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>
23 #include "ieee80211_i.h"
24 #include "driver-ops.h"
33 * monitor mode reception
35 * This function cleans up the SKB, i.e. it removes all the stuff
36 * only useful for monitoring.
38 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
41 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
42 if (likely(skb->len > FCS_LEN))
43 __pskb_trim(skb, skb->len - FCS_LEN);
55 static inline int should_drop_frame(struct sk_buff *skb,
58 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
59 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
61 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
63 if (unlikely(skb->len < 16 + present_fcs_len))
65 if (ieee80211_is_ctl(hdr->frame_control) &&
66 !ieee80211_is_pspoll(hdr->frame_control) &&
67 !ieee80211_is_back_req(hdr->frame_control))
73 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
74 struct ieee80211_rx_status *status)
78 /* always present fields */
79 len = sizeof(struct ieee80211_radiotap_header) + 9;
81 if (status->flag & RX_FLAG_MACTIME_MPDU)
83 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
86 if (len & 1) /* padding for RX_FLAGS if necessary */
89 if (status->flag & RX_FLAG_HT) /* HT info */
96 * ieee80211_add_rx_radiotap_header - add radiotap header
98 * add a radiotap header containing all the fields which the hardware provided.
101 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
103 struct ieee80211_rate *rate,
106 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
107 struct ieee80211_radiotap_header *rthdr;
111 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
112 memset(rthdr, 0, rtap_len);
114 /* radiotap header, set always present flags */
116 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
117 (1 << IEEE80211_RADIOTAP_CHANNEL) |
118 (1 << IEEE80211_RADIOTAP_ANTENNA) |
119 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
120 rthdr->it_len = cpu_to_le16(rtap_len);
122 pos = (unsigned char *)(rthdr+1);
124 /* the order of the following fields is important */
126 /* IEEE80211_RADIOTAP_TSFT */
127 if (status->flag & RX_FLAG_MACTIME_MPDU) {
128 put_unaligned_le64(status->mactime, pos);
130 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
134 /* IEEE80211_RADIOTAP_FLAGS */
135 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
136 *pos |= IEEE80211_RADIOTAP_F_FCS;
137 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
138 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
139 if (status->flag & RX_FLAG_SHORTPRE)
140 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
143 /* IEEE80211_RADIOTAP_RATE */
144 if (!rate || status->flag & RX_FLAG_HT) {
146 * Without rate information don't add it. If we have,
147 * MCS information is a separate field in radiotap,
148 * added below. The byte here is needed as padding
149 * for the channel though, so initialise it to 0.
153 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
154 *pos = rate->bitrate / 5;
158 /* IEEE80211_RADIOTAP_CHANNEL */
159 put_unaligned_le16(status->freq, pos);
161 if (status->band == IEEE80211_BAND_5GHZ)
162 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
164 else if (status->flag & RX_FLAG_HT)
165 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
167 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
168 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
171 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
174 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
177 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
178 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
179 *pos = status->signal;
181 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
185 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
187 /* IEEE80211_RADIOTAP_ANTENNA */
188 *pos = status->antenna;
191 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
193 /* IEEE80211_RADIOTAP_RX_FLAGS */
194 /* ensure 2 byte alignment for the 2 byte field as required */
195 if ((pos - (u8 *)rthdr) & 1)
197 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
198 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
199 put_unaligned_le16(rx_flags, pos);
202 if (status->flag & RX_FLAG_HT) {
203 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
204 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
205 IEEE80211_RADIOTAP_MCS_HAVE_GI |
206 IEEE80211_RADIOTAP_MCS_HAVE_BW;
208 if (status->flag & RX_FLAG_SHORT_GI)
209 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
210 if (status->flag & RX_FLAG_40MHZ)
211 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
213 *pos++ = status->rate_idx;
218 * This function copies a received frame to all monitor interfaces and
219 * returns a cleaned-up SKB that no longer includes the FCS nor the
220 * radiotap header the driver might have added.
222 static struct sk_buff *
223 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
224 struct ieee80211_rate *rate)
226 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
227 struct ieee80211_sub_if_data *sdata;
228 int needed_headroom = 0;
229 struct sk_buff *skb, *skb2;
230 struct net_device *prev_dev = NULL;
231 int present_fcs_len = 0;
234 * First, we may need to make a copy of the skb because
235 * (1) we need to modify it for radiotap (if not present), and
236 * (2) the other RX handlers will modify the skb we got.
238 * We don't need to, of course, if we aren't going to return
239 * the SKB because it has a bad FCS/PLCP checksum.
242 /* room for the radiotap header based on driver features */
243 needed_headroom = ieee80211_rx_radiotap_len(local, status);
245 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
246 present_fcs_len = FCS_LEN;
248 /* make sure hdr->frame_control is on the linear part */
249 if (!pskb_may_pull(origskb, 2)) {
250 dev_kfree_skb(origskb);
254 if (!local->monitors) {
255 if (should_drop_frame(origskb, present_fcs_len)) {
256 dev_kfree_skb(origskb);
260 return remove_monitor_info(local, origskb);
263 if (should_drop_frame(origskb, present_fcs_len)) {
264 /* only need to expand headroom if necessary */
269 * This shouldn't trigger often because most devices have an
270 * RX header they pull before we get here, and that should
271 * be big enough for our radiotap information. We should
272 * probably export the length to drivers so that we can have
273 * them allocate enough headroom to start with.
275 if (skb_headroom(skb) < needed_headroom &&
276 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
282 * Need to make a copy and possibly remove radiotap header
283 * and FCS from the original.
285 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
287 origskb = remove_monitor_info(local, origskb);
293 /* prepend radiotap information */
294 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
296 skb_reset_mac_header(skb);
297 skb->ip_summed = CHECKSUM_UNNECESSARY;
298 skb->pkt_type = PACKET_OTHERHOST;
299 skb->protocol = htons(ETH_P_802_2);
301 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
302 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
305 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
308 if (!ieee80211_sdata_running(sdata))
312 skb2 = skb_clone(skb, GFP_ATOMIC);
314 skb2->dev = prev_dev;
315 netif_receive_skb(skb2);
319 prev_dev = sdata->dev;
320 sdata->dev->stats.rx_packets++;
321 sdata->dev->stats.rx_bytes += skb->len;
326 netif_receive_skb(skb);
334 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
336 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
337 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
338 int tid, seqno_idx, security_idx;
340 /* does the frame have a qos control field? */
341 if (ieee80211_is_data_qos(hdr->frame_control)) {
342 u8 *qc = ieee80211_get_qos_ctl(hdr);
343 /* frame has qos control */
344 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
345 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
346 status->rx_flags |= IEEE80211_RX_AMSDU;
352 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
354 * Sequence numbers for management frames, QoS data
355 * frames with a broadcast/multicast address in the
356 * Address 1 field, and all non-QoS data frames sent
357 * by QoS STAs are assigned using an additional single
358 * modulo-4096 counter, [...]
360 * We also use that counter for non-QoS STAs.
362 seqno_idx = NUM_RX_DATA_QUEUES;
364 if (ieee80211_is_mgmt(hdr->frame_control))
365 security_idx = NUM_RX_DATA_QUEUES;
369 rx->seqno_idx = seqno_idx;
370 rx->security_idx = security_idx;
371 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
372 * For now, set skb->priority to 0 for other cases. */
373 rx->skb->priority = (tid > 7) ? 0 : tid;
377 * DOC: Packet alignment
379 * Drivers always need to pass packets that are aligned to two-byte boundaries
382 * Additionally, should, if possible, align the payload data in a way that
383 * guarantees that the contained IP header is aligned to a four-byte
384 * boundary. In the case of regular frames, this simply means aligning the
385 * payload to a four-byte boundary (because either the IP header is directly
386 * contained, or IV/RFC1042 headers that have a length divisible by four are
387 * in front of it). If the payload data is not properly aligned and the
388 * architecture doesn't support efficient unaligned operations, mac80211
389 * will align the data.
391 * With A-MSDU frames, however, the payload data address must yield two modulo
392 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
393 * push the IP header further back to a multiple of four again. Thankfully, the
394 * specs were sane enough this time around to require padding each A-MSDU
395 * subframe to a length that is a multiple of four.
397 * Padding like Atheros hardware adds which is between the 802.11 header and
398 * the payload is not supported, the driver is required to move the 802.11
399 * header to be directly in front of the payload in that case.
401 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
403 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
404 WARN_ONCE((unsigned long)rx->skb->data & 1,
405 "unaligned packet at 0x%p\n", rx->skb->data);
412 static ieee80211_rx_result debug_noinline
413 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
415 struct ieee80211_local *local = rx->local;
416 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
417 struct sk_buff *skb = rx->skb;
419 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
420 !local->sched_scanning))
423 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
424 local->sched_scanning)
425 return ieee80211_scan_rx(rx->sdata, skb);
427 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
428 /* drop all the other packets during a software scan anyway */
429 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
434 /* scanning finished during invoking of handlers */
435 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
436 return RX_DROP_UNUSABLE;
440 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
442 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
447 return ieee80211_is_robust_mgmt_frame(hdr);
451 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
453 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
455 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
458 return ieee80211_is_robust_mgmt_frame(hdr);
462 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
463 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
465 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
466 struct ieee80211_mmie *mmie;
468 if (skb->len < 24 + sizeof(*mmie) ||
469 !is_multicast_ether_addr(hdr->da))
472 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
473 return -1; /* not a robust management frame */
475 mmie = (struct ieee80211_mmie *)
476 (skb->data + skb->len - sizeof(*mmie));
477 if (mmie->element_id != WLAN_EID_MMIE ||
478 mmie->length != sizeof(*mmie) - 2)
481 return le16_to_cpu(mmie->key_id);
485 static ieee80211_rx_result
486 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
488 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
489 char *dev_addr = rx->sdata->vif.addr;
491 if (ieee80211_is_data(hdr->frame_control)) {
492 if (is_multicast_ether_addr(hdr->addr1)) {
493 if (ieee80211_has_tods(hdr->frame_control) ||
494 !ieee80211_has_fromds(hdr->frame_control))
495 return RX_DROP_MONITOR;
496 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
497 return RX_DROP_MONITOR;
499 if (!ieee80211_has_a4(hdr->frame_control))
500 return RX_DROP_MONITOR;
501 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
502 return RX_DROP_MONITOR;
506 /* If there is not an established peer link and this is not a peer link
507 * establisment frame, beacon or probe, drop the frame.
510 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
511 struct ieee80211_mgmt *mgmt;
513 if (!ieee80211_is_mgmt(hdr->frame_control))
514 return RX_DROP_MONITOR;
516 if (ieee80211_is_action(hdr->frame_control)) {
519 /* make sure category field is present */
520 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
521 return RX_DROP_MONITOR;
523 mgmt = (struct ieee80211_mgmt *)hdr;
524 category = mgmt->u.action.category;
525 if (category != WLAN_CATEGORY_MESH_ACTION &&
526 category != WLAN_CATEGORY_SELF_PROTECTED)
527 return RX_DROP_MONITOR;
531 if (ieee80211_is_probe_req(hdr->frame_control) ||
532 ieee80211_is_probe_resp(hdr->frame_control) ||
533 ieee80211_is_beacon(hdr->frame_control) ||
534 ieee80211_is_auth(hdr->frame_control))
537 return RX_DROP_MONITOR;
544 #define SEQ_MODULO 0x1000
545 #define SEQ_MASK 0xfff
547 static inline int seq_less(u16 sq1, u16 sq2)
549 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
552 static inline u16 seq_inc(u16 sq)
554 return (sq + 1) & SEQ_MASK;
557 static inline u16 seq_sub(u16 sq1, u16 sq2)
559 return (sq1 - sq2) & SEQ_MASK;
563 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
564 struct tid_ampdu_rx *tid_agg_rx,
567 struct ieee80211_local *local = hw_to_local(hw);
568 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
569 struct ieee80211_rx_status *status;
571 lockdep_assert_held(&tid_agg_rx->reorder_lock);
576 /* release the frame from the reorder ring buffer */
577 tid_agg_rx->stored_mpdu_num--;
578 tid_agg_rx->reorder_buf[index] = NULL;
579 status = IEEE80211_SKB_RXCB(skb);
580 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
581 skb_queue_tail(&local->rx_skb_queue, skb);
584 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
587 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
588 struct tid_ampdu_rx *tid_agg_rx,
593 lockdep_assert_held(&tid_agg_rx->reorder_lock);
595 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
596 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
597 tid_agg_rx->buf_size;
598 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
603 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
604 * the skb was added to the buffer longer than this time ago, the earlier
605 * frames that have not yet been received are assumed to be lost and the skb
606 * can be released for processing. This may also release other skb's from the
607 * reorder buffer if there are no additional gaps between the frames.
609 * Callers must hold tid_agg_rx->reorder_lock.
611 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
613 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
614 struct tid_ampdu_rx *tid_agg_rx)
618 lockdep_assert_held(&tid_agg_rx->reorder_lock);
620 /* release the buffer until next missing frame */
621 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
622 tid_agg_rx->buf_size;
623 if (!tid_agg_rx->reorder_buf[index] &&
624 tid_agg_rx->stored_mpdu_num) {
626 * No buffers ready to be released, but check whether any
627 * frames in the reorder buffer have timed out.
630 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
631 j = (j + 1) % tid_agg_rx->buf_size) {
632 if (!tid_agg_rx->reorder_buf[j]) {
637 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
638 HT_RX_REORDER_BUF_TIMEOUT))
639 goto set_release_timer;
641 #ifdef CONFIG_MAC80211_HT_DEBUG
643 wiphy_debug(hw->wiphy,
644 "release an RX reorder frame due to timeout on earlier frames\n");
646 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
649 * Increment the head seq# also for the skipped slots.
651 tid_agg_rx->head_seq_num =
652 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
655 } else while (tid_agg_rx->reorder_buf[index]) {
656 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
657 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
658 tid_agg_rx->buf_size;
661 if (tid_agg_rx->stored_mpdu_num) {
662 j = index = seq_sub(tid_agg_rx->head_seq_num,
663 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
665 for (; j != (index - 1) % tid_agg_rx->buf_size;
666 j = (j + 1) % tid_agg_rx->buf_size) {
667 if (tid_agg_rx->reorder_buf[j])
673 if (!tid_agg_rx->removed)
674 mod_timer(&tid_agg_rx->reorder_timer,
675 tid_agg_rx->reorder_time[j] + 1 +
676 HT_RX_REORDER_BUF_TIMEOUT);
678 del_timer(&tid_agg_rx->reorder_timer);
683 * As this function belongs to the RX path it must be under
684 * rcu_read_lock protection. It returns false if the frame
685 * can be processed immediately, true if it was consumed.
687 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
688 struct tid_ampdu_rx *tid_agg_rx,
691 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
692 u16 sc = le16_to_cpu(hdr->seq_ctrl);
693 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
694 u16 head_seq_num, buf_size;
698 spin_lock(&tid_agg_rx->reorder_lock);
700 buf_size = tid_agg_rx->buf_size;
701 head_seq_num = tid_agg_rx->head_seq_num;
703 /* frame with out of date sequence number */
704 if (seq_less(mpdu_seq_num, head_seq_num)) {
710 * If frame the sequence number exceeds our buffering window
711 * size release some previous frames to make room for this one.
713 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
714 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
715 /* release stored frames up to new head to stack */
716 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
719 /* Now the new frame is always in the range of the reordering buffer */
721 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
723 /* check if we already stored this frame */
724 if (tid_agg_rx->reorder_buf[index]) {
730 * If the current MPDU is in the right order and nothing else
731 * is stored we can process it directly, no need to buffer it.
732 * If it is first but there's something stored, we may be able
733 * to release frames after this one.
735 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
736 tid_agg_rx->stored_mpdu_num == 0) {
737 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
742 /* put the frame in the reordering buffer */
743 tid_agg_rx->reorder_buf[index] = skb;
744 tid_agg_rx->reorder_time[index] = jiffies;
745 tid_agg_rx->stored_mpdu_num++;
746 ieee80211_sta_reorder_release(hw, tid_agg_rx);
749 spin_unlock(&tid_agg_rx->reorder_lock);
754 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
755 * true if the MPDU was buffered, false if it should be processed.
757 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
759 struct sk_buff *skb = rx->skb;
760 struct ieee80211_local *local = rx->local;
761 struct ieee80211_hw *hw = &local->hw;
762 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
763 struct sta_info *sta = rx->sta;
764 struct tid_ampdu_rx *tid_agg_rx;
768 if (!ieee80211_is_data_qos(hdr->frame_control) ||
769 is_multicast_ether_addr(hdr->addr1))
773 * filter the QoS data rx stream according to
774 * STA/TID and check if this STA/TID is on aggregation
780 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
782 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
786 /* qos null data frames are excluded */
787 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
790 /* new, potentially un-ordered, ampdu frame - process it */
792 /* reset session timer */
793 if (tid_agg_rx->timeout)
794 mod_timer(&tid_agg_rx->session_timer,
795 TU_TO_EXP_TIME(tid_agg_rx->timeout));
797 /* if this mpdu is fragmented - terminate rx aggregation session */
798 sc = le16_to_cpu(hdr->seq_ctrl);
799 if (sc & IEEE80211_SCTL_FRAG) {
800 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
801 skb_queue_tail(&rx->sdata->skb_queue, skb);
802 ieee80211_queue_work(&local->hw, &rx->sdata->work);
807 * No locking needed -- we will only ever process one
808 * RX packet at a time, and thus own tid_agg_rx. All
809 * other code manipulating it needs to (and does) make
810 * sure that we cannot get to it any more before doing
813 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
817 skb_queue_tail(&local->rx_skb_queue, skb);
820 static ieee80211_rx_result debug_noinline
821 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
824 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
827 * Drop duplicate 802.11 retransmissions
828 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
830 if (rx->skb->len >= 24 && rx->sta &&
831 !ieee80211_is_ctl(hdr->frame_control) &&
832 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
833 !is_multicast_ether_addr(hdr->addr1)) {
834 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
835 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
837 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
838 rx->local->dot11FrameDuplicateCount++;
839 rx->sta->num_duplicates++;
841 return RX_DROP_UNUSABLE;
843 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
846 if (unlikely(rx->skb->len < 16)) {
847 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
848 return RX_DROP_MONITOR;
851 /* Drop disallowed frame classes based on STA auth/assoc state;
852 * IEEE 802.11, Chap 5.5.
854 * mac80211 filters only based on association state, i.e. it drops
855 * Class 3 frames from not associated stations. hostapd sends
856 * deauth/disassoc frames when needed. In addition, hostapd is
857 * responsible for filtering on both auth and assoc states.
860 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
861 return ieee80211_rx_mesh_check(rx);
863 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
864 ieee80211_is_pspoll(hdr->frame_control)) &&
865 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
866 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
867 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
868 if (rx->sta && rx->sta->dummy &&
869 ieee80211_is_data_present(hdr->frame_control)) {
873 hdrlen = ieee80211_hdrlen(hdr->frame_control);
875 if (rx->skb->len < hdrlen + 8)
876 return RX_DROP_MONITOR;
878 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
879 if (ethertype == rx->sdata->control_port_protocol)
882 return RX_DROP_MONITOR;
889 static ieee80211_rx_result debug_noinline
890 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
892 struct sk_buff *skb = rx->skb;
893 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
894 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
897 ieee80211_rx_result result = RX_DROP_UNUSABLE;
898 struct ieee80211_key *sta_ptk = NULL;
899 int mmie_keyidx = -1;
905 * There are four types of keys:
907 * - IGTK (group keys for management frames)
908 * - PTK (pairwise keys)
909 * - STK (station-to-station pairwise keys)
911 * When selecting a key, we have to distinguish between multicast
912 * (including broadcast) and unicast frames, the latter can only
913 * use PTKs and STKs while the former always use GTKs and IGTKs.
914 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
915 * unicast frames can also use key indices like GTKs. Hence, if we
916 * don't have a PTK/STK we check the key index for a WEP key.
918 * Note that in a regular BSS, multicast frames are sent by the
919 * AP only, associated stations unicast the frame to the AP first
920 * which then multicasts it on their behalf.
922 * There is also a slight problem in IBSS mode: GTKs are negotiated
923 * with each station, that is something we don't currently handle.
924 * The spec seems to expect that one negotiates the same key with
925 * every station but there's no such requirement; VLANs could be
930 * No point in finding a key and decrypting if the frame is neither
931 * addressed to us nor a multicast frame.
933 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
936 /* start without a key */
940 sta_ptk = rcu_dereference(rx->sta->ptk);
942 fc = hdr->frame_control;
944 if (!ieee80211_has_protected(fc))
945 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
947 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
949 if ((status->flag & RX_FLAG_DECRYPTED) &&
950 (status->flag & RX_FLAG_IV_STRIPPED))
952 /* Skip decryption if the frame is not protected. */
953 if (!ieee80211_has_protected(fc))
955 } else if (mmie_keyidx >= 0) {
956 /* Broadcast/multicast robust management frame / BIP */
957 if ((status->flag & RX_FLAG_DECRYPTED) &&
958 (status->flag & RX_FLAG_IV_STRIPPED))
961 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
962 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
963 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
965 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
967 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
968 } else if (!ieee80211_has_protected(fc)) {
970 * The frame was not protected, so skip decryption. However, we
971 * need to set rx->key if there is a key that could have been
972 * used so that the frame may be dropped if encryption would
973 * have been expected.
975 struct ieee80211_key *key = NULL;
976 struct ieee80211_sub_if_data *sdata = rx->sdata;
979 if (ieee80211_is_mgmt(fc) &&
980 is_multicast_ether_addr(hdr->addr1) &&
981 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
985 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
986 key = rcu_dereference(rx->sta->gtk[i]);
992 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
993 key = rcu_dereference(sdata->keys[i]);
1005 * The device doesn't give us the IV so we won't be
1006 * able to look up the key. That's ok though, we
1007 * don't need to decrypt the frame, we just won't
1008 * be able to keep statistics accurate.
1009 * Except for key threshold notifications, should
1010 * we somehow allow the driver to tell us which key
1011 * the hardware used if this flag is set?
1013 if ((status->flag & RX_FLAG_DECRYPTED) &&
1014 (status->flag & RX_FLAG_IV_STRIPPED))
1017 hdrlen = ieee80211_hdrlen(fc);
1019 if (rx->skb->len < 8 + hdrlen)
1020 return RX_DROP_UNUSABLE; /* TODO: count this? */
1023 * no need to call ieee80211_wep_get_keyidx,
1024 * it verifies a bunch of things we've done already
1026 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1027 keyidx = keyid >> 6;
1029 /* check per-station GTK first, if multicast packet */
1030 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1031 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1033 /* if not found, try default key */
1035 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1038 * RSNA-protected unicast frames should always be
1039 * sent with pairwise or station-to-station keys,
1040 * but for WEP we allow using a key index as well.
1043 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1044 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1045 !is_multicast_ether_addr(hdr->addr1))
1051 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1052 return RX_DROP_MONITOR;
1054 rx->key->tx_rx_count++;
1055 /* TODO: add threshold stuff again */
1057 return RX_DROP_MONITOR;
1060 if (skb_linearize(rx->skb))
1061 return RX_DROP_UNUSABLE;
1062 /* the hdr variable is invalid now! */
1064 switch (rx->key->conf.cipher) {
1065 case WLAN_CIPHER_SUITE_WEP40:
1066 case WLAN_CIPHER_SUITE_WEP104:
1067 /* Check for weak IVs if possible */
1068 if (rx->sta && ieee80211_is_data(fc) &&
1069 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1070 !(status->flag & RX_FLAG_DECRYPTED)) &&
1071 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1072 rx->sta->wep_weak_iv_count++;
1074 result = ieee80211_crypto_wep_decrypt(rx);
1076 case WLAN_CIPHER_SUITE_TKIP:
1077 result = ieee80211_crypto_tkip_decrypt(rx);
1079 case WLAN_CIPHER_SUITE_CCMP:
1080 result = ieee80211_crypto_ccmp_decrypt(rx);
1082 case WLAN_CIPHER_SUITE_AES_CMAC:
1083 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1087 * We can reach here only with HW-only algorithms
1088 * but why didn't it decrypt the frame?!
1090 return RX_DROP_UNUSABLE;
1093 /* either the frame has been decrypted or will be dropped */
1094 status->flag |= RX_FLAG_DECRYPTED;
1099 static ieee80211_rx_result debug_noinline
1100 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1102 struct ieee80211_local *local;
1103 struct ieee80211_hdr *hdr;
1104 struct sk_buff *skb;
1108 hdr = (struct ieee80211_hdr *) skb->data;
1110 if (!local->pspolling)
1113 if (!ieee80211_has_fromds(hdr->frame_control))
1114 /* this is not from AP */
1117 if (!ieee80211_is_data(hdr->frame_control))
1120 if (!ieee80211_has_moredata(hdr->frame_control)) {
1121 /* AP has no more frames buffered for us */
1122 local->pspolling = false;
1126 /* more data bit is set, let's request a new frame from the AP */
1127 ieee80211_send_pspoll(local, rx->sdata);
1132 static void ap_sta_ps_start(struct sta_info *sta)
1134 struct ieee80211_sub_if_data *sdata = sta->sdata;
1135 struct ieee80211_local *local = sdata->local;
1137 atomic_inc(&sdata->bss->num_sta_ps);
1138 set_sta_flag(sta, WLAN_STA_PS_STA);
1139 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1140 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1141 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1142 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1143 sdata->name, sta->sta.addr, sta->sta.aid);
1144 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1147 static void ap_sta_ps_end(struct sta_info *sta)
1149 struct ieee80211_sub_if_data *sdata = sta->sdata;
1151 atomic_dec(&sdata->bss->num_sta_ps);
1153 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1154 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1155 sdata->name, sta->sta.addr, sta->sta.aid);
1156 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1158 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1159 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1160 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1161 sdata->name, sta->sta.addr, sta->sta.aid);
1162 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1166 ieee80211_sta_ps_deliver_wakeup(sta);
1169 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1171 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1174 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1176 /* Don't let the same PS state be set twice */
1177 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1178 if ((start && in_ps) || (!start && !in_ps))
1182 ap_sta_ps_start(sta_inf);
1184 ap_sta_ps_end(sta_inf);
1188 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1190 static ieee80211_rx_result debug_noinline
1191 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1193 struct ieee80211_sub_if_data *sdata = rx->sdata;
1194 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1195 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1198 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1201 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1202 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1206 * The device handles station powersave, so don't do anything about
1207 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1208 * it to mac80211 since they're handled.)
1210 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1214 * Don't do anything if the station isn't already asleep. In
1215 * the uAPSD case, the station will probably be marked asleep,
1216 * in the PS-Poll case the station must be confused ...
1218 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1221 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1222 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1223 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1224 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1226 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1229 /* Free PS Poll skb here instead of returning RX_DROP that would
1230 * count as an dropped frame. */
1231 dev_kfree_skb(rx->skb);
1234 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1235 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1236 ieee80211_has_pm(hdr->frame_control) &&
1237 (ieee80211_is_data_qos(hdr->frame_control) ||
1238 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1239 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1240 ac = ieee802_1d_to_ac[tid & 7];
1243 * If this AC is not trigger-enabled do nothing.
1245 * NB: This could/should check a separate bitmap of trigger-
1246 * enabled queues, but for now we only implement uAPSD w/o
1247 * TSPEC changes to the ACs, so they're always the same.
1249 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1252 /* if we are in a service period, do nothing */
1253 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1256 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1257 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1259 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1265 static ieee80211_rx_result debug_noinline
1266 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1268 struct sta_info *sta = rx->sta;
1269 struct sk_buff *skb = rx->skb;
1270 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1271 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1277 * Update last_rx only for IBSS packets which are for the current
1278 * BSSID to avoid keeping the current IBSS network alive in cases
1279 * where other STAs start using different BSSID.
1281 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1282 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1283 NL80211_IFTYPE_ADHOC);
1284 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
1285 sta->last_rx = jiffies;
1286 if (ieee80211_is_data(hdr->frame_control)) {
1287 sta->last_rx_rate_idx = status->rate_idx;
1288 sta->last_rx_rate_flag = status->flag;
1291 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1293 * Mesh beacons will update last_rx when if they are found to
1294 * match the current local configuration when processed.
1296 sta->last_rx = jiffies;
1297 if (ieee80211_is_data(hdr->frame_control)) {
1298 sta->last_rx_rate_idx = status->rate_idx;
1299 sta->last_rx_rate_flag = status->flag;
1303 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1306 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1307 ieee80211_sta_rx_notify(rx->sdata, hdr);
1309 sta->rx_fragments++;
1310 sta->rx_bytes += rx->skb->len;
1311 sta->last_signal = status->signal;
1312 ewma_add(&sta->avg_signal, -status->signal);
1315 * Change STA power saving mode only at the end of a frame
1316 * exchange sequence.
1318 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1319 !ieee80211_has_morefrags(hdr->frame_control) &&
1320 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1321 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1322 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1323 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1325 * Ignore doze->wake transitions that are
1326 * indicated by non-data frames, the standard
1327 * is unclear here, but for example going to
1328 * PS mode and then scanning would cause a
1329 * doze->wake transition for the probe request,
1330 * and that is clearly undesirable.
1332 if (ieee80211_is_data(hdr->frame_control) &&
1333 !ieee80211_has_pm(hdr->frame_control))
1336 if (ieee80211_has_pm(hdr->frame_control))
1337 ap_sta_ps_start(sta);
1342 * Drop (qos-)data::nullfunc frames silently, since they
1343 * are used only to control station power saving mode.
1345 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1346 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1347 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1350 * If we receive a 4-addr nullfunc frame from a STA
1351 * that was not moved to a 4-addr STA vlan yet, drop
1352 * the frame to the monitor interface, to make sure
1353 * that hostapd sees it
1355 if (ieee80211_has_a4(hdr->frame_control) &&
1356 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1357 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1358 !rx->sdata->u.vlan.sta)))
1359 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;
1468 if (ieee80211_is_ctl(fc))
1471 sc = le16_to_cpu(hdr->seq_ctrl);
1472 frag = sc & IEEE80211_SCTL_FRAG;
1474 if (is_multicast_ether_addr(hdr->addr1)) {
1475 rx->local->dot11MulticastReceivedFrameCount++;
1479 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1482 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1484 if (skb_linearize(rx->skb))
1485 return RX_DROP_UNUSABLE;
1488 * skb_linearize() might change the skb->data and
1489 * previously cached variables (in this case, hdr) need to
1490 * be refreshed with the new data.
1492 hdr = (struct ieee80211_hdr *)rx->skb->data;
1493 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1496 /* This is the first fragment of a new frame. */
1497 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1498 rx->seqno_idx, &(rx->skb));
1499 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1500 ieee80211_has_protected(fc)) {
1501 int queue = rx->security_idx;
1502 /* Store CCMP PN so that we can verify that the next
1503 * fragment has a sequential PN value. */
1505 memcpy(entry->last_pn,
1506 rx->key->u.ccmp.rx_pn[queue],
1512 /* This is a fragment for a frame that should already be pending in
1513 * fragment cache. Add this fragment to the end of the pending entry.
1515 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1516 rx->seqno_idx, hdr);
1518 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1519 return RX_DROP_MONITOR;
1522 /* Verify that MPDUs within one MSDU have sequential PN values.
1523 * (IEEE 802.11i, 8.3.3.4.5) */
1526 u8 pn[CCMP_PN_LEN], *rpn;
1528 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1529 return RX_DROP_UNUSABLE;
1530 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1531 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1536 queue = rx->security_idx;
1537 rpn = rx->key->u.ccmp.rx_pn[queue];
1538 if (memcmp(pn, rpn, CCMP_PN_LEN))
1539 return RX_DROP_UNUSABLE;
1540 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1543 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1544 __skb_queue_tail(&entry->skb_list, rx->skb);
1545 entry->last_frag = frag;
1546 entry->extra_len += rx->skb->len;
1547 if (ieee80211_has_morefrags(fc)) {
1552 rx->skb = __skb_dequeue(&entry->skb_list);
1553 if (skb_tailroom(rx->skb) < entry->extra_len) {
1554 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1555 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1557 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1558 __skb_queue_purge(&entry->skb_list);
1559 return RX_DROP_UNUSABLE;
1562 while ((skb = __skb_dequeue(&entry->skb_list))) {
1563 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1567 /* Complete frame has been reassembled - process it now */
1568 status = IEEE80211_SKB_RXCB(rx->skb);
1569 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1572 ieee80211_led_rx(rx->local);
1575 rx->sta->rx_packets++;
1579 static ieee80211_rx_result debug_noinline
1580 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1582 u8 *data = rx->skb->data;
1583 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1585 if (!ieee80211_is_data_qos(hdr->frame_control))
1588 /* remove the qos control field, update frame type and meta-data */
1589 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1590 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1591 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1592 /* change frame type to non QOS */
1593 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1599 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1601 if (unlikely(!rx->sta ||
1602 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1609 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1611 struct sk_buff *skb = rx->skb;
1612 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1615 * Pass through unencrypted frames if the hardware has
1616 * decrypted them already.
1618 if (status->flag & RX_FLAG_DECRYPTED)
1621 /* Drop unencrypted frames if key is set. */
1622 if (unlikely(!ieee80211_has_protected(fc) &&
1623 !ieee80211_is_nullfunc(fc) &&
1624 ieee80211_is_data(fc) &&
1625 (rx->key || rx->sdata->drop_unencrypted)))
1632 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1634 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1635 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1636 __le16 fc = hdr->frame_control;
1639 * Pass through unencrypted frames if the hardware has
1640 * decrypted them already.
1642 if (status->flag & RX_FLAG_DECRYPTED)
1645 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1646 if (unlikely(!ieee80211_has_protected(fc) &&
1647 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1649 if (ieee80211_is_deauth(fc))
1650 cfg80211_send_unprot_deauth(rx->sdata->dev,
1653 else if (ieee80211_is_disassoc(fc))
1654 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1659 /* BIP does not use Protected field, so need to check MMIE */
1660 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1661 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1662 if (ieee80211_is_deauth(fc))
1663 cfg80211_send_unprot_deauth(rx->sdata->dev,
1666 else if (ieee80211_is_disassoc(fc))
1667 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1673 * When using MFP, Action frames are not allowed prior to
1674 * having configured keys.
1676 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1677 ieee80211_is_robust_mgmt_frame(
1678 (struct ieee80211_hdr *) rx->skb->data)))
1686 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1688 struct ieee80211_sub_if_data *sdata = rx->sdata;
1689 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1690 bool check_port_control = false;
1691 struct ethhdr *ehdr;
1694 *port_control = false;
1695 if (ieee80211_has_a4(hdr->frame_control) &&
1696 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1699 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1700 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1702 if (!sdata->u.mgd.use_4addr)
1705 check_port_control = true;
1708 if (is_multicast_ether_addr(hdr->addr1) &&
1709 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1712 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1716 ehdr = (struct ethhdr *) rx->skb->data;
1717 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1718 *port_control = true;
1719 else if (check_port_control)
1726 * requires that rx->skb is a frame with ethernet header
1728 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1730 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1731 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1732 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1735 * Allow EAPOL frames to us/the PAE group address regardless
1736 * of whether the frame was encrypted or not.
1738 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1739 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1740 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1743 if (ieee80211_802_1x_port_control(rx) ||
1744 ieee80211_drop_unencrypted(rx, fc))
1751 * requires that rx->skb is a frame with ethernet header
1754 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1756 struct ieee80211_sub_if_data *sdata = rx->sdata;
1757 struct net_device *dev = sdata->dev;
1758 struct sk_buff *skb, *xmit_skb;
1759 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1760 struct sta_info *dsta;
1761 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1766 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1767 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1768 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1769 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1770 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1771 if (is_multicast_ether_addr(ehdr->h_dest)) {
1773 * send multicast frames both to higher layers in
1774 * local net stack and back to the wireless medium
1776 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1777 if (!xmit_skb && net_ratelimit())
1778 printk(KERN_DEBUG "%s: failed to clone "
1779 "multicast frame\n", dev->name);
1781 dsta = sta_info_get(sdata, skb->data);
1784 * The destination station is associated to
1785 * this AP (in this VLAN), so send the frame
1786 * directly to it and do not pass it to local
1796 int align __maybe_unused;
1798 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1800 * 'align' will only take the values 0 or 2 here
1801 * since all frames are required to be aligned
1802 * to 2-byte boundaries when being passed to
1803 * mac80211. That also explains the __skb_push()
1806 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1808 if (WARN_ON(skb_headroom(skb) < 3)) {
1812 u8 *data = skb->data;
1813 size_t len = skb_headlen(skb);
1815 memmove(skb->data, data, len);
1816 skb_set_tail_pointer(skb, len);
1822 /* deliver to local stack */
1823 skb->protocol = eth_type_trans(skb, dev);
1824 memset(skb->cb, 0, sizeof(skb->cb));
1825 netif_receive_skb(skb);
1830 /* send to wireless media */
1831 xmit_skb->protocol = htons(ETH_P_802_3);
1832 skb_reset_network_header(xmit_skb);
1833 skb_reset_mac_header(xmit_skb);
1834 dev_queue_xmit(xmit_skb);
1838 static ieee80211_rx_result debug_noinline
1839 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1841 struct net_device *dev = rx->sdata->dev;
1842 struct sk_buff *skb = rx->skb;
1843 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1844 __le16 fc = hdr->frame_control;
1845 struct sk_buff_head frame_list;
1846 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1848 if (unlikely(!ieee80211_is_data(fc)))
1851 if (unlikely(!ieee80211_is_data_present(fc)))
1852 return RX_DROP_MONITOR;
1854 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1857 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
1858 switch (rx->sdata->vif.type) {
1859 case NL80211_IFTYPE_AP_VLAN:
1860 if (!rx->sdata->u.vlan.sta)
1861 return RX_DROP_UNUSABLE;
1863 case NL80211_IFTYPE_STATION:
1864 if (!rx->sdata->u.mgd.use_4addr)
1865 return RX_DROP_UNUSABLE;
1868 return RX_DROP_UNUSABLE;
1872 if (is_multicast_ether_addr(hdr->addr1))
1873 return RX_DROP_UNUSABLE;
1876 __skb_queue_head_init(&frame_list);
1878 if (skb_linearize(skb))
1879 return RX_DROP_UNUSABLE;
1881 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1882 rx->sdata->vif.type,
1883 rx->local->hw.extra_tx_headroom, true);
1885 while (!skb_queue_empty(&frame_list)) {
1886 rx->skb = __skb_dequeue(&frame_list);
1888 if (!ieee80211_frame_allowed(rx, fc)) {
1889 dev_kfree_skb(rx->skb);
1892 dev->stats.rx_packets++;
1893 dev->stats.rx_bytes += rx->skb->len;
1895 ieee80211_deliver_skb(rx);
1901 #ifdef CONFIG_MAC80211_MESH
1902 static ieee80211_rx_result
1903 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1905 struct ieee80211_hdr *hdr;
1906 struct ieee80211s_hdr *mesh_hdr;
1907 unsigned int hdrlen;
1908 struct sk_buff *skb = rx->skb, *fwd_skb;
1909 struct ieee80211_local *local = rx->local;
1910 struct ieee80211_sub_if_data *sdata = rx->sdata;
1911 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1913 hdr = (struct ieee80211_hdr *) skb->data;
1914 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1916 /* make sure fixed part of mesh header is there, also checks skb len */
1917 if (!pskb_may_pull(rx->skb, hdrlen + 6))
1918 return RX_DROP_MONITOR;
1920 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1922 /* make sure full mesh header is there, also checks skb len */
1923 if (!pskb_may_pull(rx->skb,
1924 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
1925 return RX_DROP_MONITOR;
1927 /* reload pointers */
1928 hdr = (struct ieee80211_hdr *) skb->data;
1929 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1931 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
1932 return RX_DROP_MONITOR;
1934 /* frame is in RMC, don't forward */
1935 if (ieee80211_is_data(hdr->frame_control) &&
1936 is_multicast_ether_addr(hdr->addr1) &&
1937 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1938 return RX_DROP_MONITOR;
1940 if (!ieee80211_is_data(hdr->frame_control) ||
1941 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1946 return RX_DROP_MONITOR;
1948 if (ieee80211_queue_stopped(&local->hw, skb_get_queue_mapping(skb))) {
1949 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1950 dropped_frames_congestion);
1951 return RX_DROP_MONITOR;
1954 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1955 struct mesh_path *mppath;
1959 if (is_multicast_ether_addr(hdr->addr1)) {
1960 mpp_addr = hdr->addr3;
1961 proxied_addr = mesh_hdr->eaddr1;
1962 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
1963 /* has_a4 already checked in ieee80211_rx_mesh_check */
1964 mpp_addr = hdr->addr4;
1965 proxied_addr = mesh_hdr->eaddr2;
1967 return RX_DROP_MONITOR;
1971 mppath = mpp_path_lookup(proxied_addr, sdata);
1973 mpp_path_add(proxied_addr, mpp_addr, sdata);
1975 spin_lock_bh(&mppath->state_lock);
1976 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1977 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1978 spin_unlock_bh(&mppath->state_lock);
1983 /* Frame has reached destination. Don't forward */
1984 if (!is_multicast_ether_addr(hdr->addr1) &&
1985 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1992 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1993 dropped_frames_ttl);
1995 struct ieee80211_hdr *fwd_hdr;
1996 struct ieee80211_tx_info *info;
1998 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2000 if (!fwd_skb && net_ratelimit())
2001 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
2006 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2007 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2008 info = IEEE80211_SKB_CB(fwd_skb);
2009 memset(info, 0, sizeof(*info));
2010 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2011 info->control.vif = &rx->sdata->vif;
2012 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2013 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
2015 skb_set_queue_mapping(fwd_skb,
2016 ieee80211_select_queue(sdata, fwd_skb));
2017 ieee80211_set_qos_hdr(sdata, fwd_skb);
2021 * Save TA to addr1 to send TA a path error if a
2022 * suitable next hop is not found
2024 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
2026 err = mesh_nexthop_lookup(fwd_skb, sdata);
2027 /* Failed to immediately resolve next hop:
2028 * fwded frame was dropped or will be added
2029 * later to the pending skb queue. */
2031 return RX_DROP_MONITOR;
2033 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
2036 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
2038 ieee80211_add_pending_skb(local, fwd_skb);
2043 if (is_multicast_ether_addr(hdr->addr1) ||
2044 sdata->dev->flags & IFF_PROMISC)
2047 return RX_DROP_MONITOR;
2051 static ieee80211_rx_result debug_noinline
2052 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2054 struct ieee80211_sub_if_data *sdata = rx->sdata;
2055 struct ieee80211_local *local = rx->local;
2056 struct net_device *dev = sdata->dev;
2057 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2058 __le16 fc = hdr->frame_control;
2062 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2065 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2066 return RX_DROP_MONITOR;
2069 * Allow the cooked monitor interface of an AP to see 4-addr frames so
2070 * that a 4-addr station can be detected and moved into a separate VLAN
2072 if (ieee80211_has_a4(hdr->frame_control) &&
2073 sdata->vif.type == NL80211_IFTYPE_AP)
2074 return RX_DROP_MONITOR;
2076 err = __ieee80211_data_to_8023(rx, &port_control);
2078 return RX_DROP_UNUSABLE;
2080 if (!ieee80211_frame_allowed(rx, fc))
2081 return RX_DROP_MONITOR;
2083 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2084 unlikely(port_control) && sdata->bss) {
2085 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2093 dev->stats.rx_packets++;
2094 dev->stats.rx_bytes += rx->skb->len;
2096 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2097 !is_multicast_ether_addr(
2098 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2099 (!local->scanning &&
2100 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2101 mod_timer(&local->dynamic_ps_timer, jiffies +
2102 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2105 ieee80211_deliver_skb(rx);
2110 static ieee80211_rx_result debug_noinline
2111 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2113 struct ieee80211_local *local = rx->local;
2114 struct ieee80211_hw *hw = &local->hw;
2115 struct sk_buff *skb = rx->skb;
2116 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2117 struct tid_ampdu_rx *tid_agg_rx;
2121 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2124 if (ieee80211_is_back_req(bar->frame_control)) {
2126 __le16 control, start_seq_num;
2127 } __packed bar_data;
2130 return RX_DROP_MONITOR;
2132 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2133 &bar_data, sizeof(bar_data)))
2134 return RX_DROP_MONITOR;
2136 tid = le16_to_cpu(bar_data.control) >> 12;
2138 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2140 return RX_DROP_MONITOR;
2142 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2144 /* reset session timer */
2145 if (tid_agg_rx->timeout)
2146 mod_timer(&tid_agg_rx->session_timer,
2147 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2149 spin_lock(&tid_agg_rx->reorder_lock);
2150 /* release stored frames up to start of BAR */
2151 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2152 spin_unlock(&tid_agg_rx->reorder_lock);
2159 * After this point, we only want management frames,
2160 * so we can drop all remaining control frames to
2161 * cooked monitor interfaces.
2163 return RX_DROP_MONITOR;
2166 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2167 struct ieee80211_mgmt *mgmt,
2170 struct ieee80211_local *local = sdata->local;
2171 struct sk_buff *skb;
2172 struct ieee80211_mgmt *resp;
2174 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2175 /* Not to own unicast address */
2179 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2180 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2181 /* Not from the current AP or not associated yet. */
2185 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2186 /* Too short SA Query request frame */
2190 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2194 skb_reserve(skb, local->hw.extra_tx_headroom);
2195 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2196 memset(resp, 0, 24);
2197 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2198 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2199 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2200 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2201 IEEE80211_STYPE_ACTION);
2202 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2203 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2204 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2205 memcpy(resp->u.action.u.sa_query.trans_id,
2206 mgmt->u.action.u.sa_query.trans_id,
2207 WLAN_SA_QUERY_TR_ID_LEN);
2209 ieee80211_tx_skb(sdata, skb);
2212 static ieee80211_rx_result debug_noinline
2213 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2215 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2216 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2219 * From here on, look only at management frames.
2220 * Data and control frames are already handled,
2221 * and unknown (reserved) frames are useless.
2223 if (rx->skb->len < 24)
2224 return RX_DROP_MONITOR;
2226 if (!ieee80211_is_mgmt(mgmt->frame_control))
2227 return RX_DROP_MONITOR;
2229 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2230 return RX_DROP_MONITOR;
2232 if (ieee80211_drop_unencrypted_mgmt(rx))
2233 return RX_DROP_UNUSABLE;
2238 static ieee80211_rx_result debug_noinline
2239 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2241 struct ieee80211_local *local = rx->local;
2242 struct ieee80211_sub_if_data *sdata = rx->sdata;
2243 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2244 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2245 int len = rx->skb->len;
2247 if (!ieee80211_is_action(mgmt->frame_control))
2250 /* drop too small frames */
2251 if (len < IEEE80211_MIN_ACTION_SIZE)
2252 return RX_DROP_UNUSABLE;
2254 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2255 return RX_DROP_UNUSABLE;
2257 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2258 return RX_DROP_UNUSABLE;
2260 switch (mgmt->u.action.category) {
2261 case WLAN_CATEGORY_BACK:
2263 * The aggregation code is not prepared to handle
2264 * anything but STA/AP due to the BSSID handling;
2265 * IBSS could work in the code but isn't supported
2266 * by drivers or the standard.
2268 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2269 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2270 sdata->vif.type != NL80211_IFTYPE_AP)
2273 /* verify action_code is present */
2274 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2277 switch (mgmt->u.action.u.addba_req.action_code) {
2278 case WLAN_ACTION_ADDBA_REQ:
2279 if (len < (IEEE80211_MIN_ACTION_SIZE +
2280 sizeof(mgmt->u.action.u.addba_req)))
2283 case WLAN_ACTION_ADDBA_RESP:
2284 if (len < (IEEE80211_MIN_ACTION_SIZE +
2285 sizeof(mgmt->u.action.u.addba_resp)))
2288 case WLAN_ACTION_DELBA:
2289 if (len < (IEEE80211_MIN_ACTION_SIZE +
2290 sizeof(mgmt->u.action.u.delba)))
2298 case WLAN_CATEGORY_SPECTRUM_MGMT:
2299 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2302 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2305 /* verify action_code is present */
2306 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2309 switch (mgmt->u.action.u.measurement.action_code) {
2310 case WLAN_ACTION_SPCT_MSR_REQ:
2311 if (len < (IEEE80211_MIN_ACTION_SIZE +
2312 sizeof(mgmt->u.action.u.measurement)))
2314 ieee80211_process_measurement_req(sdata, mgmt, len);
2316 case WLAN_ACTION_SPCT_CHL_SWITCH:
2317 if (len < (IEEE80211_MIN_ACTION_SIZE +
2318 sizeof(mgmt->u.action.u.chan_switch)))
2321 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2324 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2330 case WLAN_CATEGORY_SA_QUERY:
2331 if (len < (IEEE80211_MIN_ACTION_SIZE +
2332 sizeof(mgmt->u.action.u.sa_query)))
2335 switch (mgmt->u.action.u.sa_query.action) {
2336 case WLAN_ACTION_SA_QUERY_REQUEST:
2337 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2339 ieee80211_process_sa_query_req(sdata, mgmt, len);
2343 case WLAN_CATEGORY_SELF_PROTECTED:
2344 if (len < (IEEE80211_MIN_ACTION_SIZE +
2345 sizeof(mgmt->u.action.u.self_prot.action_code)))
2348 switch (mgmt->u.action.u.self_prot.action_code) {
2349 case WLAN_SP_MESH_PEERING_OPEN:
2350 case WLAN_SP_MESH_PEERING_CLOSE:
2351 case WLAN_SP_MESH_PEERING_CONFIRM:
2352 if (!ieee80211_vif_is_mesh(&sdata->vif))
2354 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2355 /* userspace handles this frame */
2358 case WLAN_SP_MGK_INFORM:
2359 case WLAN_SP_MGK_ACK:
2360 if (!ieee80211_vif_is_mesh(&sdata->vif))
2365 case WLAN_CATEGORY_MESH_ACTION:
2366 if (len < (IEEE80211_MIN_ACTION_SIZE +
2367 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2370 if (!ieee80211_vif_is_mesh(&sdata->vif))
2372 if (mesh_action_is_path_sel(mgmt) &&
2373 (!mesh_path_sel_is_hwmp(sdata)))
2381 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2382 /* will return in the next handlers */
2387 rx->sta->rx_packets++;
2388 dev_kfree_skb(rx->skb);
2392 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2393 skb_queue_tail(&sdata->skb_queue, rx->skb);
2394 ieee80211_queue_work(&local->hw, &sdata->work);
2396 rx->sta->rx_packets++;
2400 static ieee80211_rx_result debug_noinline
2401 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2403 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2405 /* skip known-bad action frames and return them in the next handler */
2406 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2410 * Getting here means the kernel doesn't know how to handle
2411 * it, but maybe userspace does ... include returned frames
2412 * so userspace can register for those to know whether ones
2413 * it transmitted were processed or returned.
2416 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2417 rx->skb->data, rx->skb->len,
2420 rx->sta->rx_packets++;
2421 dev_kfree_skb(rx->skb);
2429 static ieee80211_rx_result debug_noinline
2430 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2432 struct ieee80211_local *local = rx->local;
2433 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2434 struct sk_buff *nskb;
2435 struct ieee80211_sub_if_data *sdata = rx->sdata;
2436 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2438 if (!ieee80211_is_action(mgmt->frame_control))
2442 * For AP mode, hostapd is responsible for handling any action
2443 * frames that we didn't handle, including returning unknown
2444 * ones. For all other modes we will return them to the sender,
2445 * setting the 0x80 bit in the action category, as required by
2446 * 802.11-2012 9.24.4.
2447 * Newer versions of hostapd shall also use the management frame
2448 * registration mechanisms, but older ones still use cooked
2449 * monitor interfaces so push all frames there.
2451 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2452 (sdata->vif.type == NL80211_IFTYPE_AP ||
2453 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2454 return RX_DROP_MONITOR;
2456 if (is_multicast_ether_addr(mgmt->da))
2457 return RX_DROP_MONITOR;
2459 /* do not return rejected action frames */
2460 if (mgmt->u.action.category & 0x80)
2461 return RX_DROP_UNUSABLE;
2463 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2466 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2468 nmgmt->u.action.category |= 0x80;
2469 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2470 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2472 memset(nskb->cb, 0, sizeof(nskb->cb));
2474 ieee80211_tx_skb(rx->sdata, nskb);
2476 dev_kfree_skb(rx->skb);
2480 static ieee80211_rx_result debug_noinline
2481 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2483 struct ieee80211_sub_if_data *sdata = rx->sdata;
2484 ieee80211_rx_result rxs;
2485 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2488 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2489 if (rxs != RX_CONTINUE)
2492 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2494 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2495 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2496 sdata->vif.type != NL80211_IFTYPE_STATION)
2497 return RX_DROP_MONITOR;
2500 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2501 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2502 /* process for all: mesh, mlme, ibss */
2504 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2505 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2506 if (is_multicast_ether_addr(mgmt->da) &&
2507 !is_broadcast_ether_addr(mgmt->da))
2508 return RX_DROP_MONITOR;
2510 /* process only for station */
2511 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2512 return RX_DROP_MONITOR;
2514 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2515 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2516 /* process only for ibss */
2517 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2518 return RX_DROP_MONITOR;
2521 return RX_DROP_MONITOR;
2524 /* queue up frame and kick off work to process it */
2525 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2526 skb_queue_tail(&sdata->skb_queue, rx->skb);
2527 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2529 rx->sta->rx_packets++;
2534 /* TODO: use IEEE80211_RX_FRAGMENTED */
2535 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2536 struct ieee80211_rate *rate)
2538 struct ieee80211_sub_if_data *sdata;
2539 struct ieee80211_local *local = rx->local;
2540 struct ieee80211_rtap_hdr {
2541 struct ieee80211_radiotap_header hdr;
2547 struct sk_buff *skb = rx->skb, *skb2;
2548 struct net_device *prev_dev = NULL;
2549 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2552 * If cooked monitor has been processed already, then
2553 * don't do it again. If not, set the flag.
2555 if (rx->flags & IEEE80211_RX_CMNTR)
2557 rx->flags |= IEEE80211_RX_CMNTR;
2559 if (skb_headroom(skb) < sizeof(*rthdr) &&
2560 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2563 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2564 memset(rthdr, 0, sizeof(*rthdr));
2565 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2566 rthdr->hdr.it_present =
2567 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2568 (1 << IEEE80211_RADIOTAP_CHANNEL));
2571 rthdr->rate_or_pad = rate->bitrate / 5;
2572 rthdr->hdr.it_present |=
2573 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2575 rthdr->chan_freq = cpu_to_le16(status->freq);
2577 if (status->band == IEEE80211_BAND_5GHZ)
2578 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2579 IEEE80211_CHAN_5GHZ);
2581 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2582 IEEE80211_CHAN_2GHZ);
2584 skb_set_mac_header(skb, 0);
2585 skb->ip_summed = CHECKSUM_UNNECESSARY;
2586 skb->pkt_type = PACKET_OTHERHOST;
2587 skb->protocol = htons(ETH_P_802_2);
2589 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2590 if (!ieee80211_sdata_running(sdata))
2593 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2594 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2598 skb2 = skb_clone(skb, GFP_ATOMIC);
2600 skb2->dev = prev_dev;
2601 netif_receive_skb(skb2);
2605 prev_dev = sdata->dev;
2606 sdata->dev->stats.rx_packets++;
2607 sdata->dev->stats.rx_bytes += skb->len;
2611 skb->dev = prev_dev;
2612 netif_receive_skb(skb);
2620 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2621 ieee80211_rx_result res)
2624 case RX_DROP_MONITOR:
2625 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2627 rx->sta->rx_dropped++;
2630 struct ieee80211_rate *rate = NULL;
2631 struct ieee80211_supported_band *sband;
2632 struct ieee80211_rx_status *status;
2634 status = IEEE80211_SKB_RXCB((rx->skb));
2636 sband = rx->local->hw.wiphy->bands[status->band];
2637 if (!(status->flag & RX_FLAG_HT))
2638 rate = &sband->bitrates[status->rate_idx];
2640 ieee80211_rx_cooked_monitor(rx, rate);
2643 case RX_DROP_UNUSABLE:
2644 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2646 rx->sta->rx_dropped++;
2647 dev_kfree_skb(rx->skb);
2650 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2655 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2657 ieee80211_rx_result res = RX_DROP_MONITOR;
2658 struct sk_buff *skb;
2660 #define CALL_RXH(rxh) \
2663 if (res != RX_CONTINUE) \
2667 spin_lock(&rx->local->rx_skb_queue.lock);
2668 if (rx->local->running_rx_handler)
2671 rx->local->running_rx_handler = true;
2673 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2674 spin_unlock(&rx->local->rx_skb_queue.lock);
2677 * all the other fields are valid across frames
2678 * that belong to an aMPDU since they are on the
2679 * same TID from the same station
2683 CALL_RXH(ieee80211_rx_h_decrypt)
2684 CALL_RXH(ieee80211_rx_h_check_more_data)
2685 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2686 CALL_RXH(ieee80211_rx_h_sta_process)
2687 CALL_RXH(ieee80211_rx_h_defragment)
2688 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2689 /* must be after MMIC verify so header is counted in MPDU mic */
2690 #ifdef CONFIG_MAC80211_MESH
2691 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2692 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2694 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2695 CALL_RXH(ieee80211_rx_h_amsdu)
2696 CALL_RXH(ieee80211_rx_h_data)
2697 CALL_RXH(ieee80211_rx_h_ctrl);
2698 CALL_RXH(ieee80211_rx_h_mgmt_check)
2699 CALL_RXH(ieee80211_rx_h_action)
2700 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2701 CALL_RXH(ieee80211_rx_h_action_return)
2702 CALL_RXH(ieee80211_rx_h_mgmt)
2705 ieee80211_rx_handlers_result(rx, res);
2706 spin_lock(&rx->local->rx_skb_queue.lock);
2710 rx->local->running_rx_handler = false;
2713 spin_unlock(&rx->local->rx_skb_queue.lock);
2716 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2718 ieee80211_rx_result res = RX_DROP_MONITOR;
2720 #define CALL_RXH(rxh) \
2723 if (res != RX_CONTINUE) \
2727 CALL_RXH(ieee80211_rx_h_passive_scan)
2728 CALL_RXH(ieee80211_rx_h_check)
2730 ieee80211_rx_reorder_ampdu(rx);
2732 ieee80211_rx_handlers(rx);
2736 ieee80211_rx_handlers_result(rx, res);
2742 * This function makes calls into the RX path, therefore
2743 * it has to be invoked under RCU read lock.
2745 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2747 struct ieee80211_rx_data rx = {
2749 .sdata = sta->sdata,
2750 .local = sta->local,
2751 /* This is OK -- must be QoS data frame */
2752 .security_idx = tid,
2756 struct tid_ampdu_rx *tid_agg_rx;
2758 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2762 spin_lock(&tid_agg_rx->reorder_lock);
2763 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2764 spin_unlock(&tid_agg_rx->reorder_lock);
2766 ieee80211_rx_handlers(&rx);
2769 /* main receive path */
2771 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2772 struct ieee80211_hdr *hdr)
2774 struct ieee80211_sub_if_data *sdata = rx->sdata;
2775 struct sk_buff *skb = rx->skb;
2776 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2777 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2778 int multicast = is_multicast_ether_addr(hdr->addr1);
2780 switch (sdata->vif.type) {
2781 case NL80211_IFTYPE_STATION:
2782 if (!bssid && !sdata->u.mgd.use_4addr)
2785 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2786 if (!(sdata->dev->flags & IFF_PROMISC) ||
2787 sdata->u.mgd.use_4addr)
2789 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2792 case NL80211_IFTYPE_ADHOC:
2795 if (compare_ether_addr(sdata->vif.addr, hdr->addr2) == 0 ||
2796 compare_ether_addr(sdata->u.ibss.bssid, hdr->addr2) == 0)
2798 if (ieee80211_is_beacon(hdr->frame_control)) {
2801 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2802 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2804 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2805 } else if (!multicast &&
2806 compare_ether_addr(sdata->vif.addr,
2808 if (!(sdata->dev->flags & IFF_PROMISC))
2810 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2811 } else if (!rx->sta) {
2813 if (status->flag & RX_FLAG_HT)
2814 rate_idx = 0; /* TODO: HT rates */
2816 rate_idx = status->rate_idx;
2817 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2818 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2821 case NL80211_IFTYPE_MESH_POINT:
2823 compare_ether_addr(sdata->vif.addr,
2825 if (!(sdata->dev->flags & IFF_PROMISC))
2828 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2831 case NL80211_IFTYPE_AP_VLAN:
2832 case NL80211_IFTYPE_AP:
2834 if (compare_ether_addr(sdata->vif.addr,
2837 } else if (!ieee80211_bssid_match(bssid,
2839 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2840 !ieee80211_is_beacon(hdr->frame_control) &&
2841 !(ieee80211_is_action(hdr->frame_control) &&
2844 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2847 * 802.11-2016 Table 9-26 says that for data frames,
2848 * A1 must be the BSSID - we've checked that already
2849 * but may have accepted the wildcard
2850 * (ff:ff:ff:ff:ff:ff).
2853 * The BSSID of the Data frame is determined as
2855 * a) If the STA is contained within an AP or is
2856 * associated with an AP, the BSSID is the
2857 * address currently in use by the STA
2858 * contained in the AP.
2860 * So we should not accept data frames with an address
2863 * Accepting it also opens a security problem because
2864 * stations could encrypt it with the GTK and inject
2867 if (ieee80211_is_data(hdr->frame_control) && multicast)
2871 case NL80211_IFTYPE_WDS:
2872 if (bssid || !ieee80211_is_data(hdr->frame_control))
2874 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2878 /* should never get here */
2887 * This function returns whether or not the SKB
2888 * was destined for RX processing or not, which,
2889 * if consume is true, is equivalent to whether
2890 * or not the skb was consumed.
2892 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2893 struct sk_buff *skb, bool consume)
2895 struct ieee80211_local *local = rx->local;
2896 struct ieee80211_sub_if_data *sdata = rx->sdata;
2897 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2898 struct ieee80211_hdr *hdr = (void *)skb->data;
2902 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2903 prepares = prepare_for_handlers(rx, hdr);
2909 skb = skb_copy(skb, GFP_ATOMIC);
2911 if (net_ratelimit())
2912 wiphy_debug(local->hw.wiphy,
2913 "failed to copy skb for %s\n",
2921 ieee80211_invoke_rx_handlers(rx);
2926 * This is the actual Rx frames handler. as it blongs to Rx path it must
2927 * be called with rcu_read_lock protection.
2929 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2930 struct sk_buff *skb)
2932 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2933 struct ieee80211_local *local = hw_to_local(hw);
2934 struct ieee80211_sub_if_data *sdata;
2935 struct ieee80211_hdr *hdr;
2937 struct ieee80211_rx_data rx;
2938 struct ieee80211_sub_if_data *prev;
2939 struct sta_info *sta, *tmp, *prev_sta;
2942 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2943 memset(&rx, 0, sizeof(rx));
2947 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2948 local->dot11ReceivedFragmentCount++;
2950 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2951 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2952 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2954 if (ieee80211_is_mgmt(fc)) {
2955 /* drop frame if too short for header */
2956 if (skb->len < ieee80211_hdrlen(fc))
2959 err = skb_linearize(skb);
2961 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2969 hdr = (struct ieee80211_hdr *)skb->data;
2970 ieee80211_parse_qos(&rx);
2971 ieee80211_verify_alignment(&rx);
2973 if (ieee80211_is_data(fc)) {
2976 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
2983 rx.sdata = prev_sta->sdata;
2984 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2991 rx.sdata = prev_sta->sdata;
2993 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3001 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3002 if (!ieee80211_sdata_running(sdata))
3005 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3006 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3010 * frame is destined for this interface, but if it's
3011 * not also for the previous one we handle that after
3012 * the loop to avoid copying the SKB once too much
3020 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
3022 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3028 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
3031 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3040 * This is the receive path handler. It is called by a low level driver when an
3041 * 802.11 MPDU is received from the hardware.
3043 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3045 struct ieee80211_local *local = hw_to_local(hw);
3046 struct ieee80211_rate *rate = NULL;
3047 struct ieee80211_supported_band *sband;
3048 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3050 WARN_ON_ONCE(softirq_count() == 0);
3052 if (WARN_ON(status->band < 0 ||
3053 status->band >= IEEE80211_NUM_BANDS))
3056 sband = local->hw.wiphy->bands[status->band];
3057 if (WARN_ON(!sband))
3061 * If we're suspending, it is possible although not too likely
3062 * that we'd be receiving frames after having already partially
3063 * quiesced the stack. We can't process such frames then since
3064 * that might, for example, cause stations to be added or other
3065 * driver callbacks be invoked.
3067 if (unlikely(local->quiescing || local->suspended))
3071 * The same happens when we're not even started,
3072 * but that's worth a warning.
3074 if (WARN_ON(!local->started))
3077 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3079 * Validate the rate, unless a PLCP error means that
3080 * we probably can't have a valid rate here anyway.
3083 if (status->flag & RX_FLAG_HT) {
3085 * rate_idx is MCS index, which can be [0-76]
3088 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3090 * Anything else would be some sort of driver or
3091 * hardware error. The driver should catch hardware
3094 if (WARN((status->rate_idx < 0 ||
3095 status->rate_idx > 76),
3096 "Rate marked as an HT rate but passed "
3097 "status->rate_idx is not "
3098 "an MCS index [0-76]: %d (0x%02x)\n",
3103 if (WARN_ON(status->rate_idx < 0 ||
3104 status->rate_idx >= sband->n_bitrates))
3106 rate = &sband->bitrates[status->rate_idx];
3110 status->rx_flags = 0;
3113 * key references and virtual interfaces are protected using RCU
3114 * and this requires that we are in a read-side RCU section during
3115 * receive processing
3120 * Frames with failed FCS/PLCP checksum are not returned,
3121 * all other frames are returned without radiotap header
3122 * if it was previously present.
3123 * Also, frames with less than 16 bytes are dropped.
3125 skb = ieee80211_rx_monitor(local, skb, rate);
3131 ieee80211_tpt_led_trig_rx(local,
3132 ((struct ieee80211_hdr *)skb->data)->frame_control,
3134 __ieee80211_rx_handle_packet(hw, skb);
3142 EXPORT_SYMBOL(ieee80211_rx);
3144 /* This is a version of the rx handler that can be called from hard irq
3145 * context. Post the skb on the queue and schedule the tasklet */
3146 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3148 struct ieee80211_local *local = hw_to_local(hw);
3150 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3152 skb->pkt_type = IEEE80211_RX_MSG;
3153 skb_queue_tail(&local->skb_queue, skb);
3154 tasklet_schedule(&local->tasklet);
3156 EXPORT_SYMBOL(ieee80211_rx_irqsafe);