2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
32 * monitor mode reception
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
37 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
42 __pskb_trim(skb, skb->len - FCS_LEN);
54 static inline int should_drop_frame(struct sk_buff *skb,
57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
62 if (unlikely(skb->len < 16 + present_fcs_len))
64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
72 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
80 if (status->flag & RX_FLAG_TSFT)
82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
85 if (len & 1) /* padding for RX_FLAGS if necessary */
88 if (status->flag & RX_FLAG_HT) /* HT info */
95 * ieee80211_add_rx_radiotap_header - add radiotap header
97 * add a radiotap header containing all the fields which the hardware provided.
100 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
102 struct ieee80211_rate *rate,
105 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
106 struct ieee80211_radiotap_header *rthdr;
110 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
111 memset(rthdr, 0, rtap_len);
113 /* radiotap header, set always present flags */
115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
116 (1 << IEEE80211_RADIOTAP_CHANNEL) |
117 (1 << IEEE80211_RADIOTAP_ANTENNA) |
118 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
119 rthdr->it_len = cpu_to_le16(rtap_len);
121 pos = (unsigned char *)(rthdr+1);
123 /* the order of the following fields is important */
125 /* IEEE80211_RADIOTAP_TSFT */
126 if (status->flag & RX_FLAG_TSFT) {
127 put_unaligned_le64(status->mactime, pos);
129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
133 /* IEEE80211_RADIOTAP_FLAGS */
134 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
135 *pos |= IEEE80211_RADIOTAP_F_FCS;
136 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
137 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
138 if (status->flag & RX_FLAG_SHORTPRE)
139 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
142 /* IEEE80211_RADIOTAP_RATE */
143 if (status->flag & RX_FLAG_HT) {
145 * TODO: add following information into radiotap header once
146 * suitable fields are defined for it:
147 * - MCS index (status->rate_idx)
148 * - HT40 (status->flag & RX_FLAG_40MHZ)
149 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
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->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,
175 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
176 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
177 *pos = status->signal;
179 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
183 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
185 /* IEEE80211_RADIOTAP_ANTENNA */
186 *pos = status->antenna;
189 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
191 /* IEEE80211_RADIOTAP_RX_FLAGS */
192 /* ensure 2 byte alignment for the 2 byte field as required */
193 if ((pos - (u8 *)rthdr) & 1)
195 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
196 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
197 put_unaligned_le16(rx_flags, pos);
200 if (status->flag & RX_FLAG_HT) {
201 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
202 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
203 IEEE80211_RADIOTAP_MCS_HAVE_GI |
204 IEEE80211_RADIOTAP_MCS_HAVE_BW;
206 if (status->flag & RX_FLAG_SHORT_GI)
207 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
208 if (status->flag & RX_FLAG_40MHZ)
209 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
211 *pos++ = status->rate_idx;
216 * This function copies a received frame to all monitor interfaces and
217 * returns a cleaned-up SKB that no longer includes the FCS nor the
218 * radiotap header the driver might have added.
220 static struct sk_buff *
221 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
222 struct ieee80211_rate *rate)
224 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
225 struct ieee80211_sub_if_data *sdata;
226 int needed_headroom = 0;
227 struct sk_buff *skb, *skb2;
228 struct net_device *prev_dev = NULL;
229 int present_fcs_len = 0;
232 * First, we may need to make a copy of the skb because
233 * (1) we need to modify it for radiotap (if not present), and
234 * (2) the other RX handlers will modify the skb we got.
236 * We don't need to, of course, if we aren't going to return
237 * the SKB because it has a bad FCS/PLCP checksum.
240 /* room for the radiotap header based on driver features */
241 needed_headroom = ieee80211_rx_radiotap_len(local, status);
243 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
244 present_fcs_len = FCS_LEN;
246 /* make sure hdr->frame_control is on the linear part */
247 if (!pskb_may_pull(origskb, 2)) {
248 dev_kfree_skb(origskb);
252 if (!local->monitors) {
253 if (should_drop_frame(origskb, present_fcs_len)) {
254 dev_kfree_skb(origskb);
258 return remove_monitor_info(local, origskb);
261 if (should_drop_frame(origskb, present_fcs_len)) {
262 /* only need to expand headroom if necessary */
267 * This shouldn't trigger often because most devices have an
268 * RX header they pull before we get here, and that should
269 * be big enough for our radiotap information. We should
270 * probably export the length to drivers so that we can have
271 * them allocate enough headroom to start with.
273 if (skb_headroom(skb) < needed_headroom &&
274 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
280 * Need to make a copy and possibly remove radiotap header
281 * and FCS from the original.
283 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
285 origskb = remove_monitor_info(local, origskb);
291 /* prepend radiotap information */
292 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
294 skb_reset_mac_header(skb);
295 skb->ip_summed = CHECKSUM_UNNECESSARY;
296 skb->pkt_type = PACKET_OTHERHOST;
297 skb->protocol = htons(ETH_P_802_2);
299 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
300 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
303 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
306 if (!ieee80211_sdata_running(sdata))
310 skb2 = skb_clone(skb, GFP_ATOMIC);
312 skb2->dev = prev_dev;
313 netif_receive_skb(skb2);
317 prev_dev = sdata->dev;
318 sdata->dev->stats.rx_packets++;
319 sdata->dev->stats.rx_bytes += skb->len;
324 netif_receive_skb(skb);
332 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
334 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
335 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
338 /* does the frame have a qos control field? */
339 if (ieee80211_is_data_qos(hdr->frame_control)) {
340 u8 *qc = ieee80211_get_qos_ctl(hdr);
341 /* frame has qos control */
342 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
343 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
344 status->rx_flags |= IEEE80211_RX_AMSDU;
347 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
349 * Sequence numbers for management frames, QoS data
350 * frames with a broadcast/multicast address in the
351 * Address 1 field, and all non-QoS data frames sent
352 * by QoS STAs are assigned using an additional single
353 * modulo-4096 counter, [...]
355 * We also use that counter for non-QoS STAs.
357 tid = NUM_RX_DATA_QUEUES - 1;
361 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
362 * For now, set skb->priority to 0 for other cases. */
363 rx->skb->priority = (tid > 7) ? 0 : tid;
367 * DOC: Packet alignment
369 * Drivers always need to pass packets that are aligned to two-byte boundaries
372 * Additionally, should, if possible, align the payload data in a way that
373 * guarantees that the contained IP header is aligned to a four-byte
374 * boundary. In the case of regular frames, this simply means aligning the
375 * payload to a four-byte boundary (because either the IP header is directly
376 * contained, or IV/RFC1042 headers that have a length divisible by four are
377 * in front of it). If the payload data is not properly aligned and the
378 * architecture doesn't support efficient unaligned operations, mac80211
379 * will align the data.
381 * With A-MSDU frames, however, the payload data address must yield two modulo
382 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
383 * push the IP header further back to a multiple of four again. Thankfully, the
384 * specs were sane enough this time around to require padding each A-MSDU
385 * subframe to a length that is a multiple of four.
387 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
388 * the payload is not supported, the driver is required to move the 802.11
389 * header to be directly in front of the payload in that case.
391 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
393 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
394 WARN_ONCE((unsigned long)rx->skb->data & 1,
395 "unaligned packet at 0x%p\n", rx->skb->data);
402 static ieee80211_rx_result debug_noinline
403 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
405 struct ieee80211_local *local = rx->local;
406 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
407 struct sk_buff *skb = rx->skb;
409 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
412 if (test_bit(SCAN_HW_SCANNING, &local->scanning))
413 return ieee80211_scan_rx(rx->sdata, skb);
415 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
416 /* drop all the other packets during a software scan anyway */
417 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
422 /* scanning finished during invoking of handlers */
423 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
424 return RX_DROP_UNUSABLE;
428 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
430 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
432 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
435 return ieee80211_is_robust_mgmt_frame(hdr);
439 static int ieee80211_is_multicast_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 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
451 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
453 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
454 struct ieee80211_mmie *mmie;
456 if (skb->len < 24 + sizeof(*mmie) ||
457 !is_multicast_ether_addr(hdr->da))
460 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
461 return -1; /* not a robust management frame */
463 mmie = (struct ieee80211_mmie *)
464 (skb->data + skb->len - sizeof(*mmie));
465 if (mmie->element_id != WLAN_EID_MMIE ||
466 mmie->length != sizeof(*mmie) - 2)
469 return le16_to_cpu(mmie->key_id);
473 static ieee80211_rx_result
474 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
476 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
477 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
478 char *dev_addr = rx->sdata->vif.addr;
480 if (ieee80211_is_data(hdr->frame_control)) {
481 if (is_multicast_ether_addr(hdr->addr1)) {
482 if (ieee80211_has_tods(hdr->frame_control) ||
483 !ieee80211_has_fromds(hdr->frame_control))
484 return RX_DROP_MONITOR;
485 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
486 return RX_DROP_MONITOR;
488 if (!ieee80211_has_a4(hdr->frame_control))
489 return RX_DROP_MONITOR;
490 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
491 return RX_DROP_MONITOR;
495 /* If there is not an established peer link and this is not a peer link
496 * establisment frame, beacon or probe, drop the frame.
499 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
500 struct ieee80211_mgmt *mgmt;
502 if (!ieee80211_is_mgmt(hdr->frame_control))
503 return RX_DROP_MONITOR;
505 if (ieee80211_is_action(hdr->frame_control)) {
506 mgmt = (struct ieee80211_mgmt *)hdr;
507 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
508 return RX_DROP_MONITOR;
512 if (ieee80211_is_probe_req(hdr->frame_control) ||
513 ieee80211_is_probe_resp(hdr->frame_control) ||
514 ieee80211_is_beacon(hdr->frame_control))
517 return RX_DROP_MONITOR;
521 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
523 if (ieee80211_is_data(hdr->frame_control) &&
524 is_multicast_ether_addr(hdr->addr1) &&
525 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
526 return RX_DROP_MONITOR;
532 #define SEQ_MODULO 0x1000
533 #define SEQ_MASK 0xfff
535 static inline int seq_less(u16 sq1, u16 sq2)
537 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
540 static inline u16 seq_inc(u16 sq)
542 return (sq + 1) & SEQ_MASK;
545 static inline u16 seq_sub(u16 sq1, u16 sq2)
547 return (sq1 - sq2) & SEQ_MASK;
551 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
552 struct tid_ampdu_rx *tid_agg_rx,
555 struct ieee80211_local *local = hw_to_local(hw);
556 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
557 struct ieee80211_rx_status *status;
559 lockdep_assert_held(&tid_agg_rx->reorder_lock);
564 /* release the frame from the reorder ring buffer */
565 tid_agg_rx->stored_mpdu_num--;
566 tid_agg_rx->reorder_buf[index] = NULL;
567 status = IEEE80211_SKB_RXCB(skb);
568 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
569 skb_queue_tail(&local->rx_skb_queue, skb);
572 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
575 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
576 struct tid_ampdu_rx *tid_agg_rx,
581 lockdep_assert_held(&tid_agg_rx->reorder_lock);
583 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
584 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
585 tid_agg_rx->buf_size;
586 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
591 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
592 * the skb was added to the buffer longer than this time ago, the earlier
593 * frames that have not yet been received are assumed to be lost and the skb
594 * can be released for processing. This may also release other skb's from the
595 * reorder buffer if there are no additional gaps between the frames.
597 * Callers must hold tid_agg_rx->reorder_lock.
599 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
601 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
602 struct tid_ampdu_rx *tid_agg_rx)
606 lockdep_assert_held(&tid_agg_rx->reorder_lock);
608 /* release the buffer until next missing frame */
609 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
610 tid_agg_rx->buf_size;
611 if (!tid_agg_rx->reorder_buf[index] &&
612 tid_agg_rx->stored_mpdu_num > 1) {
614 * No buffers ready to be released, but check whether any
615 * frames in the reorder buffer have timed out.
618 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
619 j = (j + 1) % tid_agg_rx->buf_size) {
620 if (!tid_agg_rx->reorder_buf[j]) {
624 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
625 HT_RX_REORDER_BUF_TIMEOUT))
626 goto set_release_timer;
628 #ifdef CONFIG_MAC80211_HT_DEBUG
630 wiphy_debug(hw->wiphy,
631 "release an RX reorder frame due to timeout on earlier frames\n");
633 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
636 * Increment the head seq# also for the skipped slots.
638 tid_agg_rx->head_seq_num =
639 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
642 } else while (tid_agg_rx->reorder_buf[index]) {
643 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
644 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
645 tid_agg_rx->buf_size;
648 if (tid_agg_rx->stored_mpdu_num) {
649 j = index = seq_sub(tid_agg_rx->head_seq_num,
650 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
652 for (; j != (index - 1) % tid_agg_rx->buf_size;
653 j = (j + 1) % tid_agg_rx->buf_size) {
654 if (tid_agg_rx->reorder_buf[j])
660 mod_timer(&tid_agg_rx->reorder_timer,
661 tid_agg_rx->reorder_time[j] +
662 HT_RX_REORDER_BUF_TIMEOUT);
664 del_timer(&tid_agg_rx->reorder_timer);
669 * As this function belongs to the RX path it must be under
670 * rcu_read_lock protection. It returns false if the frame
671 * can be processed immediately, true if it was consumed.
673 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
674 struct tid_ampdu_rx *tid_agg_rx,
677 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
678 u16 sc = le16_to_cpu(hdr->seq_ctrl);
679 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
680 u16 head_seq_num, buf_size;
684 spin_lock(&tid_agg_rx->reorder_lock);
686 buf_size = tid_agg_rx->buf_size;
687 head_seq_num = tid_agg_rx->head_seq_num;
689 /* frame with out of date sequence number */
690 if (seq_less(mpdu_seq_num, head_seq_num)) {
696 * If frame the sequence number exceeds our buffering window
697 * size release some previous frames to make room for this one.
699 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
700 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
701 /* release stored frames up to new head to stack */
702 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
705 /* Now the new frame is always in the range of the reordering buffer */
707 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
709 /* check if we already stored this frame */
710 if (tid_agg_rx->reorder_buf[index]) {
716 * If the current MPDU is in the right order and nothing else
717 * is stored we can process it directly, no need to buffer it.
719 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
720 tid_agg_rx->stored_mpdu_num == 0) {
721 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
726 /* put the frame in the reordering buffer */
727 tid_agg_rx->reorder_buf[index] = skb;
728 tid_agg_rx->reorder_time[index] = jiffies;
729 tid_agg_rx->stored_mpdu_num++;
730 ieee80211_sta_reorder_release(hw, tid_agg_rx);
733 spin_unlock(&tid_agg_rx->reorder_lock);
738 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
739 * true if the MPDU was buffered, false if it should be processed.
741 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
743 struct sk_buff *skb = rx->skb;
744 struct ieee80211_local *local = rx->local;
745 struct ieee80211_hw *hw = &local->hw;
746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
747 struct sta_info *sta = rx->sta;
748 struct tid_ampdu_rx *tid_agg_rx;
752 if (!ieee80211_is_data_qos(hdr->frame_control))
756 * filter the QoS data rx stream according to
757 * STA/TID and check if this STA/TID is on aggregation
763 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
765 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
769 /* qos null data frames are excluded */
770 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
773 /* new, potentially un-ordered, ampdu frame - process it */
775 /* reset session timer */
776 if (tid_agg_rx->timeout)
777 mod_timer(&tid_agg_rx->session_timer,
778 TU_TO_EXP_TIME(tid_agg_rx->timeout));
780 /* if this mpdu is fragmented - terminate rx aggregation session */
781 sc = le16_to_cpu(hdr->seq_ctrl);
782 if (sc & IEEE80211_SCTL_FRAG) {
783 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
784 skb_queue_tail(&rx->sdata->skb_queue, skb);
785 ieee80211_queue_work(&local->hw, &rx->sdata->work);
790 * No locking needed -- we will only ever process one
791 * RX packet at a time, and thus own tid_agg_rx. All
792 * other code manipulating it needs to (and does) make
793 * sure that we cannot get to it any more before doing
796 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
800 skb_queue_tail(&local->rx_skb_queue, skb);
803 static ieee80211_rx_result debug_noinline
804 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
806 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
807 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
809 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
810 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
811 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
812 rx->sta->last_seq_ctrl[rx->queue] ==
814 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
815 rx->local->dot11FrameDuplicateCount++;
816 rx->sta->num_duplicates++;
818 return RX_DROP_MONITOR;
820 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
823 if (unlikely(rx->skb->len < 16)) {
824 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
825 return RX_DROP_MONITOR;
828 /* Drop disallowed frame classes based on STA auth/assoc state;
829 * IEEE 802.11, Chap 5.5.
831 * mac80211 filters only based on association state, i.e. it drops
832 * Class 3 frames from not associated stations. hostapd sends
833 * deauth/disassoc frames when needed. In addition, hostapd is
834 * responsible for filtering on both auth and assoc states.
837 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
838 return ieee80211_rx_mesh_check(rx);
840 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
841 ieee80211_is_pspoll(hdr->frame_control)) &&
842 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
843 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
844 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
845 if ((!ieee80211_has_fromds(hdr->frame_control) &&
846 !ieee80211_has_tods(hdr->frame_control) &&
847 ieee80211_is_data(hdr->frame_control)) ||
848 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
849 /* Drop IBSS frames and frames for other hosts
851 return RX_DROP_MONITOR;
854 return RX_DROP_MONITOR;
861 static ieee80211_rx_result debug_noinline
862 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
864 struct sk_buff *skb = rx->skb;
865 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
866 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
869 ieee80211_rx_result result = RX_DROP_UNUSABLE;
870 struct ieee80211_key *sta_ptk = NULL;
871 int mmie_keyidx = -1;
877 * There are four types of keys:
879 * - IGTK (group keys for management frames)
880 * - PTK (pairwise keys)
881 * - STK (station-to-station pairwise keys)
883 * When selecting a key, we have to distinguish between multicast
884 * (including broadcast) and unicast frames, the latter can only
885 * use PTKs and STKs while the former always use GTKs and IGTKs.
886 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
887 * unicast frames can also use key indices like GTKs. Hence, if we
888 * don't have a PTK/STK we check the key index for a WEP key.
890 * Note that in a regular BSS, multicast frames are sent by the
891 * AP only, associated stations unicast the frame to the AP first
892 * which then multicasts it on their behalf.
894 * There is also a slight problem in IBSS mode: GTKs are negotiated
895 * with each station, that is something we don't currently handle.
896 * The spec seems to expect that one negotiates the same key with
897 * every station but there's no such requirement; VLANs could be
902 * No point in finding a key and decrypting if the frame is neither
903 * addressed to us nor a multicast frame.
905 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
908 /* start without a key */
912 sta_ptk = rcu_dereference(rx->sta->ptk);
914 fc = hdr->frame_control;
916 if (!ieee80211_has_protected(fc))
917 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
919 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
921 if ((status->flag & RX_FLAG_DECRYPTED) &&
922 (status->flag & RX_FLAG_IV_STRIPPED))
924 /* Skip decryption if the frame is not protected. */
925 if (!ieee80211_has_protected(fc))
927 } else if (mmie_keyidx >= 0) {
928 /* Broadcast/multicast robust management frame / BIP */
929 if ((status->flag & RX_FLAG_DECRYPTED) &&
930 (status->flag & RX_FLAG_IV_STRIPPED))
933 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
934 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
935 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
937 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
939 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
940 } else if (!ieee80211_has_protected(fc)) {
942 * The frame was not protected, so skip decryption. However, we
943 * need to set rx->key if there is a key that could have been
944 * used so that the frame may be dropped if encryption would
945 * have been expected.
947 struct ieee80211_key *key = NULL;
948 struct ieee80211_sub_if_data *sdata = rx->sdata;
951 if (ieee80211_is_mgmt(fc) &&
952 is_multicast_ether_addr(hdr->addr1) &&
953 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
957 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
958 key = rcu_dereference(rx->sta->gtk[i]);
964 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
965 key = rcu_dereference(sdata->keys[i]);
977 * The device doesn't give us the IV so we won't be
978 * able to look up the key. That's ok though, we
979 * don't need to decrypt the frame, we just won't
980 * be able to keep statistics accurate.
981 * Except for key threshold notifications, should
982 * we somehow allow the driver to tell us which key
983 * the hardware used if this flag is set?
985 if ((status->flag & RX_FLAG_DECRYPTED) &&
986 (status->flag & RX_FLAG_IV_STRIPPED))
989 hdrlen = ieee80211_hdrlen(fc);
991 if (rx->skb->len < 8 + hdrlen)
992 return RX_DROP_UNUSABLE; /* TODO: count this? */
995 * no need to call ieee80211_wep_get_keyidx,
996 * it verifies a bunch of things we've done already
998 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1001 /* check per-station GTK first, if multicast packet */
1002 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1003 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1005 /* if not found, try default key */
1007 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1010 * RSNA-protected unicast frames should always be
1011 * sent with pairwise or station-to-station keys,
1012 * but for WEP we allow using a key index as well.
1015 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1016 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1017 !is_multicast_ether_addr(hdr->addr1))
1023 rx->key->tx_rx_count++;
1024 /* TODO: add threshold stuff again */
1026 return RX_DROP_MONITOR;
1029 if (skb_linearize(rx->skb))
1030 return RX_DROP_UNUSABLE;
1031 /* the hdr variable is invalid now! */
1033 switch (rx->key->conf.cipher) {
1034 case WLAN_CIPHER_SUITE_WEP40:
1035 case WLAN_CIPHER_SUITE_WEP104:
1036 /* Check for weak IVs if possible */
1037 if (rx->sta && ieee80211_is_data(fc) &&
1038 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1039 !(status->flag & RX_FLAG_DECRYPTED)) &&
1040 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1041 rx->sta->wep_weak_iv_count++;
1043 result = ieee80211_crypto_wep_decrypt(rx);
1045 case WLAN_CIPHER_SUITE_TKIP:
1046 result = ieee80211_crypto_tkip_decrypt(rx);
1048 case WLAN_CIPHER_SUITE_CCMP:
1049 result = ieee80211_crypto_ccmp_decrypt(rx);
1051 case WLAN_CIPHER_SUITE_AES_CMAC:
1052 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1056 * We can reach here only with HW-only algorithms
1057 * but why didn't it decrypt the frame?!
1059 return RX_DROP_UNUSABLE;
1062 /* either the frame has been decrypted or will be dropped */
1063 status->flag |= RX_FLAG_DECRYPTED;
1068 static ieee80211_rx_result debug_noinline
1069 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1071 struct ieee80211_local *local;
1072 struct ieee80211_hdr *hdr;
1073 struct sk_buff *skb;
1077 hdr = (struct ieee80211_hdr *) skb->data;
1079 if (!local->pspolling)
1082 if (!ieee80211_has_fromds(hdr->frame_control))
1083 /* this is not from AP */
1086 if (!ieee80211_is_data(hdr->frame_control))
1089 if (!ieee80211_has_moredata(hdr->frame_control)) {
1090 /* AP has no more frames buffered for us */
1091 local->pspolling = false;
1095 /* more data bit is set, let's request a new frame from the AP */
1096 ieee80211_send_pspoll(local, rx->sdata);
1101 static void ap_sta_ps_start(struct sta_info *sta)
1103 struct ieee80211_sub_if_data *sdata = sta->sdata;
1104 struct ieee80211_local *local = sdata->local;
1106 atomic_inc(&sdata->bss->num_sta_ps);
1107 set_sta_flags(sta, WLAN_STA_PS_STA);
1108 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1109 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1110 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1111 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1112 sdata->name, sta->sta.addr, sta->sta.aid);
1113 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1116 static void ap_sta_ps_end(struct sta_info *sta)
1118 struct ieee80211_sub_if_data *sdata = sta->sdata;
1120 atomic_dec(&sdata->bss->num_sta_ps);
1122 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1123 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1124 sdata->name, sta->sta.addr, sta->sta.aid);
1125 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1127 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
1128 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1129 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1130 sdata->name, sta->sta.addr, sta->sta.aid);
1131 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1135 ieee80211_sta_ps_deliver_wakeup(sta);
1138 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1140 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1143 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1145 /* Don't let the same PS state be set twice */
1146 in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA);
1147 if ((start && in_ps) || (!start && !in_ps))
1151 ap_sta_ps_start(sta_inf);
1153 ap_sta_ps_end(sta_inf);
1157 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1159 static ieee80211_rx_result debug_noinline
1160 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1162 struct sta_info *sta = rx->sta;
1163 struct sk_buff *skb = rx->skb;
1164 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1165 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1171 * Update last_rx only for IBSS packets which are for the current
1172 * BSSID to avoid keeping the current IBSS network alive in cases
1173 * where other STAs start using different BSSID.
1175 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1176 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1177 NL80211_IFTYPE_ADHOC);
1178 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
1179 sta->last_rx = jiffies;
1180 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1182 * Mesh beacons will update last_rx when if they are found to
1183 * match the current local configuration when processed.
1185 sta->last_rx = jiffies;
1188 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1191 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1192 ieee80211_sta_rx_notify(rx->sdata, hdr);
1194 sta->rx_fragments++;
1195 sta->rx_bytes += rx->skb->len;
1196 sta->last_signal = status->signal;
1197 ewma_add(&sta->avg_signal, -status->signal);
1200 * Change STA power saving mode only at the end of a frame
1201 * exchange sequence.
1203 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1204 !ieee80211_has_morefrags(hdr->frame_control) &&
1205 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1206 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1207 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1208 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
1210 * Ignore doze->wake transitions that are
1211 * indicated by non-data frames, the standard
1212 * is unclear here, but for example going to
1213 * PS mode and then scanning would cause a
1214 * doze->wake transition for the probe request,
1215 * and that is clearly undesirable.
1217 if (ieee80211_is_data(hdr->frame_control) &&
1218 !ieee80211_has_pm(hdr->frame_control))
1221 if (ieee80211_has_pm(hdr->frame_control))
1222 ap_sta_ps_start(sta);
1227 * Drop (qos-)data::nullfunc frames silently, since they
1228 * are used only to control station power saving mode.
1230 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1231 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1232 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1235 * If we receive a 4-addr nullfunc frame from a STA
1236 * that was not moved to a 4-addr STA vlan yet, drop
1237 * the frame to the monitor interface, to make sure
1238 * that hostapd sees it
1240 if (ieee80211_has_a4(hdr->frame_control) &&
1241 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1242 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1243 !rx->sdata->u.vlan.sta)))
1244 return RX_DROP_MONITOR;
1246 * Update counter and free packet here to avoid
1247 * counting this as a dropped packed.
1250 dev_kfree_skb(rx->skb);
1255 } /* ieee80211_rx_h_sta_process */
1257 static inline struct ieee80211_fragment_entry *
1258 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1259 unsigned int frag, unsigned int seq, int rx_queue,
1260 struct sk_buff **skb)
1262 struct ieee80211_fragment_entry *entry;
1265 idx = sdata->fragment_next;
1266 entry = &sdata->fragments[sdata->fragment_next++];
1267 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1268 sdata->fragment_next = 0;
1270 if (!skb_queue_empty(&entry->skb_list)) {
1271 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1272 struct ieee80211_hdr *hdr =
1273 (struct ieee80211_hdr *) entry->skb_list.next->data;
1274 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1275 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1276 "addr1=%pM addr2=%pM\n",
1278 jiffies - entry->first_frag_time, entry->seq,
1279 entry->last_frag, hdr->addr1, hdr->addr2);
1281 __skb_queue_purge(&entry->skb_list);
1284 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1286 entry->first_frag_time = jiffies;
1288 entry->rx_queue = rx_queue;
1289 entry->last_frag = frag;
1291 entry->extra_len = 0;
1296 static inline struct ieee80211_fragment_entry *
1297 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1298 unsigned int frag, unsigned int seq,
1299 int rx_queue, struct ieee80211_hdr *hdr)
1301 struct ieee80211_fragment_entry *entry;
1304 idx = sdata->fragment_next;
1305 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1306 struct ieee80211_hdr *f_hdr;
1310 idx = IEEE80211_FRAGMENT_MAX - 1;
1312 entry = &sdata->fragments[idx];
1313 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1314 entry->rx_queue != rx_queue ||
1315 entry->last_frag + 1 != frag)
1318 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1321 * Check ftype and addresses are equal, else check next fragment
1323 if (((hdr->frame_control ^ f_hdr->frame_control) &
1324 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1325 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1326 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1329 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1330 __skb_queue_purge(&entry->skb_list);
1339 static ieee80211_rx_result debug_noinline
1340 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1342 struct ieee80211_hdr *hdr;
1345 unsigned int frag, seq;
1346 struct ieee80211_fragment_entry *entry;
1347 struct sk_buff *skb;
1348 struct ieee80211_rx_status *status;
1350 hdr = (struct ieee80211_hdr *)rx->skb->data;
1351 fc = hdr->frame_control;
1352 sc = le16_to_cpu(hdr->seq_ctrl);
1353 frag = sc & IEEE80211_SCTL_FRAG;
1355 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1356 (rx->skb)->len < 24 ||
1357 is_multicast_ether_addr(hdr->addr1))) {
1358 /* not fragmented */
1361 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1363 if (skb_linearize(rx->skb))
1364 return RX_DROP_UNUSABLE;
1367 * skb_linearize() might change the skb->data and
1368 * previously cached variables (in this case, hdr) need to
1369 * be refreshed with the new data.
1371 hdr = (struct ieee80211_hdr *)rx->skb->data;
1372 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1375 /* This is the first fragment of a new frame. */
1376 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1377 rx->queue, &(rx->skb));
1378 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1379 ieee80211_has_protected(fc)) {
1380 int queue = ieee80211_is_mgmt(fc) ?
1381 NUM_RX_DATA_QUEUES : rx->queue;
1382 /* Store CCMP PN so that we can verify that the next
1383 * fragment has a sequential PN value. */
1385 memcpy(entry->last_pn,
1386 rx->key->u.ccmp.rx_pn[queue],
1392 /* This is a fragment for a frame that should already be pending in
1393 * fragment cache. Add this fragment to the end of the pending entry.
1395 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1397 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1398 return RX_DROP_MONITOR;
1401 /* Verify that MPDUs within one MSDU have sequential PN values.
1402 * (IEEE 802.11i, 8.3.3.4.5) */
1405 u8 pn[CCMP_PN_LEN], *rpn;
1407 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1408 return RX_DROP_UNUSABLE;
1409 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1410 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1415 queue = ieee80211_is_mgmt(fc) ?
1416 NUM_RX_DATA_QUEUES : rx->queue;
1417 rpn = rx->key->u.ccmp.rx_pn[queue];
1418 if (memcmp(pn, rpn, CCMP_PN_LEN))
1419 return RX_DROP_UNUSABLE;
1420 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1423 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1424 __skb_queue_tail(&entry->skb_list, rx->skb);
1425 entry->last_frag = frag;
1426 entry->extra_len += rx->skb->len;
1427 if (ieee80211_has_morefrags(fc)) {
1432 rx->skb = __skb_dequeue(&entry->skb_list);
1433 if (skb_tailroom(rx->skb) < entry->extra_len) {
1434 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1435 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1437 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1438 __skb_queue_purge(&entry->skb_list);
1439 return RX_DROP_UNUSABLE;
1442 while ((skb = __skb_dequeue(&entry->skb_list))) {
1443 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1447 /* Complete frame has been reassembled - process it now */
1448 status = IEEE80211_SKB_RXCB(rx->skb);
1449 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1453 rx->sta->rx_packets++;
1454 if (is_multicast_ether_addr(hdr->addr1))
1455 rx->local->dot11MulticastReceivedFrameCount++;
1457 ieee80211_led_rx(rx->local);
1461 static ieee80211_rx_result debug_noinline
1462 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1464 struct ieee80211_sub_if_data *sdata = rx->sdata;
1465 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1466 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1468 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1469 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
1472 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1473 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1474 return RX_DROP_UNUSABLE;
1476 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1477 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1479 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1481 /* Free PS Poll skb here instead of returning RX_DROP that would
1482 * count as an dropped frame. */
1483 dev_kfree_skb(rx->skb);
1488 static ieee80211_rx_result debug_noinline
1489 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1491 u8 *data = rx->skb->data;
1492 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1494 if (!ieee80211_is_data_qos(hdr->frame_control))
1497 /* remove the qos control field, update frame type and meta-data */
1498 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1499 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1500 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1501 /* change frame type to non QOS */
1502 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1508 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1510 if (unlikely(!rx->sta ||
1511 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1518 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1520 struct sk_buff *skb = rx->skb;
1521 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1524 * Pass through unencrypted frames if the hardware has
1525 * decrypted them already.
1527 if (status->flag & RX_FLAG_DECRYPTED)
1530 /* Drop unencrypted frames if key is set. */
1531 if (unlikely(!ieee80211_has_protected(fc) &&
1532 !ieee80211_is_nullfunc(fc) &&
1533 ieee80211_is_data(fc) &&
1534 (rx->key || rx->sdata->drop_unencrypted)))
1541 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1543 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1544 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1545 __le16 fc = hdr->frame_control;
1548 * Pass through unencrypted frames if the hardware has
1549 * decrypted them already.
1551 if (status->flag & RX_FLAG_DECRYPTED)
1554 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1555 if (unlikely(!ieee80211_has_protected(fc) &&
1556 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1558 if (ieee80211_is_deauth(fc))
1559 cfg80211_send_unprot_deauth(rx->sdata->dev,
1562 else if (ieee80211_is_disassoc(fc))
1563 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1568 /* BIP does not use Protected field, so need to check MMIE */
1569 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1570 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1571 if (ieee80211_is_deauth(fc))
1572 cfg80211_send_unprot_deauth(rx->sdata->dev,
1575 else if (ieee80211_is_disassoc(fc))
1576 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1582 * When using MFP, Action frames are not allowed prior to
1583 * having configured keys.
1585 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1586 ieee80211_is_robust_mgmt_frame(
1587 (struct ieee80211_hdr *) rx->skb->data)))
1595 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1597 struct ieee80211_sub_if_data *sdata = rx->sdata;
1598 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1599 bool check_port_control = false;
1600 struct ethhdr *ehdr;
1603 if (ieee80211_has_a4(hdr->frame_control) &&
1604 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1607 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1608 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1610 if (!sdata->u.mgd.use_4addr)
1613 check_port_control = true;
1616 if (is_multicast_ether_addr(hdr->addr1) &&
1617 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1620 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1621 if (ret < 0 || !check_port_control)
1624 ehdr = (struct ethhdr *) rx->skb->data;
1625 if (ehdr->h_proto != rx->sdata->control_port_protocol)
1632 * requires that rx->skb is a frame with ethernet header
1634 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1636 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1637 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1638 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1641 * Allow EAPOL frames to us/the PAE group address regardless
1642 * of whether the frame was encrypted or not.
1644 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1645 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1646 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1649 if (ieee80211_802_1x_port_control(rx) ||
1650 ieee80211_drop_unencrypted(rx, fc))
1657 * requires that rx->skb is a frame with ethernet header
1660 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1662 struct ieee80211_sub_if_data *sdata = rx->sdata;
1663 struct net_device *dev = sdata->dev;
1664 struct sk_buff *skb, *xmit_skb;
1665 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1666 struct sta_info *dsta;
1667 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1672 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1673 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1674 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1675 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1676 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1677 if (is_multicast_ether_addr(ehdr->h_dest)) {
1679 * send multicast frames both to higher layers in
1680 * local net stack and back to the wireless medium
1682 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1683 if (!xmit_skb && net_ratelimit())
1684 printk(KERN_DEBUG "%s: failed to clone "
1685 "multicast frame\n", dev->name);
1687 dsta = sta_info_get(sdata, skb->data);
1690 * The destination station is associated to
1691 * this AP (in this VLAN), so send the frame
1692 * directly to it and do not pass it to local
1702 int align __maybe_unused;
1704 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1706 * 'align' will only take the values 0 or 2 here
1707 * since all frames are required to be aligned
1708 * to 2-byte boundaries when being passed to
1709 * mac80211. That also explains the __skb_push()
1712 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1714 if (WARN_ON(skb_headroom(skb) < 3)) {
1718 u8 *data = skb->data;
1719 size_t len = skb_headlen(skb);
1721 memmove(skb->data, data, len);
1722 skb_set_tail_pointer(skb, len);
1728 /* deliver to local stack */
1729 skb->protocol = eth_type_trans(skb, dev);
1730 memset(skb->cb, 0, sizeof(skb->cb));
1731 netif_receive_skb(skb);
1736 /* send to wireless media */
1737 xmit_skb->protocol = htons(ETH_P_802_3);
1738 skb_reset_network_header(xmit_skb);
1739 skb_reset_mac_header(xmit_skb);
1740 dev_queue_xmit(xmit_skb);
1744 static ieee80211_rx_result debug_noinline
1745 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1747 struct net_device *dev = rx->sdata->dev;
1748 struct sk_buff *skb = rx->skb;
1749 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1750 __le16 fc = hdr->frame_control;
1751 struct sk_buff_head frame_list;
1752 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1754 if (unlikely(!ieee80211_is_data(fc)))
1757 if (unlikely(!ieee80211_is_data_present(fc)))
1758 return RX_DROP_MONITOR;
1760 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1763 if (ieee80211_has_a4(hdr->frame_control) &&
1764 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1765 !rx->sdata->u.vlan.sta)
1766 return RX_DROP_UNUSABLE;
1768 if (is_multicast_ether_addr(hdr->addr1) &&
1769 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1770 rx->sdata->u.vlan.sta) ||
1771 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1772 rx->sdata->u.mgd.use_4addr)))
1773 return RX_DROP_UNUSABLE;
1776 __skb_queue_head_init(&frame_list);
1778 if (skb_linearize(skb))
1779 return RX_DROP_UNUSABLE;
1781 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1782 rx->sdata->vif.type,
1783 rx->local->hw.extra_tx_headroom);
1785 while (!skb_queue_empty(&frame_list)) {
1786 rx->skb = __skb_dequeue(&frame_list);
1788 if (!ieee80211_frame_allowed(rx, fc)) {
1789 dev_kfree_skb(rx->skb);
1792 dev->stats.rx_packets++;
1793 dev->stats.rx_bytes += rx->skb->len;
1795 ieee80211_deliver_skb(rx);
1801 #ifdef CONFIG_MAC80211_MESH
1802 static ieee80211_rx_result
1803 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1805 struct ieee80211_hdr *hdr;
1806 struct ieee80211s_hdr *mesh_hdr;
1807 unsigned int hdrlen;
1808 struct sk_buff *skb = rx->skb, *fwd_skb;
1809 struct ieee80211_local *local = rx->local;
1810 struct ieee80211_sub_if_data *sdata = rx->sdata;
1811 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1813 hdr = (struct ieee80211_hdr *) skb->data;
1814 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1815 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1817 if (!ieee80211_is_data(hdr->frame_control))
1822 return RX_DROP_MONITOR;
1824 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1825 struct mesh_path *mppath;
1829 if (is_multicast_ether_addr(hdr->addr1)) {
1830 mpp_addr = hdr->addr3;
1831 proxied_addr = mesh_hdr->eaddr1;
1833 mpp_addr = hdr->addr4;
1834 proxied_addr = mesh_hdr->eaddr2;
1838 mppath = mpp_path_lookup(proxied_addr, sdata);
1840 mpp_path_add(proxied_addr, mpp_addr, sdata);
1842 spin_lock_bh(&mppath->state_lock);
1843 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1844 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1845 spin_unlock_bh(&mppath->state_lock);
1850 /* Frame has reached destination. Don't forward */
1851 if (!is_multicast_ether_addr(hdr->addr1) &&
1852 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1857 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1859 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1860 dropped_frames_ttl);
1862 struct ieee80211_hdr *fwd_hdr;
1863 struct ieee80211_tx_info *info;
1865 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1867 if (!fwd_skb && net_ratelimit())
1868 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1873 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1874 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1875 info = IEEE80211_SKB_CB(fwd_skb);
1876 memset(info, 0, sizeof(*info));
1877 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1878 info->control.vif = &rx->sdata->vif;
1879 skb_set_queue_mapping(skb,
1880 ieee80211_select_queue(rx->sdata, fwd_skb));
1881 ieee80211_set_qos_hdr(local, skb);
1882 if (is_multicast_ether_addr(fwd_hdr->addr1))
1883 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1888 * Save TA to addr1 to send TA a path error if a
1889 * suitable next hop is not found
1891 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1893 err = mesh_nexthop_lookup(fwd_skb, sdata);
1894 /* Failed to immediately resolve next hop:
1895 * fwded frame was dropped or will be added
1896 * later to the pending skb queue. */
1898 return RX_DROP_MONITOR;
1900 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1903 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1905 ieee80211_add_pending_skb(local, fwd_skb);
1910 if (is_multicast_ether_addr(hdr->addr1) ||
1911 sdata->dev->flags & IFF_PROMISC)
1914 return RX_DROP_MONITOR;
1918 static ieee80211_rx_result debug_noinline
1919 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1921 struct ieee80211_sub_if_data *sdata = rx->sdata;
1922 struct ieee80211_local *local = rx->local;
1923 struct net_device *dev = sdata->dev;
1924 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1925 __le16 fc = hdr->frame_control;
1928 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1931 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1932 return RX_DROP_MONITOR;
1935 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1936 * that a 4-addr station can be detected and moved into a separate VLAN
1938 if (ieee80211_has_a4(hdr->frame_control) &&
1939 sdata->vif.type == NL80211_IFTYPE_AP)
1940 return RX_DROP_MONITOR;
1942 err = __ieee80211_data_to_8023(rx);
1944 return RX_DROP_UNUSABLE;
1946 if (!ieee80211_frame_allowed(rx, fc))
1947 return RX_DROP_MONITOR;
1951 dev->stats.rx_packets++;
1952 dev->stats.rx_bytes += rx->skb->len;
1954 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
1955 !is_multicast_ether_addr(
1956 ((struct ethhdr *)rx->skb->data)->h_dest) &&
1957 (!local->scanning &&
1958 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
1959 mod_timer(&local->dynamic_ps_timer, jiffies +
1960 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1963 ieee80211_deliver_skb(rx);
1968 static ieee80211_rx_result debug_noinline
1969 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1971 struct ieee80211_local *local = rx->local;
1972 struct ieee80211_hw *hw = &local->hw;
1973 struct sk_buff *skb = rx->skb;
1974 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1975 struct tid_ampdu_rx *tid_agg_rx;
1979 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1982 if (ieee80211_is_back_req(bar->frame_control)) {
1984 __le16 control, start_seq_num;
1985 } __packed bar_data;
1988 return RX_DROP_MONITOR;
1990 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1991 &bar_data, sizeof(bar_data)))
1992 return RX_DROP_MONITOR;
1994 tid = le16_to_cpu(bar_data.control) >> 12;
1996 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1998 return RX_DROP_MONITOR;
2000 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2002 /* reset session timer */
2003 if (tid_agg_rx->timeout)
2004 mod_timer(&tid_agg_rx->session_timer,
2005 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2007 spin_lock(&tid_agg_rx->reorder_lock);
2008 /* release stored frames up to start of BAR */
2009 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2010 spin_unlock(&tid_agg_rx->reorder_lock);
2017 * After this point, we only want management frames,
2018 * so we can drop all remaining control frames to
2019 * cooked monitor interfaces.
2021 return RX_DROP_MONITOR;
2024 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2025 struct ieee80211_mgmt *mgmt,
2028 struct ieee80211_local *local = sdata->local;
2029 struct sk_buff *skb;
2030 struct ieee80211_mgmt *resp;
2032 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2033 /* Not to own unicast address */
2037 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2038 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2039 /* Not from the current AP or not associated yet. */
2043 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2044 /* Too short SA Query request frame */
2048 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2052 skb_reserve(skb, local->hw.extra_tx_headroom);
2053 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2054 memset(resp, 0, 24);
2055 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2056 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2057 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2058 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2059 IEEE80211_STYPE_ACTION);
2060 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2061 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2062 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2063 memcpy(resp->u.action.u.sa_query.trans_id,
2064 mgmt->u.action.u.sa_query.trans_id,
2065 WLAN_SA_QUERY_TR_ID_LEN);
2067 ieee80211_tx_skb(sdata, skb);
2070 static ieee80211_rx_result debug_noinline
2071 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2073 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2074 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2077 * From here on, look only at management frames.
2078 * Data and control frames are already handled,
2079 * and unknown (reserved) frames are useless.
2081 if (rx->skb->len < 24)
2082 return RX_DROP_MONITOR;
2084 if (!ieee80211_is_mgmt(mgmt->frame_control))
2085 return RX_DROP_MONITOR;
2087 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2088 return RX_DROP_MONITOR;
2090 if (ieee80211_drop_unencrypted_mgmt(rx))
2091 return RX_DROP_UNUSABLE;
2096 static ieee80211_rx_result debug_noinline
2097 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2099 struct ieee80211_local *local = rx->local;
2100 struct ieee80211_sub_if_data *sdata = rx->sdata;
2101 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2103 int len = rx->skb->len;
2105 if (!ieee80211_is_action(mgmt->frame_control))
2108 /* drop too small frames */
2109 if (len < IEEE80211_MIN_ACTION_SIZE)
2110 return RX_DROP_UNUSABLE;
2112 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2113 return RX_DROP_UNUSABLE;
2115 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2116 return RX_DROP_UNUSABLE;
2118 switch (mgmt->u.action.category) {
2119 case WLAN_CATEGORY_BACK:
2121 * The aggregation code is not prepared to handle
2122 * anything but STA/AP due to the BSSID handling;
2123 * IBSS could work in the code but isn't supported
2124 * by drivers or the standard.
2126 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2127 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2128 sdata->vif.type != NL80211_IFTYPE_AP)
2131 /* verify action_code is present */
2132 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2135 switch (mgmt->u.action.u.addba_req.action_code) {
2136 case WLAN_ACTION_ADDBA_REQ:
2137 if (len < (IEEE80211_MIN_ACTION_SIZE +
2138 sizeof(mgmt->u.action.u.addba_req)))
2141 case WLAN_ACTION_ADDBA_RESP:
2142 if (len < (IEEE80211_MIN_ACTION_SIZE +
2143 sizeof(mgmt->u.action.u.addba_resp)))
2146 case WLAN_ACTION_DELBA:
2147 if (len < (IEEE80211_MIN_ACTION_SIZE +
2148 sizeof(mgmt->u.action.u.delba)))
2156 case WLAN_CATEGORY_SPECTRUM_MGMT:
2157 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2160 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2163 /* verify action_code is present */
2164 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2167 switch (mgmt->u.action.u.measurement.action_code) {
2168 case WLAN_ACTION_SPCT_MSR_REQ:
2169 if (len < (IEEE80211_MIN_ACTION_SIZE +
2170 sizeof(mgmt->u.action.u.measurement)))
2172 ieee80211_process_measurement_req(sdata, mgmt, len);
2174 case WLAN_ACTION_SPCT_CHL_SWITCH:
2175 if (len < (IEEE80211_MIN_ACTION_SIZE +
2176 sizeof(mgmt->u.action.u.chan_switch)))
2179 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2182 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2188 case WLAN_CATEGORY_SA_QUERY:
2189 if (len < (IEEE80211_MIN_ACTION_SIZE +
2190 sizeof(mgmt->u.action.u.sa_query)))
2193 switch (mgmt->u.action.u.sa_query.action) {
2194 case WLAN_ACTION_SA_QUERY_REQUEST:
2195 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2197 ieee80211_process_sa_query_req(sdata, mgmt, len);
2201 case WLAN_CATEGORY_MESH_PLINK:
2202 if (!ieee80211_vif_is_mesh(&sdata->vif))
2205 case WLAN_CATEGORY_MESH_PATH_SEL:
2206 if (!mesh_path_sel_is_hwmp(sdata))
2214 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2215 /* will return in the next handlers */
2220 rx->sta->rx_packets++;
2221 dev_kfree_skb(rx->skb);
2225 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2226 skb_queue_tail(&sdata->skb_queue, rx->skb);
2227 ieee80211_queue_work(&local->hw, &sdata->work);
2229 rx->sta->rx_packets++;
2233 static ieee80211_rx_result debug_noinline
2234 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2236 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2238 /* skip known-bad action frames and return them in the next handler */
2239 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2243 * Getting here means the kernel doesn't know how to handle
2244 * it, but maybe userspace does ... include returned frames
2245 * so userspace can register for those to know whether ones
2246 * it transmitted were processed or returned.
2249 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2250 rx->skb->data, rx->skb->len,
2253 rx->sta->rx_packets++;
2254 dev_kfree_skb(rx->skb);
2262 static ieee80211_rx_result debug_noinline
2263 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2265 struct ieee80211_local *local = rx->local;
2266 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2267 struct sk_buff *nskb;
2268 struct ieee80211_sub_if_data *sdata = rx->sdata;
2269 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2271 if (!ieee80211_is_action(mgmt->frame_control))
2275 * For AP mode, hostapd is responsible for handling any action
2276 * frames that we didn't handle, including returning unknown
2277 * ones. For all other modes we will return them to the sender,
2278 * setting the 0x80 bit in the action category, as required by
2279 * 802.11-2007 7.3.1.11.
2280 * Newer versions of hostapd shall also use the management frame
2281 * registration mechanisms, but older ones still use cooked
2282 * monitor interfaces so push all frames there.
2284 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2285 (sdata->vif.type == NL80211_IFTYPE_AP ||
2286 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2287 return RX_DROP_MONITOR;
2289 /* do not return rejected action frames */
2290 if (mgmt->u.action.category & 0x80)
2291 return RX_DROP_UNUSABLE;
2293 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2296 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2298 nmgmt->u.action.category |= 0x80;
2299 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2300 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2302 memset(nskb->cb, 0, sizeof(nskb->cb));
2304 ieee80211_tx_skb(rx->sdata, nskb);
2306 dev_kfree_skb(rx->skb);
2310 static ieee80211_rx_result debug_noinline
2311 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2313 struct ieee80211_sub_if_data *sdata = rx->sdata;
2314 ieee80211_rx_result rxs;
2315 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2318 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2319 if (rxs != RX_CONTINUE)
2322 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2324 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2325 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2326 sdata->vif.type != NL80211_IFTYPE_STATION)
2327 return RX_DROP_MONITOR;
2330 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2331 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2332 /* process for all: mesh, mlme, ibss */
2334 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2335 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2336 if (is_multicast_ether_addr(mgmt->da) &&
2337 !is_broadcast_ether_addr(mgmt->da))
2338 return RX_DROP_MONITOR;
2340 /* process only for station */
2341 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2342 return RX_DROP_MONITOR;
2344 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2345 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2346 /* process only for ibss */
2347 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2348 return RX_DROP_MONITOR;
2351 return RX_DROP_MONITOR;
2354 /* queue up frame and kick off work to process it */
2355 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2356 skb_queue_tail(&sdata->skb_queue, rx->skb);
2357 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2359 rx->sta->rx_packets++;
2364 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
2365 struct ieee80211_rx_data *rx)
2368 unsigned int hdrlen;
2370 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2371 if (rx->skb->len >= hdrlen + 4)
2372 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2378 * Some hardware seem to generate incorrect Michael MIC
2379 * reports; ignore them to avoid triggering countermeasures.
2384 if (!ieee80211_has_protected(hdr->frame_control))
2387 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
2389 * APs with pairwise keys should never receive Michael MIC
2390 * errors for non-zero keyidx because these are reserved for
2391 * group keys and only the AP is sending real multicast
2392 * frames in the BSS.
2397 if (!ieee80211_is_data(hdr->frame_control) &&
2398 !ieee80211_is_auth(hdr->frame_control))
2401 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2405 /* TODO: use IEEE80211_RX_FRAGMENTED */
2406 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2407 struct ieee80211_rate *rate)
2409 struct ieee80211_sub_if_data *sdata;
2410 struct ieee80211_local *local = rx->local;
2411 struct ieee80211_rtap_hdr {
2412 struct ieee80211_radiotap_header hdr;
2418 struct sk_buff *skb = rx->skb, *skb2;
2419 struct net_device *prev_dev = NULL;
2420 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2423 * If cooked monitor has been processed already, then
2424 * don't do it again. If not, set the flag.
2426 if (rx->flags & IEEE80211_RX_CMNTR)
2428 rx->flags |= IEEE80211_RX_CMNTR;
2430 if (skb_headroom(skb) < sizeof(*rthdr) &&
2431 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2434 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2435 memset(rthdr, 0, sizeof(*rthdr));
2436 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2437 rthdr->hdr.it_present =
2438 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2439 (1 << IEEE80211_RADIOTAP_CHANNEL));
2442 rthdr->rate_or_pad = rate->bitrate / 5;
2443 rthdr->hdr.it_present |=
2444 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2446 rthdr->chan_freq = cpu_to_le16(status->freq);
2448 if (status->band == IEEE80211_BAND_5GHZ)
2449 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2450 IEEE80211_CHAN_5GHZ);
2452 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2453 IEEE80211_CHAN_2GHZ);
2455 skb_set_mac_header(skb, 0);
2456 skb->ip_summed = CHECKSUM_UNNECESSARY;
2457 skb->pkt_type = PACKET_OTHERHOST;
2458 skb->protocol = htons(ETH_P_802_2);
2460 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2461 if (!ieee80211_sdata_running(sdata))
2464 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2465 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2469 skb2 = skb_clone(skb, GFP_ATOMIC);
2471 skb2->dev = prev_dev;
2472 netif_receive_skb(skb2);
2476 prev_dev = sdata->dev;
2477 sdata->dev->stats.rx_packets++;
2478 sdata->dev->stats.rx_bytes += skb->len;
2482 skb->dev = prev_dev;
2483 netif_receive_skb(skb);
2491 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2492 ieee80211_rx_result res)
2495 case RX_DROP_MONITOR:
2496 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2498 rx->sta->rx_dropped++;
2501 struct ieee80211_rate *rate = NULL;
2502 struct ieee80211_supported_band *sband;
2503 struct ieee80211_rx_status *status;
2505 status = IEEE80211_SKB_RXCB((rx->skb));
2507 sband = rx->local->hw.wiphy->bands[status->band];
2508 if (!(status->flag & RX_FLAG_HT))
2509 rate = &sband->bitrates[status->rate_idx];
2511 ieee80211_rx_cooked_monitor(rx, rate);
2514 case RX_DROP_UNUSABLE:
2515 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2517 rx->sta->rx_dropped++;
2518 dev_kfree_skb(rx->skb);
2521 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2526 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2528 ieee80211_rx_result res = RX_DROP_MONITOR;
2529 struct sk_buff *skb;
2531 #define CALL_RXH(rxh) \
2534 if (res != RX_CONTINUE) \
2538 spin_lock(&rx->local->rx_skb_queue.lock);
2539 if (rx->local->running_rx_handler)
2542 rx->local->running_rx_handler = true;
2544 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2545 spin_unlock(&rx->local->rx_skb_queue.lock);
2548 * all the other fields are valid across frames
2549 * that belong to an aMPDU since they are on the
2550 * same TID from the same station
2555 CALL_RXH(ieee80211_rx_h_decrypt)
2556 CALL_RXH(ieee80211_rx_h_check_more_data)
2557 CALL_RXH(ieee80211_rx_h_sta_process)
2558 CALL_RXH(ieee80211_rx_h_defragment)
2559 CALL_RXH(ieee80211_rx_h_ps_poll)
2560 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2561 /* must be after MMIC verify so header is counted in MPDU mic */
2562 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2563 CALL_RXH(ieee80211_rx_h_amsdu)
2564 #ifdef CONFIG_MAC80211_MESH
2565 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2566 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2568 CALL_RXH(ieee80211_rx_h_data)
2569 CALL_RXH(ieee80211_rx_h_ctrl);
2570 CALL_RXH(ieee80211_rx_h_mgmt_check)
2571 CALL_RXH(ieee80211_rx_h_action)
2572 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2573 CALL_RXH(ieee80211_rx_h_action_return)
2574 CALL_RXH(ieee80211_rx_h_mgmt)
2577 ieee80211_rx_handlers_result(rx, res);
2578 spin_lock(&rx->local->rx_skb_queue.lock);
2582 rx->local->running_rx_handler = false;
2585 spin_unlock(&rx->local->rx_skb_queue.lock);
2588 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2590 ieee80211_rx_result res = RX_DROP_MONITOR;
2592 #define CALL_RXH(rxh) \
2595 if (res != RX_CONTINUE) \
2599 CALL_RXH(ieee80211_rx_h_passive_scan)
2600 CALL_RXH(ieee80211_rx_h_check)
2602 ieee80211_rx_reorder_ampdu(rx);
2604 ieee80211_rx_handlers(rx);
2608 ieee80211_rx_handlers_result(rx, res);
2614 * This function makes calls into the RX path, therefore
2615 * it has to be invoked under RCU read lock.
2617 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2619 struct ieee80211_rx_data rx = {
2621 .sdata = sta->sdata,
2622 .local = sta->local,
2625 struct tid_ampdu_rx *tid_agg_rx;
2627 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2631 spin_lock(&tid_agg_rx->reorder_lock);
2632 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2633 spin_unlock(&tid_agg_rx->reorder_lock);
2635 ieee80211_rx_handlers(&rx);
2638 /* main receive path */
2640 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2641 struct ieee80211_hdr *hdr)
2643 struct ieee80211_sub_if_data *sdata = rx->sdata;
2644 struct sk_buff *skb = rx->skb;
2645 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2646 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2647 int multicast = is_multicast_ether_addr(hdr->addr1);
2649 switch (sdata->vif.type) {
2650 case NL80211_IFTYPE_STATION:
2651 if (!bssid && !sdata->u.mgd.use_4addr)
2654 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2655 if (!(sdata->dev->flags & IFF_PROMISC))
2657 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2660 case NL80211_IFTYPE_ADHOC:
2663 if (ieee80211_is_beacon(hdr->frame_control)) {
2666 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2667 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2669 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2670 } else if (!multicast &&
2671 compare_ether_addr(sdata->vif.addr,
2673 if (!(sdata->dev->flags & IFF_PROMISC))
2675 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2676 } else if (!rx->sta) {
2678 if (status->flag & RX_FLAG_HT)
2679 rate_idx = 0; /* TODO: HT rates */
2681 rate_idx = status->rate_idx;
2682 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2683 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2686 case NL80211_IFTYPE_MESH_POINT:
2688 compare_ether_addr(sdata->vif.addr,
2690 if (!(sdata->dev->flags & IFF_PROMISC))
2693 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2696 case NL80211_IFTYPE_AP_VLAN:
2697 case NL80211_IFTYPE_AP:
2699 if (compare_ether_addr(sdata->vif.addr,
2702 } else if (!ieee80211_bssid_match(bssid,
2704 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2705 !ieee80211_is_beacon(hdr->frame_control))
2707 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2710 case NL80211_IFTYPE_WDS:
2711 if (bssid || !ieee80211_is_data(hdr->frame_control))
2713 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2717 /* should never get here */
2726 * This function returns whether or not the SKB
2727 * was destined for RX processing or not, which,
2728 * if consume is true, is equivalent to whether
2729 * or not the skb was consumed.
2731 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2732 struct sk_buff *skb, bool consume)
2734 struct ieee80211_local *local = rx->local;
2735 struct ieee80211_sub_if_data *sdata = rx->sdata;
2736 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2737 struct ieee80211_hdr *hdr = (void *)skb->data;
2741 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2742 prepares = prepare_for_handlers(rx, hdr);
2747 if (status->flag & RX_FLAG_MMIC_ERROR) {
2748 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
2749 ieee80211_rx_michael_mic_report(hdr, rx);
2754 skb = skb_copy(skb, GFP_ATOMIC);
2756 if (net_ratelimit())
2757 wiphy_debug(local->hw.wiphy,
2758 "failed to copy skb for %s\n",
2766 ieee80211_invoke_rx_handlers(rx);
2771 * This is the actual Rx frames handler. as it blongs to Rx path it must
2772 * be called with rcu_read_lock protection.
2774 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2775 struct sk_buff *skb)
2777 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2778 struct ieee80211_local *local = hw_to_local(hw);
2779 struct ieee80211_sub_if_data *sdata;
2780 struct ieee80211_hdr *hdr;
2782 struct ieee80211_rx_data rx;
2783 struct ieee80211_sub_if_data *prev;
2784 struct sta_info *sta, *tmp, *prev_sta;
2787 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2788 memset(&rx, 0, sizeof(rx));
2792 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2793 local->dot11ReceivedFragmentCount++;
2795 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2796 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2797 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2799 if (ieee80211_is_mgmt(fc))
2800 err = skb_linearize(skb);
2802 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2809 hdr = (struct ieee80211_hdr *)skb->data;
2810 ieee80211_parse_qos(&rx);
2811 ieee80211_verify_alignment(&rx);
2813 if (ieee80211_is_data(fc)) {
2816 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2823 rx.sdata = prev_sta->sdata;
2824 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2831 rx.sdata = prev_sta->sdata;
2833 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2841 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2842 if (!ieee80211_sdata_running(sdata))
2845 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2846 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2850 * frame is destined for this interface, but if it's
2851 * not also for the previous one we handle that after
2852 * the loop to avoid copying the SKB once too much
2860 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2862 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2868 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2871 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2880 * This is the receive path handler. It is called by a low level driver when an
2881 * 802.11 MPDU is received from the hardware.
2883 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2885 struct ieee80211_local *local = hw_to_local(hw);
2886 struct ieee80211_rate *rate = NULL;
2887 struct ieee80211_supported_band *sband;
2888 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2890 WARN_ON_ONCE(softirq_count() == 0);
2892 if (WARN_ON(status->band < 0 ||
2893 status->band >= IEEE80211_NUM_BANDS))
2896 sband = local->hw.wiphy->bands[status->band];
2897 if (WARN_ON(!sband))
2901 * If we're suspending, it is possible although not too likely
2902 * that we'd be receiving frames after having already partially
2903 * quiesced the stack. We can't process such frames then since
2904 * that might, for example, cause stations to be added or other
2905 * driver callbacks be invoked.
2907 if (unlikely(local->quiescing || local->suspended))
2911 * The same happens when we're not even started,
2912 * but that's worth a warning.
2914 if (WARN_ON(!local->started))
2917 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
2919 * Validate the rate, unless a PLCP error means that
2920 * we probably can't have a valid rate here anyway.
2923 if (status->flag & RX_FLAG_HT) {
2925 * rate_idx is MCS index, which can be [0-76]
2928 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2930 * Anything else would be some sort of driver or
2931 * hardware error. The driver should catch hardware
2934 if (WARN((status->rate_idx < 0 ||
2935 status->rate_idx > 76),
2936 "Rate marked as an HT rate but passed "
2937 "status->rate_idx is not "
2938 "an MCS index [0-76]: %d (0x%02x)\n",
2943 if (WARN_ON(status->rate_idx < 0 ||
2944 status->rate_idx >= sband->n_bitrates))
2946 rate = &sband->bitrates[status->rate_idx];
2950 status->rx_flags = 0;
2953 * key references and virtual interfaces are protected using RCU
2954 * and this requires that we are in a read-side RCU section during
2955 * receive processing
2960 * Frames with failed FCS/PLCP checksum are not returned,
2961 * all other frames are returned without radiotap header
2962 * if it was previously present.
2963 * Also, frames with less than 16 bytes are dropped.
2965 skb = ieee80211_rx_monitor(local, skb, rate);
2971 ieee80211_tpt_led_trig_rx(local,
2972 ((struct ieee80211_hdr *)skb->data)->frame_control,
2974 __ieee80211_rx_handle_packet(hw, skb);
2982 EXPORT_SYMBOL(ieee80211_rx);
2984 /* This is a version of the rx handler that can be called from hard irq
2985 * context. Post the skb on the queue and schedule the tasklet */
2986 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2988 struct ieee80211_local *local = hw_to_local(hw);
2990 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2992 skb->pkt_type = IEEE80211_RX_MSG;
2993 skb_queue_tail(&local->skb_queue, skb);
2994 tasklet_schedule(&local->tasklet);
2996 EXPORT_SYMBOL(ieee80211_rx_irqsafe);