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 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
30 struct tid_ampdu_rx *tid_agg_rx,
35 * monitor mode reception
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
44 skb_pull(skb, rtap_len);
46 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
47 if (likely(skb->len > FCS_LEN))
48 skb_trim(skb, skb->len - FCS_LEN);
60 static inline int should_drop_frame(struct ieee80211_rx_status *status,
65 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
67 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
69 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
71 if (ieee80211_is_ctl(hdr->frame_control) &&
72 !ieee80211_is_pspoll(hdr->frame_control) &&
73 !ieee80211_is_back_req(hdr->frame_control))
79 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
80 struct ieee80211_rx_status *status)
84 /* always present fields */
85 len = sizeof(struct ieee80211_radiotap_header) + 9;
87 if (status->flag & RX_FLAG_TSFT)
89 if (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_CHANNEL) |
126 (1 << IEEE80211_RADIOTAP_ANTENNA) |
127 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
128 rthdr->it_len = cpu_to_le16(rtap_len);
130 pos = (unsigned char *)(rthdr+1);
132 /* the order of the following fields is important */
134 /* IEEE80211_RADIOTAP_TSFT */
135 if (status->flag & RX_FLAG_TSFT) {
136 *(__le64 *)pos = cpu_to_le64(status->mactime);
138 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
142 /* IEEE80211_RADIOTAP_FLAGS */
143 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
144 *pos |= IEEE80211_RADIOTAP_F_FCS;
145 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
146 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
147 if (status->flag & RX_FLAG_SHORTPRE)
148 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
151 /* IEEE80211_RADIOTAP_RATE */
152 if (status->flag & RX_FLAG_HT) {
154 * TODO: add following information into radiotap header once
155 * suitable fields are defined for it:
156 * - MCS index (status->rate_idx)
157 * - HT40 (status->flag & RX_FLAG_40MHZ)
158 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
162 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
163 *pos = rate->bitrate / 5;
167 /* IEEE80211_RADIOTAP_CHANNEL */
168 *(__le16 *)pos = cpu_to_le16(status->freq);
170 if (status->band == IEEE80211_BAND_5GHZ)
171 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
172 IEEE80211_CHAN_5GHZ);
173 else if (rate->flags & IEEE80211_RATE_ERP_G)
174 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
175 IEEE80211_CHAN_2GHZ);
177 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
178 IEEE80211_CHAN_2GHZ);
181 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
182 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
183 *pos = status->signal;
185 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
189 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
190 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
191 *pos = status->noise;
193 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
197 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
199 /* IEEE80211_RADIOTAP_ANTENNA */
200 *pos = status->antenna;
203 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
205 /* IEEE80211_RADIOTAP_RX_FLAGS */
206 /* ensure 2 byte alignment for the 2 byte field as required */
207 if ((pos - (unsigned char *)rthdr) & 1)
209 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
210 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP);
215 * This function copies a received frame to all monitor interfaces and
216 * returns a cleaned-up SKB that no longer includes the FCS nor the
217 * radiotap header the driver might have added.
219 static struct sk_buff *
220 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
221 struct ieee80211_rx_status *status,
222 struct ieee80211_rate *rate)
224 struct ieee80211_sub_if_data *sdata;
225 int needed_headroom = 0;
226 struct sk_buff *skb, *skb2;
227 struct net_device *prev_dev = NULL;
228 int present_fcs_len = 0;
232 * First, we may need to make a copy of the skb because
233 * (1) we need to modify it for radiotap (if not present), and
234 * (2) the other RX handlers will modify the skb we got.
236 * We don't need to, of course, if we aren't going to return
237 * the SKB because it has a bad FCS/PLCP checksum.
239 if (status->flag & RX_FLAG_RADIOTAP)
240 rtap_len = ieee80211_get_radiotap_len(origskb->data);
242 /* room for the radiotap header based on driver features */
243 needed_headroom = ieee80211_rx_radiotap_len(local, status);
245 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
246 present_fcs_len = FCS_LEN;
248 if (!local->monitors) {
249 if (should_drop_frame(status, origskb, present_fcs_len,
251 dev_kfree_skb(origskb);
255 return remove_monitor_info(local, origskb, rtap_len);
258 if (should_drop_frame(status, 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, status, 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(local->hw_scanning))
422 return ieee80211_scan_rx(rx->sdata, skb, rx->status);
424 if (unlikely(local->sw_scanning)) {
425 /* drop all the other packets during a software scan anyway */
426 if (ieee80211_scan_rx(rx->sdata, skb, rx->status)
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);
493 if (ieee80211_is_data(hdr->frame_control)) {
494 if (!ieee80211_has_a4(hdr->frame_control))
495 return RX_DROP_MONITOR;
496 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
497 return RX_DROP_MONITOR;
500 /* If there is not an established peer link and this is not a peer link
501 * establisment frame, beacon or probe, drop the frame.
504 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
505 struct ieee80211_mgmt *mgmt;
507 if (!ieee80211_is_mgmt(hdr->frame_control))
508 return RX_DROP_MONITOR;
510 if (ieee80211_is_action(hdr->frame_control)) {
511 mgmt = (struct ieee80211_mgmt *)hdr;
512 if (mgmt->u.action.category != PLINK_CATEGORY)
513 return RX_DROP_MONITOR;
517 if (ieee80211_is_probe_req(hdr->frame_control) ||
518 ieee80211_is_probe_resp(hdr->frame_control) ||
519 ieee80211_is_beacon(hdr->frame_control))
522 return RX_DROP_MONITOR;
526 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
528 if (ieee80211_is_data(hdr->frame_control) &&
529 is_multicast_ether_addr(hdr->addr1) &&
530 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
531 return RX_DROP_MONITOR;
538 static ieee80211_rx_result debug_noinline
539 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
541 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
543 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
544 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
545 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
546 rx->sta->last_seq_ctrl[rx->queue] ==
548 if (rx->flags & IEEE80211_RX_RA_MATCH) {
549 rx->local->dot11FrameDuplicateCount++;
550 rx->sta->num_duplicates++;
552 return RX_DROP_MONITOR;
554 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
557 if (unlikely(rx->skb->len < 16)) {
558 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
559 return RX_DROP_MONITOR;
562 /* Drop disallowed frame classes based on STA auth/assoc state;
563 * IEEE 802.11, Chap 5.5.
565 * mac80211 filters only based on association state, i.e. it drops
566 * Class 3 frames from not associated stations. hostapd sends
567 * deauth/disassoc frames when needed. In addition, hostapd is
568 * responsible for filtering on both auth and assoc states.
571 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
572 return ieee80211_rx_mesh_check(rx);
574 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
575 ieee80211_is_pspoll(hdr->frame_control)) &&
576 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
577 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
578 if ((!ieee80211_has_fromds(hdr->frame_control) &&
579 !ieee80211_has_tods(hdr->frame_control) &&
580 ieee80211_is_data(hdr->frame_control)) ||
581 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
582 /* Drop IBSS frames and frames for other hosts
584 return RX_DROP_MONITOR;
587 return RX_DROP_MONITOR;
594 static ieee80211_rx_result debug_noinline
595 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
597 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
600 ieee80211_rx_result result = RX_DROP_UNUSABLE;
601 struct ieee80211_key *stakey = NULL;
602 int mmie_keyidx = -1;
607 * There are four types of keys:
609 * - IGTK (group keys for management frames)
610 * - PTK (pairwise keys)
611 * - STK (station-to-station pairwise keys)
613 * When selecting a key, we have to distinguish between multicast
614 * (including broadcast) and unicast frames, the latter can only
615 * use PTKs and STKs while the former always use GTKs and IGTKs.
616 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
617 * unicast frames can also use key indices like GTKs. Hence, if we
618 * don't have a PTK/STK we check the key index for a WEP key.
620 * Note that in a regular BSS, multicast frames are sent by the
621 * AP only, associated stations unicast the frame to the AP first
622 * which then multicasts it on their behalf.
624 * There is also a slight problem in IBSS mode: GTKs are negotiated
625 * with each station, that is something we don't currently handle.
626 * The spec seems to expect that one negotiates the same key with
627 * every station but there's no such requirement; VLANs could be
631 if (!ieee80211_has_protected(hdr->frame_control)) {
632 if (!ieee80211_is_mgmt(hdr->frame_control) ||
633 rx->sta == NULL || !test_sta_flags(rx->sta, WLAN_STA_MFP))
635 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
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 (!is_multicast_ether_addr(hdr->addr1) && stakey) {
652 } else if (mmie_keyidx >= 0) {
653 /* Broadcast/multicast robust management frame / BIP */
654 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
655 (rx->status->flag & RX_FLAG_IV_STRIPPED))
658 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
659 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
660 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
661 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
664 * The device doesn't give us the IV so we won't be
665 * able to look up the key. That's ok though, we
666 * don't need to decrypt the frame, we just won't
667 * be able to keep statistics accurate.
668 * Except for key threshold notifications, should
669 * we somehow allow the driver to tell us which key
670 * the hardware used if this flag is set?
672 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
673 (rx->status->flag & RX_FLAG_IV_STRIPPED))
676 hdrlen = ieee80211_hdrlen(hdr->frame_control);
678 if (rx->skb->len < 8 + hdrlen)
679 return RX_DROP_UNUSABLE; /* TODO: count this? */
682 * no need to call ieee80211_wep_get_keyidx,
683 * it verifies a bunch of things we've done already
685 keyidx = rx->skb->data[hdrlen + 3] >> 6;
687 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
690 * RSNA-protected unicast frames should always be sent with
691 * pairwise or station-to-station keys, but for WEP we allow
692 * using a key index as well.
694 if (rx->key && rx->key->conf.alg != ALG_WEP &&
695 !is_multicast_ether_addr(hdr->addr1))
700 rx->key->tx_rx_count++;
701 /* TODO: add threshold stuff again */
703 return RX_DROP_MONITOR;
706 /* Check for weak IVs if possible */
707 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
708 ieee80211_is_data(hdr->frame_control) &&
709 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
710 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
711 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
712 rx->sta->wep_weak_iv_count++;
714 switch (rx->key->conf.alg) {
716 result = ieee80211_crypto_wep_decrypt(rx);
719 result = ieee80211_crypto_tkip_decrypt(rx);
722 result = ieee80211_crypto_ccmp_decrypt(rx);
725 result = ieee80211_crypto_aes_cmac_decrypt(rx);
729 /* either the frame has been decrypted or will be dropped */
730 rx->status->flag |= RX_FLAG_DECRYPTED;
735 static ieee80211_rx_result debug_noinline
736 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
738 struct ieee80211_local *local;
739 struct ieee80211_hdr *hdr;
744 hdr = (struct ieee80211_hdr *) skb->data;
746 if (!local->pspolling)
749 if (!ieee80211_has_fromds(hdr->frame_control))
750 /* this is not from AP */
753 if (!ieee80211_is_data(hdr->frame_control))
756 if (!ieee80211_has_moredata(hdr->frame_control)) {
757 /* AP has no more frames buffered for us */
758 local->pspolling = false;
762 /* more data bit is set, let's request a new frame from the AP */
763 ieee80211_send_pspoll(local, rx->sdata);
768 static void ap_sta_ps_start(struct sta_info *sta)
770 struct ieee80211_sub_if_data *sdata = sta->sdata;
771 struct ieee80211_local *local = sdata->local;
773 atomic_inc(&sdata->bss->num_sta_ps);
774 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
775 if (local->ops->sta_notify)
776 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
777 STA_NOTIFY_SLEEP, &sta->sta);
778 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
779 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
780 sdata->dev->name, sta->sta.addr, sta->sta.aid);
781 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
784 static int ap_sta_ps_end(struct sta_info *sta)
786 struct ieee80211_sub_if_data *sdata = sta->sdata;
787 struct ieee80211_local *local = sdata->local;
791 atomic_dec(&sdata->bss->num_sta_ps);
793 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
794 if (local->ops->sta_notify)
795 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
796 STA_NOTIFY_AWAKE, &sta->sta);
798 if (!skb_queue_empty(&sta->ps_tx_buf))
799 sta_info_clear_tim_bit(sta);
801 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
802 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
803 sdata->dev->name, sta->sta.addr, sta->sta.aid);
804 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
806 /* Send all buffered frames to the station */
807 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
812 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
813 local->total_ps_buffered--;
815 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
816 printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame "
817 "since STA not sleeping anymore\n", sdata->dev->name,
818 sta->sta.addr, sta->sta.aid);
819 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
827 static ieee80211_rx_result debug_noinline
828 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
830 struct sta_info *sta = rx->sta;
831 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
836 /* Update last_rx only for IBSS packets which are for the current
837 * BSSID to avoid keeping the current IBSS network alive in cases where
838 * other STAs are using different BSSID. */
839 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
840 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
841 NL80211_IFTYPE_ADHOC);
842 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
843 sta->last_rx = jiffies;
845 if (!is_multicast_ether_addr(hdr->addr1) ||
846 rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
847 /* Update last_rx only for unicast frames in order to prevent
848 * the Probe Request frames (the only broadcast frames from a
849 * STA in infrastructure mode) from keeping a connection alive.
850 * Mesh beacons will update last_rx when if they are found to
851 * match the current local configuration when processed.
853 sta->last_rx = jiffies;
856 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
859 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
860 ieee80211_sta_rx_notify(rx->sdata, hdr);
863 sta->rx_bytes += rx->skb->len;
864 sta->last_signal = rx->status->signal;
865 sta->last_qual = rx->status->qual;
866 sta->last_noise = rx->status->noise;
869 * Change STA power saving mode only at the end of a frame
872 if (!ieee80211_has_morefrags(hdr->frame_control) &&
873 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
874 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
875 if (test_sta_flags(sta, WLAN_STA_PS)) {
877 * Ignore doze->wake transitions that are
878 * indicated by non-data frames, the standard
879 * is unclear here, but for example going to
880 * PS mode and then scanning would cause a
881 * doze->wake transition for the probe request,
882 * and that is clearly undesirable.
884 if (ieee80211_is_data(hdr->frame_control) &&
885 !ieee80211_has_pm(hdr->frame_control))
886 rx->sent_ps_buffered += ap_sta_ps_end(sta);
888 if (ieee80211_has_pm(hdr->frame_control))
889 ap_sta_ps_start(sta);
893 /* Drop data::nullfunc frames silently, since they are used only to
894 * control station power saving mode. */
895 if (ieee80211_is_nullfunc(hdr->frame_control)) {
896 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
897 /* Update counter and free packet here to avoid counting this
898 * as a dropped packed. */
900 dev_kfree_skb(rx->skb);
905 } /* ieee80211_rx_h_sta_process */
907 static inline struct ieee80211_fragment_entry *
908 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
909 unsigned int frag, unsigned int seq, int rx_queue,
910 struct sk_buff **skb)
912 struct ieee80211_fragment_entry *entry;
915 idx = sdata->fragment_next;
916 entry = &sdata->fragments[sdata->fragment_next++];
917 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
918 sdata->fragment_next = 0;
920 if (!skb_queue_empty(&entry->skb_list)) {
921 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
922 struct ieee80211_hdr *hdr =
923 (struct ieee80211_hdr *) entry->skb_list.next->data;
924 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
925 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
926 "addr1=%pM addr2=%pM\n",
927 sdata->dev->name, idx,
928 jiffies - entry->first_frag_time, entry->seq,
929 entry->last_frag, hdr->addr1, hdr->addr2);
931 __skb_queue_purge(&entry->skb_list);
934 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
936 entry->first_frag_time = jiffies;
938 entry->rx_queue = rx_queue;
939 entry->last_frag = frag;
941 entry->extra_len = 0;
946 static inline struct ieee80211_fragment_entry *
947 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
948 unsigned int frag, unsigned int seq,
949 int rx_queue, struct ieee80211_hdr *hdr)
951 struct ieee80211_fragment_entry *entry;
954 idx = sdata->fragment_next;
955 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
956 struct ieee80211_hdr *f_hdr;
960 idx = IEEE80211_FRAGMENT_MAX - 1;
962 entry = &sdata->fragments[idx];
963 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
964 entry->rx_queue != rx_queue ||
965 entry->last_frag + 1 != frag)
968 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
971 * Check ftype and addresses are equal, else check next fragment
973 if (((hdr->frame_control ^ f_hdr->frame_control) &
974 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
975 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
976 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
979 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
980 __skb_queue_purge(&entry->skb_list);
989 static ieee80211_rx_result debug_noinline
990 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
992 struct ieee80211_hdr *hdr;
995 unsigned int frag, seq;
996 struct ieee80211_fragment_entry *entry;
999 hdr = (struct ieee80211_hdr *)rx->skb->data;
1000 fc = hdr->frame_control;
1001 sc = le16_to_cpu(hdr->seq_ctrl);
1002 frag = sc & IEEE80211_SCTL_FRAG;
1004 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1005 (rx->skb)->len < 24 ||
1006 is_multicast_ether_addr(hdr->addr1))) {
1007 /* not fragmented */
1010 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1012 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1015 /* This is the first fragment of a new frame. */
1016 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1017 rx->queue, &(rx->skb));
1018 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1019 ieee80211_has_protected(fc)) {
1020 /* Store CCMP PN so that we can verify that the next
1021 * fragment has a sequential PN value. */
1023 memcpy(entry->last_pn,
1024 rx->key->u.ccmp.rx_pn[rx->queue],
1030 /* This is a fragment for a frame that should already be pending in
1031 * fragment cache. Add this fragment to the end of the pending entry.
1033 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1035 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1036 return RX_DROP_MONITOR;
1039 /* Verify that MPDUs within one MSDU have sequential PN values.
1040 * (IEEE 802.11i, 8.3.3.4.5) */
1043 u8 pn[CCMP_PN_LEN], *rpn;
1044 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1045 return RX_DROP_UNUSABLE;
1046 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1047 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1052 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1053 if (memcmp(pn, rpn, CCMP_PN_LEN))
1054 return RX_DROP_UNUSABLE;
1055 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1058 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1059 __skb_queue_tail(&entry->skb_list, rx->skb);
1060 entry->last_frag = frag;
1061 entry->extra_len += rx->skb->len;
1062 if (ieee80211_has_morefrags(fc)) {
1067 rx->skb = __skb_dequeue(&entry->skb_list);
1068 if (skb_tailroom(rx->skb) < entry->extra_len) {
1069 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1070 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1072 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1073 __skb_queue_purge(&entry->skb_list);
1074 return RX_DROP_UNUSABLE;
1077 while ((skb = __skb_dequeue(&entry->skb_list))) {
1078 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1082 /* Complete frame has been reassembled - process it now */
1083 rx->flags |= IEEE80211_RX_FRAGMENTED;
1087 rx->sta->rx_packets++;
1088 if (is_multicast_ether_addr(hdr->addr1))
1089 rx->local->dot11MulticastReceivedFrameCount++;
1091 ieee80211_led_rx(rx->local);
1095 static ieee80211_rx_result debug_noinline
1096 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1098 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1099 struct sk_buff *skb;
1100 int no_pending_pkts;
1101 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1103 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1104 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1107 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1108 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1109 return RX_DROP_UNUSABLE;
1111 skb = skb_dequeue(&rx->sta->tx_filtered);
1113 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1115 rx->local->total_ps_buffered--;
1117 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1118 skb_queue_empty(&rx->sta->ps_tx_buf);
1121 struct ieee80211_hdr *hdr =
1122 (struct ieee80211_hdr *) skb->data;
1125 * Tell TX path to send one frame even though the STA may
1126 * still remain is PS mode after this frame exchange.
1128 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1130 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1131 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1132 rx->sta->sta.addr, rx->sta->sta.aid,
1133 skb_queue_len(&rx->sta->ps_tx_buf));
1134 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1136 /* Use MoreData flag to indicate whether there are more
1137 * buffered frames for this STA */
1138 if (no_pending_pkts)
1139 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1141 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1143 dev_queue_xmit(skb);
1145 if (no_pending_pkts)
1146 sta_info_clear_tim_bit(rx->sta);
1147 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1148 } else if (!rx->sent_ps_buffered) {
1150 * FIXME: This can be the result of a race condition between
1151 * us expiring a frame and the station polling for it.
1152 * Should we send it a null-func frame indicating we
1153 * have nothing buffered for it?
1155 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1156 "though there are no buffered frames for it\n",
1157 rx->dev->name, rx->sta->sta.addr);
1158 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1161 /* Free PS Poll skb here instead of returning RX_DROP that would
1162 * count as an dropped frame. */
1163 dev_kfree_skb(rx->skb);
1168 static ieee80211_rx_result debug_noinline
1169 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1171 u8 *data = rx->skb->data;
1172 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1174 if (!ieee80211_is_data_qos(hdr->frame_control))
1177 /* remove the qos control field, update frame type and meta-data */
1178 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1179 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1180 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1181 /* change frame type to non QOS */
1182 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1188 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1190 if (unlikely(!rx->sta ||
1191 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1198 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1201 * Pass through unencrypted frames if the hardware has
1202 * decrypted them already.
1204 if (rx->status->flag & RX_FLAG_DECRYPTED)
1207 /* Drop unencrypted frames if key is set. */
1208 if (unlikely(!ieee80211_has_protected(fc) &&
1209 !ieee80211_is_nullfunc(fc) &&
1210 (!ieee80211_is_mgmt(fc) ||
1211 (ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1212 rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP))) &&
1213 (rx->key || rx->sdata->drop_unencrypted)))
1215 /* BIP does not use Protected field, so need to check MMIE */
1216 if (unlikely(rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP) &&
1217 ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1218 ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1219 (rx->key || rx->sdata->drop_unencrypted)))
1226 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1228 struct net_device *dev = rx->dev;
1229 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1230 u16 hdrlen, ethertype;
1233 u8 src[ETH_ALEN] __aligned(2);
1234 struct sk_buff *skb = rx->skb;
1235 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1237 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1240 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1242 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1244 * IEEE 802.11 address fields:
1245 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1246 * 0 0 DA SA BSSID n/a
1247 * 0 1 DA BSSID SA n/a
1248 * 1 0 BSSID SA DA n/a
1251 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1252 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
1254 switch (hdr->frame_control &
1255 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1256 case cpu_to_le16(IEEE80211_FCTL_TODS):
1257 if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP &&
1258 sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1261 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1262 if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS &&
1263 sdata->vif.type != NL80211_IFTYPE_MESH_POINT))
1265 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1266 struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *)
1267 (skb->data + hdrlen);
1268 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
1269 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
1270 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
1271 memcpy(src, meshdr->eaddr2, ETH_ALEN);
1275 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
1276 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1277 (is_multicast_ether_addr(dst) &&
1278 !compare_ether_addr(src, dev->dev_addr)))
1281 case cpu_to_le16(0):
1282 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1287 if (unlikely(skb->len - hdrlen < 8))
1290 payload = skb->data + hdrlen;
1291 ethertype = (payload[6] << 8) | payload[7];
1293 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1294 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1295 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1296 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1297 * replace EtherType */
1298 skb_pull(skb, hdrlen + 6);
1299 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1300 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1302 struct ethhdr *ehdr;
1305 skb_pull(skb, hdrlen);
1306 len = htons(skb->len);
1307 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1308 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1309 memcpy(ehdr->h_source, src, ETH_ALEN);
1310 ehdr->h_proto = len;
1316 * requires that rx->skb is a frame with ethernet header
1318 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1320 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1321 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1322 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1325 * Allow EAPOL frames to us/the PAE group address regardless
1326 * of whether the frame was encrypted or not.
1328 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1329 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1330 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1333 if (ieee80211_802_1x_port_control(rx) ||
1334 ieee80211_drop_unencrypted(rx, fc))
1341 * requires that rx->skb is a frame with ethernet header
1344 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1346 struct net_device *dev = rx->dev;
1347 struct ieee80211_local *local = rx->local;
1348 struct sk_buff *skb, *xmit_skb;
1349 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1350 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1351 struct sta_info *dsta;
1356 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1357 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1358 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1359 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1360 if (is_multicast_ether_addr(ehdr->h_dest)) {
1362 * send multicast frames both to higher layers in
1363 * local net stack and back to the wireless medium
1365 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1366 if (!xmit_skb && net_ratelimit())
1367 printk(KERN_DEBUG "%s: failed to clone "
1368 "multicast frame\n", dev->name);
1370 dsta = sta_info_get(local, skb->data);
1371 if (dsta && dsta->sdata->dev == dev) {
1373 * The destination station is associated to
1374 * this AP (in this VLAN), so send the frame
1375 * directly to it and do not pass it to local
1385 int align __maybe_unused;
1387 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1389 * 'align' will only take the values 0 or 2 here
1390 * since all frames are required to be aligned
1391 * to 2-byte boundaries when being passed to
1392 * mac80211. That also explains the __skb_push()
1395 align = (unsigned long)skb->data & 4;
1397 if (WARN_ON(skb_headroom(skb) < 3)) {
1401 u8 *data = skb->data;
1402 size_t len = skb->len;
1403 u8 *new = __skb_push(skb, align);
1404 memmove(new, data, len);
1405 __skb_trim(skb, len);
1411 /* deliver to local stack */
1412 skb->protocol = eth_type_trans(skb, dev);
1413 memset(skb->cb, 0, sizeof(skb->cb));
1419 /* send to wireless media */
1420 xmit_skb->protocol = htons(ETH_P_802_3);
1421 skb_reset_network_header(xmit_skb);
1422 skb_reset_mac_header(xmit_skb);
1423 dev_queue_xmit(xmit_skb);
1427 static ieee80211_rx_result debug_noinline
1428 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1430 struct net_device *dev = rx->dev;
1431 struct ieee80211_local *local = rx->local;
1434 struct sk_buff *skb = rx->skb, *frame = NULL;
1435 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1436 __le16 fc = hdr->frame_control;
1437 const struct ethhdr *eth;
1442 if (unlikely(!ieee80211_is_data(fc)))
1445 if (unlikely(!ieee80211_is_data_present(fc)))
1446 return RX_DROP_MONITOR;
1448 if (!(rx->flags & IEEE80211_RX_AMSDU))
1451 err = ieee80211_data_to_8023(rx);
1453 return RX_DROP_UNUSABLE;
1457 dev->stats.rx_packets++;
1458 dev->stats.rx_bytes += skb->len;
1460 /* skip the wrapping header */
1461 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1463 return RX_DROP_UNUSABLE;
1465 while (skb != frame) {
1467 __be16 len = eth->h_proto;
1468 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1470 remaining = skb->len;
1471 memcpy(dst, eth->h_dest, ETH_ALEN);
1472 memcpy(src, eth->h_source, ETH_ALEN);
1474 padding = ((4 - subframe_len) & 0x3);
1475 /* the last MSDU has no padding */
1476 if (subframe_len > remaining)
1477 return RX_DROP_UNUSABLE;
1479 skb_pull(skb, sizeof(struct ethhdr));
1480 /* if last subframe reuse skb */
1481 if (remaining <= subframe_len + padding)
1485 * Allocate and reserve two bytes more for payload
1486 * alignment since sizeof(struct ethhdr) is 14.
1488 frame = dev_alloc_skb(
1489 ALIGN(local->hw.extra_tx_headroom, 4) +
1493 return RX_DROP_UNUSABLE;
1496 ALIGN(local->hw.extra_tx_headroom, 4) +
1497 sizeof(struct ethhdr) + 2);
1498 memcpy(skb_put(frame, ntohs(len)), skb->data,
1501 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1504 dev_kfree_skb(frame);
1505 return RX_DROP_UNUSABLE;
1509 skb_reset_network_header(frame);
1511 frame->priority = skb->priority;
1514 payload = frame->data;
1515 ethertype = (payload[6] << 8) | payload[7];
1517 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1518 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1519 compare_ether_addr(payload,
1520 bridge_tunnel_header) == 0)) {
1521 /* remove RFC1042 or Bridge-Tunnel
1522 * encapsulation and replace EtherType */
1524 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1525 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1527 memcpy(skb_push(frame, sizeof(__be16)),
1528 &len, sizeof(__be16));
1529 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1530 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1533 if (!ieee80211_frame_allowed(rx, fc)) {
1534 if (skb == frame) /* last frame */
1535 return RX_DROP_UNUSABLE;
1536 dev_kfree_skb(frame);
1540 ieee80211_deliver_skb(rx);
1546 #ifdef CONFIG_MAC80211_MESH
1547 static ieee80211_rx_result
1548 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1550 struct ieee80211_hdr *hdr;
1551 struct ieee80211s_hdr *mesh_hdr;
1552 unsigned int hdrlen;
1553 struct sk_buff *skb = rx->skb, *fwd_skb;
1555 hdr = (struct ieee80211_hdr *) skb->data;
1556 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1557 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1559 if (!ieee80211_is_data(hdr->frame_control))
1564 return RX_DROP_MONITOR;
1566 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1567 struct ieee80211_sub_if_data *sdata;
1568 struct mesh_path *mppath;
1570 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1572 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1574 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1576 spin_lock_bh(&mppath->state_lock);
1577 mppath->exp_time = jiffies;
1578 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1579 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1580 spin_unlock_bh(&mppath->state_lock);
1585 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1590 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1592 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1593 dropped_frames_ttl);
1595 struct ieee80211_hdr *fwd_hdr;
1596 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1598 if (!fwd_skb && net_ratelimit())
1599 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1602 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1604 * Save TA to addr1 to send TA a path error if a
1605 * suitable next hop is not found
1607 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1608 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1609 fwd_skb->dev = rx->local->mdev;
1610 fwd_skb->iif = rx->dev->ifindex;
1611 dev_queue_xmit(fwd_skb);
1615 if (is_multicast_ether_addr(hdr->addr3) ||
1616 rx->dev->flags & IFF_PROMISC)
1619 return RX_DROP_MONITOR;
1623 static ieee80211_rx_result debug_noinline
1624 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1626 struct net_device *dev = rx->dev;
1627 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1628 __le16 fc = hdr->frame_control;
1631 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1634 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1635 return RX_DROP_MONITOR;
1637 err = ieee80211_data_to_8023(rx);
1639 return RX_DROP_UNUSABLE;
1641 if (!ieee80211_frame_allowed(rx, fc))
1642 return RX_DROP_MONITOR;
1646 dev->stats.rx_packets++;
1647 dev->stats.rx_bytes += rx->skb->len;
1649 ieee80211_deliver_skb(rx);
1654 static ieee80211_rx_result debug_noinline
1655 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1657 struct ieee80211_local *local = rx->local;
1658 struct ieee80211_hw *hw = &local->hw;
1659 struct sk_buff *skb = rx->skb;
1660 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1661 struct tid_ampdu_rx *tid_agg_rx;
1665 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1668 if (ieee80211_is_back_req(bar->frame_control)) {
1671 tid = le16_to_cpu(bar->control) >> 12;
1672 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1673 != HT_AGG_STATE_OPERATIONAL)
1675 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1677 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1679 /* reset session timer */
1680 if (tid_agg_rx->timeout)
1681 mod_timer(&tid_agg_rx->session_timer,
1682 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1684 /* manage reordering buffer according to requested */
1685 /* sequence number */
1687 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1690 return RX_DROP_UNUSABLE;
1696 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1697 struct ieee80211_mgmt *mgmt,
1700 struct ieee80211_local *local = sdata->local;
1701 struct sk_buff *skb;
1702 struct ieee80211_mgmt *resp;
1704 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1705 /* Not to own unicast address */
1709 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1710 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1711 /* Not from the current AP. */
1715 if (sdata->u.mgd.state == IEEE80211_STA_MLME_ASSOCIATE) {
1716 /* Association in progress; ignore SA Query */
1720 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1721 /* Too short SA Query request frame */
1725 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1729 skb_reserve(skb, local->hw.extra_tx_headroom);
1730 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1731 memset(resp, 0, 24);
1732 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1733 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1734 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1735 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1736 IEEE80211_STYPE_ACTION);
1737 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1738 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1739 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1740 memcpy(resp->u.action.u.sa_query.trans_id,
1741 mgmt->u.action.u.sa_query.trans_id,
1742 WLAN_SA_QUERY_TR_ID_LEN);
1744 ieee80211_tx_skb(sdata, skb, 1);
1747 static ieee80211_rx_result debug_noinline
1748 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1750 struct ieee80211_local *local = rx->local;
1751 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1752 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1753 struct ieee80211_bss *bss;
1754 int len = rx->skb->len;
1756 if (!ieee80211_is_action(mgmt->frame_control))
1760 return RX_DROP_MONITOR;
1762 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1763 return RX_DROP_MONITOR;
1765 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1766 return RX_DROP_MONITOR;
1768 /* all categories we currently handle have action_code */
1769 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1770 return RX_DROP_MONITOR;
1772 switch (mgmt->u.action.category) {
1773 case WLAN_CATEGORY_BACK:
1775 * The aggregation code is not prepared to handle
1776 * anything but STA/AP due to the BSSID handling;
1777 * IBSS could work in the code but isn't supported
1778 * by drivers or the standard.
1780 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1781 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1782 sdata->vif.type != NL80211_IFTYPE_AP)
1783 return RX_DROP_MONITOR;
1785 switch (mgmt->u.action.u.addba_req.action_code) {
1786 case WLAN_ACTION_ADDBA_REQ:
1787 if (len < (IEEE80211_MIN_ACTION_SIZE +
1788 sizeof(mgmt->u.action.u.addba_req)))
1789 return RX_DROP_MONITOR;
1790 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1792 case WLAN_ACTION_ADDBA_RESP:
1793 if (len < (IEEE80211_MIN_ACTION_SIZE +
1794 sizeof(mgmt->u.action.u.addba_resp)))
1795 return RX_DROP_MONITOR;
1796 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1798 case WLAN_ACTION_DELBA:
1799 if (len < (IEEE80211_MIN_ACTION_SIZE +
1800 sizeof(mgmt->u.action.u.delba)))
1801 return RX_DROP_MONITOR;
1802 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1806 case WLAN_CATEGORY_SPECTRUM_MGMT:
1807 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1808 return RX_DROP_MONITOR;
1810 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1811 return RX_DROP_MONITOR;
1813 switch (mgmt->u.action.u.measurement.action_code) {
1814 case WLAN_ACTION_SPCT_MSR_REQ:
1815 if (len < (IEEE80211_MIN_ACTION_SIZE +
1816 sizeof(mgmt->u.action.u.measurement)))
1817 return RX_DROP_MONITOR;
1818 ieee80211_process_measurement_req(sdata, mgmt, len);
1820 case WLAN_ACTION_SPCT_CHL_SWITCH:
1821 if (len < (IEEE80211_MIN_ACTION_SIZE +
1822 sizeof(mgmt->u.action.u.chan_switch)))
1823 return RX_DROP_MONITOR;
1825 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1826 return RX_DROP_MONITOR;
1828 bss = ieee80211_rx_bss_get(local, sdata->u.mgd.bssid,
1829 local->hw.conf.channel->center_freq,
1831 sdata->u.mgd.ssid_len);
1833 return RX_DROP_MONITOR;
1835 ieee80211_process_chanswitch(sdata,
1836 &mgmt->u.action.u.chan_switch.sw_elem, bss);
1837 ieee80211_rx_bss_put(local, bss);
1841 case WLAN_CATEGORY_SA_QUERY:
1842 if (len < (IEEE80211_MIN_ACTION_SIZE +
1843 sizeof(mgmt->u.action.u.sa_query)))
1844 return RX_DROP_MONITOR;
1845 switch (mgmt->u.action.u.sa_query.action) {
1846 case WLAN_ACTION_SA_QUERY_REQUEST:
1847 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1848 return RX_DROP_MONITOR;
1849 ieee80211_process_sa_query_req(sdata, mgmt, len);
1851 case WLAN_ACTION_SA_QUERY_RESPONSE:
1853 * SA Query response is currently only used in AP mode
1854 * and it is processed in user space.
1863 rx->sta->rx_packets++;
1864 dev_kfree_skb(rx->skb);
1868 static ieee80211_rx_result debug_noinline
1869 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1871 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1872 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1874 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1875 return RX_DROP_MONITOR;
1877 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1878 return RX_DROP_MONITOR;
1880 if (ieee80211_vif_is_mesh(&sdata->vif))
1881 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1883 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1884 return ieee80211_ibss_rx_mgmt(sdata, rx->skb, rx->status);
1886 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1887 return ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
1889 return RX_DROP_MONITOR;
1892 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1893 struct ieee80211_hdr *hdr,
1894 struct ieee80211_rx_data *rx)
1897 unsigned int hdrlen;
1899 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1900 if (rx->skb->len >= hdrlen + 4)
1901 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1907 * Some hardware seem to generate incorrect Michael MIC
1908 * reports; ignore them to avoid triggering countermeasures.
1913 if (!ieee80211_has_protected(hdr->frame_control))
1916 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1918 * APs with pairwise keys should never receive Michael MIC
1919 * errors for non-zero keyidx because these are reserved for
1920 * group keys and only the AP is sending real multicast
1921 * frames in the BSS.
1926 if (!ieee80211_is_data(hdr->frame_control) &&
1927 !ieee80211_is_auth(hdr->frame_control))
1930 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
1932 dev_kfree_skb(rx->skb);
1936 /* TODO: use IEEE80211_RX_FRAGMENTED */
1937 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1939 struct ieee80211_sub_if_data *sdata;
1940 struct ieee80211_local *local = rx->local;
1941 struct ieee80211_rtap_hdr {
1942 struct ieee80211_radiotap_header hdr;
1947 } __attribute__ ((packed)) *rthdr;
1948 struct sk_buff *skb = rx->skb, *skb2;
1949 struct net_device *prev_dev = NULL;
1950 struct ieee80211_rx_status *status = rx->status;
1952 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1955 if (skb_headroom(skb) < sizeof(*rthdr) &&
1956 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1959 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1960 memset(rthdr, 0, sizeof(*rthdr));
1961 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1962 rthdr->hdr.it_present =
1963 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1964 (1 << IEEE80211_RADIOTAP_RATE) |
1965 (1 << IEEE80211_RADIOTAP_CHANNEL));
1967 rthdr->rate = rx->rate->bitrate / 5;
1968 rthdr->chan_freq = cpu_to_le16(status->freq);
1970 if (status->band == IEEE80211_BAND_5GHZ)
1971 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1972 IEEE80211_CHAN_5GHZ);
1974 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1975 IEEE80211_CHAN_2GHZ);
1977 skb_set_mac_header(skb, 0);
1978 skb->ip_summed = CHECKSUM_UNNECESSARY;
1979 skb->pkt_type = PACKET_OTHERHOST;
1980 skb->protocol = htons(ETH_P_802_2);
1982 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1983 if (!netif_running(sdata->dev))
1986 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1987 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1991 skb2 = skb_clone(skb, GFP_ATOMIC);
1993 skb2->dev = prev_dev;
1998 prev_dev = sdata->dev;
1999 sdata->dev->stats.rx_packets++;
2000 sdata->dev->stats.rx_bytes += skb->len;
2004 skb->dev = prev_dev;
2010 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
2018 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
2019 struct ieee80211_rx_data *rx,
2020 struct sk_buff *skb)
2022 ieee80211_rx_result res = RX_DROP_MONITOR;
2026 rx->dev = sdata->dev;
2028 #define CALL_RXH(rxh) \
2031 if (res != RX_CONTINUE) \
2035 CALL_RXH(ieee80211_rx_h_passive_scan)
2036 CALL_RXH(ieee80211_rx_h_check)
2037 CALL_RXH(ieee80211_rx_h_decrypt)
2038 CALL_RXH(ieee80211_rx_h_check_more_data)
2039 CALL_RXH(ieee80211_rx_h_sta_process)
2040 CALL_RXH(ieee80211_rx_h_defragment)
2041 CALL_RXH(ieee80211_rx_h_ps_poll)
2042 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2043 /* must be after MMIC verify so header is counted in MPDU mic */
2044 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2045 CALL_RXH(ieee80211_rx_h_amsdu)
2046 #ifdef CONFIG_MAC80211_MESH
2047 if (ieee80211_vif_is_mesh(&sdata->vif))
2048 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2050 CALL_RXH(ieee80211_rx_h_data)
2051 CALL_RXH(ieee80211_rx_h_ctrl)
2052 CALL_RXH(ieee80211_rx_h_action)
2053 CALL_RXH(ieee80211_rx_h_mgmt)
2059 case RX_DROP_MONITOR:
2060 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2062 rx->sta->rx_dropped++;
2065 ieee80211_rx_cooked_monitor(rx);
2067 case RX_DROP_UNUSABLE:
2068 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2070 rx->sta->rx_dropped++;
2071 dev_kfree_skb(rx->skb);
2074 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2079 /* main receive path */
2081 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2082 struct ieee80211_rx_data *rx,
2083 struct ieee80211_hdr *hdr)
2085 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
2086 int multicast = is_multicast_ether_addr(hdr->addr1);
2088 switch (sdata->vif.type) {
2089 case NL80211_IFTYPE_STATION:
2092 if (!ieee80211_bssid_match(bssid, sdata->u.mgd.bssid)) {
2093 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2095 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2096 } else if (!multicast &&
2097 compare_ether_addr(sdata->dev->dev_addr,
2099 if (!(sdata->dev->flags & IFF_PROMISC))
2101 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2104 case NL80211_IFTYPE_ADHOC:
2107 if (ieee80211_is_beacon(hdr->frame_control)) {
2110 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2111 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2113 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2114 } else if (!multicast &&
2115 compare_ether_addr(sdata->dev->dev_addr,
2117 if (!(sdata->dev->flags & IFF_PROMISC))
2119 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2120 } else if (!rx->sta) {
2122 if (rx->status->flag & RX_FLAG_HT)
2123 rate_idx = 0; /* TODO: HT rates */
2125 rate_idx = rx->status->rate_idx;
2126 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2130 case NL80211_IFTYPE_MESH_POINT:
2132 compare_ether_addr(sdata->dev->dev_addr,
2134 if (!(sdata->dev->flags & IFF_PROMISC))
2137 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2140 case NL80211_IFTYPE_AP_VLAN:
2141 case NL80211_IFTYPE_AP:
2143 if (compare_ether_addr(sdata->dev->dev_addr,
2146 } else if (!ieee80211_bssid_match(bssid,
2147 sdata->dev->dev_addr)) {
2148 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2150 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2153 case NL80211_IFTYPE_WDS:
2154 if (bssid || !ieee80211_is_data(hdr->frame_control))
2156 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2159 case NL80211_IFTYPE_MONITOR:
2160 /* take everything */
2162 case NL80211_IFTYPE_UNSPECIFIED:
2163 case __NL80211_IFTYPE_AFTER_LAST:
2164 /* should never get here */
2173 * This is the actual Rx frames handler. as it blongs to Rx path it must
2174 * be called with rcu_read_lock protection.
2176 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2177 struct sk_buff *skb,
2178 struct ieee80211_rx_status *status,
2179 struct ieee80211_rate *rate)
2181 struct ieee80211_local *local = hw_to_local(hw);
2182 struct ieee80211_sub_if_data *sdata;
2183 struct ieee80211_hdr *hdr;
2184 struct ieee80211_rx_data rx;
2186 struct ieee80211_sub_if_data *prev = NULL;
2187 struct sk_buff *skb_new;
2189 hdr = (struct ieee80211_hdr *)skb->data;
2190 memset(&rx, 0, sizeof(rx));
2197 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2198 local->dot11ReceivedFragmentCount++;
2200 rx.sta = sta_info_get(local, hdr->addr2);
2202 rx.sdata = rx.sta->sdata;
2203 rx.dev = rx.sta->sdata->dev;
2206 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
2207 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
2211 if (unlikely(local->sw_scanning || local->hw_scanning))
2212 rx.flags |= IEEE80211_RX_IN_SCAN;
2214 ieee80211_parse_qos(&rx);
2215 ieee80211_verify_alignment(&rx);
2219 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2220 if (!netif_running(sdata->dev))
2223 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2226 rx.flags |= IEEE80211_RX_RA_MATCH;
2227 prepares = prepare_for_handlers(sdata, &rx, hdr);
2233 * frame is destined for this interface, but if it's not
2234 * also for the previous one we handle that after the
2235 * loop to avoid copying the SKB once too much
2244 * frame was destined for the previous interface
2245 * so invoke RX handlers for it
2248 skb_new = skb_copy(skb, GFP_ATOMIC);
2250 if (net_ratelimit())
2251 printk(KERN_DEBUG "%s: failed to copy "
2252 "multicast frame for %s\n",
2253 wiphy_name(local->hw.wiphy),
2257 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2261 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2266 #define SEQ_MODULO 0x1000
2267 #define SEQ_MASK 0xfff
2269 static inline int seq_less(u16 sq1, u16 sq2)
2271 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2274 static inline u16 seq_inc(u16 sq)
2276 return (sq + 1) & SEQ_MASK;
2279 static inline u16 seq_sub(u16 sq1, u16 sq2)
2281 return (sq1 - sq2) & SEQ_MASK;
2286 * As it function blongs to Rx path it must be called with
2287 * the proper rcu_read_lock protection for its flow.
2289 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2290 struct tid_ampdu_rx *tid_agg_rx,
2291 struct sk_buff *skb,
2295 struct ieee80211_local *local = hw_to_local(hw);
2296 struct ieee80211_rx_status status;
2297 u16 head_seq_num, buf_size;
2299 struct ieee80211_supported_band *sband;
2300 struct ieee80211_rate *rate;
2302 buf_size = tid_agg_rx->buf_size;
2303 head_seq_num = tid_agg_rx->head_seq_num;
2305 /* frame with out of date sequence number */
2306 if (seq_less(mpdu_seq_num, head_seq_num)) {
2311 /* if frame sequence number exceeds our buffering window size or
2312 * block Ack Request arrived - release stored frames */
2313 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2314 /* new head to the ordering buffer */
2316 head_seq_num = mpdu_seq_num;
2319 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2320 /* release stored frames up to new head to stack */
2321 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2322 index = seq_sub(tid_agg_rx->head_seq_num,
2324 % tid_agg_rx->buf_size;
2326 if (tid_agg_rx->reorder_buf[index]) {
2327 /* release the reordered frames to stack */
2329 tid_agg_rx->reorder_buf[index]->cb,
2331 sband = local->hw.wiphy->bands[status.band];
2332 if (status.flag & RX_FLAG_HT) {
2333 /* TODO: HT rates */
2334 rate = sband->bitrates;
2336 rate = &sband->bitrates
2339 __ieee80211_rx_handle_packet(hw,
2340 tid_agg_rx->reorder_buf[index],
2342 tid_agg_rx->stored_mpdu_num--;
2343 tid_agg_rx->reorder_buf[index] = NULL;
2345 tid_agg_rx->head_seq_num =
2346 seq_inc(tid_agg_rx->head_seq_num);
2352 /* now the new frame is always in the range of the reordering */
2354 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2355 % tid_agg_rx->buf_size;
2356 /* check if we already stored this frame */
2357 if (tid_agg_rx->reorder_buf[index]) {
2362 /* if arrived mpdu is in the right order and nothing else stored */
2363 /* release it immediately */
2364 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2365 tid_agg_rx->stored_mpdu_num == 0) {
2366 tid_agg_rx->head_seq_num =
2367 seq_inc(tid_agg_rx->head_seq_num);
2371 /* put the frame in the reordering buffer */
2372 tid_agg_rx->reorder_buf[index] = skb;
2373 tid_agg_rx->stored_mpdu_num++;
2374 /* release the buffer until next missing frame */
2375 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2376 % tid_agg_rx->buf_size;
2377 while (tid_agg_rx->reorder_buf[index]) {
2378 /* release the reordered frame back to stack */
2379 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2381 sband = local->hw.wiphy->bands[status.band];
2382 if (status.flag & RX_FLAG_HT)
2383 rate = sband->bitrates; /* TODO: HT rates */
2385 rate = &sband->bitrates[status.rate_idx];
2386 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2388 tid_agg_rx->stored_mpdu_num--;
2389 tid_agg_rx->reorder_buf[index] = NULL;
2390 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2391 index = seq_sub(tid_agg_rx->head_seq_num,
2392 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2397 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2398 struct sk_buff *skb)
2400 struct ieee80211_hw *hw = &local->hw;
2401 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2402 struct sta_info *sta;
2403 struct tid_ampdu_rx *tid_agg_rx;
2409 sta = sta_info_get(local, hdr->addr2);
2413 /* filter the QoS data rx stream according to
2414 * STA/TID and check if this STA/TID is on aggregation */
2415 if (!ieee80211_is_data_qos(hdr->frame_control))
2418 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2420 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2423 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2425 /* qos null data frames are excluded */
2426 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2429 /* new un-ordered ampdu frame - process it */
2431 /* reset session timer */
2432 if (tid_agg_rx->timeout)
2433 mod_timer(&tid_agg_rx->session_timer,
2434 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2436 /* if this mpdu is fragmented - terminate rx aggregation session */
2437 sc = le16_to_cpu(hdr->seq_ctrl);
2438 if (sc & IEEE80211_SCTL_FRAG) {
2439 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2440 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2445 /* according to mpdu sequence number deal with reordering buffer */
2446 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2447 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2454 * This is the receive path handler. It is called by a low level driver when an
2455 * 802.11 MPDU is received from the hardware.
2457 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2458 struct ieee80211_rx_status *status)
2460 struct ieee80211_local *local = hw_to_local(hw);
2461 struct ieee80211_rate *rate = NULL;
2462 struct ieee80211_supported_band *sband;
2464 if (status->band < 0 ||
2465 status->band >= IEEE80211_NUM_BANDS) {
2470 sband = local->hw.wiphy->bands[status->band];
2476 if (status->flag & RX_FLAG_HT) {
2477 /* rate_idx is MCS index */
2478 if (WARN_ON(status->rate_idx < 0 ||
2479 status->rate_idx >= 76))
2481 /* HT rates are not in the table - use the highest legacy rate
2482 * for now since other parts of mac80211 may not yet be fully
2484 rate = &sband->bitrates[sband->n_bitrates - 1];
2486 if (WARN_ON(status->rate_idx < 0 ||
2487 status->rate_idx >= sband->n_bitrates))
2489 rate = &sband->bitrates[status->rate_idx];
2493 * key references and virtual interfaces are protected using RCU
2494 * and this requires that we are in a read-side RCU section during
2495 * receive processing
2500 * Frames with failed FCS/PLCP checksum are not returned,
2501 * all other frames are returned without radiotap header
2502 * if it was previously present.
2503 * Also, frames with less than 16 bytes are dropped.
2505 skb = ieee80211_rx_monitor(local, skb, status, rate);
2511 if (!ieee80211_rx_reorder_ampdu(local, skb))
2512 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2516 EXPORT_SYMBOL(__ieee80211_rx);
2518 /* This is a version of the rx handler that can be called from hard irq
2519 * context. Post the skb on the queue and schedule the tasklet */
2520 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2521 struct ieee80211_rx_status *status)
2523 struct ieee80211_local *local = hw_to_local(hw);
2525 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2527 skb->dev = local->mdev;
2528 /* copy status into skb->cb for use by tasklet */
2529 memcpy(skb->cb, status, sizeof(*status));
2530 skb->pkt_type = IEEE80211_RX_MSG;
2531 skb_queue_tail(&local->skb_queue, skb);
2532 tasklet_schedule(&local->tasklet);
2534 EXPORT_SYMBOL(ieee80211_rx_irqsafe);