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,
44 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
45 if (likely(skb->len > FCS_LEN))
46 skb_trim(skb, skb->len - FCS_LEN);
58 static inline int should_drop_frame(struct sk_buff *skb,
61 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
62 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
64 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
66 if (unlikely(skb->len < 16 + present_fcs_len))
68 if (ieee80211_is_ctl(hdr->frame_control) &&
69 !ieee80211_is_pspoll(hdr->frame_control) &&
70 !ieee80211_is_back_req(hdr->frame_control))
76 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
77 struct ieee80211_rx_status *status)
81 /* always present fields */
82 len = sizeof(struct ieee80211_radiotap_header) + 9;
84 if (status->flag & RX_FLAG_TSFT)
86 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
88 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
91 if (len & 1) /* padding for RX_FLAGS if necessary */
98 * ieee80211_add_rx_radiotap_header - add radiotap header
100 * add a radiotap header containing all the fields which the hardware provided.
103 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
105 struct ieee80211_rate *rate,
108 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
109 struct ieee80211_radiotap_header *rthdr;
113 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
114 memset(rthdr, 0, rtap_len);
116 /* radiotap header, set always present flags */
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
119 (1 << IEEE80211_RADIOTAP_CHANNEL) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
122 rthdr->it_len = cpu_to_le16(rtap_len);
124 pos = (unsigned char *)(rthdr+1);
126 /* the order of the following fields is important */
128 /* IEEE80211_RADIOTAP_TSFT */
129 if (status->flag & RX_FLAG_TSFT) {
130 put_unaligned_le64(status->mactime, pos);
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
136 /* IEEE80211_RADIOTAP_FLAGS */
137 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
138 *pos |= IEEE80211_RADIOTAP_F_FCS;
139 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
140 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
141 if (status->flag & RX_FLAG_SHORTPRE)
142 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
145 /* IEEE80211_RADIOTAP_RATE */
146 if (status->flag & RX_FLAG_HT) {
148 * TODO: add following information into radiotap header once
149 * suitable fields are defined for it:
150 * - MCS index (status->rate_idx)
151 * - HT40 (status->flag & RX_FLAG_40MHZ)
152 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
156 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
157 *pos = rate->bitrate / 5;
161 /* IEEE80211_RADIOTAP_CHANNEL */
162 put_unaligned_le16(status->freq, pos);
164 if (status->band == IEEE80211_BAND_5GHZ)
165 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
167 else if (rate->flags & IEEE80211_RATE_ERP_G)
168 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
171 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
175 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
176 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
177 *pos = status->signal;
179 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
183 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
184 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
185 *pos = status->noise;
187 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
191 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
193 /* IEEE80211_RADIOTAP_ANTENNA */
194 *pos = status->antenna;
197 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
199 /* IEEE80211_RADIOTAP_RX_FLAGS */
200 /* ensure 2 byte alignment for the 2 byte field as required */
201 if ((pos - (u8 *)rthdr) & 1)
203 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
204 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
205 put_unaligned_le16(rx_flags, pos);
210 * This function copies a received frame to all monitor interfaces and
211 * returns a cleaned-up SKB that no longer includes the FCS nor the
212 * radiotap header the driver might have added.
214 static struct sk_buff *
215 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
216 struct ieee80211_rate *rate)
218 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
219 struct ieee80211_sub_if_data *sdata;
220 int needed_headroom = 0;
221 struct sk_buff *skb, *skb2;
222 struct net_device *prev_dev = NULL;
223 int present_fcs_len = 0;
226 * First, we may need to make a copy of the skb because
227 * (1) we need to modify it for radiotap (if not present), and
228 * (2) the other RX handlers will modify the skb we got.
230 * We don't need to, of course, if we aren't going to return
231 * the SKB because it has a bad FCS/PLCP checksum.
234 /* room for the radiotap header based on driver features */
235 needed_headroom = ieee80211_rx_radiotap_len(local, status);
237 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
238 present_fcs_len = FCS_LEN;
240 if (!local->monitors) {
241 if (should_drop_frame(origskb, present_fcs_len)) {
242 dev_kfree_skb(origskb);
246 return remove_monitor_info(local, origskb);
249 if (should_drop_frame(origskb, present_fcs_len)) {
250 /* only need to expand headroom if necessary */
255 * This shouldn't trigger often because most devices have an
256 * RX header they pull before we get here, and that should
257 * be big enough for our radiotap information. We should
258 * probably export the length to drivers so that we can have
259 * them allocate enough headroom to start with.
261 if (skb_headroom(skb) < needed_headroom &&
262 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
268 * Need to make a copy and possibly remove radiotap header
269 * and FCS from the original.
271 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
273 origskb = remove_monitor_info(local, origskb);
279 /* prepend radiotap information */
280 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
282 skb_reset_mac_header(skb);
283 skb->ip_summed = CHECKSUM_UNNECESSARY;
284 skb->pkt_type = PACKET_OTHERHOST;
285 skb->protocol = htons(ETH_P_802_2);
287 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
288 if (!netif_running(sdata->dev))
291 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
294 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
298 skb2 = skb_clone(skb, GFP_ATOMIC);
300 skb2->dev = prev_dev;
305 prev_dev = sdata->dev;
306 sdata->dev->stats.rx_packets++;
307 sdata->dev->stats.rx_bytes += skb->len;
320 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
322 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
325 /* does the frame have a qos control field? */
326 if (ieee80211_is_data_qos(hdr->frame_control)) {
327 u8 *qc = ieee80211_get_qos_ctl(hdr);
328 /* frame has qos control */
329 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
330 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
331 rx->flags |= IEEE80211_RX_AMSDU;
333 rx->flags &= ~IEEE80211_RX_AMSDU;
336 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
338 * Sequence numbers for management frames, QoS data
339 * frames with a broadcast/multicast address in the
340 * Address 1 field, and all non-QoS data frames sent
341 * by QoS STAs are assigned using an additional single
342 * modulo-4096 counter, [...]
344 * We also use that counter for non-QoS STAs.
346 tid = NUM_RX_DATA_QUEUES - 1;
350 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
351 * For now, set skb->priority to 0 for other cases. */
352 rx->skb->priority = (tid > 7) ? 0 : tid;
356 * DOC: Packet alignment
358 * Drivers always need to pass packets that are aligned to two-byte boundaries
361 * Additionally, should, if possible, align the payload data in a way that
362 * guarantees that the contained IP header is aligned to a four-byte
363 * boundary. In the case of regular frames, this simply means aligning the
364 * payload to a four-byte boundary (because either the IP header is directly
365 * contained, or IV/RFC1042 headers that have a length divisible by four are
368 * With A-MSDU frames, however, the payload data address must yield two modulo
369 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
370 * push the IP header further back to a multiple of four again. Thankfully, the
371 * specs were sane enough this time around to require padding each A-MSDU
372 * subframe to a length that is a multiple of four.
374 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
375 * the payload is not supported, the driver is required to move the 802.11
376 * header to be directly in front of the payload in that case.
378 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
383 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
387 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
388 "unaligned packet at 0x%p\n", rx->skb->data))
391 if (!ieee80211_is_data_present(hdr->frame_control))
394 hdrlen = ieee80211_hdrlen(hdr->frame_control);
395 if (rx->flags & IEEE80211_RX_AMSDU)
397 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
398 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
404 static ieee80211_rx_result debug_noinline
405 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
407 struct ieee80211_local *local = rx->local;
408 struct sk_buff *skb = rx->skb;
410 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
411 return ieee80211_scan_rx(rx->sdata, skb);
413 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
414 (rx->flags & IEEE80211_RX_IN_SCAN))) {
415 /* drop all the other packets during a software scan anyway */
416 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
421 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
422 /* scanning finished during invoking of handlers */
423 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
424 return RX_DROP_UNUSABLE;
431 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
433 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
435 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
438 return ieee80211_is_robust_mgmt_frame(hdr);
442 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
444 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
446 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
449 return ieee80211_is_robust_mgmt_frame(hdr);
453 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
454 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
456 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
457 struct ieee80211_mmie *mmie;
459 if (skb->len < 24 + sizeof(*mmie) ||
460 !is_multicast_ether_addr(hdr->da))
463 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
464 return -1; /* not a robust management frame */
466 mmie = (struct ieee80211_mmie *)
467 (skb->data + skb->len - sizeof(*mmie));
468 if (mmie->element_id != WLAN_EID_MMIE ||
469 mmie->length != sizeof(*mmie) - 2)
472 return le16_to_cpu(mmie->key_id);
476 static ieee80211_rx_result
477 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
480 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
481 char *dev_addr = rx->dev->dev_addr;
483 if (ieee80211_is_data(hdr->frame_control)) {
484 if (is_multicast_ether_addr(hdr->addr1)) {
485 if (ieee80211_has_tods(hdr->frame_control) ||
486 !ieee80211_has_fromds(hdr->frame_control))
487 return RX_DROP_MONITOR;
488 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
489 return RX_DROP_MONITOR;
491 if (!ieee80211_has_a4(hdr->frame_control))
492 return RX_DROP_MONITOR;
493 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
494 return RX_DROP_MONITOR;
498 /* If there is not an established peer link and this is not a peer link
499 * establisment frame, beacon or probe, drop the frame.
502 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
503 struct ieee80211_mgmt *mgmt;
505 if (!ieee80211_is_mgmt(hdr->frame_control))
506 return RX_DROP_MONITOR;
508 if (ieee80211_is_action(hdr->frame_control)) {
509 mgmt = (struct ieee80211_mgmt *)hdr;
510 if (mgmt->u.action.category != PLINK_CATEGORY)
511 return RX_DROP_MONITOR;
515 if (ieee80211_is_probe_req(hdr->frame_control) ||
516 ieee80211_is_probe_resp(hdr->frame_control) ||
517 ieee80211_is_beacon(hdr->frame_control))
520 return RX_DROP_MONITOR;
524 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
526 if (ieee80211_is_data(hdr->frame_control) &&
527 is_multicast_ether_addr(hdr->addr1) &&
528 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
529 return RX_DROP_MONITOR;
536 static ieee80211_rx_result debug_noinline
537 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
539 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
541 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
542 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
543 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
544 rx->sta->last_seq_ctrl[rx->queue] ==
546 if (rx->flags & IEEE80211_RX_RA_MATCH) {
547 rx->local->dot11FrameDuplicateCount++;
548 rx->sta->num_duplicates++;
550 return RX_DROP_MONITOR;
552 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
555 if (unlikely(rx->skb->len < 16)) {
556 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
557 return RX_DROP_MONITOR;
560 /* Drop disallowed frame classes based on STA auth/assoc state;
561 * IEEE 802.11, Chap 5.5.
563 * mac80211 filters only based on association state, i.e. it drops
564 * Class 3 frames from not associated stations. hostapd sends
565 * deauth/disassoc frames when needed. In addition, hostapd is
566 * responsible for filtering on both auth and assoc states.
569 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
570 return ieee80211_rx_mesh_check(rx);
572 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
573 ieee80211_is_pspoll(hdr->frame_control)) &&
574 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
575 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
576 if ((!ieee80211_has_fromds(hdr->frame_control) &&
577 !ieee80211_has_tods(hdr->frame_control) &&
578 ieee80211_is_data(hdr->frame_control)) ||
579 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
580 /* Drop IBSS frames and frames for other hosts
582 return RX_DROP_MONITOR;
585 return RX_DROP_MONITOR;
592 static ieee80211_rx_result debug_noinline
593 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
595 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
598 ieee80211_rx_result result = RX_DROP_UNUSABLE;
599 struct ieee80211_key *stakey = NULL;
600 int mmie_keyidx = -1;
605 * There are four types of keys:
607 * - IGTK (group keys for management frames)
608 * - PTK (pairwise keys)
609 * - STK (station-to-station pairwise keys)
611 * When selecting a key, we have to distinguish between multicast
612 * (including broadcast) and unicast frames, the latter can only
613 * use PTKs and STKs while the former always use GTKs and IGTKs.
614 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
615 * unicast frames can also use key indices like GTKs. Hence, if we
616 * don't have a PTK/STK we check the key index for a WEP key.
618 * Note that in a regular BSS, multicast frames are sent by the
619 * AP only, associated stations unicast the frame to the AP first
620 * which then multicasts it on their behalf.
622 * There is also a slight problem in IBSS mode: GTKs are negotiated
623 * with each station, that is something we don't currently handle.
624 * The spec seems to expect that one negotiates the same key with
625 * every station but there's no such requirement; VLANs could be
630 * No point in finding a key and decrypting if the frame is neither
631 * addressed to us nor a multicast frame.
633 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
637 stakey = rcu_dereference(rx->sta->key);
639 if (!ieee80211_has_protected(hdr->frame_control))
640 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
642 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
644 /* Skip decryption if the frame is not protected. */
645 if (!ieee80211_has_protected(hdr->frame_control))
647 } else if (mmie_keyidx >= 0) {
648 /* Broadcast/multicast robust management frame / BIP */
649 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
650 (rx->status->flag & RX_FLAG_IV_STRIPPED))
653 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
654 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
655 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
656 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
657 } else if (!ieee80211_has_protected(hdr->frame_control)) {
659 * The frame was not protected, so skip decryption. However, we
660 * need to set rx->key if there is a key that could have been
661 * used so that the frame may be dropped if encryption would
662 * have been expected.
664 struct ieee80211_key *key = NULL;
665 if (ieee80211_is_mgmt(hdr->frame_control) &&
666 is_multicast_ether_addr(hdr->addr1) &&
667 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
669 else if ((key = rcu_dereference(rx->sdata->default_key)))
674 * The device doesn't give us the IV so we won't be
675 * able to look up the key. That's ok though, we
676 * don't need to decrypt the frame, we just won't
677 * be able to keep statistics accurate.
678 * Except for key threshold notifications, should
679 * we somehow allow the driver to tell us which key
680 * the hardware used if this flag is set?
682 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
683 (rx->status->flag & RX_FLAG_IV_STRIPPED))
686 hdrlen = ieee80211_hdrlen(hdr->frame_control);
688 if (rx->skb->len < 8 + hdrlen)
689 return RX_DROP_UNUSABLE; /* TODO: count this? */
692 * no need to call ieee80211_wep_get_keyidx,
693 * it verifies a bunch of things we've done already
695 keyidx = rx->skb->data[hdrlen + 3] >> 6;
697 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
700 * RSNA-protected unicast frames should always be sent with
701 * pairwise or station-to-station keys, but for WEP we allow
702 * using a key index as well.
704 if (rx->key && rx->key->conf.alg != ALG_WEP &&
705 !is_multicast_ether_addr(hdr->addr1))
710 rx->key->tx_rx_count++;
711 /* TODO: add threshold stuff again */
713 return RX_DROP_MONITOR;
716 /* Check for weak IVs if possible */
717 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
718 ieee80211_is_data(hdr->frame_control) &&
719 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
720 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
721 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
722 rx->sta->wep_weak_iv_count++;
724 switch (rx->key->conf.alg) {
726 result = ieee80211_crypto_wep_decrypt(rx);
729 result = ieee80211_crypto_tkip_decrypt(rx);
732 result = ieee80211_crypto_ccmp_decrypt(rx);
735 result = ieee80211_crypto_aes_cmac_decrypt(rx);
739 /* either the frame has been decrypted or will be dropped */
740 rx->status->flag |= RX_FLAG_DECRYPTED;
745 static ieee80211_rx_result debug_noinline
746 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
748 struct ieee80211_local *local;
749 struct ieee80211_hdr *hdr;
754 hdr = (struct ieee80211_hdr *) skb->data;
756 if (!local->pspolling)
759 if (!ieee80211_has_fromds(hdr->frame_control))
760 /* this is not from AP */
763 if (!ieee80211_is_data(hdr->frame_control))
766 if (!ieee80211_has_moredata(hdr->frame_control)) {
767 /* AP has no more frames buffered for us */
768 local->pspolling = false;
772 /* more data bit is set, let's request a new frame from the AP */
773 ieee80211_send_pspoll(local, rx->sdata);
778 static void ap_sta_ps_start(struct sta_info *sta)
780 struct ieee80211_sub_if_data *sdata = sta->sdata;
781 struct ieee80211_local *local = sdata->local;
783 atomic_inc(&sdata->bss->num_sta_ps);
784 set_sta_flags(sta, WLAN_STA_PS);
785 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
786 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
787 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
788 sdata->dev->name, sta->sta.addr, sta->sta.aid);
789 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
792 static int ap_sta_ps_end(struct sta_info *sta)
794 struct ieee80211_sub_if_data *sdata = sta->sdata;
795 struct ieee80211_local *local = sdata->local;
798 atomic_dec(&sdata->bss->num_sta_ps);
800 clear_sta_flags(sta, WLAN_STA_PS);
801 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
803 if (!skb_queue_empty(&sta->ps_tx_buf))
804 sta_info_clear_tim_bit(sta);
806 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
807 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
808 sdata->dev->name, sta->sta.addr, sta->sta.aid);
809 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
811 /* Send all buffered frames to the station */
812 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
813 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
815 local->total_ps_buffered -= buffered;
817 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
818 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
819 "since STA not sleeping anymore\n", sdata->dev->name,
820 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
821 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
826 static ieee80211_rx_result debug_noinline
827 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
829 struct sta_info *sta = rx->sta;
830 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
836 * Update last_rx only for IBSS packets which are for the current
837 * BSSID to avoid keeping the current IBSS network alive in cases
838 * where other STAs start using different BSSID.
840 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
841 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
842 NL80211_IFTYPE_ADHOC);
843 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
844 sta->last_rx = jiffies;
845 } else if (!is_multicast_ether_addr(hdr->addr1)) {
847 * Mesh beacons will update last_rx when if they are found to
848 * match the current local configuration when processed.
850 sta->last_rx = jiffies;
853 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
856 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
857 ieee80211_sta_rx_notify(rx->sdata, hdr);
860 sta->rx_bytes += rx->skb->len;
861 sta->last_signal = rx->status->signal;
862 sta->last_noise = rx->status->noise;
865 * Change STA power saving mode only at the end of a frame
868 if (!ieee80211_has_morefrags(hdr->frame_control) &&
869 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
870 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
871 if (test_sta_flags(sta, WLAN_STA_PS)) {
873 * Ignore doze->wake transitions that are
874 * indicated by non-data frames, the standard
875 * is unclear here, but for example going to
876 * PS mode and then scanning would cause a
877 * doze->wake transition for the probe request,
878 * and that is clearly undesirable.
880 if (ieee80211_is_data(hdr->frame_control) &&
881 !ieee80211_has_pm(hdr->frame_control))
882 rx->sent_ps_buffered += ap_sta_ps_end(sta);
884 if (ieee80211_has_pm(hdr->frame_control))
885 ap_sta_ps_start(sta);
889 /* Drop data::nullfunc frames silently, since they are used only to
890 * control station power saving mode. */
891 if (ieee80211_is_nullfunc(hdr->frame_control)) {
892 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
893 /* Update counter and free packet here to avoid counting this
894 * as a dropped packed. */
896 dev_kfree_skb(rx->skb);
901 } /* ieee80211_rx_h_sta_process */
903 static inline struct ieee80211_fragment_entry *
904 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
905 unsigned int frag, unsigned int seq, int rx_queue,
906 struct sk_buff **skb)
908 struct ieee80211_fragment_entry *entry;
911 idx = sdata->fragment_next;
912 entry = &sdata->fragments[sdata->fragment_next++];
913 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
914 sdata->fragment_next = 0;
916 if (!skb_queue_empty(&entry->skb_list)) {
917 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
918 struct ieee80211_hdr *hdr =
919 (struct ieee80211_hdr *) entry->skb_list.next->data;
920 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
921 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
922 "addr1=%pM addr2=%pM\n",
923 sdata->dev->name, idx,
924 jiffies - entry->first_frag_time, entry->seq,
925 entry->last_frag, hdr->addr1, hdr->addr2);
927 __skb_queue_purge(&entry->skb_list);
930 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
932 entry->first_frag_time = jiffies;
934 entry->rx_queue = rx_queue;
935 entry->last_frag = frag;
937 entry->extra_len = 0;
942 static inline struct ieee80211_fragment_entry *
943 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
944 unsigned int frag, unsigned int seq,
945 int rx_queue, struct ieee80211_hdr *hdr)
947 struct ieee80211_fragment_entry *entry;
950 idx = sdata->fragment_next;
951 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
952 struct ieee80211_hdr *f_hdr;
956 idx = IEEE80211_FRAGMENT_MAX - 1;
958 entry = &sdata->fragments[idx];
959 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
960 entry->rx_queue != rx_queue ||
961 entry->last_frag + 1 != frag)
964 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
967 * Check ftype and addresses are equal, else check next fragment
969 if (((hdr->frame_control ^ f_hdr->frame_control) &
970 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
971 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
972 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
975 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
976 __skb_queue_purge(&entry->skb_list);
985 static ieee80211_rx_result debug_noinline
986 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
988 struct ieee80211_hdr *hdr;
991 unsigned int frag, seq;
992 struct ieee80211_fragment_entry *entry;
995 hdr = (struct ieee80211_hdr *)rx->skb->data;
996 fc = hdr->frame_control;
997 sc = le16_to_cpu(hdr->seq_ctrl);
998 frag = sc & IEEE80211_SCTL_FRAG;
1000 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1001 (rx->skb)->len < 24 ||
1002 is_multicast_ether_addr(hdr->addr1))) {
1003 /* not fragmented */
1006 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1008 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1011 /* This is the first fragment of a new frame. */
1012 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1013 rx->queue, &(rx->skb));
1014 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1015 ieee80211_has_protected(fc)) {
1016 /* Store CCMP PN so that we can verify that the next
1017 * fragment has a sequential PN value. */
1019 memcpy(entry->last_pn,
1020 rx->key->u.ccmp.rx_pn[rx->queue],
1026 /* This is a fragment for a frame that should already be pending in
1027 * fragment cache. Add this fragment to the end of the pending entry.
1029 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1031 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1032 return RX_DROP_MONITOR;
1035 /* Verify that MPDUs within one MSDU have sequential PN values.
1036 * (IEEE 802.11i, 8.3.3.4.5) */
1039 u8 pn[CCMP_PN_LEN], *rpn;
1040 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1041 return RX_DROP_UNUSABLE;
1042 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1043 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1048 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1049 if (memcmp(pn, rpn, CCMP_PN_LEN))
1050 return RX_DROP_UNUSABLE;
1051 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1054 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1055 __skb_queue_tail(&entry->skb_list, rx->skb);
1056 entry->last_frag = frag;
1057 entry->extra_len += rx->skb->len;
1058 if (ieee80211_has_morefrags(fc)) {
1063 rx->skb = __skb_dequeue(&entry->skb_list);
1064 if (skb_tailroom(rx->skb) < entry->extra_len) {
1065 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1066 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1068 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1069 __skb_queue_purge(&entry->skb_list);
1070 return RX_DROP_UNUSABLE;
1073 while ((skb = __skb_dequeue(&entry->skb_list))) {
1074 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1078 /* Complete frame has been reassembled - process it now */
1079 rx->flags |= IEEE80211_RX_FRAGMENTED;
1083 rx->sta->rx_packets++;
1084 if (is_multicast_ether_addr(hdr->addr1))
1085 rx->local->dot11MulticastReceivedFrameCount++;
1087 ieee80211_led_rx(rx->local);
1091 static ieee80211_rx_result debug_noinline
1092 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1094 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1095 struct sk_buff *skb;
1096 int no_pending_pkts;
1097 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1099 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1100 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1103 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1104 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1105 return RX_DROP_UNUSABLE;
1107 skb = skb_dequeue(&rx->sta->tx_filtered);
1109 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1111 rx->local->total_ps_buffered--;
1113 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1114 skb_queue_empty(&rx->sta->ps_tx_buf);
1117 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1118 struct ieee80211_hdr *hdr =
1119 (struct ieee80211_hdr *) skb->data;
1122 * Tell TX path to send this frame even though the STA may
1123 * still remain is PS mode after this frame exchange.
1125 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
1127 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1128 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1129 rx->sta->sta.addr, rx->sta->sta.aid,
1130 skb_queue_len(&rx->sta->ps_tx_buf));
1131 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1133 /* Use MoreData flag to indicate whether there are more
1134 * buffered frames for this STA */
1135 if (no_pending_pkts)
1136 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1138 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1140 ieee80211_add_pending_skb(rx->local, skb);
1142 if (no_pending_pkts)
1143 sta_info_clear_tim_bit(rx->sta);
1144 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1145 } else if (!rx->sent_ps_buffered) {
1147 * FIXME: This can be the result of a race condition between
1148 * us expiring a frame and the station polling for it.
1149 * Should we send it a null-func frame indicating we
1150 * have nothing buffered for it?
1152 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1153 "though there are no buffered frames for it\n",
1154 rx->dev->name, rx->sta->sta.addr);
1155 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1158 /* Free PS Poll skb here instead of returning RX_DROP that would
1159 * count as an dropped frame. */
1160 dev_kfree_skb(rx->skb);
1165 static ieee80211_rx_result debug_noinline
1166 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1168 u8 *data = rx->skb->data;
1169 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1171 if (!ieee80211_is_data_qos(hdr->frame_control))
1174 /* remove the qos control field, update frame type and meta-data */
1175 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1176 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1177 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1178 /* change frame type to non QOS */
1179 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1185 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1187 if (unlikely(!rx->sta ||
1188 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1195 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1198 * Pass through unencrypted frames if the hardware has
1199 * decrypted them already.
1201 if (rx->status->flag & RX_FLAG_DECRYPTED)
1204 /* Drop unencrypted frames if key is set. */
1205 if (unlikely(!ieee80211_has_protected(fc) &&
1206 !ieee80211_is_nullfunc(fc) &&
1207 ieee80211_is_data(fc) &&
1208 (rx->key || rx->sdata->drop_unencrypted)))
1210 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1211 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1214 /* BIP does not use Protected field, so need to check MMIE */
1215 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1216 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1220 * When using MFP, Action frames are not allowed prior to
1221 * having configured keys.
1223 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1224 ieee80211_is_robust_mgmt_frame(
1225 (struct ieee80211_hdr *) rx->skb->data)))
1233 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1235 struct net_device *dev = rx->dev;
1236 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1238 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
1242 * requires that rx->skb is a frame with ethernet header
1244 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1246 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1247 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1248 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1251 * Allow EAPOL frames to us/the PAE group address regardless
1252 * of whether the frame was encrypted or not.
1254 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1255 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1256 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1259 if (ieee80211_802_1x_port_control(rx) ||
1260 ieee80211_drop_unencrypted(rx, fc))
1267 * requires that rx->skb is a frame with ethernet header
1270 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1272 struct net_device *dev = rx->dev;
1273 struct ieee80211_local *local = rx->local;
1274 struct sk_buff *skb, *xmit_skb;
1275 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1276 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1277 struct sta_info *dsta;
1282 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1283 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1284 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1285 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1286 if (is_multicast_ether_addr(ehdr->h_dest)) {
1288 * send multicast frames both to higher layers in
1289 * local net stack and back to the wireless medium
1291 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1292 if (!xmit_skb && net_ratelimit())
1293 printk(KERN_DEBUG "%s: failed to clone "
1294 "multicast frame\n", dev->name);
1296 dsta = sta_info_get(local, skb->data);
1297 if (dsta && dsta->sdata->dev == dev) {
1299 * The destination station is associated to
1300 * this AP (in this VLAN), so send the frame
1301 * directly to it and do not pass it to local
1311 int align __maybe_unused;
1313 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1315 * 'align' will only take the values 0 or 2 here
1316 * since all frames are required to be aligned
1317 * to 2-byte boundaries when being passed to
1318 * mac80211. That also explains the __skb_push()
1321 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1323 if (WARN_ON(skb_headroom(skb) < 3)) {
1327 u8 *data = skb->data;
1328 size_t len = skb_headlen(skb);
1330 memmove(skb->data, data, len);
1331 skb_set_tail_pointer(skb, len);
1337 /* deliver to local stack */
1338 skb->protocol = eth_type_trans(skb, dev);
1339 memset(skb->cb, 0, sizeof(skb->cb));
1345 /* send to wireless media */
1346 xmit_skb->protocol = htons(ETH_P_802_3);
1347 skb_reset_network_header(xmit_skb);
1348 skb_reset_mac_header(xmit_skb);
1349 dev_queue_xmit(xmit_skb);
1353 static ieee80211_rx_result debug_noinline
1354 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1356 struct net_device *dev = rx->dev;
1357 struct ieee80211_local *local = rx->local;
1360 struct sk_buff *skb = rx->skb, *frame = NULL;
1361 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1362 __le16 fc = hdr->frame_control;
1363 const struct ethhdr *eth;
1368 if (unlikely(!ieee80211_is_data(fc)))
1371 if (unlikely(!ieee80211_is_data_present(fc)))
1372 return RX_DROP_MONITOR;
1374 if (!(rx->flags & IEEE80211_RX_AMSDU))
1377 err = __ieee80211_data_to_8023(rx);
1379 return RX_DROP_UNUSABLE;
1383 dev->stats.rx_packets++;
1384 dev->stats.rx_bytes += skb->len;
1386 /* skip the wrapping header */
1387 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1389 return RX_DROP_UNUSABLE;
1391 while (skb != frame) {
1393 __be16 len = eth->h_proto;
1394 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1396 remaining = skb->len;
1397 memcpy(dst, eth->h_dest, ETH_ALEN);
1398 memcpy(src, eth->h_source, ETH_ALEN);
1400 padding = ((4 - subframe_len) & 0x3);
1401 /* the last MSDU has no padding */
1402 if (subframe_len > remaining)
1403 return RX_DROP_UNUSABLE;
1405 skb_pull(skb, sizeof(struct ethhdr));
1406 /* if last subframe reuse skb */
1407 if (remaining <= subframe_len + padding)
1411 * Allocate and reserve two bytes more for payload
1412 * alignment since sizeof(struct ethhdr) is 14.
1414 frame = dev_alloc_skb(
1415 ALIGN(local->hw.extra_tx_headroom, 4) +
1419 return RX_DROP_UNUSABLE;
1422 ALIGN(local->hw.extra_tx_headroom, 4) +
1423 sizeof(struct ethhdr) + 2);
1424 memcpy(skb_put(frame, ntohs(len)), skb->data,
1427 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1430 dev_kfree_skb(frame);
1431 return RX_DROP_UNUSABLE;
1435 skb_reset_network_header(frame);
1437 frame->priority = skb->priority;
1440 payload = frame->data;
1441 ethertype = (payload[6] << 8) | payload[7];
1443 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1444 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1445 compare_ether_addr(payload,
1446 bridge_tunnel_header) == 0)) {
1447 /* remove RFC1042 or Bridge-Tunnel
1448 * encapsulation and replace EtherType */
1450 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1451 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1453 memcpy(skb_push(frame, sizeof(__be16)),
1454 &len, sizeof(__be16));
1455 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1456 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1459 if (!ieee80211_frame_allowed(rx, fc)) {
1460 if (skb == frame) /* last frame */
1461 return RX_DROP_UNUSABLE;
1462 dev_kfree_skb(frame);
1466 ieee80211_deliver_skb(rx);
1472 #ifdef CONFIG_MAC80211_MESH
1473 static ieee80211_rx_result
1474 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1476 struct ieee80211_hdr *hdr;
1477 struct ieee80211s_hdr *mesh_hdr;
1478 unsigned int hdrlen;
1479 struct sk_buff *skb = rx->skb, *fwd_skb;
1480 struct ieee80211_local *local = rx->local;
1481 struct ieee80211_sub_if_data *sdata;
1483 hdr = (struct ieee80211_hdr *) skb->data;
1484 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1485 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1486 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1488 if (!ieee80211_is_data(hdr->frame_control))
1493 return RX_DROP_MONITOR;
1495 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1496 struct mesh_path *mppath;
1500 if (is_multicast_ether_addr(hdr->addr1)) {
1501 mpp_addr = hdr->addr3;
1502 proxied_addr = mesh_hdr->eaddr1;
1504 mpp_addr = hdr->addr4;
1505 proxied_addr = mesh_hdr->eaddr2;
1509 mppath = mpp_path_lookup(proxied_addr, sdata);
1511 mpp_path_add(proxied_addr, mpp_addr, sdata);
1513 spin_lock_bh(&mppath->state_lock);
1514 mppath->exp_time = jiffies;
1515 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1516 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1517 spin_unlock_bh(&mppath->state_lock);
1522 /* Frame has reached destination. Don't forward */
1523 if (!is_multicast_ether_addr(hdr->addr1) &&
1524 compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1529 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1531 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1532 dropped_frames_ttl);
1534 struct ieee80211_hdr *fwd_hdr;
1535 struct ieee80211_tx_info *info;
1537 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1539 if (!fwd_skb && net_ratelimit())
1540 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1543 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1544 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1545 info = IEEE80211_SKB_CB(fwd_skb);
1546 memset(info, 0, sizeof(*info));
1547 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1548 info->control.vif = &rx->sdata->vif;
1549 ieee80211_select_queue(local, fwd_skb);
1550 if (is_multicast_ether_addr(fwd_hdr->addr1))
1551 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1556 * Save TA to addr1 to send TA a path error if a
1557 * suitable next hop is not found
1559 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1561 err = mesh_nexthop_lookup(fwd_skb, sdata);
1562 /* Failed to immediately resolve next hop:
1563 * fwded frame was dropped or will be added
1564 * later to the pending skb queue. */
1566 return RX_DROP_MONITOR;
1568 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1571 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1573 ieee80211_add_pending_skb(local, fwd_skb);
1577 if (is_multicast_ether_addr(hdr->addr1) ||
1578 rx->dev->flags & IFF_PROMISC)
1581 return RX_DROP_MONITOR;
1585 static ieee80211_rx_result debug_noinline
1586 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1588 struct net_device *dev = rx->dev;
1589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1590 __le16 fc = hdr->frame_control;
1593 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1596 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1597 return RX_DROP_MONITOR;
1599 err = __ieee80211_data_to_8023(rx);
1601 return RX_DROP_UNUSABLE;
1603 if (!ieee80211_frame_allowed(rx, fc))
1604 return RX_DROP_MONITOR;
1608 dev->stats.rx_packets++;
1609 dev->stats.rx_bytes += rx->skb->len;
1611 ieee80211_deliver_skb(rx);
1616 static ieee80211_rx_result debug_noinline
1617 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1619 struct ieee80211_local *local = rx->local;
1620 struct ieee80211_hw *hw = &local->hw;
1621 struct sk_buff *skb = rx->skb;
1622 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1623 struct tid_ampdu_rx *tid_agg_rx;
1627 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1630 if (ieee80211_is_back_req(bar->frame_control)) {
1633 tid = le16_to_cpu(bar->control) >> 12;
1634 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1635 != HT_AGG_STATE_OPERATIONAL)
1637 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1639 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1641 /* reset session timer */
1642 if (tid_agg_rx->timeout)
1643 mod_timer(&tid_agg_rx->session_timer,
1644 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1646 /* manage reordering buffer according to requested */
1647 /* sequence number */
1649 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1652 return RX_DROP_UNUSABLE;
1658 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1659 struct ieee80211_mgmt *mgmt,
1662 struct ieee80211_local *local = sdata->local;
1663 struct sk_buff *skb;
1664 struct ieee80211_mgmt *resp;
1666 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1667 /* Not to own unicast address */
1671 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1672 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1673 /* Not from the current AP or not associated yet. */
1677 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1678 /* Too short SA Query request frame */
1682 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1686 skb_reserve(skb, local->hw.extra_tx_headroom);
1687 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1688 memset(resp, 0, 24);
1689 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1690 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1691 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1692 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1693 IEEE80211_STYPE_ACTION);
1694 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1695 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1696 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1697 memcpy(resp->u.action.u.sa_query.trans_id,
1698 mgmt->u.action.u.sa_query.trans_id,
1699 WLAN_SA_QUERY_TR_ID_LEN);
1701 ieee80211_tx_skb(sdata, skb, 1);
1704 static ieee80211_rx_result debug_noinline
1705 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1707 struct ieee80211_local *local = rx->local;
1708 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1709 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1710 int len = rx->skb->len;
1712 if (!ieee80211_is_action(mgmt->frame_control))
1716 return RX_DROP_MONITOR;
1718 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1719 return RX_DROP_MONITOR;
1721 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1722 return RX_DROP_MONITOR;
1724 /* all categories we currently handle have action_code */
1725 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1726 return RX_DROP_MONITOR;
1728 switch (mgmt->u.action.category) {
1729 case WLAN_CATEGORY_BACK:
1731 * The aggregation code is not prepared to handle
1732 * anything but STA/AP due to the BSSID handling;
1733 * IBSS could work in the code but isn't supported
1734 * by drivers or the standard.
1736 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1737 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1738 sdata->vif.type != NL80211_IFTYPE_AP)
1739 return RX_DROP_MONITOR;
1741 switch (mgmt->u.action.u.addba_req.action_code) {
1742 case WLAN_ACTION_ADDBA_REQ:
1743 if (len < (IEEE80211_MIN_ACTION_SIZE +
1744 sizeof(mgmt->u.action.u.addba_req)))
1745 return RX_DROP_MONITOR;
1746 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1748 case WLAN_ACTION_ADDBA_RESP:
1749 if (len < (IEEE80211_MIN_ACTION_SIZE +
1750 sizeof(mgmt->u.action.u.addba_resp)))
1751 return RX_DROP_MONITOR;
1752 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1754 case WLAN_ACTION_DELBA:
1755 if (len < (IEEE80211_MIN_ACTION_SIZE +
1756 sizeof(mgmt->u.action.u.delba)))
1757 return RX_DROP_MONITOR;
1758 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1762 case WLAN_CATEGORY_SPECTRUM_MGMT:
1763 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1764 return RX_DROP_MONITOR;
1766 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1767 return RX_DROP_MONITOR;
1769 switch (mgmt->u.action.u.measurement.action_code) {
1770 case WLAN_ACTION_SPCT_MSR_REQ:
1771 if (len < (IEEE80211_MIN_ACTION_SIZE +
1772 sizeof(mgmt->u.action.u.measurement)))
1773 return RX_DROP_MONITOR;
1774 ieee80211_process_measurement_req(sdata, mgmt, len);
1776 case WLAN_ACTION_SPCT_CHL_SWITCH:
1777 if (len < (IEEE80211_MIN_ACTION_SIZE +
1778 sizeof(mgmt->u.action.u.chan_switch)))
1779 return RX_DROP_MONITOR;
1781 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1782 return RX_DROP_MONITOR;
1784 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1785 return RX_DROP_MONITOR;
1787 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1790 case WLAN_CATEGORY_SA_QUERY:
1791 if (len < (IEEE80211_MIN_ACTION_SIZE +
1792 sizeof(mgmt->u.action.u.sa_query)))
1793 return RX_DROP_MONITOR;
1794 switch (mgmt->u.action.u.sa_query.action) {
1795 case WLAN_ACTION_SA_QUERY_REQUEST:
1796 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1797 return RX_DROP_MONITOR;
1798 ieee80211_process_sa_query_req(sdata, mgmt, len);
1800 case WLAN_ACTION_SA_QUERY_RESPONSE:
1802 * SA Query response is currently only used in AP mode
1803 * and it is processed in user space.
1812 rx->sta->rx_packets++;
1813 dev_kfree_skb(rx->skb);
1817 static ieee80211_rx_result debug_noinline
1818 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1820 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1821 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1823 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1824 return RX_DROP_MONITOR;
1826 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1827 return RX_DROP_MONITOR;
1829 if (ieee80211_vif_is_mesh(&sdata->vif))
1830 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
1832 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
1833 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
1835 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1836 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1838 return RX_DROP_MONITOR;
1841 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
1842 struct ieee80211_rx_data *rx)
1845 unsigned int hdrlen;
1847 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1848 if (rx->skb->len >= hdrlen + 4)
1849 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1855 * Some hardware seem to generate incorrect Michael MIC
1856 * reports; ignore them to avoid triggering countermeasures.
1861 if (!ieee80211_has_protected(hdr->frame_control))
1864 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1866 * APs with pairwise keys should never receive Michael MIC
1867 * errors for non-zero keyidx because these are reserved for
1868 * group keys and only the AP is sending real multicast
1869 * frames in the BSS.
1874 if (!ieee80211_is_data(hdr->frame_control) &&
1875 !ieee80211_is_auth(hdr->frame_control))
1878 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1881 dev_kfree_skb(rx->skb);
1885 /* TODO: use IEEE80211_RX_FRAGMENTED */
1886 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1888 struct ieee80211_sub_if_data *sdata;
1889 struct ieee80211_local *local = rx->local;
1890 struct ieee80211_rtap_hdr {
1891 struct ieee80211_radiotap_header hdr;
1896 } __attribute__ ((packed)) *rthdr;
1897 struct sk_buff *skb = rx->skb, *skb2;
1898 struct net_device *prev_dev = NULL;
1899 struct ieee80211_rx_status *status = rx->status;
1901 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1904 if (skb_headroom(skb) < sizeof(*rthdr) &&
1905 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1908 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1909 memset(rthdr, 0, sizeof(*rthdr));
1910 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1911 rthdr->hdr.it_present =
1912 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1913 (1 << IEEE80211_RADIOTAP_RATE) |
1914 (1 << IEEE80211_RADIOTAP_CHANNEL));
1916 rthdr->rate = rx->rate->bitrate / 5;
1917 rthdr->chan_freq = cpu_to_le16(status->freq);
1919 if (status->band == IEEE80211_BAND_5GHZ)
1920 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1921 IEEE80211_CHAN_5GHZ);
1923 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1924 IEEE80211_CHAN_2GHZ);
1926 skb_set_mac_header(skb, 0);
1927 skb->ip_summed = CHECKSUM_UNNECESSARY;
1928 skb->pkt_type = PACKET_OTHERHOST;
1929 skb->protocol = htons(ETH_P_802_2);
1931 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1932 if (!netif_running(sdata->dev))
1935 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1936 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1940 skb2 = skb_clone(skb, GFP_ATOMIC);
1942 skb2->dev = prev_dev;
1947 prev_dev = sdata->dev;
1948 sdata->dev->stats.rx_packets++;
1949 sdata->dev->stats.rx_bytes += skb->len;
1953 skb->dev = prev_dev;
1959 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1967 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1968 struct ieee80211_rx_data *rx,
1969 struct sk_buff *skb)
1971 ieee80211_rx_result res = RX_DROP_MONITOR;
1975 rx->dev = sdata->dev;
1977 #define CALL_RXH(rxh) \
1980 if (res != RX_CONTINUE) \
1984 CALL_RXH(ieee80211_rx_h_passive_scan)
1985 CALL_RXH(ieee80211_rx_h_check)
1986 CALL_RXH(ieee80211_rx_h_decrypt)
1987 CALL_RXH(ieee80211_rx_h_check_more_data)
1988 CALL_RXH(ieee80211_rx_h_sta_process)
1989 CALL_RXH(ieee80211_rx_h_defragment)
1990 CALL_RXH(ieee80211_rx_h_ps_poll)
1991 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1992 /* must be after MMIC verify so header is counted in MPDU mic */
1993 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1994 CALL_RXH(ieee80211_rx_h_amsdu)
1995 #ifdef CONFIG_MAC80211_MESH
1996 if (ieee80211_vif_is_mesh(&sdata->vif))
1997 CALL_RXH(ieee80211_rx_h_mesh_fwding);
1999 CALL_RXH(ieee80211_rx_h_data)
2000 CALL_RXH(ieee80211_rx_h_ctrl)
2001 CALL_RXH(ieee80211_rx_h_action)
2002 CALL_RXH(ieee80211_rx_h_mgmt)
2008 case RX_DROP_MONITOR:
2009 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2011 rx->sta->rx_dropped++;
2014 ieee80211_rx_cooked_monitor(rx);
2016 case RX_DROP_UNUSABLE:
2017 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2019 rx->sta->rx_dropped++;
2020 dev_kfree_skb(rx->skb);
2023 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2028 /* main receive path */
2030 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2031 struct ieee80211_rx_data *rx,
2032 struct ieee80211_hdr *hdr)
2034 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
2035 int multicast = is_multicast_ether_addr(hdr->addr1);
2037 switch (sdata->vif.type) {
2038 case NL80211_IFTYPE_STATION:
2042 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
2043 if (!(sdata->dev->flags & IFF_PROMISC))
2045 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2048 case NL80211_IFTYPE_ADHOC:
2051 if (ieee80211_is_beacon(hdr->frame_control)) {
2054 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2055 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2057 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2058 } else if (!multicast &&
2059 compare_ether_addr(sdata->dev->dev_addr,
2061 if (!(sdata->dev->flags & IFF_PROMISC))
2063 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2064 } else if (!rx->sta) {
2066 if (rx->status->flag & RX_FLAG_HT)
2067 rate_idx = 0; /* TODO: HT rates */
2069 rate_idx = rx->status->rate_idx;
2070 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2074 case NL80211_IFTYPE_MESH_POINT:
2076 compare_ether_addr(sdata->dev->dev_addr,
2078 if (!(sdata->dev->flags & IFF_PROMISC))
2081 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2084 case NL80211_IFTYPE_AP_VLAN:
2085 case NL80211_IFTYPE_AP:
2087 if (compare_ether_addr(sdata->dev->dev_addr,
2090 } else if (!ieee80211_bssid_match(bssid,
2091 sdata->dev->dev_addr)) {
2092 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2094 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2097 case NL80211_IFTYPE_WDS:
2098 if (bssid || !ieee80211_is_data(hdr->frame_control))
2100 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2103 case NL80211_IFTYPE_MONITOR:
2104 /* take everything */
2106 case NL80211_IFTYPE_UNSPECIFIED:
2107 case __NL80211_IFTYPE_AFTER_LAST:
2108 /* should never get here */
2117 * This is the actual Rx frames handler. as it blongs to Rx path it must
2118 * be called with rcu_read_lock protection.
2120 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2121 struct sk_buff *skb,
2122 struct ieee80211_rate *rate)
2124 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2125 struct ieee80211_local *local = hw_to_local(hw);
2126 struct ieee80211_sub_if_data *sdata;
2127 struct ieee80211_hdr *hdr;
2128 struct ieee80211_rx_data rx;
2130 struct ieee80211_sub_if_data *prev = NULL;
2131 struct sk_buff *skb_new;
2133 hdr = (struct ieee80211_hdr *)skb->data;
2134 memset(&rx, 0, sizeof(rx));
2141 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2142 local->dot11ReceivedFragmentCount++;
2144 rx.sta = sta_info_get(local, hdr->addr2);
2146 rx.sdata = rx.sta->sdata;
2147 rx.dev = rx.sta->sdata->dev;
2150 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
2151 ieee80211_rx_michael_mic_report(hdr, &rx);
2155 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2156 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2157 rx.flags |= IEEE80211_RX_IN_SCAN;
2159 ieee80211_parse_qos(&rx);
2160 ieee80211_verify_alignment(&rx);
2164 if (rx.sdata && ieee80211_is_data(hdr->frame_control)) {
2165 rx.flags |= IEEE80211_RX_RA_MATCH;
2166 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2169 } else list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2170 if (!netif_running(sdata->dev))
2173 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2174 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2177 rx.flags |= IEEE80211_RX_RA_MATCH;
2178 prepares = prepare_for_handlers(sdata, &rx, hdr);
2184 * frame is destined for this interface, but if it's not
2185 * also for the previous one we handle that after the
2186 * loop to avoid copying the SKB once too much
2195 * frame was destined for the previous interface
2196 * so invoke RX handlers for it
2199 skb_new = skb_copy(skb, GFP_ATOMIC);
2201 if (net_ratelimit())
2202 printk(KERN_DEBUG "%s: failed to copy "
2203 "multicast frame for %s\n",
2204 wiphy_name(local->hw.wiphy),
2208 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2212 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2217 #define SEQ_MODULO 0x1000
2218 #define SEQ_MASK 0xfff
2220 static inline int seq_less(u16 sq1, u16 sq2)
2222 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2225 static inline u16 seq_inc(u16 sq)
2227 return (sq + 1) & SEQ_MASK;
2230 static inline u16 seq_sub(u16 sq1, u16 sq2)
2232 return (sq1 - sq2) & SEQ_MASK;
2236 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2237 struct tid_ampdu_rx *tid_agg_rx,
2240 struct ieee80211_supported_band *sband;
2241 struct ieee80211_rate *rate;
2242 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2243 struct ieee80211_rx_status *status;
2248 status = IEEE80211_SKB_RXCB(skb);
2250 /* release the reordered frames to stack */
2251 sband = hw->wiphy->bands[status->band];
2252 if (status->flag & RX_FLAG_HT)
2253 rate = sband->bitrates; /* TODO: HT rates */
2255 rate = &sband->bitrates[status->rate_idx];
2256 __ieee80211_rx_handle_packet(hw, skb, rate);
2257 tid_agg_rx->stored_mpdu_num--;
2258 tid_agg_rx->reorder_buf[index] = NULL;
2261 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2266 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2267 * the skb was added to the buffer longer than this time ago, the earlier
2268 * frames that have not yet been received are assumed to be lost and the skb
2269 * can be released for processing. This may also release other skb's from the
2270 * reorder buffer if there are no additional gaps between the frames.
2272 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2275 * As it function blongs to Rx path it must be called with
2276 * the proper rcu_read_lock protection for its flow.
2278 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2279 struct tid_ampdu_rx *tid_agg_rx,
2280 struct sk_buff *skb,
2284 u16 head_seq_num, buf_size;
2287 buf_size = tid_agg_rx->buf_size;
2288 head_seq_num = tid_agg_rx->head_seq_num;
2290 /* frame with out of date sequence number */
2291 if (seq_less(mpdu_seq_num, head_seq_num)) {
2296 /* if frame sequence number exceeds our buffering window size or
2297 * block Ack Request arrived - release stored frames */
2298 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2299 /* new head to the ordering buffer */
2301 head_seq_num = mpdu_seq_num;
2304 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2305 /* release stored frames up to new head to stack */
2306 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2307 index = seq_sub(tid_agg_rx->head_seq_num,
2309 % tid_agg_rx->buf_size;
2310 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2317 /* now the new frame is always in the range of the reordering */
2319 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2320 % tid_agg_rx->buf_size;
2321 /* check if we already stored this frame */
2322 if (tid_agg_rx->reorder_buf[index]) {
2327 /* if arrived mpdu is in the right order and nothing else stored */
2328 /* release it immediately */
2329 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2330 tid_agg_rx->stored_mpdu_num == 0) {
2331 tid_agg_rx->head_seq_num =
2332 seq_inc(tid_agg_rx->head_seq_num);
2336 /* put the frame in the reordering buffer */
2337 tid_agg_rx->reorder_buf[index] = skb;
2338 tid_agg_rx->reorder_time[index] = jiffies;
2339 tid_agg_rx->stored_mpdu_num++;
2340 /* release the buffer until next missing frame */
2341 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2342 % tid_agg_rx->buf_size;
2343 if (!tid_agg_rx->reorder_buf[index] &&
2344 tid_agg_rx->stored_mpdu_num > 1) {
2346 * No buffers ready to be released, but check whether any
2347 * frames in the reorder buffer have timed out.
2351 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2352 j = (j + 1) % tid_agg_rx->buf_size) {
2353 if (tid_agg_rx->reorder_buf[j] == NULL) {
2357 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2361 #ifdef CONFIG_MAC80211_HT_DEBUG
2362 if (net_ratelimit())
2363 printk(KERN_DEBUG "%s: release an RX reorder "
2364 "frame due to timeout on earlier "
2366 wiphy_name(hw->wiphy));
2368 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2371 * Increment the head seq# also for the skipped slots.
2373 tid_agg_rx->head_seq_num =
2374 (tid_agg_rx->head_seq_num + skipped) &
2378 } else while (tid_agg_rx->reorder_buf[index]) {
2379 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
2380 index = seq_sub(tid_agg_rx->head_seq_num,
2381 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2386 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2387 struct sk_buff *skb)
2389 struct ieee80211_hw *hw = &local->hw;
2390 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2391 struct sta_info *sta;
2392 struct tid_ampdu_rx *tid_agg_rx;
2398 sta = sta_info_get(local, hdr->addr2);
2402 /* filter the QoS data rx stream according to
2403 * STA/TID and check if this STA/TID is on aggregation */
2404 if (!ieee80211_is_data_qos(hdr->frame_control))
2407 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2409 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2412 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2414 /* qos null data frames are excluded */
2415 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2418 /* new un-ordered ampdu frame - process it */
2420 /* reset session timer */
2421 if (tid_agg_rx->timeout)
2422 mod_timer(&tid_agg_rx->session_timer,
2423 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2425 /* if this mpdu is fragmented - terminate rx aggregation session */
2426 sc = le16_to_cpu(hdr->seq_ctrl);
2427 if (sc & IEEE80211_SCTL_FRAG) {
2428 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2429 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2434 /* according to mpdu sequence number deal with reordering buffer */
2435 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2436 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2443 * This is the receive path handler. It is called by a low level driver when an
2444 * 802.11 MPDU is received from the hardware.
2446 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2448 struct ieee80211_local *local = hw_to_local(hw);
2449 struct ieee80211_rate *rate = NULL;
2450 struct ieee80211_supported_band *sband;
2451 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2453 WARN_ON_ONCE(softirq_count() == 0);
2455 if (WARN_ON(status->band < 0 ||
2456 status->band >= IEEE80211_NUM_BANDS))
2459 sband = local->hw.wiphy->bands[status->band];
2460 if (WARN_ON(!sband))
2464 * If we're suspending, it is possible although not too likely
2465 * that we'd be receiving frames after having already partially
2466 * quiesced the stack. We can't process such frames then since
2467 * that might, for example, cause stations to be added or other
2468 * driver callbacks be invoked.
2470 if (unlikely(local->quiescing || local->suspended))
2474 * The same happens when we're not even started,
2475 * but that's worth a warning.
2477 if (WARN_ON(!local->started))
2480 if (status->flag & RX_FLAG_HT) {
2481 /* rate_idx is MCS index */
2482 if (WARN_ON(status->rate_idx < 0 ||
2483 status->rate_idx >= 76))
2485 /* HT rates are not in the table - use the highest legacy rate
2486 * for now since other parts of mac80211 may not yet be fully
2488 rate = &sband->bitrates[sband->n_bitrates - 1];
2490 if (WARN_ON(status->rate_idx < 0 ||
2491 status->rate_idx >= sband->n_bitrates))
2493 rate = &sband->bitrates[status->rate_idx];
2497 * key references and virtual interfaces are protected using RCU
2498 * and this requires that we are in a read-side RCU section during
2499 * receive processing
2504 * Frames with failed FCS/PLCP checksum are not returned,
2505 * all other frames are returned without radiotap header
2506 * if it was previously present.
2507 * Also, frames with less than 16 bytes are dropped.
2509 skb = ieee80211_rx_monitor(local, skb, rate);
2516 * In theory, the block ack reordering should happen after duplicate
2517 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2518 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2519 * happen as a new RX handler between ieee80211_rx_h_check and
2520 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2521 * the time being, the call can be here since RX reorder buf processing
2522 * will implicitly skip duplicates. We could, in theory at least,
2523 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2524 * frames from other than operational channel), but that should not
2525 * happen in normal networks.
2527 if (!ieee80211_rx_reorder_ampdu(local, skb))
2528 __ieee80211_rx_handle_packet(hw, skb, rate);
2536 EXPORT_SYMBOL(ieee80211_rx);
2538 /* This is a version of the rx handler that can be called from hard irq
2539 * context. Post the skb on the queue and schedule the tasklet */
2540 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2542 struct ieee80211_local *local = hw_to_local(hw);
2544 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2546 skb->pkt_type = IEEE80211_RX_MSG;
2547 skb_queue_tail(&local->skb_queue, skb);
2548 tasklet_schedule(&local->tasklet);
2550 EXPORT_SYMBOL(ieee80211_rx_irqsafe);