdr = (struct ieee80211_hdr *)rx->skb->data;
1006 fc = hdr->frame_control;
1007 sc = le16_to_cpu(hdr->seq_ctrl);
1008 frag = sc & IEEE80211_SCTL_FRAG;
1010 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1011 (rx->skb)->len < 24 ||
1012 is_multicast_ether_addr(hdr->addr1))) {
1013 /* not fragmented */
1016 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1018 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1021 /* This is the first fragment of a new frame. */
1022 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1023 rx->queue, &(rx->skb));
1024 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1025 ieee80211_has_protected(fc)) {
1026 /* Store CCMP PN so that we can verify that the next
1027 * fragment has a sequential PN value. */
1029 memcpy(entry->last_pn,
1030 rx->key->u.ccmp.rx_pn[rx->queue],
1036 /* This is a fragment for a frame that should already be pending in
1037 * fragment cache. Add this fragment to the end of the pending entry.
1039 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1041 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1042 return RX_DROP_MONITOR;
1045 /* Verify that MPDUs within one MSDU have sequential PN values.
1046 * (IEEE 802.11i, 8.3.3.4.5) */
1049 u8 pn[CCMP_PN_LEN], *rpn;
1050 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1051 return RX_DROP_UNUSABLE;
1052 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1053 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1058 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1059 if (memcmp(pn, rpn, CCMP_PN_LEN))
1060 return RX_DROP_UNUSABLE;
1061 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1064 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1065 __skb_queue_tail(&entry->skb_list, rx->skb);
1066 entry->last_frag = frag;
1067 entry->extra_len += rx->skb->len;
1068 if (ieee80211_has_morefrags(fc)) {
1073 rx->skb = __skb_dequeue(&entry->skb_list);
1074 if (skb_tailroom(rx->skb) < entry->extra_len) {
1075 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1076 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1078 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1079 __skb_queue_purge(&entry->skb_list);
1080 return RX_DROP_UNUSABLE;
1083 while ((skb = __skb_dequeue(&entry->skb_list))) {
1084 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1088 /* Complete frame has been reassembled - process it now */
1089 rx->flags |= IEEE80211_RX_FRAGMENTED;
1093 rx->sta->rx_packets++;
1094 if (is_multicast_ether_addr(hdr->addr1))
1095 rx->local->dot11MulticastReceivedFrameCount++;
1097 ieee80211_led_rx(rx->local);
1101 static ieee80211_rx_result debug_noinline
1102 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1104 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1105 struct sk_buff *skb;
1106 int no_pending_pkts;
1107 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1109 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1110 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1113 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1114 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1115 return RX_DROP_UNUSABLE;
1117 skb = skb_dequeue(&rx->sta->tx_filtered);
1119 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1121 rx->local->total_ps_buffered--;
1123 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1124 skb_queue_empty(&rx->sta->ps_tx_buf);
1127 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1128 struct ieee80211_hdr *hdr =
1129 (struct ieee80211_hdr *) skb->data;
1132 * Tell TX path to send this frame even though the STA may
1133 * still remain is PS mode after this frame exchange.
1135 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
1137 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1138 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1139 rx->sta->sta.addr, rx->sta->sta.aid,
1140 skb_queue_len(&rx->sta->ps_tx_buf));
1141 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1143 /* Use MoreData flag to indicate whether there are more
1144 * buffered frames for this STA */
1145 if (no_pending_pkts)
1146 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1148 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1150 ieee80211_add_pending_skb(rx->local, skb);
1152 if (no_pending_pkts)
1153 sta_info_clear_tim_bit(rx->sta);
1154 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1155 } else if (!rx->sent_ps_buffered) {
1157 * FIXME: This can be the result of a race condition between
1158 * us expiring a frame and the station polling for it.
1159 * Should we send it a null-func frame indicating we
1160 * have nothing buffered for it?
1162 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1163 "though there are no buffered frames for it\n",
1164 rx->dev->name, rx->sta->sta.addr);
1165 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1168 /* Free PS Poll skb here instead of returning RX_DROP that would
1169 * count as an dropped frame. */
1170 dev_kfree_skb(rx->skb);
1175 static ieee80211_rx_result debug_noinline
1176 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1178 u8 *data = rx->skb->data;
1179 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1181 if (!ieee80211_is_data_qos(hdr->frame_control))
1184 /* remove the qos control field, update frame type and meta-data */
1185 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1186 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1187 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1188 /* change frame type to non QOS */
1189 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1195 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1197 if (unlikely(!rx->sta ||
1198 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1205 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1208 * Pass through unencrypted frames if the hardware has
1209 * decrypted them already.
1211 if (rx->status->flag & RX_FLAG_DECRYPTED)
1214 /* Drop unencrypted frames if key is set. */
1215 if (unlikely(!ieee80211_has_protected(fc) &&
1216 !ieee80211_is_nullfunc(fc) &&
1217 ieee80211_is_data(fc) &&
1218 (rx->key || rx->sdata->drop_unencrypted)))
1220 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1221 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1224 /* BIP does not use Protected field, so need to check MMIE */
1225 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1226 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1230 * When using MFP, Action frames are not allowed prior to
1231 * having configured keys.
1233 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1234 ieee80211_is_robust_mgmt_frame(
1235 (struct ieee80211_hdr *) rx->skb->data)))
1243 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1245 struct net_device *dev = rx->dev;
1246 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1248 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
1252 * requires that rx->skb is a frame with ethernet header
1254 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1256 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1257 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1258 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1261 * Allow EAPOL frames to us/the PAE group address regardless
1262 * of whether the frame was encrypted or not.
1264 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1265 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1266 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1269 if (ieee80211_802_1x_port_control(rx) ||
1270 ieee80211_drop_unencrypted(rx, fc))
1277 * requires that rx->skb is a frame with ethernet header
1280 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1282 struct net_device *dev = rx->dev;
1283 struct ieee80211_local *local = rx->local;
1284 struct sk_buff *skb, *xmit_skb;
1285 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1286 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1287 struct sta_info *dsta;
1292 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1293 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1294 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1295 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1296 if (is_multicast_ether_addr(ehdr->h_dest)) {
1298 * send multicast frames both to higher layers in
1299 * local net stack and back to the wireless medium
1301 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1302 if (!xmit_skb && net_ratelimit())
1303 printk(KERN_DEBUG "%s: failed to clone "
1304 "multicast frame\n", dev->name);
1306 dsta = sta_info_get(local, skb->data);
1307 if (dsta && dsta->sdata->dev == dev) {
1309 * The destination station is associated to
1310 * this AP (in this VLAN), so send the frame
1311 * directly to it and do not pass it to local
1321 int align __maybe_unused;
1323 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1325 * 'align' will only take the values 0 or 2 here
1326 * since all frames are required to be aligned
1327 * to 2-byte boundaries when being passed to
1328 * mac80211. That also explains the __skb_push()
1331 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1333 if (WARN_ON(skb_headroom(skb) < 3)) {
1337 u8 *data = skb->data;
1338 size_t len = skb->len;
1339 u8 *new = __skb_push(skb, align);
1340 memmove(new, data, len);
1341 __skb_trim(skb, len);
1347 /* deliver to local stack */
1348 skb->protocol = eth_type_trans(skb, dev);
1349 memset(skb->cb, 0, sizeof(skb->cb));
1355 /* send to wireless media */
1356 xmit_skb->protocol = htons(ETH_P_802_3);
1357 skb_reset_network_header(xmit_skb);
1358 skb_reset_mac_header(xmit_skb);
1359 dev_queue_xmit(xmit_skb);
1363 static ieee80211_rx_result debug_noinline
1364 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1366 struct net_device *dev = rx->dev;
1367 struct ieee80211_local *local = rx->local;
1370 struct sk_buff *skb = rx->skb, *frame = NULL;
1371 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1372 __le16 fc = hdr->frame_control;
1373 const struct ethhdr *eth;
1378 if (unlikely(!ieee80211_is_data(fc)))
1381 if (unlikely(!ieee80211_is_data_present(fc)))
1382 return RX_DROP_MONITOR;
1384 if (!(rx->flags & IEEE80211_RX_AMSDU))
1387 err = __ieee80211_data_to_8023(rx);
1389 return RX_DROP_UNUSABLE;
1393 dev->stats.rx_packets++;
1394 dev->stats.rx_bytes += skb->len;
1396 /* skip the wrapping header */
1397 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1399 return RX_DROP_UNUSABLE;
1401 while (skb != frame) {
1403 __be16 len = eth->h_proto;
1404 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1406 remaining = skb->len;
1407 memcpy(dst, eth->h_dest, ETH_ALEN);
1408 memcpy(src, eth->h_source, ETH_ALEN);
1410 padding = ((4 - subframe_len) & 0x3);
1411 /* the last MSDU has no padding */
1412 if (subframe_len > remaining)
1413 return RX_DROP_UNUSABLE;
1415 skb_pull(skb, sizeof(struct ethhdr));
1416 /* if last subframe reuse skb */
1417 if (remaining <= subframe_len + padding)
1421 * Allocate and reserve two bytes more for payload
1422 * alignment since sizeof(struct ethhdr) is 14.
1424 frame = dev_alloc_skb(
1425 ALIGN(local->hw.extra_tx_headroom, 4) +
1429 return RX_DROP_UNUSABLE;
1432 ALIGN(local->hw.extra_tx_headroom, 4) +
1433 sizeof(struct ethhdr) + 2);
1434 memcpy(skb_put(frame, ntohs(len)), skb->data,
1437 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1440 dev_kfree_skb(frame);
1441 return RX_DROP_UNUSABLE;
1445 skb_reset_network_header(frame);
1447 frame->priority = skb->priority;
1450 payload = frame->data;
1451 ethertype = (payload[6] << 8) | payload[7];
1453 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1454 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1455 compare_ether_addr(payload,
1456 bridge_tunnel_header) == 0)) {
1457 /* remove RFC1042 or Bridge-Tunnel
1458 * encapsulation and replace EtherType */
1460 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1461 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1463 memcpy(skb_push(frame, sizeof(__be16)),
1464 &len, sizeof(__be16));
1465 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1466 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1469 if (!ieee80211_frame_allowed(rx, fc)) {
1470 if (skb == frame) /* last frame */
1471 return RX_DROP_UNUSABLE;
1472 dev_kfree_skb(frame);
1476 ieee80211_deliver_skb(rx);
1482 #ifdef CONFIG_MAC80211_MESH
1483 static ieee80211_rx_result
1484 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1486 struct ieee80211_hdr *hdr;
1487 struct ieee80211s_hdr *mesh_hdr;
1488 unsigned int hdrlen;
1489 struct sk_buff *skb = rx->skb, *fwd_skb;
1490 struct ieee80211_local *local = rx->local;
1491 struct ieee80211_sub_if_data *sdata;
1493 hdr = (struct ieee80211_hdr *) skb->data;
1494 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1495 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1496 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1498 if (!ieee80211_is_data(hdr->frame_control))
1503 return RX_DROP_MONITOR;
1505 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1506 struct mesh_path *mppath;
1510 if (is_multicast_ether_addr(hdr->addr1)) {
1511 mpp_addr = hdr->addr3;
1512 proxied_addr = mesh_hdr->eaddr1;
1514 mpp_addr = hdr->addr4;
1515 proxied_addr = mesh_hdr->eaddr2;
1519 mppath = mpp_path_lookup(proxied_addr, sdata);
1521 mpp_path_add(proxied_addr, mpp_addr, sdata);
1523 spin_lock_bh(&mppath->state_lock);
1524 mppath->exp_time = jiffies;
1525 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1526 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1527 spin_unlock_bh(&mppath->state_lock);
1532 /* Frame has reached destination. Don't forward */
1533 if (!is_multicast_ether_addr(hdr->addr1) &&
1534 compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1539 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1541 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1542 dropped_frames_ttl);
1544 struct ieee80211_hdr *fwd_hdr;
1545 struct ieee80211_tx_info *info;
1547 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1549 if (!fwd_skb && net_ratelimit())
1550 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1553 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1554 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1555 info = IEEE80211_SKB_CB(fwd_skb);
1556 memset(info, 0, sizeof(*info));
1557 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1558 info->control.vif = &rx->sdata->vif;
1559 ieee80211_select_queue(local, fwd_skb);
1560 if (is_multicast_ether_addr(fwd_hdr->addr1))
1561 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1566 * Save TA to addr1 to send TA a path error if a
1567 * suitable next hop is not found
1569 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1571 err = mesh_nexthop_lookup(fwd_skb, sdata);
1572 /* Failed to immediately resolve next hop:
1573 * fwded frame was dropped or will be added
1574 * later to the pending skb queue. */
1576 return RX_DROP_MONITOR;
1578 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1581 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1583 ieee80211_add_pending_skb(local, fwd_skb);
1587 if (is_multicast_ether_addr(hdr->addr1) ||
1588 rx->dev->flags & IFF_PROMISC)
1591 return RX_DROP_MONITOR;
1595 static ieee80211_rx_result debug_noinline
1596 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1598 struct net_device *dev = rx->dev;
1599 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1600 __le16 fc = hdr->frame_control;
1603 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1606 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1607 return RX_DROP_MONITOR;
1609 err = __ieee80211_data_to_8023(rx);
1611 return RX_DROP_UNUSABLE;
1613 if (!ieee80211_frame_allowed(rx, fc))
1614 return RX_DROP_MONITOR;
1618 dev->stats.rx_packets++;
1619 dev->stats.rx_bytes += rx->skb->len;
1621 ieee80211_deliver_skb(rx);
1626 static ieee80211_rx_result debug_noinline
1627 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1629 struct ieee80211_local *local = rx->local;
1630 struct ieee80211_hw *hw = &local->hw;
1631 struct sk_buff *skb = rx->skb;
1632 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1633 struct tid_ampdu_rx *tid_agg_rx;
1637 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1640 if (ieee80211_is_back_req(bar->frame_control)) {
1643 tid = le16_to_cpu(bar->control) >> 12;
1644 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1645 != HT_AGG_STATE_OPERATIONAL)
1647 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1649 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1651 /* reset session timer */
1652 if (tid_agg_rx->timeout)
1653 mod_timer(&tid_agg_rx->session_timer,
1654 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1656 /* manage reordering buffer according to requested */
1657 /* sequence number */
1659 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1662 return RX_DROP_UNUSABLE;
1668 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1669 struct ieee80211_mgmt *mgmt,
1672 struct ieee80211_local *local = sdata->local;
1673 struct sk_buff *skb;
1674 struct ieee80211_mgmt *resp;
1676 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1677 /* Not to own unicast address */
1681 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1682 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1683 /* Not from the current AP or not associated yet. */
1687 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1688 /* Too short SA Query request frame */
1692 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1696 skb_reserve(skb, local->hw.extra_tx_headroom);
1697 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1698 memset(resp, 0, 24);
1699 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1700 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1701 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1702 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1703 IEEE80211_STYPE_ACTION);
1704 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1705 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1706 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1707 memcpy(resp->u.action.u.sa_query.trans_id,
1708 mgmt->u.action.u.sa_query.trans_id,
1709 WLAN_SA_QUERY_TR_ID_LEN);
1711 ieee80211_tx_skb(sdata, skb, 1);
1714 static ieee80211_rx_result debug_noinline
1715 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1717 struct ieee80211_local *local = rx->local;
1718 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1719 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1720 int len = rx->skb->len;
1722 if (!ieee80211_is_action(mgmt->frame_control))
1726 return RX_DROP_MONITOR;
1728 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1729 return RX_DROP_MONITOR;
1731 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1732 return RX_DROP_MONITOR;
1734 /* all categories we currently handle have action_code */
1735 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1736 return RX_DROP_MONITOR;
1738 switch (mgmt->u.action.category) {
1739 case WLAN_CATEGORY_BACK:
1741 * The aggregation code is not prepared to handle
1742 * anything but STA/AP due to the BSSID handling;
1743 * IBSS could work in the code but isn't supported
1744 * by drivers or the standard.
1746 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1747 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1748 sdata->vif.type != NL80211_IFTYPE_AP)
1749 return RX_DROP_MONITOR;
1751 switch (mgmt->u.action.u.addba_req.action_code) {
1752 case WLAN_ACTION_ADDBA_REQ:
1753 if (len < (IEEE80211_MIN_ACTION_SIZE +
1754 sizeof(mgmt->u.action.u.addba_req)))
1755 return RX_DROP_MONITOR;
1756 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1758 case WLAN_ACTION_ADDBA_RESP:
1759 if (len < (IEEE80211_MIN_ACTION_SIZE +
1760 sizeof(mgmt->u.action.u.addba_resp)))
1761 return RX_DROP_MONITOR;
1762 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1764 case WLAN_ACTION_DELBA:
1765 if (len < (IEEE80211_MIN_ACTION_SIZE +
1766 sizeof(mgmt->u.action.u.delba)))
1767 return RX_DROP_MONITOR;
1768 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1772 case WLAN_CATEGORY_SPECTRUM_MGMT:
1773 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1774 return RX_DROP_MONITOR;
1776 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1777 return RX_DROP_MONITOR;
1779 switch (mgmt->u.action.u.measurement.action_code) {
1780 case WLAN_ACTION_SPCT_MSR_REQ:
1781 if (len < (IEEE80211_MIN_ACTION_SIZE +
1782 sizeof(mgmt->u.action.u.measurement)))
1783 return RX_DROP_MONITOR;
1784 ieee80211_process_measurement_req(sdata, mgmt, len);
1786 case WLAN_ACTION_SPCT_CHL_SWITCH:
1787 if (len < (IEEE80211_MIN_ACTION_SIZE +
1788 sizeof(mgmt->u.action.u.chan_switch)))
1789 return RX_DROP_MONITOR;
1791 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1792 return RX_DROP_MONITOR;
1794 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1795 return RX_DROP_MONITOR;
1797 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1800 case WLAN_CATEGORY_SA_QUERY:
1801 if (len < (IEEE80211_MIN_ACTION_SIZE +
1802 sizeof(mgmt->u.action.u.sa_query)))
1803 return RX_DROP_MONITOR;
1804 switch (mgmt->u.action.u.sa_query.action) {
1805 case WLAN_ACTION_SA_QUERY_REQUEST:
1806 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1807 return RX_DROP_MONITOR;
1808 ieee80211_process_sa_query_req(sdata, mgmt, len);
1810 case WLAN_ACTION_SA_QUERY_RESPONSE:
1812 * SA Query response is currently only used in AP mode
1813 * and it is processed in user space.
1822 rx->sta->rx_packets++;
1823 dev_kfree_skb(rx->skb);
1827 static ieee80211_rx_result debug_noinline
1828 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1830 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1831 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1833 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1834 return RX_DROP_MONITOR;
1836 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1837 return RX_DROP_MONITOR;
1839 if (ieee80211_vif_is_mesh(&sdata->vif))
1840 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
1842 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
1843 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
1845 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1846 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1848 return RX_DROP_MONITOR;
1851 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
1852 struct ieee80211_rx_data *rx)
1855 unsigned int hdrlen;
1857 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1858 if (rx->skb->len >= hdrlen + 4)
1859 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1865 * Some hardware seem to generate incorrect Michael MIC
1866 * reports; ignore them to avoid triggering countermeasures.
1871 if (!ieee80211_has_protected(hdr->frame_control))
1874 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1876 * APs with pairwise keys should never receive Michael MIC
1877 * errors for non-zero keyidx because these are reserved for
1878 * group keys and only the AP is sending real multicast
1879 * frames in the BSS.
1884 if (!ieee80211_is_data(hdr->frame_control) &&
1885 !ieee80211_is_auth(hdr->frame_control))
1888 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1891 dev_kfree_skb(rx->skb);
1895 /* TODO: use IEEE80211_RX_FRAGMENTED */
1896 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1898 struct ieee80211_sub_if_data *sdata;
1899 struct ieee80211_local *local = rx->local;
1900 struct ieee80211_rtap_hdr {
1901 struct ieee80211_radiotap_header hdr;
1906 } __attribute__ ((packed)) *rthdr;
1907 struct sk_buff *skb = rx->skb, *skb2;
1908 struct net_device *prev_dev = NULL;
1909 struct ieee80211_rx_status *status = rx->status;
1911 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1914 if (skb_headroom(skb) < sizeof(*rthdr) &&
1915 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1918 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1919 memset(rthdr, 0, sizeof(*rthdr));
1920 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1921 rthdr->hdr.it_present =
1922 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1923 (1 << IEEE80211_RADIOTAP_RATE) |
1924 (1 << IEEE80211_RADIOTAP_CHANNEL));
1926 rthdr->rate = rx->rate->bitrate / 5;
1927 rthdr->chan_freq = cpu_to_le16(status->freq);
1929 if (status->band == IEEE80211_BAND_5GHZ)
1930 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1931 IEEE80211_CHAN_5GHZ);
1933 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1934 IEEE80211_CHAN_2GHZ);
1936 skb_set_mac_header(skb, 0);
1937 skb->ip_summed = CHECKSUM_UNNECESSARY;
1938 skb->pkt_type = PACKET_OTHERHOST;
1939 skb->protocol = htons(ETH_P_802_2);
1941 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1942 if (!netif_running(sdata->dev))
1945 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1946 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1950 skb2 = skb_clone(skb, GFP_ATOMIC);
1952 skb2->dev = prev_dev;
1957 prev_dev = sdata->dev;
1958 sdata->dev->stats.rx_packets++;
1959 sdata->dev->stats.rx_bytes += skb->len;
1963 skb->dev = prev_dev;
1969 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1977 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1978 struct ieee80211_rx_data *rx,
1979 struct sk_buff *skb)
1981 ieee80211_rx_result res = RX_DROP_MONITOR;
1985 rx->dev = sdata->dev;
1987 #define CALL_RXH(rxh) \
1990 if (res != RX_CONTINUE) \
1994 CALL_RXH(ieee80211_rx_h_passive_scan)
1995 CALL_RXH(ieee80211_rx_h_check)
1996 CALL_RXH(ieee80211_rx_h_decrypt)
1997 CALL_RXH(ieee80211_rx_h_check_more_data)
1998 CALL_RXH(ieee80211_rx_h_sta_process)
1999 CALL_RXH(ieee80211_rx_h_defragment)
2000 CALL_RXH(ieee80211_rx_h_ps_poll)
2001 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2002 /* must be after MMIC verify so header is counted in MPDU mic */
2003 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2004 CALL_RXH(ieee80211_rx_h_amsdu)
2005 #ifdef CONFIG_MAC80211_MESH
2006 if (ieee80211_vif_is_mesh(&sdata->vif))
2007 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2009 CALL_RXH(ieee80211_rx_h_data)
2010 CALL_RXH(ieee80211_rx_h_ctrl)
2011 CALL_RXH(ieee80211_rx_h_action)
2012 CALL_RXH(ieee80211_rx_h_mgmt)
2018 case RX_DROP_MONITOR:
2019 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2021 rx->sta->rx_dropped++;
2024 ieee80211_rx_cooked_monitor(rx);
2026 case RX_DROP_UNUSABLE:
2027 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2029 rx->sta->rx_dropped++;
2030 dev_kfree_skb(rx->skb);
2033 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2038 /* main receive path */
2040 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2041 struct ieee80211_rx_data *rx,
2042 struct ieee80211_hdr *hdr)
2044 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
2045 int multicast = is_multicast_ether_addr(hdr->addr1);
2047 switch (sdata->vif.type) {
2048 case NL80211_IFTYPE_STATION:
2052 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
2053 if (!(sdata->dev->flags & IFF_PROMISC))
2055 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2058 case NL80211_IFTYPE_ADHOC:
2061 if (ieee80211_is_beacon(hdr->frame_control)) {
2064 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2065 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2067 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2068 } else if (!multicast &&
2069 compare_ether_addr(sdata->dev->dev_addr,
2071 if (!(sdata->dev->flags & IFF_PROMISC))
2073 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2074 } else if (!rx->sta) {
2076 if (rx->status->flag & RX_FLAG_HT)
2077 rate_idx = 0; /* TODO: HT rates */
2079 rate_idx = rx->status->rate_idx;
2080 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2084 case NL80211_IFTYPE_MESH_POINT:
2086 compare_ether_addr(sdata->dev->dev_addr,
2088 if (!(sdata->dev->flags & IFF_PROMISC))
2091 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2094 case NL80211_IFTYPE_AP_VLAN:
2095 case NL80211_IFTYPE_AP:
2097 if (compare_ether_addr(sdata->dev->dev_addr,
2100 } else if (!ieee80211_bssid_match(bssid,
2101 sdata->dev->dev_addr)) {
2102 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2104 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2107 case NL80211_IFTYPE_WDS:
2108 if (bssid || !ieee80211_is_data(hdr->frame_control))
2110 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2113 case NL80211_IFTYPE_MONITOR:
2114 /* take everything */
2116 case NL80211_IFTYPE_UNSPECIFIED:
2117 case __NL80211_IFTYPE_AFTER_LAST:
2118 /* should never get here */
2127 * This is the actual Rx frames handler. as it blongs to Rx path it must
2128 * be called with rcu_read_lock protection.
2130 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2131 struct sk_buff *skb,
2132 struct ieee80211_rate *rate)
2134 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2135 struct ieee80211_local *local = hw_to_local(hw);
2136 struct ieee80211_sub_if_data *sdata;
2137 struct ieee80211_hdr *hdr;
2138 struct ieee80211_rx_data rx;
2140 struct ieee80211_sub_if_data *prev = NULL;
2141 struct sk_buff *skb_new;
2143 hdr = (struct ieee80211_hdr *)skb->data;
2144 memset(&rx, 0, sizeof(rx));
2151 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2152 local->dot11ReceivedFragmentCount++;
2154 rx.sta = sta_info_get(local, hdr->addr2);
2156 rx.sdata = rx.sta->sdata;
2157 rx.dev = rx.sta->sdata->dev;
2160 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
2161 ieee80211_rx_michael_mic_report(hdr, &rx);
2165 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2166 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2167 rx.flags |= IEEE80211_RX_IN_SCAN;
2169 ieee80211_parse_qos(&rx);
2170 ieee80211_verify_alignment(&rx);
2174 if (rx.sdata && ieee80211_is_data(hdr->frame_control)) {
2175 rx.flags |= IEEE80211_RX_RA_MATCH;
2176 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2179 } else list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2180 if (!netif_running(sdata->dev))
2183 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2184 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2187 rx.flags |= IEEE80211_RX_RA_MATCH;
2188 prepares = prepare_for_handlers(sdata, &rx, hdr);
2194 * frame is destined for this interface, but if it's not
2195 * also for the previous one we handle that after the
2196 * loop to avoid copying the SKB once too much
2205 * frame was destined for the previous interface
2206 * so invoke RX handlers for it
2209 skb_new = skb_copy(skb, GFP_ATOMIC);
2211 if (net_ratelimit())
2212 printk(KERN_DEBUG "%s: failed to copy "
2213 "multicast frame for %s\n",
2214 wiphy_name(local->hw.wiphy),
2218 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2222 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2227 #define SEQ_MODULO 0x1000
2228 #define SEQ_MASK 0xfff
2230 static inline int seq_less(u16 sq1, u16 sq2)
2232 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2235 static inline u16 seq_inc(u16 sq)
2237 return (sq + 1) & SEQ_MASK;
2240 static inline u16 seq_sub(u16 sq1, u16 sq2)
2242 return (sq1 - sq2) & SEQ_MASK;
2246 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2247 struct tid_ampdu_rx *tid_agg_rx,
2250 struct ieee80211_supported_band *sband;
2251 struct ieee80211_rate *rate;
2252 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2253 struct ieee80211_rx_status *status;
2258 status = IEEE80211_SKB_RXCB(skb);
2260 /* release the reordered frames to stack */
2261 sband = hw->wiphy->bands[status->band];
2262 if (status->flag & RX_FLAG_HT)
2263 rate = sband->bitrates; /* TODO: HT rates */
2265 rate = &sband->bitrates[status->rate_idx];
2266 __ieee80211_rx_handle_packet(hw, skb, rate);
2267 tid_agg_rx->stored_mpdu_num--;
2268 tid_agg_rx->reorder_buf[index] = NULL;
2271 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2276 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2277 * the skb was added to the buffer longer than this time ago, the earlier
2278 * frames that have not yet been received are assumed to be lost and the skb
2279 * can be released for processing. This may also release other skb's from the
2280 * reorder buffer if there are no additional gaps between the frames.
2282 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2285 * As it function blongs to Rx path it must be called with
2286 * the proper rcu_read_lock protection for its flow.
2288 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2289 struct tid_ampdu_rx *tid_agg_rx,
2290 struct sk_buff *skb,
2294 u16 head_seq_num, buf_size;
2297 buf_size = tid_agg_rx->buf_size;
2298 head_seq_num = tid_agg_rx->head_seq_num;
2300 /* frame with out of date sequence number */
2301 if (seq_less(mpdu_seq_num, head_seq_num)) {
2306 /* if frame sequence number exceeds our buffering window size or
2307 * block Ack Request arrived - release stored frames */
2308 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2309 /* new head to the ordering buffer */
2311 head_seq_num = mpdu_seq_num;
2314 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2315 /* release stored frames up to new head to stack */
2316 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2317 index = seq_sub(tid_agg_rx->head_seq_num,
2319 % tid_agg_rx->buf_size;
2320 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2327 /* now the new frame is always in the range of the reordering */
2329 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2330 % tid_agg_rx->buf_size;
2331 /* check if we already stored this frame */
2332 if (tid_agg_rx->reorder_buf[index]) {
2337 /* if arrived mpdu is in the right order and nothing else stored */
2338 /* release it immediately */
2339 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2340 tid_agg_rx->stored_mpdu_num == 0) {
2341 tid_agg_rx->head_seq_num =
2342 seq_inc(tid_agg_rx->head_seq_num);
2346 /* put the frame in the reordering buffer */
2347 tid_agg_rx->reorder_buf[index] = skb;
2348 tid_agg_rx->reorder_time[index] = jiffies;
2349 tid_agg_rx->stored_mpdu_num++;
2350 /* release the buffer until next missing frame */
2351 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2352 % tid_agg_rx->buf_size;
2353 if (!tid_agg_rx->reorder_buf[index] &&
2354 tid_agg_rx->stored_mpdu_num > 1) {
2356 * No buffers ready to be released, but check whether any
2357 * frames in the reorder buffer have timed out.
2361 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2362 j = (j + 1) % tid_agg_rx->buf_size) {
2363 if (tid_agg_rx->reorder_buf[j] == NULL) {
2367 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2371 #ifdef CONFIG_MAC80211_HT_DEBUG
2372 if (net_ratelimit())
2373 printk(KERN_DEBUG "%s: release an RX reorder "
2374 "frame due to timeout on earlier "
2376 wiphy_name(hw->wiphy));
2378 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2381 * Increment the head seq# also for the skipped slots.
2383 tid_agg_rx->head_seq_num =
2384 (tid_agg_rx->head_seq_num + skipped) &
2388 } else while (tid_agg_rx->reorder_buf[index]) {
2389 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
2390 index = seq_sub(tid_agg_rx->head_seq_num,
2391 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2396 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2397 struct sk_buff *skb)
2399 struct ieee80211_hw *hw = &local->hw;
2400 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2401 struct sta_info *sta;
2402 struct tid_ampdu_rx *tid_agg_rx;
2408 sta = sta_info_get(local, hdr->addr2);
2412 /* filter the QoS data rx stream according to
2413 * STA/TID and check if this STA/TID is on aggregation */
2414 if (!ieee80211_is_data_qos(hdr->frame_control))
2417 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2419 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2422 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2424 /* qos null data frames are excluded */
2425 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2428 /* new un-ordered ampdu frame - process it */
2430 /* reset session timer */
2431 if (tid_agg_rx->timeout)
2432 mod_timer(&tid_agg_rx->session_timer,
2433 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2435 /* if this mpdu is fragmented - terminate rx aggregation session */
2436 sc = le16_to_cpu(hdr->seq_ctrl);
2437 if (sc & IEEE80211_SCTL_FRAG) {
2438 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2439 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2444 /* according to mpdu sequence number deal with reordering buffer */
2445 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2446 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2453 * This is the receive path handler. It is called by a low level driver when an
2454 * 802.11 MPDU is received from the hardware.
2456 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2458 struct ieee80211_local *local = hw_to_local(hw);
2459 struct ieee80211_rate *rate = NULL;
2460 struct ieee80211_supported_band *sband;
2461 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2463 WARN_ON_ONCE(softirq_count() == 0);
2465 if (WARN_ON(status->band < 0 ||
2466 status->band >= IEEE80211_NUM_BANDS))
2469 sband = local->hw.wiphy->bands[status->band];
2470 if (WARN_ON(!sband))
2474 * If we're suspending, it is possible although not too likely
2475 * that we'd be receiving frames after having already partially
2476 * quiesced the stack. We can't process such frames then since
2477 * that might, for example, cause stations to be added or other
2478 * driver callbacks be invoked.
2480 if (unlikely(local->quiescing || local->suspended))
2484 * The same happens when we're not even started,
2485 * but that's worth a warning.
2487 if (WARN_ON(!local->started))
2490 if (status->flag & RX_FLAG_HT) {
2491 /* rate_idx is MCS index */
2492 if (WARN_ON(status->rate_idx < 0 ||
2493 status->rate_idx >= 76))
2495 /* HT rates are not in the table - use the highest legacy rate
2496 * for now since other parts of mac80211 may not yet be fully
2498 rate = &sband->bitrates[sband->n_bitrates - 1];
2500 if (WARN_ON(status->rate_idx < 0 ||
2501 status->rate_idx >= sband->n_bitrates))
2503 rate = &sband->bitrates[status->rate_idx];
2507 * key references and virtual interfaces are protected using RCU
2508 * and this requires that we are in a read-side RCU section during
2509 * receive processing
2514 * Frames with failed FCS/PLCP checksum are not returned,
2515 * all other frames are returned without radiotap header
2516 * if it was previously present.
2517 * Also, frames with less than 16 bytes are dropped.
2519 skb = ieee80211_rx_monitor(local, skb, rate);
2526 * In theory, the block ack reordering should happen after duplicate
2527 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2528 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2529 * happen as a new RX handler between ieee80211_rx_h_check and
2530 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2531 * the time being, the call can be here since RX reorder buf processing
2532 * will implicitly skip duplicates. We could, in theory at least,
2533 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2534 * frames from other than operational channel), but that should not
2535 * happen in normal networks.
2537 if (!ieee80211_rx_reorder_ampdu(local, skb))
2538 __ieee80211_rx_handle_packet(hw, skb, rate);
2546 EXPORT_SYMBOL(ieee80211_rx);
2548 /* This is a version of the rx handler that can be called from hard irq
2549 * context. Post the skb on the queue and schedule the tasklet */
2550 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2552 struct ieee80211_local *local = hw_to_local(hw);
2554 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2556 skb->pkt_type = IEEE80211_RX_MSG;
2557 skb_queue_tail(&local->skb_queue, skb);
2558 tasklet_schedule(&local->tasklet);
2560 EXPORT_SYMBOL(ieee80211_rx_irqsafe);