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 2007-2010 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/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
32 * monitor mode reception
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
37 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
42 __pskb_trim(skb, skb->len - FCS_LEN);
54 static inline int should_drop_frame(struct sk_buff *skb,
57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
62 if (unlikely(skb->len < 16 + present_fcs_len))
64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
72 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
80 if (status->flag & RX_FLAG_TSFT)
82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
85 if (len & 1) /* padding for RX_FLAGS if necessary */
92 * ieee80211_add_rx_radiotap_header - add radiotap header
94 * add a radiotap header containing all the fields which the hardware provided.
97 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
99 struct ieee80211_rate *rate,
102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
103 struct ieee80211_radiotap_header *rthdr;
107 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
108 memset(rthdr, 0, rtap_len);
110 /* radiotap header, set always present flags */
112 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
113 (1 << IEEE80211_RADIOTAP_CHANNEL) |
114 (1 << IEEE80211_RADIOTAP_ANTENNA) |
115 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
116 rthdr->it_len = cpu_to_le16(rtap_len);
118 pos = (unsigned char *)(rthdr+1);
120 /* the order of the following fields is important */
122 /* IEEE80211_RADIOTAP_TSFT */
123 if (status->flag & RX_FLAG_TSFT) {
124 put_unaligned_le64(status->mactime, pos);
126 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
130 /* IEEE80211_RADIOTAP_FLAGS */
131 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
132 *pos |= IEEE80211_RADIOTAP_F_FCS;
133 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
134 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
135 if (status->flag & RX_FLAG_SHORTPRE)
136 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
139 /* IEEE80211_RADIOTAP_RATE */
140 if (status->flag & RX_FLAG_HT) {
142 * TODO: add following information into radiotap header once
143 * suitable fields are defined for it:
144 * - MCS index (status->rate_idx)
145 * - HT40 (status->flag & RX_FLAG_40MHZ)
146 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
150 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
151 *pos = rate->bitrate / 5;
155 /* IEEE80211_RADIOTAP_CHANNEL */
156 put_unaligned_le16(status->freq, pos);
158 if (status->band == IEEE80211_BAND_5GHZ)
159 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
161 else if (status->flag & RX_FLAG_HT)
162 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
164 else if (rate->flags & IEEE80211_RATE_ERP_G)
165 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
168 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
172 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
174 *pos = status->signal;
176 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
180 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
182 /* IEEE80211_RADIOTAP_ANTENNA */
183 *pos = status->antenna;
186 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
188 /* IEEE80211_RADIOTAP_RX_FLAGS */
189 /* ensure 2 byte alignment for the 2 byte field as required */
190 if ((pos - (u8 *)rthdr) & 1)
192 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
193 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
194 put_unaligned_le16(rx_flags, pos);
199 * This function copies a received frame to all monitor interfaces and
200 * returns a cleaned-up SKB that no longer includes the FCS nor the
201 * radiotap header the driver might have added.
203 static struct sk_buff *
204 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
205 struct ieee80211_rate *rate)
207 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
208 struct ieee80211_sub_if_data *sdata;
209 int needed_headroom = 0;
210 struct sk_buff *skb, *skb2;
211 struct net_device *prev_dev = NULL;
212 int present_fcs_len = 0;
215 * First, we may need to make a copy of the skb because
216 * (1) we need to modify it for radiotap (if not present), and
217 * (2) the other RX handlers will modify the skb we got.
219 * We don't need to, of course, if we aren't going to return
220 * the SKB because it has a bad FCS/PLCP checksum.
223 /* room for the radiotap header based on driver features */
224 needed_headroom = ieee80211_rx_radiotap_len(local, status);
226 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
227 present_fcs_len = FCS_LEN;
229 /* make sure hdr->frame_control is on the linear part */
230 if (!pskb_may_pull(origskb, 2)) {
231 dev_kfree_skb(origskb);
235 if (!local->monitors) {
236 if (should_drop_frame(origskb, present_fcs_len)) {
237 dev_kfree_skb(origskb);
241 return remove_monitor_info(local, origskb);
244 if (should_drop_frame(origskb, present_fcs_len)) {
245 /* only need to expand headroom if necessary */
250 * This shouldn't trigger often because most devices have an
251 * RX header they pull before we get here, and that should
252 * be big enough for our radiotap information. We should
253 * probably export the length to drivers so that we can have
254 * them allocate enough headroom to start with.
256 if (skb_headroom(skb) < needed_headroom &&
257 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
263 * Need to make a copy and possibly remove radiotap header
264 * and FCS from the original.
266 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
268 origskb = remove_monitor_info(local, origskb);
274 /* prepend radiotap information */
275 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
277 skb_reset_mac_header(skb);
278 skb->ip_summed = CHECKSUM_UNNECESSARY;
279 skb->pkt_type = PACKET_OTHERHOST;
280 skb->protocol = htons(ETH_P_802_2);
282 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
283 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
286 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
289 if (!ieee80211_sdata_running(sdata))
293 skb2 = skb_clone(skb, GFP_ATOMIC);
295 skb2->dev = prev_dev;
296 netif_receive_skb(skb2);
300 prev_dev = sdata->dev;
301 sdata->dev->stats.rx_packets++;
302 sdata->dev->stats.rx_bytes += skb->len;
307 netif_receive_skb(skb);
315 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
320 /* does the frame have a qos control field? */
321 if (ieee80211_is_data_qos(hdr->frame_control)) {
322 u8 *qc = ieee80211_get_qos_ctl(hdr);
323 /* frame has qos control */
324 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
325 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
326 rx->flags |= IEEE80211_RX_AMSDU;
328 rx->flags &= ~IEEE80211_RX_AMSDU;
331 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
333 * Sequence numbers for management frames, QoS data
334 * frames with a broadcast/multicast address in the
335 * Address 1 field, and all non-QoS data frames sent
336 * by QoS STAs are assigned using an additional single
337 * modulo-4096 counter, [...]
339 * We also use that counter for non-QoS STAs.
341 tid = NUM_RX_DATA_QUEUES - 1;
345 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
346 * For now, set skb->priority to 0 for other cases. */
347 rx->skb->priority = (tid > 7) ? 0 : tid;
351 * DOC: Packet alignment
353 * Drivers always need to pass packets that are aligned to two-byte boundaries
356 * Additionally, should, if possible, align the payload data in a way that
357 * guarantees that the contained IP header is aligned to a four-byte
358 * boundary. In the case of regular frames, this simply means aligning the
359 * payload to a four-byte boundary (because either the IP header is directly
360 * contained, or IV/RFC1042 headers that have a length divisible by four are
361 * in front of it). If the payload data is not properly aligned and the
362 * architecture doesn't support efficient unaligned operations, mac80211
363 * will align the data.
365 * With A-MSDU frames, however, the payload data address must yield two modulo
366 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
367 * push the IP header further back to a multiple of four again. Thankfully, the
368 * specs were sane enough this time around to require padding each A-MSDU
369 * subframe to a length that is a multiple of four.
371 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
372 * the payload is not supported, the driver is required to move the 802.11
373 * header to be directly in front of the payload in that case.
375 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
377 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
378 WARN_ONCE((unsigned long)rx->skb->data & 1,
379 "unaligned packet at 0x%p\n", rx->skb->data);
386 static ieee80211_rx_result debug_noinline
387 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
389 struct ieee80211_local *local = rx->local;
390 struct sk_buff *skb = rx->skb;
392 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
393 return ieee80211_scan_rx(rx->sdata, skb);
395 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
396 (rx->flags & IEEE80211_RX_IN_SCAN))) {
397 /* drop all the other packets during a software scan anyway */
398 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
403 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
404 /* scanning finished during invoking of handlers */
405 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
406 return RX_DROP_UNUSABLE;
413 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
415 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
417 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
420 return ieee80211_is_robust_mgmt_frame(hdr);
424 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
426 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
428 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
431 return ieee80211_is_robust_mgmt_frame(hdr);
435 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
436 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
438 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
439 struct ieee80211_mmie *mmie;
441 if (skb->len < 24 + sizeof(*mmie) ||
442 !is_multicast_ether_addr(hdr->da))
445 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
446 return -1; /* not a robust management frame */
448 mmie = (struct ieee80211_mmie *)
449 (skb->data + skb->len - sizeof(*mmie));
450 if (mmie->element_id != WLAN_EID_MMIE ||
451 mmie->length != sizeof(*mmie) - 2)
454 return le16_to_cpu(mmie->key_id);
458 static ieee80211_rx_result
459 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
461 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
462 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
463 char *dev_addr = rx->sdata->vif.addr;
465 if (ieee80211_is_data(hdr->frame_control)) {
466 if (is_multicast_ether_addr(hdr->addr1)) {
467 if (ieee80211_has_tods(hdr->frame_control) ||
468 !ieee80211_has_fromds(hdr->frame_control))
469 return RX_DROP_MONITOR;
470 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
471 return RX_DROP_MONITOR;
473 if (!ieee80211_has_a4(hdr->frame_control))
474 return RX_DROP_MONITOR;
475 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
476 return RX_DROP_MONITOR;
480 /* If there is not an established peer link and this is not a peer link
481 * establisment frame, beacon or probe, drop the frame.
484 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
485 struct ieee80211_mgmt *mgmt;
487 if (!ieee80211_is_mgmt(hdr->frame_control))
488 return RX_DROP_MONITOR;
490 if (ieee80211_is_action(hdr->frame_control)) {
491 mgmt = (struct ieee80211_mgmt *)hdr;
492 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
493 return RX_DROP_MONITOR;
497 if (ieee80211_is_probe_req(hdr->frame_control) ||
498 ieee80211_is_probe_resp(hdr->frame_control) ||
499 ieee80211_is_beacon(hdr->frame_control))
502 return RX_DROP_MONITOR;
506 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
508 if (ieee80211_is_data(hdr->frame_control) &&
509 is_multicast_ether_addr(hdr->addr1) &&
510 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
511 return RX_DROP_MONITOR;
517 #define SEQ_MODULO 0x1000
518 #define SEQ_MASK 0xfff
520 static inline int seq_less(u16 sq1, u16 sq2)
522 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
525 static inline u16 seq_inc(u16 sq)
527 return (sq + 1) & SEQ_MASK;
530 static inline u16 seq_sub(u16 sq1, u16 sq2)
532 return (sq1 - sq2) & SEQ_MASK;
536 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
537 struct tid_ampdu_rx *tid_agg_rx,
539 struct sk_buff_head *frames)
541 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
546 /* release the frame from the reorder ring buffer */
547 tid_agg_rx->stored_mpdu_num--;
548 tid_agg_rx->reorder_buf[index] = NULL;
549 __skb_queue_tail(frames, skb);
552 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
555 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
556 struct tid_ampdu_rx *tid_agg_rx,
558 struct sk_buff_head *frames)
562 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
563 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
564 tid_agg_rx->buf_size;
565 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
570 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
571 * the skb was added to the buffer longer than this time ago, the earlier
572 * frames that have not yet been received are assumed to be lost and the skb
573 * can be released for processing. This may also release other skb's from the
574 * reorder buffer if there are no additional gaps between the frames.
576 * Callers must hold tid_agg_rx->reorder_lock.
578 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
580 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
581 struct tid_ampdu_rx *tid_agg_rx,
582 struct sk_buff_head *frames)
586 /* release the buffer until next missing frame */
587 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
588 tid_agg_rx->buf_size;
589 if (!tid_agg_rx->reorder_buf[index] &&
590 tid_agg_rx->stored_mpdu_num > 1) {
592 * No buffers ready to be released, but check whether any
593 * frames in the reorder buffer have timed out.
596 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
597 j = (j + 1) % tid_agg_rx->buf_size) {
598 if (!tid_agg_rx->reorder_buf[j]) {
602 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
603 HT_RX_REORDER_BUF_TIMEOUT))
604 goto set_release_timer;
606 #ifdef CONFIG_MAC80211_HT_DEBUG
608 printk(KERN_DEBUG "%s: release an RX reorder "
609 "frame due to timeout on earlier "
611 wiphy_name(hw->wiphy));
613 ieee80211_release_reorder_frame(hw, tid_agg_rx,
617 * Increment the head seq# also for the skipped slots.
619 tid_agg_rx->head_seq_num =
620 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
623 } else while (tid_agg_rx->reorder_buf[index]) {
624 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
625 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
626 tid_agg_rx->buf_size;
629 if (tid_agg_rx->stored_mpdu_num) {
630 j = index = seq_sub(tid_agg_rx->head_seq_num,
631 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
633 for (; j != (index - 1) % tid_agg_rx->buf_size;
634 j = (j + 1) % tid_agg_rx->buf_size) {
635 if (tid_agg_rx->reorder_buf[j])
641 mod_timer(&tid_agg_rx->reorder_timer,
642 tid_agg_rx->reorder_time[j] +
643 HT_RX_REORDER_BUF_TIMEOUT);
645 del_timer(&tid_agg_rx->reorder_timer);
650 * As this function belongs to the RX path it must be under
651 * rcu_read_lock protection. It returns false if the frame
652 * can be processed immediately, true if it was consumed.
654 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
655 struct tid_ampdu_rx *tid_agg_rx,
657 struct sk_buff_head *frames)
659 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660 u16 sc = le16_to_cpu(hdr->seq_ctrl);
661 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
662 u16 head_seq_num, buf_size;
666 buf_size = tid_agg_rx->buf_size;
667 head_seq_num = tid_agg_rx->head_seq_num;
669 spin_lock(&tid_agg_rx->reorder_lock);
670 /* frame with out of date sequence number */
671 if (seq_less(mpdu_seq_num, head_seq_num)) {
677 * If frame the sequence number exceeds our buffering window
678 * size release some previous frames to make room for this one.
680 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
681 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
682 /* release stored frames up to new head to stack */
683 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
687 /* Now the new frame is always in the range of the reordering buffer */
689 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
691 /* check if we already stored this frame */
692 if (tid_agg_rx->reorder_buf[index]) {
698 * If the current MPDU is in the right order and nothing else
699 * is stored we can process it directly, no need to buffer it.
701 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
702 tid_agg_rx->stored_mpdu_num == 0) {
703 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
708 /* put the frame in the reordering buffer */
709 tid_agg_rx->reorder_buf[index] = skb;
710 tid_agg_rx->reorder_time[index] = jiffies;
711 tid_agg_rx->stored_mpdu_num++;
712 ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
715 spin_unlock(&tid_agg_rx->reorder_lock);
720 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
721 * true if the MPDU was buffered, false if it should be processed.
723 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
724 struct sk_buff_head *frames)
726 struct sk_buff *skb = rx->skb;
727 struct ieee80211_local *local = rx->local;
728 struct ieee80211_hw *hw = &local->hw;
729 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
730 struct sta_info *sta = rx->sta;
731 struct tid_ampdu_rx *tid_agg_rx;
735 if (!ieee80211_is_data_qos(hdr->frame_control))
739 * filter the QoS data rx stream according to
740 * STA/TID and check if this STA/TID is on aggregation
746 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
748 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
752 /* qos null data frames are excluded */
753 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
756 /* new, potentially un-ordered, ampdu frame - process it */
758 /* reset session timer */
759 if (tid_agg_rx->timeout)
760 mod_timer(&tid_agg_rx->session_timer,
761 TU_TO_EXP_TIME(tid_agg_rx->timeout));
763 /* if this mpdu is fragmented - terminate rx aggregation session */
764 sc = le16_to_cpu(hdr->seq_ctrl);
765 if (sc & IEEE80211_SCTL_FRAG) {
766 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
767 skb_queue_tail(&rx->sdata->skb_queue, skb);
768 ieee80211_queue_work(&local->hw, &rx->sdata->work);
773 * No locking needed -- we will only ever process one
774 * RX packet at a time, and thus own tid_agg_rx. All
775 * other code manipulating it needs to (and does) make
776 * sure that we cannot get to it any more before doing
779 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
783 __skb_queue_tail(frames, skb);
786 static ieee80211_rx_result debug_noinline
787 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
789 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
791 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
792 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
793 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
794 rx->sta->last_seq_ctrl[rx->queue] ==
796 if (rx->flags & IEEE80211_RX_RA_MATCH) {
797 rx->local->dot11FrameDuplicateCount++;
798 rx->sta->num_duplicates++;
800 return RX_DROP_MONITOR;
802 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
805 if (unlikely(rx->skb->len < 16)) {
806 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
807 return RX_DROP_MONITOR;
810 /* Drop disallowed frame classes based on STA auth/assoc state;
811 * IEEE 802.11, Chap 5.5.
813 * mac80211 filters only based on association state, i.e. it drops
814 * Class 3 frames from not associated stations. hostapd sends
815 * deauth/disassoc frames when needed. In addition, hostapd is
816 * responsible for filtering on both auth and assoc states.
819 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
820 return ieee80211_rx_mesh_check(rx);
822 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
823 ieee80211_is_pspoll(hdr->frame_control)) &&
824 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
825 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
826 if ((!ieee80211_has_fromds(hdr->frame_control) &&
827 !ieee80211_has_tods(hdr->frame_control) &&
828 ieee80211_is_data(hdr->frame_control)) ||
829 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
830 /* Drop IBSS frames and frames for other hosts
832 return RX_DROP_MONITOR;
835 return RX_DROP_MONITOR;
842 static ieee80211_rx_result debug_noinline
843 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
845 struct sk_buff *skb = rx->skb;
846 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
847 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
850 ieee80211_rx_result result = RX_DROP_UNUSABLE;
851 struct ieee80211_key *stakey = NULL;
852 int mmie_keyidx = -1;
858 * There are four types of keys:
860 * - IGTK (group keys for management frames)
861 * - PTK (pairwise keys)
862 * - STK (station-to-station pairwise keys)
864 * When selecting a key, we have to distinguish between multicast
865 * (including broadcast) and unicast frames, the latter can only
866 * use PTKs and STKs while the former always use GTKs and IGTKs.
867 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
868 * unicast frames can also use key indices like GTKs. Hence, if we
869 * don't have a PTK/STK we check the key index for a WEP key.
871 * Note that in a regular BSS, multicast frames are sent by the
872 * AP only, associated stations unicast the frame to the AP first
873 * which then multicasts it on their behalf.
875 * There is also a slight problem in IBSS mode: GTKs are negotiated
876 * with each station, that is something we don't currently handle.
877 * The spec seems to expect that one negotiates the same key with
878 * every station but there's no such requirement; VLANs could be
883 * No point in finding a key and decrypting if the frame is neither
884 * addressed to us nor a multicast frame.
886 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
889 /* start without a key */
893 stakey = rcu_dereference(rx->sta->key);
895 fc = hdr->frame_control;
897 if (!ieee80211_has_protected(fc))
898 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
900 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
902 if ((status->flag & RX_FLAG_DECRYPTED) &&
903 (status->flag & RX_FLAG_IV_STRIPPED))
905 /* Skip decryption if the frame is not protected. */
906 if (!ieee80211_has_protected(fc))
908 } else if (mmie_keyidx >= 0) {
909 /* Broadcast/multicast robust management frame / BIP */
910 if ((status->flag & RX_FLAG_DECRYPTED) &&
911 (status->flag & RX_FLAG_IV_STRIPPED))
914 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
915 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
916 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
917 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
918 } else if (!ieee80211_has_protected(fc)) {
920 * The frame was not protected, so skip decryption. However, we
921 * need to set rx->key if there is a key that could have been
922 * used so that the frame may be dropped if encryption would
923 * have been expected.
925 struct ieee80211_key *key = NULL;
926 if (ieee80211_is_mgmt(fc) &&
927 is_multicast_ether_addr(hdr->addr1) &&
928 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
930 else if ((key = rcu_dereference(rx->sdata->default_key)))
936 * The device doesn't give us the IV so we won't be
937 * able to look up the key. That's ok though, we
938 * don't need to decrypt the frame, we just won't
939 * be able to keep statistics accurate.
940 * Except for key threshold notifications, should
941 * we somehow allow the driver to tell us which key
942 * the hardware used if this flag is set?
944 if ((status->flag & RX_FLAG_DECRYPTED) &&
945 (status->flag & RX_FLAG_IV_STRIPPED))
948 hdrlen = ieee80211_hdrlen(fc);
950 if (rx->skb->len < 8 + hdrlen)
951 return RX_DROP_UNUSABLE; /* TODO: count this? */
954 * no need to call ieee80211_wep_get_keyidx,
955 * it verifies a bunch of things we've done already
957 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
960 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
963 * RSNA-protected unicast frames should always be sent with
964 * pairwise or station-to-station keys, but for WEP we allow
965 * using a key index as well.
967 if (rx->key && rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
968 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
969 !is_multicast_ether_addr(hdr->addr1))
974 rx->key->tx_rx_count++;
975 /* TODO: add threshold stuff again */
977 return RX_DROP_MONITOR;
980 if (skb_linearize(rx->skb))
981 return RX_DROP_UNUSABLE;
982 /* the hdr variable is invalid now! */
984 switch (rx->key->conf.cipher) {
985 case WLAN_CIPHER_SUITE_WEP40:
986 case WLAN_CIPHER_SUITE_WEP104:
987 /* Check for weak IVs if possible */
988 if (rx->sta && ieee80211_is_data(fc) &&
989 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
990 !(status->flag & RX_FLAG_DECRYPTED)) &&
991 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
992 rx->sta->wep_weak_iv_count++;
994 result = ieee80211_crypto_wep_decrypt(rx);
996 case WLAN_CIPHER_SUITE_TKIP:
997 result = ieee80211_crypto_tkip_decrypt(rx);
999 case WLAN_CIPHER_SUITE_CCMP:
1000 result = ieee80211_crypto_ccmp_decrypt(rx);
1002 case WLAN_CIPHER_SUITE_AES_CMAC:
1003 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1007 /* either the frame has been decrypted or will be dropped */
1008 status->flag |= RX_FLAG_DECRYPTED;
1013 static ieee80211_rx_result debug_noinline
1014 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1016 struct ieee80211_local *local;
1017 struct ieee80211_hdr *hdr;
1018 struct sk_buff *skb;
1022 hdr = (struct ieee80211_hdr *) skb->data;
1024 if (!local->pspolling)
1027 if (!ieee80211_has_fromds(hdr->frame_control))
1028 /* this is not from AP */
1031 if (!ieee80211_is_data(hdr->frame_control))
1034 if (!ieee80211_has_moredata(hdr->frame_control)) {
1035 /* AP has no more frames buffered for us */
1036 local->pspolling = false;
1040 /* more data bit is set, let's request a new frame from the AP */
1041 ieee80211_send_pspoll(local, rx->sdata);
1046 static void ap_sta_ps_start(struct sta_info *sta)
1048 struct ieee80211_sub_if_data *sdata = sta->sdata;
1049 struct ieee80211_local *local = sdata->local;
1051 atomic_inc(&sdata->bss->num_sta_ps);
1052 set_sta_flags(sta, WLAN_STA_PS_STA);
1053 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1054 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1055 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1056 sdata->name, sta->sta.addr, sta->sta.aid);
1057 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1060 static void ap_sta_ps_end(struct sta_info *sta)
1062 struct ieee80211_sub_if_data *sdata = sta->sdata;
1064 atomic_dec(&sdata->bss->num_sta_ps);
1066 clear_sta_flags(sta, WLAN_STA_PS_STA);
1068 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1069 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1070 sdata->name, sta->sta.addr, sta->sta.aid);
1071 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1073 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
1074 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1075 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1076 sdata->name, sta->sta.addr, sta->sta.aid);
1077 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1081 ieee80211_sta_ps_deliver_wakeup(sta);
1084 static ieee80211_rx_result debug_noinline
1085 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1087 struct sta_info *sta = rx->sta;
1088 struct sk_buff *skb = rx->skb;
1089 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1090 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1096 * Update last_rx only for IBSS packets which are for the current
1097 * BSSID to avoid keeping the current IBSS network alive in cases
1098 * where other STAs start using different BSSID.
1100 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1101 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1102 NL80211_IFTYPE_ADHOC);
1103 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
1104 sta->last_rx = jiffies;
1105 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1107 * Mesh beacons will update last_rx when if they are found to
1108 * match the current local configuration when processed.
1110 sta->last_rx = jiffies;
1113 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1116 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1117 ieee80211_sta_rx_notify(rx->sdata, hdr);
1119 sta->rx_fragments++;
1120 sta->rx_bytes += rx->skb->len;
1121 sta->last_signal = status->signal;
1124 * Change STA power saving mode only at the end of a frame
1125 * exchange sequence.
1127 if (!ieee80211_has_morefrags(hdr->frame_control) &&
1128 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1129 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1130 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
1132 * Ignore doze->wake transitions that are
1133 * indicated by non-data frames, the standard
1134 * is unclear here, but for example going to
1135 * PS mode and then scanning would cause a
1136 * doze->wake transition for the probe request,
1137 * and that is clearly undesirable.
1139 if (ieee80211_is_data(hdr->frame_control) &&
1140 !ieee80211_has_pm(hdr->frame_control))
1143 if (ieee80211_has_pm(hdr->frame_control))
1144 ap_sta_ps_start(sta);
1149 * Drop (qos-)data::nullfunc frames silently, since they
1150 * are used only to control station power saving mode.
1152 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1153 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1154 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1157 * If we receive a 4-addr nullfunc frame from a STA
1158 * that was not moved to a 4-addr STA vlan yet, drop
1159 * the frame to the monitor interface, to make sure
1160 * that hostapd sees it
1162 if (ieee80211_has_a4(hdr->frame_control) &&
1163 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1164 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1165 !rx->sdata->u.vlan.sta)))
1166 return RX_DROP_MONITOR;
1168 * Update counter and free packet here to avoid
1169 * counting this as a dropped packed.
1172 dev_kfree_skb(rx->skb);
1177 } /* ieee80211_rx_h_sta_process */
1179 static inline struct ieee80211_fragment_entry *
1180 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1181 unsigned int frag, unsigned int seq, int rx_queue,
1182 struct sk_buff **skb)
1184 struct ieee80211_fragment_entry *entry;
1187 idx = sdata->fragment_next;
1188 entry = &sdata->fragments[sdata->fragment_next++];
1189 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1190 sdata->fragment_next = 0;
1192 if (!skb_queue_empty(&entry->skb_list)) {
1193 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1194 struct ieee80211_hdr *hdr =
1195 (struct ieee80211_hdr *) entry->skb_list.next->data;
1196 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1197 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1198 "addr1=%pM addr2=%pM\n",
1200 jiffies - entry->first_frag_time, entry->seq,
1201 entry->last_frag, hdr->addr1, hdr->addr2);
1203 __skb_queue_purge(&entry->skb_list);
1206 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1208 entry->first_frag_time = jiffies;
1210 entry->rx_queue = rx_queue;
1211 entry->last_frag = frag;
1213 entry->extra_len = 0;
1218 static inline struct ieee80211_fragment_entry *
1219 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1220 unsigned int frag, unsigned int seq,
1221 int rx_queue, struct ieee80211_hdr *hdr)
1223 struct ieee80211_fragment_entry *entry;
1226 idx = sdata->fragment_next;
1227 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1228 struct ieee80211_hdr *f_hdr;
1232 idx = IEEE80211_FRAGMENT_MAX - 1;
1234 entry = &sdata->fragments[idx];
1235 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1236 entry->rx_queue != rx_queue ||
1237 entry->last_frag + 1 != frag)
1240 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1243 * Check ftype and addresses are equal, else check next fragment
1245 if (((hdr->frame_control ^ f_hdr->frame_control) &
1246 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1247 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1248 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1251 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1252 __skb_queue_purge(&entry->skb_list);
1261 static ieee80211_rx_result debug_noinline
1262 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1264 struct ieee80211_hdr *hdr;
1267 unsigned int frag, seq;
1268 struct ieee80211_fragment_entry *entry;
1269 struct sk_buff *skb;
1271 hdr = (struct ieee80211_hdr *)rx->skb->data;
1272 fc = hdr->frame_control;
1273 sc = le16_to_cpu(hdr->seq_ctrl);
1274 frag = sc & IEEE80211_SCTL_FRAG;
1276 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1277 (rx->skb)->len < 24 ||
1278 is_multicast_ether_addr(hdr->addr1))) {
1279 /* not fragmented */
1282 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1284 if (skb_linearize(rx->skb))
1285 return RX_DROP_UNUSABLE;
1288 * skb_linearize() might change the skb->data and
1289 * previously cached variables (in this case, hdr) need to
1290 * be refreshed with the new data.
1292 hdr = (struct ieee80211_hdr *)rx->skb->data;
1293 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1296 /* This is the first fragment of a new frame. */
1297 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1298 rx->queue, &(rx->skb));
1299 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1300 ieee80211_has_protected(fc)) {
1301 int queue = ieee80211_is_mgmt(fc) ?
1302 NUM_RX_DATA_QUEUES : rx->queue;
1303 /* Store CCMP PN so that we can verify that the next
1304 * fragment has a sequential PN value. */
1306 memcpy(entry->last_pn,
1307 rx->key->u.ccmp.rx_pn[queue],
1313 /* This is a fragment for a frame that should already be pending in
1314 * fragment cache. Add this fragment to the end of the pending entry.
1316 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1318 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1319 return RX_DROP_MONITOR;
1322 /* Verify that MPDUs within one MSDU have sequential PN values.
1323 * (IEEE 802.11i, 8.3.3.4.5) */
1326 u8 pn[CCMP_PN_LEN], *rpn;
1328 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1329 return RX_DROP_UNUSABLE;
1330 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1331 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1336 queue = ieee80211_is_mgmt(fc) ?
1337 NUM_RX_DATA_QUEUES : rx->queue;
1338 rpn = rx->key->u.ccmp.rx_pn[queue];
1339 if (memcmp(pn, rpn, CCMP_PN_LEN))
1340 return RX_DROP_UNUSABLE;
1341 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1344 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1345 __skb_queue_tail(&entry->skb_list, rx->skb);
1346 entry->last_frag = frag;
1347 entry->extra_len += rx->skb->len;
1348 if (ieee80211_has_morefrags(fc)) {
1353 rx->skb = __skb_dequeue(&entry->skb_list);
1354 if (skb_tailroom(rx->skb) < entry->extra_len) {
1355 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1356 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1358 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1359 __skb_queue_purge(&entry->skb_list);
1360 return RX_DROP_UNUSABLE;
1363 while ((skb = __skb_dequeue(&entry->skb_list))) {
1364 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1368 /* Complete frame has been reassembled - process it now */
1369 rx->flags |= IEEE80211_RX_FRAGMENTED;
1373 rx->sta->rx_packets++;
1374 if (is_multicast_ether_addr(hdr->addr1))
1375 rx->local->dot11MulticastReceivedFrameCount++;
1377 ieee80211_led_rx(rx->local);
1381 static ieee80211_rx_result debug_noinline
1382 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1384 struct ieee80211_sub_if_data *sdata = rx->sdata;
1385 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1387 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1388 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1391 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1392 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1393 return RX_DROP_UNUSABLE;
1395 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1396 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1398 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1400 /* Free PS Poll skb here instead of returning RX_DROP that would
1401 * count as an dropped frame. */
1402 dev_kfree_skb(rx->skb);
1407 static ieee80211_rx_result debug_noinline
1408 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1410 u8 *data = rx->skb->data;
1411 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1413 if (!ieee80211_is_data_qos(hdr->frame_control))
1416 /* remove the qos control field, update frame type and meta-data */
1417 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1418 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1419 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1420 /* change frame type to non QOS */
1421 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1427 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1429 if (unlikely(!rx->sta ||
1430 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1437 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1439 struct sk_buff *skb = rx->skb;
1440 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1443 * Pass through unencrypted frames if the hardware has
1444 * decrypted them already.
1446 if (status->flag & RX_FLAG_DECRYPTED)
1449 /* Drop unencrypted frames if key is set. */
1450 if (unlikely(!ieee80211_has_protected(fc) &&
1451 !ieee80211_is_nullfunc(fc) &&
1452 ieee80211_is_data(fc) &&
1453 (rx->key || rx->sdata->drop_unencrypted)))
1460 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1462 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1463 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1464 __le16 fc = hdr->frame_control;
1467 * Pass through unencrypted frames if the hardware has
1468 * decrypted them already.
1470 if (status->flag & RX_FLAG_DECRYPTED)
1473 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1474 if (unlikely(!ieee80211_has_protected(fc) &&
1475 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1478 /* BIP does not use Protected field, so need to check MMIE */
1479 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1480 ieee80211_get_mmie_keyidx(rx->skb) < 0))
1483 * When using MFP, Action frames are not allowed prior to
1484 * having configured keys.
1486 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1487 ieee80211_is_robust_mgmt_frame(
1488 (struct ieee80211_hdr *) rx->skb->data)))
1496 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1498 struct ieee80211_sub_if_data *sdata = rx->sdata;
1499 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1501 if (ieee80211_has_a4(hdr->frame_control) &&
1502 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1505 if (is_multicast_ether_addr(hdr->addr1) &&
1506 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1507 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
1510 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1514 * requires that rx->skb is a frame with ethernet header
1516 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1518 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1519 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1520 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1523 * Allow EAPOL frames to us/the PAE group address regardless
1524 * of whether the frame was encrypted or not.
1526 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1527 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1528 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1531 if (ieee80211_802_1x_port_control(rx) ||
1532 ieee80211_drop_unencrypted(rx, fc))
1539 * requires that rx->skb is a frame with ethernet header
1542 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1544 struct ieee80211_sub_if_data *sdata = rx->sdata;
1545 struct net_device *dev = sdata->dev;
1546 struct sk_buff *skb, *xmit_skb;
1547 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1548 struct sta_info *dsta;
1553 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1554 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1555 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1556 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1557 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1558 if (is_multicast_ether_addr(ehdr->h_dest)) {
1560 * send multicast frames both to higher layers in
1561 * local net stack and back to the wireless medium
1563 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1564 if (!xmit_skb && net_ratelimit())
1565 printk(KERN_DEBUG "%s: failed to clone "
1566 "multicast frame\n", dev->name);
1568 dsta = sta_info_get(sdata, skb->data);
1571 * The destination station is associated to
1572 * this AP (in this VLAN), so send the frame
1573 * directly to it and do not pass it to local
1583 int align __maybe_unused;
1585 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1587 * 'align' will only take the values 0 or 2 here
1588 * since all frames are required to be aligned
1589 * to 2-byte boundaries when being passed to
1590 * mac80211. That also explains the __skb_push()
1593 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1595 if (WARN_ON(skb_headroom(skb) < 3)) {
1599 u8 *data = skb->data;
1600 size_t len = skb_headlen(skb);
1602 memmove(skb->data, data, len);
1603 skb_set_tail_pointer(skb, len);
1609 /* deliver to local stack */
1610 skb->protocol = eth_type_trans(skb, dev);
1611 memset(skb->cb, 0, sizeof(skb->cb));
1612 netif_receive_skb(skb);
1617 /* send to wireless media */
1618 xmit_skb->protocol = htons(ETH_P_802_3);
1619 skb_reset_network_header(xmit_skb);
1620 skb_reset_mac_header(xmit_skb);
1621 dev_queue_xmit(xmit_skb);
1625 static ieee80211_rx_result debug_noinline
1626 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1628 struct net_device *dev = rx->sdata->dev;
1629 struct sk_buff *skb = rx->skb;
1630 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1631 __le16 fc = hdr->frame_control;
1632 struct sk_buff_head frame_list;
1634 if (unlikely(!ieee80211_is_data(fc)))
1637 if (unlikely(!ieee80211_is_data_present(fc)))
1638 return RX_DROP_MONITOR;
1640 if (!(rx->flags & IEEE80211_RX_AMSDU))
1643 if (ieee80211_has_a4(hdr->frame_control) &&
1644 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1645 !rx->sdata->u.vlan.sta)
1646 return RX_DROP_UNUSABLE;
1648 if (is_multicast_ether_addr(hdr->addr1) &&
1649 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1650 rx->sdata->u.vlan.sta) ||
1651 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1652 rx->sdata->u.mgd.use_4addr)))
1653 return RX_DROP_UNUSABLE;
1656 __skb_queue_head_init(&frame_list);
1658 if (skb_linearize(skb))
1659 return RX_DROP_UNUSABLE;
1661 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1662 rx->sdata->vif.type,
1663 rx->local->hw.extra_tx_headroom);
1665 while (!skb_queue_empty(&frame_list)) {
1666 rx->skb = __skb_dequeue(&frame_list);
1668 if (!ieee80211_frame_allowed(rx, fc)) {
1669 dev_kfree_skb(rx->skb);
1672 dev->stats.rx_packets++;
1673 dev->stats.rx_bytes += rx->skb->len;
1675 ieee80211_deliver_skb(rx);
1681 #ifdef CONFIG_MAC80211_MESH
1682 static ieee80211_rx_result
1683 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1685 struct ieee80211_hdr *hdr;
1686 struct ieee80211s_hdr *mesh_hdr;
1687 unsigned int hdrlen;
1688 struct sk_buff *skb = rx->skb, *fwd_skb;
1689 struct ieee80211_local *local = rx->local;
1690 struct ieee80211_sub_if_data *sdata = rx->sdata;
1692 hdr = (struct ieee80211_hdr *) skb->data;
1693 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1694 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1696 if (!ieee80211_is_data(hdr->frame_control))
1701 return RX_DROP_MONITOR;
1703 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1704 struct mesh_path *mppath;
1708 if (is_multicast_ether_addr(hdr->addr1)) {
1709 mpp_addr = hdr->addr3;
1710 proxied_addr = mesh_hdr->eaddr1;
1712 mpp_addr = hdr->addr4;
1713 proxied_addr = mesh_hdr->eaddr2;
1717 mppath = mpp_path_lookup(proxied_addr, sdata);
1719 mpp_path_add(proxied_addr, mpp_addr, sdata);
1721 spin_lock_bh(&mppath->state_lock);
1722 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1723 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1724 spin_unlock_bh(&mppath->state_lock);
1729 /* Frame has reached destination. Don't forward */
1730 if (!is_multicast_ether_addr(hdr->addr1) &&
1731 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1736 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1738 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1739 dropped_frames_ttl);
1741 struct ieee80211_hdr *fwd_hdr;
1742 struct ieee80211_tx_info *info;
1744 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1746 if (!fwd_skb && net_ratelimit())
1747 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1750 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1751 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1752 info = IEEE80211_SKB_CB(fwd_skb);
1753 memset(info, 0, sizeof(*info));
1754 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1755 info->control.vif = &rx->sdata->vif;
1756 skb_set_queue_mapping(skb,
1757 ieee80211_select_queue(rx->sdata, fwd_skb));
1758 ieee80211_set_qos_hdr(local, skb);
1759 if (is_multicast_ether_addr(fwd_hdr->addr1))
1760 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1765 * Save TA to addr1 to send TA a path error if a
1766 * suitable next hop is not found
1768 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1770 err = mesh_nexthop_lookup(fwd_skb, sdata);
1771 /* Failed to immediately resolve next hop:
1772 * fwded frame was dropped or will be added
1773 * later to the pending skb queue. */
1775 return RX_DROP_MONITOR;
1777 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1780 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1782 ieee80211_add_pending_skb(local, fwd_skb);
1786 if (is_multicast_ether_addr(hdr->addr1) ||
1787 sdata->dev->flags & IFF_PROMISC)
1790 return RX_DROP_MONITOR;
1794 static ieee80211_rx_result debug_noinline
1795 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1797 struct ieee80211_sub_if_data *sdata = rx->sdata;
1798 struct ieee80211_local *local = rx->local;
1799 struct net_device *dev = sdata->dev;
1800 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1801 __le16 fc = hdr->frame_control;
1804 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1807 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1808 return RX_DROP_MONITOR;
1811 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1812 * that a 4-addr station can be detected and moved into a separate VLAN
1814 if (ieee80211_has_a4(hdr->frame_control) &&
1815 sdata->vif.type == NL80211_IFTYPE_AP)
1816 return RX_DROP_MONITOR;
1818 err = __ieee80211_data_to_8023(rx);
1820 return RX_DROP_UNUSABLE;
1822 if (!ieee80211_frame_allowed(rx, fc))
1823 return RX_DROP_MONITOR;
1827 dev->stats.rx_packets++;
1828 dev->stats.rx_bytes += rx->skb->len;
1830 if (ieee80211_is_data(hdr->frame_control) &&
1831 !is_multicast_ether_addr(hdr->addr1) &&
1832 local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1833 mod_timer(&local->dynamic_ps_timer, jiffies +
1834 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1837 ieee80211_deliver_skb(rx);
1842 static ieee80211_rx_result debug_noinline
1843 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
1845 struct ieee80211_local *local = rx->local;
1846 struct ieee80211_hw *hw = &local->hw;
1847 struct sk_buff *skb = rx->skb;
1848 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1849 struct tid_ampdu_rx *tid_agg_rx;
1853 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1856 if (ieee80211_is_back_req(bar->frame_control)) {
1858 __le16 control, start_seq_num;
1859 } __packed bar_data;
1862 return RX_DROP_MONITOR;
1864 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1865 &bar_data, sizeof(bar_data)))
1866 return RX_DROP_MONITOR;
1868 tid = le16_to_cpu(bar_data.control) >> 12;
1870 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1872 return RX_DROP_MONITOR;
1874 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
1876 /* reset session timer */
1877 if (tid_agg_rx->timeout)
1878 mod_timer(&tid_agg_rx->session_timer,
1879 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1881 /* release stored frames up to start of BAR */
1882 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1889 * After this point, we only want management frames,
1890 * so we can drop all remaining control frames to
1891 * cooked monitor interfaces.
1893 return RX_DROP_MONITOR;
1896 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1897 struct ieee80211_mgmt *mgmt,
1900 struct ieee80211_local *local = sdata->local;
1901 struct sk_buff *skb;
1902 struct ieee80211_mgmt *resp;
1904 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
1905 /* Not to own unicast address */
1909 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1910 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1911 /* Not from the current AP or not associated yet. */
1915 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1916 /* Too short SA Query request frame */
1920 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1924 skb_reserve(skb, local->hw.extra_tx_headroom);
1925 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1926 memset(resp, 0, 24);
1927 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1928 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
1929 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1930 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1931 IEEE80211_STYPE_ACTION);
1932 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1933 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1934 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1935 memcpy(resp->u.action.u.sa_query.trans_id,
1936 mgmt->u.action.u.sa_query.trans_id,
1937 WLAN_SA_QUERY_TR_ID_LEN);
1939 ieee80211_tx_skb(sdata, skb);
1942 static ieee80211_rx_result debug_noinline
1943 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
1945 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1948 * From here on, look only at management frames.
1949 * Data and control frames are already handled,
1950 * and unknown (reserved) frames are useless.
1952 if (rx->skb->len < 24)
1953 return RX_DROP_MONITOR;
1955 if (!ieee80211_is_mgmt(mgmt->frame_control))
1956 return RX_DROP_MONITOR;
1958 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1959 return RX_DROP_MONITOR;
1961 if (ieee80211_drop_unencrypted_mgmt(rx))
1962 return RX_DROP_UNUSABLE;
1967 static ieee80211_rx_result debug_noinline
1968 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1970 struct ieee80211_local *local = rx->local;
1971 struct ieee80211_sub_if_data *sdata = rx->sdata;
1972 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1973 int len = rx->skb->len;
1975 if (!ieee80211_is_action(mgmt->frame_control))
1978 /* drop too small frames */
1979 if (len < IEEE80211_MIN_ACTION_SIZE)
1980 return RX_DROP_UNUSABLE;
1982 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
1983 return RX_DROP_UNUSABLE;
1985 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1986 return RX_DROP_UNUSABLE;
1988 switch (mgmt->u.action.category) {
1989 case WLAN_CATEGORY_BACK:
1991 * The aggregation code is not prepared to handle
1992 * anything but STA/AP due to the BSSID handling;
1993 * IBSS could work in the code but isn't supported
1994 * by drivers or the standard.
1996 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1997 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1998 sdata->vif.type != NL80211_IFTYPE_AP)
2001 /* verify action_code is present */
2002 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2005 switch (mgmt->u.action.u.addba_req.action_code) {
2006 case WLAN_ACTION_ADDBA_REQ:
2007 if (len < (IEEE80211_MIN_ACTION_SIZE +
2008 sizeof(mgmt->u.action.u.addba_req)))
2011 case WLAN_ACTION_ADDBA_RESP:
2012 if (len < (IEEE80211_MIN_ACTION_SIZE +
2013 sizeof(mgmt->u.action.u.addba_resp)))
2016 case WLAN_ACTION_DELBA:
2017 if (len < (IEEE80211_MIN_ACTION_SIZE +
2018 sizeof(mgmt->u.action.u.delba)))
2026 case WLAN_CATEGORY_SPECTRUM_MGMT:
2027 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2030 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2033 /* verify action_code is present */
2034 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2037 switch (mgmt->u.action.u.measurement.action_code) {
2038 case WLAN_ACTION_SPCT_MSR_REQ:
2039 if (len < (IEEE80211_MIN_ACTION_SIZE +
2040 sizeof(mgmt->u.action.u.measurement)))
2042 ieee80211_process_measurement_req(sdata, mgmt, len);
2044 case WLAN_ACTION_SPCT_CHL_SWITCH:
2045 if (len < (IEEE80211_MIN_ACTION_SIZE +
2046 sizeof(mgmt->u.action.u.chan_switch)))
2049 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2052 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2058 case WLAN_CATEGORY_SA_QUERY:
2059 if (len < (IEEE80211_MIN_ACTION_SIZE +
2060 sizeof(mgmt->u.action.u.sa_query)))
2063 switch (mgmt->u.action.u.sa_query.action) {
2064 case WLAN_ACTION_SA_QUERY_REQUEST:
2065 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2067 ieee80211_process_sa_query_req(sdata, mgmt, len);
2071 case WLAN_CATEGORY_MESH_PLINK:
2072 case WLAN_CATEGORY_MESH_PATH_SEL:
2073 if (!ieee80211_vif_is_mesh(&sdata->vif))
2081 rx->flags |= IEEE80211_MALFORMED_ACTION_FRM;
2082 /* will return in the next handlers */
2087 rx->sta->rx_packets++;
2088 dev_kfree_skb(rx->skb);
2092 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2093 skb_queue_tail(&sdata->skb_queue, rx->skb);
2094 ieee80211_queue_work(&local->hw, &sdata->work);
2096 rx->sta->rx_packets++;
2100 static ieee80211_rx_result debug_noinline
2101 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2103 struct ieee80211_rx_status *status;
2105 /* skip known-bad action frames and return them in the next handler */
2106 if (rx->flags & IEEE80211_MALFORMED_ACTION_FRM)
2110 * Getting here means the kernel doesn't know how to handle
2111 * it, but maybe userspace does ... include returned frames
2112 * so userspace can register for those to know whether ones
2113 * it transmitted were processed or returned.
2115 status = IEEE80211_SKB_RXCB(rx->skb);
2117 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2118 rx->skb->data, rx->skb->len,
2121 rx->sta->rx_packets++;
2122 dev_kfree_skb(rx->skb);
2130 static ieee80211_rx_result debug_noinline
2131 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2133 struct ieee80211_local *local = rx->local;
2134 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2135 struct sk_buff *nskb;
2136 struct ieee80211_sub_if_data *sdata = rx->sdata;
2138 if (!ieee80211_is_action(mgmt->frame_control))
2142 * For AP mode, hostapd is responsible for handling any action
2143 * frames that we didn't handle, including returning unknown
2144 * ones. For all other modes we will return them to the sender,
2145 * setting the 0x80 bit in the action category, as required by
2146 * 802.11-2007 7.3.1.11.
2147 * Newer versions of hostapd shall also use the management frame
2148 * registration mechanisms, but older ones still use cooked
2149 * monitor interfaces so push all frames there.
2151 if (!(rx->flags & IEEE80211_MALFORMED_ACTION_FRM) &&
2152 (sdata->vif.type == NL80211_IFTYPE_AP ||
2153 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2154 return RX_DROP_MONITOR;
2156 /* do not return rejected action frames */
2157 if (mgmt->u.action.category & 0x80)
2158 return RX_DROP_UNUSABLE;
2160 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2163 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2165 nmgmt->u.action.category |= 0x80;
2166 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2167 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2169 memset(nskb->cb, 0, sizeof(nskb->cb));
2171 ieee80211_tx_skb(rx->sdata, nskb);
2173 dev_kfree_skb(rx->skb);
2177 static ieee80211_rx_result debug_noinline
2178 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2180 struct ieee80211_sub_if_data *sdata = rx->sdata;
2181 ieee80211_rx_result rxs;
2182 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2185 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2186 if (rxs != RX_CONTINUE)
2189 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2191 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2192 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2193 sdata->vif.type != NL80211_IFTYPE_STATION)
2194 return RX_DROP_MONITOR;
2197 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2198 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2199 /* process for all: mesh, mlme, ibss */
2201 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2202 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2203 /* process only for station */
2204 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2205 return RX_DROP_MONITOR;
2207 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2208 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2209 /* process only for ibss */
2210 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2211 return RX_DROP_MONITOR;
2214 return RX_DROP_MONITOR;
2217 /* queue up frame and kick off work to process it */
2218 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2219 skb_queue_tail(&sdata->skb_queue, rx->skb);
2220 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2222 rx->sta->rx_packets++;
2227 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
2228 struct ieee80211_rx_data *rx)
2231 unsigned int hdrlen;
2233 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2234 if (rx->skb->len >= hdrlen + 4)
2235 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2241 * Some hardware seem to generate incorrect Michael MIC
2242 * reports; ignore them to avoid triggering countermeasures.
2247 if (!ieee80211_has_protected(hdr->frame_control))
2250 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
2252 * APs with pairwise keys should never receive Michael MIC
2253 * errors for non-zero keyidx because these are reserved for
2254 * group keys and only the AP is sending real multicast
2255 * frames in the BSS.
2260 if (!ieee80211_is_data(hdr->frame_control) &&
2261 !ieee80211_is_auth(hdr->frame_control))
2264 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2268 /* TODO: use IEEE80211_RX_FRAGMENTED */
2269 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2270 struct ieee80211_rate *rate)
2272 struct ieee80211_sub_if_data *sdata;
2273 struct ieee80211_local *local = rx->local;
2274 struct ieee80211_rtap_hdr {
2275 struct ieee80211_radiotap_header hdr;
2281 struct sk_buff *skb = rx->skb, *skb2;
2282 struct net_device *prev_dev = NULL;
2283 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2285 if (status->flag & RX_FLAG_INTERNAL_CMTR)
2288 if (skb_headroom(skb) < sizeof(*rthdr) &&
2289 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2292 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2293 memset(rthdr, 0, sizeof(*rthdr));
2294 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2295 rthdr->hdr.it_present =
2296 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2297 (1 << IEEE80211_RADIOTAP_CHANNEL));
2300 rthdr->rate_or_pad = rate->bitrate / 5;
2301 rthdr->hdr.it_present |=
2302 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2304 rthdr->chan_freq = cpu_to_le16(status->freq);
2306 if (status->band == IEEE80211_BAND_5GHZ)
2307 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2308 IEEE80211_CHAN_5GHZ);
2310 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2311 IEEE80211_CHAN_2GHZ);
2313 skb_set_mac_header(skb, 0);
2314 skb->ip_summed = CHECKSUM_UNNECESSARY;
2315 skb->pkt_type = PACKET_OTHERHOST;
2316 skb->protocol = htons(ETH_P_802_2);
2318 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2319 if (!ieee80211_sdata_running(sdata))
2322 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2323 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2327 skb2 = skb_clone(skb, GFP_ATOMIC);
2329 skb2->dev = prev_dev;
2330 netif_receive_skb(skb2);
2334 prev_dev = sdata->dev;
2335 sdata->dev->stats.rx_packets++;
2336 sdata->dev->stats.rx_bytes += skb->len;
2340 skb->dev = prev_dev;
2341 netif_receive_skb(skb);
2346 status->flag |= RX_FLAG_INTERNAL_CMTR;
2353 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2354 ieee80211_rx_result res)
2357 case RX_DROP_MONITOR:
2358 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2360 rx->sta->rx_dropped++;
2363 struct ieee80211_rate *rate = NULL;
2364 struct ieee80211_supported_band *sband;
2365 struct ieee80211_rx_status *status;
2367 status = IEEE80211_SKB_RXCB((rx->skb));
2369 sband = rx->local->hw.wiphy->bands[status->band];
2370 if (!(status->flag & RX_FLAG_HT))
2371 rate = &sband->bitrates[status->rate_idx];
2373 ieee80211_rx_cooked_monitor(rx, rate);
2376 case RX_DROP_UNUSABLE:
2377 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2379 rx->sta->rx_dropped++;
2380 dev_kfree_skb(rx->skb);
2383 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2388 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2389 struct sk_buff_head *frames)
2391 ieee80211_rx_result res = RX_DROP_MONITOR;
2392 struct sk_buff *skb;
2394 #define CALL_RXH(rxh) \
2397 if (res != RX_CONTINUE) \
2401 while ((skb = __skb_dequeue(frames))) {
2403 * all the other fields are valid across frames
2404 * that belong to an aMPDU since they are on the
2405 * same TID from the same station
2409 CALL_RXH(ieee80211_rx_h_decrypt)
2410 CALL_RXH(ieee80211_rx_h_check_more_data)
2411 CALL_RXH(ieee80211_rx_h_sta_process)
2412 CALL_RXH(ieee80211_rx_h_defragment)
2413 CALL_RXH(ieee80211_rx_h_ps_poll)
2414 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2415 /* must be after MMIC verify so header is counted in MPDU mic */
2416 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2417 CALL_RXH(ieee80211_rx_h_amsdu)
2418 #ifdef CONFIG_MAC80211_MESH
2419 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2420 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2422 CALL_RXH(ieee80211_rx_h_data)
2424 /* special treatment -- needs the queue */
2425 res = ieee80211_rx_h_ctrl(rx, frames);
2426 if (res != RX_CONTINUE)
2429 CALL_RXH(ieee80211_rx_h_mgmt_check)
2430 CALL_RXH(ieee80211_rx_h_action)
2431 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2432 CALL_RXH(ieee80211_rx_h_action_return)
2433 CALL_RXH(ieee80211_rx_h_mgmt)
2436 ieee80211_rx_handlers_result(rx, res);
2442 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
2443 struct ieee80211_rx_data *rx,
2444 struct sk_buff *skb)
2446 struct sk_buff_head reorder_release;
2447 ieee80211_rx_result res = RX_DROP_MONITOR;
2449 __skb_queue_head_init(&reorder_release);
2454 #define CALL_RXH(rxh) \
2457 if (res != RX_CONTINUE) \
2461 CALL_RXH(ieee80211_rx_h_passive_scan)
2462 CALL_RXH(ieee80211_rx_h_check)
2464 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2466 ieee80211_rx_handlers(rx, &reorder_release);
2470 ieee80211_rx_handlers_result(rx, res);
2476 * This function makes calls into the RX path. Therefore the
2477 * caller must hold the sta_info->lock and everything has to
2478 * be under rcu_read_lock protection as well.
2480 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2482 struct sk_buff_head frames;
2483 struct ieee80211_rx_data rx = { };
2485 __skb_queue_head_init(&frames);
2487 /* construct rx struct */
2489 rx.sdata = sta->sdata;
2490 rx.local = sta->local;
2492 rx.flags |= IEEE80211_RX_RA_MATCH;
2494 if (unlikely(test_bit(SCAN_HW_SCANNING, &sta->local->scanning) ||
2495 test_bit(SCAN_OFF_CHANNEL, &sta->local->scanning)))
2496 rx.flags |= IEEE80211_RX_IN_SCAN;
2498 spin_lock(&sta->ampdu_mlme.tid_rx[tid]->reorder_lock);
2499 ieee80211_sta_reorder_release(&sta->local->hw,
2500 sta->ampdu_mlme.tid_rx[tid], &frames);
2501 spin_unlock(&sta->ampdu_mlme.tid_rx[tid]->reorder_lock);
2503 ieee80211_rx_handlers(&rx, &frames);
2506 /* main receive path */
2508 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2509 struct ieee80211_rx_data *rx,
2510 struct ieee80211_hdr *hdr)
2512 struct sk_buff *skb = rx->skb;
2513 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2514 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2515 int multicast = is_multicast_ether_addr(hdr->addr1);
2517 switch (sdata->vif.type) {
2518 case NL80211_IFTYPE_STATION:
2519 if (!bssid && !sdata->u.mgd.use_4addr)
2522 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2523 if (!(sdata->dev->flags & IFF_PROMISC))
2525 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2528 case NL80211_IFTYPE_ADHOC:
2531 if (ieee80211_is_beacon(hdr->frame_control)) {
2534 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2535 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2537 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2538 } else if (!multicast &&
2539 compare_ether_addr(sdata->vif.addr,
2541 if (!(sdata->dev->flags & IFF_PROMISC))
2543 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2544 } else if (!rx->sta) {
2546 if (status->flag & RX_FLAG_HT)
2547 rate_idx = 0; /* TODO: HT rates */
2549 rate_idx = status->rate_idx;
2550 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2551 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2554 case NL80211_IFTYPE_MESH_POINT:
2556 compare_ether_addr(sdata->vif.addr,
2558 if (!(sdata->dev->flags & IFF_PROMISC))
2561 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2564 case NL80211_IFTYPE_AP_VLAN:
2565 case NL80211_IFTYPE_AP:
2567 if (compare_ether_addr(sdata->vif.addr,
2570 } else if (!ieee80211_bssid_match(bssid,
2572 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2574 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2577 case NL80211_IFTYPE_WDS:
2578 if (bssid || !ieee80211_is_data(hdr->frame_control))
2580 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2583 case NL80211_IFTYPE_MONITOR:
2584 case NL80211_IFTYPE_UNSPECIFIED:
2585 case NUM_NL80211_IFTYPES:
2586 /* should never get here */
2595 * This is the actual Rx frames handler. as it blongs to Rx path it must
2596 * be called with rcu_read_lock protection.
2598 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2599 struct sk_buff *skb)
2601 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2602 struct ieee80211_local *local = hw_to_local(hw);
2603 struct ieee80211_sub_if_data *sdata;
2604 struct ieee80211_hdr *hdr;
2606 struct ieee80211_rx_data rx;
2608 struct ieee80211_sub_if_data *prev = NULL;
2609 struct sk_buff *skb_new;
2610 struct sta_info *sta, *tmp;
2611 bool found_sta = false;
2614 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2615 memset(&rx, 0, sizeof(rx));
2619 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2620 local->dot11ReceivedFragmentCount++;
2622 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2623 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2624 rx.flags |= IEEE80211_RX_IN_SCAN;
2626 if (ieee80211_is_mgmt(fc))
2627 err = skb_linearize(skb);
2629 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2636 hdr = (struct ieee80211_hdr *)skb->data;
2637 ieee80211_parse_qos(&rx);
2638 ieee80211_verify_alignment(&rx);
2640 if (ieee80211_is_data(fc)) {
2641 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2644 rx.sdata = sta->sdata;
2646 rx.flags |= IEEE80211_RX_RA_MATCH;
2647 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2649 if (status->flag & RX_FLAG_MMIC_ERROR) {
2650 if (rx.flags & IEEE80211_RX_RA_MATCH)
2651 ieee80211_rx_michael_mic_report(hdr, &rx);
2658 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2659 if (!ieee80211_sdata_running(sdata))
2662 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2663 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2667 * frame is destined for this interface, but if it's
2668 * not also for the previous one we handle that after
2669 * the loop to avoid copying the SKB once too much
2677 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2679 rx.flags |= IEEE80211_RX_RA_MATCH;
2680 prepares = prepare_for_handlers(prev, &rx, hdr);
2685 if (status->flag & RX_FLAG_MMIC_ERROR) {
2687 if (rx.flags & IEEE80211_RX_RA_MATCH)
2688 ieee80211_rx_michael_mic_report(hdr,
2694 * frame was destined for the previous interface
2695 * so invoke RX handlers for it
2698 skb_new = skb_copy(skb, GFP_ATOMIC);
2700 if (net_ratelimit())
2701 printk(KERN_DEBUG "%s: failed to copy "
2702 "multicast frame for %s\n",
2703 wiphy_name(local->hw.wiphy),
2707 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2713 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2715 rx.flags |= IEEE80211_RX_RA_MATCH;
2716 prepares = prepare_for_handlers(prev, &rx, hdr);
2723 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2729 * This is the receive path handler. It is called by a low level driver when an
2730 * 802.11 MPDU is received from the hardware.
2732 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2734 struct ieee80211_local *local = hw_to_local(hw);
2735 struct ieee80211_rate *rate = NULL;
2736 struct ieee80211_supported_band *sband;
2737 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2739 WARN_ON_ONCE(softirq_count() == 0);
2741 if (WARN_ON(status->band < 0 ||
2742 status->band >= IEEE80211_NUM_BANDS))
2745 sband = local->hw.wiphy->bands[status->band];
2746 if (WARN_ON(!sband))
2750 * If we're suspending, it is possible although not too likely
2751 * that we'd be receiving frames after having already partially
2752 * quiesced the stack. We can't process such frames then since
2753 * that might, for example, cause stations to be added or other
2754 * driver callbacks be invoked.
2756 if (unlikely(local->quiescing || local->suspended))
2760 * The same happens when we're not even started,
2761 * but that's worth a warning.
2763 if (WARN_ON(!local->started))
2766 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
2768 * Validate the rate, unless a PLCP error means that
2769 * we probably can't have a valid rate here anyway.
2772 if (status->flag & RX_FLAG_HT) {
2774 * rate_idx is MCS index, which can be [0-76]
2777 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2779 * Anything else would be some sort of driver or
2780 * hardware error. The driver should catch hardware
2783 if (WARN((status->rate_idx < 0 ||
2784 status->rate_idx > 76),
2785 "Rate marked as an HT rate but passed "
2786 "status->rate_idx is not "
2787 "an MCS index [0-76]: %d (0x%02x)\n",
2792 if (WARN_ON(status->rate_idx < 0 ||
2793 status->rate_idx >= sband->n_bitrates))
2795 rate = &sband->bitrates[status->rate_idx];
2800 * key references and virtual interfaces are protected using RCU
2801 * and this requires that we are in a read-side RCU section during
2802 * receive processing
2807 * Frames with failed FCS/PLCP checksum are not returned,
2808 * all other frames are returned without radiotap header
2809 * if it was previously present.
2810 * Also, frames with less than 16 bytes are dropped.
2812 skb = ieee80211_rx_monitor(local, skb, rate);
2818 __ieee80211_rx_handle_packet(hw, skb);
2826 EXPORT_SYMBOL(ieee80211_rx);
2828 /* This is a version of the rx handler that can be called from hard irq
2829 * context. Post the skb on the queue and schedule the tasklet */
2830 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2832 struct ieee80211_local *local = hw_to_local(hw);
2834 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2836 skb->pkt_type = IEEE80211_RX_MSG;
2837 skb_queue_tail(&local->skb_queue, skb);
2838 tasklet_schedule(&local->tasklet);
2840 EXPORT_SYMBOL(ieee80211_rx_irqsafe);