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"
29 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
30 struct tid_ampdu_rx *tid_agg_rx,
31 struct sk_buff *skb, u16 mpdu_seq_num,
34 * monitor mode reception
36 * This function cleans up the SKB, i.e. it removes all the stuff
37 * only useful for monitoring.
39 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
43 skb_pull(skb, rtap_len);
45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
47 skb_trim(skb, skb->len - FCS_LEN);
59 static inline int should_drop_frame(struct ieee80211_rx_status *status,
64 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
66 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
68 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
70 if (ieee80211_is_ctl(hdr->frame_control) &&
71 !ieee80211_is_pspoll(hdr->frame_control) &&
72 !ieee80211_is_back_req(hdr->frame_control))
78 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
79 struct ieee80211_rx_status *status)
83 /* always present fields */
84 len = sizeof(struct ieee80211_radiotap_header) + 9;
86 if (status->flag & RX_FLAG_TSFT)
88 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB ||
89 local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
91 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
94 if (len & 1) /* padding for RX_FLAGS if necessary */
97 /* make sure radiotap starts at a naturally aligned address */
99 len = roundup(len, 8);
105 * ieee80211_add_rx_radiotap_header - add radiotap header
107 * add a radiotap header containing all the fields which the hardware provided.
110 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
112 struct ieee80211_rx_status *status,
113 struct ieee80211_rate *rate,
116 struct ieee80211_radiotap_header *rthdr;
119 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
120 memset(rthdr, 0, rtap_len);
122 /* radiotap header, set always present flags */
124 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
125 (1 << IEEE80211_RADIOTAP_RATE) |
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;
148 /* IEEE80211_RADIOTAP_RATE */
149 *pos = rate->bitrate / 5;
152 /* IEEE80211_RADIOTAP_CHANNEL */
153 *(__le16 *)pos = cpu_to_le16(status->freq);
155 if (status->band == IEEE80211_BAND_5GHZ)
156 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
157 IEEE80211_CHAN_5GHZ);
159 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN |
160 IEEE80211_CHAN_2GHZ);
163 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
164 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
165 *pos = status->signal;
167 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
171 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
172 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
173 *pos = status->noise;
175 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
179 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
181 /* IEEE80211_RADIOTAP_ANTENNA */
182 *pos = status->antenna;
185 /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
186 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
187 *pos = status->signal;
189 cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
193 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
195 /* IEEE80211_RADIOTAP_RX_FLAGS */
196 /* ensure 2 byte alignment for the 2 byte field as required */
197 if ((pos - (unsigned char *)rthdr) & 1)
199 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
200 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
201 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
206 * This function copies a received frame to all monitor interfaces and
207 * returns a cleaned-up SKB that no longer includes the FCS nor the
208 * radiotap header the driver might have added.
210 static struct sk_buff *
211 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
212 struct ieee80211_rx_status *status,
213 struct ieee80211_rate *rate)
215 struct ieee80211_sub_if_data *sdata;
216 int needed_headroom = 0;
217 struct sk_buff *skb, *skb2;
218 struct net_device *prev_dev = NULL;
219 int present_fcs_len = 0;
223 * First, we may need to make a copy of the skb because
224 * (1) we need to modify it for radiotap (if not present), and
225 * (2) the other RX handlers will modify the skb we got.
227 * We don't need to, of course, if we aren't going to return
228 * the SKB because it has a bad FCS/PLCP checksum.
230 if (status->flag & RX_FLAG_RADIOTAP)
231 rtap_len = ieee80211_get_radiotap_len(origskb->data);
233 /* room for the radiotap header based on driver features */
234 needed_headroom = ieee80211_rx_radiotap_len(local, status);
236 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
237 present_fcs_len = FCS_LEN;
239 if (!local->monitors) {
240 if (should_drop_frame(status, origskb, present_fcs_len,
242 dev_kfree_skb(origskb);
246 return remove_monitor_info(local, origskb, rtap_len);
249 if (should_drop_frame(status, origskb, present_fcs_len, rtap_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, rtap_len);
279 /* if necessary, prepend radiotap information */
280 if (!(status->flag & RX_FLAG_RADIOTAP))
281 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
284 skb_reset_mac_header(skb);
285 skb->ip_summed = CHECKSUM_UNNECESSARY;
286 skb->pkt_type = PACKET_OTHERHOST;
287 skb->protocol = htons(ETH_P_802_2);
289 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
290 if (!netif_running(sdata->dev))
293 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
296 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
300 skb2 = skb_clone(skb, GFP_ATOMIC);
302 skb2->dev = prev_dev;
307 prev_dev = sdata->dev;
308 sdata->dev->stats.rx_packets++;
309 sdata->dev->stats.rx_bytes += skb->len;
322 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
324 u8 *data = rx->skb->data;
327 /* does the frame have a qos control field? */
328 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
329 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
330 /* frame has qos control */
331 tid = qc[0] & QOS_CONTROL_TID_MASK;
332 if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
333 rx->flags |= IEEE80211_RX_AMSDU;
335 rx->flags &= ~IEEE80211_RX_AMSDU;
337 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
338 /* Separate TID for management frames */
339 tid = NUM_RX_DATA_QUEUES - 1;
341 /* no qos control present */
342 tid = 0; /* 802.1d - Best Effort */
347 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
348 * For now, set skb->priority to 0 for other cases. */
349 rx->skb->priority = (tid > 7) ? 0 : tid;
352 static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
354 #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
357 if (!WLAN_FC_DATA_PRESENT(rx->fc))
361 * Drivers are required to align the payload data in a way that
362 * guarantees that the contained IP header is aligned to a four-
363 * byte boundary. In the case of regular frames, this simply means
364 * aligning the payload to a four-byte boundary (because either
365 * the IP header is directly contained, or IV/RFC1042 headers that
366 * have a length divisible by four are in front of it.
368 * With A-MSDU frames, however, the payload data address must
369 * yield two modulo four because there are 14-byte 802.3 headers
370 * within the A-MSDU frames that push the IP header further back
371 * to a multiple of four again. Thankfully, the specs were sane
372 * enough this time around to require padding each A-MSDU subframe
373 * to a length that is a multiple of four.
375 * Padding like atheros hardware adds which is inbetween the 802.11
376 * header and the payload is not supported, the driver is required
377 * to move the 802.11 header further back in that case.
379 hdrlen = ieee80211_get_hdrlen(rx->fc);
380 if (rx->flags & IEEE80211_RX_AMSDU)
382 WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
389 static ieee80211_rx_result debug_noinline
390 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
392 struct ieee80211_local *local = rx->local;
393 struct sk_buff *skb = rx->skb;
395 if (unlikely(local->sta_hw_scanning))
396 return ieee80211_sta_rx_scan(rx->dev, skb, rx->status);
398 if (unlikely(local->sta_sw_scanning)) {
399 /* drop all the other packets during a software scan anyway */
400 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status)
406 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
407 /* scanning finished during invoking of handlers */
408 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
409 return RX_DROP_UNUSABLE;
415 static ieee80211_rx_result
416 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
418 int hdrlen = ieee80211_get_hdrlen(rx->fc);
419 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
421 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
423 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) {
424 if (!((rx->fc & IEEE80211_FCTL_FROMDS) &&
425 (rx->fc & IEEE80211_FCTL_TODS)))
426 return RX_DROP_MONITOR;
427 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
428 return RX_DROP_MONITOR;
431 /* If there is not an established peer link and this is not a peer link
432 * establisment frame, beacon or probe, drop the frame.
435 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
436 struct ieee80211_mgmt *mgmt;
438 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
439 return RX_DROP_MONITOR;
441 switch (rx->fc & IEEE80211_FCTL_STYPE) {
442 case IEEE80211_STYPE_ACTION:
443 mgmt = (struct ieee80211_mgmt *)hdr;
444 if (mgmt->u.action.category != PLINK_CATEGORY)
445 return RX_DROP_MONITOR;
446 /* fall through on else */
447 case IEEE80211_STYPE_PROBE_REQ:
448 case IEEE80211_STYPE_PROBE_RESP:
449 case IEEE80211_STYPE_BEACON:
453 return RX_DROP_MONITOR;
456 } else if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
457 is_multicast_ether_addr(hdr->addr1) &&
458 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev))
459 return RX_DROP_MONITOR;
466 static ieee80211_rx_result debug_noinline
467 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
469 struct ieee80211_hdr *hdr;
471 hdr = (struct ieee80211_hdr *) rx->skb->data;
473 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
474 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
475 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
476 rx->sta->last_seq_ctrl[rx->queue] ==
478 if (rx->flags & IEEE80211_RX_RA_MATCH) {
479 rx->local->dot11FrameDuplicateCount++;
480 rx->sta->num_duplicates++;
482 return RX_DROP_MONITOR;
484 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
487 if (unlikely(rx->skb->len < 16)) {
488 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
489 return RX_DROP_MONITOR;
492 /* Drop disallowed frame classes based on STA auth/assoc state;
493 * IEEE 802.11, Chap 5.5.
495 * 80211.o does filtering only based on association state, i.e., it
496 * drops Class 3 frames from not associated stations. hostapd sends
497 * deauth/disassoc frames when needed. In addition, hostapd is
498 * responsible for filtering on both auth and assoc states.
501 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
502 return ieee80211_rx_mesh_check(rx);
504 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
505 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
506 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
507 rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
508 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
509 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
510 !(rx->fc & IEEE80211_FCTL_TODS) &&
511 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
512 || !(rx->flags & IEEE80211_RX_RA_MATCH)) {
513 /* Drop IBSS frames and frames for other hosts
515 return RX_DROP_MONITOR;
518 return RX_DROP_MONITOR;
525 static ieee80211_rx_result debug_noinline
526 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
528 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
531 ieee80211_rx_result result = RX_DROP_UNUSABLE;
532 struct ieee80211_key *stakey = NULL;
537 * There are three types of keys:
539 * - PTK (pairwise keys)
540 * - STK (station-to-station pairwise keys)
542 * When selecting a key, we have to distinguish between multicast
543 * (including broadcast) and unicast frames, the latter can only
544 * use PTKs and STKs while the former always use GTKs. Unless, of
545 * course, actual WEP keys ("pre-RSNA") are used, then unicast
546 * frames can also use key indizes like GTKs. Hence, if we don't
547 * have a PTK/STK we check the key index for a WEP key.
549 * Note that in a regular BSS, multicast frames are sent by the
550 * AP only, associated stations unicast the frame to the AP first
551 * which then multicasts it on their behalf.
553 * There is also a slight problem in IBSS mode: GTKs are negotiated
554 * with each station, that is something we don't currently handle.
555 * The spec seems to expect that one negotiates the same key with
556 * every station but there's no such requirement; VLANs could be
560 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
564 * No point in finding a key and decrypting if the frame is neither
565 * addressed to us nor a multicast frame.
567 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
571 stakey = rcu_dereference(rx->sta->key);
573 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
577 * The device doesn't give us the IV so we won't be
578 * able to look up the key. That's ok though, we
579 * don't need to decrypt the frame, we just won't
580 * be able to keep statistics accurate.
581 * Except for key threshold notifications, should
582 * we somehow allow the driver to tell us which key
583 * the hardware used if this flag is set?
585 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
586 (rx->status->flag & RX_FLAG_IV_STRIPPED))
589 hdrlen = ieee80211_get_hdrlen(rx->fc);
591 if (rx->skb->len < 8 + hdrlen)
592 return RX_DROP_UNUSABLE; /* TODO: count this? */
595 * no need to call ieee80211_wep_get_keyidx,
596 * it verifies a bunch of things we've done already
598 keyidx = rx->skb->data[hdrlen + 3] >> 6;
600 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
603 * RSNA-protected unicast frames should always be sent with
604 * pairwise or station-to-station keys, but for WEP we allow
605 * using a key index as well.
607 if (rx->key && rx->key->conf.alg != ALG_WEP &&
608 !is_multicast_ether_addr(hdr->addr1))
613 rx->key->tx_rx_count++;
614 /* TODO: add threshold stuff again */
616 return RX_DROP_MONITOR;
619 /* Check for weak IVs if possible */
620 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
621 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
622 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
623 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
624 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
625 rx->sta->wep_weak_iv_count++;
627 switch (rx->key->conf.alg) {
629 result = ieee80211_crypto_wep_decrypt(rx);
632 result = ieee80211_crypto_tkip_decrypt(rx);
635 result = ieee80211_crypto_ccmp_decrypt(rx);
639 /* either the frame has been decrypted or will be dropped */
640 rx->status->flag |= RX_FLAG_DECRYPTED;
645 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
647 struct ieee80211_sub_if_data *sdata;
648 DECLARE_MAC_BUF(mac);
653 atomic_inc(&sdata->bss->num_sta_ps);
654 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
655 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
656 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
657 dev->name, print_mac(mac, sta->addr), sta->aid);
658 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
661 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
663 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
666 struct ieee80211_sub_if_data *sdata;
667 struct ieee80211_tx_info *info;
668 DECLARE_MAC_BUF(mac);
673 atomic_dec(&sdata->bss->num_sta_ps);
675 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
677 if (!skb_queue_empty(&sta->ps_tx_buf))
678 sta_info_clear_tim_bit(sta);
680 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
681 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
682 dev->name, print_mac(mac, sta->addr), sta->aid);
683 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
685 /* Send all buffered frames to the station */
686 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
687 info = IEEE80211_SKB_CB(skb);
689 info->flags |= IEEE80211_TX_CTL_REQUEUE;
692 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
693 info = IEEE80211_SKB_CB(skb);
694 local->total_ps_buffered--;
696 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
697 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
698 "since STA not sleeping anymore\n", dev->name,
699 print_mac(mac, sta->addr), sta->aid);
700 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
701 info->flags |= IEEE80211_TX_CTL_REQUEUE;
708 static ieee80211_rx_result debug_noinline
709 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
711 struct sta_info *sta = rx->sta;
712 struct net_device *dev = rx->dev;
713 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
718 /* Update last_rx only for IBSS packets which are for the current
719 * BSSID to avoid keeping the current IBSS network alive in cases where
720 * other STAs are using different BSSID. */
721 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
722 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
723 IEEE80211_IF_TYPE_IBSS);
724 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
725 sta->last_rx = jiffies;
727 if (!is_multicast_ether_addr(hdr->addr1) ||
728 rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
729 /* Update last_rx only for unicast frames in order to prevent
730 * the Probe Request frames (the only broadcast frames from a
731 * STA in infrastructure mode) from keeping a connection alive.
732 * Mesh beacons will update last_rx when if they are found to
733 * match the current local configuration when processed.
735 sta->last_rx = jiffies;
738 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
742 sta->rx_bytes += rx->skb->len;
743 sta->last_signal = rx->status->signal;
744 sta->last_qual = rx->status->qual;
745 sta->last_noise = rx->status->noise;
747 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
748 /* Change STA power saving mode only in the end of a frame
749 * exchange sequence */
750 if (test_sta_flags(sta, WLAN_STA_PS) &&
751 !(rx->fc & IEEE80211_FCTL_PM))
752 rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
753 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
754 (rx->fc & IEEE80211_FCTL_PM))
755 ap_sta_ps_start(dev, sta);
758 /* Drop data::nullfunc frames silently, since they are used only to
759 * control station power saving mode. */
760 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
761 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
762 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
763 /* Update counter and free packet here to avoid counting this
764 * as a dropped packed. */
766 dev_kfree_skb(rx->skb);
771 } /* ieee80211_rx_h_sta_process */
773 static inline struct ieee80211_fragment_entry *
774 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
775 unsigned int frag, unsigned int seq, int rx_queue,
776 struct sk_buff **skb)
778 struct ieee80211_fragment_entry *entry;
781 idx = sdata->fragment_next;
782 entry = &sdata->fragments[sdata->fragment_next++];
783 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
784 sdata->fragment_next = 0;
786 if (!skb_queue_empty(&entry->skb_list)) {
787 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
788 struct ieee80211_hdr *hdr =
789 (struct ieee80211_hdr *) entry->skb_list.next->data;
790 DECLARE_MAC_BUF(mac);
791 DECLARE_MAC_BUF(mac2);
792 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
793 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
794 "addr1=%s addr2=%s\n",
795 sdata->dev->name, idx,
796 jiffies - entry->first_frag_time, entry->seq,
797 entry->last_frag, print_mac(mac, hdr->addr1),
798 print_mac(mac2, hdr->addr2));
800 __skb_queue_purge(&entry->skb_list);
803 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
805 entry->first_frag_time = jiffies;
807 entry->rx_queue = rx_queue;
808 entry->last_frag = frag;
810 entry->extra_len = 0;
815 static inline struct ieee80211_fragment_entry *
816 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
817 u16 fc, unsigned int frag, unsigned int seq,
818 int rx_queue, struct ieee80211_hdr *hdr)
820 struct ieee80211_fragment_entry *entry;
823 idx = sdata->fragment_next;
824 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
825 struct ieee80211_hdr *f_hdr;
830 idx = IEEE80211_FRAGMENT_MAX - 1;
832 entry = &sdata->fragments[idx];
833 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
834 entry->rx_queue != rx_queue ||
835 entry->last_frag + 1 != frag)
838 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
839 f_fc = le16_to_cpu(f_hdr->frame_control);
841 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
842 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
843 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
846 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
847 __skb_queue_purge(&entry->skb_list);
856 static ieee80211_rx_result debug_noinline
857 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
859 struct ieee80211_hdr *hdr;
861 unsigned int frag, seq;
862 struct ieee80211_fragment_entry *entry;
864 DECLARE_MAC_BUF(mac);
866 hdr = (struct ieee80211_hdr *) rx->skb->data;
867 sc = le16_to_cpu(hdr->seq_ctrl);
868 frag = sc & IEEE80211_SCTL_FRAG;
870 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
871 (rx->skb)->len < 24 ||
872 is_multicast_ether_addr(hdr->addr1))) {
876 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
878 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
881 /* This is the first fragment of a new frame. */
882 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
883 rx->queue, &(rx->skb));
884 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
885 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
886 /* Store CCMP PN so that we can verify that the next
887 * fragment has a sequential PN value. */
889 memcpy(entry->last_pn,
890 rx->key->u.ccmp.rx_pn[rx->queue],
896 /* This is a fragment for a frame that should already be pending in
897 * fragment cache. Add this fragment to the end of the pending entry.
899 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
902 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
903 return RX_DROP_MONITOR;
906 /* Verify that MPDUs within one MSDU have sequential PN values.
907 * (IEEE 802.11i, 8.3.3.4.5) */
910 u8 pn[CCMP_PN_LEN], *rpn;
911 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
912 return RX_DROP_UNUSABLE;
913 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
914 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
919 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
920 if (memcmp(pn, rpn, CCMP_PN_LEN))
921 return RX_DROP_UNUSABLE;
922 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
925 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
926 __skb_queue_tail(&entry->skb_list, rx->skb);
927 entry->last_frag = frag;
928 entry->extra_len += rx->skb->len;
929 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
934 rx->skb = __skb_dequeue(&entry->skb_list);
935 if (skb_tailroom(rx->skb) < entry->extra_len) {
936 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
937 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
939 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
940 __skb_queue_purge(&entry->skb_list);
941 return RX_DROP_UNUSABLE;
944 while ((skb = __skb_dequeue(&entry->skb_list))) {
945 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
949 /* Complete frame has been reassembled - process it now */
950 rx->flags |= IEEE80211_RX_FRAGMENTED;
954 rx->sta->rx_packets++;
955 if (is_multicast_ether_addr(hdr->addr1))
956 rx->local->dot11MulticastReceivedFrameCount++;
958 ieee80211_led_rx(rx->local);
962 static ieee80211_rx_result debug_noinline
963 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
965 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
968 DECLARE_MAC_BUF(mac);
970 if (likely(!rx->sta ||
971 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
972 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
973 !(rx->flags & IEEE80211_RX_RA_MATCH)))
976 if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
977 (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
978 return RX_DROP_UNUSABLE;
980 skb = skb_dequeue(&rx->sta->tx_filtered);
982 skb = skb_dequeue(&rx->sta->ps_tx_buf);
984 rx->local->total_ps_buffered--;
986 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
987 skb_queue_empty(&rx->sta->ps_tx_buf);
990 struct ieee80211_hdr *hdr =
991 (struct ieee80211_hdr *) skb->data;
994 * Tell TX path to send one frame even though the STA may
995 * still remain is PS mode after this frame exchange.
997 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
999 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1000 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
1001 print_mac(mac, rx->sta->addr), rx->sta->aid,
1002 skb_queue_len(&rx->sta->ps_tx_buf));
1003 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1005 /* Use MoreData flag to indicate whether there are more
1006 * buffered frames for this STA */
1007 if (no_pending_pkts)
1008 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1010 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1012 dev_queue_xmit(skb);
1014 if (no_pending_pkts)
1015 sta_info_clear_tim_bit(rx->sta);
1016 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1017 } else if (!rx->sent_ps_buffered) {
1019 * FIXME: This can be the result of a race condition between
1020 * us expiring a frame and the station polling for it.
1021 * Should we send it a null-func frame indicating we
1022 * have nothing buffered for it?
1024 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
1025 "though there are no buffered frames for it\n",
1026 rx->dev->name, print_mac(mac, rx->sta->addr));
1027 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1030 /* Free PS Poll skb here instead of returning RX_DROP that would
1031 * count as an dropped frame. */
1032 dev_kfree_skb(rx->skb);
1037 static ieee80211_rx_result debug_noinline
1038 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1041 u8 *data = rx->skb->data;
1042 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
1044 if (!WLAN_FC_IS_QOS_DATA(fc))
1047 /* remove the qos control field, update frame type and meta-data */
1048 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
1049 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
1050 /* change frame type to non QOS */
1051 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
1052 hdr->frame_control = cpu_to_le16(fc);
1058 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1060 if (unlikely(!rx->sta ||
1061 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1068 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx)
1071 * Pass through unencrypted frames if the hardware has
1072 * decrypted them already.
1074 if (rx->status->flag & RX_FLAG_DECRYPTED)
1077 /* Drop unencrypted frames if key is set. */
1078 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1079 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1080 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1081 (rx->key || rx->sdata->drop_unencrypted)))
1088 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1090 struct net_device *dev = rx->dev;
1091 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1092 u16 fc, hdrlen, ethertype;
1095 u8 src[ETH_ALEN] __aligned(2);
1096 struct sk_buff *skb = rx->skb;
1097 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1098 DECLARE_MAC_BUF(mac);
1099 DECLARE_MAC_BUF(mac2);
1100 DECLARE_MAC_BUF(mac3);
1101 DECLARE_MAC_BUF(mac4);
1105 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1108 hdrlen = ieee80211_get_hdrlen(fc);
1110 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1111 int meshhdrlen = ieee80211_get_mesh_hdrlen(
1112 (struct ieee80211s_hdr *) (skb->data + hdrlen));
1114 * - mesh header: to be used for mesh forwarding
1115 * decision. It will also be used as mesh header template at
1116 * tx.c:ieee80211_subif_start_xmit() if interface
1117 * type is mesh and skb->pkt_type == PACKET_OTHERHOST
1118 * - ta: to be used if a RERR needs to be sent.
1120 memcpy(skb->cb, skb->data + hdrlen, meshhdrlen);
1121 memcpy(MESH_PREQ(skb), hdr->addr2, ETH_ALEN);
1122 hdrlen += meshhdrlen;
1125 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1127 * IEEE 802.11 address fields:
1128 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1129 * 0 0 DA SA BSSID n/a
1130 * 0 1 DA BSSID SA n/a
1131 * 1 0 BSSID SA DA n/a
1135 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1136 case IEEE80211_FCTL_TODS:
1138 memcpy(dst, hdr->addr3, ETH_ALEN);
1139 memcpy(src, hdr->addr2, ETH_ALEN);
1141 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
1142 sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
1145 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1147 memcpy(dst, hdr->addr3, ETH_ALEN);
1148 memcpy(src, hdr->addr4, ETH_ALEN);
1150 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
1151 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
1154 case IEEE80211_FCTL_FROMDS:
1156 memcpy(dst, hdr->addr1, ETH_ALEN);
1157 memcpy(src, hdr->addr3, ETH_ALEN);
1159 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
1160 (is_multicast_ether_addr(dst) &&
1161 !compare_ether_addr(src, dev->dev_addr)))
1166 memcpy(dst, hdr->addr1, ETH_ALEN);
1167 memcpy(src, hdr->addr2, ETH_ALEN);
1169 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1174 if (unlikely(skb->len - hdrlen < 8))
1177 payload = skb->data + hdrlen;
1178 ethertype = (payload[6] << 8) | payload[7];
1180 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1181 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1182 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1183 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1184 * replace EtherType */
1185 skb_pull(skb, hdrlen + 6);
1186 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1187 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1189 struct ethhdr *ehdr;
1192 skb_pull(skb, hdrlen);
1193 len = htons(skb->len);
1194 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1195 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1196 memcpy(ehdr->h_source, src, ETH_ALEN);
1197 ehdr->h_proto = len;
1203 * requires that rx->skb is a frame with ethernet header
1205 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx)
1207 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1208 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1209 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1212 * Allow EAPOL frames to us/the PAE group address regardless
1213 * of whether the frame was encrypted or not.
1215 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1216 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1217 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1220 if (ieee80211_802_1x_port_control(rx) ||
1221 ieee80211_drop_unencrypted(rx))
1228 * requires that rx->skb is a frame with ethernet header
1231 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1233 struct net_device *dev = rx->dev;
1234 struct ieee80211_local *local = rx->local;
1235 struct sk_buff *skb, *xmit_skb;
1236 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1237 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1238 struct sta_info *dsta;
1243 if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1244 sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
1245 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1246 if (is_multicast_ether_addr(ehdr->h_dest)) {
1248 * send multicast frames both to higher layers in
1249 * local net stack and back to the wireless medium
1251 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1252 if (!xmit_skb && net_ratelimit())
1253 printk(KERN_DEBUG "%s: failed to clone "
1254 "multicast frame\n", dev->name);
1256 dsta = sta_info_get(local, skb->data);
1257 if (dsta && dsta->sdata->dev == dev) {
1259 * The destination station is associated to
1260 * this AP (in this VLAN), so send the frame
1261 * directly to it and do not pass it to local
1270 /* Mesh forwarding */
1271 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1272 u8 *mesh_ttl = &((struct ieee80211s_hdr *)skb->cb)->ttl;
1275 if (is_multicast_ether_addr(skb->data)) {
1276 if (*mesh_ttl > 0) {
1277 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1279 xmit_skb->pkt_type = PACKET_OTHERHOST;
1280 else if (net_ratelimit())
1281 printk(KERN_DEBUG "%s: failed to clone "
1282 "multicast frame\n", dev->name);
1284 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
1285 dropped_frames_ttl);
1286 } else if (skb->pkt_type != PACKET_OTHERHOST &&
1287 compare_ether_addr(dev->dev_addr, skb->data) != 0) {
1288 if (*mesh_ttl == 0) {
1289 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
1290 dropped_frames_ttl);
1295 xmit_skb->pkt_type = PACKET_OTHERHOST;
1296 if (!(dev->flags & IFF_PROMISC))
1303 /* deliver to local stack */
1304 skb->protocol = eth_type_trans(skb, dev);
1305 memset(skb->cb, 0, sizeof(skb->cb));
1310 /* send to wireless media */
1311 xmit_skb->protocol = htons(ETH_P_802_3);
1312 skb_reset_network_header(xmit_skb);
1313 skb_reset_mac_header(xmit_skb);
1314 dev_queue_xmit(xmit_skb);
1318 static ieee80211_rx_result debug_noinline
1319 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1321 struct net_device *dev = rx->dev;
1322 struct ieee80211_local *local = rx->local;
1325 struct sk_buff *skb = rx->skb, *frame = NULL;
1326 const struct ethhdr *eth;
1330 DECLARE_MAC_BUF(mac);
1333 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1336 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1337 return RX_DROP_MONITOR;
1339 if (!(rx->flags & IEEE80211_RX_AMSDU))
1342 err = ieee80211_data_to_8023(rx);
1344 return RX_DROP_UNUSABLE;
1348 dev->stats.rx_packets++;
1349 dev->stats.rx_bytes += skb->len;
1351 /* skip the wrapping header */
1352 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1354 return RX_DROP_UNUSABLE;
1356 while (skb != frame) {
1358 __be16 len = eth->h_proto;
1359 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1361 remaining = skb->len;
1362 memcpy(dst, eth->h_dest, ETH_ALEN);
1363 memcpy(src, eth->h_source, ETH_ALEN);
1365 padding = ((4 - subframe_len) & 0x3);
1366 /* the last MSDU has no padding */
1367 if (subframe_len > remaining)
1368 return RX_DROP_UNUSABLE;
1370 skb_pull(skb, sizeof(struct ethhdr));
1371 /* if last subframe reuse skb */
1372 if (remaining <= subframe_len + padding)
1375 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1379 return RX_DROP_UNUSABLE;
1381 skb_reserve(frame, local->hw.extra_tx_headroom +
1382 sizeof(struct ethhdr));
1383 memcpy(skb_put(frame, ntohs(len)), skb->data,
1386 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1389 dev_kfree_skb(frame);
1390 return RX_DROP_UNUSABLE;
1394 skb_reset_network_header(frame);
1396 frame->priority = skb->priority;
1399 payload = frame->data;
1400 ethertype = (payload[6] << 8) | payload[7];
1402 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1403 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1404 compare_ether_addr(payload,
1405 bridge_tunnel_header) == 0)) {
1406 /* remove RFC1042 or Bridge-Tunnel
1407 * encapsulation and replace EtherType */
1409 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1410 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1412 memcpy(skb_push(frame, sizeof(__be16)),
1413 &len, sizeof(__be16));
1414 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1415 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1418 if (!ieee80211_frame_allowed(rx)) {
1419 if (skb == frame) /* last frame */
1420 return RX_DROP_UNUSABLE;
1421 dev_kfree_skb(frame);
1425 ieee80211_deliver_skb(rx);
1431 static ieee80211_rx_result debug_noinline
1432 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1434 struct net_device *dev = rx->dev;
1439 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1442 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1443 return RX_DROP_MONITOR;
1445 err = ieee80211_data_to_8023(rx);
1447 return RX_DROP_UNUSABLE;
1449 if (!ieee80211_frame_allowed(rx))
1450 return RX_DROP_MONITOR;
1454 dev->stats.rx_packets++;
1455 dev->stats.rx_bytes += rx->skb->len;
1457 ieee80211_deliver_skb(rx);
1462 static ieee80211_rx_result debug_noinline
1463 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1465 struct ieee80211_local *local = rx->local;
1466 struct ieee80211_hw *hw = &local->hw;
1467 struct sk_buff *skb = rx->skb;
1468 struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data;
1469 struct tid_ampdu_rx *tid_agg_rx;
1473 if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL))
1476 if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) {
1479 tid = le16_to_cpu(bar->control) >> 12;
1480 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1481 != HT_AGG_STATE_OPERATIONAL)
1483 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1485 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1487 /* reset session timer */
1488 if (tid_agg_rx->timeout) {
1489 unsigned long expires =
1490 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1491 mod_timer(&tid_agg_rx->session_timer, expires);
1494 /* manage reordering buffer according to requested */
1495 /* sequence number */
1497 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1500 return RX_DROP_UNUSABLE;
1506 static ieee80211_rx_result debug_noinline
1507 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1509 struct ieee80211_sub_if_data *sdata;
1511 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1512 return RX_DROP_MONITOR;
1514 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1515 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1516 sdata->vif.type == IEEE80211_IF_TYPE_IBSS ||
1517 sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) &&
1518 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1519 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status);
1521 return RX_DROP_MONITOR;
1526 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1527 struct ieee80211_hdr *hdr,
1528 struct ieee80211_rx_data *rx)
1531 DECLARE_MAC_BUF(mac);
1532 DECLARE_MAC_BUF(mac2);
1534 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1535 if (rx->skb->len >= hdrlen + 4)
1536 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1542 * Some hardware seem to generate incorrect Michael MIC
1543 * reports; ignore them to avoid triggering countermeasures.
1548 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
1551 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
1553 * APs with pairwise keys should never receive Michael MIC
1554 * errors for non-zero keyidx because these are reserved for
1555 * group keys and only the AP is sending real multicast
1556 * frames in the BSS.
1561 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1562 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1563 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH))
1566 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1568 dev_kfree_skb(rx->skb);
1572 /* TODO: use IEEE80211_RX_FRAGMENTED */
1573 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1575 struct ieee80211_sub_if_data *sdata;
1576 struct ieee80211_local *local = rx->local;
1577 struct ieee80211_rtap_hdr {
1578 struct ieee80211_radiotap_header hdr;
1583 } __attribute__ ((packed)) *rthdr;
1584 struct sk_buff *skb = rx->skb, *skb2;
1585 struct net_device *prev_dev = NULL;
1586 struct ieee80211_rx_status *status = rx->status;
1588 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1591 if (skb_headroom(skb) < sizeof(*rthdr) &&
1592 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1595 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1596 memset(rthdr, 0, sizeof(*rthdr));
1597 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1598 rthdr->hdr.it_present =
1599 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1600 (1 << IEEE80211_RADIOTAP_RATE) |
1601 (1 << IEEE80211_RADIOTAP_CHANNEL));
1603 rthdr->rate = rx->rate->bitrate / 5;
1604 rthdr->chan_freq = cpu_to_le16(status->freq);
1606 if (status->band == IEEE80211_BAND_5GHZ)
1607 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1608 IEEE80211_CHAN_5GHZ);
1610 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1611 IEEE80211_CHAN_2GHZ);
1613 skb_set_mac_header(skb, 0);
1614 skb->ip_summed = CHECKSUM_UNNECESSARY;
1615 skb->pkt_type = PACKET_OTHERHOST;
1616 skb->protocol = htons(ETH_P_802_2);
1618 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1619 if (!netif_running(sdata->dev))
1622 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
1623 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1627 skb2 = skb_clone(skb, GFP_ATOMIC);
1629 skb2->dev = prev_dev;
1634 prev_dev = sdata->dev;
1635 sdata->dev->stats.rx_packets++;
1636 sdata->dev->stats.rx_bytes += skb->len;
1640 skb->dev = prev_dev;
1646 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1654 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1655 struct ieee80211_rx_data *rx,
1656 struct sk_buff *skb)
1658 ieee80211_rx_result res = RX_DROP_MONITOR;
1662 rx->dev = sdata->dev;
1664 #define CALL_RXH(rxh) \
1666 if (res != RX_CONTINUE) \
1669 CALL_RXH(ieee80211_rx_h_passive_scan)
1670 CALL_RXH(ieee80211_rx_h_check)
1671 CALL_RXH(ieee80211_rx_h_decrypt)
1672 CALL_RXH(ieee80211_rx_h_sta_process)
1673 CALL_RXH(ieee80211_rx_h_defragment)
1674 CALL_RXH(ieee80211_rx_h_ps_poll)
1675 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1676 /* must be after MMIC verify so header is counted in MPDU mic */
1677 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1678 CALL_RXH(ieee80211_rx_h_amsdu)
1679 CALL_RXH(ieee80211_rx_h_data)
1680 CALL_RXH(ieee80211_rx_h_ctrl)
1681 CALL_RXH(ieee80211_rx_h_mgmt)
1687 case RX_DROP_MONITOR:
1688 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1690 rx->sta->rx_dropped++;
1693 ieee80211_rx_cooked_monitor(rx);
1695 case RX_DROP_UNUSABLE:
1696 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1698 rx->sta->rx_dropped++;
1699 dev_kfree_skb(rx->skb);
1702 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1707 /* main receive path */
1709 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1710 u8 *bssid, struct ieee80211_rx_data *rx,
1711 struct ieee80211_hdr *hdr)
1713 int multicast = is_multicast_ether_addr(hdr->addr1);
1715 switch (sdata->vif.type) {
1716 case IEEE80211_IF_TYPE_STA:
1719 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1720 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1722 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1723 } else if (!multicast &&
1724 compare_ether_addr(sdata->dev->dev_addr,
1726 if (!(sdata->dev->flags & IFF_PROMISC))
1728 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1731 case IEEE80211_IF_TYPE_IBSS:
1734 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
1735 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
1737 rx->sta = ieee80211_ibss_add_sta(sdata->dev,
1738 rx->skb, bssid, hdr->addr2,
1739 BIT(rx->status->rate_idx));
1742 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1743 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1745 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1746 } else if (!multicast &&
1747 compare_ether_addr(sdata->dev->dev_addr,
1749 if (!(sdata->dev->flags & IFF_PROMISC))
1751 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1752 } else if (!rx->sta)
1753 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1755 BIT(rx->status->rate_idx));
1757 case IEEE80211_IF_TYPE_MESH_POINT:
1759 compare_ether_addr(sdata->dev->dev_addr,
1761 if (!(sdata->dev->flags & IFF_PROMISC))
1764 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1767 case IEEE80211_IF_TYPE_VLAN:
1768 case IEEE80211_IF_TYPE_AP:
1770 if (compare_ether_addr(sdata->dev->dev_addr,
1773 } else if (!ieee80211_bssid_match(bssid,
1774 sdata->dev->dev_addr)) {
1775 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1777 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1779 if (sdata->dev == sdata->local->mdev &&
1780 !(rx->flags & IEEE80211_RX_IN_SCAN))
1781 /* do not receive anything via
1782 * master device when not scanning */
1785 case IEEE80211_IF_TYPE_WDS:
1787 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1789 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1792 case IEEE80211_IF_TYPE_MNTR:
1793 /* take everything */
1795 case IEEE80211_IF_TYPE_INVALID:
1796 /* should never get here */
1805 * This is the actual Rx frames handler. as it blongs to Rx path it must
1806 * be called with rcu_read_lock protection.
1808 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1809 struct sk_buff *skb,
1810 struct ieee80211_rx_status *status,
1811 struct ieee80211_rate *rate)
1813 struct ieee80211_local *local = hw_to_local(hw);
1814 struct ieee80211_sub_if_data *sdata;
1815 struct ieee80211_hdr *hdr;
1816 struct ieee80211_rx_data rx;
1819 struct ieee80211_sub_if_data *prev = NULL;
1820 struct sk_buff *skb_new;
1823 hdr = (struct ieee80211_hdr *) skb->data;
1824 memset(&rx, 0, sizeof(rx));
1830 rx.fc = le16_to_cpu(hdr->frame_control);
1831 type = rx.fc & IEEE80211_FCTL_FTYPE;
1833 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1834 local->dot11ReceivedFragmentCount++;
1836 rx.sta = sta_info_get(local, hdr->addr2);
1838 rx.sdata = rx.sta->sdata;
1839 rx.dev = rx.sta->sdata->dev;
1842 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1843 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1847 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1848 rx.flags |= IEEE80211_RX_IN_SCAN;
1850 ieee80211_parse_qos(&rx);
1851 ieee80211_verify_ip_alignment(&rx);
1855 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1856 if (!netif_running(sdata->dev))
1859 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
1862 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1863 rx.flags |= IEEE80211_RX_RA_MATCH;
1864 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1870 * frame is destined for this interface, but if it's not
1871 * also for the previous one we handle that after the
1872 * loop to avoid copying the SKB once too much
1881 * frame was destined for the previous interface
1882 * so invoke RX handlers for it
1885 skb_new = skb_copy(skb, GFP_ATOMIC);
1887 if (net_ratelimit())
1888 printk(KERN_DEBUG "%s: failed to copy "
1889 "multicast frame for %s\n",
1890 wiphy_name(local->hw.wiphy),
1894 rx.fc = le16_to_cpu(hdr->frame_control);
1895 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
1899 rx.fc = le16_to_cpu(hdr->frame_control);
1900 ieee80211_invoke_rx_handlers(prev, &rx, skb);
1905 #define SEQ_MODULO 0x1000
1906 #define SEQ_MASK 0xfff
1908 static inline int seq_less(u16 sq1, u16 sq2)
1910 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1913 static inline u16 seq_inc(u16 sq)
1915 return ((sq + 1) & SEQ_MASK);
1918 static inline u16 seq_sub(u16 sq1, u16 sq2)
1920 return ((sq1 - sq2) & SEQ_MASK);
1925 * As it function blongs to Rx path it must be called with
1926 * the proper rcu_read_lock protection for its flow.
1928 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
1929 struct tid_ampdu_rx *tid_agg_rx,
1930 struct sk_buff *skb, u16 mpdu_seq_num,
1933 struct ieee80211_local *local = hw_to_local(hw);
1934 struct ieee80211_rx_status status;
1935 u16 head_seq_num, buf_size;
1937 struct ieee80211_supported_band *sband;
1938 struct ieee80211_rate *rate;
1940 buf_size = tid_agg_rx->buf_size;
1941 head_seq_num = tid_agg_rx->head_seq_num;
1943 /* frame with out of date sequence number */
1944 if (seq_less(mpdu_seq_num, head_seq_num)) {
1949 /* if frame sequence number exceeds our buffering window size or
1950 * block Ack Request arrived - release stored frames */
1951 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
1952 /* new head to the ordering buffer */
1954 head_seq_num = mpdu_seq_num;
1957 seq_inc(seq_sub(mpdu_seq_num, buf_size));
1958 /* release stored frames up to new head to stack */
1959 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1960 index = seq_sub(tid_agg_rx->head_seq_num,
1962 % tid_agg_rx->buf_size;
1964 if (tid_agg_rx->reorder_buf[index]) {
1965 /* release the reordered frames to stack */
1967 tid_agg_rx->reorder_buf[index]->cb,
1969 sband = local->hw.wiphy->bands[status.band];
1970 rate = &sband->bitrates[status.rate_idx];
1971 __ieee80211_rx_handle_packet(hw,
1972 tid_agg_rx->reorder_buf[index],
1974 tid_agg_rx->stored_mpdu_num--;
1975 tid_agg_rx->reorder_buf[index] = NULL;
1977 tid_agg_rx->head_seq_num =
1978 seq_inc(tid_agg_rx->head_seq_num);
1984 /* now the new frame is always in the range of the reordering */
1986 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
1987 % tid_agg_rx->buf_size;
1988 /* check if we already stored this frame */
1989 if (tid_agg_rx->reorder_buf[index]) {
1994 /* if arrived mpdu is in the right order and nothing else stored */
1995 /* release it immediately */
1996 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1997 tid_agg_rx->stored_mpdu_num == 0) {
1998 tid_agg_rx->head_seq_num =
1999 seq_inc(tid_agg_rx->head_seq_num);
2003 /* put the frame in the reordering buffer */
2004 tid_agg_rx->reorder_buf[index] = skb;
2005 tid_agg_rx->stored_mpdu_num++;
2006 /* release the buffer until next missing frame */
2007 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2008 % tid_agg_rx->buf_size;
2009 while (tid_agg_rx->reorder_buf[index]) {
2010 /* release the reordered frame back to stack */
2011 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2013 sband = local->hw.wiphy->bands[status.band];
2014 rate = &sband->bitrates[status.rate_idx];
2015 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2017 tid_agg_rx->stored_mpdu_num--;
2018 tid_agg_rx->reorder_buf[index] = NULL;
2019 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2020 index = seq_sub(tid_agg_rx->head_seq_num,
2021 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2026 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2027 struct sk_buff *skb)
2029 struct ieee80211_hw *hw = &local->hw;
2030 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2031 struct sta_info *sta;
2032 struct tid_ampdu_rx *tid_agg_rx;
2038 sta = sta_info_get(local, hdr->addr2);
2042 /* filter the QoS data rx stream according to
2043 * STA/TID and check if this STA/TID is on aggregation */
2044 if (!ieee80211_is_data_qos(hdr->frame_control))
2047 tid = *ieee80211_get_qos_ctl(hdr) & QOS_CONTROL_TID_MASK;
2049 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2052 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2054 /* null data frames are excluded */
2055 if (unlikely(ieee80211_is_nullfunc(hdr->frame_control)))
2058 /* new un-ordered ampdu frame - process it */
2060 /* reset session timer */
2061 if (tid_agg_rx->timeout) {
2062 unsigned long expires =
2063 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2064 mod_timer(&tid_agg_rx->session_timer, expires);
2067 /* if this mpdu is fragmented - terminate rx aggregation session */
2068 sc = le16_to_cpu(hdr->seq_ctrl);
2069 if (sc & IEEE80211_SCTL_FRAG) {
2070 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
2071 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2076 /* according to mpdu sequence number deal with reordering buffer */
2077 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2078 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2085 * This is the receive path handler. It is called by a low level driver when an
2086 * 802.11 MPDU is received from the hardware.
2088 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2089 struct ieee80211_rx_status *status)
2091 struct ieee80211_local *local = hw_to_local(hw);
2092 struct ieee80211_rate *rate = NULL;
2093 struct ieee80211_supported_band *sband;
2095 if (status->band < 0 ||
2096 status->band >= IEEE80211_NUM_BANDS) {
2101 sband = local->hw.wiphy->bands[status->band];
2104 status->rate_idx < 0 ||
2105 status->rate_idx >= sband->n_bitrates) {
2110 rate = &sband->bitrates[status->rate_idx];
2113 * key references and virtual interfaces are protected using RCU
2114 * and this requires that we are in a read-side RCU section during
2115 * receive processing
2120 * Frames with failed FCS/PLCP checksum are not returned,
2121 * all other frames are returned without radiotap header
2122 * if it was previously present.
2123 * Also, frames with less than 16 bytes are dropped.
2125 skb = ieee80211_rx_monitor(local, skb, status, rate);
2131 if (!ieee80211_rx_reorder_ampdu(local, skb))
2132 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2136 EXPORT_SYMBOL(__ieee80211_rx);
2138 /* This is a version of the rx handler that can be called from hard irq
2139 * context. Post the skb on the queue and schedule the tasklet */
2140 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2141 struct ieee80211_rx_status *status)
2143 struct ieee80211_local *local = hw_to_local(hw);
2145 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2147 skb->dev = local->mdev;
2148 /* copy status into skb->cb for use by tasklet */
2149 memcpy(skb->cb, status, sizeof(*status));
2150 skb->pkt_type = IEEE80211_RX_MSG;
2151 skb_queue_tail(&local->skb_queue, skb);
2152 tasklet_schedule(&local->tasklet);
2154 EXPORT_SYMBOL(ieee80211_rx_irqsafe);