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,
106 int rtap_len, bool has_fcs)
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 (has_fcs && (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++ = local->hw.radiotap_mcs_details;
209 if (status->flag & RX_FLAG_SHORT_GI)
210 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
211 if (status->flag & RX_FLAG_40MHZ)
212 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
213 if (status->flag & RX_FLAG_HT_GF)
214 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
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,
300 skb_reset_mac_header(skb);
301 skb->ip_summed = CHECKSUM_UNNECESSARY;
302 skb->pkt_type = PACKET_OTHERHOST;
303 skb->protocol = htons(ETH_P_802_2);
305 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
306 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
309 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
312 if (!ieee80211_sdata_running(sdata))
316 skb2 = skb_clone(skb, GFP_ATOMIC);
318 skb2->dev = prev_dev;
319 netif_receive_skb(skb2);
323 prev_dev = sdata->dev;
324 sdata->dev->stats.rx_packets++;
325 sdata->dev->stats.rx_bytes += skb->len;
330 netif_receive_skb(skb);
338 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
340 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
341 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
342 int tid, seqno_idx, security_idx;
344 /* does the frame have a qos control field? */
345 if (ieee80211_is_data_qos(hdr->frame_control)) {
346 u8 *qc = ieee80211_get_qos_ctl(hdr);
347 /* frame has qos control */
348 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
349 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
350 status->rx_flags |= IEEE80211_RX_AMSDU;
356 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
358 * Sequence numbers for management frames, QoS data
359 * frames with a broadcast/multicast address in the
360 * Address 1 field, and all non-QoS data frames sent
361 * by QoS STAs are assigned using an additional single
362 * modulo-4096 counter, [...]
364 * We also use that counter for non-QoS STAs.
366 seqno_idx = NUM_RX_DATA_QUEUES;
368 if (ieee80211_is_mgmt(hdr->frame_control))
369 security_idx = NUM_RX_DATA_QUEUES;
373 rx->seqno_idx = seqno_idx;
374 rx->security_idx = security_idx;
375 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
376 * For now, set skb->priority to 0 for other cases. */
377 rx->skb->priority = (tid > 7) ? 0 : tid;
381 * DOC: Packet alignment
383 * Drivers always need to pass packets that are aligned to two-byte boundaries
386 * Additionally, should, if possible, align the payload data in a way that
387 * guarantees that the contained IP header is aligned to a four-byte
388 * boundary. In the case of regular frames, this simply means aligning the
389 * payload to a four-byte boundary (because either the IP header is directly
390 * contained, or IV/RFC1042 headers that have a length divisible by four are
391 * in front of it). If the payload data is not properly aligned and the
392 * architecture doesn't support efficient unaligned operations, mac80211
393 * will align the data.
395 * With A-MSDU frames, however, the payload data address must yield two modulo
396 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
397 * push the IP header further back to a multiple of four again. Thankfully, the
398 * specs were sane enough this time around to require padding each A-MSDU
399 * subframe to a length that is a multiple of four.
401 * Padding like Atheros hardware adds which is between the 802.11 header and
402 * the payload is not supported, the driver is required to move the 802.11
403 * header to be directly in front of the payload in that case.
405 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
407 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
408 WARN_ONCE((unsigned long)rx->skb->data & 1,
409 "unaligned packet at 0x%p\n", rx->skb->data);
416 static ieee80211_rx_result debug_noinline
417 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
419 struct ieee80211_local *local = rx->local;
420 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
421 struct sk_buff *skb = rx->skb;
423 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
424 !local->sched_scanning))
427 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
428 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
429 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
430 local->sched_scanning)
431 return ieee80211_scan_rx(rx->sdata, skb);
433 /* scanning finished during invoking of handlers */
434 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
435 return RX_DROP_UNUSABLE;
439 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
441 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
443 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
446 return ieee80211_is_robust_mgmt_frame(hdr);
450 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
452 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
454 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
457 return ieee80211_is_robust_mgmt_frame(hdr);
461 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
462 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
464 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
465 struct ieee80211_mmie *mmie;
467 if (skb->len < 24 + sizeof(*mmie) ||
468 !is_multicast_ether_addr(hdr->da))
471 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
472 return -1; /* not a robust management frame */
474 mmie = (struct ieee80211_mmie *)
475 (skb->data + skb->len - sizeof(*mmie));
476 if (mmie->element_id != WLAN_EID_MMIE ||
477 mmie->length != sizeof(*mmie) - 2)
480 return le16_to_cpu(mmie->key_id);
484 static ieee80211_rx_result
485 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
487 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
488 char *dev_addr = rx->sdata->vif.addr;
490 if (ieee80211_is_data(hdr->frame_control)) {
491 if (is_multicast_ether_addr(hdr->addr1)) {
492 if (ieee80211_has_tods(hdr->frame_control) ||
493 !ieee80211_has_fromds(hdr->frame_control))
494 return RX_DROP_MONITOR;
495 if (ether_addr_equal(hdr->addr3, dev_addr))
496 return RX_DROP_MONITOR;
498 if (!ieee80211_has_a4(hdr->frame_control))
499 return RX_DROP_MONITOR;
500 if (ether_addr_equal(hdr->addr4, dev_addr))
501 return RX_DROP_MONITOR;
505 /* If there is not an established peer link and this is not a peer link
506 * establisment frame, beacon or probe, drop the frame.
509 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
510 struct ieee80211_mgmt *mgmt;
512 if (!ieee80211_is_mgmt(hdr->frame_control))
513 return RX_DROP_MONITOR;
515 if (ieee80211_is_action(hdr->frame_control)) {
517 mgmt = (struct ieee80211_mgmt *)hdr;
518 category = mgmt->u.action.category;
519 if (category != WLAN_CATEGORY_MESH_ACTION &&
520 category != WLAN_CATEGORY_SELF_PROTECTED)
521 return RX_DROP_MONITOR;
525 if (ieee80211_is_probe_req(hdr->frame_control) ||
526 ieee80211_is_probe_resp(hdr->frame_control) ||
527 ieee80211_is_beacon(hdr->frame_control) ||
528 ieee80211_is_auth(hdr->frame_control))
531 return RX_DROP_MONITOR;
538 #define SEQ_MODULO 0x1000
539 #define SEQ_MASK 0xfff
541 static inline int seq_less(u16 sq1, u16 sq2)
543 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
546 static inline u16 seq_inc(u16 sq)
548 return (sq + 1) & SEQ_MASK;
551 static inline u16 seq_sub(u16 sq1, u16 sq2)
553 return (sq1 - sq2) & SEQ_MASK;
557 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
558 struct tid_ampdu_rx *tid_agg_rx,
561 struct ieee80211_local *local = hw_to_local(hw);
562 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
563 struct ieee80211_rx_status *status;
565 lockdep_assert_held(&tid_agg_rx->reorder_lock);
570 /* release the frame from the reorder ring buffer */
571 tid_agg_rx->stored_mpdu_num--;
572 tid_agg_rx->reorder_buf[index] = NULL;
573 status = IEEE80211_SKB_RXCB(skb);
574 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
575 skb_queue_tail(&local->rx_skb_queue, skb);
578 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
581 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
582 struct tid_ampdu_rx *tid_agg_rx,
587 lockdep_assert_held(&tid_agg_rx->reorder_lock);
589 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
590 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
591 tid_agg_rx->buf_size;
592 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
597 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
598 * the skb was added to the buffer longer than this time ago, the earlier
599 * frames that have not yet been received are assumed to be lost and the skb
600 * can be released for processing. This may also release other skb's from the
601 * reorder buffer if there are no additional gaps between the frames.
603 * Callers must hold tid_agg_rx->reorder_lock.
605 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
607 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
608 struct tid_ampdu_rx *tid_agg_rx)
612 lockdep_assert_held(&tid_agg_rx->reorder_lock);
614 /* release the buffer until next missing frame */
615 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
616 tid_agg_rx->buf_size;
617 if (!tid_agg_rx->reorder_buf[index] &&
618 tid_agg_rx->stored_mpdu_num) {
620 * No buffers ready to be released, but check whether any
621 * frames in the reorder buffer have timed out.
624 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
625 j = (j + 1) % tid_agg_rx->buf_size) {
626 if (!tid_agg_rx->reorder_buf[j]) {
631 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
632 HT_RX_REORDER_BUF_TIMEOUT))
633 goto set_release_timer;
635 #ifdef CONFIG_MAC80211_HT_DEBUG
637 wiphy_debug(hw->wiphy,
638 "release an RX reorder frame due to timeout on earlier frames\n");
640 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
643 * Increment the head seq# also for the skipped slots.
645 tid_agg_rx->head_seq_num =
646 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
649 } else while (tid_agg_rx->reorder_buf[index]) {
650 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
651 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
652 tid_agg_rx->buf_size;
655 if (tid_agg_rx->stored_mpdu_num) {
656 j = index = seq_sub(tid_agg_rx->head_seq_num,
657 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
659 for (; j != (index - 1) % tid_agg_rx->buf_size;
660 j = (j + 1) % tid_agg_rx->buf_size) {
661 if (tid_agg_rx->reorder_buf[j])
667 mod_timer(&tid_agg_rx->reorder_timer,
668 tid_agg_rx->reorder_time[j] + 1 +
669 HT_RX_REORDER_BUF_TIMEOUT);
671 del_timer(&tid_agg_rx->reorder_timer);
676 * As this function belongs to the RX path it must be under
677 * rcu_read_lock protection. It returns false if the frame
678 * can be processed immediately, true if it was consumed.
680 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
681 struct tid_ampdu_rx *tid_agg_rx,
684 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
685 u16 sc = le16_to_cpu(hdr->seq_ctrl);
686 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
687 u16 head_seq_num, buf_size;
691 spin_lock(&tid_agg_rx->reorder_lock);
693 buf_size = tid_agg_rx->buf_size;
694 head_seq_num = tid_agg_rx->head_seq_num;
696 /* frame with out of date sequence number */
697 if (seq_less(mpdu_seq_num, head_seq_num)) {
703 * If frame the sequence number exceeds our buffering window
704 * size release some previous frames to make room for this one.
706 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
707 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
708 /* release stored frames up to new head to stack */
709 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
712 /* Now the new frame is always in the range of the reordering buffer */
714 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
716 /* check if we already stored this frame */
717 if (tid_agg_rx->reorder_buf[index]) {
723 * If the current MPDU is in the right order and nothing else
724 * is stored we can process it directly, no need to buffer it.
725 * If it is first but there's something stored, we may be able
726 * to release frames after this one.
728 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
729 tid_agg_rx->stored_mpdu_num == 0) {
730 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
735 /* put the frame in the reordering buffer */
736 tid_agg_rx->reorder_buf[index] = skb;
737 tid_agg_rx->reorder_time[index] = jiffies;
738 tid_agg_rx->stored_mpdu_num++;
739 ieee80211_sta_reorder_release(hw, tid_agg_rx);
742 spin_unlock(&tid_agg_rx->reorder_lock);
747 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
748 * true if the MPDU was buffered, false if it should be processed.
750 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
752 struct sk_buff *skb = rx->skb;
753 struct ieee80211_local *local = rx->local;
754 struct ieee80211_hw *hw = &local->hw;
755 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
756 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
757 struct sta_info *sta = rx->sta;
758 struct tid_ampdu_rx *tid_agg_rx;
762 if (!ieee80211_is_data_qos(hdr->frame_control))
766 * filter the QoS data rx stream according to
767 * STA/TID and check if this STA/TID is on aggregation
773 ack_policy = *ieee80211_get_qos_ctl(hdr) &
774 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
775 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
777 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
781 /* qos null data frames are excluded */
782 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
785 /* not part of a BA session */
786 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
787 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
790 /* not actually part of this BA session */
791 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
794 /* new, potentially un-ordered, ampdu frame - process it */
796 /* reset session timer */
797 if (tid_agg_rx->timeout)
798 tid_agg_rx->last_rx = jiffies;
800 /* if this mpdu is fragmented - terminate rx aggregation session */
801 sc = le16_to_cpu(hdr->seq_ctrl);
802 if (sc & IEEE80211_SCTL_FRAG) {
803 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
804 skb_queue_tail(&rx->sdata->skb_queue, skb);
805 ieee80211_queue_work(&local->hw, &rx->sdata->work);
810 * No locking needed -- we will only ever process one
811 * RX packet at a time, and thus own tid_agg_rx. All
812 * other code manipulating it needs to (and does) make
813 * sure that we cannot get to it any more before doing
816 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
820 skb_queue_tail(&local->rx_skb_queue, skb);
823 static ieee80211_rx_result debug_noinline
824 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
826 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
827 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
829 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
830 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
831 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
832 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
834 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
835 rx->local->dot11FrameDuplicateCount++;
836 rx->sta->num_duplicates++;
838 return RX_DROP_UNUSABLE;
840 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
843 if (unlikely(rx->skb->len < 16)) {
844 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
845 return RX_DROP_MONITOR;
848 /* Drop disallowed frame classes based on STA auth/assoc state;
849 * IEEE 802.11, Chap 5.5.
851 * mac80211 filters only based on association state, i.e. it drops
852 * Class 3 frames from not associated stations. hostapd sends
853 * deauth/disassoc frames when needed. In addition, hostapd is
854 * responsible for filtering on both auth and assoc states.
857 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
858 return ieee80211_rx_mesh_check(rx);
860 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
861 ieee80211_is_pspoll(hdr->frame_control)) &&
862 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
863 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
864 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
866 * accept port control frames from the AP even when it's not
867 * yet marked ASSOC to prevent a race where we don't set the
868 * assoc bit quickly enough before it sends the first frame
870 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
871 ieee80211_is_data_present(hdr->frame_control)) {
875 payload = rx->skb->data +
876 ieee80211_hdrlen(hdr->frame_control);
877 ethertype = (payload[6] << 8) | payload[7];
878 if (cpu_to_be16(ethertype) ==
879 rx->sdata->control_port_protocol)
883 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
884 cfg80211_rx_spurious_frame(rx->sdata->dev,
887 return RX_DROP_UNUSABLE;
889 return RX_DROP_MONITOR;
896 static ieee80211_rx_result debug_noinline
897 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
899 struct sk_buff *skb = rx->skb;
900 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
901 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
904 ieee80211_rx_result result = RX_DROP_UNUSABLE;
905 struct ieee80211_key *sta_ptk = NULL;
906 int mmie_keyidx = -1;
912 * There are four types of keys:
914 * - IGTK (group keys for management frames)
915 * - PTK (pairwise keys)
916 * - STK (station-to-station pairwise keys)
918 * When selecting a key, we have to distinguish between multicast
919 * (including broadcast) and unicast frames, the latter can only
920 * use PTKs and STKs while the former always use GTKs and IGTKs.
921 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
922 * unicast frames can also use key indices like GTKs. Hence, if we
923 * don't have a PTK/STK we check the key index for a WEP key.
925 * Note that in a regular BSS, multicast frames are sent by the
926 * AP only, associated stations unicast the frame to the AP first
927 * which then multicasts it on their behalf.
929 * There is also a slight problem in IBSS mode: GTKs are negotiated
930 * with each station, that is something we don't currently handle.
931 * The spec seems to expect that one negotiates the same key with
932 * every station but there's no such requirement; VLANs could be
937 * No point in finding a key and decrypting if the frame is neither
938 * addressed to us nor a multicast frame.
940 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
943 /* start without a key */
947 sta_ptk = rcu_dereference(rx->sta->ptk);
949 fc = hdr->frame_control;
951 if (!ieee80211_has_protected(fc))
952 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
954 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
956 if ((status->flag & RX_FLAG_DECRYPTED) &&
957 (status->flag & RX_FLAG_IV_STRIPPED))
959 /* Skip decryption if the frame is not protected. */
960 if (!ieee80211_has_protected(fc))
962 } else if (mmie_keyidx >= 0) {
963 /* Broadcast/multicast robust management frame / BIP */
964 if ((status->flag & RX_FLAG_DECRYPTED) &&
965 (status->flag & RX_FLAG_IV_STRIPPED))
968 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
969 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
970 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
972 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
974 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
975 } else if (!ieee80211_has_protected(fc)) {
977 * The frame was not protected, so skip decryption. However, we
978 * need to set rx->key if there is a key that could have been
979 * used so that the frame may be dropped if encryption would
980 * have been expected.
982 struct ieee80211_key *key = NULL;
983 struct ieee80211_sub_if_data *sdata = rx->sdata;
986 if (ieee80211_is_mgmt(fc) &&
987 is_multicast_ether_addr(hdr->addr1) &&
988 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
992 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
993 key = rcu_dereference(rx->sta->gtk[i]);
999 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1000 key = rcu_dereference(sdata->keys[i]);
1012 * The device doesn't give us the IV so we won't be
1013 * able to look up the key. That's ok though, we
1014 * don't need to decrypt the frame, we just won't
1015 * be able to keep statistics accurate.
1016 * Except for key threshold notifications, should
1017 * we somehow allow the driver to tell us which key
1018 * the hardware used if this flag is set?
1020 if ((status->flag & RX_FLAG_DECRYPTED) &&
1021 (status->flag & RX_FLAG_IV_STRIPPED))
1024 hdrlen = ieee80211_hdrlen(fc);
1026 if (rx->skb->len < 8 + hdrlen)
1027 return RX_DROP_UNUSABLE; /* TODO: count this? */
1030 * no need to call ieee80211_wep_get_keyidx,
1031 * it verifies a bunch of things we've done already
1033 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1034 keyidx = keyid >> 6;
1036 /* check per-station GTK first, if multicast packet */
1037 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1038 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1040 /* if not found, try default key */
1042 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1045 * RSNA-protected unicast frames should always be
1046 * sent with pairwise or station-to-station keys,
1047 * but for WEP we allow using a key index as well.
1050 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1051 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1052 !is_multicast_ether_addr(hdr->addr1))
1058 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1059 return RX_DROP_MONITOR;
1061 rx->key->tx_rx_count++;
1062 /* TODO: add threshold stuff again */
1064 return RX_DROP_MONITOR;
1067 switch (rx->key->conf.cipher) {
1068 case WLAN_CIPHER_SUITE_WEP40:
1069 case WLAN_CIPHER_SUITE_WEP104:
1070 result = ieee80211_crypto_wep_decrypt(rx);
1072 case WLAN_CIPHER_SUITE_TKIP:
1073 result = ieee80211_crypto_tkip_decrypt(rx);
1075 case WLAN_CIPHER_SUITE_CCMP:
1076 result = ieee80211_crypto_ccmp_decrypt(rx);
1078 case WLAN_CIPHER_SUITE_AES_CMAC:
1079 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1083 * We can reach here only with HW-only algorithms
1084 * but why didn't it decrypt the frame?!
1086 return RX_DROP_UNUSABLE;
1089 /* the hdr variable is invalid after the decrypt handlers */
1091 /* either the frame has been decrypted or will be dropped */
1092 status->flag |= RX_FLAG_DECRYPTED;
1097 static ieee80211_rx_result debug_noinline
1098 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1100 struct ieee80211_local *local;
1101 struct ieee80211_hdr *hdr;
1102 struct sk_buff *skb;
1106 hdr = (struct ieee80211_hdr *) skb->data;
1108 if (!local->pspolling)
1111 if (!ieee80211_has_fromds(hdr->frame_control))
1112 /* this is not from AP */
1115 if (!ieee80211_is_data(hdr->frame_control))
1118 if (!ieee80211_has_moredata(hdr->frame_control)) {
1119 /* AP has no more frames buffered for us */
1120 local->pspolling = false;
1124 /* more data bit is set, let's request a new frame from the AP */
1125 ieee80211_send_pspoll(local, rx->sdata);
1130 static void ap_sta_ps_start(struct sta_info *sta)
1132 struct ieee80211_sub_if_data *sdata = sta->sdata;
1133 struct ieee80211_local *local = sdata->local;
1135 atomic_inc(&sdata->bss->num_sta_ps);
1136 set_sta_flag(sta, WLAN_STA_PS_STA);
1137 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1138 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1139 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1140 pr_debug("%s: STA %pM aid %d enters power save mode\n",
1141 sdata->name, sta->sta.addr, sta->sta.aid);
1142 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1145 static void ap_sta_ps_end(struct sta_info *sta)
1147 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1148 pr_debug("%s: STA %pM aid %d exits power save mode\n",
1149 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1150 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1152 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1153 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1154 pr_debug("%s: STA %pM aid %d driver-ps-blocked\n",
1155 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1156 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1160 ieee80211_sta_ps_deliver_wakeup(sta);
1163 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1165 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1168 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1170 /* Don't let the same PS state be set twice */
1171 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1172 if ((start && in_ps) || (!start && !in_ps))
1176 ap_sta_ps_start(sta_inf);
1178 ap_sta_ps_end(sta_inf);
1182 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1184 static ieee80211_rx_result debug_noinline
1185 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1187 struct ieee80211_sub_if_data *sdata = rx->sdata;
1188 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1189 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1192 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1195 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1196 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1200 * The device handles station powersave, so don't do anything about
1201 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1202 * it to mac80211 since they're handled.)
1204 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1208 * Don't do anything if the station isn't already asleep. In
1209 * the uAPSD case, the station will probably be marked asleep,
1210 * in the PS-Poll case the station must be confused ...
1212 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1215 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1216 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1217 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1218 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1220 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1223 /* Free PS Poll skb here instead of returning RX_DROP that would
1224 * count as an dropped frame. */
1225 dev_kfree_skb(rx->skb);
1228 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1229 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1230 ieee80211_has_pm(hdr->frame_control) &&
1231 (ieee80211_is_data_qos(hdr->frame_control) ||
1232 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1233 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1234 ac = ieee802_1d_to_ac[tid & 7];
1237 * If this AC is not trigger-enabled do nothing.
1239 * NB: This could/should check a separate bitmap of trigger-
1240 * enabled queues, but for now we only implement uAPSD w/o
1241 * TSPEC changes to the ACs, so they're always the same.
1243 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1246 /* if we are in a service period, do nothing */
1247 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1250 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1251 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1253 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1259 static ieee80211_rx_result debug_noinline
1260 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1262 struct sta_info *sta = rx->sta;
1263 struct sk_buff *skb = rx->skb;
1264 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1265 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1271 * Update last_rx only for IBSS packets which are for the current
1272 * BSSID to avoid keeping the current IBSS network alive in cases
1273 * where other STAs start using different BSSID.
1275 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1276 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1277 NL80211_IFTYPE_ADHOC);
1278 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid)) {
1279 sta->last_rx = jiffies;
1280 if (ieee80211_is_data(hdr->frame_control)) {
1281 sta->last_rx_rate_idx = status->rate_idx;
1282 sta->last_rx_rate_flag = status->flag;
1285 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1287 * Mesh beacons will update last_rx when if they are found to
1288 * match the current local configuration when processed.
1290 sta->last_rx = jiffies;
1291 if (ieee80211_is_data(hdr->frame_control)) {
1292 sta->last_rx_rate_idx = status->rate_idx;
1293 sta->last_rx_rate_flag = status->flag;
1297 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1300 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1301 ieee80211_sta_rx_notify(rx->sdata, hdr);
1303 sta->rx_fragments++;
1304 sta->rx_bytes += rx->skb->len;
1305 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1306 sta->last_signal = status->signal;
1307 ewma_add(&sta->avg_signal, -status->signal);
1311 * Change STA power saving mode only at the end of a frame
1312 * exchange sequence.
1314 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1315 !ieee80211_has_morefrags(hdr->frame_control) &&
1316 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1317 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1318 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1319 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1321 * Ignore doze->wake transitions that are
1322 * indicated by non-data frames, the standard
1323 * is unclear here, but for example going to
1324 * PS mode and then scanning would cause a
1325 * doze->wake transition for the probe request,
1326 * and that is clearly undesirable.
1328 if (ieee80211_is_data(hdr->frame_control) &&
1329 !ieee80211_has_pm(hdr->frame_control))
1332 if (ieee80211_has_pm(hdr->frame_control))
1333 ap_sta_ps_start(sta);
1338 * Drop (qos-)data::nullfunc frames silently, since they
1339 * are used only to control station power saving mode.
1341 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1342 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1343 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1346 * If we receive a 4-addr nullfunc frame from a STA
1347 * that was not moved to a 4-addr STA vlan yet send
1348 * the event to userspace and for older hostapd drop
1349 * the frame to the monitor interface.
1351 if (ieee80211_has_a4(hdr->frame_control) &&
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1353 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1354 !rx->sdata->u.vlan.sta))) {
1355 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1356 cfg80211_rx_unexpected_4addr_frame(
1357 rx->sdata->dev, sta->sta.addr,
1359 return RX_DROP_MONITOR;
1362 * Update counter and free packet here to avoid
1363 * counting this as a dropped packed.
1366 dev_kfree_skb(rx->skb);
1371 } /* ieee80211_rx_h_sta_process */
1373 static inline struct ieee80211_fragment_entry *
1374 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1375 unsigned int frag, unsigned int seq, int rx_queue,
1376 struct sk_buff **skb)
1378 struct ieee80211_fragment_entry *entry;
1381 idx = sdata->fragment_next;
1382 entry = &sdata->fragments[sdata->fragment_next++];
1383 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1384 sdata->fragment_next = 0;
1386 if (!skb_queue_empty(&entry->skb_list)) {
1387 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1388 struct ieee80211_hdr *hdr =
1389 (struct ieee80211_hdr *) entry->skb_list.next->data;
1390 pr_debug("%s: RX reassembly removed oldest fragment entry (idx=%d age=%lu seq=%d last_frag=%d addr1=%pM addr2=%pM\n",
1392 jiffies - entry->first_frag_time, entry->seq,
1393 entry->last_frag, hdr->addr1, hdr->addr2);
1395 __skb_queue_purge(&entry->skb_list);
1398 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1400 entry->first_frag_time = jiffies;
1402 entry->rx_queue = rx_queue;
1403 entry->last_frag = frag;
1405 entry->extra_len = 0;
1410 static inline struct ieee80211_fragment_entry *
1411 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1412 unsigned int frag, unsigned int seq,
1413 int rx_queue, struct ieee80211_hdr *hdr)
1415 struct ieee80211_fragment_entry *entry;
1418 idx = sdata->fragment_next;
1419 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1420 struct ieee80211_hdr *f_hdr;
1424 idx = IEEE80211_FRAGMENT_MAX - 1;
1426 entry = &sdata->fragments[idx];
1427 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1428 entry->rx_queue != rx_queue ||
1429 entry->last_frag + 1 != frag)
1432 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1435 * Check ftype and addresses are equal, else check next fragment
1437 if (((hdr->frame_control ^ f_hdr->frame_control) &
1438 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1439 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1440 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1443 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1444 __skb_queue_purge(&entry->skb_list);
1453 static ieee80211_rx_result debug_noinline
1454 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1456 struct ieee80211_hdr *hdr;
1459 unsigned int frag, seq;
1460 struct ieee80211_fragment_entry *entry;
1461 struct sk_buff *skb;
1462 struct ieee80211_rx_status *status;
1464 hdr = (struct ieee80211_hdr *)rx->skb->data;
1465 fc = hdr->frame_control;
1466 sc = le16_to_cpu(hdr->seq_ctrl);
1467 frag = sc & IEEE80211_SCTL_FRAG;
1469 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1470 (rx->skb)->len < 24 ||
1471 is_multicast_ether_addr(hdr->addr1))) {
1472 /* not fragmented */
1475 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1477 if (skb_linearize(rx->skb))
1478 return RX_DROP_UNUSABLE;
1481 * skb_linearize() might change the skb->data and
1482 * previously cached variables (in this case, hdr) need to
1483 * be refreshed with the new data.
1485 hdr = (struct ieee80211_hdr *)rx->skb->data;
1486 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1489 /* This is the first fragment of a new frame. */
1490 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1491 rx->seqno_idx, &(rx->skb));
1492 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1493 ieee80211_has_protected(fc)) {
1494 int queue = rx->security_idx;
1495 /* Store CCMP PN so that we can verify that the next
1496 * fragment has a sequential PN value. */
1498 memcpy(entry->last_pn,
1499 rx->key->u.ccmp.rx_pn[queue],
1505 /* This is a fragment for a frame that should already be pending in
1506 * fragment cache. Add this fragment to the end of the pending entry.
1508 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1509 rx->seqno_idx, hdr);
1511 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1512 return RX_DROP_MONITOR;
1515 /* Verify that MPDUs within one MSDU have sequential PN values.
1516 * (IEEE 802.11i, 8.3.3.4.5) */
1519 u8 pn[CCMP_PN_LEN], *rpn;
1521 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1522 return RX_DROP_UNUSABLE;
1523 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1524 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1529 queue = rx->security_idx;
1530 rpn = rx->key->u.ccmp.rx_pn[queue];
1531 if (memcmp(pn, rpn, CCMP_PN_LEN))
1532 return RX_DROP_UNUSABLE;
1533 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1536 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1537 __skb_queue_tail(&entry->skb_list, rx->skb);
1538 entry->last_frag = frag;
1539 entry->extra_len += rx->skb->len;
1540 if (ieee80211_has_morefrags(fc)) {
1545 rx->skb = __skb_dequeue(&entry->skb_list);
1546 if (skb_tailroom(rx->skb) < entry->extra_len) {
1547 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1548 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1550 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1551 __skb_queue_purge(&entry->skb_list);
1552 return RX_DROP_UNUSABLE;
1555 while ((skb = __skb_dequeue(&entry->skb_list))) {
1556 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1560 /* Complete frame has been reassembled - process it now */
1561 status = IEEE80211_SKB_RXCB(rx->skb);
1562 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1566 rx->sta->rx_packets++;
1567 if (is_multicast_ether_addr(hdr->addr1))
1568 rx->local->dot11MulticastReceivedFrameCount++;
1570 ieee80211_led_rx(rx->local);
1575 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1577 if (unlikely(!rx->sta ||
1578 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1585 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1587 struct sk_buff *skb = rx->skb;
1588 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1591 * Pass through unencrypted frames if the hardware has
1592 * decrypted them already.
1594 if (status->flag & RX_FLAG_DECRYPTED)
1597 /* Drop unencrypted frames if key is set. */
1598 if (unlikely(!ieee80211_has_protected(fc) &&
1599 !ieee80211_is_nullfunc(fc) &&
1600 ieee80211_is_data(fc) &&
1601 (rx->key || rx->sdata->drop_unencrypted)))
1608 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1610 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1611 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1612 __le16 fc = hdr->frame_control;
1615 * Pass through unencrypted frames if the hardware has
1616 * decrypted them already.
1618 if (status->flag & RX_FLAG_DECRYPTED)
1621 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1622 if (unlikely(!ieee80211_has_protected(fc) &&
1623 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1625 if (ieee80211_is_deauth(fc))
1626 cfg80211_send_unprot_deauth(rx->sdata->dev,
1629 else if (ieee80211_is_disassoc(fc))
1630 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1635 /* BIP does not use Protected field, so need to check MMIE */
1636 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1637 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1638 if (ieee80211_is_deauth(fc))
1639 cfg80211_send_unprot_deauth(rx->sdata->dev,
1642 else if (ieee80211_is_disassoc(fc))
1643 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1649 * When using MFP, Action frames are not allowed prior to
1650 * having configured keys.
1652 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1653 ieee80211_is_robust_mgmt_frame(
1654 (struct ieee80211_hdr *) rx->skb->data)))
1662 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1664 struct ieee80211_sub_if_data *sdata = rx->sdata;
1665 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1666 bool check_port_control = false;
1667 struct ethhdr *ehdr;
1670 *port_control = false;
1671 if (ieee80211_has_a4(hdr->frame_control) &&
1672 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1675 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1676 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1678 if (!sdata->u.mgd.use_4addr)
1681 check_port_control = true;
1684 if (is_multicast_ether_addr(hdr->addr1) &&
1685 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1688 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1692 ehdr = (struct ethhdr *) rx->skb->data;
1693 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1694 *port_control = true;
1695 else if (check_port_control)
1702 * requires that rx->skb is a frame with ethernet header
1704 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1706 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1707 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1708 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1711 * Allow EAPOL frames to us/the PAE group address regardless
1712 * of whether the frame was encrypted or not.
1714 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1715 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1716 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1719 if (ieee80211_802_1x_port_control(rx) ||
1720 ieee80211_drop_unencrypted(rx, fc))
1727 * requires that rx->skb is a frame with ethernet header
1730 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1732 struct ieee80211_sub_if_data *sdata = rx->sdata;
1733 struct net_device *dev = sdata->dev;
1734 struct sk_buff *skb, *xmit_skb;
1735 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1736 struct sta_info *dsta;
1737 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1742 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1743 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1744 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1745 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1746 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1747 if (is_multicast_ether_addr(ehdr->h_dest)) {
1749 * send multicast frames both to higher layers in
1750 * local net stack and back to the wireless medium
1752 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1754 net_dbg_ratelimited("%s: failed to clone multicast frame\n",
1757 dsta = sta_info_get(sdata, skb->data);
1760 * The destination station is associated to
1761 * this AP (in this VLAN), so send the frame
1762 * directly to it and do not pass it to local
1772 int align __maybe_unused;
1774 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1776 * 'align' will only take the values 0 or 2 here
1777 * since all frames are required to be aligned
1778 * to 2-byte boundaries when being passed to
1779 * mac80211. That also explains the __skb_push()
1782 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1784 if (WARN_ON(skb_headroom(skb) < 3)) {
1788 u8 *data = skb->data;
1789 size_t len = skb_headlen(skb);
1791 memmove(skb->data, data, len);
1792 skb_set_tail_pointer(skb, len);
1798 /* deliver to local stack */
1799 skb->protocol = eth_type_trans(skb, dev);
1800 memset(skb->cb, 0, sizeof(skb->cb));
1801 netif_receive_skb(skb);
1807 * Send to wireless media and increase priority by 256 to
1808 * keep the received priority instead of reclassifying
1809 * the frame (see cfg80211_classify8021d).
1811 xmit_skb->priority += 256;
1812 xmit_skb->protocol = htons(ETH_P_802_3);
1813 skb_reset_network_header(xmit_skb);
1814 skb_reset_mac_header(xmit_skb);
1815 dev_queue_xmit(xmit_skb);
1819 static ieee80211_rx_result debug_noinline
1820 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1822 struct net_device *dev = rx->sdata->dev;
1823 struct sk_buff *skb = rx->skb;
1824 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1825 __le16 fc = hdr->frame_control;
1826 struct sk_buff_head frame_list;
1827 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1829 if (unlikely(!ieee80211_is_data(fc)))
1832 if (unlikely(!ieee80211_is_data_present(fc)))
1833 return RX_DROP_MONITOR;
1835 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1838 if (ieee80211_has_a4(hdr->frame_control) &&
1839 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1840 !rx->sdata->u.vlan.sta)
1841 return RX_DROP_UNUSABLE;
1843 if (is_multicast_ether_addr(hdr->addr1) &&
1844 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1845 rx->sdata->u.vlan.sta) ||
1846 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1847 rx->sdata->u.mgd.use_4addr)))
1848 return RX_DROP_UNUSABLE;
1851 __skb_queue_head_init(&frame_list);
1853 if (skb_linearize(skb))
1854 return RX_DROP_UNUSABLE;
1856 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1857 rx->sdata->vif.type,
1858 rx->local->hw.extra_tx_headroom, true);
1860 while (!skb_queue_empty(&frame_list)) {
1861 rx->skb = __skb_dequeue(&frame_list);
1863 if (!ieee80211_frame_allowed(rx, fc)) {
1864 dev_kfree_skb(rx->skb);
1867 dev->stats.rx_packets++;
1868 dev->stats.rx_bytes += rx->skb->len;
1870 ieee80211_deliver_skb(rx);
1876 #ifdef CONFIG_MAC80211_MESH
1877 static ieee80211_rx_result
1878 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1880 struct ieee80211_hdr *fwd_hdr, *hdr;
1881 struct ieee80211_tx_info *info;
1882 struct ieee80211s_hdr *mesh_hdr;
1883 struct sk_buff *skb = rx->skb, *fwd_skb;
1884 struct ieee80211_local *local = rx->local;
1885 struct ieee80211_sub_if_data *sdata = rx->sdata;
1886 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1887 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1888 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1891 hdr = (struct ieee80211_hdr *) skb->data;
1892 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1893 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1895 /* frame is in RMC, don't forward */
1896 if (ieee80211_is_data(hdr->frame_control) &&
1897 is_multicast_ether_addr(hdr->addr1) &&
1898 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1899 return RX_DROP_MONITOR;
1901 if (!ieee80211_is_data(hdr->frame_control))
1905 return RX_DROP_MONITOR;
1907 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1908 struct mesh_path *mppath;
1912 if (is_multicast_ether_addr(hdr->addr1)) {
1913 mpp_addr = hdr->addr3;
1914 proxied_addr = mesh_hdr->eaddr1;
1916 mpp_addr = hdr->addr4;
1917 proxied_addr = mesh_hdr->eaddr2;
1921 mppath = mpp_path_lookup(proxied_addr, sdata);
1923 mpp_path_add(proxied_addr, mpp_addr, sdata);
1925 spin_lock_bh(&mppath->state_lock);
1926 if (!ether_addr_equal(mppath->mpp, mpp_addr))
1927 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1928 spin_unlock_bh(&mppath->state_lock);
1933 /* Frame has reached destination. Don't forward */
1934 if (!is_multicast_ether_addr(hdr->addr1) &&
1935 ether_addr_equal(sdata->vif.addr, hdr->addr3))
1938 q = ieee80211_select_queue_80211(sdata, skb, hdr);
1939 if (ieee80211_queue_stopped(&local->hw, q)) {
1940 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
1941 return RX_DROP_MONITOR;
1943 skb_set_queue_mapping(skb, q);
1945 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1948 if (!--mesh_hdr->ttl) {
1949 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1950 return RX_DROP_MONITOR;
1953 if (!ifmsh->mshcfg.dot11MeshForwarding)
1956 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1958 net_dbg_ratelimited("%s: failed to clone mesh frame\n",
1963 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1964 info = IEEE80211_SKB_CB(fwd_skb);
1965 memset(info, 0, sizeof(*info));
1966 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1967 info->control.vif = &rx->sdata->vif;
1968 info->control.jiffies = jiffies;
1969 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1970 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1971 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1972 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1973 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1975 /* unable to resolve next hop */
1976 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1977 0, reason, fwd_hdr->addr2, sdata);
1978 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
1980 return RX_DROP_MONITOR;
1983 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1984 ieee80211_add_pending_skb(local, fwd_skb);
1986 if (is_multicast_ether_addr(hdr->addr1) ||
1987 sdata->dev->flags & IFF_PROMISC)
1990 return RX_DROP_MONITOR;
1994 static ieee80211_rx_result debug_noinline
1995 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1997 struct ieee80211_sub_if_data *sdata = rx->sdata;
1998 struct ieee80211_local *local = rx->local;
1999 struct net_device *dev = sdata->dev;
2000 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2001 __le16 fc = hdr->frame_control;
2005 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2008 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2009 return RX_DROP_MONITOR;
2012 * Send unexpected-4addr-frame event to hostapd. For older versions,
2013 * also drop the frame to cooked monitor interfaces.
2015 if (ieee80211_has_a4(hdr->frame_control) &&
2016 sdata->vif.type == NL80211_IFTYPE_AP) {
2018 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2019 cfg80211_rx_unexpected_4addr_frame(
2020 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2021 return RX_DROP_MONITOR;
2024 err = __ieee80211_data_to_8023(rx, &port_control);
2026 return RX_DROP_UNUSABLE;
2028 if (!ieee80211_frame_allowed(rx, fc))
2029 return RX_DROP_MONITOR;
2031 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2032 unlikely(port_control) && sdata->bss) {
2033 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2041 dev->stats.rx_packets++;
2042 dev->stats.rx_bytes += rx->skb->len;
2044 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2045 !is_multicast_ether_addr(
2046 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2047 (!local->scanning &&
2048 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2049 mod_timer(&local->dynamic_ps_timer, jiffies +
2050 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2053 ieee80211_deliver_skb(rx);
2058 static ieee80211_rx_result debug_noinline
2059 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2061 struct ieee80211_local *local = rx->local;
2062 struct ieee80211_hw *hw = &local->hw;
2063 struct sk_buff *skb = rx->skb;
2064 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2065 struct tid_ampdu_rx *tid_agg_rx;
2069 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2072 if (ieee80211_is_back_req(bar->frame_control)) {
2074 __le16 control, start_seq_num;
2075 } __packed bar_data;
2078 return RX_DROP_MONITOR;
2080 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2081 &bar_data, sizeof(bar_data)))
2082 return RX_DROP_MONITOR;
2084 tid = le16_to_cpu(bar_data.control) >> 12;
2086 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2088 return RX_DROP_MONITOR;
2090 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2092 /* reset session timer */
2093 if (tid_agg_rx->timeout)
2094 mod_timer(&tid_agg_rx->session_timer,
2095 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2097 spin_lock(&tid_agg_rx->reorder_lock);
2098 /* release stored frames up to start of BAR */
2099 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2100 spin_unlock(&tid_agg_rx->reorder_lock);
2107 * After this point, we only want management frames,
2108 * so we can drop all remaining control frames to
2109 * cooked monitor interfaces.
2111 return RX_DROP_MONITOR;
2114 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2115 struct ieee80211_mgmt *mgmt,
2118 struct ieee80211_local *local = sdata->local;
2119 struct sk_buff *skb;
2120 struct ieee80211_mgmt *resp;
2122 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2123 /* Not to own unicast address */
2127 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2128 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2129 /* Not from the current AP or not associated yet. */
2133 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2134 /* Too short SA Query request frame */
2138 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2142 skb_reserve(skb, local->hw.extra_tx_headroom);
2143 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2144 memset(resp, 0, 24);
2145 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2146 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2147 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2148 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2149 IEEE80211_STYPE_ACTION);
2150 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2151 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2152 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2153 memcpy(resp->u.action.u.sa_query.trans_id,
2154 mgmt->u.action.u.sa_query.trans_id,
2155 WLAN_SA_QUERY_TR_ID_LEN);
2157 ieee80211_tx_skb(sdata, skb);
2160 static ieee80211_rx_result debug_noinline
2161 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2163 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2164 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2167 * From here on, look only at management frames.
2168 * Data and control frames are already handled,
2169 * and unknown (reserved) frames are useless.
2171 if (rx->skb->len < 24)
2172 return RX_DROP_MONITOR;
2174 if (!ieee80211_is_mgmt(mgmt->frame_control))
2175 return RX_DROP_MONITOR;
2177 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2178 ieee80211_is_beacon(mgmt->frame_control) &&
2179 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2182 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2183 sig = status->signal;
2185 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2186 rx->skb->data, rx->skb->len,
2187 status->freq, sig, GFP_ATOMIC);
2188 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2191 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2192 return RX_DROP_MONITOR;
2194 if (ieee80211_drop_unencrypted_mgmt(rx))
2195 return RX_DROP_UNUSABLE;
2200 static ieee80211_rx_result debug_noinline
2201 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2203 struct ieee80211_local *local = rx->local;
2204 struct ieee80211_sub_if_data *sdata = rx->sdata;
2205 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2206 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2207 int len = rx->skb->len;
2209 if (!ieee80211_is_action(mgmt->frame_control))
2212 /* drop too small frames */
2213 if (len < IEEE80211_MIN_ACTION_SIZE)
2214 return RX_DROP_UNUSABLE;
2216 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2217 return RX_DROP_UNUSABLE;
2219 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2220 return RX_DROP_UNUSABLE;
2222 switch (mgmt->u.action.category) {
2223 case WLAN_CATEGORY_HT:
2224 /* reject HT action frames from stations not supporting HT */
2225 if (!rx->sta->sta.ht_cap.ht_supported)
2228 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2229 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2230 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2231 sdata->vif.type != NL80211_IFTYPE_AP &&
2232 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2235 /* verify action & smps_control are present */
2236 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2239 switch (mgmt->u.action.u.ht_smps.action) {
2240 case WLAN_HT_ACTION_SMPS: {
2241 struct ieee80211_supported_band *sband;
2244 /* convert to HT capability */
2245 switch (mgmt->u.action.u.ht_smps.smps_control) {
2246 case WLAN_HT_SMPS_CONTROL_DISABLED:
2247 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2249 case WLAN_HT_SMPS_CONTROL_STATIC:
2250 smps = WLAN_HT_CAP_SM_PS_STATIC;
2252 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2253 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2258 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2260 /* if no change do nothing */
2261 if ((rx->sta->sta.ht_cap.cap &
2262 IEEE80211_HT_CAP_SM_PS) == smps)
2265 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2266 rx->sta->sta.ht_cap.cap |= smps;
2268 sband = rx->local->hw.wiphy->bands[status->band];
2270 rate_control_rate_update(local, sband, rx->sta,
2271 IEEE80211_RC_SMPS_CHANGED);
2279 case WLAN_CATEGORY_BACK:
2280 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2281 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2282 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2283 sdata->vif.type != NL80211_IFTYPE_AP &&
2284 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2287 /* verify action_code is present */
2288 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2291 switch (mgmt->u.action.u.addba_req.action_code) {
2292 case WLAN_ACTION_ADDBA_REQ:
2293 if (len < (IEEE80211_MIN_ACTION_SIZE +
2294 sizeof(mgmt->u.action.u.addba_req)))
2297 case WLAN_ACTION_ADDBA_RESP:
2298 if (len < (IEEE80211_MIN_ACTION_SIZE +
2299 sizeof(mgmt->u.action.u.addba_resp)))
2302 case WLAN_ACTION_DELBA:
2303 if (len < (IEEE80211_MIN_ACTION_SIZE +
2304 sizeof(mgmt->u.action.u.delba)))
2312 case WLAN_CATEGORY_SPECTRUM_MGMT:
2313 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2316 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2319 /* verify action_code is present */
2320 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2323 switch (mgmt->u.action.u.measurement.action_code) {
2324 case WLAN_ACTION_SPCT_MSR_REQ:
2325 if (len < (IEEE80211_MIN_ACTION_SIZE +
2326 sizeof(mgmt->u.action.u.measurement)))
2328 ieee80211_process_measurement_req(sdata, mgmt, len);
2330 case WLAN_ACTION_SPCT_CHL_SWITCH:
2331 if (len < (IEEE80211_MIN_ACTION_SIZE +
2332 sizeof(mgmt->u.action.u.chan_switch)))
2335 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2338 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2344 case WLAN_CATEGORY_SA_QUERY:
2345 if (len < (IEEE80211_MIN_ACTION_SIZE +
2346 sizeof(mgmt->u.action.u.sa_query)))
2349 switch (mgmt->u.action.u.sa_query.action) {
2350 case WLAN_ACTION_SA_QUERY_REQUEST:
2351 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2353 ieee80211_process_sa_query_req(sdata, mgmt, len);
2357 case WLAN_CATEGORY_SELF_PROTECTED:
2358 switch (mgmt->u.action.u.self_prot.action_code) {
2359 case WLAN_SP_MESH_PEERING_OPEN:
2360 case WLAN_SP_MESH_PEERING_CLOSE:
2361 case WLAN_SP_MESH_PEERING_CONFIRM:
2362 if (!ieee80211_vif_is_mesh(&sdata->vif))
2364 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2365 /* userspace handles this frame */
2368 case WLAN_SP_MGK_INFORM:
2369 case WLAN_SP_MGK_ACK:
2370 if (!ieee80211_vif_is_mesh(&sdata->vif))
2375 case WLAN_CATEGORY_MESH_ACTION:
2376 if (!ieee80211_vif_is_mesh(&sdata->vif))
2378 if (mesh_action_is_path_sel(mgmt) &&
2379 (!mesh_path_sel_is_hwmp(sdata)))
2387 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2388 /* will return in the next handlers */
2393 rx->sta->rx_packets++;
2394 dev_kfree_skb(rx->skb);
2398 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2399 skb_queue_tail(&sdata->skb_queue, rx->skb);
2400 ieee80211_queue_work(&local->hw, &sdata->work);
2402 rx->sta->rx_packets++;
2406 static ieee80211_rx_result debug_noinline
2407 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2409 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2412 /* skip known-bad action frames and return them in the next handler */
2413 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2417 * Getting here means the kernel doesn't know how to handle
2418 * it, but maybe userspace does ... include returned frames
2419 * so userspace can register for those to know whether ones
2420 * it transmitted were processed or returned.
2423 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2424 sig = status->signal;
2426 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, sig,
2427 rx->skb->data, rx->skb->len,
2430 rx->sta->rx_packets++;
2431 dev_kfree_skb(rx->skb);
2439 static ieee80211_rx_result debug_noinline
2440 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2442 struct ieee80211_local *local = rx->local;
2443 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2444 struct sk_buff *nskb;
2445 struct ieee80211_sub_if_data *sdata = rx->sdata;
2446 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2448 if (!ieee80211_is_action(mgmt->frame_control))
2452 * For AP mode, hostapd is responsible for handling any action
2453 * frames that we didn't handle, including returning unknown
2454 * ones. For all other modes we will return them to the sender,
2455 * setting the 0x80 bit in the action category, as required by
2456 * 802.11-2007 7.3.1.11.
2457 * Newer versions of hostapd shall also use the management frame
2458 * registration mechanisms, but older ones still use cooked
2459 * monitor interfaces so push all frames there.
2461 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2462 (sdata->vif.type == NL80211_IFTYPE_AP ||
2463 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2464 return RX_DROP_MONITOR;
2466 /* do not return rejected action frames */
2467 if (mgmt->u.action.category & 0x80)
2468 return RX_DROP_UNUSABLE;
2470 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2473 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2475 nmgmt->u.action.category |= 0x80;
2476 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2477 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2479 memset(nskb->cb, 0, sizeof(nskb->cb));
2481 ieee80211_tx_skb(rx->sdata, nskb);
2483 dev_kfree_skb(rx->skb);
2487 static ieee80211_rx_result debug_noinline
2488 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2490 struct ieee80211_sub_if_data *sdata = rx->sdata;
2491 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2494 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2496 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2497 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2498 sdata->vif.type != NL80211_IFTYPE_STATION)
2499 return RX_DROP_MONITOR;
2502 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2503 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2504 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2505 /* process for all: mesh, mlme, ibss */
2507 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2508 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2509 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2510 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2511 if (is_multicast_ether_addr(mgmt->da) &&
2512 !is_broadcast_ether_addr(mgmt->da))
2513 return RX_DROP_MONITOR;
2515 /* process only for station */
2516 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2517 return RX_DROP_MONITOR;
2519 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2520 /* process only for ibss */
2521 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2522 return RX_DROP_MONITOR;
2525 return RX_DROP_MONITOR;
2528 /* queue up frame and kick off work to process it */
2529 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2530 skb_queue_tail(&sdata->skb_queue, rx->skb);
2531 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2533 rx->sta->rx_packets++;
2538 /* TODO: use IEEE80211_RX_FRAGMENTED */
2539 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2540 struct ieee80211_rate *rate)
2542 struct ieee80211_sub_if_data *sdata;
2543 struct ieee80211_local *local = rx->local;
2544 struct sk_buff *skb = rx->skb, *skb2;
2545 struct net_device *prev_dev = NULL;
2546 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2547 int needed_headroom;
2550 * If cooked monitor has been processed already, then
2551 * don't do it again. If not, set the flag.
2553 if (rx->flags & IEEE80211_RX_CMNTR)
2555 rx->flags |= IEEE80211_RX_CMNTR;
2557 /* If there are no cooked monitor interfaces, just free the SKB */
2558 if (!local->cooked_mntrs)
2561 /* room for the radiotap header based on driver features */
2562 needed_headroom = ieee80211_rx_radiotap_len(local, status);
2564 if (skb_headroom(skb) < needed_headroom &&
2565 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2568 /* prepend radiotap information */
2569 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2572 skb_set_mac_header(skb, 0);
2573 skb->ip_summed = CHECKSUM_UNNECESSARY;
2574 skb->pkt_type = PACKET_OTHERHOST;
2575 skb->protocol = htons(ETH_P_802_2);
2577 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2578 if (!ieee80211_sdata_running(sdata))
2581 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2582 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2586 skb2 = skb_clone(skb, GFP_ATOMIC);
2588 skb2->dev = prev_dev;
2589 netif_receive_skb(skb2);
2593 prev_dev = sdata->dev;
2594 sdata->dev->stats.rx_packets++;
2595 sdata->dev->stats.rx_bytes += skb->len;
2599 skb->dev = prev_dev;
2600 netif_receive_skb(skb);
2608 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2609 ieee80211_rx_result res)
2612 case RX_DROP_MONITOR:
2613 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2615 rx->sta->rx_dropped++;
2618 struct ieee80211_rate *rate = NULL;
2619 struct ieee80211_supported_band *sband;
2620 struct ieee80211_rx_status *status;
2622 status = IEEE80211_SKB_RXCB((rx->skb));
2624 sband = rx->local->hw.wiphy->bands[status->band];
2625 if (!(status->flag & RX_FLAG_HT))
2626 rate = &sband->bitrates[status->rate_idx];
2628 ieee80211_rx_cooked_monitor(rx, rate);
2631 case RX_DROP_UNUSABLE:
2632 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2634 rx->sta->rx_dropped++;
2635 dev_kfree_skb(rx->skb);
2638 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2643 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2645 ieee80211_rx_result res = RX_DROP_MONITOR;
2646 struct sk_buff *skb;
2648 #define CALL_RXH(rxh) \
2651 if (res != RX_CONTINUE) \
2655 spin_lock(&rx->local->rx_skb_queue.lock);
2656 if (rx->local->running_rx_handler)
2659 rx->local->running_rx_handler = true;
2661 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2662 spin_unlock(&rx->local->rx_skb_queue.lock);
2665 * all the other fields are valid across frames
2666 * that belong to an aMPDU since they are on the
2667 * same TID from the same station
2671 CALL_RXH(ieee80211_rx_h_decrypt)
2672 CALL_RXH(ieee80211_rx_h_check_more_data)
2673 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2674 CALL_RXH(ieee80211_rx_h_sta_process)
2675 CALL_RXH(ieee80211_rx_h_defragment)
2676 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2677 /* must be after MMIC verify so header is counted in MPDU mic */
2678 #ifdef CONFIG_MAC80211_MESH
2679 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2680 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2682 CALL_RXH(ieee80211_rx_h_amsdu)
2683 CALL_RXH(ieee80211_rx_h_data)
2684 CALL_RXH(ieee80211_rx_h_ctrl);
2685 CALL_RXH(ieee80211_rx_h_mgmt_check)
2686 CALL_RXH(ieee80211_rx_h_action)
2687 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2688 CALL_RXH(ieee80211_rx_h_action_return)
2689 CALL_RXH(ieee80211_rx_h_mgmt)
2692 ieee80211_rx_handlers_result(rx, res);
2693 spin_lock(&rx->local->rx_skb_queue.lock);
2697 rx->local->running_rx_handler = false;
2700 spin_unlock(&rx->local->rx_skb_queue.lock);
2703 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2705 ieee80211_rx_result res = RX_DROP_MONITOR;
2707 #define CALL_RXH(rxh) \
2710 if (res != RX_CONTINUE) \
2714 CALL_RXH(ieee80211_rx_h_passive_scan)
2715 CALL_RXH(ieee80211_rx_h_check)
2717 ieee80211_rx_reorder_ampdu(rx);
2719 ieee80211_rx_handlers(rx);
2723 ieee80211_rx_handlers_result(rx, res);
2729 * This function makes calls into the RX path, therefore
2730 * it has to be invoked under RCU read lock.
2732 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2734 struct ieee80211_rx_data rx = {
2736 .sdata = sta->sdata,
2737 .local = sta->local,
2738 /* This is OK -- must be QoS data frame */
2739 .security_idx = tid,
2743 struct tid_ampdu_rx *tid_agg_rx;
2745 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2749 spin_lock(&tid_agg_rx->reorder_lock);
2750 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2751 spin_unlock(&tid_agg_rx->reorder_lock);
2753 ieee80211_rx_handlers(&rx);
2756 /* main receive path */
2758 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2759 struct ieee80211_hdr *hdr)
2761 struct ieee80211_sub_if_data *sdata = rx->sdata;
2762 struct sk_buff *skb = rx->skb;
2763 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2764 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2765 int multicast = is_multicast_ether_addr(hdr->addr1);
2767 switch (sdata->vif.type) {
2768 case NL80211_IFTYPE_STATION:
2769 if (!bssid && !sdata->u.mgd.use_4addr)
2772 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2773 if (!(sdata->dev->flags & IFF_PROMISC) ||
2774 sdata->u.mgd.use_4addr)
2776 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2779 case NL80211_IFTYPE_ADHOC:
2782 if (ieee80211_is_beacon(hdr->frame_control)) {
2785 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2786 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2788 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2789 } else if (!multicast &&
2790 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2791 if (!(sdata->dev->flags & IFF_PROMISC))
2793 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2794 } else if (!rx->sta) {
2796 if (status->flag & RX_FLAG_HT)
2797 rate_idx = 0; /* TODO: HT rates */
2799 rate_idx = status->rate_idx;
2800 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2804 case NL80211_IFTYPE_MESH_POINT:
2806 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2807 if (!(sdata->dev->flags & IFF_PROMISC))
2810 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2813 case NL80211_IFTYPE_AP_VLAN:
2814 case NL80211_IFTYPE_AP:
2816 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2818 } else if (!ieee80211_bssid_match(bssid,
2821 * Accept public action frames even when the
2822 * BSSID doesn't match, this is used for P2P
2823 * and location updates. Note that mac80211
2824 * itself never looks at these frames.
2826 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2827 ieee80211_is_public_action(hdr, skb->len))
2829 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2830 !ieee80211_is_beacon(hdr->frame_control))
2832 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2835 case NL80211_IFTYPE_WDS:
2836 if (bssid || !ieee80211_is_data(hdr->frame_control))
2838 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
2842 /* should never get here */
2851 * This function returns whether or not the SKB
2852 * was destined for RX processing or not, which,
2853 * if consume is true, is equivalent to whether
2854 * or not the skb was consumed.
2856 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2857 struct sk_buff *skb, bool consume)
2859 struct ieee80211_local *local = rx->local;
2860 struct ieee80211_sub_if_data *sdata = rx->sdata;
2861 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2862 struct ieee80211_hdr *hdr = (void *)skb->data;
2866 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2867 prepares = prepare_for_handlers(rx, hdr);
2873 skb = skb_copy(skb, GFP_ATOMIC);
2875 if (net_ratelimit())
2876 wiphy_debug(local->hw.wiphy,
2877 "failed to copy skb for %s\n",
2885 ieee80211_invoke_rx_handlers(rx);
2890 * This is the actual Rx frames handler. as it blongs to Rx path it must
2891 * be called with rcu_read_lock protection.
2893 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2894 struct sk_buff *skb)
2896 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2897 struct ieee80211_local *local = hw_to_local(hw);
2898 struct ieee80211_sub_if_data *sdata;
2899 struct ieee80211_hdr *hdr;
2901 struct ieee80211_rx_data rx;
2902 struct ieee80211_sub_if_data *prev;
2903 struct sta_info *sta, *tmp, *prev_sta;
2906 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2907 memset(&rx, 0, sizeof(rx));
2911 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2912 local->dot11ReceivedFragmentCount++;
2914 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2915 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
2916 test_bit(SCAN_SW_SCANNING, &local->scanning)))
2917 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2919 if (ieee80211_is_mgmt(fc))
2920 err = skb_linearize(skb);
2922 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2929 hdr = (struct ieee80211_hdr *)skb->data;
2930 ieee80211_parse_qos(&rx);
2931 ieee80211_verify_alignment(&rx);
2933 if (ieee80211_is_data(fc)) {
2936 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2943 rx.sdata = prev_sta->sdata;
2944 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2951 rx.sdata = prev_sta->sdata;
2953 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2961 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2962 if (!ieee80211_sdata_running(sdata))
2965 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2966 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2970 * frame is destined for this interface, but if it's
2971 * not also for the previous one we handle that after
2972 * the loop to avoid copying the SKB once too much
2980 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2982 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2988 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2991 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3000 * This is the receive path handler. It is called by a low level driver when an
3001 * 802.11 MPDU is received from the hardware.
3003 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3005 struct ieee80211_local *local = hw_to_local(hw);
3006 struct ieee80211_rate *rate = NULL;
3007 struct ieee80211_supported_band *sband;
3008 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3010 WARN_ON_ONCE(softirq_count() == 0);
3012 if (WARN_ON(status->band < 0 ||
3013 status->band >= IEEE80211_NUM_BANDS))
3016 sband = local->hw.wiphy->bands[status->band];
3017 if (WARN_ON(!sband))
3021 * If we're suspending, it is possible although not too likely
3022 * that we'd be receiving frames after having already partially
3023 * quiesced the stack. We can't process such frames then since
3024 * that might, for example, cause stations to be added or other
3025 * driver callbacks be invoked.
3027 if (unlikely(local->quiescing || local->suspended))
3030 /* We might be during a HW reconfig, prevent Rx for the same reason */
3031 if (unlikely(local->in_reconfig))
3035 * The same happens when we're not even started,
3036 * but that's worth a warning.
3038 if (WARN_ON(!local->started))
3041 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3043 * Validate the rate, unless a PLCP error means that
3044 * we probably can't have a valid rate here anyway.
3047 if (status->flag & RX_FLAG_HT) {
3049 * rate_idx is MCS index, which can be [0-76]
3052 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3054 * Anything else would be some sort of driver or
3055 * hardware error. The driver should catch hardware
3058 if (WARN((status->rate_idx < 0 ||
3059 status->rate_idx > 76),
3060 "Rate marked as an HT rate but passed "
3061 "status->rate_idx is not "
3062 "an MCS index [0-76]: %d (0x%02x)\n",
3067 if (WARN_ON(status->rate_idx < 0 ||
3068 status->rate_idx >= sband->n_bitrates))
3070 rate = &sband->bitrates[status->rate_idx];
3074 status->rx_flags = 0;
3077 * key references and virtual interfaces are protected using RCU
3078 * and this requires that we are in a read-side RCU section during
3079 * receive processing
3084 * Frames with failed FCS/PLCP checksum are not returned,
3085 * all other frames are returned without radiotap header
3086 * if it was previously present.
3087 * Also, frames with less than 16 bytes are dropped.
3089 skb = ieee80211_rx_monitor(local, skb, rate);
3095 ieee80211_tpt_led_trig_rx(local,
3096 ((struct ieee80211_hdr *)skb->data)->frame_control,
3098 __ieee80211_rx_handle_packet(hw, skb);
3106 EXPORT_SYMBOL(ieee80211_rx);
3108 /* This is a version of the rx handler that can be called from hard irq
3109 * context. Post the skb on the queue and schedule the tasklet */
3110 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3112 struct ieee80211_local *local = hw_to_local(hw);
3114 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3116 skb->pkt_type = IEEE80211_RX_MSG;
3117 skb_queue_tail(&local->skb_queue, skb);
3118 tasklet_schedule(&local->tasklet);
3120 EXPORT_SYMBOL(ieee80211_rx_irqsafe);