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;
300 prev_dev = sdata->dev;
301 sdata->dev->stats.rx_packets++;
302 sdata->dev->stats.rx_bytes += skb->len;
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 ieee80211_supported_band *sband;
542 struct ieee80211_rate *rate = NULL;
543 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
544 struct ieee80211_rx_status *status;
549 status = IEEE80211_SKB_RXCB(skb);
551 /* release the reordered frames to stack */
552 sband = hw->wiphy->bands[status->band];
553 if (!(status->flag & RX_FLAG_HT))
554 rate = &sband->bitrates[status->rate_idx];
555 tid_agg_rx->stored_mpdu_num--;
556 tid_agg_rx->reorder_buf[index] = NULL;
557 __skb_queue_tail(frames, skb);
560 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
563 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
564 struct tid_ampdu_rx *tid_agg_rx,
566 struct sk_buff_head *frames)
570 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
571 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
572 tid_agg_rx->buf_size;
573 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
578 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
579 * the skb was added to the buffer longer than this time ago, the earlier
580 * frames that have not yet been received are assumed to be lost and the skb
581 * can be released for processing. This may also release other skb's from the
582 * reorder buffer if there are no additional gaps between the frames.
584 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
587 * As this function belongs to the RX path it must be under
588 * rcu_read_lock protection. It returns false if the frame
589 * can be processed immediately, true if it was consumed.
591 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
592 struct tid_ampdu_rx *tid_agg_rx,
594 struct sk_buff_head *frames)
596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
597 u16 sc = le16_to_cpu(hdr->seq_ctrl);
598 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
599 u16 head_seq_num, buf_size;
602 buf_size = tid_agg_rx->buf_size;
603 head_seq_num = tid_agg_rx->head_seq_num;
605 /* frame with out of date sequence number */
606 if (seq_less(mpdu_seq_num, head_seq_num)) {
612 * If frame the sequence number exceeds our buffering window
613 * size release some previous frames to make room for this one.
615 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
616 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
617 /* release stored frames up to new head to stack */
618 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
622 /* Now the new frame is always in the range of the reordering buffer */
624 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
626 /* check if we already stored this frame */
627 if (tid_agg_rx->reorder_buf[index]) {
633 * If the current MPDU is in the right order and nothing else
634 * is stored we can process it directly, no need to buffer it.
636 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
637 tid_agg_rx->stored_mpdu_num == 0) {
638 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
642 /* put the frame in the reordering buffer */
643 tid_agg_rx->reorder_buf[index] = skb;
644 tid_agg_rx->reorder_time[index] = jiffies;
645 tid_agg_rx->stored_mpdu_num++;
646 /* release the buffer until next missing frame */
647 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
648 tid_agg_rx->buf_size;
649 if (!tid_agg_rx->reorder_buf[index] &&
650 tid_agg_rx->stored_mpdu_num > 1) {
652 * No buffers ready to be released, but check whether any
653 * frames in the reorder buffer have timed out.
657 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
658 j = (j + 1) % tid_agg_rx->buf_size) {
659 if (!tid_agg_rx->reorder_buf[j]) {
663 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
664 HT_RX_REORDER_BUF_TIMEOUT))
667 #ifdef CONFIG_MAC80211_HT_DEBUG
669 printk(KERN_DEBUG "%s: release an RX reorder "
670 "frame due to timeout on earlier "
672 wiphy_name(hw->wiphy));
674 ieee80211_release_reorder_frame(hw, tid_agg_rx,
678 * Increment the head seq# also for the skipped slots.
680 tid_agg_rx->head_seq_num =
681 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
684 } else while (tid_agg_rx->reorder_buf[index]) {
685 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
686 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
687 tid_agg_rx->buf_size;
694 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
695 * true if the MPDU was buffered, false if it should be processed.
697 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
698 struct sk_buff_head *frames)
700 struct sk_buff *skb = rx->skb;
701 struct ieee80211_local *local = rx->local;
702 struct ieee80211_hw *hw = &local->hw;
703 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
704 struct sta_info *sta = rx->sta;
705 struct tid_ampdu_rx *tid_agg_rx;
709 if (!ieee80211_is_data_qos(hdr->frame_control))
713 * filter the QoS data rx stream according to
714 * STA/TID and check if this STA/TID is on aggregation
720 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
722 spin_lock(&sta->lock);
724 if (!sta->ampdu_mlme.tid_active_rx[tid])
725 goto dont_reorder_unlock;
727 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
729 /* qos null data frames are excluded */
730 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
731 goto dont_reorder_unlock;
733 /* new, potentially un-ordered, ampdu frame - process it */
735 /* reset session timer */
736 if (tid_agg_rx->timeout)
737 mod_timer(&tid_agg_rx->session_timer,
738 TU_TO_EXP_TIME(tid_agg_rx->timeout));
740 /* if this mpdu is fragmented - terminate rx aggregation session */
741 sc = le16_to_cpu(hdr->seq_ctrl);
742 if (sc & IEEE80211_SCTL_FRAG) {
743 spin_unlock(&sta->lock);
744 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
745 WLAN_REASON_QSTA_REQUIRE_SETUP);
750 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames)) {
751 spin_unlock(&sta->lock);
756 spin_unlock(&sta->lock);
758 __skb_queue_tail(frames, skb);
761 static ieee80211_rx_result debug_noinline
762 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
764 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
766 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
767 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
768 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
769 rx->sta->last_seq_ctrl[rx->queue] ==
771 if (rx->flags & IEEE80211_RX_RA_MATCH) {
772 rx->local->dot11FrameDuplicateCount++;
773 rx->sta->num_duplicates++;
775 return RX_DROP_MONITOR;
777 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
780 if (unlikely(rx->skb->len < 16)) {
781 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
782 return RX_DROP_MONITOR;
785 /* Drop disallowed frame classes based on STA auth/assoc state;
786 * IEEE 802.11, Chap 5.5.
788 * mac80211 filters only based on association state, i.e. it drops
789 * Class 3 frames from not associated stations. hostapd sends
790 * deauth/disassoc frames when needed. In addition, hostapd is
791 * responsible for filtering on both auth and assoc states.
794 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
795 return ieee80211_rx_mesh_check(rx);
797 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
798 ieee80211_is_pspoll(hdr->frame_control)) &&
799 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
800 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
801 if ((!ieee80211_has_fromds(hdr->frame_control) &&
802 !ieee80211_has_tods(hdr->frame_control) &&
803 ieee80211_is_data(hdr->frame_control)) ||
804 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
805 /* Drop IBSS frames and frames for other hosts
807 return RX_DROP_MONITOR;
810 return RX_DROP_MONITOR;
817 static ieee80211_rx_result debug_noinline
818 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
820 struct sk_buff *skb = rx->skb;
821 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
822 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
825 ieee80211_rx_result result = RX_DROP_UNUSABLE;
826 struct ieee80211_key *stakey = NULL;
827 int mmie_keyidx = -1;
832 * There are four types of keys:
834 * - IGTK (group keys for management frames)
835 * - PTK (pairwise keys)
836 * - STK (station-to-station pairwise keys)
838 * When selecting a key, we have to distinguish between multicast
839 * (including broadcast) and unicast frames, the latter can only
840 * use PTKs and STKs while the former always use GTKs and IGTKs.
841 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
842 * unicast frames can also use key indices like GTKs. Hence, if we
843 * don't have a PTK/STK we check the key index for a WEP key.
845 * Note that in a regular BSS, multicast frames are sent by the
846 * AP only, associated stations unicast the frame to the AP first
847 * which then multicasts it on their behalf.
849 * There is also a slight problem in IBSS mode: GTKs are negotiated
850 * with each station, that is something we don't currently handle.
851 * The spec seems to expect that one negotiates the same key with
852 * every station but there's no such requirement; VLANs could be
857 * No point in finding a key and decrypting if the frame is neither
858 * addressed to us nor a multicast frame.
860 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
863 /* start without a key */
867 stakey = rcu_dereference(rx->sta->key);
869 if (!ieee80211_has_protected(hdr->frame_control))
870 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
872 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
874 /* Skip decryption if the frame is not protected. */
875 if (!ieee80211_has_protected(hdr->frame_control))
877 } else if (mmie_keyidx >= 0) {
878 /* Broadcast/multicast robust management frame / BIP */
879 if ((status->flag & RX_FLAG_DECRYPTED) &&
880 (status->flag & RX_FLAG_IV_STRIPPED))
883 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
884 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
885 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
886 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
887 } else if (!ieee80211_has_protected(hdr->frame_control)) {
889 * The frame was not protected, so skip decryption. However, we
890 * need to set rx->key if there is a key that could have been
891 * used so that the frame may be dropped if encryption would
892 * have been expected.
894 struct ieee80211_key *key = NULL;
895 if (ieee80211_is_mgmt(hdr->frame_control) &&
896 is_multicast_ether_addr(hdr->addr1) &&
897 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
899 else if ((key = rcu_dereference(rx->sdata->default_key)))
905 * The device doesn't give us the IV so we won't be
906 * able to look up the key. That's ok though, we
907 * don't need to decrypt the frame, we just won't
908 * be able to keep statistics accurate.
909 * Except for key threshold notifications, should
910 * we somehow allow the driver to tell us which key
911 * the hardware used if this flag is set?
913 if ((status->flag & RX_FLAG_DECRYPTED) &&
914 (status->flag & RX_FLAG_IV_STRIPPED))
917 hdrlen = ieee80211_hdrlen(hdr->frame_control);
919 if (rx->skb->len < 8 + hdrlen)
920 return RX_DROP_UNUSABLE; /* TODO: count this? */
923 * no need to call ieee80211_wep_get_keyidx,
924 * it verifies a bunch of things we've done already
926 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
929 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
932 * RSNA-protected unicast frames should always be sent with
933 * pairwise or station-to-station keys, but for WEP we allow
934 * using a key index as well.
936 if (rx->key && rx->key->conf.alg != ALG_WEP &&
937 !is_multicast_ether_addr(hdr->addr1))
942 rx->key->tx_rx_count++;
943 /* TODO: add threshold stuff again */
945 return RX_DROP_MONITOR;
948 if (skb_linearize(rx->skb))
949 return RX_DROP_UNUSABLE;
951 hdr = (struct ieee80211_hdr *)rx->skb->data;
953 /* Check for weak IVs if possible */
954 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
955 ieee80211_is_data(hdr->frame_control) &&
956 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
957 !(status->flag & RX_FLAG_DECRYPTED)) &&
958 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
959 rx->sta->wep_weak_iv_count++;
961 switch (rx->key->conf.alg) {
963 result = ieee80211_crypto_wep_decrypt(rx);
966 result = ieee80211_crypto_tkip_decrypt(rx);
969 result = ieee80211_crypto_ccmp_decrypt(rx);
972 result = ieee80211_crypto_aes_cmac_decrypt(rx);
976 /* either the frame has been decrypted or will be dropped */
977 status->flag |= RX_FLAG_DECRYPTED;
982 static ieee80211_rx_result debug_noinline
983 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
985 struct ieee80211_local *local;
986 struct ieee80211_hdr *hdr;
991 hdr = (struct ieee80211_hdr *) skb->data;
993 if (!local->pspolling)
996 if (!ieee80211_has_fromds(hdr->frame_control))
997 /* this is not from AP */
1000 if (!ieee80211_is_data(hdr->frame_control))
1003 if (!ieee80211_has_moredata(hdr->frame_control)) {
1004 /* AP has no more frames buffered for us */
1005 local->pspolling = false;
1009 /* more data bit is set, let's request a new frame from the AP */
1010 ieee80211_send_pspoll(local, rx->sdata);
1015 static void ap_sta_ps_start(struct sta_info *sta)
1017 struct ieee80211_sub_if_data *sdata = sta->sdata;
1018 struct ieee80211_local *local = sdata->local;
1020 atomic_inc(&sdata->bss->num_sta_ps);
1021 set_sta_flags(sta, WLAN_STA_PS_STA);
1022 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1023 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1024 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1025 sdata->name, sta->sta.addr, sta->sta.aid);
1026 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1029 static void ap_sta_ps_end(struct sta_info *sta)
1031 struct ieee80211_sub_if_data *sdata = sta->sdata;
1033 atomic_dec(&sdata->bss->num_sta_ps);
1035 clear_sta_flags(sta, WLAN_STA_PS_STA);
1037 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1038 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1039 sdata->name, sta->sta.addr, sta->sta.aid);
1040 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1042 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
1043 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1044 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1045 sdata->name, sta->sta.addr, sta->sta.aid);
1046 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1050 ieee80211_sta_ps_deliver_wakeup(sta);
1053 static ieee80211_rx_result debug_noinline
1054 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1056 struct sta_info *sta = rx->sta;
1057 struct sk_buff *skb = rx->skb;
1058 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1059 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1065 * Update last_rx only for IBSS packets which are for the current
1066 * BSSID to avoid keeping the current IBSS network alive in cases
1067 * where other STAs start using different BSSID.
1069 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1070 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1071 NL80211_IFTYPE_ADHOC);
1072 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
1073 sta->last_rx = jiffies;
1074 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1076 * Mesh beacons will update last_rx when if they are found to
1077 * match the current local configuration when processed.
1079 sta->last_rx = jiffies;
1082 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1085 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1086 ieee80211_sta_rx_notify(rx->sdata, hdr);
1088 sta->rx_fragments++;
1089 sta->rx_bytes += rx->skb->len;
1090 sta->last_signal = status->signal;
1093 * Change STA power saving mode only at the end of a frame
1094 * exchange sequence.
1096 if (!ieee80211_has_morefrags(hdr->frame_control) &&
1097 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1098 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1099 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
1101 * Ignore doze->wake transitions that are
1102 * indicated by non-data frames, the standard
1103 * is unclear here, but for example going to
1104 * PS mode and then scanning would cause a
1105 * doze->wake transition for the probe request,
1106 * and that is clearly undesirable.
1108 if (ieee80211_is_data(hdr->frame_control) &&
1109 !ieee80211_has_pm(hdr->frame_control))
1112 if (ieee80211_has_pm(hdr->frame_control))
1113 ap_sta_ps_start(sta);
1118 * Drop (qos-)data::nullfunc frames silently, since they
1119 * are used only to control station power saving mode.
1121 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1122 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1123 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1126 * If we receive a 4-addr nullfunc frame from a STA
1127 * that was not moved to a 4-addr STA vlan yet, drop
1128 * the frame to the monitor interface, to make sure
1129 * that hostapd sees it
1131 if (ieee80211_has_a4(hdr->frame_control) &&
1132 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1133 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1134 !rx->sdata->u.vlan.sta)))
1135 return RX_DROP_MONITOR;
1137 * Update counter and free packet here to avoid
1138 * counting this as a dropped packed.
1141 dev_kfree_skb(rx->skb);
1146 } /* ieee80211_rx_h_sta_process */
1148 static inline struct ieee80211_fragment_entry *
1149 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1150 unsigned int frag, unsigned int seq, int rx_queue,
1151 struct sk_buff **skb)
1153 struct ieee80211_fragment_entry *entry;
1156 idx = sdata->fragment_next;
1157 entry = &sdata->fragments[sdata->fragment_next++];
1158 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1159 sdata->fragment_next = 0;
1161 if (!skb_queue_empty(&entry->skb_list)) {
1162 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1163 struct ieee80211_hdr *hdr =
1164 (struct ieee80211_hdr *) entry->skb_list.next->data;
1165 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1166 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1167 "addr1=%pM addr2=%pM\n",
1169 jiffies - entry->first_frag_time, entry->seq,
1170 entry->last_frag, hdr->addr1, hdr->addr2);
1172 __skb_queue_purge(&entry->skb_list);
1175 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1177 entry->first_frag_time = jiffies;
1179 entry->rx_queue = rx_queue;
1180 entry->last_frag = frag;
1182 entry->extra_len = 0;
1187 static inline struct ieee80211_fragment_entry *
1188 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1189 unsigned int frag, unsigned int seq,
1190 int rx_queue, struct ieee80211_hdr *hdr)
1192 struct ieee80211_fragment_entry *entry;
1195 idx = sdata->fragment_next;
1196 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1197 struct ieee80211_hdr *f_hdr;
1201 idx = IEEE80211_FRAGMENT_MAX - 1;
1203 entry = &sdata->fragments[idx];
1204 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1205 entry->rx_queue != rx_queue ||
1206 entry->last_frag + 1 != frag)
1209 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1212 * Check ftype and addresses are equal, else check next fragment
1214 if (((hdr->frame_control ^ f_hdr->frame_control) &
1215 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1216 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1217 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1220 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1221 __skb_queue_purge(&entry->skb_list);
1230 static ieee80211_rx_result debug_noinline
1231 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1233 struct ieee80211_hdr *hdr;
1236 unsigned int frag, seq;
1237 struct ieee80211_fragment_entry *entry;
1238 struct sk_buff *skb;
1240 hdr = (struct ieee80211_hdr *)rx->skb->data;
1241 fc = hdr->frame_control;
1242 sc = le16_to_cpu(hdr->seq_ctrl);
1243 frag = sc & IEEE80211_SCTL_FRAG;
1245 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1246 (rx->skb)->len < 24 ||
1247 is_multicast_ether_addr(hdr->addr1))) {
1248 /* not fragmented */
1251 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1253 if (skb_linearize(rx->skb))
1254 return RX_DROP_UNUSABLE;
1256 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1259 /* This is the first fragment of a new frame. */
1260 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1261 rx->queue, &(rx->skb));
1262 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1263 ieee80211_has_protected(fc)) {
1264 /* Store CCMP PN so that we can verify that the next
1265 * fragment has a sequential PN value. */
1267 memcpy(entry->last_pn,
1268 rx->key->u.ccmp.rx_pn[rx->queue],
1274 /* This is a fragment for a frame that should already be pending in
1275 * fragment cache. Add this fragment to the end of the pending entry.
1277 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1279 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1280 return RX_DROP_MONITOR;
1283 /* Verify that MPDUs within one MSDU have sequential PN values.
1284 * (IEEE 802.11i, 8.3.3.4.5) */
1287 u8 pn[CCMP_PN_LEN], *rpn;
1288 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1289 return RX_DROP_UNUSABLE;
1290 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1291 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1296 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1297 if (memcmp(pn, rpn, CCMP_PN_LEN))
1298 return RX_DROP_UNUSABLE;
1299 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1302 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1303 __skb_queue_tail(&entry->skb_list, rx->skb);
1304 entry->last_frag = frag;
1305 entry->extra_len += rx->skb->len;
1306 if (ieee80211_has_morefrags(fc)) {
1311 rx->skb = __skb_dequeue(&entry->skb_list);
1312 if (skb_tailroom(rx->skb) < entry->extra_len) {
1313 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1314 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1316 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1317 __skb_queue_purge(&entry->skb_list);
1318 return RX_DROP_UNUSABLE;
1321 while ((skb = __skb_dequeue(&entry->skb_list))) {
1322 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1326 /* Complete frame has been reassembled - process it now */
1327 rx->flags |= IEEE80211_RX_FRAGMENTED;
1331 rx->sta->rx_packets++;
1332 if (is_multicast_ether_addr(hdr->addr1))
1333 rx->local->dot11MulticastReceivedFrameCount++;
1335 ieee80211_led_rx(rx->local);
1339 static ieee80211_rx_result debug_noinline
1340 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1342 struct ieee80211_sub_if_data *sdata = rx->sdata;
1343 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1345 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1346 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1349 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1350 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1351 return RX_DROP_UNUSABLE;
1353 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1354 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1356 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1358 /* Free PS Poll skb here instead of returning RX_DROP that would
1359 * count as an dropped frame. */
1360 dev_kfree_skb(rx->skb);
1365 static ieee80211_rx_result debug_noinline
1366 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1368 u8 *data = rx->skb->data;
1369 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1371 if (!ieee80211_is_data_qos(hdr->frame_control))
1374 /* remove the qos control field, update frame type and meta-data */
1375 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1376 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1377 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1378 /* change frame type to non QOS */
1379 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1385 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1387 if (unlikely(!rx->sta ||
1388 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1395 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1397 struct sk_buff *skb = rx->skb;
1398 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1401 * Pass through unencrypted frames if the hardware has
1402 * decrypted them already.
1404 if (status->flag & RX_FLAG_DECRYPTED)
1407 /* Drop unencrypted frames if key is set. */
1408 if (unlikely(!ieee80211_has_protected(fc) &&
1409 !ieee80211_is_nullfunc(fc) &&
1410 ieee80211_is_data(fc) &&
1411 (rx->key || rx->sdata->drop_unencrypted)))
1418 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1420 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1421 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1422 __le16 fc = hdr->frame_control;
1425 * Pass through unencrypted frames if the hardware has
1426 * decrypted them already.
1428 if (status->flag & RX_FLAG_DECRYPTED)
1431 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1432 if (unlikely(!ieee80211_has_protected(fc) &&
1433 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1436 /* BIP does not use Protected field, so need to check MMIE */
1437 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1438 ieee80211_get_mmie_keyidx(rx->skb) < 0))
1441 * When using MFP, Action frames are not allowed prior to
1442 * having configured keys.
1444 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1445 ieee80211_is_robust_mgmt_frame(
1446 (struct ieee80211_hdr *) rx->skb->data)))
1454 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1456 struct ieee80211_sub_if_data *sdata = rx->sdata;
1457 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1459 if (ieee80211_has_a4(hdr->frame_control) &&
1460 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1463 if (is_multicast_ether_addr(hdr->addr1) &&
1464 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1465 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
1468 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1472 * requires that rx->skb is a frame with ethernet header
1474 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1476 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1477 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1478 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1481 * Allow EAPOL frames to us/the PAE group address regardless
1482 * of whether the frame was encrypted or not.
1484 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1485 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1486 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1489 if (ieee80211_802_1x_port_control(rx) ||
1490 ieee80211_drop_unencrypted(rx, fc))
1497 * requires that rx->skb is a frame with ethernet header
1500 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1502 struct ieee80211_sub_if_data *sdata = rx->sdata;
1503 struct net_device *dev = sdata->dev;
1504 struct sk_buff *skb, *xmit_skb;
1505 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1506 struct sta_info *dsta;
1511 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1512 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1513 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1514 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1515 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1516 if (is_multicast_ether_addr(ehdr->h_dest)) {
1518 * send multicast frames both to higher layers in
1519 * local net stack and back to the wireless medium
1521 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1522 if (!xmit_skb && net_ratelimit())
1523 printk(KERN_DEBUG "%s: failed to clone "
1524 "multicast frame\n", dev->name);
1526 dsta = sta_info_get(sdata, skb->data);
1529 * The destination station is associated to
1530 * this AP (in this VLAN), so send the frame
1531 * directly to it and do not pass it to local
1541 int align __maybe_unused;
1543 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1545 * 'align' will only take the values 0 or 2 here
1546 * since all frames are required to be aligned
1547 * to 2-byte boundaries when being passed to
1548 * mac80211. That also explains the __skb_push()
1551 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1553 if (WARN_ON(skb_headroom(skb) < 3)) {
1557 u8 *data = skb->data;
1558 size_t len = skb_headlen(skb);
1560 memmove(skb->data, data, len);
1561 skb_set_tail_pointer(skb, len);
1567 /* deliver to local stack */
1568 skb->protocol = eth_type_trans(skb, dev);
1569 memset(skb->cb, 0, sizeof(skb->cb));
1575 /* send to wireless media */
1576 xmit_skb->protocol = htons(ETH_P_802_3);
1577 skb_reset_network_header(xmit_skb);
1578 skb_reset_mac_header(xmit_skb);
1579 dev_queue_xmit(xmit_skb);
1583 static ieee80211_rx_result debug_noinline
1584 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1586 struct net_device *dev = rx->sdata->dev;
1587 struct sk_buff *skb = rx->skb;
1588 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1589 __le16 fc = hdr->frame_control;
1590 struct sk_buff_head frame_list;
1592 if (unlikely(!ieee80211_is_data(fc)))
1595 if (unlikely(!ieee80211_is_data_present(fc)))
1596 return RX_DROP_MONITOR;
1598 if (!(rx->flags & IEEE80211_RX_AMSDU))
1601 if (ieee80211_has_a4(hdr->frame_control) &&
1602 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1603 !rx->sdata->u.vlan.sta)
1604 return RX_DROP_UNUSABLE;
1606 if (is_multicast_ether_addr(hdr->addr1) &&
1607 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1608 rx->sdata->u.vlan.sta) ||
1609 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1610 rx->sdata->u.mgd.use_4addr)))
1611 return RX_DROP_UNUSABLE;
1614 __skb_queue_head_init(&frame_list);
1616 if (skb_linearize(skb))
1617 return RX_DROP_UNUSABLE;
1619 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1620 rx->sdata->vif.type,
1621 rx->local->hw.extra_tx_headroom);
1623 while (!skb_queue_empty(&frame_list)) {
1624 rx->skb = __skb_dequeue(&frame_list);
1626 if (!ieee80211_frame_allowed(rx, fc)) {
1627 dev_kfree_skb(rx->skb);
1630 dev->stats.rx_packets++;
1631 dev->stats.rx_bytes += rx->skb->len;
1633 ieee80211_deliver_skb(rx);
1639 #ifdef CONFIG_MAC80211_MESH
1640 static ieee80211_rx_result
1641 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1643 struct ieee80211_hdr *hdr;
1644 struct ieee80211s_hdr *mesh_hdr;
1645 unsigned int hdrlen;
1646 struct sk_buff *skb = rx->skb, *fwd_skb;
1647 struct ieee80211_local *local = rx->local;
1648 struct ieee80211_sub_if_data *sdata = rx->sdata;
1650 hdr = (struct ieee80211_hdr *) skb->data;
1651 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1652 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1654 if (!ieee80211_is_data(hdr->frame_control))
1659 return RX_DROP_MONITOR;
1661 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1662 struct mesh_path *mppath;
1666 if (is_multicast_ether_addr(hdr->addr1)) {
1667 mpp_addr = hdr->addr3;
1668 proxied_addr = mesh_hdr->eaddr1;
1670 mpp_addr = hdr->addr4;
1671 proxied_addr = mesh_hdr->eaddr2;
1675 mppath = mpp_path_lookup(proxied_addr, sdata);
1677 mpp_path_add(proxied_addr, mpp_addr, sdata);
1679 spin_lock_bh(&mppath->state_lock);
1680 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1681 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1682 spin_unlock_bh(&mppath->state_lock);
1687 /* Frame has reached destination. Don't forward */
1688 if (!is_multicast_ether_addr(hdr->addr1) &&
1689 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1694 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1696 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1697 dropped_frames_ttl);
1699 struct ieee80211_hdr *fwd_hdr;
1700 struct ieee80211_tx_info *info;
1702 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1704 if (!fwd_skb && net_ratelimit())
1705 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1708 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1709 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1710 info = IEEE80211_SKB_CB(fwd_skb);
1711 memset(info, 0, sizeof(*info));
1712 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1713 info->control.vif = &rx->sdata->vif;
1714 skb_set_queue_mapping(skb,
1715 ieee80211_select_queue(rx->sdata, fwd_skb));
1716 ieee80211_set_qos_hdr(local, skb);
1717 if (is_multicast_ether_addr(fwd_hdr->addr1))
1718 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1723 * Save TA to addr1 to send TA a path error if a
1724 * suitable next hop is not found
1726 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1728 err = mesh_nexthop_lookup(fwd_skb, sdata);
1729 /* Failed to immediately resolve next hop:
1730 * fwded frame was dropped or will be added
1731 * later to the pending skb queue. */
1733 return RX_DROP_MONITOR;
1735 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1738 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1740 ieee80211_add_pending_skb(local, fwd_skb);
1744 if (is_multicast_ether_addr(hdr->addr1) ||
1745 sdata->dev->flags & IFF_PROMISC)
1748 return RX_DROP_MONITOR;
1752 static ieee80211_rx_result debug_noinline
1753 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1755 struct ieee80211_sub_if_data *sdata = rx->sdata;
1756 struct ieee80211_local *local = rx->local;
1757 struct net_device *dev = sdata->dev;
1758 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1759 __le16 fc = hdr->frame_control;
1762 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1765 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1766 return RX_DROP_MONITOR;
1769 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1770 * that a 4-addr station can be detected and moved into a separate VLAN
1772 if (ieee80211_has_a4(hdr->frame_control) &&
1773 sdata->vif.type == NL80211_IFTYPE_AP)
1774 return RX_DROP_MONITOR;
1776 err = __ieee80211_data_to_8023(rx);
1778 return RX_DROP_UNUSABLE;
1780 if (!ieee80211_frame_allowed(rx, fc))
1781 return RX_DROP_MONITOR;
1785 dev->stats.rx_packets++;
1786 dev->stats.rx_bytes += rx->skb->len;
1788 if (ieee80211_is_data(hdr->frame_control) &&
1789 !is_multicast_ether_addr(hdr->addr1) &&
1790 local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1791 mod_timer(&local->dynamic_ps_timer, jiffies +
1792 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1795 ieee80211_deliver_skb(rx);
1800 static ieee80211_rx_result debug_noinline
1801 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
1803 struct ieee80211_local *local = rx->local;
1804 struct ieee80211_hw *hw = &local->hw;
1805 struct sk_buff *skb = rx->skb;
1806 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1807 struct tid_ampdu_rx *tid_agg_rx;
1811 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1814 if (ieee80211_is_back_req(bar->frame_control)) {
1816 return RX_DROP_MONITOR;
1817 spin_lock(&rx->sta->lock);
1818 tid = le16_to_cpu(bar->control) >> 12;
1819 if (!rx->sta->ampdu_mlme.tid_active_rx[tid]) {
1820 spin_unlock(&rx->sta->lock);
1821 return RX_DROP_MONITOR;
1823 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1825 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1827 /* reset session timer */
1828 if (tid_agg_rx->timeout)
1829 mod_timer(&tid_agg_rx->session_timer,
1830 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1832 /* release stored frames up to start of BAR */
1833 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1836 spin_unlock(&rx->sta->lock);
1843 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1844 struct ieee80211_mgmt *mgmt,
1847 struct ieee80211_local *local = sdata->local;
1848 struct sk_buff *skb;
1849 struct ieee80211_mgmt *resp;
1851 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
1852 /* Not to own unicast address */
1856 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1857 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1858 /* Not from the current AP or not associated yet. */
1862 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1863 /* Too short SA Query request frame */
1867 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1871 skb_reserve(skb, local->hw.extra_tx_headroom);
1872 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1873 memset(resp, 0, 24);
1874 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1875 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
1876 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1877 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1878 IEEE80211_STYPE_ACTION);
1879 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1880 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1881 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1882 memcpy(resp->u.action.u.sa_query.trans_id,
1883 mgmt->u.action.u.sa_query.trans_id,
1884 WLAN_SA_QUERY_TR_ID_LEN);
1886 ieee80211_tx_skb(sdata, skb);
1889 static ieee80211_rx_result debug_noinline
1890 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1892 struct ieee80211_local *local = rx->local;
1893 struct ieee80211_sub_if_data *sdata = rx->sdata;
1894 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1895 struct sk_buff *nskb;
1896 struct ieee80211_rx_status *status;
1897 int len = rx->skb->len;
1899 if (!ieee80211_is_action(mgmt->frame_control))
1902 /* drop too small frames */
1903 if (len < IEEE80211_MIN_ACTION_SIZE)
1904 return RX_DROP_UNUSABLE;
1906 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
1907 return RX_DROP_UNUSABLE;
1909 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1910 return RX_DROP_UNUSABLE;
1912 if (ieee80211_drop_unencrypted_mgmt(rx))
1913 return RX_DROP_UNUSABLE;
1915 switch (mgmt->u.action.category) {
1916 case WLAN_CATEGORY_BACK:
1918 * The aggregation code is not prepared to handle
1919 * anything but STA/AP due to the BSSID handling;
1920 * IBSS could work in the code but isn't supported
1921 * by drivers or the standard.
1923 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1924 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1925 sdata->vif.type != NL80211_IFTYPE_AP)
1928 /* verify action_code is present */
1929 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1932 switch (mgmt->u.action.u.addba_req.action_code) {
1933 case WLAN_ACTION_ADDBA_REQ:
1934 if (len < (IEEE80211_MIN_ACTION_SIZE +
1935 sizeof(mgmt->u.action.u.addba_req)))
1936 return RX_DROP_MONITOR;
1937 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1939 case WLAN_ACTION_ADDBA_RESP:
1940 if (len < (IEEE80211_MIN_ACTION_SIZE +
1941 sizeof(mgmt->u.action.u.addba_resp)))
1943 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1945 case WLAN_ACTION_DELBA:
1946 if (len < (IEEE80211_MIN_ACTION_SIZE +
1947 sizeof(mgmt->u.action.u.delba)))
1949 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1953 case WLAN_CATEGORY_SPECTRUM_MGMT:
1954 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1957 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1960 /* verify action_code is present */
1961 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1964 switch (mgmt->u.action.u.measurement.action_code) {
1965 case WLAN_ACTION_SPCT_MSR_REQ:
1966 if (len < (IEEE80211_MIN_ACTION_SIZE +
1967 sizeof(mgmt->u.action.u.measurement)))
1969 ieee80211_process_measurement_req(sdata, mgmt, len);
1971 case WLAN_ACTION_SPCT_CHL_SWITCH:
1972 if (len < (IEEE80211_MIN_ACTION_SIZE +
1973 sizeof(mgmt->u.action.u.chan_switch)))
1976 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1979 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1982 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1985 case WLAN_CATEGORY_SA_QUERY:
1986 if (len < (IEEE80211_MIN_ACTION_SIZE +
1987 sizeof(mgmt->u.action.u.sa_query)))
1990 switch (mgmt->u.action.u.sa_query.action) {
1991 case WLAN_ACTION_SA_QUERY_REQUEST:
1992 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1994 ieee80211_process_sa_query_req(sdata, mgmt, len);
1998 case WLAN_CATEGORY_MESH_PLINK:
1999 case WLAN_CATEGORY_MESH_PATH_SEL:
2000 if (ieee80211_vif_is_mesh(&sdata->vif))
2001 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
2006 * For AP mode, hostapd is responsible for handling any action
2007 * frames that we didn't handle, including returning unknown
2008 * ones. For all other modes we will return them to the sender,
2009 * setting the 0x80 bit in the action category, as required by
2010 * 802.11-2007 7.3.1.11.
2012 if (sdata->vif.type == NL80211_IFTYPE_AP ||
2013 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2014 return RX_DROP_MONITOR;
2017 * Getting here means the kernel doesn't know how to handle
2018 * it, but maybe userspace does ... include returned frames
2019 * so userspace can register for those to know whether ones
2020 * it transmitted were processed or returned.
2022 status = IEEE80211_SKB_RXCB(rx->skb);
2024 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2025 cfg80211_rx_action(rx->sdata->dev, status->freq,
2026 rx->skb->data, rx->skb->len,
2030 /* do not return rejected action frames */
2031 if (mgmt->u.action.category & 0x80)
2032 return RX_DROP_UNUSABLE;
2034 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2037 struct ieee80211_mgmt *mgmt = (void *)nskb->data;
2039 mgmt->u.action.category |= 0x80;
2040 memcpy(mgmt->da, mgmt->sa, ETH_ALEN);
2041 memcpy(mgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2043 memset(nskb->cb, 0, sizeof(nskb->cb));
2045 ieee80211_tx_skb(rx->sdata, nskb);
2050 rx->sta->rx_packets++;
2051 dev_kfree_skb(rx->skb);
2055 static ieee80211_rx_result debug_noinline
2056 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2058 struct ieee80211_sub_if_data *sdata = rx->sdata;
2059 ieee80211_rx_result rxs;
2061 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
2062 return RX_DROP_MONITOR;
2064 if (ieee80211_drop_unencrypted_mgmt(rx))
2065 return RX_DROP_UNUSABLE;
2067 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2068 if (rxs != RX_CONTINUE)
2071 if (ieee80211_vif_is_mesh(&sdata->vif))
2072 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
2074 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2075 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
2077 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2078 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
2080 return RX_DROP_MONITOR;
2083 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
2084 struct ieee80211_rx_data *rx)
2087 unsigned int hdrlen;
2089 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2090 if (rx->skb->len >= hdrlen + 4)
2091 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2097 * Some hardware seem to generate incorrect Michael MIC
2098 * reports; ignore them to avoid triggering countermeasures.
2103 if (!ieee80211_has_protected(hdr->frame_control))
2106 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
2108 * APs with pairwise keys should never receive Michael MIC
2109 * errors for non-zero keyidx because these are reserved for
2110 * group keys and only the AP is sending real multicast
2111 * frames in the BSS.
2116 if (!ieee80211_is_data(hdr->frame_control) &&
2117 !ieee80211_is_auth(hdr->frame_control))
2120 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2124 /* TODO: use IEEE80211_RX_FRAGMENTED */
2125 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2126 struct ieee80211_rate *rate)
2128 struct ieee80211_sub_if_data *sdata;
2129 struct ieee80211_local *local = rx->local;
2130 struct ieee80211_rtap_hdr {
2131 struct ieee80211_radiotap_header hdr;
2136 } __attribute__ ((packed)) *rthdr;
2137 struct sk_buff *skb = rx->skb, *skb2;
2138 struct net_device *prev_dev = NULL;
2139 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2141 if (status->flag & RX_FLAG_INTERNAL_CMTR)
2144 if (skb_headroom(skb) < sizeof(*rthdr) &&
2145 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2148 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2149 memset(rthdr, 0, sizeof(*rthdr));
2150 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2151 rthdr->hdr.it_present =
2152 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2153 (1 << IEEE80211_RADIOTAP_CHANNEL));
2156 rthdr->rate_or_pad = rate->bitrate / 5;
2157 rthdr->hdr.it_present |=
2158 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2160 rthdr->chan_freq = cpu_to_le16(status->freq);
2162 if (status->band == IEEE80211_BAND_5GHZ)
2163 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2164 IEEE80211_CHAN_5GHZ);
2166 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2167 IEEE80211_CHAN_2GHZ);
2169 skb_set_mac_header(skb, 0);
2170 skb->ip_summed = CHECKSUM_UNNECESSARY;
2171 skb->pkt_type = PACKET_OTHERHOST;
2172 skb->protocol = htons(ETH_P_802_2);
2174 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2175 if (!ieee80211_sdata_running(sdata))
2178 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2179 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2183 skb2 = skb_clone(skb, GFP_ATOMIC);
2185 skb2->dev = prev_dev;
2190 prev_dev = sdata->dev;
2191 sdata->dev->stats.rx_packets++;
2192 sdata->dev->stats.rx_bytes += skb->len;
2196 skb->dev = prev_dev;
2202 status->flag |= RX_FLAG_INTERNAL_CMTR;
2210 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
2211 struct ieee80211_rx_data *rx,
2212 struct sk_buff *skb,
2213 struct ieee80211_rate *rate)
2215 struct sk_buff_head reorder_release;
2216 ieee80211_rx_result res = RX_DROP_MONITOR;
2218 __skb_queue_head_init(&reorder_release);
2223 #define CALL_RXH(rxh) \
2226 if (res != RX_CONTINUE) \
2231 * NB: the rxh_next label works even if we jump
2232 * to it from here because then the list will
2233 * be empty, which is a trivial check
2235 CALL_RXH(ieee80211_rx_h_passive_scan)
2236 CALL_RXH(ieee80211_rx_h_check)
2238 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2240 while ((skb = __skb_dequeue(&reorder_release))) {
2242 * all the other fields are valid across frames
2243 * that belong to an aMPDU since they are on the
2244 * same TID from the same station
2248 CALL_RXH(ieee80211_rx_h_decrypt)
2249 CALL_RXH(ieee80211_rx_h_check_more_data)
2250 CALL_RXH(ieee80211_rx_h_sta_process)
2251 CALL_RXH(ieee80211_rx_h_defragment)
2252 CALL_RXH(ieee80211_rx_h_ps_poll)
2253 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2254 /* must be after MMIC verify so header is counted in MPDU mic */
2255 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2256 CALL_RXH(ieee80211_rx_h_amsdu)
2257 #ifdef CONFIG_MAC80211_MESH
2258 if (ieee80211_vif_is_mesh(&sdata->vif))
2259 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2261 CALL_RXH(ieee80211_rx_h_data)
2263 /* special treatment -- needs the queue */
2264 res = ieee80211_rx_h_ctrl(rx, &reorder_release);
2265 if (res != RX_CONTINUE)
2268 CALL_RXH(ieee80211_rx_h_action)
2269 CALL_RXH(ieee80211_rx_h_mgmt)
2275 case RX_DROP_MONITOR:
2276 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2278 rx->sta->rx_dropped++;
2281 ieee80211_rx_cooked_monitor(rx, rate);
2283 case RX_DROP_UNUSABLE:
2284 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2286 rx->sta->rx_dropped++;
2287 dev_kfree_skb(rx->skb);
2290 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2296 /* main receive path */
2298 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2299 struct ieee80211_rx_data *rx,
2300 struct ieee80211_hdr *hdr)
2302 struct sk_buff *skb = rx->skb;
2303 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2304 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2305 int multicast = is_multicast_ether_addr(hdr->addr1);
2307 switch (sdata->vif.type) {
2308 case NL80211_IFTYPE_STATION:
2309 if (!bssid && !sdata->u.mgd.use_4addr)
2312 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2313 if (!(sdata->dev->flags & IFF_PROMISC))
2315 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2318 case NL80211_IFTYPE_ADHOC:
2321 if (ieee80211_is_beacon(hdr->frame_control)) {
2324 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2325 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2327 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2328 } else if (!multicast &&
2329 compare_ether_addr(sdata->vif.addr,
2331 if (!(sdata->dev->flags & IFF_PROMISC))
2333 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2334 } else if (!rx->sta) {
2336 if (status->flag & RX_FLAG_HT)
2337 rate_idx = 0; /* TODO: HT rates */
2339 rate_idx = status->rate_idx;
2340 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2341 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2344 case NL80211_IFTYPE_MESH_POINT:
2346 compare_ether_addr(sdata->vif.addr,
2348 if (!(sdata->dev->flags & IFF_PROMISC))
2351 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2354 case NL80211_IFTYPE_AP_VLAN:
2355 case NL80211_IFTYPE_AP:
2357 if (compare_ether_addr(sdata->vif.addr,
2360 } else if (!ieee80211_bssid_match(bssid,
2362 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2364 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2367 case NL80211_IFTYPE_WDS:
2368 if (bssid || !ieee80211_is_data(hdr->frame_control))
2370 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2373 case NL80211_IFTYPE_MONITOR:
2374 case NL80211_IFTYPE_UNSPECIFIED:
2375 case __NL80211_IFTYPE_AFTER_LAST:
2376 /* should never get here */
2385 * This is the actual Rx frames handler. as it blongs to Rx path it must
2386 * be called with rcu_read_lock protection.
2388 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2389 struct sk_buff *skb,
2390 struct ieee80211_rate *rate)
2392 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2393 struct ieee80211_local *local = hw_to_local(hw);
2394 struct ieee80211_sub_if_data *sdata;
2395 struct ieee80211_hdr *hdr;
2397 struct ieee80211_rx_data rx;
2399 struct ieee80211_sub_if_data *prev = NULL;
2400 struct sk_buff *skb_new;
2401 struct sta_info *sta, *tmp;
2402 bool found_sta = false;
2405 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2406 memset(&rx, 0, sizeof(rx));
2410 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2411 local->dot11ReceivedFragmentCount++;
2413 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2414 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2415 rx.flags |= IEEE80211_RX_IN_SCAN;
2417 if (ieee80211_is_mgmt(fc))
2418 err = skb_linearize(skb);
2420 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2427 hdr = (struct ieee80211_hdr *)skb->data;
2428 ieee80211_parse_qos(&rx);
2429 ieee80211_verify_alignment(&rx);
2431 if (ieee80211_is_data(fc)) {
2432 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2435 rx.sdata = sta->sdata;
2437 rx.flags |= IEEE80211_RX_RA_MATCH;
2438 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2440 if (status->flag & RX_FLAG_MMIC_ERROR) {
2441 if (rx.flags & IEEE80211_RX_RA_MATCH)
2442 ieee80211_rx_michael_mic_report(hdr, &rx);
2449 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2450 if (!ieee80211_sdata_running(sdata))
2453 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2454 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2458 * frame is destined for this interface, but if it's
2459 * not also for the previous one we handle that after
2460 * the loop to avoid copying the SKB once too much
2468 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2470 rx.flags |= IEEE80211_RX_RA_MATCH;
2471 prepares = prepare_for_handlers(prev, &rx, hdr);
2476 if (status->flag & RX_FLAG_MMIC_ERROR) {
2478 if (rx.flags & IEEE80211_RX_RA_MATCH)
2479 ieee80211_rx_michael_mic_report(hdr,
2485 * frame was destined for the previous interface
2486 * so invoke RX handlers for it
2489 skb_new = skb_copy(skb, GFP_ATOMIC);
2491 if (net_ratelimit())
2492 printk(KERN_DEBUG "%s: failed to copy "
2493 "multicast frame for %s\n",
2494 wiphy_name(local->hw.wiphy),
2498 ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate);
2504 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2506 rx.flags |= IEEE80211_RX_RA_MATCH;
2507 prepares = prepare_for_handlers(prev, &rx, hdr);
2514 ieee80211_invoke_rx_handlers(prev, &rx, skb, rate);
2520 * This is the receive path handler. It is called by a low level driver when an
2521 * 802.11 MPDU is received from the hardware.
2523 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2525 struct ieee80211_local *local = hw_to_local(hw);
2526 struct ieee80211_rate *rate = NULL;
2527 struct ieee80211_supported_band *sband;
2528 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2530 WARN_ON_ONCE(softirq_count() == 0);
2532 if (WARN_ON(status->band < 0 ||
2533 status->band >= IEEE80211_NUM_BANDS))
2536 sband = local->hw.wiphy->bands[status->band];
2537 if (WARN_ON(!sband))
2541 * If we're suspending, it is possible although not too likely
2542 * that we'd be receiving frames after having already partially
2543 * quiesced the stack. We can't process such frames then since
2544 * that might, for example, cause stations to be added or other
2545 * driver callbacks be invoked.
2547 if (unlikely(local->quiescing || local->suspended))
2551 * The same happens when we're not even started,
2552 * but that's worth a warning.
2554 if (WARN_ON(!local->started))
2557 if (status->flag & RX_FLAG_HT) {
2559 * rate_idx is MCS index, which can be [0-76] as documented on:
2561 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2563 * Anything else would be some sort of driver or hardware error.
2564 * The driver should catch hardware errors.
2566 if (WARN((status->rate_idx < 0 ||
2567 status->rate_idx > 76),
2568 "Rate marked as an HT rate but passed "
2569 "status->rate_idx is not "
2570 "an MCS index [0-76]: %d (0x%02x)\n",
2575 if (WARN_ON(status->rate_idx < 0 ||
2576 status->rate_idx >= sband->n_bitrates))
2578 rate = &sband->bitrates[status->rate_idx];
2582 * key references and virtual interfaces are protected using RCU
2583 * and this requires that we are in a read-side RCU section during
2584 * receive processing
2589 * Frames with failed FCS/PLCP checksum are not returned,
2590 * all other frames are returned without radiotap header
2591 * if it was previously present.
2592 * Also, frames with less than 16 bytes are dropped.
2594 skb = ieee80211_rx_monitor(local, skb, rate);
2600 __ieee80211_rx_handle_packet(hw, skb, rate);
2608 EXPORT_SYMBOL(ieee80211_rx);
2610 /* This is a version of the rx handler that can be called from hard irq
2611 * context. Post the skb on the queue and schedule the tasklet */
2612 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2614 struct ieee80211_local *local = hw_to_local(hw);
2616 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2618 skb->pkt_type = IEEE80211_RX_MSG;
2619 skb_queue_tail(&local->skb_queue, skb);
2620 tasklet_schedule(&local->tasklet);
2622 EXPORT_SYMBOL(ieee80211_rx_irqsafe);