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 void 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 */
824 static ieee80211_rx_result debug_noinline
825 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
827 struct sta_info *sta = rx->sta;
828 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
834 * Update last_rx only for IBSS packets which are for the current
835 * BSSID to avoid keeping the current IBSS network alive in cases
836 * where other STAs start using different BSSID.
838 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
839 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
840 NL80211_IFTYPE_ADHOC);
841 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
842 sta->last_rx = jiffies;
843 } else if (!is_multicast_ether_addr(hdr->addr1)) {
845 * Mesh beacons will update last_rx when if they are found to
846 * match the current local configuration when processed.
848 sta->last_rx = jiffies;
851 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
854 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
855 ieee80211_sta_rx_notify(rx->sdata, hdr);
858 sta->rx_bytes += rx->skb->len;
859 sta->last_signal = rx->status->signal;
860 sta->last_noise = rx->status->noise;
863 * Change STA power saving mode only at the end of a frame
866 if (!ieee80211_has_morefrags(hdr->frame_control) &&
867 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
868 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
869 if (test_sta_flags(sta, WLAN_STA_PS)) {
871 * Ignore doze->wake transitions that are
872 * indicated by non-data frames, the standard
873 * is unclear here, but for example going to
874 * PS mode and then scanning would cause a
875 * doze->wake transition for the probe request,
876 * and that is clearly undesirable.
878 if (ieee80211_is_data(hdr->frame_control) &&
879 !ieee80211_has_pm(hdr->frame_control))
882 if (ieee80211_has_pm(hdr->frame_control))
883 ap_sta_ps_start(sta);
888 * Drop (qos-)data::nullfunc frames silently, since they
889 * are used only to control station power saving mode.
891 if (ieee80211_is_nullfunc(hdr->frame_control) ||
892 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
893 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
895 * Update counter and free packet here to avoid
896 * counting this as a dropped packed.
899 dev_kfree_skb(rx->skb);
904 } /* ieee80211_rx_h_sta_process */
906 static inline struct ieee80211_fragment_entry *
907 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
908 unsigned int frag, unsigned int seq, int rx_queue,
909 struct sk_buff **skb)
911 struct ieee80211_fragment_entry *entry;
914 idx = sdata->fragment_next;
915 entry = &sdata->fragments[sdata->fragment_next++];
916 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
917 sdata->fragment_next = 0;
919 if (!skb_queue_empty(&entry->skb_list)) {
920 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
921 struct ieee80211_hdr *hdr =
922 (struct ieee80211_hdr *) entry->skb_list.next->data;
923 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
924 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
925 "addr1=%pM addr2=%pM\n",
926 sdata->dev->name, idx,
927 jiffies - entry->first_frag_time, entry->seq,
928 entry->last_frag, hdr->addr1, hdr->addr2);
930 __skb_queue_purge(&entry->skb_list);
933 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
935 entry->first_frag_time = jiffies;
937 entry->rx_queue = rx_queue;
938 entry->last_frag = frag;
940 entry->extra_len = 0;
945 static inline struct ieee80211_fragment_entry *
946 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
947 unsigned int frag, unsigned int seq,
948 int rx_queue, struct ieee80211_hdr *hdr)
950 struct ieee80211_fragment_entry *entry;
953 idx = sdata->fragment_next;
954 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
955 struct ieee80211_hdr *f_hdr;
959 idx = IEEE80211_FRAGMENT_MAX - 1;
961 entry = &sdata->fragments[idx];
962 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
963 entry->rx_queue != rx_queue ||
964 entry->last_frag + 1 != frag)
967 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
970 * Check ftype and addresses are equal, else check next fragment
972 if (((hdr->frame_control ^ f_hdr->frame_control) &
973 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
974 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
975 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
978 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
979 __skb_queue_purge(&entry->skb_list);
988 static ieee80211_rx_result debug_noinline
989 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
991 struct ieee80211_hdr *hdr;
994 unsigned int frag, seq;
995 struct ieee80211_fragment_entry *entry;
998 hdr = (struct ieee80211_hdr *)rx->skb->data;
999 fc = hdr->frame_control;
1000 sc = le16_to_cpu(hdr->seq_ctrl);
1001 frag = sc & IEEE80211_SCTL_FRAG;
1003 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1004 (rx->skb)->len < 24 ||
1005 is_multicast_ether_addr(hdr->addr1))) {
1006 /* not fragmented */
1009 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1011 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1014 /* This is the first fragment of a new frame. */
1015 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1016 rx->queue, &(rx->skb));
1017 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1018 ieee80211_has_protected(fc)) {
1019 /* Store CCMP PN so that we can verify that the next
1020 * fragment has a sequential PN value. */
1022 memcpy(entry->last_pn,
1023 rx->key->u.ccmp.rx_pn[rx->queue],
1029 /* This is a fragment for a frame that should already be pending in
1030 * fragment cache. Add this fragment to the end of the pending entry.
1032 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1034 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1035 return RX_DROP_MONITOR;
1038 /* Verify that MPDUs within one MSDU have sequential PN values.
1039 * (IEEE 802.11i, 8.3.3.4.5) */
1042 u8 pn[CCMP_PN_LEN], *rpn;
1043 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1044 return RX_DROP_UNUSABLE;
1045 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1046 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1051 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1052 if (memcmp(pn, rpn, CCMP_PN_LEN))
1053 return RX_DROP_UNUSABLE;
1054 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1057 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1058 __skb_queue_tail(&entry->skb_list, rx->skb);
1059 entry->last_frag = frag;
1060 entry->extra_len += rx->skb->len;
1061 if (ieee80211_has_morefrags(fc)) {
1066 rx->skb = __skb_dequeue(&entry->skb_list);
1067 if (skb_tailroom(rx->skb) < entry->extra_len) {
1068 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1069 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1071 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1072 __skb_queue_purge(&entry->skb_list);
1073 return RX_DROP_UNUSABLE;
1076 while ((skb = __skb_dequeue(&entry->skb_list))) {
1077 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1081 /* Complete frame has been reassembled - process it now */
1082 rx->flags |= IEEE80211_RX_FRAGMENTED;
1086 rx->sta->rx_packets++;
1087 if (is_multicast_ether_addr(hdr->addr1))
1088 rx->local->dot11MulticastReceivedFrameCount++;
1090 ieee80211_led_rx(rx->local);
1094 static ieee80211_rx_result debug_noinline
1095 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1097 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1098 struct sk_buff *skb;
1099 int no_pending_pkts;
1100 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1102 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1103 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1106 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1107 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1108 return RX_DROP_UNUSABLE;
1110 skb = skb_dequeue(&rx->sta->tx_filtered);
1112 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1114 rx->local->total_ps_buffered--;
1116 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1117 skb_queue_empty(&rx->sta->ps_tx_buf);
1120 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1121 struct ieee80211_hdr *hdr =
1122 (struct ieee80211_hdr *) skb->data;
1125 * Tell TX path to send this frame even though the STA may
1126 * still remain is PS mode after this frame exchange.
1128 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
1130 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1131 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1132 rx->sta->sta.addr, rx->sta->sta.aid,
1133 skb_queue_len(&rx->sta->ps_tx_buf));
1134 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1136 /* Use MoreData flag to indicate whether there are more
1137 * buffered frames for this STA */
1138 if (no_pending_pkts)
1139 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1141 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1143 ieee80211_add_pending_skb(rx->local, skb);
1145 if (no_pending_pkts)
1146 sta_info_clear_tim_bit(rx->sta);
1147 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1150 * FIXME: This can be the result of a race condition between
1151 * us expiring a frame and the station polling for it.
1152 * Should we send it a null-func frame indicating we
1153 * have nothing buffered for it?
1155 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1156 "though there are no buffered frames for it\n",
1157 rx->dev->name, rx->sta->sta.addr);
1158 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1161 /* Free PS Poll skb here instead of returning RX_DROP that would
1162 * count as an dropped frame. */
1163 dev_kfree_skb(rx->skb);
1168 static ieee80211_rx_result debug_noinline
1169 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1171 u8 *data = rx->skb->data;
1172 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1174 if (!ieee80211_is_data_qos(hdr->frame_control))
1177 /* remove the qos control field, update frame type and meta-data */
1178 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1179 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1180 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1181 /* change frame type to non QOS */
1182 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1188 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1190 if (unlikely(!rx->sta ||
1191 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1198 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1201 * Pass through unencrypted frames if the hardware has
1202 * decrypted them already.
1204 if (rx->status->flag & RX_FLAG_DECRYPTED)
1207 /* Drop unencrypted frames if key is set. */
1208 if (unlikely(!ieee80211_has_protected(fc) &&
1209 !ieee80211_is_nullfunc(fc) &&
1210 ieee80211_is_data(fc) &&
1211 (rx->key || rx->sdata->drop_unencrypted)))
1213 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1214 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1217 /* BIP does not use Protected field, so need to check MMIE */
1218 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1219 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1223 * When using MFP, Action frames are not allowed prior to
1224 * having configured keys.
1226 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1227 ieee80211_is_robust_mgmt_frame(
1228 (struct ieee80211_hdr *) rx->skb->data)))
1236 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1238 struct net_device *dev = rx->dev;
1239 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1241 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
1245 * requires that rx->skb is a frame with ethernet header
1247 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1249 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1250 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1251 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1254 * Allow EAPOL frames to us/the PAE group address regardless
1255 * of whether the frame was encrypted or not.
1257 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1258 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1259 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1262 if (ieee80211_802_1x_port_control(rx) ||
1263 ieee80211_drop_unencrypted(rx, fc))
1270 * requires that rx->skb is a frame with ethernet header
1273 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1275 struct net_device *dev = rx->dev;
1276 struct ieee80211_local *local = rx->local;
1277 struct sk_buff *skb, *xmit_skb;
1278 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1279 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1280 struct sta_info *dsta;
1285 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1286 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1287 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1288 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1289 if (is_multicast_ether_addr(ehdr->h_dest)) {
1291 * send multicast frames both to higher layers in
1292 * local net stack and back to the wireless medium
1294 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1295 if (!xmit_skb && net_ratelimit())
1296 printk(KERN_DEBUG "%s: failed to clone "
1297 "multicast frame\n", dev->name);
1299 dsta = sta_info_get(local, skb->data);
1300 if (dsta && dsta->sdata->dev == dev) {
1302 * The destination station is associated to
1303 * this AP (in this VLAN), so send the frame
1304 * directly to it and do not pass it to local
1314 int align __maybe_unused;
1316 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1318 * 'align' will only take the values 0 or 2 here
1319 * since all frames are required to be aligned
1320 * to 2-byte boundaries when being passed to
1321 * mac80211. That also explains the __skb_push()
1324 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1326 if (WARN_ON(skb_headroom(skb) < 3)) {
1330 u8 *data = skb->data;
1331 size_t len = skb_headlen(skb);
1333 memmove(skb->data, data, len);
1334 skb_set_tail_pointer(skb, len);
1340 /* deliver to local stack */
1341 skb->protocol = eth_type_trans(skb, dev);
1342 memset(skb->cb, 0, sizeof(skb->cb));
1348 /* send to wireless media */
1349 xmit_skb->protocol = htons(ETH_P_802_3);
1350 skb_reset_network_header(xmit_skb);
1351 skb_reset_mac_header(xmit_skb);
1352 dev_queue_xmit(xmit_skb);
1356 static ieee80211_rx_result debug_noinline
1357 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1359 struct net_device *dev = rx->dev;
1360 struct ieee80211_local *local = rx->local;
1363 struct sk_buff *skb = rx->skb, *frame = NULL;
1364 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1365 __le16 fc = hdr->frame_control;
1366 const struct ethhdr *eth;
1371 if (unlikely(!ieee80211_is_data(fc)))
1374 if (unlikely(!ieee80211_is_data_present(fc)))
1375 return RX_DROP_MONITOR;
1377 if (!(rx->flags & IEEE80211_RX_AMSDU))
1380 err = __ieee80211_data_to_8023(rx);
1382 return RX_DROP_UNUSABLE;
1386 dev->stats.rx_packets++;
1387 dev->stats.rx_bytes += skb->len;
1389 /* skip the wrapping header */
1390 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1392 return RX_DROP_UNUSABLE;
1394 while (skb != frame) {
1396 __be16 len = eth->h_proto;
1397 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1399 remaining = skb->len;
1400 memcpy(dst, eth->h_dest, ETH_ALEN);
1401 memcpy(src, eth->h_source, ETH_ALEN);
1403 padding = ((4 - subframe_len) & 0x3);
1404 /* the last MSDU has no padding */
1405 if (subframe_len > remaining)
1406 return RX_DROP_UNUSABLE;
1408 skb_pull(skb, sizeof(struct ethhdr));
1409 /* if last subframe reuse skb */
1410 if (remaining <= subframe_len + padding)
1414 * Allocate and reserve two bytes more for payload
1415 * alignment since sizeof(struct ethhdr) is 14.
1417 frame = dev_alloc_skb(
1418 ALIGN(local->hw.extra_tx_headroom, 4) +
1422 return RX_DROP_UNUSABLE;
1425 ALIGN(local->hw.extra_tx_headroom, 4) +
1426 sizeof(struct ethhdr) + 2);
1427 memcpy(skb_put(frame, ntohs(len)), skb->data,
1430 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1433 dev_kfree_skb(frame);
1434 return RX_DROP_UNUSABLE;
1438 skb_reset_network_header(frame);
1440 frame->priority = skb->priority;
1443 payload = frame->data;
1444 ethertype = (payload[6] << 8) | payload[7];
1446 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1447 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1448 compare_ether_addr(payload,
1449 bridge_tunnel_header) == 0)) {
1450 /* remove RFC1042 or Bridge-Tunnel
1451 * encapsulation and replace EtherType */
1453 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1454 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1456 memcpy(skb_push(frame, sizeof(__be16)),
1457 &len, sizeof(__be16));
1458 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1459 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1462 if (!ieee80211_frame_allowed(rx, fc)) {
1463 if (skb == frame) /* last frame */
1464 return RX_DROP_UNUSABLE;
1465 dev_kfree_skb(frame);
1469 ieee80211_deliver_skb(rx);
1475 #ifdef CONFIG_MAC80211_MESH
1476 static ieee80211_rx_result
1477 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1479 struct ieee80211_hdr *hdr;
1480 struct ieee80211s_hdr *mesh_hdr;
1481 unsigned int hdrlen;
1482 struct sk_buff *skb = rx->skb, *fwd_skb;
1483 struct ieee80211_local *local = rx->local;
1484 struct ieee80211_sub_if_data *sdata;
1486 hdr = (struct ieee80211_hdr *) skb->data;
1487 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1488 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1489 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1491 if (!ieee80211_is_data(hdr->frame_control))
1496 return RX_DROP_MONITOR;
1498 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1499 struct mesh_path *mppath;
1503 if (is_multicast_ether_addr(hdr->addr1)) {
1504 mpp_addr = hdr->addr3;
1505 proxied_addr = mesh_hdr->eaddr1;
1507 mpp_addr = hdr->addr4;
1508 proxied_addr = mesh_hdr->eaddr2;
1512 mppath = mpp_path_lookup(proxied_addr, sdata);
1514 mpp_path_add(proxied_addr, mpp_addr, sdata);
1516 spin_lock_bh(&mppath->state_lock);
1517 mppath->exp_time = jiffies;
1518 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1519 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1520 spin_unlock_bh(&mppath->state_lock);
1525 /* Frame has reached destination. Don't forward */
1526 if (!is_multicast_ether_addr(hdr->addr1) &&
1527 compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1532 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1534 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1535 dropped_frames_ttl);
1537 struct ieee80211_hdr *fwd_hdr;
1538 struct ieee80211_tx_info *info;
1540 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1542 if (!fwd_skb && net_ratelimit())
1543 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1546 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1547 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1548 info = IEEE80211_SKB_CB(fwd_skb);
1549 memset(info, 0, sizeof(*info));
1550 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1551 info->control.vif = &rx->sdata->vif;
1552 ieee80211_select_queue(local, fwd_skb);
1553 if (is_multicast_ether_addr(fwd_hdr->addr1))
1554 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1559 * Save TA to addr1 to send TA a path error if a
1560 * suitable next hop is not found
1562 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1564 err = mesh_nexthop_lookup(fwd_skb, sdata);
1565 /* Failed to immediately resolve next hop:
1566 * fwded frame was dropped or will be added
1567 * later to the pending skb queue. */
1569 return RX_DROP_MONITOR;
1571 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1574 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1576 ieee80211_add_pending_skb(local, fwd_skb);
1580 if (is_multicast_ether_addr(hdr->addr1) ||
1581 rx->dev->flags & IFF_PROMISC)
1584 return RX_DROP_MONITOR;
1588 static ieee80211_rx_result debug_noinline
1589 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1591 struct net_device *dev = rx->dev;
1592 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1593 __le16 fc = hdr->frame_control;
1596 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1599 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1600 return RX_DROP_MONITOR;
1602 err = __ieee80211_data_to_8023(rx);
1604 return RX_DROP_UNUSABLE;
1606 if (!ieee80211_frame_allowed(rx, fc))
1607 return RX_DROP_MONITOR;
1611 dev->stats.rx_packets++;
1612 dev->stats.rx_bytes += rx->skb->len;
1614 ieee80211_deliver_skb(rx);
1619 static ieee80211_rx_result debug_noinline
1620 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1622 struct ieee80211_local *local = rx->local;
1623 struct ieee80211_hw *hw = &local->hw;
1624 struct sk_buff *skb = rx->skb;
1625 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1626 struct tid_ampdu_rx *tid_agg_rx;
1630 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1633 if (ieee80211_is_back_req(bar->frame_control)) {
1636 tid = le16_to_cpu(bar->control) >> 12;
1637 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1638 != HT_AGG_STATE_OPERATIONAL)
1640 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1642 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1644 /* reset session timer */
1645 if (tid_agg_rx->timeout)
1646 mod_timer(&tid_agg_rx->session_timer,
1647 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1649 /* manage reordering buffer according to requested */
1650 /* sequence number */
1652 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1655 return RX_DROP_UNUSABLE;
1661 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1662 struct ieee80211_mgmt *mgmt,
1665 struct ieee80211_local *local = sdata->local;
1666 struct sk_buff *skb;
1667 struct ieee80211_mgmt *resp;
1669 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1670 /* Not to own unicast address */
1674 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1675 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1676 /* Not from the current AP or not associated yet. */
1680 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1681 /* Too short SA Query request frame */
1685 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1689 skb_reserve(skb, local->hw.extra_tx_headroom);
1690 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1691 memset(resp, 0, 24);
1692 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1693 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1694 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1695 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1696 IEEE80211_STYPE_ACTION);
1697 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1698 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1699 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1700 memcpy(resp->u.action.u.sa_query.trans_id,
1701 mgmt->u.action.u.sa_query.trans_id,
1702 WLAN_SA_QUERY_TR_ID_LEN);
1704 ieee80211_tx_skb(sdata, skb, 1);
1707 static ieee80211_rx_result debug_noinline
1708 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1710 struct ieee80211_local *local = rx->local;
1711 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1712 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1713 int len = rx->skb->len;
1715 if (!ieee80211_is_action(mgmt->frame_control))
1719 return RX_DROP_MONITOR;
1721 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1722 return RX_DROP_MONITOR;
1724 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1725 return RX_DROP_MONITOR;
1727 /* all categories we currently handle have action_code */
1728 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1729 return RX_DROP_MONITOR;
1731 switch (mgmt->u.action.category) {
1732 case WLAN_CATEGORY_BACK:
1734 * The aggregation code is not prepared to handle
1735 * anything but STA/AP due to the BSSID handling;
1736 * IBSS could work in the code but isn't supported
1737 * by drivers or the standard.
1739 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1740 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1741 sdata->vif.type != NL80211_IFTYPE_AP)
1742 return RX_DROP_MONITOR;
1744 switch (mgmt->u.action.u.addba_req.action_code) {
1745 case WLAN_ACTION_ADDBA_REQ:
1746 if (len < (IEEE80211_MIN_ACTION_SIZE +
1747 sizeof(mgmt->u.action.u.addba_req)))
1748 return RX_DROP_MONITOR;
1749 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1751 case WLAN_ACTION_ADDBA_RESP:
1752 if (len < (IEEE80211_MIN_ACTION_SIZE +
1753 sizeof(mgmt->u.action.u.addba_resp)))
1754 return RX_DROP_MONITOR;
1755 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1757 case WLAN_ACTION_DELBA:
1758 if (len < (IEEE80211_MIN_ACTION_SIZE +
1759 sizeof(mgmt->u.action.u.delba)))
1760 return RX_DROP_MONITOR;
1761 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1765 case WLAN_CATEGORY_SPECTRUM_MGMT:
1766 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1767 return RX_DROP_MONITOR;
1769 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1770 return RX_DROP_MONITOR;
1772 switch (mgmt->u.action.u.measurement.action_code) {
1773 case WLAN_ACTION_SPCT_MSR_REQ:
1774 if (len < (IEEE80211_MIN_ACTION_SIZE +
1775 sizeof(mgmt->u.action.u.measurement)))
1776 return RX_DROP_MONITOR;
1777 ieee80211_process_measurement_req(sdata, mgmt, len);
1779 case WLAN_ACTION_SPCT_CHL_SWITCH:
1780 if (len < (IEEE80211_MIN_ACTION_SIZE +
1781 sizeof(mgmt->u.action.u.chan_switch)))
1782 return RX_DROP_MONITOR;
1784 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1785 return RX_DROP_MONITOR;
1787 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1788 return RX_DROP_MONITOR;
1790 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1793 case WLAN_CATEGORY_SA_QUERY:
1794 if (len < (IEEE80211_MIN_ACTION_SIZE +
1795 sizeof(mgmt->u.action.u.sa_query)))
1796 return RX_DROP_MONITOR;
1797 switch (mgmt->u.action.u.sa_query.action) {
1798 case WLAN_ACTION_SA_QUERY_REQUEST:
1799 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1800 return RX_DROP_MONITOR;
1801 ieee80211_process_sa_query_req(sdata, mgmt, len);
1803 case WLAN_ACTION_SA_QUERY_RESPONSE:
1805 * SA Query response is currently only used in AP mode
1806 * and it is processed in user space.
1815 rx->sta->rx_packets++;
1816 dev_kfree_skb(rx->skb);
1820 static ieee80211_rx_result debug_noinline
1821 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1823 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1824 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1826 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1827 return RX_DROP_MONITOR;
1829 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1830 return RX_DROP_MONITOR;
1832 if (ieee80211_vif_is_mesh(&sdata->vif))
1833 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
1835 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
1836 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
1838 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1839 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1841 return RX_DROP_MONITOR;
1844 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
1845 struct ieee80211_rx_data *rx)
1848 unsigned int hdrlen;
1850 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1851 if (rx->skb->len >= hdrlen + 4)
1852 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1858 * Some hardware seem to generate incorrect Michael MIC
1859 * reports; ignore them to avoid triggering countermeasures.
1864 if (!ieee80211_has_protected(hdr->frame_control))
1867 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1869 * APs with pairwise keys should never receive Michael MIC
1870 * errors for non-zero keyidx because these are reserved for
1871 * group keys and only the AP is sending real multicast
1872 * frames in the BSS.
1877 if (!ieee80211_is_data(hdr->frame_control) &&
1878 !ieee80211_is_auth(hdr->frame_control))
1881 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1884 dev_kfree_skb(rx->skb);
1888 /* TODO: use IEEE80211_RX_FRAGMENTED */
1889 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1891 struct ieee80211_sub_if_data *sdata;
1892 struct ieee80211_local *local = rx->local;
1893 struct ieee80211_rtap_hdr {
1894 struct ieee80211_radiotap_header hdr;
1899 } __attribute__ ((packed)) *rthdr;
1900 struct sk_buff *skb = rx->skb, *skb2;
1901 struct net_device *prev_dev = NULL;
1902 struct ieee80211_rx_status *status = rx->status;
1904 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1907 if (skb_headroom(skb) < sizeof(*rthdr) &&
1908 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1911 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1912 memset(rthdr, 0, sizeof(*rthdr));
1913 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1914 rthdr->hdr.it_present =
1915 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1916 (1 << IEEE80211_RADIOTAP_RATE) |
1917 (1 << IEEE80211_RADIOTAP_CHANNEL));
1919 rthdr->rate = rx->rate->bitrate / 5;
1920 rthdr->chan_freq = cpu_to_le16(status->freq);
1922 if (status->band == IEEE80211_BAND_5GHZ)
1923 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1924 IEEE80211_CHAN_5GHZ);
1926 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1927 IEEE80211_CHAN_2GHZ);
1929 skb_set_mac_header(skb, 0);
1930 skb->ip_summed = CHECKSUM_UNNECESSARY;
1931 skb->pkt_type = PACKET_OTHERHOST;
1932 skb->protocol = htons(ETH_P_802_2);
1934 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1935 if (!netif_running(sdata->dev))
1938 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1939 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1943 skb2 = skb_clone(skb, GFP_ATOMIC);
1945 skb2->dev = prev_dev;
1950 prev_dev = sdata->dev;
1951 sdata->dev->stats.rx_packets++;
1952 sdata->dev->stats.rx_bytes += skb->len;
1956 skb->dev = prev_dev;
1962 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1970 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1971 struct ieee80211_rx_data *rx,
1972 struct sk_buff *skb)
1974 ieee80211_rx_result res = RX_DROP_MONITOR;
1978 rx->dev = sdata->dev;
1980 #define CALL_RXH(rxh) \
1983 if (res != RX_CONTINUE) \
1987 CALL_RXH(ieee80211_rx_h_passive_scan)
1988 CALL_RXH(ieee80211_rx_h_check)
1989 CALL_RXH(ieee80211_rx_h_decrypt)
1990 CALL_RXH(ieee80211_rx_h_check_more_data)
1991 CALL_RXH(ieee80211_rx_h_sta_process)
1992 CALL_RXH(ieee80211_rx_h_defragment)
1993 CALL_RXH(ieee80211_rx_h_ps_poll)
1994 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1995 /* must be after MMIC verify so header is counted in MPDU mic */
1996 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1997 CALL_RXH(ieee80211_rx_h_amsdu)
1998 #ifdef CONFIG_MAC80211_MESH
1999 if (ieee80211_vif_is_mesh(&sdata->vif))
2000 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2002 CALL_RXH(ieee80211_rx_h_data)
2003 CALL_RXH(ieee80211_rx_h_ctrl)
2004 CALL_RXH(ieee80211_rx_h_action)
2005 CALL_RXH(ieee80211_rx_h_mgmt)
2011 case RX_DROP_MONITOR:
2012 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2014 rx->sta->rx_dropped++;
2017 ieee80211_rx_cooked_monitor(rx);
2019 case RX_DROP_UNUSABLE:
2020 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2022 rx->sta->rx_dropped++;
2023 dev_kfree_skb(rx->skb);
2026 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2031 /* main receive path */
2033 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2034 struct ieee80211_rx_data *rx,
2035 struct ieee80211_hdr *hdr)
2037 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
2038 int multicast = is_multicast_ether_addr(hdr->addr1);
2040 switch (sdata->vif.type) {
2041 case NL80211_IFTYPE_STATION:
2045 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
2046 if (!(sdata->dev->flags & IFF_PROMISC))
2048 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2051 case NL80211_IFTYPE_ADHOC:
2054 if (ieee80211_is_beacon(hdr->frame_control)) {
2057 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2058 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2060 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2061 } else if (!multicast &&
2062 compare_ether_addr(sdata->dev->dev_addr,
2064 if (!(sdata->dev->flags & IFF_PROMISC))
2066 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2067 } else if (!rx->sta) {
2069 if (rx->status->flag & RX_FLAG_HT)
2070 rate_idx = 0; /* TODO: HT rates */
2072 rate_idx = rx->status->rate_idx;
2073 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2077 case NL80211_IFTYPE_MESH_POINT:
2079 compare_ether_addr(sdata->dev->dev_addr,
2081 if (!(sdata->dev->flags & IFF_PROMISC))
2084 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2087 case NL80211_IFTYPE_AP_VLAN:
2088 case NL80211_IFTYPE_AP:
2090 if (compare_ether_addr(sdata->dev->dev_addr,
2093 } else if (!ieee80211_bssid_match(bssid,
2094 sdata->dev->dev_addr)) {
2095 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2097 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2100 case NL80211_IFTYPE_WDS:
2101 if (bssid || !ieee80211_is_data(hdr->frame_control))
2103 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2106 case NL80211_IFTYPE_MONITOR:
2107 /* take everything */
2109 case NL80211_IFTYPE_UNSPECIFIED:
2110 case __NL80211_IFTYPE_AFTER_LAST:
2111 /* should never get here */
2120 * This is the actual Rx frames handler. as it blongs to Rx path it must
2121 * be called with rcu_read_lock protection.
2123 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2124 struct sk_buff *skb,
2125 struct ieee80211_rate *rate)
2127 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2128 struct ieee80211_local *local = hw_to_local(hw);
2129 struct ieee80211_sub_if_data *sdata;
2130 struct ieee80211_hdr *hdr;
2131 struct ieee80211_rx_data rx;
2133 struct ieee80211_sub_if_data *prev = NULL;
2134 struct sk_buff *skb_new;
2136 hdr = (struct ieee80211_hdr *)skb->data;
2137 memset(&rx, 0, sizeof(rx));
2144 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2145 local->dot11ReceivedFragmentCount++;
2147 rx.sta = sta_info_get(local, hdr->addr2);
2149 rx.sdata = rx.sta->sdata;
2150 rx.dev = rx.sta->sdata->dev;
2153 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
2154 ieee80211_rx_michael_mic_report(hdr, &rx);
2158 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2159 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2160 rx.flags |= IEEE80211_RX_IN_SCAN;
2162 ieee80211_parse_qos(&rx);
2163 ieee80211_verify_alignment(&rx);
2167 if (rx.sdata && ieee80211_is_data(hdr->frame_control)) {
2168 rx.flags |= IEEE80211_RX_RA_MATCH;
2169 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2172 } else list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2173 if (!netif_running(sdata->dev))
2176 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2177 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2180 rx.flags |= IEEE80211_RX_RA_MATCH;
2181 prepares = prepare_for_handlers(sdata, &rx, hdr);
2187 * frame is destined for this interface, but if it's not
2188 * also for the previous one we handle that after the
2189 * loop to avoid copying the SKB once too much
2198 * frame was destined for the previous interface
2199 * so invoke RX handlers for it
2202 skb_new = skb_copy(skb, GFP_ATOMIC);
2204 if (net_ratelimit())
2205 printk(KERN_DEBUG "%s: failed to copy "
2206 "multicast frame for %s\n",
2207 wiphy_name(local->hw.wiphy),
2211 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2215 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2220 #define SEQ_MODULO 0x1000
2221 #define SEQ_MASK 0xfff
2223 static inline int seq_less(u16 sq1, u16 sq2)
2225 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2228 static inline u16 seq_inc(u16 sq)
2230 return (sq + 1) & SEQ_MASK;
2233 static inline u16 seq_sub(u16 sq1, u16 sq2)
2235 return (sq1 - sq2) & SEQ_MASK;
2239 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2240 struct tid_ampdu_rx *tid_agg_rx,
2243 struct ieee80211_supported_band *sband;
2244 struct ieee80211_rate *rate;
2245 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2246 struct ieee80211_rx_status *status;
2251 status = IEEE80211_SKB_RXCB(skb);
2253 /* release the reordered frames to stack */
2254 sband = hw->wiphy->bands[status->band];
2255 if (status->flag & RX_FLAG_HT)
2256 rate = sband->bitrates; /* TODO: HT rates */
2258 rate = &sband->bitrates[status->rate_idx];
2259 __ieee80211_rx_handle_packet(hw, skb, rate);
2260 tid_agg_rx->stored_mpdu_num--;
2261 tid_agg_rx->reorder_buf[index] = NULL;
2264 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2269 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2270 * the skb was added to the buffer longer than this time ago, the earlier
2271 * frames that have not yet been received are assumed to be lost and the skb
2272 * can be released for processing. This may also release other skb's from the
2273 * reorder buffer if there are no additional gaps between the frames.
2275 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2278 * As it function blongs to Rx path it must be called with
2279 * the proper rcu_read_lock protection for its flow.
2281 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2282 struct tid_ampdu_rx *tid_agg_rx,
2283 struct sk_buff *skb,
2287 u16 head_seq_num, buf_size;
2290 buf_size = tid_agg_rx->buf_size;
2291 head_seq_num = tid_agg_rx->head_seq_num;
2293 /* frame with out of date sequence number */
2294 if (seq_less(mpdu_seq_num, head_seq_num)) {
2299 /* if frame sequence number exceeds our buffering window size or
2300 * block Ack Request arrived - release stored frames */
2301 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2302 /* new head to the ordering buffer */
2304 head_seq_num = mpdu_seq_num;
2307 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2308 /* release stored frames up to new head to stack */
2309 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2310 index = seq_sub(tid_agg_rx->head_seq_num,
2312 % tid_agg_rx->buf_size;
2313 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2320 /* now the new frame is always in the range of the reordering */
2322 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2323 % tid_agg_rx->buf_size;
2324 /* check if we already stored this frame */
2325 if (tid_agg_rx->reorder_buf[index]) {
2330 /* if arrived mpdu is in the right order and nothing else stored */
2331 /* release it immediately */
2332 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2333 tid_agg_rx->stored_mpdu_num == 0) {
2334 tid_agg_rx->head_seq_num =
2335 seq_inc(tid_agg_rx->head_seq_num);
2339 /* put the frame in the reordering buffer */
2340 tid_agg_rx->reorder_buf[index] = skb;
2341 tid_agg_rx->reorder_time[index] = jiffies;
2342 tid_agg_rx->stored_mpdu_num++;
2343 /* release the buffer until next missing frame */
2344 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2345 % tid_agg_rx->buf_size;
2346 if (!tid_agg_rx->reorder_buf[index] &&
2347 tid_agg_rx->stored_mpdu_num > 1) {
2349 * No buffers ready to be released, but check whether any
2350 * frames in the reorder buffer have timed out.
2354 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2355 j = (j + 1) % tid_agg_rx->buf_size) {
2356 if (tid_agg_rx->reorder_buf[j] == NULL) {
2360 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2364 #ifdef CONFIG_MAC80211_HT_DEBUG
2365 if (net_ratelimit())
2366 printk(KERN_DEBUG "%s: release an RX reorder "
2367 "frame due to timeout on earlier "
2369 wiphy_name(hw->wiphy));
2371 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2374 * Increment the head seq# also for the skipped slots.
2376 tid_agg_rx->head_seq_num =
2377 (tid_agg_rx->head_seq_num + skipped) &
2381 } else while (tid_agg_rx->reorder_buf[index]) {
2382 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
2383 index = seq_sub(tid_agg_rx->head_seq_num,
2384 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2389 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2390 struct sk_buff *skb)
2392 struct ieee80211_hw *hw = &local->hw;
2393 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2394 struct sta_info *sta;
2395 struct tid_ampdu_rx *tid_agg_rx;
2401 sta = sta_info_get(local, hdr->addr2);
2405 /* filter the QoS data rx stream according to
2406 * STA/TID and check if this STA/TID is on aggregation */
2407 if (!ieee80211_is_data_qos(hdr->frame_control))
2410 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2412 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2415 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2417 /* qos null data frames are excluded */
2418 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2421 /* new un-ordered ampdu frame - process it */
2423 /* reset session timer */
2424 if (tid_agg_rx->timeout)
2425 mod_timer(&tid_agg_rx->session_timer,
2426 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2428 /* if this mpdu is fragmented - terminate rx aggregation session */
2429 sc = le16_to_cpu(hdr->seq_ctrl);
2430 if (sc & IEEE80211_SCTL_FRAG) {
2431 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2432 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2437 /* according to mpdu sequence number deal with reordering buffer */
2438 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2439 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2446 * This is the receive path handler. It is called by a low level driver when an
2447 * 802.11 MPDU is received from the hardware.
2449 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2451 struct ieee80211_local *local = hw_to_local(hw);
2452 struct ieee80211_rate *rate = NULL;
2453 struct ieee80211_supported_band *sband;
2454 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2456 WARN_ON_ONCE(softirq_count() == 0);
2458 if (WARN_ON(status->band < 0 ||
2459 status->band >= IEEE80211_NUM_BANDS))
2462 sband = local->hw.wiphy->bands[status->band];
2463 if (WARN_ON(!sband))
2467 * If we're suspending, it is possible although not too likely
2468 * that we'd be receiving frames after having already partially
2469 * quiesced the stack. We can't process such frames then since
2470 * that might, for example, cause stations to be added or other
2471 * driver callbacks be invoked.
2473 if (unlikely(local->quiescing || local->suspended))
2477 * The same happens when we're not even started,
2478 * but that's worth a warning.
2480 if (WARN_ON(!local->started))
2483 if (status->flag & RX_FLAG_HT) {
2484 /* rate_idx is MCS index */
2485 if (WARN_ON(status->rate_idx < 0 ||
2486 status->rate_idx >= 76))
2488 /* HT rates are not in the table - use the highest legacy rate
2489 * for now since other parts of mac80211 may not yet be fully
2491 rate = &sband->bitrates[sband->n_bitrates - 1];
2493 if (WARN_ON(status->rate_idx < 0 ||
2494 status->rate_idx >= sband->n_bitrates))
2496 rate = &sband->bitrates[status->rate_idx];
2500 * key references and virtual interfaces are protected using RCU
2501 * and this requires that we are in a read-side RCU section during
2502 * receive processing
2507 * Frames with failed FCS/PLCP checksum are not returned,
2508 * all other frames are returned without radiotap header
2509 * if it was previously present.
2510 * Also, frames with less than 16 bytes are dropped.
2512 skb = ieee80211_rx_monitor(local, skb, rate);
2519 * In theory, the block ack reordering should happen after duplicate
2520 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2521 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2522 * happen as a new RX handler between ieee80211_rx_h_check and
2523 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2524 * the time being, the call can be here since RX reorder buf processing
2525 * will implicitly skip duplicates. We could, in theory at least,
2526 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2527 * frames from other than operational channel), but that should not
2528 * happen in normal networks.
2530 if (!ieee80211_rx_reorder_ampdu(local, skb))
2531 __ieee80211_rx_handle_packet(hw, skb, rate);
2539 EXPORT_SYMBOL(ieee80211_rx);
2541 /* This is a version of the rx handler that can be called from hard irq
2542 * context. Post the skb on the queue and schedule the tasklet */
2543 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2545 struct ieee80211_local *local = hw_to_local(hw);
2547 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2549 skb->pkt_type = IEEE80211_RX_MSG;
2550 skb_queue_tail(&local->skb_queue, skb);
2551 tasklet_schedule(&local->tasklet);
2553 EXPORT_SYMBOL(ieee80211_rx_irqsafe);