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 <linux/export.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
22 #include <asm/unaligned.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
35 * monitor mode reception
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
45 __pskb_trim(skb, skb->len - FCS_LEN);
57 static inline int should_drop_frame(struct sk_buff *skb,
60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
61 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
65 if (unlikely(skb->len < 16 + present_fcs_len))
67 if (ieee80211_is_ctl(hdr->frame_control) &&
68 !ieee80211_is_pspoll(hdr->frame_control) &&
69 !ieee80211_is_back_req(hdr->frame_control))
75 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
76 struct ieee80211_rx_status *status)
80 /* always present fields */
81 len = sizeof(struct ieee80211_radiotap_header) + 9;
83 if (status->flag & RX_FLAG_MACTIME_MPDU)
85 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
88 if (len & 1) /* padding for RX_FLAGS if necessary */
91 if (status->flag & RX_FLAG_HT) /* HT info */
98 * ieee80211_add_rx_radiotap_header - add radiotap header
100 * add a radiotap header containing all the fields which the hardware provided.
103 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
105 struct ieee80211_rate *rate,
108 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
109 struct ieee80211_radiotap_header *rthdr;
113 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
114 memset(rthdr, 0, rtap_len);
116 /* radiotap header, set always present flags */
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
119 (1 << IEEE80211_RADIOTAP_CHANNEL) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
122 rthdr->it_len = cpu_to_le16(rtap_len);
124 pos = (unsigned char *)(rthdr+1);
126 /* the order of the following fields is important */
128 /* IEEE80211_RADIOTAP_TSFT */
129 if (status->flag & RX_FLAG_MACTIME_MPDU) {
130 put_unaligned_le64(status->mactime, pos);
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
136 /* IEEE80211_RADIOTAP_FLAGS */
137 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
138 *pos |= IEEE80211_RADIOTAP_F_FCS;
139 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
140 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
141 if (status->flag & RX_FLAG_SHORTPRE)
142 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
145 /* IEEE80211_RADIOTAP_RATE */
146 if (!rate || status->flag & RX_FLAG_HT) {
148 * Without rate information don't add it. If we have,
149 * MCS information is a separate field in radiotap,
150 * added below. The byte here is needed as padding
151 * for the channel though, so initialise it to 0.
155 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
156 *pos = rate->bitrate / 5;
160 /* IEEE80211_RADIOTAP_CHANNEL */
161 put_unaligned_le16(status->freq, pos);
163 if (status->band == IEEE80211_BAND_5GHZ)
164 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
166 else if (status->flag & RX_FLAG_HT)
167 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
169 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
170 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
173 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
176 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
180 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
181 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
182 *pos = status->signal;
184 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
188 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
190 /* IEEE80211_RADIOTAP_ANTENNA */
191 *pos = status->antenna;
194 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
196 /* IEEE80211_RADIOTAP_RX_FLAGS */
197 /* ensure 2 byte alignment for the 2 byte field as required */
198 if ((pos - (u8 *)rthdr) & 1)
200 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
201 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
202 put_unaligned_le16(rx_flags, pos);
205 if (status->flag & RX_FLAG_HT) {
206 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
207 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
208 IEEE80211_RADIOTAP_MCS_HAVE_GI |
209 IEEE80211_RADIOTAP_MCS_HAVE_BW;
211 if (status->flag & RX_FLAG_SHORT_GI)
212 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
213 if (status->flag & RX_FLAG_40MHZ)
214 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
216 *pos++ = status->rate_idx;
221 * This function copies a received frame to all monitor interfaces and
222 * returns a cleaned-up SKB that no longer includes the FCS nor the
223 * radiotap header the driver might have added.
225 static struct sk_buff *
226 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
227 struct ieee80211_rate *rate)
229 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
230 struct ieee80211_sub_if_data *sdata;
232 struct sk_buff *skb, *skb2;
233 struct net_device *prev_dev = NULL;
234 int present_fcs_len = 0;
237 * First, we may need to make a copy of the skb because
238 * (1) we need to modify it for radiotap (if not present), and
239 * (2) the other RX handlers will modify the skb we got.
241 * We don't need to, of course, if we aren't going to return
242 * the SKB because it has a bad FCS/PLCP checksum.
245 /* room for the radiotap header based on driver features */
246 needed_headroom = ieee80211_rx_radiotap_len(local, status);
248 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
249 present_fcs_len = FCS_LEN;
251 /* make sure hdr->frame_control is on the linear part */
252 if (!pskb_may_pull(origskb, 2)) {
253 dev_kfree_skb(origskb);
257 if (!local->monitors) {
258 if (should_drop_frame(origskb, present_fcs_len)) {
259 dev_kfree_skb(origskb);
263 return remove_monitor_info(local, origskb);
266 if (should_drop_frame(origskb, present_fcs_len)) {
267 /* only need to expand headroom if necessary */
272 * This shouldn't trigger often because most devices have an
273 * RX header they pull before we get here, and that should
274 * be big enough for our radiotap information. We should
275 * probably export the length to drivers so that we can have
276 * them allocate enough headroom to start with.
278 if (skb_headroom(skb) < needed_headroom &&
279 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
285 * Need to make a copy and possibly remove radiotap header
286 * and FCS from the original.
288 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
290 origskb = remove_monitor_info(local, origskb);
296 /* prepend radiotap information */
297 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
299 skb_reset_mac_header(skb);
300 skb->ip_summed = CHECKSUM_UNNECESSARY;
301 skb->pkt_type = PACKET_OTHERHOST;
302 skb->protocol = htons(ETH_P_802_2);
304 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
305 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
308 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
311 if (!ieee80211_sdata_running(sdata))
315 skb2 = skb_clone(skb, GFP_ATOMIC);
317 skb2->dev = prev_dev;
318 netif_receive_skb(skb2);
322 prev_dev = sdata->dev;
323 sdata->dev->stats.rx_packets++;
324 sdata->dev->stats.rx_bytes += skb->len;
329 netif_receive_skb(skb);
337 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
339 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
340 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
341 int tid, seqno_idx, security_idx;
343 /* does the frame have a qos control field? */
344 if (ieee80211_is_data_qos(hdr->frame_control)) {
345 u8 *qc = ieee80211_get_qos_ctl(hdr);
346 /* frame has qos control */
347 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
348 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
349 status->rx_flags |= IEEE80211_RX_AMSDU;
355 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
357 * Sequence numbers for management frames, QoS data
358 * frames with a broadcast/multicast address in the
359 * Address 1 field, and all non-QoS data frames sent
360 * by QoS STAs are assigned using an additional single
361 * modulo-4096 counter, [...]
363 * We also use that counter for non-QoS STAs.
365 seqno_idx = NUM_RX_DATA_QUEUES;
367 if (ieee80211_is_mgmt(hdr->frame_control))
368 security_idx = NUM_RX_DATA_QUEUES;
372 rx->seqno_idx = seqno_idx;
373 rx->security_idx = security_idx;
374 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
375 * For now, set skb->priority to 0 for other cases. */
376 rx->skb->priority = (tid > 7) ? 0 : tid;
380 * DOC: Packet alignment
382 * Drivers always need to pass packets that are aligned to two-byte boundaries
385 * Additionally, should, if possible, align the payload data in a way that
386 * guarantees that the contained IP header is aligned to a four-byte
387 * boundary. In the case of regular frames, this simply means aligning the
388 * payload to a four-byte boundary (because either the IP header is directly
389 * contained, or IV/RFC1042 headers that have a length divisible by four are
390 * in front of it). If the payload data is not properly aligned and the
391 * architecture doesn't support efficient unaligned operations, mac80211
392 * will align the data.
394 * With A-MSDU frames, however, the payload data address must yield two modulo
395 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
396 * push the IP header further back to a multiple of four again. Thankfully, the
397 * specs were sane enough this time around to require padding each A-MSDU
398 * subframe to a length that is a multiple of four.
400 * Padding like Atheros hardware adds which is between the 802.11 header and
401 * the payload is not supported, the driver is required to move the 802.11
402 * header to be directly in front of the payload in that case.
404 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
406 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
407 WARN_ONCE((unsigned long)rx->skb->data & 1,
408 "unaligned packet at 0x%p\n", rx->skb->data);
415 static ieee80211_rx_result debug_noinline
416 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
418 struct ieee80211_local *local = rx->local;
419 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
420 struct sk_buff *skb = rx->skb;
422 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
423 !local->sched_scanning))
426 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
427 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
428 local->sched_scanning)
429 return ieee80211_scan_rx(rx->sdata, skb);
431 /* scanning finished during invoking of handlers */
432 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
433 return RX_DROP_UNUSABLE;
437 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
439 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
441 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
444 return ieee80211_is_robust_mgmt_frame(hdr);
448 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
450 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
452 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
455 return ieee80211_is_robust_mgmt_frame(hdr);
459 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
460 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
462 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
463 struct ieee80211_mmie *mmie;
465 if (skb->len < 24 + sizeof(*mmie) ||
466 !is_multicast_ether_addr(hdr->da))
469 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
470 return -1; /* not a robust management frame */
472 mmie = (struct ieee80211_mmie *)
473 (skb->data + skb->len - sizeof(*mmie));
474 if (mmie->element_id != WLAN_EID_MMIE ||
475 mmie->length != sizeof(*mmie) - 2)
478 return le16_to_cpu(mmie->key_id);
482 static ieee80211_rx_result
483 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
485 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
486 char *dev_addr = rx->sdata->vif.addr;
488 if (ieee80211_is_data(hdr->frame_control)) {
489 if (is_multicast_ether_addr(hdr->addr1)) {
490 if (ieee80211_has_tods(hdr->frame_control) ||
491 !ieee80211_has_fromds(hdr->frame_control))
492 return RX_DROP_MONITOR;
493 if (compare_ether_addr(hdr->addr3, dev_addr) == 0)
494 return RX_DROP_MONITOR;
496 if (!ieee80211_has_a4(hdr->frame_control))
497 return RX_DROP_MONITOR;
498 if (compare_ether_addr(hdr->addr4, dev_addr) == 0)
499 return RX_DROP_MONITOR;
503 /* If there is not an established peer link and this is not a peer link
504 * establisment frame, beacon or probe, drop the frame.
507 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
508 struct ieee80211_mgmt *mgmt;
510 if (!ieee80211_is_mgmt(hdr->frame_control))
511 return RX_DROP_MONITOR;
513 if (ieee80211_is_action(hdr->frame_control)) {
515 mgmt = (struct ieee80211_mgmt *)hdr;
516 category = mgmt->u.action.category;
517 if (category != WLAN_CATEGORY_MESH_ACTION &&
518 category != WLAN_CATEGORY_SELF_PROTECTED)
519 return RX_DROP_MONITOR;
523 if (ieee80211_is_probe_req(hdr->frame_control) ||
524 ieee80211_is_probe_resp(hdr->frame_control) ||
525 ieee80211_is_beacon(hdr->frame_control) ||
526 ieee80211_is_auth(hdr->frame_control))
529 return RX_DROP_MONITOR;
536 #define SEQ_MODULO 0x1000
537 #define SEQ_MASK 0xfff
539 static inline int seq_less(u16 sq1, u16 sq2)
541 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
544 static inline u16 seq_inc(u16 sq)
546 return (sq + 1) & SEQ_MASK;
549 static inline u16 seq_sub(u16 sq1, u16 sq2)
551 return (sq1 - sq2) & SEQ_MASK;
555 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
556 struct tid_ampdu_rx *tid_agg_rx,
559 struct ieee80211_local *local = hw_to_local(hw);
560 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
561 struct ieee80211_rx_status *status;
563 lockdep_assert_held(&tid_agg_rx->reorder_lock);
568 /* release the frame from the reorder ring buffer */
569 tid_agg_rx->stored_mpdu_num--;
570 tid_agg_rx->reorder_buf[index] = NULL;
571 status = IEEE80211_SKB_RXCB(skb);
572 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
573 skb_queue_tail(&local->rx_skb_queue, skb);
576 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
579 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
580 struct tid_ampdu_rx *tid_agg_rx,
585 lockdep_assert_held(&tid_agg_rx->reorder_lock);
587 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
588 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
589 tid_agg_rx->buf_size;
590 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
595 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
596 * the skb was added to the buffer longer than this time ago, the earlier
597 * frames that have not yet been received are assumed to be lost and the skb
598 * can be released for processing. This may also release other skb's from the
599 * reorder buffer if there are no additional gaps between the frames.
601 * Callers must hold tid_agg_rx->reorder_lock.
603 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
605 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
606 struct tid_ampdu_rx *tid_agg_rx)
610 lockdep_assert_held(&tid_agg_rx->reorder_lock);
612 /* release the buffer until next missing frame */
613 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
614 tid_agg_rx->buf_size;
615 if (!tid_agg_rx->reorder_buf[index] &&
616 tid_agg_rx->stored_mpdu_num) {
618 * No buffers ready to be released, but check whether any
619 * frames in the reorder buffer have timed out.
622 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
623 j = (j + 1) % tid_agg_rx->buf_size) {
624 if (!tid_agg_rx->reorder_buf[j]) {
629 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
630 HT_RX_REORDER_BUF_TIMEOUT))
631 goto set_release_timer;
633 #ifdef CONFIG_MAC80211_HT_DEBUG
635 wiphy_debug(hw->wiphy,
636 "release an RX reorder frame due to timeout on earlier frames\n");
638 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
641 * Increment the head seq# also for the skipped slots.
643 tid_agg_rx->head_seq_num =
644 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
647 } else while (tid_agg_rx->reorder_buf[index]) {
648 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
649 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
650 tid_agg_rx->buf_size;
653 if (tid_agg_rx->stored_mpdu_num) {
654 j = index = seq_sub(tid_agg_rx->head_seq_num,
655 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
657 for (; j != (index - 1) % tid_agg_rx->buf_size;
658 j = (j + 1) % tid_agg_rx->buf_size) {
659 if (tid_agg_rx->reorder_buf[j])
665 mod_timer(&tid_agg_rx->reorder_timer,
666 tid_agg_rx->reorder_time[j] + 1 +
667 HT_RX_REORDER_BUF_TIMEOUT);
669 del_timer(&tid_agg_rx->reorder_timer);
674 * As this function belongs to the RX path it must be under
675 * rcu_read_lock protection. It returns false if the frame
676 * can be processed immediately, true if it was consumed.
678 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
679 struct tid_ampdu_rx *tid_agg_rx,
682 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
683 u16 sc = le16_to_cpu(hdr->seq_ctrl);
684 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
685 u16 head_seq_num, buf_size;
689 spin_lock(&tid_agg_rx->reorder_lock);
691 buf_size = tid_agg_rx->buf_size;
692 head_seq_num = tid_agg_rx->head_seq_num;
694 /* frame with out of date sequence number */
695 if (seq_less(mpdu_seq_num, head_seq_num)) {
701 * If frame the sequence number exceeds our buffering window
702 * size release some previous frames to make room for this one.
704 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
705 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
706 /* release stored frames up to new head to stack */
707 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
710 /* Now the new frame is always in the range of the reordering buffer */
712 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
714 /* check if we already stored this frame */
715 if (tid_agg_rx->reorder_buf[index]) {
721 * If the current MPDU is in the right order and nothing else
722 * is stored we can process it directly, no need to buffer it.
723 * If it is first but there's something stored, we may be able
724 * to release frames after this one.
726 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
727 tid_agg_rx->stored_mpdu_num == 0) {
728 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
733 /* put the frame in the reordering buffer */
734 tid_agg_rx->reorder_buf[index] = skb;
735 tid_agg_rx->reorder_time[index] = jiffies;
736 tid_agg_rx->stored_mpdu_num++;
737 ieee80211_sta_reorder_release(hw, tid_agg_rx);
740 spin_unlock(&tid_agg_rx->reorder_lock);
745 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
746 * true if the MPDU was buffered, false if it should be processed.
748 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
750 struct sk_buff *skb = rx->skb;
751 struct ieee80211_local *local = rx->local;
752 struct ieee80211_hw *hw = &local->hw;
753 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
754 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
755 struct sta_info *sta = rx->sta;
756 struct tid_ampdu_rx *tid_agg_rx;
760 if (!ieee80211_is_data_qos(hdr->frame_control))
764 * filter the QoS data rx stream according to
765 * STA/TID and check if this STA/TID is on aggregation
771 ack_policy = *ieee80211_get_qos_ctl(hdr) &
772 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
773 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
775 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
779 /* qos null data frames are excluded */
780 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
783 /* not part of a BA session */
784 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
785 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
788 /* not actually part of this BA session */
789 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
792 /* new, potentially un-ordered, ampdu frame - process it */
794 /* reset session timer */
795 if (tid_agg_rx->timeout)
796 mod_timer(&tid_agg_rx->session_timer,
797 TU_TO_EXP_TIME(tid_agg_rx->timeout));
799 /* if this mpdu is fragmented - terminate rx aggregation session */
800 sc = le16_to_cpu(hdr->seq_ctrl);
801 if (sc & IEEE80211_SCTL_FRAG) {
802 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
803 skb_queue_tail(&rx->sdata->skb_queue, skb);
804 ieee80211_queue_work(&local->hw, &rx->sdata->work);
809 * No locking needed -- we will only ever process one
810 * RX packet at a time, and thus own tid_agg_rx. All
811 * other code manipulating it needs to (and does) make
812 * sure that we cannot get to it any more before doing
815 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
819 skb_queue_tail(&local->rx_skb_queue, skb);
822 static ieee80211_rx_result debug_noinline
823 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
826 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
828 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
829 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
830 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
831 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
833 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
834 rx->local->dot11FrameDuplicateCount++;
835 rx->sta->num_duplicates++;
837 return RX_DROP_UNUSABLE;
839 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
842 if (unlikely(rx->skb->len < 16)) {
843 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
844 return RX_DROP_MONITOR;
847 /* Drop disallowed frame classes based on STA auth/assoc state;
848 * IEEE 802.11, Chap 5.5.
850 * mac80211 filters only based on association state, i.e. it drops
851 * Class 3 frames from not associated stations. hostapd sends
852 * deauth/disassoc frames when needed. In addition, hostapd is
853 * responsible for filtering on both auth and assoc states.
856 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
857 return ieee80211_rx_mesh_check(rx);
859 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
860 ieee80211_is_pspoll(hdr->frame_control)) &&
861 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
862 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
863 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
865 * accept port control frames from the AP even when it's not
866 * yet marked ASSOC to prevent a race where we don't set the
867 * assoc bit quickly enough before it sends the first frame
869 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
870 ieee80211_is_data_present(hdr->frame_control)) {
874 payload = rx->skb->data +
875 ieee80211_hdrlen(hdr->frame_control);
876 ethertype = (payload[6] << 8) | payload[7];
877 if (cpu_to_be16(ethertype) ==
878 rx->sdata->control_port_protocol)
882 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
883 cfg80211_rx_spurious_frame(rx->sdata->dev,
886 return RX_DROP_UNUSABLE;
888 return RX_DROP_MONITOR;
895 static ieee80211_rx_result debug_noinline
896 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
898 struct sk_buff *skb = rx->skb;
899 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
900 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
903 ieee80211_rx_result result = RX_DROP_UNUSABLE;
904 struct ieee80211_key *sta_ptk = NULL;
905 int mmie_keyidx = -1;
911 * There are four types of keys:
913 * - IGTK (group keys for management frames)
914 * - PTK (pairwise keys)
915 * - STK (station-to-station pairwise keys)
917 * When selecting a key, we have to distinguish between multicast
918 * (including broadcast) and unicast frames, the latter can only
919 * use PTKs and STKs while the former always use GTKs and IGTKs.
920 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
921 * unicast frames can also use key indices like GTKs. Hence, if we
922 * don't have a PTK/STK we check the key index for a WEP key.
924 * Note that in a regular BSS, multicast frames are sent by the
925 * AP only, associated stations unicast the frame to the AP first
926 * which then multicasts it on their behalf.
928 * There is also a slight problem in IBSS mode: GTKs are negotiated
929 * with each station, that is something we don't currently handle.
930 * The spec seems to expect that one negotiates the same key with
931 * every station but there's no such requirement; VLANs could be
936 * No point in finding a key and decrypting if the frame is neither
937 * addressed to us nor a multicast frame.
939 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
942 /* start without a key */
946 sta_ptk = rcu_dereference(rx->sta->ptk);
948 fc = hdr->frame_control;
950 if (!ieee80211_has_protected(fc))
951 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
953 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
955 if ((status->flag & RX_FLAG_DECRYPTED) &&
956 (status->flag & RX_FLAG_IV_STRIPPED))
958 /* Skip decryption if the frame is not protected. */
959 if (!ieee80211_has_protected(fc))
961 } else if (mmie_keyidx >= 0) {
962 /* Broadcast/multicast robust management frame / BIP */
963 if ((status->flag & RX_FLAG_DECRYPTED) &&
964 (status->flag & RX_FLAG_IV_STRIPPED))
967 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
968 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
969 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
971 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
973 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
974 } else if (!ieee80211_has_protected(fc)) {
976 * The frame was not protected, so skip decryption. However, we
977 * need to set rx->key if there is a key that could have been
978 * used so that the frame may be dropped if encryption would
979 * have been expected.
981 struct ieee80211_key *key = NULL;
982 struct ieee80211_sub_if_data *sdata = rx->sdata;
985 if (ieee80211_is_mgmt(fc) &&
986 is_multicast_ether_addr(hdr->addr1) &&
987 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
991 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
992 key = rcu_dereference(rx->sta->gtk[i]);
998 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
999 key = rcu_dereference(sdata->keys[i]);
1011 * The device doesn't give us the IV so we won't be
1012 * able to look up the key. That's ok though, we
1013 * don't need to decrypt the frame, we just won't
1014 * be able to keep statistics accurate.
1015 * Except for key threshold notifications, should
1016 * we somehow allow the driver to tell us which key
1017 * the hardware used if this flag is set?
1019 if ((status->flag & RX_FLAG_DECRYPTED) &&
1020 (status->flag & RX_FLAG_IV_STRIPPED))
1023 hdrlen = ieee80211_hdrlen(fc);
1025 if (rx->skb->len < 8 + hdrlen)
1026 return RX_DROP_UNUSABLE; /* TODO: count this? */
1029 * no need to call ieee80211_wep_get_keyidx,
1030 * it verifies a bunch of things we've done already
1032 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1033 keyidx = keyid >> 6;
1035 /* check per-station GTK first, if multicast packet */
1036 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1037 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1039 /* if not found, try default key */
1041 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1044 * RSNA-protected unicast frames should always be
1045 * sent with pairwise or station-to-station keys,
1046 * but for WEP we allow using a key index as well.
1049 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1050 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1051 !is_multicast_ether_addr(hdr->addr1))
1057 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1058 return RX_DROP_MONITOR;
1060 rx->key->tx_rx_count++;
1061 /* TODO: add threshold stuff again */
1063 return RX_DROP_MONITOR;
1066 switch (rx->key->conf.cipher) {
1067 case WLAN_CIPHER_SUITE_WEP40:
1068 case WLAN_CIPHER_SUITE_WEP104:
1069 result = ieee80211_crypto_wep_decrypt(rx);
1071 case WLAN_CIPHER_SUITE_TKIP:
1072 result = ieee80211_crypto_tkip_decrypt(rx);
1074 case WLAN_CIPHER_SUITE_CCMP:
1075 result = ieee80211_crypto_ccmp_decrypt(rx);
1077 case WLAN_CIPHER_SUITE_AES_CMAC:
1078 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1082 * We can reach here only with HW-only algorithms
1083 * but why didn't it decrypt the frame?!
1085 return RX_DROP_UNUSABLE;
1088 /* the hdr variable is invalid after the decrypt handlers */
1090 /* either the frame has been decrypted or will be dropped */
1091 status->flag |= RX_FLAG_DECRYPTED;
1096 static ieee80211_rx_result debug_noinline
1097 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1099 struct ieee80211_local *local;
1100 struct ieee80211_hdr *hdr;
1101 struct sk_buff *skb;
1105 hdr = (struct ieee80211_hdr *) skb->data;
1107 if (!local->pspolling)
1110 if (!ieee80211_has_fromds(hdr->frame_control))
1111 /* this is not from AP */
1114 if (!ieee80211_is_data(hdr->frame_control))
1117 if (!ieee80211_has_moredata(hdr->frame_control)) {
1118 /* AP has no more frames buffered for us */
1119 local->pspolling = false;
1123 /* more data bit is set, let's request a new frame from the AP */
1124 ieee80211_send_pspoll(local, rx->sdata);
1129 static void ap_sta_ps_start(struct sta_info *sta)
1131 struct ieee80211_sub_if_data *sdata = sta->sdata;
1132 struct ieee80211_local *local = sdata->local;
1134 atomic_inc(&sdata->bss->num_sta_ps);
1135 set_sta_flag(sta, WLAN_STA_PS_STA);
1136 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1137 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1138 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1139 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1140 sdata->name, sta->sta.addr, sta->sta.aid);
1141 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1144 static void ap_sta_ps_end(struct sta_info *sta)
1146 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1147 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1148 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1149 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1151 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1152 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1153 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1154 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1155 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1159 ieee80211_sta_ps_deliver_wakeup(sta);
1162 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1164 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1167 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1169 /* Don't let the same PS state be set twice */
1170 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1171 if ((start && in_ps) || (!start && !in_ps))
1175 ap_sta_ps_start(sta_inf);
1177 ap_sta_ps_end(sta_inf);
1181 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1183 static ieee80211_rx_result debug_noinline
1184 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1186 struct ieee80211_sub_if_data *sdata = rx->sdata;
1187 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1188 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1191 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1194 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1195 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1199 * The device handles station powersave, so don't do anything about
1200 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1201 * it to mac80211 since they're handled.)
1203 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1207 * Don't do anything if the station isn't already asleep. In
1208 * the uAPSD case, the station will probably be marked asleep,
1209 * in the PS-Poll case the station must be confused ...
1211 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1214 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1215 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1216 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1217 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1219 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1222 /* Free PS Poll skb here instead of returning RX_DROP that would
1223 * count as an dropped frame. */
1224 dev_kfree_skb(rx->skb);
1227 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1228 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1229 ieee80211_has_pm(hdr->frame_control) &&
1230 (ieee80211_is_data_qos(hdr->frame_control) ||
1231 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1232 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1233 ac = ieee802_1d_to_ac[tid & 7];
1236 * If this AC is not trigger-enabled do nothing.
1238 * NB: This could/should check a separate bitmap of trigger-
1239 * enabled queues, but for now we only implement uAPSD w/o
1240 * TSPEC changes to the ACs, so they're always the same.
1242 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1245 /* if we are in a service period, do nothing */
1246 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1249 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1250 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1252 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1258 static ieee80211_rx_result debug_noinline
1259 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1261 struct sta_info *sta = rx->sta;
1262 struct sk_buff *skb = rx->skb;
1263 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1264 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1270 * Update last_rx only for IBSS packets which are for the current
1271 * BSSID to avoid keeping the current IBSS network alive in cases
1272 * where other STAs start using different BSSID.
1274 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1275 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1276 NL80211_IFTYPE_ADHOC);
1277 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
1278 sta->last_rx = jiffies;
1279 if (ieee80211_is_data(hdr->frame_control)) {
1280 sta->last_rx_rate_idx = status->rate_idx;
1281 sta->last_rx_rate_flag = status->flag;
1284 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1286 * Mesh beacons will update last_rx when if they are found to
1287 * match the current local configuration when processed.
1289 sta->last_rx = jiffies;
1290 if (ieee80211_is_data(hdr->frame_control)) {
1291 sta->last_rx_rate_idx = status->rate_idx;
1292 sta->last_rx_rate_flag = status->flag;
1296 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1299 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1300 ieee80211_sta_rx_notify(rx->sdata, hdr);
1302 sta->rx_fragments++;
1303 sta->rx_bytes += rx->skb->len;
1304 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1305 sta->last_signal = status->signal;
1306 ewma_add(&sta->avg_signal, -status->signal);
1310 * Change STA power saving mode only at the end of a frame
1311 * exchange sequence.
1313 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1314 !ieee80211_has_morefrags(hdr->frame_control) &&
1315 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1316 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1317 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1318 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1320 * Ignore doze->wake transitions that are
1321 * indicated by non-data frames, the standard
1322 * is unclear here, but for example going to
1323 * PS mode and then scanning would cause a
1324 * doze->wake transition for the probe request,
1325 * and that is clearly undesirable.
1327 if (ieee80211_is_data(hdr->frame_control) &&
1328 !ieee80211_has_pm(hdr->frame_control))
1331 if (ieee80211_has_pm(hdr->frame_control))
1332 ap_sta_ps_start(sta);
1337 * Drop (qos-)data::nullfunc frames silently, since they
1338 * are used only to control station power saving mode.
1340 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1341 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1342 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1345 * If we receive a 4-addr nullfunc frame from a STA
1346 * that was not moved to a 4-addr STA vlan yet send
1347 * the event to userspace and for older hostapd drop
1348 * the frame to the monitor interface.
1350 if (ieee80211_has_a4(hdr->frame_control) &&
1351 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1353 !rx->sdata->u.vlan.sta))) {
1354 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1355 cfg80211_rx_unexpected_4addr_frame(
1356 rx->sdata->dev, sta->sta.addr,
1358 return RX_DROP_MONITOR;
1361 * Update counter and free packet here to avoid
1362 * counting this as a dropped packed.
1365 dev_kfree_skb(rx->skb);
1370 } /* ieee80211_rx_h_sta_process */
1372 static inline struct ieee80211_fragment_entry *
1373 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1374 unsigned int frag, unsigned int seq, int rx_queue,
1375 struct sk_buff **skb)
1377 struct ieee80211_fragment_entry *entry;
1380 idx = sdata->fragment_next;
1381 entry = &sdata->fragments[sdata->fragment_next++];
1382 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1383 sdata->fragment_next = 0;
1385 if (!skb_queue_empty(&entry->skb_list)) {
1386 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1387 struct ieee80211_hdr *hdr =
1388 (struct ieee80211_hdr *) entry->skb_list.next->data;
1389 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1390 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1391 "addr1=%pM addr2=%pM\n",
1393 jiffies - entry->first_frag_time, entry->seq,
1394 entry->last_frag, hdr->addr1, hdr->addr2);
1396 __skb_queue_purge(&entry->skb_list);
1399 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1401 entry->first_frag_time = jiffies;
1403 entry->rx_queue = rx_queue;
1404 entry->last_frag = frag;
1406 entry->extra_len = 0;
1411 static inline struct ieee80211_fragment_entry *
1412 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1413 unsigned int frag, unsigned int seq,
1414 int rx_queue, struct ieee80211_hdr *hdr)
1416 struct ieee80211_fragment_entry *entry;
1419 idx = sdata->fragment_next;
1420 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1421 struct ieee80211_hdr *f_hdr;
1425 idx = IEEE80211_FRAGMENT_MAX - 1;
1427 entry = &sdata->fragments[idx];
1428 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1429 entry->rx_queue != rx_queue ||
1430 entry->last_frag + 1 != frag)
1433 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1436 * Check ftype and addresses are equal, else check next fragment
1438 if (((hdr->frame_control ^ f_hdr->frame_control) &
1439 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1440 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1441 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1444 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1445 __skb_queue_purge(&entry->skb_list);
1454 static ieee80211_rx_result debug_noinline
1455 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1457 struct ieee80211_hdr *hdr;
1460 unsigned int frag, seq;
1461 struct ieee80211_fragment_entry *entry;
1462 struct sk_buff *skb;
1463 struct ieee80211_rx_status *status;
1465 hdr = (struct ieee80211_hdr *)rx->skb->data;
1466 fc = hdr->frame_control;
1467 sc = le16_to_cpu(hdr->seq_ctrl);
1468 frag = sc & IEEE80211_SCTL_FRAG;
1470 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1471 (rx->skb)->len < 24 ||
1472 is_multicast_ether_addr(hdr->addr1))) {
1473 /* not fragmented */
1476 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1478 if (skb_linearize(rx->skb))
1479 return RX_DROP_UNUSABLE;
1482 * skb_linearize() might change the skb->data and
1483 * previously cached variables (in this case, hdr) need to
1484 * be refreshed with the new data.
1486 hdr = (struct ieee80211_hdr *)rx->skb->data;
1487 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1490 /* This is the first fragment of a new frame. */
1491 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1492 rx->seqno_idx, &(rx->skb));
1493 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1494 ieee80211_has_protected(fc)) {
1495 int queue = rx->security_idx;
1496 /* Store CCMP PN so that we can verify that the next
1497 * fragment has a sequential PN value. */
1499 memcpy(entry->last_pn,
1500 rx->key->u.ccmp.rx_pn[queue],
1506 /* This is a fragment for a frame that should already be pending in
1507 * fragment cache. Add this fragment to the end of the pending entry.
1509 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1510 rx->seqno_idx, hdr);
1512 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1513 return RX_DROP_MONITOR;
1516 /* Verify that MPDUs within one MSDU have sequential PN values.
1517 * (IEEE 802.11i, 8.3.3.4.5) */
1520 u8 pn[CCMP_PN_LEN], *rpn;
1522 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1523 return RX_DROP_UNUSABLE;
1524 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1525 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1530 queue = rx->security_idx;
1531 rpn = rx->key->u.ccmp.rx_pn[queue];
1532 if (memcmp(pn, rpn, CCMP_PN_LEN))
1533 return RX_DROP_UNUSABLE;
1534 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1537 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1538 __skb_queue_tail(&entry->skb_list, rx->skb);
1539 entry->last_frag = frag;
1540 entry->extra_len += rx->skb->len;
1541 if (ieee80211_has_morefrags(fc)) {
1546 rx->skb = __skb_dequeue(&entry->skb_list);
1547 if (skb_tailroom(rx->skb) < entry->extra_len) {
1548 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1549 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1551 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1552 __skb_queue_purge(&entry->skb_list);
1553 return RX_DROP_UNUSABLE;
1556 while ((skb = __skb_dequeue(&entry->skb_list))) {
1557 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1561 /* Complete frame has been reassembled - process it now */
1562 status = IEEE80211_SKB_RXCB(rx->skb);
1563 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1567 rx->sta->rx_packets++;
1568 if (is_multicast_ether_addr(hdr->addr1))
1569 rx->local->dot11MulticastReceivedFrameCount++;
1571 ieee80211_led_rx(rx->local);
1576 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1578 if (unlikely(!rx->sta ||
1579 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1586 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1588 struct sk_buff *skb = rx->skb;
1589 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1592 * Pass through unencrypted frames if the hardware has
1593 * decrypted them already.
1595 if (status->flag & RX_FLAG_DECRYPTED)
1598 /* Drop unencrypted frames if key is set. */
1599 if (unlikely(!ieee80211_has_protected(fc) &&
1600 !ieee80211_is_nullfunc(fc) &&
1601 ieee80211_is_data(fc) &&
1602 (rx->key || rx->sdata->drop_unencrypted)))
1609 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1612 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1613 __le16 fc = hdr->frame_control;
1616 * Pass through unencrypted frames if the hardware has
1617 * decrypted them already.
1619 if (status->flag & RX_FLAG_DECRYPTED)
1622 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1623 if (unlikely(!ieee80211_has_protected(fc) &&
1624 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1626 if (ieee80211_is_deauth(fc))
1627 cfg80211_send_unprot_deauth(rx->sdata->dev,
1630 else if (ieee80211_is_disassoc(fc))
1631 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1636 /* BIP does not use Protected field, so need to check MMIE */
1637 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1638 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1639 if (ieee80211_is_deauth(fc))
1640 cfg80211_send_unprot_deauth(rx->sdata->dev,
1643 else if (ieee80211_is_disassoc(fc))
1644 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1650 * When using MFP, Action frames are not allowed prior to
1651 * having configured keys.
1653 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1654 ieee80211_is_robust_mgmt_frame(
1655 (struct ieee80211_hdr *) rx->skb->data)))
1663 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1665 struct ieee80211_sub_if_data *sdata = rx->sdata;
1666 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1667 bool check_port_control = false;
1668 struct ethhdr *ehdr;
1671 *port_control = false;
1672 if (ieee80211_has_a4(hdr->frame_control) &&
1673 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1676 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1677 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1679 if (!sdata->u.mgd.use_4addr)
1682 check_port_control = true;
1685 if (is_multicast_ether_addr(hdr->addr1) &&
1686 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1689 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1693 ehdr = (struct ethhdr *) rx->skb->data;
1694 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1695 *port_control = true;
1696 else if (check_port_control)
1703 * requires that rx->skb is a frame with ethernet header
1705 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1707 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1708 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1709 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1712 * Allow EAPOL frames to us/the PAE group address regardless
1713 * of whether the frame was encrypted or not.
1715 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1716 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1717 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1720 if (ieee80211_802_1x_port_control(rx) ||
1721 ieee80211_drop_unencrypted(rx, fc))
1728 * requires that rx->skb is a frame with ethernet header
1731 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1733 struct ieee80211_sub_if_data *sdata = rx->sdata;
1734 struct net_device *dev = sdata->dev;
1735 struct sk_buff *skb, *xmit_skb;
1736 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1737 struct sta_info *dsta;
1738 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1743 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1744 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1745 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1746 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1747 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1748 if (is_multicast_ether_addr(ehdr->h_dest)) {
1750 * send multicast frames both to higher layers in
1751 * local net stack and back to the wireless medium
1753 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1754 if (!xmit_skb && net_ratelimit())
1755 printk(KERN_DEBUG "%s: failed to clone "
1756 "multicast frame\n", dev->name);
1758 dsta = sta_info_get(sdata, skb->data);
1761 * The destination station is associated to
1762 * this AP (in this VLAN), so send the frame
1763 * directly to it and do not pass it to local
1773 int align __maybe_unused;
1775 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1777 * 'align' will only take the values 0 or 2 here
1778 * since all frames are required to be aligned
1779 * to 2-byte boundaries when being passed to
1780 * mac80211. That also explains the __skb_push()
1783 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1785 if (WARN_ON(skb_headroom(skb) < 3)) {
1789 u8 *data = skb->data;
1790 size_t len = skb_headlen(skb);
1792 memmove(skb->data, data, len);
1793 skb_set_tail_pointer(skb, len);
1799 /* deliver to local stack */
1800 skb->protocol = eth_type_trans(skb, dev);
1801 memset(skb->cb, 0, sizeof(skb->cb));
1802 netif_receive_skb(skb);
1808 * Send to wireless media and increase priority by 256 to
1809 * keep the received priority instead of reclassifying
1810 * the frame (see cfg80211_classify8021d).
1812 xmit_skb->priority += 256;
1813 xmit_skb->protocol = htons(ETH_P_802_3);
1814 skb_reset_network_header(xmit_skb);
1815 skb_reset_mac_header(xmit_skb);
1816 dev_queue_xmit(xmit_skb);
1820 static ieee80211_rx_result debug_noinline
1821 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1823 struct net_device *dev = rx->sdata->dev;
1824 struct sk_buff *skb = rx->skb;
1825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1826 __le16 fc = hdr->frame_control;
1827 struct sk_buff_head frame_list;
1828 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1830 if (unlikely(!ieee80211_is_data(fc)))
1833 if (unlikely(!ieee80211_is_data_present(fc)))
1834 return RX_DROP_MONITOR;
1836 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1839 if (ieee80211_has_a4(hdr->frame_control) &&
1840 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1841 !rx->sdata->u.vlan.sta)
1842 return RX_DROP_UNUSABLE;
1844 if (is_multicast_ether_addr(hdr->addr1) &&
1845 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1846 rx->sdata->u.vlan.sta) ||
1847 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1848 rx->sdata->u.mgd.use_4addr)))
1849 return RX_DROP_UNUSABLE;
1852 __skb_queue_head_init(&frame_list);
1854 if (skb_linearize(skb))
1855 return RX_DROP_UNUSABLE;
1857 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1858 rx->sdata->vif.type,
1859 rx->local->hw.extra_tx_headroom, true);
1861 while (!skb_queue_empty(&frame_list)) {
1862 rx->skb = __skb_dequeue(&frame_list);
1864 if (!ieee80211_frame_allowed(rx, fc)) {
1865 dev_kfree_skb(rx->skb);
1868 dev->stats.rx_packets++;
1869 dev->stats.rx_bytes += rx->skb->len;
1871 ieee80211_deliver_skb(rx);
1877 #ifdef CONFIG_MAC80211_MESH
1878 static ieee80211_rx_result
1879 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1881 struct ieee80211_hdr *fwd_hdr, *hdr;
1882 struct ieee80211_tx_info *info;
1883 struct ieee80211s_hdr *mesh_hdr;
1884 struct sk_buff *skb = rx->skb, *fwd_skb;
1885 struct ieee80211_local *local = rx->local;
1886 struct ieee80211_sub_if_data *sdata = rx->sdata;
1887 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1888 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1889 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1892 hdr = (struct ieee80211_hdr *) skb->data;
1893 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1894 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1896 /* frame is in RMC, don't forward */
1897 if (ieee80211_is_data(hdr->frame_control) &&
1898 is_multicast_ether_addr(hdr->addr1) &&
1899 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1900 return RX_DROP_MONITOR;
1902 if (!ieee80211_is_data(hdr->frame_control))
1906 return RX_DROP_MONITOR;
1908 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1909 struct mesh_path *mppath;
1913 if (is_multicast_ether_addr(hdr->addr1)) {
1914 mpp_addr = hdr->addr3;
1915 proxied_addr = mesh_hdr->eaddr1;
1917 mpp_addr = hdr->addr4;
1918 proxied_addr = mesh_hdr->eaddr2;
1922 mppath = mpp_path_lookup(proxied_addr, sdata);
1924 mpp_path_add(proxied_addr, mpp_addr, sdata);
1926 spin_lock_bh(&mppath->state_lock);
1927 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1928 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1929 spin_unlock_bh(&mppath->state_lock);
1934 /* Frame has reached destination. Don't forward */
1935 if (!is_multicast_ether_addr(hdr->addr1) &&
1936 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1939 q = ieee80211_select_queue_80211(local, skb, hdr);
1940 if (ieee80211_queue_stopped(&local->hw, q)) {
1941 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
1942 return RX_DROP_MONITOR;
1944 skb_set_queue_mapping(skb, q);
1946 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1949 if (!--mesh_hdr->ttl) {
1950 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1951 return RX_DROP_MONITOR;
1954 if (!ifmsh->mshcfg.dot11MeshForwarding)
1957 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1959 if (net_ratelimit())
1960 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1965 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1966 info = IEEE80211_SKB_CB(fwd_skb);
1967 memset(info, 0, sizeof(*info));
1968 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1969 info->control.vif = &rx->sdata->vif;
1970 info->control.jiffies = jiffies;
1971 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1972 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1973 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1974 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1975 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1977 /* unable to resolve next hop */
1978 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1979 0, reason, fwd_hdr->addr2, sdata);
1980 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
1982 return RX_DROP_MONITOR;
1985 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1986 ieee80211_add_pending_skb(local, fwd_skb);
1988 if (is_multicast_ether_addr(hdr->addr1) ||
1989 sdata->dev->flags & IFF_PROMISC)
1992 return RX_DROP_MONITOR;
1996 static ieee80211_rx_result debug_noinline
1997 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1999 struct ieee80211_sub_if_data *sdata = rx->sdata;
2000 struct ieee80211_local *local = rx->local;
2001 struct net_device *dev = sdata->dev;
2002 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2003 __le16 fc = hdr->frame_control;
2007 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2010 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2011 return RX_DROP_MONITOR;
2014 * Send unexpected-4addr-frame event to hostapd. For older versions,
2015 * also drop the frame to cooked monitor interfaces.
2017 if (ieee80211_has_a4(hdr->frame_control) &&
2018 sdata->vif.type == NL80211_IFTYPE_AP) {
2020 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2021 cfg80211_rx_unexpected_4addr_frame(
2022 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2023 return RX_DROP_MONITOR;
2026 err = __ieee80211_data_to_8023(rx, &port_control);
2028 return RX_DROP_UNUSABLE;
2030 if (!ieee80211_frame_allowed(rx, fc))
2031 return RX_DROP_MONITOR;
2033 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2034 unlikely(port_control) && sdata->bss) {
2035 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2043 dev->stats.rx_packets++;
2044 dev->stats.rx_bytes += rx->skb->len;
2046 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2047 !is_multicast_ether_addr(
2048 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2049 (!local->scanning &&
2050 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2051 mod_timer(&local->dynamic_ps_timer, jiffies +
2052 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2055 ieee80211_deliver_skb(rx);
2060 static ieee80211_rx_result debug_noinline
2061 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2063 struct ieee80211_local *local = rx->local;
2064 struct ieee80211_hw *hw = &local->hw;
2065 struct sk_buff *skb = rx->skb;
2066 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2067 struct tid_ampdu_rx *tid_agg_rx;
2071 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2074 if (ieee80211_is_back_req(bar->frame_control)) {
2076 __le16 control, start_seq_num;
2077 } __packed bar_data;
2080 return RX_DROP_MONITOR;
2082 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2083 &bar_data, sizeof(bar_data)))
2084 return RX_DROP_MONITOR;
2086 tid = le16_to_cpu(bar_data.control) >> 12;
2088 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2090 return RX_DROP_MONITOR;
2092 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2094 /* reset session timer */
2095 if (tid_agg_rx->timeout)
2096 mod_timer(&tid_agg_rx->session_timer,
2097 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2099 spin_lock(&tid_agg_rx->reorder_lock);
2100 /* release stored frames up to start of BAR */
2101 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2102 spin_unlock(&tid_agg_rx->reorder_lock);
2109 * After this point, we only want management frames,
2110 * so we can drop all remaining control frames to
2111 * cooked monitor interfaces.
2113 return RX_DROP_MONITOR;
2116 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2117 struct ieee80211_mgmt *mgmt,
2120 struct ieee80211_local *local = sdata->local;
2121 struct sk_buff *skb;
2122 struct ieee80211_mgmt *resp;
2124 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2125 /* Not to own unicast address */
2129 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2130 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2131 /* Not from the current AP or not associated yet. */
2135 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2136 /* Too short SA Query request frame */
2140 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2144 skb_reserve(skb, local->hw.extra_tx_headroom);
2145 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2146 memset(resp, 0, 24);
2147 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2148 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2149 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2150 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2151 IEEE80211_STYPE_ACTION);
2152 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2153 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2154 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2155 memcpy(resp->u.action.u.sa_query.trans_id,
2156 mgmt->u.action.u.sa_query.trans_id,
2157 WLAN_SA_QUERY_TR_ID_LEN);
2159 ieee80211_tx_skb(sdata, skb);
2162 static ieee80211_rx_result debug_noinline
2163 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2165 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2166 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2169 * From here on, look only at management frames.
2170 * Data and control frames are already handled,
2171 * and unknown (reserved) frames are useless.
2173 if (rx->skb->len < 24)
2174 return RX_DROP_MONITOR;
2176 if (!ieee80211_is_mgmt(mgmt->frame_control))
2177 return RX_DROP_MONITOR;
2179 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2180 ieee80211_is_beacon(mgmt->frame_control) &&
2181 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2184 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2185 sig = status->signal;
2187 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2188 rx->skb->data, rx->skb->len,
2189 status->freq, sig, GFP_ATOMIC);
2190 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2193 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2194 return RX_DROP_MONITOR;
2196 if (ieee80211_drop_unencrypted_mgmt(rx))
2197 return RX_DROP_UNUSABLE;
2202 static ieee80211_rx_result debug_noinline
2203 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2205 struct ieee80211_local *local = rx->local;
2206 struct ieee80211_sub_if_data *sdata = rx->sdata;
2207 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2208 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2209 int len = rx->skb->len;
2211 if (!ieee80211_is_action(mgmt->frame_control))
2214 /* drop too small frames */
2215 if (len < IEEE80211_MIN_ACTION_SIZE)
2216 return RX_DROP_UNUSABLE;
2218 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2219 return RX_DROP_UNUSABLE;
2221 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2222 return RX_DROP_UNUSABLE;
2224 switch (mgmt->u.action.category) {
2225 case WLAN_CATEGORY_HT:
2226 /* reject HT action frames from stations not supporting HT */
2227 if (!rx->sta->sta.ht_cap.ht_supported)
2230 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2231 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2232 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2233 sdata->vif.type != NL80211_IFTYPE_AP &&
2234 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2237 /* verify action & smps_control are present */
2238 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2241 switch (mgmt->u.action.u.ht_smps.action) {
2242 case WLAN_HT_ACTION_SMPS: {
2243 struct ieee80211_supported_band *sband;
2246 /* convert to HT capability */
2247 switch (mgmt->u.action.u.ht_smps.smps_control) {
2248 case WLAN_HT_SMPS_CONTROL_DISABLED:
2249 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2251 case WLAN_HT_SMPS_CONTROL_STATIC:
2252 smps = WLAN_HT_CAP_SM_PS_STATIC;
2254 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2255 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2260 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2262 /* if no change do nothing */
2263 if ((rx->sta->sta.ht_cap.cap &
2264 IEEE80211_HT_CAP_SM_PS) == smps)
2267 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2268 rx->sta->sta.ht_cap.cap |= smps;
2270 sband = rx->local->hw.wiphy->bands[status->band];
2272 rate_control_rate_update(
2273 local, sband, rx->sta,
2274 IEEE80211_RC_SMPS_CHANGED,
2275 ieee80211_get_tx_channel_type(
2276 local, local->_oper_channel_type));
2284 case WLAN_CATEGORY_BACK:
2285 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2286 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2287 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2288 sdata->vif.type != NL80211_IFTYPE_AP &&
2289 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2292 /* verify action_code is present */
2293 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2296 switch (mgmt->u.action.u.addba_req.action_code) {
2297 case WLAN_ACTION_ADDBA_REQ:
2298 if (len < (IEEE80211_MIN_ACTION_SIZE +
2299 sizeof(mgmt->u.action.u.addba_req)))
2302 case WLAN_ACTION_ADDBA_RESP:
2303 if (len < (IEEE80211_MIN_ACTION_SIZE +
2304 sizeof(mgmt->u.action.u.addba_resp)))
2307 case WLAN_ACTION_DELBA:
2308 if (len < (IEEE80211_MIN_ACTION_SIZE +
2309 sizeof(mgmt->u.action.u.delba)))
2317 case WLAN_CATEGORY_SPECTRUM_MGMT:
2318 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2321 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2324 /* verify action_code is present */
2325 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2328 switch (mgmt->u.action.u.measurement.action_code) {
2329 case WLAN_ACTION_SPCT_MSR_REQ:
2330 if (len < (IEEE80211_MIN_ACTION_SIZE +
2331 sizeof(mgmt->u.action.u.measurement)))
2333 ieee80211_process_measurement_req(sdata, mgmt, len);
2335 case WLAN_ACTION_SPCT_CHL_SWITCH:
2336 if (len < (IEEE80211_MIN_ACTION_SIZE +
2337 sizeof(mgmt->u.action.u.chan_switch)))
2340 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2343 if (compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid))
2349 case WLAN_CATEGORY_SA_QUERY:
2350 if (len < (IEEE80211_MIN_ACTION_SIZE +
2351 sizeof(mgmt->u.action.u.sa_query)))
2354 switch (mgmt->u.action.u.sa_query.action) {
2355 case WLAN_ACTION_SA_QUERY_REQUEST:
2356 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2358 ieee80211_process_sa_query_req(sdata, mgmt, len);
2362 case WLAN_CATEGORY_SELF_PROTECTED:
2363 switch (mgmt->u.action.u.self_prot.action_code) {
2364 case WLAN_SP_MESH_PEERING_OPEN:
2365 case WLAN_SP_MESH_PEERING_CLOSE:
2366 case WLAN_SP_MESH_PEERING_CONFIRM:
2367 if (!ieee80211_vif_is_mesh(&sdata->vif))
2369 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2370 /* userspace handles this frame */
2373 case WLAN_SP_MGK_INFORM:
2374 case WLAN_SP_MGK_ACK:
2375 if (!ieee80211_vif_is_mesh(&sdata->vif))
2380 case WLAN_CATEGORY_MESH_ACTION:
2381 if (!ieee80211_vif_is_mesh(&sdata->vif))
2383 if (mesh_action_is_path_sel(mgmt) &&
2384 (!mesh_path_sel_is_hwmp(sdata)))
2392 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2393 /* will return in the next handlers */
2398 rx->sta->rx_packets++;
2399 dev_kfree_skb(rx->skb);
2403 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2404 skb_queue_tail(&sdata->skb_queue, rx->skb);
2405 ieee80211_queue_work(&local->hw, &sdata->work);
2407 rx->sta->rx_packets++;
2411 static ieee80211_rx_result debug_noinline
2412 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2414 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2417 /* skip known-bad action frames and return them in the next handler */
2418 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2422 * Getting here means the kernel doesn't know how to handle
2423 * it, but maybe userspace does ... include returned frames
2424 * so userspace can register for those to know whether ones
2425 * it transmitted were processed or returned.
2428 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2429 sig = status->signal;
2431 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, sig,
2432 rx->skb->data, rx->skb->len,
2435 rx->sta->rx_packets++;
2436 dev_kfree_skb(rx->skb);
2444 static ieee80211_rx_result debug_noinline
2445 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2447 struct ieee80211_local *local = rx->local;
2448 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2449 struct sk_buff *nskb;
2450 struct ieee80211_sub_if_data *sdata = rx->sdata;
2451 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2453 if (!ieee80211_is_action(mgmt->frame_control))
2457 * For AP mode, hostapd is responsible for handling any action
2458 * frames that we didn't handle, including returning unknown
2459 * ones. For all other modes we will return them to the sender,
2460 * setting the 0x80 bit in the action category, as required by
2461 * 802.11-2007 7.3.1.11.
2462 * Newer versions of hostapd shall also use the management frame
2463 * registration mechanisms, but older ones still use cooked
2464 * monitor interfaces so push all frames there.
2466 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2467 (sdata->vif.type == NL80211_IFTYPE_AP ||
2468 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2469 return RX_DROP_MONITOR;
2471 /* do not return rejected action frames */
2472 if (mgmt->u.action.category & 0x80)
2473 return RX_DROP_UNUSABLE;
2475 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2478 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2480 nmgmt->u.action.category |= 0x80;
2481 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2482 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2484 memset(nskb->cb, 0, sizeof(nskb->cb));
2486 ieee80211_tx_skb(rx->sdata, nskb);
2488 dev_kfree_skb(rx->skb);
2492 static ieee80211_rx_result debug_noinline
2493 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2495 struct ieee80211_sub_if_data *sdata = rx->sdata;
2496 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2499 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2501 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2502 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2503 sdata->vif.type != NL80211_IFTYPE_STATION)
2504 return RX_DROP_MONITOR;
2507 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2508 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2509 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2510 /* process for all: mesh, mlme, ibss */
2512 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2513 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2514 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2515 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2516 if (is_multicast_ether_addr(mgmt->da) &&
2517 !is_broadcast_ether_addr(mgmt->da))
2518 return RX_DROP_MONITOR;
2520 /* process only for station */
2521 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2522 return RX_DROP_MONITOR;
2524 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2525 /* process only for ibss */
2526 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2527 return RX_DROP_MONITOR;
2530 return RX_DROP_MONITOR;
2533 /* queue up frame and kick off work to process it */
2534 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2535 skb_queue_tail(&sdata->skb_queue, rx->skb);
2536 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2538 rx->sta->rx_packets++;
2543 /* TODO: use IEEE80211_RX_FRAGMENTED */
2544 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2545 struct ieee80211_rate *rate)
2547 struct ieee80211_sub_if_data *sdata;
2548 struct ieee80211_local *local = rx->local;
2549 struct sk_buff *skb = rx->skb, *skb2;
2550 struct net_device *prev_dev = NULL;
2551 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2552 int needed_headroom;
2555 * If cooked monitor has been processed already, then
2556 * don't do it again. If not, set the flag.
2558 if (rx->flags & IEEE80211_RX_CMNTR)
2560 rx->flags |= IEEE80211_RX_CMNTR;
2562 /* If there are no cooked monitor interfaces, just free the SKB */
2563 if (!local->cooked_mntrs)
2566 /* room for the radiotap header based on driver features */
2567 needed_headroom = ieee80211_rx_radiotap_len(local, status);
2569 if (skb_headroom(skb) < needed_headroom &&
2570 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2573 /* prepend radiotap information */
2574 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
2576 skb_set_mac_header(skb, 0);
2577 skb->ip_summed = CHECKSUM_UNNECESSARY;
2578 skb->pkt_type = PACKET_OTHERHOST;
2579 skb->protocol = htons(ETH_P_802_2);
2581 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2582 if (!ieee80211_sdata_running(sdata))
2585 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2586 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2590 skb2 = skb_clone(skb, GFP_ATOMIC);
2592 skb2->dev = prev_dev;
2593 netif_receive_skb(skb2);
2597 prev_dev = sdata->dev;
2598 sdata->dev->stats.rx_packets++;
2599 sdata->dev->stats.rx_bytes += skb->len;
2603 skb->dev = prev_dev;
2604 netif_receive_skb(skb);
2612 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2613 ieee80211_rx_result res)
2616 case RX_DROP_MONITOR:
2617 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2619 rx->sta->rx_dropped++;
2622 struct ieee80211_rate *rate = NULL;
2623 struct ieee80211_supported_band *sband;
2624 struct ieee80211_rx_status *status;
2626 status = IEEE80211_SKB_RXCB((rx->skb));
2628 sband = rx->local->hw.wiphy->bands[status->band];
2629 if (!(status->flag & RX_FLAG_HT))
2630 rate = &sband->bitrates[status->rate_idx];
2632 ieee80211_rx_cooked_monitor(rx, rate);
2635 case RX_DROP_UNUSABLE:
2636 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2638 rx->sta->rx_dropped++;
2639 dev_kfree_skb(rx->skb);
2642 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2647 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2649 ieee80211_rx_result res = RX_DROP_MONITOR;
2650 struct sk_buff *skb;
2652 #define CALL_RXH(rxh) \
2655 if (res != RX_CONTINUE) \
2659 spin_lock(&rx->local->rx_skb_queue.lock);
2660 if (rx->local->running_rx_handler)
2663 rx->local->running_rx_handler = true;
2665 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2666 spin_unlock(&rx->local->rx_skb_queue.lock);
2669 * all the other fields are valid across frames
2670 * that belong to an aMPDU since they are on the
2671 * same TID from the same station
2675 CALL_RXH(ieee80211_rx_h_decrypt)
2676 CALL_RXH(ieee80211_rx_h_check_more_data)
2677 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2678 CALL_RXH(ieee80211_rx_h_sta_process)
2679 CALL_RXH(ieee80211_rx_h_defragment)
2680 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2681 /* must be after MMIC verify so header is counted in MPDU mic */
2682 #ifdef CONFIG_MAC80211_MESH
2683 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2684 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2686 CALL_RXH(ieee80211_rx_h_amsdu)
2687 CALL_RXH(ieee80211_rx_h_data)
2688 CALL_RXH(ieee80211_rx_h_ctrl);
2689 CALL_RXH(ieee80211_rx_h_mgmt_check)
2690 CALL_RXH(ieee80211_rx_h_action)
2691 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2692 CALL_RXH(ieee80211_rx_h_action_return)
2693 CALL_RXH(ieee80211_rx_h_mgmt)
2696 ieee80211_rx_handlers_result(rx, res);
2697 spin_lock(&rx->local->rx_skb_queue.lock);
2701 rx->local->running_rx_handler = false;
2704 spin_unlock(&rx->local->rx_skb_queue.lock);
2707 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2709 ieee80211_rx_result res = RX_DROP_MONITOR;
2711 #define CALL_RXH(rxh) \
2714 if (res != RX_CONTINUE) \
2718 CALL_RXH(ieee80211_rx_h_passive_scan)
2719 CALL_RXH(ieee80211_rx_h_check)
2721 ieee80211_rx_reorder_ampdu(rx);
2723 ieee80211_rx_handlers(rx);
2727 ieee80211_rx_handlers_result(rx, res);
2733 * This function makes calls into the RX path, therefore
2734 * it has to be invoked under RCU read lock.
2736 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2738 struct ieee80211_rx_data rx = {
2740 .sdata = sta->sdata,
2741 .local = sta->local,
2742 /* This is OK -- must be QoS data frame */
2743 .security_idx = tid,
2747 struct tid_ampdu_rx *tid_agg_rx;
2749 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2753 spin_lock(&tid_agg_rx->reorder_lock);
2754 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2755 spin_unlock(&tid_agg_rx->reorder_lock);
2757 ieee80211_rx_handlers(&rx);
2760 /* main receive path */
2762 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2763 struct ieee80211_hdr *hdr)
2765 struct ieee80211_sub_if_data *sdata = rx->sdata;
2766 struct sk_buff *skb = rx->skb;
2767 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2768 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2769 int multicast = is_multicast_ether_addr(hdr->addr1);
2771 switch (sdata->vif.type) {
2772 case NL80211_IFTYPE_STATION:
2773 if (!bssid && !sdata->u.mgd.use_4addr)
2776 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2777 if (!(sdata->dev->flags & IFF_PROMISC) ||
2778 sdata->u.mgd.use_4addr)
2780 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2783 case NL80211_IFTYPE_ADHOC:
2786 if (ieee80211_is_beacon(hdr->frame_control)) {
2789 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2790 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2792 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2793 } else if (!multicast &&
2794 compare_ether_addr(sdata->vif.addr,
2796 if (!(sdata->dev->flags & IFF_PROMISC))
2798 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2799 } else if (!rx->sta) {
2801 if (status->flag & RX_FLAG_HT)
2802 rate_idx = 0; /* TODO: HT rates */
2804 rate_idx = status->rate_idx;
2805 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2809 case NL80211_IFTYPE_MESH_POINT:
2811 compare_ether_addr(sdata->vif.addr,
2813 if (!(sdata->dev->flags & IFF_PROMISC))
2816 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2819 case NL80211_IFTYPE_AP_VLAN:
2820 case NL80211_IFTYPE_AP:
2822 if (compare_ether_addr(sdata->vif.addr,
2825 } else if (!ieee80211_bssid_match(bssid,
2828 * Accept public action frames even when the
2829 * BSSID doesn't match, this is used for P2P
2830 * and location updates. Note that mac80211
2831 * itself never looks at these frames.
2833 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2834 ieee80211_is_public_action(hdr, skb->len))
2836 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2837 !ieee80211_is_beacon(hdr->frame_control))
2839 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2842 case NL80211_IFTYPE_WDS:
2843 if (bssid || !ieee80211_is_data(hdr->frame_control))
2845 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2849 /* should never get here */
2858 * This function returns whether or not the SKB
2859 * was destined for RX processing or not, which,
2860 * if consume is true, is equivalent to whether
2861 * or not the skb was consumed.
2863 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2864 struct sk_buff *skb, bool consume)
2866 struct ieee80211_local *local = rx->local;
2867 struct ieee80211_sub_if_data *sdata = rx->sdata;
2868 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2869 struct ieee80211_hdr *hdr = (void *)skb->data;
2873 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2874 prepares = prepare_for_handlers(rx, hdr);
2880 skb = skb_copy(skb, GFP_ATOMIC);
2882 if (net_ratelimit())
2883 wiphy_debug(local->hw.wiphy,
2884 "failed to copy skb for %s\n",
2892 ieee80211_invoke_rx_handlers(rx);
2897 * This is the actual Rx frames handler. as it blongs to Rx path it must
2898 * be called with rcu_read_lock protection.
2900 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2901 struct sk_buff *skb)
2903 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2904 struct ieee80211_local *local = hw_to_local(hw);
2905 struct ieee80211_sub_if_data *sdata;
2906 struct ieee80211_hdr *hdr;
2908 struct ieee80211_rx_data rx;
2909 struct ieee80211_sub_if_data *prev;
2910 struct sta_info *sta, *tmp, *prev_sta;
2913 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2914 memset(&rx, 0, sizeof(rx));
2918 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2919 local->dot11ReceivedFragmentCount++;
2921 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2922 test_bit(SCAN_SW_SCANNING, &local->scanning)))
2923 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2925 if (ieee80211_is_mgmt(fc))
2926 err = skb_linearize(skb);
2928 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2935 hdr = (struct ieee80211_hdr *)skb->data;
2936 ieee80211_parse_qos(&rx);
2937 ieee80211_verify_alignment(&rx);
2939 if (ieee80211_is_data(fc)) {
2942 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2949 rx.sdata = prev_sta->sdata;
2950 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2957 rx.sdata = prev_sta->sdata;
2959 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2967 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2968 if (!ieee80211_sdata_running(sdata))
2971 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2972 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2976 * frame is destined for this interface, but if it's
2977 * not also for the previous one we handle that after
2978 * the loop to avoid copying the SKB once too much
2986 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2988 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2994 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2997 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3006 * This is the receive path handler. It is called by a low level driver when an
3007 * 802.11 MPDU is received from the hardware.
3009 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3011 struct ieee80211_local *local = hw_to_local(hw);
3012 struct ieee80211_rate *rate = NULL;
3013 struct ieee80211_supported_band *sband;
3014 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3016 WARN_ON_ONCE(softirq_count() == 0);
3018 if (WARN_ON(status->band < 0 ||
3019 status->band >= IEEE80211_NUM_BANDS))
3022 sband = local->hw.wiphy->bands[status->band];
3023 if (WARN_ON(!sband))
3027 * If we're suspending, it is possible although not too likely
3028 * that we'd be receiving frames after having already partially
3029 * quiesced the stack. We can't process such frames then since
3030 * that might, for example, cause stations to be added or other
3031 * driver callbacks be invoked.
3033 if (unlikely(local->quiescing || local->suspended))
3037 * The same happens when we're not even started,
3038 * but that's worth a warning.
3040 if (WARN_ON(!local->started))
3043 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3045 * Validate the rate, unless a PLCP error means that
3046 * we probably can't have a valid rate here anyway.
3049 if (status->flag & RX_FLAG_HT) {
3051 * rate_idx is MCS index, which can be [0-76]
3054 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3056 * Anything else would be some sort of driver or
3057 * hardware error. The driver should catch hardware
3060 if (WARN((status->rate_idx < 0 ||
3061 status->rate_idx > 76),
3062 "Rate marked as an HT rate but passed "
3063 "status->rate_idx is not "
3064 "an MCS index [0-76]: %d (0x%02x)\n",
3069 if (WARN_ON(status->rate_idx < 0 ||
3070 status->rate_idx >= sband->n_bitrates))
3072 rate = &sband->bitrates[status->rate_idx];
3076 status->rx_flags = 0;
3079 * key references and virtual interfaces are protected using RCU
3080 * and this requires that we are in a read-side RCU section during
3081 * receive processing
3086 * Frames with failed FCS/PLCP checksum are not returned,
3087 * all other frames are returned without radiotap header
3088 * if it was previously present.
3089 * Also, frames with less than 16 bytes are dropped.
3091 skb = ieee80211_rx_monitor(local, skb, rate);
3097 ieee80211_tpt_led_trig_rx(local,
3098 ((struct ieee80211_hdr *)skb->data)->frame_control,
3100 __ieee80211_rx_handle_packet(hw, skb);
3108 EXPORT_SYMBOL(ieee80211_rx);
3110 /* This is a version of the rx handler that can be called from hard irq
3111 * context. Post the skb on the queue and schedule the tasklet */
3112 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3114 struct ieee80211_local *local = hw_to_local(hw);
3116 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3118 skb->pkt_type = IEEE80211_RX_MSG;
3119 skb_queue_tail(&local->skb_queue, skb);
3120 tasklet_schedule(&local->tasklet);
3122 EXPORT_SYMBOL(ieee80211_rx_irqsafe);