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 (rx->flags & IEEE80211_RX_IN_SCAN))) {
426 /* drop all the other packets during a software scan anyway */
427 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
432 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
433 /* scanning finished during invoking of handlers */
434 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
435 return RX_DROP_UNUSABLE;
442 static int ieee80211_is_unicast_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 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
455 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
457 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
460 return ieee80211_is_robust_mgmt_frame(hdr);
464 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
465 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
467 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
468 struct ieee80211_mmie *mmie;
470 if (skb->len < 24 + sizeof(*mmie) ||
471 !is_multicast_ether_addr(hdr->da))
474 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
475 return -1; /* not a robust management frame */
477 mmie = (struct ieee80211_mmie *)
478 (skb->data + skb->len - sizeof(*mmie));
479 if (mmie->element_id != WLAN_EID_MMIE ||
480 mmie->length != sizeof(*mmie) - 2)
483 return le16_to_cpu(mmie->key_id);
487 static ieee80211_rx_result
488 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
490 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
491 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
492 char *dev_addr = rx->dev->dev_addr;
494 if (ieee80211_is_data(hdr->frame_control)) {
495 if (is_multicast_ether_addr(hdr->addr1)) {
496 if (ieee80211_has_tods(hdr->frame_control) ||
497 !ieee80211_has_fromds(hdr->frame_control))
498 return RX_DROP_MONITOR;
499 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
500 return RX_DROP_MONITOR;
502 if (!ieee80211_has_a4(hdr->frame_control))
503 return RX_DROP_MONITOR;
504 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
505 return RX_DROP_MONITOR;
509 /* If there is not an established peer link and this is not a peer link
510 * establisment frame, beacon or probe, drop the frame.
513 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
514 struct ieee80211_mgmt *mgmt;
516 if (!ieee80211_is_mgmt(hdr->frame_control))
517 return RX_DROP_MONITOR;
519 if (ieee80211_is_action(hdr->frame_control)) {
520 mgmt = (struct ieee80211_mgmt *)hdr;
521 if (mgmt->u.action.category != PLINK_CATEGORY)
522 return RX_DROP_MONITOR;
526 if (ieee80211_is_probe_req(hdr->frame_control) ||
527 ieee80211_is_probe_resp(hdr->frame_control) ||
528 ieee80211_is_beacon(hdr->frame_control))
531 return RX_DROP_MONITOR;
535 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
537 if (ieee80211_is_data(hdr->frame_control) &&
538 is_multicast_ether_addr(hdr->addr1) &&
539 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
540 return RX_DROP_MONITOR;
547 static ieee80211_rx_result debug_noinline
548 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
550 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
552 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
553 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
554 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
555 rx->sta->last_seq_ctrl[rx->queue] ==
557 if (rx->flags & IEEE80211_RX_RA_MATCH) {
558 rx->local->dot11FrameDuplicateCount++;
559 rx->sta->num_duplicates++;
561 return RX_DROP_MONITOR;
563 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
566 if (unlikely(rx->skb->len < 16)) {
567 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
568 return RX_DROP_MONITOR;
571 /* Drop disallowed frame classes based on STA auth/assoc state;
572 * IEEE 802.11, Chap 5.5.
574 * mac80211 filters only based on association state, i.e. it drops
575 * Class 3 frames from not associated stations. hostapd sends
576 * deauth/disassoc frames when needed. In addition, hostapd is
577 * responsible for filtering on both auth and assoc states.
580 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
581 return ieee80211_rx_mesh_check(rx);
583 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
584 ieee80211_is_pspoll(hdr->frame_control)) &&
585 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
586 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
587 if ((!ieee80211_has_fromds(hdr->frame_control) &&
588 !ieee80211_has_tods(hdr->frame_control) &&
589 ieee80211_is_data(hdr->frame_control)) ||
590 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
591 /* Drop IBSS frames and frames for other hosts
593 return RX_DROP_MONITOR;
596 return RX_DROP_MONITOR;
603 static ieee80211_rx_result debug_noinline
604 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
606 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
609 ieee80211_rx_result result = RX_DROP_UNUSABLE;
610 struct ieee80211_key *stakey = NULL;
611 int mmie_keyidx = -1;
616 * There are four types of keys:
618 * - IGTK (group keys for management frames)
619 * - PTK (pairwise keys)
620 * - STK (station-to-station pairwise keys)
622 * When selecting a key, we have to distinguish between multicast
623 * (including broadcast) and unicast frames, the latter can only
624 * use PTKs and STKs while the former always use GTKs and IGTKs.
625 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
626 * unicast frames can also use key indices like GTKs. Hence, if we
627 * don't have a PTK/STK we check the key index for a WEP key.
629 * Note that in a regular BSS, multicast frames are sent by the
630 * AP only, associated stations unicast the frame to the AP first
631 * which then multicasts it on their behalf.
633 * There is also a slight problem in IBSS mode: GTKs are negotiated
634 * with each station, that is something we don't currently handle.
635 * The spec seems to expect that one negotiates the same key with
636 * every station but there's no such requirement; VLANs could be
641 * No point in finding a key and decrypting if the frame is neither
642 * addressed to us nor a multicast frame.
644 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
648 stakey = rcu_dereference(rx->sta->key);
650 if (!ieee80211_has_protected(hdr->frame_control))
651 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
653 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
655 /* Skip decryption if the frame is not protected. */
656 if (!ieee80211_has_protected(hdr->frame_control))
658 } else if (mmie_keyidx >= 0) {
659 /* Broadcast/multicast robust management frame / BIP */
660 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
661 (rx->status->flag & RX_FLAG_IV_STRIPPED))
664 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
665 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
666 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
667 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
668 } else if (!ieee80211_has_protected(hdr->frame_control)) {
670 * The frame was not protected, so skip decryption. However, we
671 * need to set rx->key if there is a key that could have been
672 * used so that the frame may be dropped if encryption would
673 * have been expected.
675 struct ieee80211_key *key = NULL;
676 if (ieee80211_is_mgmt(hdr->frame_control) &&
677 is_multicast_ether_addr(hdr->addr1) &&
678 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
680 else if ((key = rcu_dereference(rx->sdata->default_key)))
685 * The device doesn't give us the IV so we won't be
686 * able to look up the key. That's ok though, we
687 * don't need to decrypt the frame, we just won't
688 * be able to keep statistics accurate.
689 * Except for key threshold notifications, should
690 * we somehow allow the driver to tell us which key
691 * the hardware used if this flag is set?
693 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
694 (rx->status->flag & RX_FLAG_IV_STRIPPED))
697 hdrlen = ieee80211_hdrlen(hdr->frame_control);
699 if (rx->skb->len < 8 + hdrlen)
700 return RX_DROP_UNUSABLE; /* TODO: count this? */
703 * no need to call ieee80211_wep_get_keyidx,
704 * it verifies a bunch of things we've done already
706 keyidx = rx->skb->data[hdrlen + 3] >> 6;
708 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
711 * RSNA-protected unicast frames should always be sent with
712 * pairwise or station-to-station keys, but for WEP we allow
713 * using a key index as well.
715 if (rx->key && rx->key->conf.alg != ALG_WEP &&
716 !is_multicast_ether_addr(hdr->addr1))
721 rx->key->tx_rx_count++;
722 /* TODO: add threshold stuff again */
724 return RX_DROP_MONITOR;
727 /* Check for weak IVs if possible */
728 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
729 ieee80211_is_data(hdr->frame_control) &&
730 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
731 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
732 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
733 rx->sta->wep_weak_iv_count++;
735 switch (rx->key->conf.alg) {
737 result = ieee80211_crypto_wep_decrypt(rx);
740 result = ieee80211_crypto_tkip_decrypt(rx);
743 result = ieee80211_crypto_ccmp_decrypt(rx);
746 result = ieee80211_crypto_aes_cmac_decrypt(rx);
750 /* either the frame has been decrypted or will be dropped */
751 rx->status->flag |= RX_FLAG_DECRYPTED;
756 static ieee80211_rx_result debug_noinline
757 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
759 struct ieee80211_local *local;
760 struct ieee80211_hdr *hdr;
765 hdr = (struct ieee80211_hdr *) skb->data;
767 if (!local->pspolling)
770 if (!ieee80211_has_fromds(hdr->frame_control))
771 /* this is not from AP */
774 if (!ieee80211_is_data(hdr->frame_control))
777 if (!ieee80211_has_moredata(hdr->frame_control)) {
778 /* AP has no more frames buffered for us */
779 local->pspolling = false;
783 /* more data bit is set, let's request a new frame from the AP */
784 ieee80211_send_pspoll(local, rx->sdata);
789 static void ap_sta_ps_start(struct sta_info *sta)
791 struct ieee80211_sub_if_data *sdata = sta->sdata;
792 struct ieee80211_local *local = sdata->local;
794 atomic_inc(&sdata->bss->num_sta_ps);
795 set_sta_flags(sta, WLAN_STA_PS);
796 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
797 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
798 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
799 sdata->dev->name, sta->sta.addr, sta->sta.aid);
800 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
803 static int ap_sta_ps_end(struct sta_info *sta)
805 struct ieee80211_sub_if_data *sdata = sta->sdata;
806 struct ieee80211_local *local = sdata->local;
809 atomic_dec(&sdata->bss->num_sta_ps);
811 clear_sta_flags(sta, WLAN_STA_PS);
812 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
814 if (!skb_queue_empty(&sta->ps_tx_buf))
815 sta_info_clear_tim_bit(sta);
817 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
818 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
819 sdata->dev->name, sta->sta.addr, sta->sta.aid);
820 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
822 /* Send all buffered frames to the station */
823 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
824 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
826 local->total_ps_buffered -= buffered;
828 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
829 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
830 "since STA not sleeping anymore\n", sdata->dev->name,
831 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
832 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
837 static ieee80211_rx_result debug_noinline
838 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
840 struct sta_info *sta = rx->sta;
841 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
847 * Update last_rx only for IBSS packets which are for the current
848 * BSSID to avoid keeping the current IBSS network alive in cases
849 * where other STAs start using different BSSID.
851 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
852 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
853 NL80211_IFTYPE_ADHOC);
854 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
855 sta->last_rx = jiffies;
856 } else if (!is_multicast_ether_addr(hdr->addr1)) {
858 * Mesh beacons will update last_rx when if they are found to
859 * match the current local configuration when processed.
861 sta->last_rx = jiffies;
864 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
867 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
868 ieee80211_sta_rx_notify(rx->sdata, hdr);
871 sta->rx_bytes += rx->skb->len;
872 sta->last_signal = rx->status->signal;
873 sta->last_qual = rx->status->qual;
874 sta->last_noise = rx->status->noise;
877 * Change STA power saving mode only at the end of a frame
880 if (!ieee80211_has_morefrags(hdr->frame_control) &&
881 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
882 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
883 if (test_sta_flags(sta, WLAN_STA_PS)) {
885 * Ignore doze->wake transitions that are
886 * indicated by non-data frames, the standard
887 * is unclear here, but for example going to
888 * PS mode and then scanning would cause a
889 * doze->wake transition for the probe request,
890 * and that is clearly undesirable.
892 if (ieee80211_is_data(hdr->frame_control) &&
893 !ieee80211_has_pm(hdr->frame_control))
894 rx->sent_ps_buffered += ap_sta_ps_end(sta);
896 if (ieee80211_has_pm(hdr->frame_control))
897 ap_sta_ps_start(sta);
901 /* Drop data::nullfunc frames silently, since they are used only to
902 * control station power saving mode. */
903 if (ieee80211_is_nullfunc(hdr->frame_control)) {
904 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
905 /* Update counter and free packet here to avoid counting this
906 * as a dropped packed. */
908 dev_kfree_skb(rx->skb);
913 } /* ieee80211_rx_h_sta_process */
915 static inline struct ieee80211_fragment_entry *
916 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
917 unsigned int frag, unsigned int seq, int rx_queue,
918 struct sk_buff **skb)
920 struct ieee80211_fragment_entry *entry;
923 idx = sdata->fragment_next;
924 entry = &sdata->fragments[sdata->fragment_next++];
925 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
926 sdata->fragment_next = 0;
928 if (!skb_queue_empty(&entry->skb_list)) {
929 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
930 struct ieee80211_hdr *hdr =
931 (struct ieee80211_hdr *) entry->skb_list.next->data;
932 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
933 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
934 "addr1=%pM addr2=%pM\n",
935 sdata->dev->name, idx,
936 jiffies - entry->first_frag_time, entry->seq,
937 entry->last_frag, hdr->addr1, hdr->addr2);
939 __skb_queue_purge(&entry->skb_list);
942 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
944 entry->first_frag_time = jiffies;
946 entry->rx_queue = rx_queue;
947 entry->last_frag = frag;
949 entry->extra_len = 0;
954 static inline struct ieee80211_fragment_entry *
955 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
956 unsigned int frag, unsigned int seq,
957 int rx_queue, struct ieee80211_hdr *hdr)
959 struct ieee80211_fragment_entry *entry;
962 idx = sdata->fragment_next;
963 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
964 struct ieee80211_hdr *f_hdr;
968 idx = IEEE80211_FRAGMENT_MAX - 1;
970 entry = &sdata->fragments[idx];
971 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
972 entry->rx_queue != rx_queue ||
973 entry->last_frag + 1 != frag)
976 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
979 * Check ftype and addresses are equal, else check next fragment
981 if (((hdr->frame_control ^ f_hdr->frame_control) &
982 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
983 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
984 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
987 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
988 __skb_queue_purge(&entry->skb_list);
997 static ieee80211_rx_result debug_noinline
998 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1000 struct ieee80211_hdr *hdr;
1003 unsigned int frag, seq;
1004 struct ieee80211_fragment_entry *entry;
1005 struct sk_buff *skb;
1007 hdr = (struct ieee80211_hdr *)rx->skb->data;
1008 fc = hdr->frame_control;
1009 sc = le16_to_cpu(hdr->seq_ctrl);
1010 frag = sc & IEEE80211_SCTL_FRAG;
1012 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1013 (rx->skb)->len < 24 ||
1014 is_multicast_ether_addr(hdr->addr1))) {
1015 /* not fragmented */
1018 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1020 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1023 /* This is the first fragment of a new frame. */
1024 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1025 rx->queue, &(rx->skb));
1026 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1027 ieee80211_has_protected(fc)) {
1028 /* Store CCMP PN so that we can verify that the next
1029 * fragment has a sequential PN value. */
1031 memcpy(entry->last_pn,
1032 rx->key->u.ccmp.rx_pn[rx->queue],
1038 /* This is a fragment for a frame that should already be pending in
1039 * fragment cache. Add this fragment to the end of the pending entry.
1041 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1043 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1044 return RX_DROP_MONITOR;
1047 /* Verify that MPDUs within one MSDU have sequential PN values.
1048 * (IEEE 802.11i, 8.3.3.4.5) */
1051 u8 pn[CCMP_PN_LEN], *rpn;
1052 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1053 return RX_DROP_UNUSABLE;
1054 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1055 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1060 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1061 if (memcmp(pn, rpn, CCMP_PN_LEN))
1062 return RX_DROP_UNUSABLE;
1063 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1066 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1067 __skb_queue_tail(&entry->skb_list, rx->skb);
1068 entry->last_frag = frag;
1069 entry->extra_len += rx->skb->len;
1070 if (ieee80211_has_morefrags(fc)) {
1075 rx->skb = __skb_dequeue(&entry->skb_list);
1076 if (skb_tailroom(rx->skb) < entry->extra_len) {
1077 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1078 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1080 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1081 __skb_queue_purge(&entry->skb_list);
1082 return RX_DROP_UNUSABLE;
1085 while ((skb = __skb_dequeue(&entry->skb_list))) {
1086 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1090 /* Complete frame has been reassembled - process it now */
1091 rx->flags |= IEEE80211_RX_FRAGMENTED;
1095 rx->sta->rx_packets++;
1096 if (is_multicast_ether_addr(hdr->addr1))
1097 rx->local->dot11MulticastReceivedFrameCount++;
1099 ieee80211_led_rx(rx->local);
1103 static ieee80211_rx_result debug_noinline
1104 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1106 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1107 struct sk_buff *skb;
1108 int no_pending_pkts;
1109 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1111 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1112 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1115 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1116 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1117 return RX_DROP_UNUSABLE;
1119 skb = skb_dequeue(&rx->sta->tx_filtered);
1121 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1123 rx->local->total_ps_buffered--;
1125 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1126 skb_queue_empty(&rx->sta->ps_tx_buf);
1129 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1130 struct ieee80211_hdr *hdr =
1131 (struct ieee80211_hdr *) skb->data;
1134 * Tell TX path to send this frame even though the STA may
1135 * still remain is PS mode after this frame exchange.
1137 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
1139 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1140 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1141 rx->sta->sta.addr, rx->sta->sta.aid,
1142 skb_queue_len(&rx->sta->ps_tx_buf));
1143 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1145 /* Use MoreData flag to indicate whether there are more
1146 * buffered frames for this STA */
1147 if (no_pending_pkts)
1148 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1150 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1152 ieee80211_add_pending_skb(rx->local, skb);
1154 if (no_pending_pkts)
1155 sta_info_clear_tim_bit(rx->sta);
1156 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1157 } else if (!rx->sent_ps_buffered) {
1159 * FIXME: This can be the result of a race condition between
1160 * us expiring a frame and the station polling for it.
1161 * Should we send it a null-func frame indicating we
1162 * have nothing buffered for it?
1164 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1165 "though there are no buffered frames for it\n",
1166 rx->dev->name, rx->sta->sta.addr);
1167 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1170 /* Free PS Poll skb here instead of returning RX_DROP that would
1171 * count as an dropped frame. */
1172 dev_kfree_skb(rx->skb);
1177 static ieee80211_rx_result debug_noinline
1178 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1180 u8 *data = rx->skb->data;
1181 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1183 if (!ieee80211_is_data_qos(hdr->frame_control))
1186 /* remove the qos control field, update frame type and meta-data */
1187 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1188 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1189 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1190 /* change frame type to non QOS */
1191 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1197 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1199 if (unlikely(!rx->sta ||
1200 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1207 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1210 * Pass through unencrypted frames if the hardware has
1211 * decrypted them already.
1213 if (rx->status->flag & RX_FLAG_DECRYPTED)
1216 /* Drop unencrypted frames if key is set. */
1217 if (unlikely(!ieee80211_has_protected(fc) &&
1218 !ieee80211_is_nullfunc(fc) &&
1219 ieee80211_is_data(fc) &&
1220 (rx->key || rx->sdata->drop_unencrypted)))
1222 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1223 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1226 /* BIP does not use Protected field, so need to check MMIE */
1227 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1228 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1232 * When using MFP, Action frames are not allowed prior to
1233 * having configured keys.
1235 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1236 ieee80211_is_robust_mgmt_frame(
1237 (struct ieee80211_hdr *) rx->skb->data)))
1245 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1247 struct net_device *dev = rx->dev;
1248 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1250 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
1254 * requires that rx->skb is a frame with ethernet header
1256 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1258 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1259 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1260 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1263 * Allow EAPOL frames to us/the PAE group address regardless
1264 * of whether the frame was encrypted or not.
1266 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1267 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1268 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1271 if (ieee80211_802_1x_port_control(rx) ||
1272 ieee80211_drop_unencrypted(rx, fc))
1279 * requires that rx->skb is a frame with ethernet header
1282 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1284 struct net_device *dev = rx->dev;
1285 struct ieee80211_local *local = rx->local;
1286 struct sk_buff *skb, *xmit_skb;
1287 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1288 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1289 struct sta_info *dsta;
1294 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1295 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1296 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1297 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1298 if (is_multicast_ether_addr(ehdr->h_dest)) {
1300 * send multicast frames both to higher layers in
1301 * local net stack and back to the wireless medium
1303 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1304 if (!xmit_skb && net_ratelimit())
1305 printk(KERN_DEBUG "%s: failed to clone "
1306 "multicast frame\n", dev->name);
1308 dsta = sta_info_get(local, skb->data);
1309 if (dsta && dsta->sdata->dev == dev) {
1311 * The destination station is associated to
1312 * this AP (in this VLAN), so send the frame
1313 * directly to it and do not pass it to local
1323 int align __maybe_unused;
1325 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1327 * 'align' will only take the values 0 or 2 here
1328 * since all frames are required to be aligned
1329 * to 2-byte boundaries when being passed to
1330 * mac80211. That also explains the __skb_push()
1333 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1335 if (WARN_ON(skb_headroom(skb) < 3)) {
1339 u8 *data = skb->data;
1340 size_t len = skb->len;
1341 u8 *new = __skb_push(skb, align);
1342 memmove(new, data, len);
1343 __skb_trim(skb, len);
1349 /* deliver to local stack */
1350 skb->protocol = eth_type_trans(skb, dev);
1351 memset(skb->cb, 0, sizeof(skb->cb));
1357 /* send to wireless media */
1358 xmit_skb->protocol = htons(ETH_P_802_3);
1359 skb_reset_network_header(xmit_skb);
1360 skb_reset_mac_header(xmit_skb);
1361 dev_queue_xmit(xmit_skb);
1365 static ieee80211_rx_result debug_noinline
1366 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1368 struct net_device *dev = rx->dev;
1369 struct ieee80211_local *local = rx->local;
1372 struct sk_buff *skb = rx->skb, *frame = NULL;
1373 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1374 __le16 fc = hdr->frame_control;
1375 const struct ethhdr *eth;
1380 if (unlikely(!ieee80211_is_data(fc)))
1383 if (unlikely(!ieee80211_is_data_present(fc)))
1384 return RX_DROP_MONITOR;
1386 if (!(rx->flags & IEEE80211_RX_AMSDU))
1389 err = __ieee80211_data_to_8023(rx);
1391 return RX_DROP_UNUSABLE;
1395 dev->stats.rx_packets++;
1396 dev->stats.rx_bytes += skb->len;
1398 /* skip the wrapping header */
1399 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1401 return RX_DROP_UNUSABLE;
1403 while (skb != frame) {
1405 __be16 len = eth->h_proto;
1406 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1408 remaining = skb->len;
1409 memcpy(dst, eth->h_dest, ETH_ALEN);
1410 memcpy(src, eth->h_source, ETH_ALEN);
1412 padding = ((4 - subframe_len) & 0x3);
1413 /* the last MSDU has no padding */
1414 if (subframe_len > remaining)
1415 return RX_DROP_UNUSABLE;
1417 skb_pull(skb, sizeof(struct ethhdr));
1418 /* if last subframe reuse skb */
1419 if (remaining <= subframe_len + padding)
1423 * Allocate and reserve two bytes more for payload
1424 * alignment since sizeof(struct ethhdr) is 14.
1426 frame = dev_alloc_skb(
1427 ALIGN(local->hw.extra_tx_headroom, 4) +
1431 return RX_DROP_UNUSABLE;
1434 ALIGN(local->hw.extra_tx_headroom, 4) +
1435 sizeof(struct ethhdr) + 2);
1436 memcpy(skb_put(frame, ntohs(len)), skb->data,
1439 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1442 dev_kfree_skb(frame);
1443 return RX_DROP_UNUSABLE;
1447 skb_reset_network_header(frame);
1449 frame->priority = skb->priority;
1452 payload = frame->data;
1453 ethertype = (payload[6] << 8) | payload[7];
1455 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1456 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1457 compare_ether_addr(payload,
1458 bridge_tunnel_header) == 0)) {
1459 /* remove RFC1042 or Bridge-Tunnel
1460 * encapsulation and replace EtherType */
1462 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1463 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1465 memcpy(skb_push(frame, sizeof(__be16)),
1466 &len, sizeof(__be16));
1467 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1468 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1471 if (!ieee80211_frame_allowed(rx, fc)) {
1472 if (skb == frame) /* last frame */
1473 return RX_DROP_UNUSABLE;
1474 dev_kfree_skb(frame);
1478 ieee80211_deliver_skb(rx);
1484 #ifdef CONFIG_MAC80211_MESH
1485 static ieee80211_rx_result
1486 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1488 struct ieee80211_hdr *hdr;
1489 struct ieee80211s_hdr *mesh_hdr;
1490 unsigned int hdrlen;
1491 struct sk_buff *skb = rx->skb, *fwd_skb;
1492 struct ieee80211_local *local = rx->local;
1493 struct ieee80211_sub_if_data *sdata;
1495 hdr = (struct ieee80211_hdr *) skb->data;
1496 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1497 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1498 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1500 if (!ieee80211_is_data(hdr->frame_control))
1505 return RX_DROP_MONITOR;
1507 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1508 struct mesh_path *mppath;
1512 if (is_multicast_ether_addr(hdr->addr1)) {
1513 mpp_addr = hdr->addr3;
1514 proxied_addr = mesh_hdr->eaddr1;
1516 mpp_addr = hdr->addr4;
1517 proxied_addr = mesh_hdr->eaddr2;
1521 mppath = mpp_path_lookup(proxied_addr, sdata);
1523 mpp_path_add(proxied_addr, mpp_addr, sdata);
1525 spin_lock_bh(&mppath->state_lock);
1526 mppath->exp_time = jiffies;
1527 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1528 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1529 spin_unlock_bh(&mppath->state_lock);
1534 /* Frame has reached destination. Don't forward */
1535 if (!is_multicast_ether_addr(hdr->addr1) &&
1536 compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1541 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1543 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1544 dropped_frames_ttl);
1546 struct ieee80211_hdr *fwd_hdr;
1547 struct ieee80211_tx_info *info;
1549 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1551 if (!fwd_skb && net_ratelimit())
1552 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1555 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1556 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1557 info = IEEE80211_SKB_CB(fwd_skb);
1558 memset(info, 0, sizeof(*info));
1559 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1560 info->control.vif = &rx->sdata->vif;
1561 ieee80211_select_queue(local, fwd_skb);
1562 if (is_multicast_ether_addr(fwd_hdr->addr1))
1563 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1568 * Save TA to addr1 to send TA a path error if a
1569 * suitable next hop is not found
1571 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1573 err = mesh_nexthop_lookup(fwd_skb, sdata);
1574 /* Failed to immediately resolve next hop:
1575 * fwded frame was dropped or will be added
1576 * later to the pending skb queue. */
1578 return RX_DROP_MONITOR;
1580 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1583 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1585 ieee80211_add_pending_skb(local, fwd_skb);
1589 if (is_multicast_ether_addr(hdr->addr1) ||
1590 rx->dev->flags & IFF_PROMISC)
1593 return RX_DROP_MONITOR;
1597 static ieee80211_rx_result debug_noinline
1598 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1600 struct net_device *dev = rx->dev;
1601 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1602 __le16 fc = hdr->frame_control;
1605 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1608 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1609 return RX_DROP_MONITOR;
1611 err = __ieee80211_data_to_8023(rx);
1613 return RX_DROP_UNUSABLE;
1615 if (!ieee80211_frame_allowed(rx, fc))
1616 return RX_DROP_MONITOR;
1620 dev->stats.rx_packets++;
1621 dev->stats.rx_bytes += rx->skb->len;
1623 ieee80211_deliver_skb(rx);
1628 static ieee80211_rx_result debug_noinline
1629 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1631 struct ieee80211_local *local = rx->local;
1632 struct ieee80211_hw *hw = &local->hw;
1633 struct sk_buff *skb = rx->skb;
1634 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1635 struct tid_ampdu_rx *tid_agg_rx;
1639 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1642 if (ieee80211_is_back_req(bar->frame_control)) {
1645 tid = le16_to_cpu(bar->control) >> 12;
1646 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1647 != HT_AGG_STATE_OPERATIONAL)
1649 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1651 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1653 /* reset session timer */
1654 if (tid_agg_rx->timeout)
1655 mod_timer(&tid_agg_rx->session_timer,
1656 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1658 /* manage reordering buffer according to requested */
1659 /* sequence number */
1661 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1664 return RX_DROP_UNUSABLE;
1670 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1671 struct ieee80211_mgmt *mgmt,
1674 struct ieee80211_local *local = sdata->local;
1675 struct sk_buff *skb;
1676 struct ieee80211_mgmt *resp;
1678 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1679 /* Not to own unicast address */
1683 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1684 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1685 /* Not from the current AP or not associated yet. */
1689 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1690 /* Too short SA Query request frame */
1694 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1698 skb_reserve(skb, local->hw.extra_tx_headroom);
1699 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1700 memset(resp, 0, 24);
1701 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1702 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1703 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1704 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1705 IEEE80211_STYPE_ACTION);
1706 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1707 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1708 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1709 memcpy(resp->u.action.u.sa_query.trans_id,
1710 mgmt->u.action.u.sa_query.trans_id,
1711 WLAN_SA_QUERY_TR_ID_LEN);
1713 ieee80211_tx_skb(sdata, skb, 1);
1716 static ieee80211_rx_result debug_noinline
1717 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1719 struct ieee80211_local *local = rx->local;
1720 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1721 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1722 int len = rx->skb->len;
1724 if (!ieee80211_is_action(mgmt->frame_control))
1728 return RX_DROP_MONITOR;
1730 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1731 return RX_DROP_MONITOR;
1733 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1734 return RX_DROP_MONITOR;
1736 /* all categories we currently handle have action_code */
1737 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1738 return RX_DROP_MONITOR;
1740 switch (mgmt->u.action.category) {
1741 case WLAN_CATEGORY_BACK:
1743 * The aggregation code is not prepared to handle
1744 * anything but STA/AP due to the BSSID handling;
1745 * IBSS could work in the code but isn't supported
1746 * by drivers or the standard.
1748 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1749 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1750 sdata->vif.type != NL80211_IFTYPE_AP)
1751 return RX_DROP_MONITOR;
1753 switch (mgmt->u.action.u.addba_req.action_code) {
1754 case WLAN_ACTION_ADDBA_REQ:
1755 if (len < (IEEE80211_MIN_ACTION_SIZE +
1756 sizeof(mgmt->u.action.u.addba_req)))
1757 return RX_DROP_MONITOR;
1758 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1760 case WLAN_ACTION_ADDBA_RESP:
1761 if (len < (IEEE80211_MIN_ACTION_SIZE +
1762 sizeof(mgmt->u.action.u.addba_resp)))
1763 return RX_DROP_MONITOR;
1764 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1766 case WLAN_ACTION_DELBA:
1767 if (len < (IEEE80211_MIN_ACTION_SIZE +
1768 sizeof(mgmt->u.action.u.delba)))
1769 return RX_DROP_MONITOR;
1770 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1774 case WLAN_CATEGORY_SPECTRUM_MGMT:
1775 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1776 return RX_DROP_MONITOR;
1778 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1779 return RX_DROP_MONITOR;
1781 switch (mgmt->u.action.u.measurement.action_code) {
1782 case WLAN_ACTION_SPCT_MSR_REQ:
1783 if (len < (IEEE80211_MIN_ACTION_SIZE +
1784 sizeof(mgmt->u.action.u.measurement)))
1785 return RX_DROP_MONITOR;
1786 ieee80211_process_measurement_req(sdata, mgmt, len);
1788 case WLAN_ACTION_SPCT_CHL_SWITCH:
1789 if (len < (IEEE80211_MIN_ACTION_SIZE +
1790 sizeof(mgmt->u.action.u.chan_switch)))
1791 return RX_DROP_MONITOR;
1793 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1794 return RX_DROP_MONITOR;
1796 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1797 return RX_DROP_MONITOR;
1799 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1802 case WLAN_CATEGORY_SA_QUERY:
1803 if (len < (IEEE80211_MIN_ACTION_SIZE +
1804 sizeof(mgmt->u.action.u.sa_query)))
1805 return RX_DROP_MONITOR;
1806 switch (mgmt->u.action.u.sa_query.action) {
1807 case WLAN_ACTION_SA_QUERY_REQUEST:
1808 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1809 return RX_DROP_MONITOR;
1810 ieee80211_process_sa_query_req(sdata, mgmt, len);
1812 case WLAN_ACTION_SA_QUERY_RESPONSE:
1814 * SA Query response is currently only used in AP mode
1815 * and it is processed in user space.
1824 rx->sta->rx_packets++;
1825 dev_kfree_skb(rx->skb);
1829 static ieee80211_rx_result debug_noinline
1830 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1832 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1833 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1835 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1836 return RX_DROP_MONITOR;
1838 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1839 return RX_DROP_MONITOR;
1841 if (ieee80211_vif_is_mesh(&sdata->vif))
1842 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
1844 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
1845 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
1847 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1848 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1850 return RX_DROP_MONITOR;
1853 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
1854 struct ieee80211_rx_data *rx)
1857 unsigned int hdrlen;
1859 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1860 if (rx->skb->len >= hdrlen + 4)
1861 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1867 * Some hardware seem to generate incorrect Michael MIC
1868 * reports; ignore them to avoid triggering countermeasures.
1873 if (!ieee80211_has_protected(hdr->frame_control))
1876 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1878 * APs with pairwise keys should never receive Michael MIC
1879 * errors for non-zero keyidx because these are reserved for
1880 * group keys and only the AP is sending real multicast
1881 * frames in the BSS.
1886 if (!ieee80211_is_data(hdr->frame_control) &&
1887 !ieee80211_is_auth(hdr->frame_control))
1890 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1893 dev_kfree_skb(rx->skb);
1897 /* TODO: use IEEE80211_RX_FRAGMENTED */
1898 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1900 struct ieee80211_sub_if_data *sdata;
1901 struct ieee80211_local *local = rx->local;
1902 struct ieee80211_rtap_hdr {
1903 struct ieee80211_radiotap_header hdr;
1908 } __attribute__ ((packed)) *rthdr;
1909 struct sk_buff *skb = rx->skb, *skb2;
1910 struct net_device *prev_dev = NULL;
1911 struct ieee80211_rx_status *status = rx->status;
1913 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1916 if (skb_headroom(skb) < sizeof(*rthdr) &&
1917 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1920 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1921 memset(rthdr, 0, sizeof(*rthdr));
1922 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1923 rthdr->hdr.it_present =
1924 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1925 (1 << IEEE80211_RADIOTAP_RATE) |
1926 (1 << IEEE80211_RADIOTAP_CHANNEL));
1928 rthdr->rate = rx->rate->bitrate / 5;
1929 rthdr->chan_freq = cpu_to_le16(status->freq);
1931 if (status->band == IEEE80211_BAND_5GHZ)
1932 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1933 IEEE80211_CHAN_5GHZ);
1935 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1936 IEEE80211_CHAN_2GHZ);
1938 skb_set_mac_header(skb, 0);
1939 skb->ip_summed = CHECKSUM_UNNECESSARY;
1940 skb->pkt_type = PACKET_OTHERHOST;
1941 skb->protocol = htons(ETH_P_802_2);
1943 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1944 if (!netif_running(sdata->dev))
1947 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1948 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1952 skb2 = skb_clone(skb, GFP_ATOMIC);
1954 skb2->dev = prev_dev;
1959 prev_dev = sdata->dev;
1960 sdata->dev->stats.rx_packets++;
1961 sdata->dev->stats.rx_bytes += skb->len;
1965 skb->dev = prev_dev;
1971 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1979 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1980 struct ieee80211_rx_data *rx,
1981 struct sk_buff *skb)
1983 ieee80211_rx_result res = RX_DROP_MONITOR;
1987 rx->dev = sdata->dev;
1989 #define CALL_RXH(rxh) \
1992 if (res != RX_CONTINUE) \
1996 CALL_RXH(ieee80211_rx_h_passive_scan)
1997 CALL_RXH(ieee80211_rx_h_check)
1998 CALL_RXH(ieee80211_rx_h_decrypt)
1999 CALL_RXH(ieee80211_rx_h_check_more_data)
2000 CALL_RXH(ieee80211_rx_h_sta_process)
2001 CALL_RXH(ieee80211_rx_h_defragment)
2002 CALL_RXH(ieee80211_rx_h_ps_poll)
2003 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2004 /* must be after MMIC verify so header is counted in MPDU mic */
2005 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2006 CALL_RXH(ieee80211_rx_h_amsdu)
2007 #ifdef CONFIG_MAC80211_MESH
2008 if (ieee80211_vif_is_mesh(&sdata->vif))
2009 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2011 CALL_RXH(ieee80211_rx_h_data)
2012 CALL_RXH(ieee80211_rx_h_ctrl)
2013 CALL_RXH(ieee80211_rx_h_action)
2014 CALL_RXH(ieee80211_rx_h_mgmt)
2020 case RX_DROP_MONITOR:
2021 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2023 rx->sta->rx_dropped++;
2026 ieee80211_rx_cooked_monitor(rx);
2028 case RX_DROP_UNUSABLE:
2029 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2031 rx->sta->rx_dropped++;
2032 dev_kfree_skb(rx->skb);
2035 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2040 /* main receive path */
2042 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2043 struct ieee80211_rx_data *rx,
2044 struct ieee80211_hdr *hdr)
2046 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
2047 int multicast = is_multicast_ether_addr(hdr->addr1);
2049 switch (sdata->vif.type) {
2050 case NL80211_IFTYPE_STATION:
2054 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
2055 if (!(sdata->dev->flags & IFF_PROMISC))
2057 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2060 case NL80211_IFTYPE_ADHOC:
2063 if (ieee80211_is_beacon(hdr->frame_control)) {
2066 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2067 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2069 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2070 } else if (!multicast &&
2071 compare_ether_addr(sdata->dev->dev_addr,
2073 if (!(sdata->dev->flags & IFF_PROMISC))
2075 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2076 } else if (!rx->sta) {
2078 if (rx->status->flag & RX_FLAG_HT)
2079 rate_idx = 0; /* TODO: HT rates */
2081 rate_idx = rx->status->rate_idx;
2082 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2086 case NL80211_IFTYPE_MESH_POINT:
2088 compare_ether_addr(sdata->dev->dev_addr,
2090 if (!(sdata->dev->flags & IFF_PROMISC))
2093 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2096 case NL80211_IFTYPE_AP_VLAN:
2097 case NL80211_IFTYPE_AP:
2099 if (compare_ether_addr(sdata->dev->dev_addr,
2102 } else if (!ieee80211_bssid_match(bssid,
2103 sdata->dev->dev_addr)) {
2104 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2106 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2109 case NL80211_IFTYPE_WDS:
2110 if (bssid || !ieee80211_is_data(hdr->frame_control))
2112 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2115 case NL80211_IFTYPE_MONITOR:
2116 /* take everything */
2118 case NL80211_IFTYPE_UNSPECIFIED:
2119 case __NL80211_IFTYPE_AFTER_LAST:
2120 /* should never get here */
2129 * This is the actual Rx frames handler. as it blongs to Rx path it must
2130 * be called with rcu_read_lock protection.
2132 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2133 struct sk_buff *skb,
2134 struct ieee80211_rate *rate)
2136 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2137 struct ieee80211_local *local = hw_to_local(hw);
2138 struct ieee80211_sub_if_data *sdata;
2139 struct ieee80211_hdr *hdr;
2140 struct ieee80211_rx_data rx;
2142 struct ieee80211_sub_if_data *prev = NULL;
2143 struct sk_buff *skb_new;
2145 hdr = (struct ieee80211_hdr *)skb->data;
2146 memset(&rx, 0, sizeof(rx));
2153 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2154 local->dot11ReceivedFragmentCount++;
2156 rx.sta = sta_info_get(local, hdr->addr2);
2158 rx.sdata = rx.sta->sdata;
2159 rx.dev = rx.sta->sdata->dev;
2162 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
2163 ieee80211_rx_michael_mic_report(hdr, &rx);
2167 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2168 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2169 rx.flags |= IEEE80211_RX_IN_SCAN;
2171 ieee80211_parse_qos(&rx);
2172 ieee80211_verify_alignment(&rx);
2176 if (rx.sdata && ieee80211_is_data(hdr->frame_control)) {
2177 rx.flags |= IEEE80211_RX_RA_MATCH;
2178 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2181 } else list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2182 if (!netif_running(sdata->dev))
2185 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2186 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2189 rx.flags |= IEEE80211_RX_RA_MATCH;
2190 prepares = prepare_for_handlers(sdata, &rx, hdr);
2196 * frame is destined for this interface, but if it's not
2197 * also for the previous one we handle that after the
2198 * loop to avoid copying the SKB once too much
2207 * frame was destined for the previous interface
2208 * so invoke RX handlers for it
2211 skb_new = skb_copy(skb, GFP_ATOMIC);
2213 if (net_ratelimit())
2214 printk(KERN_DEBUG "%s: failed to copy "
2215 "multicast frame for %s\n",
2216 wiphy_name(local->hw.wiphy),
2220 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2224 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2229 #define SEQ_MODULO 0x1000
2230 #define SEQ_MASK 0xfff
2232 static inline int seq_less(u16 sq1, u16 sq2)
2234 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2237 static inline u16 seq_inc(u16 sq)
2239 return (sq + 1) & SEQ_MASK;
2242 static inline u16 seq_sub(u16 sq1, u16 sq2)
2244 return (sq1 - sq2) & SEQ_MASK;
2248 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2249 struct tid_ampdu_rx *tid_agg_rx,
2252 struct ieee80211_supported_band *sband;
2253 struct ieee80211_rate *rate;
2254 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2255 struct ieee80211_rx_status *status;
2260 status = IEEE80211_SKB_RXCB(skb);
2262 /* release the reordered frames to stack */
2263 sband = hw->wiphy->bands[status->band];
2264 if (status->flag & RX_FLAG_HT)
2265 rate = sband->bitrates; /* TODO: HT rates */
2267 rate = &sband->bitrates[status->rate_idx];
2268 __ieee80211_rx_handle_packet(hw, skb, rate);
2269 tid_agg_rx->stored_mpdu_num--;
2270 tid_agg_rx->reorder_buf[index] = NULL;
2273 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2278 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2279 * the skb was added to the buffer longer than this time ago, the earlier
2280 * frames that have not yet been received are assumed to be lost and the skb
2281 * can be released for processing. This may also release other skb's from the
2282 * reorder buffer if there are no additional gaps between the frames.
2284 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2287 * As it function blongs to Rx path it must be called with
2288 * the proper rcu_read_lock protection for its flow.
2290 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2291 struct tid_ampdu_rx *tid_agg_rx,
2292 struct sk_buff *skb,
2296 u16 head_seq_num, buf_size;
2299 buf_size = tid_agg_rx->buf_size;
2300 head_seq_num = tid_agg_rx->head_seq_num;
2302 /* frame with out of date sequence number */
2303 if (seq_less(mpdu_seq_num, head_seq_num)) {
2308 /* if frame sequence number exceeds our buffering window size or
2309 * block Ack Request arrived - release stored frames */
2310 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2311 /* new head to the ordering buffer */
2313 head_seq_num = mpdu_seq_num;
2316 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2317 /* release stored frames up to new head to stack */
2318 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2319 index = seq_sub(tid_agg_rx->head_seq_num,
2321 % tid_agg_rx->buf_size;
2322 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2329 /* now the new frame is always in the range of the reordering */
2331 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2332 % tid_agg_rx->buf_size;
2333 /* check if we already stored this frame */
2334 if (tid_agg_rx->reorder_buf[index]) {
2339 /* if arrived mpdu is in the right order and nothing else stored */
2340 /* release it immediately */
2341 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2342 tid_agg_rx->stored_mpdu_num == 0) {
2343 tid_agg_rx->head_seq_num =
2344 seq_inc(tid_agg_rx->head_seq_num);
2348 /* put the frame in the reordering buffer */
2349 tid_agg_rx->reorder_buf[index] = skb;
2350 tid_agg_rx->reorder_time[index] = jiffies;
2351 tid_agg_rx->stored_mpdu_num++;
2352 /* release the buffer until next missing frame */
2353 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2354 % tid_agg_rx->buf_size;
2355 if (!tid_agg_rx->reorder_buf[index] &&
2356 tid_agg_rx->stored_mpdu_num > 1) {
2358 * No buffers ready to be released, but check whether any
2359 * frames in the reorder buffer have timed out.
2363 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2364 j = (j + 1) % tid_agg_rx->buf_size) {
2365 if (tid_agg_rx->reorder_buf[j] == NULL) {
2369 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2373 #ifdef CONFIG_MAC80211_HT_DEBUG
2374 if (net_ratelimit())
2375 printk(KERN_DEBUG "%s: release an RX reorder "
2376 "frame due to timeout on earlier "
2378 wiphy_name(hw->wiphy));
2380 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2383 * Increment the head seq# also for the skipped slots.
2385 tid_agg_rx->head_seq_num =
2386 (tid_agg_rx->head_seq_num + skipped) &
2390 } else while (tid_agg_rx->reorder_buf[index]) {
2391 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
2392 index = seq_sub(tid_agg_rx->head_seq_num,
2393 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2398 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2399 struct sk_buff *skb)
2401 struct ieee80211_hw *hw = &local->hw;
2402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2403 struct sta_info *sta;
2404 struct tid_ampdu_rx *tid_agg_rx;
2410 sta = sta_info_get(local, hdr->addr2);
2414 /* filter the QoS data rx stream according to
2415 * STA/TID and check if this STA/TID is on aggregation */
2416 if (!ieee80211_is_data_qos(hdr->frame_control))
2419 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2421 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2424 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2426 /* qos null data frames are excluded */
2427 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2430 /* new un-ordered ampdu frame - process it */
2432 /* reset session timer */
2433 if (tid_agg_rx->timeout)
2434 mod_timer(&tid_agg_rx->session_timer,
2435 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2437 /* if this mpdu is fragmented - terminate rx aggregation session */
2438 sc = le16_to_cpu(hdr->seq_ctrl);
2439 if (sc & IEEE80211_SCTL_FRAG) {
2440 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2441 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2446 /* according to mpdu sequence number deal with reordering buffer */
2447 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2448 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2455 * This is the receive path handler. It is called by a low level driver when an
2456 * 802.11 MPDU is received from the hardware.
2458 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2460 struct ieee80211_local *local = hw_to_local(hw);
2461 struct ieee80211_rate *rate = NULL;
2462 struct ieee80211_supported_band *sband;
2463 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2465 WARN_ON_ONCE(softirq_count() == 0);
2467 if (WARN_ON(status->band < 0 ||
2468 status->band >= IEEE80211_NUM_BANDS))
2471 sband = local->hw.wiphy->bands[status->band];
2472 if (WARN_ON(!sband))
2476 * If we're suspending, it is possible although not too likely
2477 * that we'd be receiving frames after having already partially
2478 * quiesced the stack. We can't process such frames then since
2479 * that might, for example, cause stations to be added or other
2480 * driver callbacks be invoked.
2482 if (unlikely(local->quiescing || local->suspended))
2486 * The same happens when we're not even started,
2487 * but that's worth a warning.
2489 if (WARN_ON(!local->started))
2492 if (status->flag & RX_FLAG_HT) {
2493 /* rate_idx is MCS index */
2494 if (WARN_ON(status->rate_idx < 0 ||
2495 status->rate_idx >= 76))
2497 /* HT rates are not in the table - use the highest legacy rate
2498 * for now since other parts of mac80211 may not yet be fully
2500 rate = &sband->bitrates[sband->n_bitrates - 1];
2502 if (WARN_ON(status->rate_idx < 0 ||
2503 status->rate_idx >= sband->n_bitrates))
2505 rate = &sband->bitrates[status->rate_idx];
2509 * key references and virtual interfaces are protected using RCU
2510 * and this requires that we are in a read-side RCU section during
2511 * receive processing
2516 * Frames with failed FCS/PLCP checksum are not returned,
2517 * all other frames are returned without radiotap header
2518 * if it was previously present.
2519 * Also, frames with less than 16 bytes are dropped.
2521 skb = ieee80211_rx_monitor(local, skb, rate);
2528 * In theory, the block ack reordering should happen after duplicate
2529 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2530 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2531 * happen as a new RX handler between ieee80211_rx_h_check and
2532 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2533 * the time being, the call can be here since RX reorder buf processing
2534 * will implicitly skip duplicates. We could, in theory at least,
2535 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2536 * frames from other than operational channel), but that should not
2537 * happen in normal networks.
2539 if (!ieee80211_rx_reorder_ampdu(local, skb))
2540 __ieee80211_rx_handle_packet(hw, skb, rate);
2548 EXPORT_SYMBOL(ieee80211_rx);
2550 /* This is a version of the rx handler that can be called from hard irq
2551 * context. Post the skb on the queue and schedule the tasklet */
2552 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2554 struct ieee80211_local *local = hw_to_local(hw);
2556 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2558 skb->pkt_type = IEEE80211_RX_MSG;
2559 skb_queue_tail(&local->skb_queue, skb);
2560 tasklet_schedule(&local->tasklet);
2562 EXPORT_SYMBOL(ieee80211_rx_irqsafe);