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 */
98 /* make sure radiotap starts at a naturally aligned address */
100 len = roundup(len, 8);
106 * ieee80211_add_rx_radiotap_header - add radiotap header
108 * add a radiotap header containing all the fields which the hardware provided.
111 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
113 struct ieee80211_rate *rate,
116 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
117 struct ieee80211_radiotap_header *rthdr;
120 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
121 memset(rthdr, 0, rtap_len);
123 /* radiotap header, set always present flags */
125 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
126 (1 << IEEE80211_RADIOTAP_CHANNEL) |
127 (1 << IEEE80211_RADIOTAP_ANTENNA) |
128 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
129 rthdr->it_len = cpu_to_le16(rtap_len);
131 pos = (unsigned char *)(rthdr+1);
133 /* the order of the following fields is important */
135 /* IEEE80211_RADIOTAP_TSFT */
136 if (status->flag & RX_FLAG_TSFT) {
137 *(__le64 *)pos = cpu_to_le64(status->mactime);
139 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
143 /* IEEE80211_RADIOTAP_FLAGS */
144 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
145 *pos |= IEEE80211_RADIOTAP_F_FCS;
146 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
147 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
148 if (status->flag & RX_FLAG_SHORTPRE)
149 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
152 /* IEEE80211_RADIOTAP_RATE */
153 if (status->flag & RX_FLAG_HT) {
155 * TODO: add following information into radiotap header once
156 * suitable fields are defined for it:
157 * - MCS index (status->rate_idx)
158 * - HT40 (status->flag & RX_FLAG_40MHZ)
159 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
163 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
164 *pos = rate->bitrate / 5;
168 /* IEEE80211_RADIOTAP_CHANNEL */
169 *(__le16 *)pos = cpu_to_le16(status->freq);
171 if (status->band == IEEE80211_BAND_5GHZ)
172 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
173 IEEE80211_CHAN_5GHZ);
174 else if (rate->flags & IEEE80211_RATE_ERP_G)
175 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
176 IEEE80211_CHAN_2GHZ);
178 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
179 IEEE80211_CHAN_2GHZ);
182 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
183 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
184 *pos = status->signal;
186 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
190 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
191 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
192 *pos = status->noise;
194 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
198 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
200 /* IEEE80211_RADIOTAP_ANTENNA */
201 *pos = status->antenna;
204 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
206 /* IEEE80211_RADIOTAP_RX_FLAGS */
207 /* ensure 2 byte alignment for the 2 byte field as required */
208 if ((pos - (unsigned char *)rthdr) & 1)
210 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
211 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP);
216 * This function copies a received frame to all monitor interfaces and
217 * returns a cleaned-up SKB that no longer includes the FCS nor the
218 * radiotap header the driver might have added.
220 static struct sk_buff *
221 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
222 struct ieee80211_rate *rate)
224 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
225 struct ieee80211_sub_if_data *sdata;
226 int needed_headroom = 0;
227 struct sk_buff *skb, *skb2;
228 struct net_device *prev_dev = NULL;
229 int present_fcs_len = 0;
233 * First, we may need to make a copy of the skb because
234 * (1) we need to modify it for radiotap (if not present), and
235 * (2) the other RX handlers will modify the skb we got.
237 * We don't need to, of course, if we aren't going to return
238 * the SKB because it has a bad FCS/PLCP checksum.
240 if (status->flag & RX_FLAG_RADIOTAP)
241 rtap_len = ieee80211_get_radiotap_len(origskb->data);
243 /* room for the radiotap header based on driver features */
244 needed_headroom = ieee80211_rx_radiotap_len(local, status);
246 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
247 present_fcs_len = FCS_LEN;
249 if (!local->monitors) {
250 if (should_drop_frame(origskb, present_fcs_len, rtap_len)) {
251 dev_kfree_skb(origskb);
255 return remove_monitor_info(local, origskb, rtap_len);
258 if (should_drop_frame(origskb, present_fcs_len, rtap_len)) {
259 /* only need to expand headroom if necessary */
264 * This shouldn't trigger often because most devices have an
265 * RX header they pull before we get here, and that should
266 * be big enough for our radiotap information. We should
267 * probably export the length to drivers so that we can have
268 * them allocate enough headroom to start with.
270 if (skb_headroom(skb) < needed_headroom &&
271 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
277 * Need to make a copy and possibly remove radiotap header
278 * and FCS from the original.
280 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
282 origskb = remove_monitor_info(local, origskb, rtap_len);
288 /* if necessary, prepend radiotap information */
289 if (!(status->flag & RX_FLAG_RADIOTAP))
290 ieee80211_add_rx_radiotap_header(local, skb, rate,
293 skb_reset_mac_header(skb);
294 skb->ip_summed = CHECKSUM_UNNECESSARY;
295 skb->pkt_type = PACKET_OTHERHOST;
296 skb->protocol = htons(ETH_P_802_2);
298 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
299 if (!netif_running(sdata->dev))
302 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
305 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
309 skb2 = skb_clone(skb, GFP_ATOMIC);
311 skb2->dev = prev_dev;
316 prev_dev = sdata->dev;
317 sdata->dev->stats.rx_packets++;
318 sdata->dev->stats.rx_bytes += skb->len;
331 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
333 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
336 /* does the frame have a qos control field? */
337 if (ieee80211_is_data_qos(hdr->frame_control)) {
338 u8 *qc = ieee80211_get_qos_ctl(hdr);
339 /* frame has qos control */
340 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
341 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
342 rx->flags |= IEEE80211_RX_AMSDU;
344 rx->flags &= ~IEEE80211_RX_AMSDU;
347 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
349 * Sequence numbers for management frames, QoS data
350 * frames with a broadcast/multicast address in the
351 * Address 1 field, and all non-QoS data frames sent
352 * by QoS STAs are assigned using an additional single
353 * modulo-4096 counter, [...]
355 * We also use that counter for non-QoS STAs.
357 tid = NUM_RX_DATA_QUEUES - 1;
361 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
362 * For now, set skb->priority to 0 for other cases. */
363 rx->skb->priority = (tid > 7) ? 0 : tid;
367 * DOC: Packet alignment
369 * Drivers always need to pass packets that are aligned to two-byte boundaries
372 * Additionally, should, if possible, align the payload data in a way that
373 * guarantees that the contained IP header is aligned to a four-byte
374 * boundary. In the case of regular frames, this simply means aligning the
375 * payload to a four-byte boundary (because either the IP header is directly
376 * contained, or IV/RFC1042 headers that have a length divisible by four are
379 * With A-MSDU frames, however, the payload data address must yield two modulo
380 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
381 * push the IP header further back to a multiple of four again. Thankfully, the
382 * specs were sane enough this time around to require padding each A-MSDU
383 * subframe to a length that is a multiple of four.
385 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
386 * the payload is not supported, the driver is required to move the 802.11
387 * header to be directly in front of the payload in that case.
389 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
391 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
394 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
398 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
399 "unaligned packet at 0x%p\n", rx->skb->data))
402 if (!ieee80211_is_data_present(hdr->frame_control))
405 hdrlen = ieee80211_hdrlen(hdr->frame_control);
406 if (rx->flags & IEEE80211_RX_AMSDU)
408 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
409 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
415 static ieee80211_rx_result debug_noinline
416 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
418 struct ieee80211_local *local = rx->local;
419 struct sk_buff *skb = rx->skb;
421 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
422 return ieee80211_scan_rx(rx->sdata, skb);
424 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning))) {
425 /* drop all the other packets during a software scan anyway */
426 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
431 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
432 /* scanning finished during invoking of handlers */
433 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
434 return RX_DROP_UNUSABLE;
441 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
445 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
448 return ieee80211_is_robust_mgmt_frame(hdr);
452 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
454 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
456 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
459 return ieee80211_is_robust_mgmt_frame(hdr);
463 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
464 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
466 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
467 struct ieee80211_mmie *mmie;
469 if (skb->len < 24 + sizeof(*mmie) ||
470 !is_multicast_ether_addr(hdr->da))
473 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
474 return -1; /* not a robust management frame */
476 mmie = (struct ieee80211_mmie *)
477 (skb->data + skb->len - sizeof(*mmie));
478 if (mmie->element_id != WLAN_EID_MMIE ||
479 mmie->length != sizeof(*mmie) - 2)
482 return le16_to_cpu(mmie->key_id);
486 static ieee80211_rx_result
487 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
489 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
490 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
492 if (ieee80211_is_data(hdr->frame_control)) {
493 if (!ieee80211_has_a4(hdr->frame_control))
494 return RX_DROP_MONITOR;
495 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
496 return RX_DROP_MONITOR;
499 /* If there is not an established peer link and this is not a peer link
500 * establisment frame, beacon or probe, drop the frame.
503 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
504 struct ieee80211_mgmt *mgmt;
506 if (!ieee80211_is_mgmt(hdr->frame_control))
507 return RX_DROP_MONITOR;
509 if (ieee80211_is_action(hdr->frame_control)) {
510 mgmt = (struct ieee80211_mgmt *)hdr;
511 if (mgmt->u.action.category != PLINK_CATEGORY)
512 return RX_DROP_MONITOR;
516 if (ieee80211_is_probe_req(hdr->frame_control) ||
517 ieee80211_is_probe_resp(hdr->frame_control) ||
518 ieee80211_is_beacon(hdr->frame_control))
521 return RX_DROP_MONITOR;
525 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
527 if (ieee80211_is_data(hdr->frame_control) &&
528 is_multicast_ether_addr(hdr->addr1) &&
529 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
530 return RX_DROP_MONITOR;
537 static ieee80211_rx_result debug_noinline
538 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
540 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
542 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
543 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
544 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
545 rx->sta->last_seq_ctrl[rx->queue] ==
547 if (rx->flags & IEEE80211_RX_RA_MATCH) {
548 rx->local->dot11FrameDuplicateCount++;
549 rx->sta->num_duplicates++;
551 return RX_DROP_MONITOR;
553 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
556 if (unlikely(rx->skb->len < 16)) {
557 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
558 return RX_DROP_MONITOR;
561 /* Drop disallowed frame classes based on STA auth/assoc state;
562 * IEEE 802.11, Chap 5.5.
564 * mac80211 filters only based on association state, i.e. it drops
565 * Class 3 frames from not associated stations. hostapd sends
566 * deauth/disassoc frames when needed. In addition, hostapd is
567 * responsible for filtering on both auth and assoc states.
570 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
571 return ieee80211_rx_mesh_check(rx);
573 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
574 ieee80211_is_pspoll(hdr->frame_control)) &&
575 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
576 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
577 if ((!ieee80211_has_fromds(hdr->frame_control) &&
578 !ieee80211_has_tods(hdr->frame_control) &&
579 ieee80211_is_data(hdr->frame_control)) ||
580 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
581 /* Drop IBSS frames and frames for other hosts
583 return RX_DROP_MONITOR;
586 return RX_DROP_MONITOR;
593 static ieee80211_rx_result debug_noinline
594 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
599 ieee80211_rx_result result = RX_DROP_UNUSABLE;
600 struct ieee80211_key *stakey = NULL;
601 int mmie_keyidx = -1;
606 * There are four types of keys:
608 * - IGTK (group keys for management frames)
609 * - PTK (pairwise keys)
610 * - STK (station-to-station pairwise keys)
612 * When selecting a key, we have to distinguish between multicast
613 * (including broadcast) and unicast frames, the latter can only
614 * use PTKs and STKs while the former always use GTKs and IGTKs.
615 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
616 * unicast frames can also use key indices like GTKs. Hence, if we
617 * don't have a PTK/STK we check the key index for a WEP key.
619 * Note that in a regular BSS, multicast frames are sent by the
620 * AP only, associated stations unicast the frame to the AP first
621 * which then multicasts it on their behalf.
623 * There is also a slight problem in IBSS mode: GTKs are negotiated
624 * with each station, that is something we don't currently handle.
625 * The spec seems to expect that one negotiates the same key with
626 * every station but there's no such requirement; VLANs could be
631 * No point in finding a key and decrypting if the frame is neither
632 * addressed to us nor a multicast frame.
634 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
638 stakey = rcu_dereference(rx->sta->key);
640 if (!ieee80211_has_protected(hdr->frame_control))
641 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
643 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
645 /* Skip decryption if the frame is not protected. */
646 if (!ieee80211_has_protected(hdr->frame_control))
648 } else if (mmie_keyidx >= 0) {
649 /* Broadcast/multicast robust management frame / BIP */
650 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
651 (rx->status->flag & RX_FLAG_IV_STRIPPED))
654 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
655 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
656 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
657 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
658 } else if (!ieee80211_has_protected(hdr->frame_control)) {
660 * The frame was not protected, so skip decryption. However, we
661 * need to set rx->key if there is a key that could have been
662 * used so that the frame may be dropped if encryption would
663 * have been expected.
665 struct ieee80211_key *key = NULL;
666 if (ieee80211_is_mgmt(hdr->frame_control) &&
667 is_multicast_ether_addr(hdr->addr1) &&
668 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
670 else if ((key = rcu_dereference(rx->sdata->default_key)))
675 * The device doesn't give us the IV so we won't be
676 * able to look up the key. That's ok though, we
677 * don't need to decrypt the frame, we just won't
678 * be able to keep statistics accurate.
679 * Except for key threshold notifications, should
680 * we somehow allow the driver to tell us which key
681 * the hardware used if this flag is set?
683 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
684 (rx->status->flag & RX_FLAG_IV_STRIPPED))
687 hdrlen = ieee80211_hdrlen(hdr->frame_control);
689 if (rx->skb->len < 8 + hdrlen)
690 return RX_DROP_UNUSABLE; /* TODO: count this? */
693 * no need to call ieee80211_wep_get_keyidx,
694 * it verifies a bunch of things we've done already
696 keyidx = rx->skb->data[hdrlen + 3] >> 6;
698 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
701 * RSNA-protected unicast frames should always be sent with
702 * pairwise or station-to-station keys, but for WEP we allow
703 * using a key index as well.
705 if (rx->key && rx->key->conf.alg != ALG_WEP &&
706 !is_multicast_ether_addr(hdr->addr1))
711 rx->key->tx_rx_count++;
712 /* TODO: add threshold stuff again */
714 return RX_DROP_MONITOR;
717 /* Check for weak IVs if possible */
718 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
719 ieee80211_is_data(hdr->frame_control) &&
720 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
721 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
722 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
723 rx->sta->wep_weak_iv_count++;
725 switch (rx->key->conf.alg) {
727 result = ieee80211_crypto_wep_decrypt(rx);
730 result = ieee80211_crypto_tkip_decrypt(rx);
733 result = ieee80211_crypto_ccmp_decrypt(rx);
736 result = ieee80211_crypto_aes_cmac_decrypt(rx);
740 /* either the frame has been decrypted or will be dropped */
741 rx->status->flag |= RX_FLAG_DECRYPTED;
746 static ieee80211_rx_result debug_noinline
747 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
749 struct ieee80211_local *local;
750 struct ieee80211_hdr *hdr;
755 hdr = (struct ieee80211_hdr *) skb->data;
757 if (!local->pspolling)
760 if (!ieee80211_has_fromds(hdr->frame_control))
761 /* this is not from AP */
764 if (!ieee80211_is_data(hdr->frame_control))
767 if (!ieee80211_has_moredata(hdr->frame_control)) {
768 /* AP has no more frames buffered for us */
769 local->pspolling = false;
773 /* more data bit is set, let's request a new frame from the AP */
774 ieee80211_send_pspoll(local, rx->sdata);
779 static void ap_sta_ps_start(struct sta_info *sta)
781 struct ieee80211_sub_if_data *sdata = sta->sdata;
782 struct ieee80211_local *local = sdata->local;
784 atomic_inc(&sdata->bss->num_sta_ps);
785 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
786 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
787 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
788 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
789 sdata->dev->name, sta->sta.addr, sta->sta.aid);
790 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
793 static int ap_sta_ps_end(struct sta_info *sta)
795 struct ieee80211_sub_if_data *sdata = sta->sdata;
796 struct ieee80211_local *local = sdata->local;
799 atomic_dec(&sdata->bss->num_sta_ps);
801 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
802 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
804 if (!skb_queue_empty(&sta->ps_tx_buf))
805 sta_info_clear_tim_bit(sta);
807 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
808 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
809 sdata->dev->name, sta->sta.addr, sta->sta.aid);
810 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
812 /* Send all buffered frames to the station */
813 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
814 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
816 local->total_ps_buffered -= buffered;
818 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
819 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
820 "since STA not sleeping anymore\n", sdata->dev->name,
821 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
822 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
827 static ieee80211_rx_result debug_noinline
828 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
830 struct sta_info *sta = rx->sta;
831 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
837 * Update last_rx only for IBSS packets which are for the current
838 * BSSID to avoid keeping the current IBSS network alive in cases
839 * where other STAs start using different BSSID.
841 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
842 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
843 NL80211_IFTYPE_ADHOC);
844 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
845 sta->last_rx = jiffies;
846 } else if (!is_multicast_ether_addr(hdr->addr1)) {
848 * Mesh beacons will update last_rx when if they are found to
849 * match the current local configuration when processed.
851 sta->last_rx = jiffies;
854 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
857 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
858 ieee80211_sta_rx_notify(rx->sdata, hdr);
861 sta->rx_bytes += rx->skb->len;
862 sta->last_signal = rx->status->signal;
863 sta->last_qual = rx->status->qual;
864 sta->last_noise = rx->status->noise;
867 * Change STA power saving mode only at the end of a frame
870 if (!ieee80211_has_morefrags(hdr->frame_control) &&
871 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
872 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
873 if (test_sta_flags(sta, WLAN_STA_PS)) {
875 * Ignore doze->wake transitions that are
876 * indicated by non-data frames, the standard
877 * is unclear here, but for example going to
878 * PS mode and then scanning would cause a
879 * doze->wake transition for the probe request,
880 * and that is clearly undesirable.
882 if (ieee80211_is_data(hdr->frame_control) &&
883 !ieee80211_has_pm(hdr->frame_control))
884 rx->sent_ps_buffered += ap_sta_ps_end(sta);
886 if (ieee80211_has_pm(hdr->frame_control))
887 ap_sta_ps_start(sta);
891 /* Drop data::nullfunc frames silently, since they are used only to
892 * control station power saving mode. */
893 if (ieee80211_is_nullfunc(hdr->frame_control)) {
894 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
895 /* Update counter and free packet here to avoid counting this
896 * as a dropped packed. */
898 dev_kfree_skb(rx->skb);
903 } /* ieee80211_rx_h_sta_process */
905 static inline struct ieee80211_fragment_entry *
906 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
907 unsigned int frag, unsigned int seq, int rx_queue,
908 struct sk_buff **skb)
910 struct ieee80211_fragment_entry *entry;
913 idx = sdata->fragment_next;
914 entry = &sdata->fragments[sdata->fragment_next++];
915 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
916 sdata->fragment_next = 0;
918 if (!skb_queue_empty(&entry->skb_list)) {
919 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
920 struct ieee80211_hdr *hdr =
921 (struct ieee80211_hdr *) entry->skb_list.next->data;
922 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
923 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
924 "addr1=%pM addr2=%pM\n",
925 sdata->dev->name, idx,
926 jiffies - entry->first_frag_time, entry->seq,
927 entry->last_frag, hdr->addr1, hdr->addr2);
929 __skb_queue_purge(&entry->skb_list);
932 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
934 entry->first_frag_time = jiffies;
936 entry->rx_queue = rx_queue;
937 entry->last_frag = frag;
939 entry->extra_len = 0;
944 static inline struct ieee80211_fragment_entry *
945 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
946 unsigned int frag, unsigned int seq,
947 int rx_queue, struct ieee80211_hdr *hdr)
949 struct ieee80211_fragment_entry *entry;
952 idx = sdata->fragment_next;
953 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
954 struct ieee80211_hdr *f_hdr;
958 idx = IEEE80211_FRAGMENT_MAX - 1;
960 entry = &sdata->fragments[idx];
961 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
962 entry->rx_queue != rx_queue ||
963 entry->last_frag + 1 != frag)
966 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
969 * Check ftype and addresses are equal, else check next fragment
971 if (((hdr->frame_control ^ f_hdr->frame_control) &
972 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
973 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
974 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
977 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
978 __skb_queue_purge(&entry->skb_list);
987 static ieee80211_rx_result debug_noinline
988 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
990 struct ieee80211_hdr *hdr;
993 unsigned int frag, seq;
994 struct ieee80211_fragment_entry *entry;
997 hdr = (struct ieee80211_hdr *)rx->skb->data;
998 fc = hdr->frame_control;
999 sc = le16_to_cpu(hdr->seq_ctrl);
1000 frag = sc & IEEE80211_SCTL_FRAG;
1002 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1003 (rx->skb)->len < 24 ||
1004 is_multicast_ether_addr(hdr->addr1))) {
1005 /* not fragmented */
1008 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1010 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1013 /* This is the first fragment of a new frame. */
1014 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1015 rx->queue, &(rx->skb));
1016 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1017 ieee80211_has_protected(fc)) {
1018 /* Store CCMP PN so that we can verify that the next
1019 * fragment has a sequential PN value. */
1021 memcpy(entry->last_pn,
1022 rx->key->u.ccmp.rx_pn[rx->queue],
1028 /* This is a fragment for a frame that should already be pending in
1029 * fragment cache. Add this fragment to the end of the pending entry.
1031 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1033 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1034 return RX_DROP_MONITOR;
1037 /* Verify that MPDUs within one MSDU have sequential PN values.
1038 * (IEEE 802.11i, 8.3.3.4.5) */
1041 u8 pn[CCMP_PN_LEN], *rpn;
1042 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1043 return RX_DROP_UNUSABLE;
1044 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1045 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1050 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1051 if (memcmp(pn, rpn, CCMP_PN_LEN))
1052 return RX_DROP_UNUSABLE;
1053 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1056 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1057 __skb_queue_tail(&entry->skb_list, rx->skb);
1058 entry->last_frag = frag;
1059 entry->extra_len += rx->skb->len;
1060 if (ieee80211_has_morefrags(fc)) {
1065 rx->skb = __skb_dequeue(&entry->skb_list);
1066 if (skb_tailroom(rx->skb) < entry->extra_len) {
1067 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1068 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1070 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1071 __skb_queue_purge(&entry->skb_list);
1072 return RX_DROP_UNUSABLE;
1075 while ((skb = __skb_dequeue(&entry->skb_list))) {
1076 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1080 /* Complete frame has been reassembled - process it now */
1081 rx->flags |= IEEE80211_RX_FRAGMENTED;
1085 rx->sta->rx_packets++;
1086 if (is_multicast_ether_addr(hdr->addr1))
1087 rx->local->dot11MulticastReceivedFrameCount++;
1089 ieee80211_led_rx(rx->local);
1093 static ieee80211_rx_result debug_noinline
1094 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1096 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1097 struct sk_buff *skb;
1098 int no_pending_pkts;
1099 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1101 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1102 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1105 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1106 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1107 return RX_DROP_UNUSABLE;
1109 skb = skb_dequeue(&rx->sta->tx_filtered);
1111 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1113 rx->local->total_ps_buffered--;
1115 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1116 skb_queue_empty(&rx->sta->ps_tx_buf);
1119 struct ieee80211_hdr *hdr =
1120 (struct ieee80211_hdr *) skb->data;
1123 * Tell TX path to send one frame even though the STA may
1124 * still remain is PS mode after this frame exchange.
1126 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1128 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1129 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1130 rx->sta->sta.addr, rx->sta->sta.aid,
1131 skb_queue_len(&rx->sta->ps_tx_buf));
1132 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1134 /* Use MoreData flag to indicate whether there are more
1135 * buffered frames for this STA */
1136 if (no_pending_pkts)
1137 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1139 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1141 dev_queue_xmit(skb);
1143 if (no_pending_pkts)
1144 sta_info_clear_tim_bit(rx->sta);
1145 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1146 } else if (!rx->sent_ps_buffered) {
1148 * FIXME: This can be the result of a race condition between
1149 * us expiring a frame and the station polling for it.
1150 * Should we send it a null-func frame indicating we
1151 * have nothing buffered for it?
1153 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1154 "though there are no buffered frames for it\n",
1155 rx->dev->name, rx->sta->sta.addr);
1156 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1159 /* Free PS Poll skb here instead of returning RX_DROP that would
1160 * count as an dropped frame. */
1161 dev_kfree_skb(rx->skb);
1166 static ieee80211_rx_result debug_noinline
1167 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1169 u8 *data = rx->skb->data;
1170 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1172 if (!ieee80211_is_data_qos(hdr->frame_control))
1175 /* remove the qos control field, update frame type and meta-data */
1176 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1177 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1178 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1179 /* change frame type to non QOS */
1180 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1186 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1188 if (unlikely(!rx->sta ||
1189 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1196 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1199 * Pass through unencrypted frames if the hardware has
1200 * decrypted them already.
1202 if (rx->status->flag & RX_FLAG_DECRYPTED)
1205 /* Drop unencrypted frames if key is set. */
1206 if (unlikely(!ieee80211_has_protected(fc) &&
1207 !ieee80211_is_nullfunc(fc) &&
1208 ieee80211_is_data(fc) &&
1209 (rx->key || rx->sdata->drop_unencrypted)))
1211 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1212 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1215 /* BIP does not use Protected field, so need to check MMIE */
1216 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1217 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1221 * When using MFP, Action frames are not allowed prior to
1222 * having configured keys.
1224 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1225 ieee80211_is_robust_mgmt_frame(
1226 (struct ieee80211_hdr *) rx->skb->data)))
1234 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1236 struct net_device *dev = rx->dev;
1237 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1239 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
1243 * requires that rx->skb is a frame with ethernet header
1245 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1247 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1248 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1249 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1252 * Allow EAPOL frames to us/the PAE group address regardless
1253 * of whether the frame was encrypted or not.
1255 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1256 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1257 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1260 if (ieee80211_802_1x_port_control(rx) ||
1261 ieee80211_drop_unencrypted(rx, fc))
1268 * requires that rx->skb is a frame with ethernet header
1271 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1273 struct net_device *dev = rx->dev;
1274 struct ieee80211_local *local = rx->local;
1275 struct sk_buff *skb, *xmit_skb;
1276 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1277 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1278 struct sta_info *dsta;
1283 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1284 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1285 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1286 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1287 if (is_multicast_ether_addr(ehdr->h_dest)) {
1289 * send multicast frames both to higher layers in
1290 * local net stack and back to the wireless medium
1292 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1293 if (!xmit_skb && net_ratelimit())
1294 printk(KERN_DEBUG "%s: failed to clone "
1295 "multicast frame\n", dev->name);
1297 dsta = sta_info_get(local, skb->data);
1298 if (dsta && dsta->sdata->dev == dev) {
1300 * The destination station is associated to
1301 * this AP (in this VLAN), so send the frame
1302 * directly to it and do not pass it to local
1312 int align __maybe_unused;
1314 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1316 * 'align' will only take the values 0 or 2 here
1317 * since all frames are required to be aligned
1318 * to 2-byte boundaries when being passed to
1319 * mac80211. That also explains the __skb_push()
1322 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1324 if (WARN_ON(skb_headroom(skb) < 3)) {
1328 u8 *data = skb->data;
1329 size_t len = skb->len;
1330 u8 *new = __skb_push(skb, align);
1331 memmove(new, data, len);
1332 __skb_trim(skb, len);
1338 /* deliver to local stack */
1339 skb->protocol = eth_type_trans(skb, dev);
1340 memset(skb->cb, 0, sizeof(skb->cb));
1346 /* send to wireless media */
1347 xmit_skb->protocol = htons(ETH_P_802_3);
1348 skb_reset_network_header(xmit_skb);
1349 skb_reset_mac_header(xmit_skb);
1350 dev_queue_xmit(xmit_skb);
1354 static ieee80211_rx_result debug_noinline
1355 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1357 struct net_device *dev = rx->dev;
1358 struct ieee80211_local *local = rx->local;
1361 struct sk_buff *skb = rx->skb, *frame = NULL;
1362 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1363 __le16 fc = hdr->frame_control;
1364 const struct ethhdr *eth;
1369 if (unlikely(!ieee80211_is_data(fc)))
1372 if (unlikely(!ieee80211_is_data_present(fc)))
1373 return RX_DROP_MONITOR;
1375 if (!(rx->flags & IEEE80211_RX_AMSDU))
1378 err = __ieee80211_data_to_8023(rx);
1380 return RX_DROP_UNUSABLE;
1384 dev->stats.rx_packets++;
1385 dev->stats.rx_bytes += skb->len;
1387 /* skip the wrapping header */
1388 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1390 return RX_DROP_UNUSABLE;
1392 while (skb != frame) {
1394 __be16 len = eth->h_proto;
1395 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1397 remaining = skb->len;
1398 memcpy(dst, eth->h_dest, ETH_ALEN);
1399 memcpy(src, eth->h_source, ETH_ALEN);
1401 padding = ((4 - subframe_len) & 0x3);
1402 /* the last MSDU has no padding */
1403 if (subframe_len > remaining)
1404 return RX_DROP_UNUSABLE;
1406 skb_pull(skb, sizeof(struct ethhdr));
1407 /* if last subframe reuse skb */
1408 if (remaining <= subframe_len + padding)
1412 * Allocate and reserve two bytes more for payload
1413 * alignment since sizeof(struct ethhdr) is 14.
1415 frame = dev_alloc_skb(
1416 ALIGN(local->hw.extra_tx_headroom, 4) +
1420 return RX_DROP_UNUSABLE;
1423 ALIGN(local->hw.extra_tx_headroom, 4) +
1424 sizeof(struct ethhdr) + 2);
1425 memcpy(skb_put(frame, ntohs(len)), skb->data,
1428 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1431 dev_kfree_skb(frame);
1432 return RX_DROP_UNUSABLE;
1436 skb_reset_network_header(frame);
1438 frame->priority = skb->priority;
1441 payload = frame->data;
1442 ethertype = (payload[6] << 8) | payload[7];
1444 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1445 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1446 compare_ether_addr(payload,
1447 bridge_tunnel_header) == 0)) {
1448 /* remove RFC1042 or Bridge-Tunnel
1449 * encapsulation and replace EtherType */
1451 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1452 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1454 memcpy(skb_push(frame, sizeof(__be16)),
1455 &len, sizeof(__be16));
1456 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1457 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1460 if (!ieee80211_frame_allowed(rx, fc)) {
1461 if (skb == frame) /* last frame */
1462 return RX_DROP_UNUSABLE;
1463 dev_kfree_skb(frame);
1467 ieee80211_deliver_skb(rx);
1473 #ifdef CONFIG_MAC80211_MESH
1474 static ieee80211_rx_result
1475 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1477 struct ieee80211_hdr *hdr;
1478 struct ieee80211s_hdr *mesh_hdr;
1479 unsigned int hdrlen;
1480 struct sk_buff *skb = rx->skb, *fwd_skb;
1481 struct ieee80211_local *local = rx->local;
1482 struct ieee80211_sub_if_data *sdata;
1484 hdr = (struct ieee80211_hdr *) skb->data;
1485 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1486 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1487 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1489 if (!ieee80211_is_data(hdr->frame_control))
1494 return RX_DROP_MONITOR;
1496 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1497 struct mesh_path *mppath;
1500 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1502 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1504 spin_lock_bh(&mppath->state_lock);
1505 mppath->exp_time = jiffies;
1506 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1507 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1508 spin_unlock_bh(&mppath->state_lock);
1513 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1518 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1520 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1521 dropped_frames_ttl);
1523 struct ieee80211_hdr *fwd_hdr;
1524 struct ieee80211_tx_info *info;
1526 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1528 if (!fwd_skb && net_ratelimit())
1529 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1532 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1534 * Save TA to addr1 to send TA a path error if a
1535 * suitable next hop is not found
1537 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1538 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1539 info = IEEE80211_SKB_CB(fwd_skb);
1540 memset(info, 0, sizeof(*info));
1541 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1542 info->control.vif = &rx->sdata->vif;
1543 ieee80211_select_queue(local, fwd_skb);
1544 if (is_multicast_ether_addr(fwd_hdr->addr3))
1545 memcpy(fwd_hdr->addr1, fwd_hdr->addr3,
1548 int err = mesh_nexthop_lookup(fwd_skb, sdata);
1549 /* Failed to immediately resolve next hop:
1550 * fwded frame was dropped or will be added
1551 * later to the pending skb queue. */
1553 return RX_DROP_MONITOR;
1555 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1557 ieee80211_add_pending_skb(local, fwd_skb);
1561 if (is_multicast_ether_addr(hdr->addr3) ||
1562 rx->dev->flags & IFF_PROMISC)
1565 return RX_DROP_MONITOR;
1569 static ieee80211_rx_result debug_noinline
1570 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1572 struct net_device *dev = rx->dev;
1573 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1574 __le16 fc = hdr->frame_control;
1577 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1580 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1581 return RX_DROP_MONITOR;
1583 err = __ieee80211_data_to_8023(rx);
1585 return RX_DROP_UNUSABLE;
1587 if (!ieee80211_frame_allowed(rx, fc))
1588 return RX_DROP_MONITOR;
1592 dev->stats.rx_packets++;
1593 dev->stats.rx_bytes += rx->skb->len;
1595 ieee80211_deliver_skb(rx);
1600 static ieee80211_rx_result debug_noinline
1601 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1603 struct ieee80211_local *local = rx->local;
1604 struct ieee80211_hw *hw = &local->hw;
1605 struct sk_buff *skb = rx->skb;
1606 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1607 struct tid_ampdu_rx *tid_agg_rx;
1611 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1614 if (ieee80211_is_back_req(bar->frame_control)) {
1617 tid = le16_to_cpu(bar->control) >> 12;
1618 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1619 != HT_AGG_STATE_OPERATIONAL)
1621 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1623 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1625 /* reset session timer */
1626 if (tid_agg_rx->timeout)
1627 mod_timer(&tid_agg_rx->session_timer,
1628 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1630 /* manage reordering buffer according to requested */
1631 /* sequence number */
1633 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1636 return RX_DROP_UNUSABLE;
1642 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1643 struct ieee80211_mgmt *mgmt,
1646 struct ieee80211_local *local = sdata->local;
1647 struct sk_buff *skb;
1648 struct ieee80211_mgmt *resp;
1650 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1651 /* Not to own unicast address */
1655 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1656 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1657 /* Not from the current AP or not associated yet. */
1661 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1662 /* Too short SA Query request frame */
1666 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1670 skb_reserve(skb, local->hw.extra_tx_headroom);
1671 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1672 memset(resp, 0, 24);
1673 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1674 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1675 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1676 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1677 IEEE80211_STYPE_ACTION);
1678 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1679 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1680 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1681 memcpy(resp->u.action.u.sa_query.trans_id,
1682 mgmt->u.action.u.sa_query.trans_id,
1683 WLAN_SA_QUERY_TR_ID_LEN);
1685 ieee80211_tx_skb(sdata, skb, 1);
1688 static ieee80211_rx_result debug_noinline
1689 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1691 struct ieee80211_local *local = rx->local;
1692 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1693 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1694 int len = rx->skb->len;
1696 if (!ieee80211_is_action(mgmt->frame_control))
1700 return RX_DROP_MONITOR;
1702 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1703 return RX_DROP_MONITOR;
1705 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1706 return RX_DROP_MONITOR;
1708 /* all categories we currently handle have action_code */
1709 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1710 return RX_DROP_MONITOR;
1712 switch (mgmt->u.action.category) {
1713 case WLAN_CATEGORY_BACK:
1715 * The aggregation code is not prepared to handle
1716 * anything but STA/AP due to the BSSID handling;
1717 * IBSS could work in the code but isn't supported
1718 * by drivers or the standard.
1720 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1721 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1722 sdata->vif.type != NL80211_IFTYPE_AP)
1723 return RX_DROP_MONITOR;
1725 switch (mgmt->u.action.u.addba_req.action_code) {
1726 case WLAN_ACTION_ADDBA_REQ:
1727 if (len < (IEEE80211_MIN_ACTION_SIZE +
1728 sizeof(mgmt->u.action.u.addba_req)))
1729 return RX_DROP_MONITOR;
1730 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1732 case WLAN_ACTION_ADDBA_RESP:
1733 if (len < (IEEE80211_MIN_ACTION_SIZE +
1734 sizeof(mgmt->u.action.u.addba_resp)))
1735 return RX_DROP_MONITOR;
1736 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1738 case WLAN_ACTION_DELBA:
1739 if (len < (IEEE80211_MIN_ACTION_SIZE +
1740 sizeof(mgmt->u.action.u.delba)))
1741 return RX_DROP_MONITOR;
1742 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1746 case WLAN_CATEGORY_SPECTRUM_MGMT:
1747 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1748 return RX_DROP_MONITOR;
1750 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1751 return RX_DROP_MONITOR;
1753 switch (mgmt->u.action.u.measurement.action_code) {
1754 case WLAN_ACTION_SPCT_MSR_REQ:
1755 if (len < (IEEE80211_MIN_ACTION_SIZE +
1756 sizeof(mgmt->u.action.u.measurement)))
1757 return RX_DROP_MONITOR;
1758 ieee80211_process_measurement_req(sdata, mgmt, len);
1760 case WLAN_ACTION_SPCT_CHL_SWITCH:
1761 if (len < (IEEE80211_MIN_ACTION_SIZE +
1762 sizeof(mgmt->u.action.u.chan_switch)))
1763 return RX_DROP_MONITOR;
1765 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1766 return RX_DROP_MONITOR;
1768 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1769 return RX_DROP_MONITOR;
1771 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1774 case WLAN_CATEGORY_SA_QUERY:
1775 if (len < (IEEE80211_MIN_ACTION_SIZE +
1776 sizeof(mgmt->u.action.u.sa_query)))
1777 return RX_DROP_MONITOR;
1778 switch (mgmt->u.action.u.sa_query.action) {
1779 case WLAN_ACTION_SA_QUERY_REQUEST:
1780 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1781 return RX_DROP_MONITOR;
1782 ieee80211_process_sa_query_req(sdata, mgmt, len);
1784 case WLAN_ACTION_SA_QUERY_RESPONSE:
1786 * SA Query response is currently only used in AP mode
1787 * and it is processed in user space.
1796 rx->sta->rx_packets++;
1797 dev_kfree_skb(rx->skb);
1801 static ieee80211_rx_result debug_noinline
1802 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1804 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1805 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1807 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1808 return RX_DROP_MONITOR;
1810 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1811 return RX_DROP_MONITOR;
1813 if (ieee80211_vif_is_mesh(&sdata->vif))
1814 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
1816 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
1817 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
1819 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1820 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1822 return RX_DROP_MONITOR;
1825 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
1826 struct ieee80211_rx_data *rx)
1829 unsigned int hdrlen;
1831 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1832 if (rx->skb->len >= hdrlen + 4)
1833 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1839 * Some hardware seem to generate incorrect Michael MIC
1840 * reports; ignore them to avoid triggering countermeasures.
1845 if (!ieee80211_has_protected(hdr->frame_control))
1848 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1850 * APs with pairwise keys should never receive Michael MIC
1851 * errors for non-zero keyidx because these are reserved for
1852 * group keys and only the AP is sending real multicast
1853 * frames in the BSS.
1858 if (!ieee80211_is_data(hdr->frame_control) &&
1859 !ieee80211_is_auth(hdr->frame_control))
1862 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1865 dev_kfree_skb(rx->skb);
1869 /* TODO: use IEEE80211_RX_FRAGMENTED */
1870 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1872 struct ieee80211_sub_if_data *sdata;
1873 struct ieee80211_local *local = rx->local;
1874 struct ieee80211_rtap_hdr {
1875 struct ieee80211_radiotap_header hdr;
1880 } __attribute__ ((packed)) *rthdr;
1881 struct sk_buff *skb = rx->skb, *skb2;
1882 struct net_device *prev_dev = NULL;
1883 struct ieee80211_rx_status *status = rx->status;
1885 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1888 if (skb_headroom(skb) < sizeof(*rthdr) &&
1889 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1892 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1893 memset(rthdr, 0, sizeof(*rthdr));
1894 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1895 rthdr->hdr.it_present =
1896 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1897 (1 << IEEE80211_RADIOTAP_RATE) |
1898 (1 << IEEE80211_RADIOTAP_CHANNEL));
1900 rthdr->rate = rx->rate->bitrate / 5;
1901 rthdr->chan_freq = cpu_to_le16(status->freq);
1903 if (status->band == IEEE80211_BAND_5GHZ)
1904 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1905 IEEE80211_CHAN_5GHZ);
1907 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1908 IEEE80211_CHAN_2GHZ);
1910 skb_set_mac_header(skb, 0);
1911 skb->ip_summed = CHECKSUM_UNNECESSARY;
1912 skb->pkt_type = PACKET_OTHERHOST;
1913 skb->protocol = htons(ETH_P_802_2);
1915 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1916 if (!netif_running(sdata->dev))
1919 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1920 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1924 skb2 = skb_clone(skb, GFP_ATOMIC);
1926 skb2->dev = prev_dev;
1931 prev_dev = sdata->dev;
1932 sdata->dev->stats.rx_packets++;
1933 sdata->dev->stats.rx_bytes += skb->len;
1937 skb->dev = prev_dev;
1943 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1951 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1952 struct ieee80211_rx_data *rx,
1953 struct sk_buff *skb)
1955 ieee80211_rx_result res = RX_DROP_MONITOR;
1959 rx->dev = sdata->dev;
1961 #define CALL_RXH(rxh) \
1964 if (res != RX_CONTINUE) \
1968 CALL_RXH(ieee80211_rx_h_passive_scan)
1969 CALL_RXH(ieee80211_rx_h_check)
1970 CALL_RXH(ieee80211_rx_h_decrypt)
1971 CALL_RXH(ieee80211_rx_h_check_more_data)
1972 CALL_RXH(ieee80211_rx_h_sta_process)
1973 CALL_RXH(ieee80211_rx_h_defragment)
1974 CALL_RXH(ieee80211_rx_h_ps_poll)
1975 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1976 /* must be after MMIC verify so header is counted in MPDU mic */
1977 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1978 CALL_RXH(ieee80211_rx_h_amsdu)
1979 #ifdef CONFIG_MAC80211_MESH
1980 if (ieee80211_vif_is_mesh(&sdata->vif))
1981 CALL_RXH(ieee80211_rx_h_mesh_fwding);
1983 CALL_RXH(ieee80211_rx_h_data)
1984 CALL_RXH(ieee80211_rx_h_ctrl)
1985 CALL_RXH(ieee80211_rx_h_action)
1986 CALL_RXH(ieee80211_rx_h_mgmt)
1992 case RX_DROP_MONITOR:
1993 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1995 rx->sta->rx_dropped++;
1998 ieee80211_rx_cooked_monitor(rx);
2000 case RX_DROP_UNUSABLE:
2001 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2003 rx->sta->rx_dropped++;
2004 dev_kfree_skb(rx->skb);
2007 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2012 /* main receive path */
2014 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2015 struct ieee80211_rx_data *rx,
2016 struct ieee80211_hdr *hdr)
2018 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
2019 int multicast = is_multicast_ether_addr(hdr->addr1);
2021 switch (sdata->vif.type) {
2022 case NL80211_IFTYPE_STATION:
2026 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
2027 if (!(sdata->dev->flags & IFF_PROMISC))
2029 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2032 case NL80211_IFTYPE_ADHOC:
2035 if (ieee80211_is_beacon(hdr->frame_control)) {
2038 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2039 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2041 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2042 } else if (!multicast &&
2043 compare_ether_addr(sdata->dev->dev_addr,
2045 if (!(sdata->dev->flags & IFF_PROMISC))
2047 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2048 } else if (!rx->sta) {
2050 if (rx->status->flag & RX_FLAG_HT)
2051 rate_idx = 0; /* TODO: HT rates */
2053 rate_idx = rx->status->rate_idx;
2054 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2058 case NL80211_IFTYPE_MESH_POINT:
2060 compare_ether_addr(sdata->dev->dev_addr,
2062 if (!(sdata->dev->flags & IFF_PROMISC))
2065 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2068 case NL80211_IFTYPE_AP_VLAN:
2069 case NL80211_IFTYPE_AP:
2071 if (compare_ether_addr(sdata->dev->dev_addr,
2074 } else if (!ieee80211_bssid_match(bssid,
2075 sdata->dev->dev_addr)) {
2076 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2078 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2081 case NL80211_IFTYPE_WDS:
2082 if (bssid || !ieee80211_is_data(hdr->frame_control))
2084 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2087 case NL80211_IFTYPE_MONITOR:
2088 /* take everything */
2090 case NL80211_IFTYPE_UNSPECIFIED:
2091 case __NL80211_IFTYPE_AFTER_LAST:
2092 /* should never get here */
2101 * This is the actual Rx frames handler. as it blongs to Rx path it must
2102 * be called with rcu_read_lock protection.
2104 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2105 struct sk_buff *skb,
2106 struct ieee80211_rate *rate)
2108 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2109 struct ieee80211_local *local = hw_to_local(hw);
2110 struct ieee80211_sub_if_data *sdata;
2111 struct ieee80211_hdr *hdr;
2112 struct ieee80211_rx_data rx;
2114 struct ieee80211_sub_if_data *prev = NULL;
2115 struct sk_buff *skb_new;
2117 hdr = (struct ieee80211_hdr *)skb->data;
2118 memset(&rx, 0, sizeof(rx));
2125 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2126 local->dot11ReceivedFragmentCount++;
2128 rx.sta = sta_info_get(local, hdr->addr2);
2130 rx.sdata = rx.sta->sdata;
2131 rx.dev = rx.sta->sdata->dev;
2134 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
2135 ieee80211_rx_michael_mic_report(hdr, &rx);
2139 if (unlikely(local->scanning))
2140 rx.flags |= IEEE80211_RX_IN_SCAN;
2142 ieee80211_parse_qos(&rx);
2143 ieee80211_verify_alignment(&rx);
2147 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2148 if (!netif_running(sdata->dev))
2151 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2154 rx.flags |= IEEE80211_RX_RA_MATCH;
2155 prepares = prepare_for_handlers(sdata, &rx, hdr);
2161 * frame is destined for this interface, but if it's not
2162 * also for the previous one we handle that after the
2163 * loop to avoid copying the SKB once too much
2172 * frame was destined for the previous interface
2173 * so invoke RX handlers for it
2176 skb_new = skb_copy(skb, GFP_ATOMIC);
2178 if (net_ratelimit())
2179 printk(KERN_DEBUG "%s: failed to copy "
2180 "multicast frame for %s\n",
2181 wiphy_name(local->hw.wiphy),
2185 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2189 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2194 #define SEQ_MODULO 0x1000
2195 #define SEQ_MASK 0xfff
2197 static inline int seq_less(u16 sq1, u16 sq2)
2199 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2202 static inline u16 seq_inc(u16 sq)
2204 return (sq + 1) & SEQ_MASK;
2207 static inline u16 seq_sub(u16 sq1, u16 sq2)
2209 return (sq1 - sq2) & SEQ_MASK;
2213 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2214 struct tid_ampdu_rx *tid_agg_rx,
2217 struct ieee80211_supported_band *sband;
2218 struct ieee80211_rate *rate;
2219 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2220 struct ieee80211_rx_status *status;
2225 status = IEEE80211_SKB_RXCB(skb);
2227 /* release the reordered frames to stack */
2228 sband = hw->wiphy->bands[status->band];
2229 if (status->flag & RX_FLAG_HT)
2230 rate = sband->bitrates; /* TODO: HT rates */
2232 rate = &sband->bitrates[status->rate_idx];
2233 __ieee80211_rx_handle_packet(hw, skb, rate);
2234 tid_agg_rx->stored_mpdu_num--;
2235 tid_agg_rx->reorder_buf[index] = NULL;
2238 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2243 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2244 * the skb was added to the buffer longer than this time ago, the earlier
2245 * frames that have not yet been received are assumed to be lost and the skb
2246 * can be released for processing. This may also release other skb's from the
2247 * reorder buffer if there are no additional gaps between the frames.
2249 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2252 * As it function blongs to Rx path it must be called with
2253 * the proper rcu_read_lock protection for its flow.
2255 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2256 struct tid_ampdu_rx *tid_agg_rx,
2257 struct sk_buff *skb,
2261 u16 head_seq_num, buf_size;
2264 buf_size = tid_agg_rx->buf_size;
2265 head_seq_num = tid_agg_rx->head_seq_num;
2267 /* frame with out of date sequence number */
2268 if (seq_less(mpdu_seq_num, head_seq_num)) {
2273 /* if frame sequence number exceeds our buffering window size or
2274 * block Ack Request arrived - release stored frames */
2275 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2276 /* new head to the ordering buffer */
2278 head_seq_num = mpdu_seq_num;
2281 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2282 /* release stored frames up to new head to stack */
2283 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2284 index = seq_sub(tid_agg_rx->head_seq_num,
2286 % tid_agg_rx->buf_size;
2287 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2294 /* now the new frame is always in the range of the reordering */
2296 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2297 % tid_agg_rx->buf_size;
2298 /* check if we already stored this frame */
2299 if (tid_agg_rx->reorder_buf[index]) {
2304 /* if arrived mpdu is in the right order and nothing else stored */
2305 /* release it immediately */
2306 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2307 tid_agg_rx->stored_mpdu_num == 0) {
2308 tid_agg_rx->head_seq_num =
2309 seq_inc(tid_agg_rx->head_seq_num);
2313 /* put the frame in the reordering buffer */
2314 tid_agg_rx->reorder_buf[index] = skb;
2315 tid_agg_rx->reorder_time[index] = jiffies;
2316 tid_agg_rx->stored_mpdu_num++;
2317 /* release the buffer until next missing frame */
2318 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2319 % tid_agg_rx->buf_size;
2320 if (!tid_agg_rx->reorder_buf[index] &&
2321 tid_agg_rx->stored_mpdu_num > 1) {
2323 * No buffers ready to be released, but check whether any
2324 * frames in the reorder buffer have timed out.
2328 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2329 j = (j + 1) % tid_agg_rx->buf_size) {
2330 if (tid_agg_rx->reorder_buf[j] == NULL) {
2334 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2338 #ifdef CONFIG_MAC80211_HT_DEBUG
2339 if (net_ratelimit())
2340 printk(KERN_DEBUG "%s: release an RX reorder "
2341 "frame due to timeout on earlier "
2343 wiphy_name(hw->wiphy));
2345 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2348 * Increment the head seq# also for the skipped slots.
2350 tid_agg_rx->head_seq_num =
2351 (tid_agg_rx->head_seq_num + skipped) &
2355 } else while (tid_agg_rx->reorder_buf[index]) {
2356 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
2357 index = seq_sub(tid_agg_rx->head_seq_num,
2358 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2363 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2364 struct sk_buff *skb)
2366 struct ieee80211_hw *hw = &local->hw;
2367 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2368 struct sta_info *sta;
2369 struct tid_ampdu_rx *tid_agg_rx;
2375 sta = sta_info_get(local, hdr->addr2);
2379 /* filter the QoS data rx stream according to
2380 * STA/TID and check if this STA/TID is on aggregation */
2381 if (!ieee80211_is_data_qos(hdr->frame_control))
2384 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2386 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2389 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2391 /* qos null data frames are excluded */
2392 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2395 /* new un-ordered ampdu frame - process it */
2397 /* reset session timer */
2398 if (tid_agg_rx->timeout)
2399 mod_timer(&tid_agg_rx->session_timer,
2400 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2402 /* if this mpdu is fragmented - terminate rx aggregation session */
2403 sc = le16_to_cpu(hdr->seq_ctrl);
2404 if (sc & IEEE80211_SCTL_FRAG) {
2405 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2406 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2411 /* according to mpdu sequence number deal with reordering buffer */
2412 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2413 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2420 * This is the receive path handler. It is called by a low level driver when an
2421 * 802.11 MPDU is received from the hardware.
2423 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2425 struct ieee80211_local *local = hw_to_local(hw);
2426 struct ieee80211_rate *rate = NULL;
2427 struct ieee80211_supported_band *sband;
2428 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2430 if (status->band < 0 ||
2431 status->band >= IEEE80211_NUM_BANDS) {
2436 sband = local->hw.wiphy->bands[status->band];
2442 if (status->flag & RX_FLAG_HT) {
2443 /* rate_idx is MCS index */
2444 if (WARN_ON(status->rate_idx < 0 ||
2445 status->rate_idx >= 76))
2447 /* HT rates are not in the table - use the highest legacy rate
2448 * for now since other parts of mac80211 may not yet be fully
2450 rate = &sband->bitrates[sband->n_bitrates - 1];
2452 if (WARN_ON(status->rate_idx < 0 ||
2453 status->rate_idx >= sband->n_bitrates))
2455 rate = &sband->bitrates[status->rate_idx];
2459 * key references and virtual interfaces are protected using RCU
2460 * and this requires that we are in a read-side RCU section during
2461 * receive processing
2466 * Frames with failed FCS/PLCP checksum are not returned,
2467 * all other frames are returned without radiotap header
2468 * if it was previously present.
2469 * Also, frames with less than 16 bytes are dropped.
2471 skb = ieee80211_rx_monitor(local, skb, rate);
2478 * In theory, the block ack reordering should happen after duplicate
2479 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2480 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2481 * happen as a new RX handler between ieee80211_rx_h_check and
2482 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2483 * the time being, the call can be here since RX reorder buf processing
2484 * will implicitly skip duplicates. We could, in theory at least,
2485 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2486 * frames from other than operational channel), but that should not
2487 * happen in normal networks.
2489 if (!ieee80211_rx_reorder_ampdu(local, skb))
2490 __ieee80211_rx_handle_packet(hw, skb, rate);
2494 EXPORT_SYMBOL(__ieee80211_rx);
2496 /* This is a version of the rx handler that can be called from hard irq
2497 * context. Post the skb on the queue and schedule the tasklet */
2498 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2500 struct ieee80211_local *local = hw_to_local(hw);
2502 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2504 skb->pkt_type = IEEE80211_RX_MSG;
2505 skb_queue_tail(&local->skb_queue, skb);
2506 tasklet_schedule(&local->tasklet);
2508 EXPORT_SYMBOL(ieee80211_rx_irqsafe);