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))
860 sta->rx_bytes += rx->skb->len;
861 sta->last_signal = rx->status->signal;
862 sta->last_qual = rx->status->qual;
863 sta->last_noise = rx->status->noise;
866 * Change STA power saving mode only at the end of a frame
869 if (!ieee80211_has_morefrags(hdr->frame_control) &&
870 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
871 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
872 if (test_sta_flags(sta, WLAN_STA_PS)) {
874 * Ignore doze->wake transitions that are
875 * indicated by non-data frames, the standard
876 * is unclear here, but for example going to
877 * PS mode and then scanning would cause a
878 * doze->wake transition for the probe request,
879 * and that is clearly undesirable.
881 if (ieee80211_is_data(hdr->frame_control) &&
882 !ieee80211_has_pm(hdr->frame_control))
883 rx->sent_ps_buffered += ap_sta_ps_end(sta);
885 if (ieee80211_has_pm(hdr->frame_control))
886 ap_sta_ps_start(sta);
890 /* Drop data::nullfunc frames silently, since they are used only to
891 * control station power saving mode. */
892 if (ieee80211_is_nullfunc(hdr->frame_control)) {
893 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
894 /* Update counter and free packet here to avoid counting this
895 * as a dropped packed. */
897 dev_kfree_skb(rx->skb);
902 } /* ieee80211_rx_h_sta_process */
904 static inline struct ieee80211_fragment_entry *
905 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
906 unsigned int frag, unsigned int seq, int rx_queue,
907 struct sk_buff **skb)
909 struct ieee80211_fragment_entry *entry;
912 idx = sdata->fragment_next;
913 entry = &sdata->fragments[sdata->fragment_next++];
914 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
915 sdata->fragment_next = 0;
917 if (!skb_queue_empty(&entry->skb_list)) {
918 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
919 struct ieee80211_hdr *hdr =
920 (struct ieee80211_hdr *) entry->skb_list.next->data;
921 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
922 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
923 "addr1=%pM addr2=%pM\n",
924 sdata->dev->name, idx,
925 jiffies - entry->first_frag_time, entry->seq,
926 entry->last_frag, hdr->addr1, hdr->addr2);
928 __skb_queue_purge(&entry->skb_list);
931 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
933 entry->first_frag_time = jiffies;
935 entry->rx_queue = rx_queue;
936 entry->last_frag = frag;
938 entry->extra_len = 0;
943 static inline struct ieee80211_fragment_entry *
944 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
945 unsigned int frag, unsigned int seq,
946 int rx_queue, struct ieee80211_hdr *hdr)
948 struct ieee80211_fragment_entry *entry;
951 idx = sdata->fragment_next;
952 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
953 struct ieee80211_hdr *f_hdr;
957 idx = IEEE80211_FRAGMENT_MAX - 1;
959 entry = &sdata->fragments[idx];
960 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
961 entry->rx_queue != rx_queue ||
962 entry->last_frag + 1 != frag)
965 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
968 * Check ftype and addresses are equal, else check next fragment
970 if (((hdr->frame_control ^ f_hdr->frame_control) &
971 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
972 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
973 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
976 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
977 __skb_queue_purge(&entry->skb_list);
986 static ieee80211_rx_result debug_noinline
987 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
989 struct ieee80211_hdr *hdr;
992 unsigned int frag, seq;
993 struct ieee80211_fragment_entry *entry;
996 hdr = (struct ieee80211_hdr *)rx->skb->data;
997 fc = hdr->frame_control;
998 sc = le16_to_cpu(hdr->seq_ctrl);
999 frag = sc & IEEE80211_SCTL_FRAG;
1001 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1002 (rx->skb)->len < 24 ||
1003 is_multicast_ether_addr(hdr->addr1))) {
1004 /* not fragmented */
1007 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1009 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1012 /* This is the first fragment of a new frame. */
1013 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1014 rx->queue, &(rx->skb));
1015 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1016 ieee80211_has_protected(fc)) {
1017 /* Store CCMP PN so that we can verify that the next
1018 * fragment has a sequential PN value. */
1020 memcpy(entry->last_pn,
1021 rx->key->u.ccmp.rx_pn[rx->queue],
1027 /* This is a fragment for a frame that should already be pending in
1028 * fragment cache. Add this fragment to the end of the pending entry.
1030 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1032 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1033 return RX_DROP_MONITOR;
1036 /* Verify that MPDUs within one MSDU have sequential PN values.
1037 * (IEEE 802.11i, 8.3.3.4.5) */
1040 u8 pn[CCMP_PN_LEN], *rpn;
1041 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1042 return RX_DROP_UNUSABLE;
1043 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1044 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1049 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1050 if (memcmp(pn, rpn, CCMP_PN_LEN))
1051 return RX_DROP_UNUSABLE;
1052 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1055 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1056 __skb_queue_tail(&entry->skb_list, rx->skb);
1057 entry->last_frag = frag;
1058 entry->extra_len += rx->skb->len;
1059 if (ieee80211_has_morefrags(fc)) {
1064 rx->skb = __skb_dequeue(&entry->skb_list);
1065 if (skb_tailroom(rx->skb) < entry->extra_len) {
1066 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1067 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1069 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1070 __skb_queue_purge(&entry->skb_list);
1071 return RX_DROP_UNUSABLE;
1074 while ((skb = __skb_dequeue(&entry->skb_list))) {
1075 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1079 /* Complete frame has been reassembled - process it now */
1080 rx->flags |= IEEE80211_RX_FRAGMENTED;
1084 rx->sta->rx_packets++;
1085 if (is_multicast_ether_addr(hdr->addr1))
1086 rx->local->dot11MulticastReceivedFrameCount++;
1088 ieee80211_led_rx(rx->local);
1092 static ieee80211_rx_result debug_noinline
1093 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1095 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1096 struct sk_buff *skb;
1097 int no_pending_pkts;
1098 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1100 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1101 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1104 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1105 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1106 return RX_DROP_UNUSABLE;
1108 skb = skb_dequeue(&rx->sta->tx_filtered);
1110 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1112 rx->local->total_ps_buffered--;
1114 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1115 skb_queue_empty(&rx->sta->ps_tx_buf);
1118 struct ieee80211_hdr *hdr =
1119 (struct ieee80211_hdr *) skb->data;
1122 * Tell TX path to send one frame even though the STA may
1123 * still remain is PS mode after this frame exchange.
1125 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1127 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1128 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1129 rx->sta->sta.addr, rx->sta->sta.aid,
1130 skb_queue_len(&rx->sta->ps_tx_buf));
1131 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1133 /* Use MoreData flag to indicate whether there are more
1134 * buffered frames for this STA */
1135 if (no_pending_pkts)
1136 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1138 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1140 dev_queue_xmit(skb);
1142 if (no_pending_pkts)
1143 sta_info_clear_tim_bit(rx->sta);
1144 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1145 } else if (!rx->sent_ps_buffered) {
1147 * FIXME: This can be the result of a race condition between
1148 * us expiring a frame and the station polling for it.
1149 * Should we send it a null-func frame indicating we
1150 * have nothing buffered for it?
1152 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1153 "though there are no buffered frames for it\n",
1154 rx->dev->name, rx->sta->sta.addr);
1155 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1158 /* Free PS Poll skb here instead of returning RX_DROP that would
1159 * count as an dropped frame. */
1160 dev_kfree_skb(rx->skb);
1165 static ieee80211_rx_result debug_noinline
1166 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1168 u8 *data = rx->skb->data;
1169 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1171 if (!ieee80211_is_data_qos(hdr->frame_control))
1174 /* remove the qos control field, update frame type and meta-data */
1175 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1176 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1177 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1178 /* change frame type to non QOS */
1179 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1185 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1187 if (unlikely(!rx->sta ||
1188 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1195 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1198 * Pass through unencrypted frames if the hardware has
1199 * decrypted them already.
1201 if (rx->status->flag & RX_FLAG_DECRYPTED)
1204 /* Drop unencrypted frames if key is set. */
1205 if (unlikely(!ieee80211_has_protected(fc) &&
1206 !ieee80211_is_nullfunc(fc) &&
1207 (!ieee80211_is_mgmt(fc) ||
1208 (ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1209 rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP))) &&
1210 (rx->key || rx->sdata->drop_unencrypted)))
1212 /* BIP does not use Protected field, so need to check MMIE */
1213 if (unlikely(rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP) &&
1214 ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1215 ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1216 (rx->key || rx->sdata->drop_unencrypted)))
1223 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1225 struct net_device *dev = rx->dev;
1226 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1227 u16 hdrlen, ethertype;
1230 u8 src[ETH_ALEN] __aligned(2);
1231 struct sk_buff *skb = rx->skb;
1232 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1234 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1237 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1239 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1241 * IEEE 802.11 address fields:
1242 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1243 * 0 0 DA SA BSSID n/a
1244 * 0 1 DA BSSID SA n/a
1245 * 1 0 BSSID SA DA n/a
1248 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1249 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
1251 switch (hdr->frame_control &
1252 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1253 case cpu_to_le16(IEEE80211_FCTL_TODS):
1254 if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP &&
1255 sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1258 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1259 if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS &&
1260 sdata->vif.type != NL80211_IFTYPE_MESH_POINT))
1262 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1263 struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *)
1264 (skb->data + hdrlen);
1265 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
1266 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
1267 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
1268 memcpy(src, meshdr->eaddr2, ETH_ALEN);
1272 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
1273 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1274 (is_multicast_ether_addr(dst) &&
1275 !compare_ether_addr(src, dev->dev_addr)))
1278 case cpu_to_le16(0):
1279 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1284 if (unlikely(skb->len - hdrlen < 8))
1287 payload = skb->data + hdrlen;
1288 ethertype = (payload[6] << 8) | payload[7];
1290 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1291 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1292 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1293 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1294 * replace EtherType */
1295 skb_pull(skb, hdrlen + 6);
1296 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1297 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1299 struct ethhdr *ehdr;
1302 skb_pull(skb, hdrlen);
1303 len = htons(skb->len);
1304 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1305 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1306 memcpy(ehdr->h_source, src, ETH_ALEN);
1307 ehdr->h_proto = len;
1313 * requires that rx->skb is a frame with ethernet header
1315 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1317 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1318 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1319 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1322 * Allow EAPOL frames to us/the PAE group address regardless
1323 * of whether the frame was encrypted or not.
1325 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1326 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1327 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1330 if (ieee80211_802_1x_port_control(rx) ||
1331 ieee80211_drop_unencrypted(rx, fc))
1338 * requires that rx->skb is a frame with ethernet header
1341 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1343 struct net_device *dev = rx->dev;
1344 struct ieee80211_local *local = rx->local;
1345 struct sk_buff *skb, *xmit_skb;
1346 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1347 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1348 struct sta_info *dsta;
1353 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1354 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1355 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1356 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1357 if (is_multicast_ether_addr(ehdr->h_dest)) {
1359 * send multicast frames both to higher layers in
1360 * local net stack and back to the wireless medium
1362 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1363 if (!xmit_skb && net_ratelimit())
1364 printk(KERN_DEBUG "%s: failed to clone "
1365 "multicast frame\n", dev->name);
1367 dsta = sta_info_get(local, skb->data);
1368 if (dsta && dsta->sdata->dev == dev) {
1370 * The destination station is associated to
1371 * this AP (in this VLAN), so send the frame
1372 * directly to it and do not pass it to local
1382 int align __maybe_unused;
1384 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1386 * 'align' will only take the values 0 or 2 here
1387 * since all frames are required to be aligned
1388 * to 2-byte boundaries when being passed to
1389 * mac80211. That also explains the __skb_push()
1392 align = (unsigned long)skb->data & 4;
1394 if (WARN_ON(skb_headroom(skb) < 3)) {
1398 u8 *data = skb->data;
1399 size_t len = skb->len;
1400 u8 *new = __skb_push(skb, align);
1401 memmove(new, data, len);
1402 __skb_trim(skb, len);
1408 /* deliver to local stack */
1409 skb->protocol = eth_type_trans(skb, dev);
1410 memset(skb->cb, 0, sizeof(skb->cb));
1416 /* send to wireless media */
1417 xmit_skb->protocol = htons(ETH_P_802_3);
1418 skb_reset_network_header(xmit_skb);
1419 skb_reset_mac_header(xmit_skb);
1420 dev_queue_xmit(xmit_skb);
1424 static ieee80211_rx_result debug_noinline
1425 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1427 struct net_device *dev = rx->dev;
1428 struct ieee80211_local *local = rx->local;
1431 struct sk_buff *skb = rx->skb, *frame = NULL;
1432 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1433 __le16 fc = hdr->frame_control;
1434 const struct ethhdr *eth;
1439 if (unlikely(!ieee80211_is_data(fc)))
1442 if (unlikely(!ieee80211_is_data_present(fc)))
1443 return RX_DROP_MONITOR;
1445 if (!(rx->flags & IEEE80211_RX_AMSDU))
1448 err = ieee80211_data_to_8023(rx);
1450 return RX_DROP_UNUSABLE;
1454 dev->stats.rx_packets++;
1455 dev->stats.rx_bytes += skb->len;
1457 /* skip the wrapping header */
1458 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1460 return RX_DROP_UNUSABLE;
1462 while (skb != frame) {
1464 __be16 len = eth->h_proto;
1465 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1467 remaining = skb->len;
1468 memcpy(dst, eth->h_dest, ETH_ALEN);
1469 memcpy(src, eth->h_source, ETH_ALEN);
1471 padding = ((4 - subframe_len) & 0x3);
1472 /* the last MSDU has no padding */
1473 if (subframe_len > remaining)
1474 return RX_DROP_UNUSABLE;
1476 skb_pull(skb, sizeof(struct ethhdr));
1477 /* if last subframe reuse skb */
1478 if (remaining <= subframe_len + padding)
1482 * Allocate and reserve two bytes more for payload
1483 * alignment since sizeof(struct ethhdr) is 14.
1485 frame = dev_alloc_skb(
1486 ALIGN(local->hw.extra_tx_headroom, 4) +
1490 return RX_DROP_UNUSABLE;
1493 ALIGN(local->hw.extra_tx_headroom, 4) +
1494 sizeof(struct ethhdr) + 2);
1495 memcpy(skb_put(frame, ntohs(len)), skb->data,
1498 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1501 dev_kfree_skb(frame);
1502 return RX_DROP_UNUSABLE;
1506 skb_reset_network_header(frame);
1508 frame->priority = skb->priority;
1511 payload = frame->data;
1512 ethertype = (payload[6] << 8) | payload[7];
1514 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1515 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1516 compare_ether_addr(payload,
1517 bridge_tunnel_header) == 0)) {
1518 /* remove RFC1042 or Bridge-Tunnel
1519 * encapsulation and replace EtherType */
1521 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1522 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1524 memcpy(skb_push(frame, sizeof(__be16)),
1525 &len, sizeof(__be16));
1526 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1527 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1530 if (!ieee80211_frame_allowed(rx, fc)) {
1531 if (skb == frame) /* last frame */
1532 return RX_DROP_UNUSABLE;
1533 dev_kfree_skb(frame);
1537 ieee80211_deliver_skb(rx);
1543 #ifdef CONFIG_MAC80211_MESH
1544 static ieee80211_rx_result
1545 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1547 struct ieee80211_hdr *hdr;
1548 struct ieee80211s_hdr *mesh_hdr;
1549 unsigned int hdrlen;
1550 struct sk_buff *skb = rx->skb, *fwd_skb;
1552 hdr = (struct ieee80211_hdr *) skb->data;
1553 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1554 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1556 if (!ieee80211_is_data(hdr->frame_control))
1561 return RX_DROP_MONITOR;
1563 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1564 struct ieee80211_sub_if_data *sdata;
1565 struct mesh_path *mppath;
1567 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1569 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1571 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1573 spin_lock_bh(&mppath->state_lock);
1574 mppath->exp_time = jiffies;
1575 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1576 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1577 spin_unlock_bh(&mppath->state_lock);
1582 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1587 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1589 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1590 dropped_frames_ttl);
1592 struct ieee80211_hdr *fwd_hdr;
1593 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1595 if (!fwd_skb && net_ratelimit())
1596 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1599 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1601 * Save TA to addr1 to send TA a path error if a
1602 * suitable next hop is not found
1604 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1605 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1606 fwd_skb->dev = rx->local->mdev;
1607 fwd_skb->iif = rx->dev->ifindex;
1608 dev_queue_xmit(fwd_skb);
1612 if (is_multicast_ether_addr(hdr->addr3) ||
1613 rx->dev->flags & IFF_PROMISC)
1616 return RX_DROP_MONITOR;
1620 static ieee80211_rx_result debug_noinline
1621 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1623 struct net_device *dev = rx->dev;
1624 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1625 __le16 fc = hdr->frame_control;
1628 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1631 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1632 return RX_DROP_MONITOR;
1634 err = ieee80211_data_to_8023(rx);
1636 return RX_DROP_UNUSABLE;
1638 if (!ieee80211_frame_allowed(rx, fc))
1639 return RX_DROP_MONITOR;
1643 dev->stats.rx_packets++;
1644 dev->stats.rx_bytes += rx->skb->len;
1646 ieee80211_deliver_skb(rx);
1651 static ieee80211_rx_result debug_noinline
1652 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1654 struct ieee80211_local *local = rx->local;
1655 struct ieee80211_hw *hw = &local->hw;
1656 struct sk_buff *skb = rx->skb;
1657 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1658 struct tid_ampdu_rx *tid_agg_rx;
1662 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1665 if (ieee80211_is_back_req(bar->frame_control)) {
1668 tid = le16_to_cpu(bar->control) >> 12;
1669 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1670 != HT_AGG_STATE_OPERATIONAL)
1672 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1674 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1676 /* reset session timer */
1677 if (tid_agg_rx->timeout)
1678 mod_timer(&tid_agg_rx->session_timer,
1679 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1681 /* manage reordering buffer according to requested */
1682 /* sequence number */
1684 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1687 return RX_DROP_UNUSABLE;
1693 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1694 struct ieee80211_mgmt *mgmt,
1697 struct ieee80211_local *local = sdata->local;
1698 struct sk_buff *skb;
1699 struct ieee80211_mgmt *resp;
1701 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1702 /* Not to own unicast address */
1706 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1707 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1708 /* Not from the current AP. */
1712 if (sdata->u.mgd.state == IEEE80211_STA_MLME_ASSOCIATE) {
1713 /* Association in progress; ignore SA Query */
1717 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1718 /* Too short SA Query request frame */
1722 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1726 skb_reserve(skb, local->hw.extra_tx_headroom);
1727 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1728 memset(resp, 0, 24);
1729 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1730 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1731 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1732 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1733 IEEE80211_STYPE_ACTION);
1734 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1735 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1736 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1737 memcpy(resp->u.action.u.sa_query.trans_id,
1738 mgmt->u.action.u.sa_query.trans_id,
1739 WLAN_SA_QUERY_TR_ID_LEN);
1741 ieee80211_tx_skb(sdata, skb, 1);
1744 static ieee80211_rx_result debug_noinline
1745 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1747 struct ieee80211_local *local = rx->local;
1748 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1749 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1750 struct ieee80211_bss *bss;
1751 int len = rx->skb->len;
1753 if (!ieee80211_is_action(mgmt->frame_control))
1757 return RX_DROP_MONITOR;
1759 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1760 return RX_DROP_MONITOR;
1762 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1763 return RX_DROP_MONITOR;
1765 /* all categories we currently handle have action_code */
1766 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1767 return RX_DROP_MONITOR;
1769 switch (mgmt->u.action.category) {
1770 case WLAN_CATEGORY_BACK:
1772 * The aggregation code is not prepared to handle
1773 * anything but STA/AP due to the BSSID handling;
1774 * IBSS could work in the code but isn't supported
1775 * by drivers or the standard.
1777 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1778 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1779 sdata->vif.type != NL80211_IFTYPE_AP)
1780 return RX_DROP_MONITOR;
1782 switch (mgmt->u.action.u.addba_req.action_code) {
1783 case WLAN_ACTION_ADDBA_REQ:
1784 if (len < (IEEE80211_MIN_ACTION_SIZE +
1785 sizeof(mgmt->u.action.u.addba_req)))
1786 return RX_DROP_MONITOR;
1787 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1789 case WLAN_ACTION_ADDBA_RESP:
1790 if (len < (IEEE80211_MIN_ACTION_SIZE +
1791 sizeof(mgmt->u.action.u.addba_resp)))
1792 return RX_DROP_MONITOR;
1793 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1795 case WLAN_ACTION_DELBA:
1796 if (len < (IEEE80211_MIN_ACTION_SIZE +
1797 sizeof(mgmt->u.action.u.delba)))
1798 return RX_DROP_MONITOR;
1799 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1803 case WLAN_CATEGORY_SPECTRUM_MGMT:
1804 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1805 return RX_DROP_MONITOR;
1807 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1808 return RX_DROP_MONITOR;
1810 switch (mgmt->u.action.u.measurement.action_code) {
1811 case WLAN_ACTION_SPCT_MSR_REQ:
1812 if (len < (IEEE80211_MIN_ACTION_SIZE +
1813 sizeof(mgmt->u.action.u.measurement)))
1814 return RX_DROP_MONITOR;
1815 ieee80211_process_measurement_req(sdata, mgmt, len);
1817 case WLAN_ACTION_SPCT_CHL_SWITCH:
1818 if (len < (IEEE80211_MIN_ACTION_SIZE +
1819 sizeof(mgmt->u.action.u.chan_switch)))
1820 return RX_DROP_MONITOR;
1822 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1823 return RX_DROP_MONITOR;
1825 bss = ieee80211_rx_bss_get(local, sdata->u.mgd.bssid,
1826 local->hw.conf.channel->center_freq,
1828 sdata->u.mgd.ssid_len);
1830 return RX_DROP_MONITOR;
1832 ieee80211_process_chanswitch(sdata,
1833 &mgmt->u.action.u.chan_switch.sw_elem, bss);
1834 ieee80211_rx_bss_put(local, bss);
1838 case WLAN_CATEGORY_SA_QUERY:
1839 if (len < (IEEE80211_MIN_ACTION_SIZE +
1840 sizeof(mgmt->u.action.u.sa_query)))
1841 return RX_DROP_MONITOR;
1842 switch (mgmt->u.action.u.sa_query.action) {
1843 case WLAN_ACTION_SA_QUERY_REQUEST:
1844 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1845 return RX_DROP_MONITOR;
1846 ieee80211_process_sa_query_req(sdata, mgmt, len);
1848 case WLAN_ACTION_SA_QUERY_RESPONSE:
1850 * SA Query response is currently only used in AP mode
1851 * and it is processed in user space.
1860 rx->sta->rx_packets++;
1861 dev_kfree_skb(rx->skb);
1865 static ieee80211_rx_result debug_noinline
1866 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1868 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1869 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1871 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1872 return RX_DROP_MONITOR;
1874 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1875 return RX_DROP_MONITOR;
1877 if (ieee80211_vif_is_mesh(&sdata->vif))
1878 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1880 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1881 return ieee80211_ibss_rx_mgmt(sdata, rx->skb, rx->status);
1883 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1884 return ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
1886 return RX_DROP_MONITOR;
1889 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1890 struct ieee80211_hdr *hdr,
1891 struct ieee80211_rx_data *rx)
1894 unsigned int hdrlen;
1896 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1897 if (rx->skb->len >= hdrlen + 4)
1898 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1904 * Some hardware seem to generate incorrect Michael MIC
1905 * reports; ignore them to avoid triggering countermeasures.
1910 if (!ieee80211_has_protected(hdr->frame_control))
1913 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1915 * APs with pairwise keys should never receive Michael MIC
1916 * errors for non-zero keyidx because these are reserved for
1917 * group keys and only the AP is sending real multicast
1918 * frames in the BSS.
1923 if (!ieee80211_is_data(hdr->frame_control) &&
1924 !ieee80211_is_auth(hdr->frame_control))
1927 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
1929 dev_kfree_skb(rx->skb);
1933 /* TODO: use IEEE80211_RX_FRAGMENTED */
1934 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1936 struct ieee80211_sub_if_data *sdata;
1937 struct ieee80211_local *local = rx->local;
1938 struct ieee80211_rtap_hdr {
1939 struct ieee80211_radiotap_header hdr;
1944 } __attribute__ ((packed)) *rthdr;
1945 struct sk_buff *skb = rx->skb, *skb2;
1946 struct net_device *prev_dev = NULL;
1947 struct ieee80211_rx_status *status = rx->status;
1949 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1952 if (skb_headroom(skb) < sizeof(*rthdr) &&
1953 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1956 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1957 memset(rthdr, 0, sizeof(*rthdr));
1958 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1959 rthdr->hdr.it_present =
1960 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1961 (1 << IEEE80211_RADIOTAP_RATE) |
1962 (1 << IEEE80211_RADIOTAP_CHANNEL));
1964 rthdr->rate = rx->rate->bitrate / 5;
1965 rthdr->chan_freq = cpu_to_le16(status->freq);
1967 if (status->band == IEEE80211_BAND_5GHZ)
1968 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1969 IEEE80211_CHAN_5GHZ);
1971 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1972 IEEE80211_CHAN_2GHZ);
1974 skb_set_mac_header(skb, 0);
1975 skb->ip_summed = CHECKSUM_UNNECESSARY;
1976 skb->pkt_type = PACKET_OTHERHOST;
1977 skb->protocol = htons(ETH_P_802_2);
1979 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1980 if (!netif_running(sdata->dev))
1983 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1984 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1988 skb2 = skb_clone(skb, GFP_ATOMIC);
1990 skb2->dev = prev_dev;
1995 prev_dev = sdata->dev;
1996 sdata->dev->stats.rx_packets++;
1997 sdata->dev->stats.rx_bytes += skb->len;
2001 skb->dev = prev_dev;
2007 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
2015 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
2016 struct ieee80211_rx_data *rx,
2017 struct sk_buff *skb)
2019 ieee80211_rx_result res = RX_DROP_MONITOR;
2023 rx->dev = sdata->dev;
2025 #define CALL_RXH(rxh) \
2028 if (res != RX_CONTINUE) \
2032 CALL_RXH(ieee80211_rx_h_passive_scan)
2033 CALL_RXH(ieee80211_rx_h_check)
2034 CALL_RXH(ieee80211_rx_h_decrypt)
2035 CALL_RXH(ieee80211_rx_h_check_more_data)
2036 CALL_RXH(ieee80211_rx_h_sta_process)
2037 CALL_RXH(ieee80211_rx_h_defragment)
2038 CALL_RXH(ieee80211_rx_h_ps_poll)
2039 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2040 /* must be after MMIC verify so header is counted in MPDU mic */
2041 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2042 CALL_RXH(ieee80211_rx_h_amsdu)
2043 #ifdef CONFIG_MAC80211_MESH
2044 if (ieee80211_vif_is_mesh(&sdata->vif))
2045 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2047 CALL_RXH(ieee80211_rx_h_data)
2048 CALL_RXH(ieee80211_rx_h_ctrl)
2049 CALL_RXH(ieee80211_rx_h_action)
2050 CALL_RXH(ieee80211_rx_h_mgmt)
2056 case RX_DROP_MONITOR:
2057 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2059 rx->sta->rx_dropped++;
2062 ieee80211_rx_cooked_monitor(rx);
2064 case RX_DROP_UNUSABLE:
2065 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2067 rx->sta->rx_dropped++;
2068 dev_kfree_skb(rx->skb);
2071 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2076 /* main receive path */
2078 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2079 struct ieee80211_rx_data *rx,
2080 struct ieee80211_hdr *hdr)
2082 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
2083 int multicast = is_multicast_ether_addr(hdr->addr1);
2085 switch (sdata->vif.type) {
2086 case NL80211_IFTYPE_STATION:
2089 if (!ieee80211_bssid_match(bssid, sdata->u.mgd.bssid)) {
2090 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2092 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2093 } else if (!multicast &&
2094 compare_ether_addr(sdata->dev->dev_addr,
2096 if (!(sdata->dev->flags & IFF_PROMISC))
2098 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2101 case NL80211_IFTYPE_ADHOC:
2104 if (ieee80211_is_beacon(hdr->frame_control)) {
2107 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2108 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2110 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2111 } else if (!multicast &&
2112 compare_ether_addr(sdata->dev->dev_addr,
2114 if (!(sdata->dev->flags & IFF_PROMISC))
2116 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2117 } else if (!rx->sta) {
2119 if (rx->status->flag & RX_FLAG_HT)
2120 rate_idx = 0; /* TODO: HT rates */
2122 rate_idx = rx->status->rate_idx;
2123 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2127 case NL80211_IFTYPE_MESH_POINT:
2129 compare_ether_addr(sdata->dev->dev_addr,
2131 if (!(sdata->dev->flags & IFF_PROMISC))
2134 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2137 case NL80211_IFTYPE_AP_VLAN:
2138 case NL80211_IFTYPE_AP:
2140 if (compare_ether_addr(sdata->dev->dev_addr,
2143 } else if (!ieee80211_bssid_match(bssid,
2144 sdata->dev->dev_addr)) {
2145 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2147 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2150 case NL80211_IFTYPE_WDS:
2151 if (bssid || !ieee80211_is_data(hdr->frame_control))
2153 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2156 case NL80211_IFTYPE_MONITOR:
2157 /* take everything */
2159 case NL80211_IFTYPE_UNSPECIFIED:
2160 case __NL80211_IFTYPE_AFTER_LAST:
2161 /* should never get here */
2170 * This is the actual Rx frames handler. as it blongs to Rx path it must
2171 * be called with rcu_read_lock protection.
2173 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2174 struct sk_buff *skb,
2175 struct ieee80211_rx_status *status,
2176 struct ieee80211_rate *rate)
2178 struct ieee80211_local *local = hw_to_local(hw);
2179 struct ieee80211_sub_if_data *sdata;
2180 struct ieee80211_hdr *hdr;
2181 struct ieee80211_rx_data rx;
2183 struct ieee80211_sub_if_data *prev = NULL;
2184 struct sk_buff *skb_new;
2186 hdr = (struct ieee80211_hdr *)skb->data;
2187 memset(&rx, 0, sizeof(rx));
2194 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2195 local->dot11ReceivedFragmentCount++;
2197 rx.sta = sta_info_get(local, hdr->addr2);
2199 rx.sdata = rx.sta->sdata;
2200 rx.dev = rx.sta->sdata->dev;
2203 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
2204 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
2208 if (unlikely(local->sw_scanning || local->hw_scanning))
2209 rx.flags |= IEEE80211_RX_IN_SCAN;
2211 ieee80211_parse_qos(&rx);
2212 ieee80211_verify_alignment(&rx);
2216 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2217 if (!netif_running(sdata->dev))
2220 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2223 rx.flags |= IEEE80211_RX_RA_MATCH;
2224 prepares = prepare_for_handlers(sdata, &rx, hdr);
2230 * frame is destined for this interface, but if it's not
2231 * also for the previous one we handle that after the
2232 * loop to avoid copying the SKB once too much
2241 * frame was destined for the previous interface
2242 * so invoke RX handlers for it
2245 skb_new = skb_copy(skb, GFP_ATOMIC);
2247 if (net_ratelimit())
2248 printk(KERN_DEBUG "%s: failed to copy "
2249 "multicast frame for %s\n",
2250 wiphy_name(local->hw.wiphy),
2254 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2258 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2263 #define SEQ_MODULO 0x1000
2264 #define SEQ_MASK 0xfff
2266 static inline int seq_less(u16 sq1, u16 sq2)
2268 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2271 static inline u16 seq_inc(u16 sq)
2273 return (sq + 1) & SEQ_MASK;
2276 static inline u16 seq_sub(u16 sq1, u16 sq2)
2278 return (sq1 - sq2) & SEQ_MASK;
2283 * As it function blongs to Rx path it must be called with
2284 * the proper rcu_read_lock protection for its flow.
2286 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2287 struct tid_ampdu_rx *tid_agg_rx,
2288 struct sk_buff *skb,
2292 struct ieee80211_local *local = hw_to_local(hw);
2293 struct ieee80211_rx_status status;
2294 u16 head_seq_num, buf_size;
2296 struct ieee80211_supported_band *sband;
2297 struct ieee80211_rate *rate;
2299 buf_size = tid_agg_rx->buf_size;
2300 head_seq_num = tid_agg_rx->head_seq_num;
2302 /* frame with out of date sequence number */
2303 if (seq_less(mpdu_seq_num, head_seq_num)) {
2308 /* if frame sequence number exceeds our buffering window size or
2309 * block Ack Request arrived - release stored frames */
2310 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2311 /* new head to the ordering buffer */
2313 head_seq_num = mpdu_seq_num;
2316 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2317 /* release stored frames up to new head to stack */
2318 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2319 index = seq_sub(tid_agg_rx->head_seq_num,
2321 % tid_agg_rx->buf_size;
2323 if (tid_agg_rx->reorder_buf[index]) {
2324 /* release the reordered frames to stack */
2326 tid_agg_rx->reorder_buf[index]->cb,
2328 sband = local->hw.wiphy->bands[status.band];
2329 if (status.flag & RX_FLAG_HT) {
2330 /* TODO: HT rates */
2331 rate = sband->bitrates;
2333 rate = &sband->bitrates
2336 __ieee80211_rx_handle_packet(hw,
2337 tid_agg_rx->reorder_buf[index],
2339 tid_agg_rx->stored_mpdu_num--;
2340 tid_agg_rx->reorder_buf[index] = NULL;
2342 tid_agg_rx->head_seq_num =
2343 seq_inc(tid_agg_rx->head_seq_num);
2349 /* now the new frame is always in the range of the reordering */
2351 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2352 % tid_agg_rx->buf_size;
2353 /* check if we already stored this frame */
2354 if (tid_agg_rx->reorder_buf[index]) {
2359 /* if arrived mpdu is in the right order and nothing else stored */
2360 /* release it immediately */
2361 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2362 tid_agg_rx->stored_mpdu_num == 0) {
2363 tid_agg_rx->head_seq_num =
2364 seq_inc(tid_agg_rx->head_seq_num);
2368 /* put the frame in the reordering buffer */
2369 tid_agg_rx->reorder_buf[index] = skb;
2370 tid_agg_rx->stored_mpdu_num++;
2371 /* release the buffer until next missing frame */
2372 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2373 % tid_agg_rx->buf_size;
2374 while (tid_agg_rx->reorder_buf[index]) {
2375 /* release the reordered frame back to stack */
2376 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2378 sband = local->hw.wiphy->bands[status.band];
2379 if (status.flag & RX_FLAG_HT)
2380 rate = sband->bitrates; /* TODO: HT rates */
2382 rate = &sband->bitrates[status.rate_idx];
2383 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2385 tid_agg_rx->stored_mpdu_num--;
2386 tid_agg_rx->reorder_buf[index] = NULL;
2387 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2388 index = seq_sub(tid_agg_rx->head_seq_num,
2389 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2394 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2395 struct sk_buff *skb)
2397 struct ieee80211_hw *hw = &local->hw;
2398 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2399 struct sta_info *sta;
2400 struct tid_ampdu_rx *tid_agg_rx;
2406 sta = sta_info_get(local, hdr->addr2);
2410 /* filter the QoS data rx stream according to
2411 * STA/TID and check if this STA/TID is on aggregation */
2412 if (!ieee80211_is_data_qos(hdr->frame_control))
2415 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2417 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2420 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2422 /* qos null data frames are excluded */
2423 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2426 /* new un-ordered ampdu frame - process it */
2428 /* reset session timer */
2429 if (tid_agg_rx->timeout)
2430 mod_timer(&tid_agg_rx->session_timer,
2431 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2433 /* if this mpdu is fragmented - terminate rx aggregation session */
2434 sc = le16_to_cpu(hdr->seq_ctrl);
2435 if (sc & IEEE80211_SCTL_FRAG) {
2436 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2437 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2442 /* according to mpdu sequence number deal with reordering buffer */
2443 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2444 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2451 * This is the receive path handler. It is called by a low level driver when an
2452 * 802.11 MPDU is received from the hardware.
2454 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2455 struct ieee80211_rx_status *status)
2457 struct ieee80211_local *local = hw_to_local(hw);
2458 struct ieee80211_rate *rate = NULL;
2459 struct ieee80211_supported_band *sband;
2461 if (status->band < 0 ||
2462 status->band >= IEEE80211_NUM_BANDS) {
2467 sband = local->hw.wiphy->bands[status->band];
2473 if (status->flag & RX_FLAG_HT) {
2474 /* rate_idx is MCS index */
2475 if (WARN_ON(status->rate_idx < 0 ||
2476 status->rate_idx >= 76))
2478 /* HT rates are not in the table - use the highest legacy rate
2479 * for now since other parts of mac80211 may not yet be fully
2481 rate = &sband->bitrates[sband->n_bitrates - 1];
2483 if (WARN_ON(status->rate_idx < 0 ||
2484 status->rate_idx >= sband->n_bitrates))
2486 rate = &sband->bitrates[status->rate_idx];
2490 * key references and virtual interfaces are protected using RCU
2491 * and this requires that we are in a read-side RCU section during
2492 * receive processing
2497 * Frames with failed FCS/PLCP checksum are not returned,
2498 * all other frames are returned without radiotap header
2499 * if it was previously present.
2500 * Also, frames with less than 16 bytes are dropped.
2502 skb = ieee80211_rx_monitor(local, skb, status, rate);
2508 if (!ieee80211_rx_reorder_ampdu(local, skb))
2509 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2513 EXPORT_SYMBOL(__ieee80211_rx);
2515 /* This is a version of the rx handler that can be called from hard irq
2516 * context. Post the skb on the queue and schedule the tasklet */
2517 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2518 struct ieee80211_rx_status *status)
2520 struct ieee80211_local *local = hw_to_local(hw);
2522 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2524 skb->dev = local->mdev;
2525 /* copy status into skb->cb for use by tasklet */
2526 memcpy(skb->cb, status, sizeof(*status));
2527 skb->pkt_type = IEEE80211_RX_MSG;
2528 skb_queue_tail(&local->skb_queue, skb);
2529 tasklet_schedule(&local->tasklet);
2531 EXPORT_SYMBOL(ieee80211_rx_irqsafe);