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 mod_timer(&tid_agg_rx->reorder_timer,
674 tid_agg_rx->reorder_time[j] + 1 +
675 HT_RX_REORDER_BUF_TIMEOUT);
677 del_timer(&tid_agg_rx->reorder_timer);
682 * As this function belongs to the RX path it must be under
683 * rcu_read_lock protection. It returns false if the frame
684 * can be processed immediately, true if it was consumed.
686 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
687 struct tid_ampdu_rx *tid_agg_rx,
690 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
691 u16 sc = le16_to_cpu(hdr->seq_ctrl);
692 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
693 u16 head_seq_num, buf_size;
697 spin_lock(&tid_agg_rx->reorder_lock);
699 buf_size = tid_agg_rx->buf_size;
700 head_seq_num = tid_agg_rx->head_seq_num;
702 /* frame with out of date sequence number */
703 if (seq_less(mpdu_seq_num, head_seq_num)) {
709 * If frame the sequence number exceeds our buffering window
710 * size release some previous frames to make room for this one.
712 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
713 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
714 /* release stored frames up to new head to stack */
715 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
718 /* Now the new frame is always in the range of the reordering buffer */
720 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
722 /* check if we already stored this frame */
723 if (tid_agg_rx->reorder_buf[index]) {
729 * If the current MPDU is in the right order and nothing else
730 * is stored we can process it directly, no need to buffer it.
731 * If it is first but there's something stored, we may be able
732 * to release frames after this one.
734 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
735 tid_agg_rx->stored_mpdu_num == 0) {
736 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
741 /* put the frame in the reordering buffer */
742 tid_agg_rx->reorder_buf[index] = skb;
743 tid_agg_rx->reorder_time[index] = jiffies;
744 tid_agg_rx->stored_mpdu_num++;
745 ieee80211_sta_reorder_release(hw, tid_agg_rx);
748 spin_unlock(&tid_agg_rx->reorder_lock);
753 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
754 * true if the MPDU was buffered, false if it should be processed.
756 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
758 struct sk_buff *skb = rx->skb;
759 struct ieee80211_local *local = rx->local;
760 struct ieee80211_hw *hw = &local->hw;
761 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
762 struct sta_info *sta = rx->sta;
763 struct tid_ampdu_rx *tid_agg_rx;
767 if (!ieee80211_is_data_qos(hdr->frame_control))
771 * filter the QoS data rx stream according to
772 * STA/TID and check if this STA/TID is on aggregation
778 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
780 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
784 /* qos null data frames are excluded */
785 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
788 /* new, potentially un-ordered, ampdu frame - process it */
790 /* reset session timer */
791 if (tid_agg_rx->timeout)
792 mod_timer(&tid_agg_rx->session_timer,
793 TU_TO_EXP_TIME(tid_agg_rx->timeout));
795 /* if this mpdu is fragmented - terminate rx aggregation session */
796 sc = le16_to_cpu(hdr->seq_ctrl);
797 if (sc & IEEE80211_SCTL_FRAG) {
798 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
799 skb_queue_tail(&rx->sdata->skb_queue, skb);
800 ieee80211_queue_work(&local->hw, &rx->sdata->work);
805 * No locking needed -- we will only ever process one
806 * RX packet at a time, and thus own tid_agg_rx. All
807 * other code manipulating it needs to (and does) make
808 * sure that we cannot get to it any more before doing
811 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
815 skb_queue_tail(&local->rx_skb_queue, skb);
818 static ieee80211_rx_result debug_noinline
819 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
821 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
822 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
824 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
825 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
826 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
827 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
829 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
830 rx->local->dot11FrameDuplicateCount++;
831 rx->sta->num_duplicates++;
833 return RX_DROP_UNUSABLE;
835 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
838 if (unlikely(rx->skb->len < 16)) {
839 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
840 return RX_DROP_MONITOR;
843 /* Drop disallowed frame classes based on STA auth/assoc state;
844 * IEEE 802.11, Chap 5.5.
846 * mac80211 filters only based on association state, i.e. it drops
847 * Class 3 frames from not associated stations. hostapd sends
848 * deauth/disassoc frames when needed. In addition, hostapd is
849 * responsible for filtering on both auth and assoc states.
852 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
853 return ieee80211_rx_mesh_check(rx);
855 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
856 ieee80211_is_pspoll(hdr->frame_control)) &&
857 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
858 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
859 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
860 if (rx->sta && rx->sta->dummy &&
861 ieee80211_is_data_present(hdr->frame_control)) {
865 hdrlen = ieee80211_hdrlen(hdr->frame_control);
867 if (rx->skb->len < hdrlen + 8)
868 return RX_DROP_MONITOR;
870 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
871 if (ethertype == rx->sdata->control_port_protocol)
874 return RX_DROP_MONITOR;
881 static ieee80211_rx_result debug_noinline
882 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
884 struct sk_buff *skb = rx->skb;
885 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
886 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
889 ieee80211_rx_result result = RX_DROP_UNUSABLE;
890 struct ieee80211_key *sta_ptk = NULL;
891 int mmie_keyidx = -1;
897 * There are four types of keys:
899 * - IGTK (group keys for management frames)
900 * - PTK (pairwise keys)
901 * - STK (station-to-station pairwise keys)
903 * When selecting a key, we have to distinguish between multicast
904 * (including broadcast) and unicast frames, the latter can only
905 * use PTKs and STKs while the former always use GTKs and IGTKs.
906 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
907 * unicast frames can also use key indices like GTKs. Hence, if we
908 * don't have a PTK/STK we check the key index for a WEP key.
910 * Note that in a regular BSS, multicast frames are sent by the
911 * AP only, associated stations unicast the frame to the AP first
912 * which then multicasts it on their behalf.
914 * There is also a slight problem in IBSS mode: GTKs are negotiated
915 * with each station, that is something we don't currently handle.
916 * The spec seems to expect that one negotiates the same key with
917 * every station but there's no such requirement; VLANs could be
922 * No point in finding a key and decrypting if the frame is neither
923 * addressed to us nor a multicast frame.
925 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
928 /* start without a key */
932 sta_ptk = rcu_dereference(rx->sta->ptk);
934 fc = hdr->frame_control;
936 if (!ieee80211_has_protected(fc))
937 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
939 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
941 if ((status->flag & RX_FLAG_DECRYPTED) &&
942 (status->flag & RX_FLAG_IV_STRIPPED))
944 /* Skip decryption if the frame is not protected. */
945 if (!ieee80211_has_protected(fc))
947 } else if (mmie_keyidx >= 0) {
948 /* Broadcast/multicast robust management frame / BIP */
949 if ((status->flag & RX_FLAG_DECRYPTED) &&
950 (status->flag & RX_FLAG_IV_STRIPPED))
953 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
954 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
955 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
957 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
959 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
960 } else if (!ieee80211_has_protected(fc)) {
962 * The frame was not protected, so skip decryption. However, we
963 * need to set rx->key if there is a key that could have been
964 * used so that the frame may be dropped if encryption would
965 * have been expected.
967 struct ieee80211_key *key = NULL;
968 struct ieee80211_sub_if_data *sdata = rx->sdata;
971 if (ieee80211_is_mgmt(fc) &&
972 is_multicast_ether_addr(hdr->addr1) &&
973 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
977 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
978 key = rcu_dereference(rx->sta->gtk[i]);
984 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
985 key = rcu_dereference(sdata->keys[i]);
997 * The device doesn't give us the IV so we won't be
998 * able to look up the key. That's ok though, we
999 * don't need to decrypt the frame, we just won't
1000 * be able to keep statistics accurate.
1001 * Except for key threshold notifications, should
1002 * we somehow allow the driver to tell us which key
1003 * the hardware used if this flag is set?
1005 if ((status->flag & RX_FLAG_DECRYPTED) &&
1006 (status->flag & RX_FLAG_IV_STRIPPED))
1009 hdrlen = ieee80211_hdrlen(fc);
1011 if (rx->skb->len < 8 + hdrlen)
1012 return RX_DROP_UNUSABLE; /* TODO: count this? */
1015 * no need to call ieee80211_wep_get_keyidx,
1016 * it verifies a bunch of things we've done already
1018 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1019 keyidx = keyid >> 6;
1021 /* check per-station GTK first, if multicast packet */
1022 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1023 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1025 /* if not found, try default key */
1027 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1030 * RSNA-protected unicast frames should always be
1031 * sent with pairwise or station-to-station keys,
1032 * but for WEP we allow using a key index as well.
1035 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1036 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1037 !is_multicast_ether_addr(hdr->addr1))
1043 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1044 return RX_DROP_MONITOR;
1046 rx->key->tx_rx_count++;
1047 /* TODO: add threshold stuff again */
1049 return RX_DROP_MONITOR;
1052 if (skb_linearize(rx->skb))
1053 return RX_DROP_UNUSABLE;
1054 /* the hdr variable is invalid now! */
1056 switch (rx->key->conf.cipher) {
1057 case WLAN_CIPHER_SUITE_WEP40:
1058 case WLAN_CIPHER_SUITE_WEP104:
1059 /* Check for weak IVs if possible */
1060 if (rx->sta && ieee80211_is_data(fc) &&
1061 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1062 !(status->flag & RX_FLAG_DECRYPTED)) &&
1063 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1064 rx->sta->wep_weak_iv_count++;
1066 result = ieee80211_crypto_wep_decrypt(rx);
1068 case WLAN_CIPHER_SUITE_TKIP:
1069 result = ieee80211_crypto_tkip_decrypt(rx);
1071 case WLAN_CIPHER_SUITE_CCMP:
1072 result = ieee80211_crypto_ccmp_decrypt(rx);
1074 case WLAN_CIPHER_SUITE_AES_CMAC:
1075 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1079 * We can reach here only with HW-only algorithms
1080 * but why didn't it decrypt the frame?!
1082 return RX_DROP_UNUSABLE;
1085 /* either the frame has been decrypted or will be dropped */
1086 status->flag |= RX_FLAG_DECRYPTED;
1091 static ieee80211_rx_result debug_noinline
1092 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1094 struct ieee80211_local *local;
1095 struct ieee80211_hdr *hdr;
1096 struct sk_buff *skb;
1100 hdr = (struct ieee80211_hdr *) skb->data;
1102 if (!local->pspolling)
1105 if (!ieee80211_has_fromds(hdr->frame_control))
1106 /* this is not from AP */
1109 if (!ieee80211_is_data(hdr->frame_control))
1112 if (!ieee80211_has_moredata(hdr->frame_control)) {
1113 /* AP has no more frames buffered for us */
1114 local->pspolling = false;
1118 /* more data bit is set, let's request a new frame from the AP */
1119 ieee80211_send_pspoll(local, rx->sdata);
1124 static void ap_sta_ps_start(struct sta_info *sta)
1126 struct ieee80211_sub_if_data *sdata = sta->sdata;
1127 struct ieee80211_local *local = sdata->local;
1129 atomic_inc(&sdata->bss->num_sta_ps);
1130 set_sta_flag(sta, WLAN_STA_PS_STA);
1131 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1132 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1133 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1134 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1135 sdata->name, sta->sta.addr, sta->sta.aid);
1136 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1139 static void ap_sta_ps_end(struct sta_info *sta)
1141 struct ieee80211_sub_if_data *sdata = sta->sdata;
1143 atomic_dec(&sdata->bss->num_sta_ps);
1145 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1146 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1147 sdata->name, sta->sta.addr, sta->sta.aid);
1148 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1150 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1151 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1152 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1153 sdata->name, sta->sta.addr, sta->sta.aid);
1154 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1158 ieee80211_sta_ps_deliver_wakeup(sta);
1161 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1163 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1166 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1168 /* Don't let the same PS state be set twice */
1169 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1170 if ((start && in_ps) || (!start && !in_ps))
1174 ap_sta_ps_start(sta_inf);
1176 ap_sta_ps_end(sta_inf);
1180 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1182 static ieee80211_rx_result debug_noinline
1183 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1185 struct ieee80211_sub_if_data *sdata = rx->sdata;
1186 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1187 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1190 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1193 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1194 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1198 * The device handles station powersave, so don't do anything about
1199 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1200 * it to mac80211 since they're handled.)
1202 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1206 * Don't do anything if the station isn't already asleep. In
1207 * the uAPSD case, the station will probably be marked asleep,
1208 * in the PS-Poll case the station must be confused ...
1210 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1213 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1214 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1215 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1216 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1218 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1221 /* Free PS Poll skb here instead of returning RX_DROP that would
1222 * count as an dropped frame. */
1223 dev_kfree_skb(rx->skb);
1226 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1227 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1228 ieee80211_has_pm(hdr->frame_control) &&
1229 (ieee80211_is_data_qos(hdr->frame_control) ||
1230 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1231 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1232 ac = ieee802_1d_to_ac[tid & 7];
1235 * If this AC is not trigger-enabled do nothing.
1237 * NB: This could/should check a separate bitmap of trigger-
1238 * enabled queues, but for now we only implement uAPSD w/o
1239 * TSPEC changes to the ACs, so they're always the same.
1241 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1244 /* if we are in a service period, do nothing */
1245 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1248 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1249 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1251 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1257 static ieee80211_rx_result debug_noinline
1258 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1260 struct sta_info *sta = rx->sta;
1261 struct sk_buff *skb = rx->skb;
1262 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1263 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1269 * Update last_rx only for IBSS packets which are for the current
1270 * BSSID to avoid keeping the current IBSS network alive in cases
1271 * where other STAs start using different BSSID.
1273 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1274 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1275 NL80211_IFTYPE_ADHOC);
1276 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
1277 sta->last_rx = jiffies;
1278 if (ieee80211_is_data(hdr->frame_control)) {
1279 sta->last_rx_rate_idx = status->rate_idx;
1280 sta->last_rx_rate_flag = status->flag;
1283 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1285 * Mesh beacons will update last_rx when if they are found to
1286 * match the current local configuration when processed.
1288 sta->last_rx = jiffies;
1289 if (ieee80211_is_data(hdr->frame_control)) {
1290 sta->last_rx_rate_idx = status->rate_idx;
1291 sta->last_rx_rate_flag = status->flag;
1295 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1298 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1299 ieee80211_sta_rx_notify(rx->sdata, hdr);
1301 sta->rx_fragments++;
1302 sta->rx_bytes += rx->skb->len;
1303 sta->last_signal = status->signal;
1304 ewma_add(&sta->avg_signal, -status->signal);
1307 * Change STA power saving mode only at the end of a frame
1308 * exchange sequence.
1310 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1311 !ieee80211_has_morefrags(hdr->frame_control) &&
1312 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1313 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1314 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1315 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1317 * Ignore doze->wake transitions that are
1318 * indicated by non-data frames, the standard
1319 * is unclear here, but for example going to
1320 * PS mode and then scanning would cause a
1321 * doze->wake transition for the probe request,
1322 * and that is clearly undesirable.
1324 if (ieee80211_is_data(hdr->frame_control) &&
1325 !ieee80211_has_pm(hdr->frame_control))
1328 if (ieee80211_has_pm(hdr->frame_control))
1329 ap_sta_ps_start(sta);
1334 * Drop (qos-)data::nullfunc frames silently, since they
1335 * are used only to control station power saving mode.
1337 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1338 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1339 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1342 * If we receive a 4-addr nullfunc frame from a STA
1343 * that was not moved to a 4-addr STA vlan yet, drop
1344 * the frame to the monitor interface, to make sure
1345 * that hostapd sees it
1347 if (ieee80211_has_a4(hdr->frame_control) &&
1348 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1349 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1350 !rx->sdata->u.vlan.sta)))
1351 return RX_DROP_MONITOR;
1353 * Update counter and free packet here to avoid
1354 * counting this as a dropped packed.
1357 dev_kfree_skb(rx->skb);
1362 } /* ieee80211_rx_h_sta_process */
1364 static inline struct ieee80211_fragment_entry *
1365 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1366 unsigned int frag, unsigned int seq, int rx_queue,
1367 struct sk_buff **skb)
1369 struct ieee80211_fragment_entry *entry;
1372 idx = sdata->fragment_next;
1373 entry = &sdata->fragments[sdata->fragment_next++];
1374 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1375 sdata->fragment_next = 0;
1377 if (!skb_queue_empty(&entry->skb_list)) {
1378 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1379 struct ieee80211_hdr *hdr =
1380 (struct ieee80211_hdr *) entry->skb_list.next->data;
1381 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1382 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1383 "addr1=%pM addr2=%pM\n",
1385 jiffies - entry->first_frag_time, entry->seq,
1386 entry->last_frag, hdr->addr1, hdr->addr2);
1388 __skb_queue_purge(&entry->skb_list);
1391 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1393 entry->first_frag_time = jiffies;
1395 entry->rx_queue = rx_queue;
1396 entry->last_frag = frag;
1398 entry->extra_len = 0;
1403 static inline struct ieee80211_fragment_entry *
1404 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1405 unsigned int frag, unsigned int seq,
1406 int rx_queue, struct ieee80211_hdr *hdr)
1408 struct ieee80211_fragment_entry *entry;
1411 idx = sdata->fragment_next;
1412 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1413 struct ieee80211_hdr *f_hdr;
1417 idx = IEEE80211_FRAGMENT_MAX - 1;
1419 entry = &sdata->fragments[idx];
1420 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1421 entry->rx_queue != rx_queue ||
1422 entry->last_frag + 1 != frag)
1425 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1428 * Check ftype and addresses are equal, else check next fragment
1430 if (((hdr->frame_control ^ f_hdr->frame_control) &
1431 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1432 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1433 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1436 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1437 __skb_queue_purge(&entry->skb_list);
1446 static ieee80211_rx_result debug_noinline
1447 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1449 struct ieee80211_hdr *hdr;
1452 unsigned int frag, seq;
1453 struct ieee80211_fragment_entry *entry;
1454 struct sk_buff *skb;
1455 struct ieee80211_rx_status *status;
1457 hdr = (struct ieee80211_hdr *)rx->skb->data;
1458 fc = hdr->frame_control;
1460 if (ieee80211_is_ctl(fc))
1463 sc = le16_to_cpu(hdr->seq_ctrl);
1464 frag = sc & IEEE80211_SCTL_FRAG;
1466 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1467 is_multicast_ether_addr(hdr->addr1))) {
1468 /* not fragmented */
1471 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1473 if (skb_linearize(rx->skb))
1474 return RX_DROP_UNUSABLE;
1477 * skb_linearize() might change the skb->data and
1478 * previously cached variables (in this case, hdr) need to
1479 * be refreshed with the new data.
1481 hdr = (struct ieee80211_hdr *)rx->skb->data;
1482 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1485 /* This is the first fragment of a new frame. */
1486 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1487 rx->seqno_idx, &(rx->skb));
1488 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1489 ieee80211_has_protected(fc)) {
1490 int queue = rx->security_idx;
1491 /* Store CCMP PN so that we can verify that the next
1492 * fragment has a sequential PN value. */
1494 memcpy(entry->last_pn,
1495 rx->key->u.ccmp.rx_pn[queue],
1501 /* This is a fragment for a frame that should already be pending in
1502 * fragment cache. Add this fragment to the end of the pending entry.
1504 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1505 rx->seqno_idx, hdr);
1507 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1508 return RX_DROP_MONITOR;
1511 /* Verify that MPDUs within one MSDU have sequential PN values.
1512 * (IEEE 802.11i, 8.3.3.4.5) */
1515 u8 pn[CCMP_PN_LEN], *rpn;
1517 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1518 return RX_DROP_UNUSABLE;
1519 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1520 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1525 queue = rx->security_idx;
1526 rpn = rx->key->u.ccmp.rx_pn[queue];
1527 if (memcmp(pn, rpn, CCMP_PN_LEN))
1528 return RX_DROP_UNUSABLE;
1529 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1532 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1533 __skb_queue_tail(&entry->skb_list, rx->skb);
1534 entry->last_frag = frag;
1535 entry->extra_len += rx->skb->len;
1536 if (ieee80211_has_morefrags(fc)) {
1541 rx->skb = __skb_dequeue(&entry->skb_list);
1542 if (skb_tailroom(rx->skb) < entry->extra_len) {
1543 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1544 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1546 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1547 __skb_queue_purge(&entry->skb_list);
1548 return RX_DROP_UNUSABLE;
1551 while ((skb = __skb_dequeue(&entry->skb_list))) {
1552 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1556 /* Complete frame has been reassembled - process it now */
1557 status = IEEE80211_SKB_RXCB(rx->skb);
1558 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1562 rx->sta->rx_packets++;
1563 if (is_multicast_ether_addr(hdr->addr1))
1564 rx->local->dot11MulticastReceivedFrameCount++;
1566 ieee80211_led_rx(rx->local);
1570 static ieee80211_rx_result debug_noinline
1571 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1573 u8 *data = rx->skb->data;
1574 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1576 if (!ieee80211_is_data_qos(hdr->frame_control))
1579 /* remove the qos control field, update frame type and meta-data */
1580 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1581 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1582 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1583 /* change frame type to non QOS */
1584 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1590 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1592 if (unlikely(!rx->sta ||
1593 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1600 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1602 struct sk_buff *skb = rx->skb;
1603 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1606 * Pass through unencrypted frames if the hardware has
1607 * decrypted them already.
1609 if (status->flag & RX_FLAG_DECRYPTED)
1612 /* Drop unencrypted frames if key is set. */
1613 if (unlikely(!ieee80211_has_protected(fc) &&
1614 !ieee80211_is_nullfunc(fc) &&
1615 ieee80211_is_data(fc) &&
1616 (rx->key || rx->sdata->drop_unencrypted)))
1623 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1625 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1626 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1627 __le16 fc = hdr->frame_control;
1630 * Pass through unencrypted frames if the hardware has
1631 * decrypted them already.
1633 if (status->flag & RX_FLAG_DECRYPTED)
1636 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1637 if (unlikely(!ieee80211_has_protected(fc) &&
1638 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1640 if (ieee80211_is_deauth(fc))
1641 cfg80211_send_unprot_deauth(rx->sdata->dev,
1644 else if (ieee80211_is_disassoc(fc))
1645 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1650 /* BIP does not use Protected field, so need to check MMIE */
1651 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1652 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1653 if (ieee80211_is_deauth(fc))
1654 cfg80211_send_unprot_deauth(rx->sdata->dev,
1657 else if (ieee80211_is_disassoc(fc))
1658 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1664 * When using MFP, Action frames are not allowed prior to
1665 * having configured keys.
1667 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1668 ieee80211_is_robust_mgmt_frame(
1669 (struct ieee80211_hdr *) rx->skb->data)))
1677 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1679 struct ieee80211_sub_if_data *sdata = rx->sdata;
1680 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1681 bool check_port_control = false;
1682 struct ethhdr *ehdr;
1685 *port_control = false;
1686 if (ieee80211_has_a4(hdr->frame_control) &&
1687 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1690 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1691 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1693 if (!sdata->u.mgd.use_4addr)
1696 check_port_control = true;
1699 if (is_multicast_ether_addr(hdr->addr1) &&
1700 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1703 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1707 ehdr = (struct ethhdr *) rx->skb->data;
1708 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1709 *port_control = true;
1710 else if (check_port_control)
1717 * requires that rx->skb is a frame with ethernet header
1719 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1721 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1722 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1723 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1726 * Allow EAPOL frames to us/the PAE group address regardless
1727 * of whether the frame was encrypted or not.
1729 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1730 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1731 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1734 if (ieee80211_802_1x_port_control(rx) ||
1735 ieee80211_drop_unencrypted(rx, fc))
1742 * requires that rx->skb is a frame with ethernet header
1745 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1747 struct ieee80211_sub_if_data *sdata = rx->sdata;
1748 struct net_device *dev = sdata->dev;
1749 struct sk_buff *skb, *xmit_skb;
1750 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1751 struct sta_info *dsta;
1752 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1757 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1758 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1759 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1760 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1761 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1762 if (is_multicast_ether_addr(ehdr->h_dest)) {
1764 * send multicast frames both to higher layers in
1765 * local net stack and back to the wireless medium
1767 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1768 if (!xmit_skb && net_ratelimit())
1769 printk(KERN_DEBUG "%s: failed to clone "
1770 "multicast frame\n", dev->name);
1772 dsta = sta_info_get(sdata, skb->data);
1775 * The destination station is associated to
1776 * this AP (in this VLAN), so send the frame
1777 * directly to it and do not pass it to local
1787 int align __maybe_unused;
1789 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1791 * 'align' will only take the values 0 or 2 here
1792 * since all frames are required to be aligned
1793 * to 2-byte boundaries when being passed to
1794 * mac80211. That also explains the __skb_push()
1797 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1799 if (WARN_ON(skb_headroom(skb) < 3)) {
1803 u8 *data = skb->data;
1804 size_t len = skb_headlen(skb);
1806 memmove(skb->data, data, len);
1807 skb_set_tail_pointer(skb, len);
1813 /* deliver to local stack */
1814 skb->protocol = eth_type_trans(skb, dev);
1815 memset(skb->cb, 0, sizeof(skb->cb));
1816 netif_receive_skb(skb);
1821 /* send to wireless media */
1822 xmit_skb->protocol = htons(ETH_P_802_3);
1823 skb_reset_network_header(xmit_skb);
1824 skb_reset_mac_header(xmit_skb);
1825 dev_queue_xmit(xmit_skb);
1829 static ieee80211_rx_result debug_noinline
1830 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1832 struct net_device *dev = rx->sdata->dev;
1833 struct sk_buff *skb = rx->skb;
1834 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1835 __le16 fc = hdr->frame_control;
1836 struct sk_buff_head frame_list;
1837 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1839 if (unlikely(!ieee80211_is_data(fc)))
1842 if (unlikely(!ieee80211_is_data_present(fc)))
1843 return RX_DROP_MONITOR;
1845 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1848 if (ieee80211_has_a4(hdr->frame_control) &&
1849 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1850 !rx->sdata->u.vlan.sta)
1851 return RX_DROP_UNUSABLE;
1853 if (is_multicast_ether_addr(hdr->addr1) &&
1854 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1855 rx->sdata->u.vlan.sta) ||
1856 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1857 rx->sdata->u.mgd.use_4addr)))
1858 return RX_DROP_UNUSABLE;
1861 __skb_queue_head_init(&frame_list);
1863 if (skb_linearize(skb))
1864 return RX_DROP_UNUSABLE;
1866 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1867 rx->sdata->vif.type,
1868 rx->local->hw.extra_tx_headroom, true);
1870 while (!skb_queue_empty(&frame_list)) {
1871 rx->skb = __skb_dequeue(&frame_list);
1873 if (!ieee80211_frame_allowed(rx, fc)) {
1874 dev_kfree_skb(rx->skb);
1877 dev->stats.rx_packets++;
1878 dev->stats.rx_bytes += rx->skb->len;
1880 ieee80211_deliver_skb(rx);
1886 #ifdef CONFIG_MAC80211_MESH
1887 static ieee80211_rx_result
1888 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1890 struct ieee80211_hdr *hdr;
1891 struct ieee80211s_hdr *mesh_hdr;
1892 unsigned int hdrlen;
1893 struct sk_buff *skb = rx->skb, *fwd_skb;
1894 struct ieee80211_local *local = rx->local;
1895 struct ieee80211_sub_if_data *sdata = rx->sdata;
1896 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1898 hdr = (struct ieee80211_hdr *) skb->data;
1899 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1901 /* make sure fixed part of mesh header is there, also checks skb len */
1902 if (!pskb_may_pull(rx->skb, hdrlen + 6))
1903 return RX_DROP_MONITOR;
1905 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1907 /* make sure full mesh header is there, also checks skb len */
1908 if (!pskb_may_pull(rx->skb,
1909 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
1910 return RX_DROP_MONITOR;
1912 /* reload pointers */
1913 hdr = (struct ieee80211_hdr *) skb->data;
1914 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1916 /* frame is in RMC, don't forward */
1917 if (ieee80211_is_data(hdr->frame_control) &&
1918 is_multicast_ether_addr(hdr->addr1) &&
1919 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1920 return RX_DROP_MONITOR;
1922 if (!ieee80211_is_data(hdr->frame_control) ||
1923 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1928 return RX_DROP_MONITOR;
1930 if (ieee80211_queue_stopped(&local->hw, skb_get_queue_mapping(skb))) {
1931 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1932 dropped_frames_congestion);
1933 return RX_DROP_MONITOR;
1936 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1937 struct mesh_path *mppath;
1941 if (is_multicast_ether_addr(hdr->addr1)) {
1942 mpp_addr = hdr->addr3;
1943 proxied_addr = mesh_hdr->eaddr1;
1944 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
1945 /* has_a4 already checked in ieee80211_rx_mesh_check */
1946 mpp_addr = hdr->addr4;
1947 proxied_addr = mesh_hdr->eaddr2;
1949 return RX_DROP_MONITOR;
1953 mppath = mpp_path_lookup(proxied_addr, sdata);
1955 mpp_path_add(proxied_addr, mpp_addr, sdata);
1957 spin_lock_bh(&mppath->state_lock);
1958 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1959 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1960 spin_unlock_bh(&mppath->state_lock);
1965 /* Frame has reached destination. Don't forward */
1966 if (!is_multicast_ether_addr(hdr->addr1) &&
1967 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1974 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1975 dropped_frames_ttl);
1977 struct ieee80211_hdr *fwd_hdr;
1978 struct ieee80211_tx_info *info;
1980 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1982 if (!fwd_skb && net_ratelimit())
1983 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1988 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1989 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1990 info = IEEE80211_SKB_CB(fwd_skb);
1991 memset(info, 0, sizeof(*info));
1992 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1993 info->control.vif = &rx->sdata->vif;
1994 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1995 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1997 skb_set_queue_mapping(fwd_skb,
1998 ieee80211_select_queue(sdata, fwd_skb));
1999 ieee80211_set_qos_hdr(sdata, fwd_skb);
2003 * Save TA to addr1 to send TA a path error if a
2004 * suitable next hop is not found
2006 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
2008 err = mesh_nexthop_lookup(fwd_skb, sdata);
2009 /* Failed to immediately resolve next hop:
2010 * fwded frame was dropped or will be added
2011 * later to the pending skb queue. */
2013 return RX_DROP_MONITOR;
2015 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
2018 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
2020 ieee80211_add_pending_skb(local, fwd_skb);
2025 if (is_multicast_ether_addr(hdr->addr1) ||
2026 sdata->dev->flags & IFF_PROMISC)
2029 return RX_DROP_MONITOR;
2033 static ieee80211_rx_result debug_noinline
2034 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2036 struct ieee80211_sub_if_data *sdata = rx->sdata;
2037 struct ieee80211_local *local = rx->local;
2038 struct net_device *dev = sdata->dev;
2039 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2040 __le16 fc = hdr->frame_control;
2044 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2047 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2048 return RX_DROP_MONITOR;
2051 * Allow the cooked monitor interface of an AP to see 4-addr frames so
2052 * that a 4-addr station can be detected and moved into a separate VLAN
2054 if (ieee80211_has_a4(hdr->frame_control) &&
2055 sdata->vif.type == NL80211_IFTYPE_AP)
2056 return RX_DROP_MONITOR;
2058 err = __ieee80211_data_to_8023(rx, &port_control);
2060 return RX_DROP_UNUSABLE;
2062 if (!ieee80211_frame_allowed(rx, fc))
2063 return RX_DROP_MONITOR;
2065 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2066 unlikely(port_control) && sdata->bss) {
2067 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2075 dev->stats.rx_packets++;
2076 dev->stats.rx_bytes += rx->skb->len;
2078 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2079 !is_multicast_ether_addr(
2080 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2081 (!local->scanning &&
2082 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2083 mod_timer(&local->dynamic_ps_timer, jiffies +
2084 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2087 ieee80211_deliver_skb(rx);
2092 static ieee80211_rx_result debug_noinline
2093 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2095 struct ieee80211_local *local = rx->local;
2096 struct ieee80211_hw *hw = &local->hw;
2097 struct sk_buff *skb = rx->skb;
2098 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2099 struct tid_ampdu_rx *tid_agg_rx;
2103 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2106 if (ieee80211_is_back_req(bar->frame_control)) {
2108 __le16 control, start_seq_num;
2109 } __packed bar_data;
2112 return RX_DROP_MONITOR;
2114 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2115 &bar_data, sizeof(bar_data)))
2116 return RX_DROP_MONITOR;
2118 tid = le16_to_cpu(bar_data.control) >> 12;
2120 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2122 return RX_DROP_MONITOR;
2124 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2126 /* reset session timer */
2127 if (tid_agg_rx->timeout)
2128 mod_timer(&tid_agg_rx->session_timer,
2129 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2131 spin_lock(&tid_agg_rx->reorder_lock);
2132 /* release stored frames up to start of BAR */
2133 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2134 spin_unlock(&tid_agg_rx->reorder_lock);
2141 * After this point, we only want management frames,
2142 * so we can drop all remaining control frames to
2143 * cooked monitor interfaces.
2145 return RX_DROP_MONITOR;
2148 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2149 struct ieee80211_mgmt *mgmt,
2152 struct ieee80211_local *local = sdata->local;
2153 struct sk_buff *skb;
2154 struct ieee80211_mgmt *resp;
2156 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2157 /* Not to own unicast address */
2161 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2162 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2163 /* Not from the current AP or not associated yet. */
2167 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2168 /* Too short SA Query request frame */
2172 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2176 skb_reserve(skb, local->hw.extra_tx_headroom);
2177 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2178 memset(resp, 0, 24);
2179 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2180 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2181 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2182 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2183 IEEE80211_STYPE_ACTION);
2184 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2185 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2186 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2187 memcpy(resp->u.action.u.sa_query.trans_id,
2188 mgmt->u.action.u.sa_query.trans_id,
2189 WLAN_SA_QUERY_TR_ID_LEN);
2191 ieee80211_tx_skb(sdata, skb);
2194 static ieee80211_rx_result debug_noinline
2195 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2197 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2198 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2201 * From here on, look only at management frames.
2202 * Data and control frames are already handled,
2203 * and unknown (reserved) frames are useless.
2205 if (rx->skb->len < 24)
2206 return RX_DROP_MONITOR;
2208 if (!ieee80211_is_mgmt(mgmt->frame_control))
2209 return RX_DROP_MONITOR;
2211 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2212 return RX_DROP_MONITOR;
2214 if (ieee80211_drop_unencrypted_mgmt(rx))
2215 return RX_DROP_UNUSABLE;
2220 static ieee80211_rx_result debug_noinline
2221 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2223 struct ieee80211_local *local = rx->local;
2224 struct ieee80211_sub_if_data *sdata = rx->sdata;
2225 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2226 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2227 int len = rx->skb->len;
2229 if (!ieee80211_is_action(mgmt->frame_control))
2232 /* drop too small frames */
2233 if (len < IEEE80211_MIN_ACTION_SIZE)
2234 return RX_DROP_UNUSABLE;
2236 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2237 return RX_DROP_UNUSABLE;
2239 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2240 return RX_DROP_UNUSABLE;
2242 switch (mgmt->u.action.category) {
2243 case WLAN_CATEGORY_BACK:
2245 * The aggregation code is not prepared to handle
2246 * anything but STA/AP due to the BSSID handling;
2247 * IBSS could work in the code but isn't supported
2248 * by drivers or the standard.
2250 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2251 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2252 sdata->vif.type != NL80211_IFTYPE_AP)
2255 /* verify action_code is present */
2256 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2259 switch (mgmt->u.action.u.addba_req.action_code) {
2260 case WLAN_ACTION_ADDBA_REQ:
2261 if (len < (IEEE80211_MIN_ACTION_SIZE +
2262 sizeof(mgmt->u.action.u.addba_req)))
2265 case WLAN_ACTION_ADDBA_RESP:
2266 if (len < (IEEE80211_MIN_ACTION_SIZE +
2267 sizeof(mgmt->u.action.u.addba_resp)))
2270 case WLAN_ACTION_DELBA:
2271 if (len < (IEEE80211_MIN_ACTION_SIZE +
2272 sizeof(mgmt->u.action.u.delba)))
2280 case WLAN_CATEGORY_SPECTRUM_MGMT:
2281 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2284 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2287 /* verify action_code is present */
2288 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2291 switch (mgmt->u.action.u.measurement.action_code) {
2292 case WLAN_ACTION_SPCT_MSR_REQ:
2293 if (len < (IEEE80211_MIN_ACTION_SIZE +
2294 sizeof(mgmt->u.action.u.measurement)))
2296 ieee80211_process_measurement_req(sdata, mgmt, len);
2298 case WLAN_ACTION_SPCT_CHL_SWITCH:
2299 if (len < (IEEE80211_MIN_ACTION_SIZE +
2300 sizeof(mgmt->u.action.u.chan_switch)))
2303 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2306 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2312 case WLAN_CATEGORY_SA_QUERY:
2313 if (len < (IEEE80211_MIN_ACTION_SIZE +
2314 sizeof(mgmt->u.action.u.sa_query)))
2317 switch (mgmt->u.action.u.sa_query.action) {
2318 case WLAN_ACTION_SA_QUERY_REQUEST:
2319 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2321 ieee80211_process_sa_query_req(sdata, mgmt, len);
2325 case WLAN_CATEGORY_SELF_PROTECTED:
2326 if (len < (IEEE80211_MIN_ACTION_SIZE +
2327 sizeof(mgmt->u.action.u.self_prot.action_code)))
2330 switch (mgmt->u.action.u.self_prot.action_code) {
2331 case WLAN_SP_MESH_PEERING_OPEN:
2332 case WLAN_SP_MESH_PEERING_CLOSE:
2333 case WLAN_SP_MESH_PEERING_CONFIRM:
2334 if (!ieee80211_vif_is_mesh(&sdata->vif))
2336 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2337 /* userspace handles this frame */
2340 case WLAN_SP_MGK_INFORM:
2341 case WLAN_SP_MGK_ACK:
2342 if (!ieee80211_vif_is_mesh(&sdata->vif))
2347 case WLAN_CATEGORY_MESH_ACTION:
2348 if (len < (IEEE80211_MIN_ACTION_SIZE +
2349 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2352 if (!ieee80211_vif_is_mesh(&sdata->vif))
2354 if (mesh_action_is_path_sel(mgmt) &&
2355 (!mesh_path_sel_is_hwmp(sdata)))
2363 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2364 /* will return in the next handlers */
2369 rx->sta->rx_packets++;
2370 dev_kfree_skb(rx->skb);
2374 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2375 skb_queue_tail(&sdata->skb_queue, rx->skb);
2376 ieee80211_queue_work(&local->hw, &sdata->work);
2378 rx->sta->rx_packets++;
2382 static ieee80211_rx_result debug_noinline
2383 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2385 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2387 /* skip known-bad action frames and return them in the next handler */
2388 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2392 * Getting here means the kernel doesn't know how to handle
2393 * it, but maybe userspace does ... include returned frames
2394 * so userspace can register for those to know whether ones
2395 * it transmitted were processed or returned.
2398 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2399 rx->skb->data, rx->skb->len,
2402 rx->sta->rx_packets++;
2403 dev_kfree_skb(rx->skb);
2411 static ieee80211_rx_result debug_noinline
2412 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2414 struct ieee80211_local *local = rx->local;
2415 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2416 struct sk_buff *nskb;
2417 struct ieee80211_sub_if_data *sdata = rx->sdata;
2418 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2420 if (!ieee80211_is_action(mgmt->frame_control))
2424 * For AP mode, hostapd is responsible for handling any action
2425 * frames that we didn't handle, including returning unknown
2426 * ones. For all other modes we will return them to the sender,
2427 * setting the 0x80 bit in the action category, as required by
2428 * 802.11-2012 9.24.4.
2429 * Newer versions of hostapd shall also use the management frame
2430 * registration mechanisms, but older ones still use cooked
2431 * monitor interfaces so push all frames there.
2433 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2434 (sdata->vif.type == NL80211_IFTYPE_AP ||
2435 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2436 return RX_DROP_MONITOR;
2438 if (is_multicast_ether_addr(mgmt->da))
2439 return RX_DROP_MONITOR;
2441 /* do not return rejected action frames */
2442 if (mgmt->u.action.category & 0x80)
2443 return RX_DROP_UNUSABLE;
2445 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2448 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2450 nmgmt->u.action.category |= 0x80;
2451 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2452 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2454 memset(nskb->cb, 0, sizeof(nskb->cb));
2456 ieee80211_tx_skb(rx->sdata, nskb);
2458 dev_kfree_skb(rx->skb);
2462 static ieee80211_rx_result debug_noinline
2463 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2465 struct ieee80211_sub_if_data *sdata = rx->sdata;
2466 ieee80211_rx_result rxs;
2467 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2470 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2471 if (rxs != RX_CONTINUE)
2474 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2476 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2477 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2478 sdata->vif.type != NL80211_IFTYPE_STATION)
2479 return RX_DROP_MONITOR;
2482 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2483 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2484 /* process for all: mesh, mlme, ibss */
2486 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2487 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2488 if (is_multicast_ether_addr(mgmt->da) &&
2489 !is_broadcast_ether_addr(mgmt->da))
2490 return RX_DROP_MONITOR;
2492 /* process only for station */
2493 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2494 return RX_DROP_MONITOR;
2496 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2497 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2498 /* process only for ibss */
2499 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2500 return RX_DROP_MONITOR;
2503 return RX_DROP_MONITOR;
2506 /* queue up frame and kick off work to process it */
2507 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2508 skb_queue_tail(&sdata->skb_queue, rx->skb);
2509 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2511 rx->sta->rx_packets++;
2516 /* TODO: use IEEE80211_RX_FRAGMENTED */
2517 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2518 struct ieee80211_rate *rate)
2520 struct ieee80211_sub_if_data *sdata;
2521 struct ieee80211_local *local = rx->local;
2522 struct ieee80211_rtap_hdr {
2523 struct ieee80211_radiotap_header hdr;
2529 struct sk_buff *skb = rx->skb, *skb2;
2530 struct net_device *prev_dev = NULL;
2531 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2534 * If cooked monitor has been processed already, then
2535 * don't do it again. If not, set the flag.
2537 if (rx->flags & IEEE80211_RX_CMNTR)
2539 rx->flags |= IEEE80211_RX_CMNTR;
2541 if (skb_headroom(skb) < sizeof(*rthdr) &&
2542 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2545 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2546 memset(rthdr, 0, sizeof(*rthdr));
2547 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2548 rthdr->hdr.it_present =
2549 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2550 (1 << IEEE80211_RADIOTAP_CHANNEL));
2553 rthdr->rate_or_pad = rate->bitrate / 5;
2554 rthdr->hdr.it_present |=
2555 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2557 rthdr->chan_freq = cpu_to_le16(status->freq);
2559 if (status->band == IEEE80211_BAND_5GHZ)
2560 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2561 IEEE80211_CHAN_5GHZ);
2563 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2564 IEEE80211_CHAN_2GHZ);
2566 skb_set_mac_header(skb, 0);
2567 skb->ip_summed = CHECKSUM_UNNECESSARY;
2568 skb->pkt_type = PACKET_OTHERHOST;
2569 skb->protocol = htons(ETH_P_802_2);
2571 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2572 if (!ieee80211_sdata_running(sdata))
2575 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2576 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2580 skb2 = skb_clone(skb, GFP_ATOMIC);
2582 skb2->dev = prev_dev;
2583 netif_receive_skb(skb2);
2587 prev_dev = sdata->dev;
2588 sdata->dev->stats.rx_packets++;
2589 sdata->dev->stats.rx_bytes += skb->len;
2593 skb->dev = prev_dev;
2594 netif_receive_skb(skb);
2602 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2603 ieee80211_rx_result res)
2606 case RX_DROP_MONITOR:
2607 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2609 rx->sta->rx_dropped++;
2612 struct ieee80211_rate *rate = NULL;
2613 struct ieee80211_supported_band *sband;
2614 struct ieee80211_rx_status *status;
2616 status = IEEE80211_SKB_RXCB((rx->skb));
2618 sband = rx->local->hw.wiphy->bands[status->band];
2619 if (!(status->flag & RX_FLAG_HT))
2620 rate = &sband->bitrates[status->rate_idx];
2622 ieee80211_rx_cooked_monitor(rx, rate);
2625 case RX_DROP_UNUSABLE:
2626 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2628 rx->sta->rx_dropped++;
2629 dev_kfree_skb(rx->skb);
2632 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2637 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2639 ieee80211_rx_result res = RX_DROP_MONITOR;
2640 struct sk_buff *skb;
2642 #define CALL_RXH(rxh) \
2645 if (res != RX_CONTINUE) \
2649 spin_lock(&rx->local->rx_skb_queue.lock);
2650 if (rx->local->running_rx_handler)
2653 rx->local->running_rx_handler = true;
2655 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2656 spin_unlock(&rx->local->rx_skb_queue.lock);
2659 * all the other fields are valid across frames
2660 * that belong to an aMPDU since they are on the
2661 * same TID from the same station
2665 CALL_RXH(ieee80211_rx_h_decrypt)
2666 CALL_RXH(ieee80211_rx_h_check_more_data)
2667 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2668 CALL_RXH(ieee80211_rx_h_sta_process)
2669 CALL_RXH(ieee80211_rx_h_defragment)
2670 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2671 /* must be after MMIC verify so header is counted in MPDU mic */
2672 #ifdef CONFIG_MAC80211_MESH
2673 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2674 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2676 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2677 CALL_RXH(ieee80211_rx_h_amsdu)
2678 CALL_RXH(ieee80211_rx_h_data)
2679 CALL_RXH(ieee80211_rx_h_ctrl);
2680 CALL_RXH(ieee80211_rx_h_mgmt_check)
2681 CALL_RXH(ieee80211_rx_h_action)
2682 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2683 CALL_RXH(ieee80211_rx_h_action_return)
2684 CALL_RXH(ieee80211_rx_h_mgmt)
2687 ieee80211_rx_handlers_result(rx, res);
2688 spin_lock(&rx->local->rx_skb_queue.lock);
2692 rx->local->running_rx_handler = false;
2695 spin_unlock(&rx->local->rx_skb_queue.lock);
2698 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2700 ieee80211_rx_result res = RX_DROP_MONITOR;
2702 #define CALL_RXH(rxh) \
2705 if (res != RX_CONTINUE) \
2709 CALL_RXH(ieee80211_rx_h_passive_scan)
2710 CALL_RXH(ieee80211_rx_h_check)
2712 ieee80211_rx_reorder_ampdu(rx);
2714 ieee80211_rx_handlers(rx);
2718 ieee80211_rx_handlers_result(rx, res);
2724 * This function makes calls into the RX path, therefore
2725 * it has to be invoked under RCU read lock.
2727 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2729 struct ieee80211_rx_data rx = {
2731 .sdata = sta->sdata,
2732 .local = sta->local,
2733 /* This is OK -- must be QoS data frame */
2734 .security_idx = tid,
2738 struct tid_ampdu_rx *tid_agg_rx;
2740 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2744 spin_lock(&tid_agg_rx->reorder_lock);
2745 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2746 spin_unlock(&tid_agg_rx->reorder_lock);
2748 ieee80211_rx_handlers(&rx);
2751 /* main receive path */
2753 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2754 struct ieee80211_hdr *hdr)
2756 struct ieee80211_sub_if_data *sdata = rx->sdata;
2757 struct sk_buff *skb = rx->skb;
2758 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2759 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2760 int multicast = is_multicast_ether_addr(hdr->addr1);
2762 switch (sdata->vif.type) {
2763 case NL80211_IFTYPE_STATION:
2764 if (!bssid && !sdata->u.mgd.use_4addr)
2767 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2768 if (!(sdata->dev->flags & IFF_PROMISC) ||
2769 sdata->u.mgd.use_4addr)
2771 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2774 case NL80211_IFTYPE_ADHOC:
2777 if (ieee80211_is_beacon(hdr->frame_control)) {
2780 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2781 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2783 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2784 } else if (!multicast &&
2785 compare_ether_addr(sdata->vif.addr,
2787 if (!(sdata->dev->flags & IFF_PROMISC))
2789 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2790 } else if (!rx->sta) {
2792 if (status->flag & RX_FLAG_HT)
2793 rate_idx = 0; /* TODO: HT rates */
2795 rate_idx = status->rate_idx;
2796 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2797 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2800 case NL80211_IFTYPE_MESH_POINT:
2802 compare_ether_addr(sdata->vif.addr,
2804 if (!(sdata->dev->flags & IFF_PROMISC))
2807 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2810 case NL80211_IFTYPE_AP_VLAN:
2811 case NL80211_IFTYPE_AP:
2813 if (compare_ether_addr(sdata->vif.addr,
2816 } else if (!ieee80211_bssid_match(bssid,
2818 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2819 !ieee80211_is_beacon(hdr->frame_control) &&
2820 !(ieee80211_is_action(hdr->frame_control) &&
2823 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2826 case NL80211_IFTYPE_WDS:
2827 if (bssid || !ieee80211_is_data(hdr->frame_control))
2829 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2833 /* should never get here */
2842 * This function returns whether or not the SKB
2843 * was destined for RX processing or not, which,
2844 * if consume is true, is equivalent to whether
2845 * or not the skb was consumed.
2847 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2848 struct sk_buff *skb, bool consume)
2850 struct ieee80211_local *local = rx->local;
2851 struct ieee80211_sub_if_data *sdata = rx->sdata;
2852 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2853 struct ieee80211_hdr *hdr = (void *)skb->data;
2857 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2858 prepares = prepare_for_handlers(rx, hdr);
2864 skb = skb_copy(skb, GFP_ATOMIC);
2866 if (net_ratelimit())
2867 wiphy_debug(local->hw.wiphy,
2868 "failed to copy skb for %s\n",
2876 ieee80211_invoke_rx_handlers(rx);
2881 * This is the actual Rx frames handler. as it blongs to Rx path it must
2882 * be called with rcu_read_lock protection.
2884 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2885 struct sk_buff *skb)
2887 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2888 struct ieee80211_local *local = hw_to_local(hw);
2889 struct ieee80211_sub_if_data *sdata;
2890 struct ieee80211_hdr *hdr;
2892 struct ieee80211_rx_data rx;
2893 struct ieee80211_sub_if_data *prev;
2894 struct sta_info *sta, *tmp, *prev_sta;
2897 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2898 memset(&rx, 0, sizeof(rx));
2902 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2903 local->dot11ReceivedFragmentCount++;
2905 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2906 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2907 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2909 if (ieee80211_is_mgmt(fc)) {
2910 /* drop frame if too short for header */
2911 if (skb->len < ieee80211_hdrlen(fc))
2914 err = skb_linearize(skb);
2916 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2924 hdr = (struct ieee80211_hdr *)skb->data;
2925 ieee80211_parse_qos(&rx);
2926 ieee80211_verify_alignment(&rx);
2928 if (ieee80211_is_data(fc)) {
2931 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
2938 rx.sdata = prev_sta->sdata;
2939 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2946 rx.sdata = prev_sta->sdata;
2948 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2956 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2957 if (!ieee80211_sdata_running(sdata))
2960 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2961 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2965 * frame is destined for this interface, but if it's
2966 * not also for the previous one we handle that after
2967 * the loop to avoid copying the SKB once too much
2975 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
2977 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2983 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
2986 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2995 * This is the receive path handler. It is called by a low level driver when an
2996 * 802.11 MPDU is received from the hardware.
2998 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3000 struct ieee80211_local *local = hw_to_local(hw);
3001 struct ieee80211_rate *rate = NULL;
3002 struct ieee80211_supported_band *sband;
3003 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3005 WARN_ON_ONCE(softirq_count() == 0);
3007 if (WARN_ON(status->band < 0 ||
3008 status->band >= IEEE80211_NUM_BANDS))
3011 sband = local->hw.wiphy->bands[status->band];
3012 if (WARN_ON(!sband))
3016 * If we're suspending, it is possible although not too likely
3017 * that we'd be receiving frames after having already partially
3018 * quiesced the stack. We can't process such frames then since
3019 * that might, for example, cause stations to be added or other
3020 * driver callbacks be invoked.
3022 if (unlikely(local->quiescing || local->suspended))
3026 * The same happens when we're not even started,
3027 * but that's worth a warning.
3029 if (WARN_ON(!local->started))
3032 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3034 * Validate the rate, unless a PLCP error means that
3035 * we probably can't have a valid rate here anyway.
3038 if (status->flag & RX_FLAG_HT) {
3040 * rate_idx is MCS index, which can be [0-76]
3043 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3045 * Anything else would be some sort of driver or
3046 * hardware error. The driver should catch hardware
3049 if (WARN((status->rate_idx < 0 ||
3050 status->rate_idx > 76),
3051 "Rate marked as an HT rate but passed "
3052 "status->rate_idx is not "
3053 "an MCS index [0-76]: %d (0x%02x)\n",
3058 if (WARN_ON(status->rate_idx < 0 ||
3059 status->rate_idx >= sband->n_bitrates))
3061 rate = &sband->bitrates[status->rate_idx];
3065 status->rx_flags = 0;
3068 * key references and virtual interfaces are protected using RCU
3069 * and this requires that we are in a read-side RCU section during
3070 * receive processing
3075 * Frames with failed FCS/PLCP checksum are not returned,
3076 * all other frames are returned without radiotap header
3077 * if it was previously present.
3078 * Also, frames with less than 16 bytes are dropped.
3080 skb = ieee80211_rx_monitor(local, skb, rate);
3086 ieee80211_tpt_led_trig_rx(local,
3087 ((struct ieee80211_hdr *)skb->data)->frame_control,
3089 __ieee80211_rx_handle_packet(hw, skb);
3097 EXPORT_SYMBOL(ieee80211_rx);
3099 /* This is a version of the rx handler that can be called from hard irq
3100 * context. Post the skb on the queue and schedule the tasklet */
3101 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3103 struct ieee80211_local *local = hw_to_local(hw);
3105 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3107 skb->pkt_type = IEEE80211_RX_MSG;
3108 skb_queue_tail(&local->skb_queue, skb);
3109 tasklet_schedule(&local->tasklet);
3111 EXPORT_SYMBOL(ieee80211_rx_irqsafe);