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 (status->flag & RX_FLAG_HT) {
146 * MCS information is a separate field in radiotap,
147 * added below. The byte here is needed as padding
148 * for the channel though, so initialise it to 0.
152 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
153 *pos = rate->bitrate / 5;
157 /* IEEE80211_RADIOTAP_CHANNEL */
158 put_unaligned_le16(status->freq, pos);
160 if (status->band == IEEE80211_BAND_5GHZ)
161 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
163 else if (status->flag & RX_FLAG_HT)
164 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
166 else if (rate->flags & IEEE80211_RATE_ERP_G)
167 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
170 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
174 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
175 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
176 *pos = status->signal;
178 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
182 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
184 /* IEEE80211_RADIOTAP_ANTENNA */
185 *pos = status->antenna;
188 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
190 /* IEEE80211_RADIOTAP_RX_FLAGS */
191 /* ensure 2 byte alignment for the 2 byte field as required */
192 if ((pos - (u8 *)rthdr) & 1)
194 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
195 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
196 put_unaligned_le16(rx_flags, pos);
199 if (status->flag & RX_FLAG_HT) {
200 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
201 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
202 IEEE80211_RADIOTAP_MCS_HAVE_GI |
203 IEEE80211_RADIOTAP_MCS_HAVE_BW;
205 if (status->flag & RX_FLAG_SHORT_GI)
206 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
207 if (status->flag & RX_FLAG_40MHZ)
208 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
210 *pos++ = status->rate_idx;
215 * This function copies a received frame to all monitor interfaces and
216 * returns a cleaned-up SKB that no longer includes the FCS nor the
217 * radiotap header the driver might have added.
219 static struct sk_buff *
220 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
221 struct ieee80211_rate *rate)
223 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
224 struct ieee80211_sub_if_data *sdata;
225 int needed_headroom = 0;
226 struct sk_buff *skb, *skb2;
227 struct net_device *prev_dev = NULL;
228 int present_fcs_len = 0;
231 * First, we may need to make a copy of the skb because
232 * (1) we need to modify it for radiotap (if not present), and
233 * (2) the other RX handlers will modify the skb we got.
235 * We don't need to, of course, if we aren't going to return
236 * the SKB because it has a bad FCS/PLCP checksum.
239 /* room for the radiotap header based on driver features */
240 needed_headroom = ieee80211_rx_radiotap_len(local, status);
242 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
243 present_fcs_len = FCS_LEN;
245 /* make sure hdr->frame_control is on the linear part */
246 if (!pskb_may_pull(origskb, 2)) {
247 dev_kfree_skb(origskb);
251 if (!local->monitors) {
252 if (should_drop_frame(origskb, present_fcs_len)) {
253 dev_kfree_skb(origskb);
257 return remove_monitor_info(local, origskb);
260 if (should_drop_frame(origskb, present_fcs_len)) {
261 /* only need to expand headroom if necessary */
266 * This shouldn't trigger often because most devices have an
267 * RX header they pull before we get here, and that should
268 * be big enough for our radiotap information. We should
269 * probably export the length to drivers so that we can have
270 * them allocate enough headroom to start with.
272 if (skb_headroom(skb) < needed_headroom &&
273 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
279 * Need to make a copy and possibly remove radiotap header
280 * and FCS from the original.
282 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
284 origskb = remove_monitor_info(local, origskb);
290 /* prepend radiotap information */
291 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
293 skb_reset_mac_header(skb);
294 skb->ip_summed = CHECKSUM_UNNECESSARY;
295 skb->pkt_type = PACKET_OTHERHOST;
296 skb->protocol = htons(ETH_P_802_2);
298 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
299 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
302 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
305 if (!ieee80211_sdata_running(sdata))
309 skb2 = skb_clone(skb, GFP_ATOMIC);
311 skb2->dev = prev_dev;
312 netif_receive_skb(skb2);
316 prev_dev = sdata->dev;
317 sdata->dev->stats.rx_packets++;
318 sdata->dev->stats.rx_bytes += skb->len;
323 netif_receive_skb(skb);
331 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
333 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
334 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
335 int tid, seqno_idx, security_idx;
337 /* does the frame have a qos control field? */
338 if (ieee80211_is_data_qos(hdr->frame_control)) {
339 u8 *qc = ieee80211_get_qos_ctl(hdr);
340 /* frame has qos control */
341 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
342 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
343 status->rx_flags |= IEEE80211_RX_AMSDU;
349 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
351 * Sequence numbers for management frames, QoS data
352 * frames with a broadcast/multicast address in the
353 * Address 1 field, and all non-QoS data frames sent
354 * by QoS STAs are assigned using an additional single
355 * modulo-4096 counter, [...]
357 * We also use that counter for non-QoS STAs.
359 seqno_idx = NUM_RX_DATA_QUEUES;
361 if (ieee80211_is_mgmt(hdr->frame_control))
362 security_idx = NUM_RX_DATA_QUEUES;
366 rx->seqno_idx = seqno_idx;
367 rx->security_idx = security_idx;
368 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
369 * For now, set skb->priority to 0 for other cases. */
370 rx->skb->priority = (tid > 7) ? 0 : tid;
374 * DOC: Packet alignment
376 * Drivers always need to pass packets that are aligned to two-byte boundaries
379 * Additionally, should, if possible, align the payload data in a way that
380 * guarantees that the contained IP header is aligned to a four-byte
381 * boundary. In the case of regular frames, this simply means aligning the
382 * payload to a four-byte boundary (because either the IP header is directly
383 * contained, or IV/RFC1042 headers that have a length divisible by four are
384 * in front of it). If the payload data is not properly aligned and the
385 * architecture doesn't support efficient unaligned operations, mac80211
386 * will align the data.
388 * With A-MSDU frames, however, the payload data address must yield two modulo
389 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
390 * push the IP header further back to a multiple of four again. Thankfully, the
391 * specs were sane enough this time around to require padding each A-MSDU
392 * subframe to a length that is a multiple of four.
394 * Padding like Atheros hardware adds which is between the 802.11 header and
395 * the payload is not supported, the driver is required to move the 802.11
396 * header to be directly in front of the payload in that case.
398 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
400 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
401 WARN_ONCE((unsigned long)rx->skb->data & 1,
402 "unaligned packet at 0x%p\n", rx->skb->data);
409 static ieee80211_rx_result debug_noinline
410 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
412 struct ieee80211_local *local = rx->local;
413 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
414 struct sk_buff *skb = rx->skb;
416 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
417 !local->sched_scanning))
420 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
421 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
422 local->sched_scanning)
423 return ieee80211_scan_rx(rx->sdata, skb);
425 /* scanning finished during invoking of handlers */
426 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
427 return RX_DROP_UNUSABLE;
431 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
433 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
435 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
438 return ieee80211_is_robust_mgmt_frame(hdr);
442 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
444 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
446 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
449 return ieee80211_is_robust_mgmt_frame(hdr);
453 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
454 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
456 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
457 struct ieee80211_mmie *mmie;
459 if (skb->len < 24 + sizeof(*mmie) ||
460 !is_multicast_ether_addr(hdr->da))
463 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
464 return -1; /* not a robust management frame */
466 mmie = (struct ieee80211_mmie *)
467 (skb->data + skb->len - sizeof(*mmie));
468 if (mmie->element_id != WLAN_EID_MMIE ||
469 mmie->length != sizeof(*mmie) - 2)
472 return le16_to_cpu(mmie->key_id);
476 static ieee80211_rx_result
477 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
480 char *dev_addr = rx->sdata->vif.addr;
482 if (ieee80211_is_data(hdr->frame_control)) {
483 if (is_multicast_ether_addr(hdr->addr1)) {
484 if (ieee80211_has_tods(hdr->frame_control) ||
485 !ieee80211_has_fromds(hdr->frame_control))
486 return RX_DROP_MONITOR;
487 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
488 return RX_DROP_MONITOR;
490 if (!ieee80211_has_a4(hdr->frame_control))
491 return RX_DROP_MONITOR;
492 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
493 return RX_DROP_MONITOR;
497 /* If there is not an established peer link and this is not a peer link
498 * establisment frame, beacon or probe, drop the frame.
501 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
502 struct ieee80211_mgmt *mgmt;
504 if (!ieee80211_is_mgmt(hdr->frame_control))
505 return RX_DROP_MONITOR;
507 if (ieee80211_is_action(hdr->frame_control)) {
509 mgmt = (struct ieee80211_mgmt *)hdr;
510 category = mgmt->u.action.category;
511 if (category != WLAN_CATEGORY_MESH_ACTION &&
512 category != WLAN_CATEGORY_SELF_PROTECTED)
513 return RX_DROP_MONITOR;
517 if (ieee80211_is_probe_req(hdr->frame_control) ||
518 ieee80211_is_probe_resp(hdr->frame_control) ||
519 ieee80211_is_beacon(hdr->frame_control) ||
520 ieee80211_is_auth(hdr->frame_control))
523 return RX_DROP_MONITOR;
530 #define SEQ_MODULO 0x1000
531 #define SEQ_MASK 0xfff
533 static inline int seq_less(u16 sq1, u16 sq2)
535 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
538 static inline u16 seq_inc(u16 sq)
540 return (sq + 1) & SEQ_MASK;
543 static inline u16 seq_sub(u16 sq1, u16 sq2)
545 return (sq1 - sq2) & SEQ_MASK;
549 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
550 struct tid_ampdu_rx *tid_agg_rx,
553 struct ieee80211_local *local = hw_to_local(hw);
554 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
555 struct ieee80211_rx_status *status;
557 lockdep_assert_held(&tid_agg_rx->reorder_lock);
562 /* release the frame from the reorder ring buffer */
563 tid_agg_rx->stored_mpdu_num--;
564 tid_agg_rx->reorder_buf[index] = NULL;
565 status = IEEE80211_SKB_RXCB(skb);
566 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
567 skb_queue_tail(&local->rx_skb_queue, skb);
570 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
573 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
574 struct tid_ampdu_rx *tid_agg_rx,
579 lockdep_assert_held(&tid_agg_rx->reorder_lock);
581 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
582 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
583 tid_agg_rx->buf_size;
584 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
589 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
590 * the skb was added to the buffer longer than this time ago, the earlier
591 * frames that have not yet been received are assumed to be lost and the skb
592 * can be released for processing. This may also release other skb's from the
593 * reorder buffer if there are no additional gaps between the frames.
595 * Callers must hold tid_agg_rx->reorder_lock.
597 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
599 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
600 struct tid_ampdu_rx *tid_agg_rx)
604 lockdep_assert_held(&tid_agg_rx->reorder_lock);
606 /* release the buffer until next missing frame */
607 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
608 tid_agg_rx->buf_size;
609 if (!tid_agg_rx->reorder_buf[index] &&
610 tid_agg_rx->stored_mpdu_num > 1) {
612 * No buffers ready to be released, but check whether any
613 * frames in the reorder buffer have timed out.
616 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
617 j = (j + 1) % tid_agg_rx->buf_size) {
618 if (!tid_agg_rx->reorder_buf[j]) {
623 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
624 HT_RX_REORDER_BUF_TIMEOUT))
625 goto set_release_timer;
627 #ifdef CONFIG_MAC80211_HT_DEBUG
629 wiphy_debug(hw->wiphy,
630 "release an RX reorder frame due to timeout on earlier frames\n");
632 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
635 * Increment the head seq# also for the skipped slots.
637 tid_agg_rx->head_seq_num =
638 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
641 } else while (tid_agg_rx->reorder_buf[index]) {
642 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
643 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
644 tid_agg_rx->buf_size;
647 if (tid_agg_rx->stored_mpdu_num) {
648 j = index = seq_sub(tid_agg_rx->head_seq_num,
649 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
651 for (; j != (index - 1) % tid_agg_rx->buf_size;
652 j = (j + 1) % tid_agg_rx->buf_size) {
653 if (tid_agg_rx->reorder_buf[j])
659 mod_timer(&tid_agg_rx->reorder_timer,
660 tid_agg_rx->reorder_time[j] + 1 +
661 HT_RX_REORDER_BUF_TIMEOUT);
663 del_timer(&tid_agg_rx->reorder_timer);
668 * As this function belongs to the RX path it must be under
669 * rcu_read_lock protection. It returns false if the frame
670 * can be processed immediately, true if it was consumed.
672 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
673 struct tid_ampdu_rx *tid_agg_rx,
676 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
677 u16 sc = le16_to_cpu(hdr->seq_ctrl);
678 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
679 u16 head_seq_num, buf_size;
683 spin_lock(&tid_agg_rx->reorder_lock);
685 buf_size = tid_agg_rx->buf_size;
686 head_seq_num = tid_agg_rx->head_seq_num;
688 /* frame with out of date sequence number */
689 if (seq_less(mpdu_seq_num, head_seq_num)) {
695 * If frame the sequence number exceeds our buffering window
696 * size release some previous frames to make room for this one.
698 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
699 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
700 /* release stored frames up to new head to stack */
701 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
704 /* Now the new frame is always in the range of the reordering buffer */
706 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
708 /* check if we already stored this frame */
709 if (tid_agg_rx->reorder_buf[index]) {
715 * If the current MPDU is in the right order and nothing else
716 * is stored we can process it directly, no need to buffer it.
717 * If it is first but there's something stored, we may be able
718 * to release frames after this one.
720 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
721 tid_agg_rx->stored_mpdu_num == 0) {
722 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
727 /* put the frame in the reordering buffer */
728 tid_agg_rx->reorder_buf[index] = skb;
729 tid_agg_rx->reorder_time[index] = jiffies;
730 tid_agg_rx->stored_mpdu_num++;
731 ieee80211_sta_reorder_release(hw, tid_agg_rx);
734 spin_unlock(&tid_agg_rx->reorder_lock);
739 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
740 * true if the MPDU was buffered, false if it should be processed.
742 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
744 struct sk_buff *skb = rx->skb;
745 struct ieee80211_local *local = rx->local;
746 struct ieee80211_hw *hw = &local->hw;
747 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
748 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
749 struct sta_info *sta = rx->sta;
750 struct tid_ampdu_rx *tid_agg_rx;
754 if (!ieee80211_is_data_qos(hdr->frame_control))
758 * filter the QoS data rx stream according to
759 * STA/TID and check if this STA/TID is on aggregation
765 ack_policy = *ieee80211_get_qos_ctl(hdr) &
766 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
767 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
769 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
773 /* qos null data frames are excluded */
774 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
777 /* not part of a BA session */
778 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
779 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
782 /* not actually part of this BA session */
783 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
786 /* new, potentially un-ordered, ampdu frame - process it */
788 /* reset session timer */
789 if (tid_agg_rx->timeout)
790 mod_timer(&tid_agg_rx->session_timer,
791 TU_TO_EXP_TIME(tid_agg_rx->timeout));
793 /* if this mpdu is fragmented - terminate rx aggregation session */
794 sc = le16_to_cpu(hdr->seq_ctrl);
795 if (sc & IEEE80211_SCTL_FRAG) {
796 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
797 skb_queue_tail(&rx->sdata->skb_queue, skb);
798 ieee80211_queue_work(&local->hw, &rx->sdata->work);
803 * No locking needed -- we will only ever process one
804 * RX packet at a time, and thus own tid_agg_rx. All
805 * other code manipulating it needs to (and does) make
806 * sure that we cannot get to it any more before doing
809 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
813 skb_queue_tail(&local->rx_skb_queue, skb);
816 static ieee80211_rx_result debug_noinline
817 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
819 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
820 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
822 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
823 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
824 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
825 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
827 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
828 rx->local->dot11FrameDuplicateCount++;
829 rx->sta->num_duplicates++;
831 return RX_DROP_UNUSABLE;
833 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
836 if (unlikely(rx->skb->len < 16)) {
837 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
838 return RX_DROP_MONITOR;
841 /* Drop disallowed frame classes based on STA auth/assoc state;
842 * IEEE 802.11, Chap 5.5.
844 * mac80211 filters only based on association state, i.e. it drops
845 * Class 3 frames from not associated stations. hostapd sends
846 * deauth/disassoc frames when needed. In addition, hostapd is
847 * responsible for filtering on both auth and assoc states.
850 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
851 return ieee80211_rx_mesh_check(rx);
853 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
854 ieee80211_is_pspoll(hdr->frame_control)) &&
855 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
856 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
857 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
858 if (rx->sta && rx->sta->dummy &&
859 ieee80211_is_data_present(hdr->frame_control)) {
863 payload = rx->skb->data +
864 ieee80211_hdrlen(hdr->frame_control);
865 ethertype = (payload[6] << 8) | payload[7];
866 if (cpu_to_be16(ethertype) ==
867 rx->sdata->control_port_protocol)
871 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
872 cfg80211_rx_spurious_frame(rx->sdata->dev,
875 return RX_DROP_UNUSABLE;
877 return RX_DROP_MONITOR;
884 static ieee80211_rx_result debug_noinline
885 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
887 struct sk_buff *skb = rx->skb;
888 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
889 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
892 ieee80211_rx_result result = RX_DROP_UNUSABLE;
893 struct ieee80211_key *sta_ptk = NULL;
894 int mmie_keyidx = -1;
900 * There are four types of keys:
902 * - IGTK (group keys for management frames)
903 * - PTK (pairwise keys)
904 * - STK (station-to-station pairwise keys)
906 * When selecting a key, we have to distinguish between multicast
907 * (including broadcast) and unicast frames, the latter can only
908 * use PTKs and STKs while the former always use GTKs and IGTKs.
909 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
910 * unicast frames can also use key indices like GTKs. Hence, if we
911 * don't have a PTK/STK we check the key index for a WEP key.
913 * Note that in a regular BSS, multicast frames are sent by the
914 * AP only, associated stations unicast the frame to the AP first
915 * which then multicasts it on their behalf.
917 * There is also a slight problem in IBSS mode: GTKs are negotiated
918 * with each station, that is something we don't currently handle.
919 * The spec seems to expect that one negotiates the same key with
920 * every station but there's no such requirement; VLANs could be
925 * No point in finding a key and decrypting if the frame is neither
926 * addressed to us nor a multicast frame.
928 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
931 /* start without a key */
935 sta_ptk = rcu_dereference(rx->sta->ptk);
937 fc = hdr->frame_control;
939 if (!ieee80211_has_protected(fc))
940 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
942 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
944 if ((status->flag & RX_FLAG_DECRYPTED) &&
945 (status->flag & RX_FLAG_IV_STRIPPED))
947 /* Skip decryption if the frame is not protected. */
948 if (!ieee80211_has_protected(fc))
950 } else if (mmie_keyidx >= 0) {
951 /* Broadcast/multicast robust management frame / BIP */
952 if ((status->flag & RX_FLAG_DECRYPTED) &&
953 (status->flag & RX_FLAG_IV_STRIPPED))
956 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
957 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
958 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
960 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
962 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
963 } else if (!ieee80211_has_protected(fc)) {
965 * The frame was not protected, so skip decryption. However, we
966 * need to set rx->key if there is a key that could have been
967 * used so that the frame may be dropped if encryption would
968 * have been expected.
970 struct ieee80211_key *key = NULL;
971 struct ieee80211_sub_if_data *sdata = rx->sdata;
974 if (ieee80211_is_mgmt(fc) &&
975 is_multicast_ether_addr(hdr->addr1) &&
976 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
980 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
981 key = rcu_dereference(rx->sta->gtk[i]);
987 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
988 key = rcu_dereference(sdata->keys[i]);
1000 * The device doesn't give us the IV so we won't be
1001 * able to look up the key. That's ok though, we
1002 * don't need to decrypt the frame, we just won't
1003 * be able to keep statistics accurate.
1004 * Except for key threshold notifications, should
1005 * we somehow allow the driver to tell us which key
1006 * the hardware used if this flag is set?
1008 if ((status->flag & RX_FLAG_DECRYPTED) &&
1009 (status->flag & RX_FLAG_IV_STRIPPED))
1012 hdrlen = ieee80211_hdrlen(fc);
1014 if (rx->skb->len < 8 + hdrlen)
1015 return RX_DROP_UNUSABLE; /* TODO: count this? */
1018 * no need to call ieee80211_wep_get_keyidx,
1019 * it verifies a bunch of things we've done already
1021 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1022 keyidx = keyid >> 6;
1024 /* check per-station GTK first, if multicast packet */
1025 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1026 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1028 /* if not found, try default key */
1030 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1033 * RSNA-protected unicast frames should always be
1034 * sent with pairwise or station-to-station keys,
1035 * but for WEP we allow using a key index as well.
1038 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1039 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1040 !is_multicast_ether_addr(hdr->addr1))
1046 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1047 return RX_DROP_MONITOR;
1049 rx->key->tx_rx_count++;
1050 /* TODO: add threshold stuff again */
1052 return RX_DROP_MONITOR;
1055 if (skb_linearize(rx->skb))
1056 return RX_DROP_UNUSABLE;
1057 /* the hdr variable is invalid now! */
1059 switch (rx->key->conf.cipher) {
1060 case WLAN_CIPHER_SUITE_WEP40:
1061 case WLAN_CIPHER_SUITE_WEP104:
1062 /* Check for weak IVs if possible */
1063 if (rx->sta && ieee80211_is_data(fc) &&
1064 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1065 !(status->flag & RX_FLAG_DECRYPTED)) &&
1066 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1067 rx->sta->wep_weak_iv_count++;
1069 result = ieee80211_crypto_wep_decrypt(rx);
1071 case WLAN_CIPHER_SUITE_TKIP:
1072 result = ieee80211_crypto_tkip_decrypt(rx);
1074 case WLAN_CIPHER_SUITE_CCMP:
1075 result = ieee80211_crypto_ccmp_decrypt(rx);
1077 case WLAN_CIPHER_SUITE_AES_CMAC:
1078 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1082 * We can reach here only with HW-only algorithms
1083 * but why didn't it decrypt the frame?!
1085 return RX_DROP_UNUSABLE;
1088 /* either the frame has been decrypted or will be dropped */
1089 status->flag |= RX_FLAG_DECRYPTED;
1094 static ieee80211_rx_result debug_noinline
1095 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1097 struct ieee80211_local *local;
1098 struct ieee80211_hdr *hdr;
1099 struct sk_buff *skb;
1103 hdr = (struct ieee80211_hdr *) skb->data;
1105 if (!local->pspolling)
1108 if (!ieee80211_has_fromds(hdr->frame_control))
1109 /* this is not from AP */
1112 if (!ieee80211_is_data(hdr->frame_control))
1115 if (!ieee80211_has_moredata(hdr->frame_control)) {
1116 /* AP has no more frames buffered for us */
1117 local->pspolling = false;
1121 /* more data bit is set, let's request a new frame from the AP */
1122 ieee80211_send_pspoll(local, rx->sdata);
1127 static void ap_sta_ps_start(struct sta_info *sta)
1129 struct ieee80211_sub_if_data *sdata = sta->sdata;
1130 struct ieee80211_local *local = sdata->local;
1132 atomic_inc(&sdata->bss->num_sta_ps);
1133 set_sta_flag(sta, WLAN_STA_PS_STA);
1134 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1135 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1136 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1137 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1138 sdata->name, sta->sta.addr, sta->sta.aid);
1139 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1142 static void ap_sta_ps_end(struct sta_info *sta)
1144 struct ieee80211_sub_if_data *sdata = sta->sdata;
1146 atomic_dec(&sdata->bss->num_sta_ps);
1148 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1149 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1150 sdata->name, sta->sta.addr, sta->sta.aid);
1151 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1153 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1154 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1155 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1156 sdata->name, sta->sta.addr, sta->sta.aid);
1157 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1161 ieee80211_sta_ps_deliver_wakeup(sta);
1164 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1166 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1169 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1171 /* Don't let the same PS state be set twice */
1172 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1173 if ((start && in_ps) || (!start && !in_ps))
1177 ap_sta_ps_start(sta_inf);
1179 ap_sta_ps_end(sta_inf);
1183 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1185 static ieee80211_rx_result debug_noinline
1186 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1188 struct ieee80211_sub_if_data *sdata = rx->sdata;
1189 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1190 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1193 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1196 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1197 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1201 * The device handles station powersave, so don't do anything about
1202 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1203 * it to mac80211 since they're handled.)
1205 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1209 * Don't do anything if the station isn't already asleep. In
1210 * the uAPSD case, the station will probably be marked asleep,
1211 * in the PS-Poll case the station must be confused ...
1213 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1216 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1217 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1218 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1219 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1221 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1224 /* Free PS Poll skb here instead of returning RX_DROP that would
1225 * count as an dropped frame. */
1226 dev_kfree_skb(rx->skb);
1229 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1230 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1231 ieee80211_has_pm(hdr->frame_control) &&
1232 (ieee80211_is_data_qos(hdr->frame_control) ||
1233 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1234 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1235 ac = ieee802_1d_to_ac[tid & 7];
1238 * If this AC is not trigger-enabled do nothing.
1240 * NB: This could/should check a separate bitmap of trigger-
1241 * enabled queues, but for now we only implement uAPSD w/o
1242 * TSPEC changes to the ACs, so they're always the same.
1244 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1247 /* if we are in a service period, do nothing */
1248 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1251 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1252 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1254 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1260 static ieee80211_rx_result debug_noinline
1261 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1263 struct sta_info *sta = rx->sta;
1264 struct sk_buff *skb = rx->skb;
1265 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1266 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1272 * Update last_rx only for IBSS packets which are for the current
1273 * BSSID to avoid keeping the current IBSS network alive in cases
1274 * where other STAs start using different BSSID.
1276 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1277 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1278 NL80211_IFTYPE_ADHOC);
1279 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
1280 sta->last_rx = jiffies;
1281 if (ieee80211_is_data(hdr->frame_control)) {
1282 sta->last_rx_rate_idx = status->rate_idx;
1283 sta->last_rx_rate_flag = status->flag;
1286 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1288 * Mesh beacons will update last_rx when if they are found to
1289 * match the current local configuration when processed.
1291 sta->last_rx = jiffies;
1292 if (ieee80211_is_data(hdr->frame_control)) {
1293 sta->last_rx_rate_idx = status->rate_idx;
1294 sta->last_rx_rate_flag = status->flag;
1298 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1301 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1302 ieee80211_sta_rx_notify(rx->sdata, hdr);
1304 sta->rx_fragments++;
1305 sta->rx_bytes += rx->skb->len;
1306 sta->last_signal = status->signal;
1307 ewma_add(&sta->avg_signal, -status->signal);
1310 * Change STA power saving mode only at the end of a frame
1311 * exchange sequence.
1313 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1314 !ieee80211_has_morefrags(hdr->frame_control) &&
1315 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1316 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1317 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1318 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1320 * Ignore doze->wake transitions that are
1321 * indicated by non-data frames, the standard
1322 * is unclear here, but for example going to
1323 * PS mode and then scanning would cause a
1324 * doze->wake transition for the probe request,
1325 * and that is clearly undesirable.
1327 if (ieee80211_is_data(hdr->frame_control) &&
1328 !ieee80211_has_pm(hdr->frame_control))
1331 if (ieee80211_has_pm(hdr->frame_control))
1332 ap_sta_ps_start(sta);
1337 * Drop (qos-)data::nullfunc frames silently, since they
1338 * are used only to control station power saving mode.
1340 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1341 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1342 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1345 * If we receive a 4-addr nullfunc frame from a STA
1346 * that was not moved to a 4-addr STA vlan yet send
1347 * the event to userspace and for older hostapd drop
1348 * the frame to the monitor interface.
1350 if (ieee80211_has_a4(hdr->frame_control) &&
1351 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1353 !rx->sdata->u.vlan.sta))) {
1354 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1355 cfg80211_rx_unexpected_4addr_frame(
1356 rx->sdata->dev, sta->sta.addr,
1358 return RX_DROP_MONITOR;
1361 * Update counter and free packet here to avoid
1362 * counting this as a dropped packed.
1365 dev_kfree_skb(rx->skb);
1370 } /* ieee80211_rx_h_sta_process */
1372 static inline struct ieee80211_fragment_entry *
1373 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1374 unsigned int frag, unsigned int seq, int rx_queue,
1375 struct sk_buff **skb)
1377 struct ieee80211_fragment_entry *entry;
1380 idx = sdata->fragment_next;
1381 entry = &sdata->fragments[sdata->fragment_next++];
1382 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1383 sdata->fragment_next = 0;
1385 if (!skb_queue_empty(&entry->skb_list)) {
1386 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1387 struct ieee80211_hdr *hdr =
1388 (struct ieee80211_hdr *) entry->skb_list.next->data;
1389 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1390 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1391 "addr1=%pM addr2=%pM\n",
1393 jiffies - entry->first_frag_time, entry->seq,
1394 entry->last_frag, hdr->addr1, hdr->addr2);
1396 __skb_queue_purge(&entry->skb_list);
1399 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1401 entry->first_frag_time = jiffies;
1403 entry->rx_queue = rx_queue;
1404 entry->last_frag = frag;
1406 entry->extra_len = 0;
1411 static inline struct ieee80211_fragment_entry *
1412 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1413 unsigned int frag, unsigned int seq,
1414 int rx_queue, struct ieee80211_hdr *hdr)
1416 struct ieee80211_fragment_entry *entry;
1419 idx = sdata->fragment_next;
1420 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1421 struct ieee80211_hdr *f_hdr;
1425 idx = IEEE80211_FRAGMENT_MAX - 1;
1427 entry = &sdata->fragments[idx];
1428 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1429 entry->rx_queue != rx_queue ||
1430 entry->last_frag + 1 != frag)
1433 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1436 * Check ftype and addresses are equal, else check next fragment
1438 if (((hdr->frame_control ^ f_hdr->frame_control) &
1439 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1440 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1441 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1444 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1445 __skb_queue_purge(&entry->skb_list);
1454 static ieee80211_rx_result debug_noinline
1455 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1457 struct ieee80211_hdr *hdr;
1460 unsigned int frag, seq;
1461 struct ieee80211_fragment_entry *entry;
1462 struct sk_buff *skb;
1463 struct ieee80211_rx_status *status;
1465 hdr = (struct ieee80211_hdr *)rx->skb->data;
1466 fc = hdr->frame_control;
1467 sc = le16_to_cpu(hdr->seq_ctrl);
1468 frag = sc & IEEE80211_SCTL_FRAG;
1470 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1471 (rx->skb)->len < 24 ||
1472 is_multicast_ether_addr(hdr->addr1))) {
1473 /* not fragmented */
1476 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1478 if (skb_linearize(rx->skb))
1479 return RX_DROP_UNUSABLE;
1482 * skb_linearize() might change the skb->data and
1483 * previously cached variables (in this case, hdr) need to
1484 * be refreshed with the new data.
1486 hdr = (struct ieee80211_hdr *)rx->skb->data;
1487 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1490 /* This is the first fragment of a new frame. */
1491 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1492 rx->seqno_idx, &(rx->skb));
1493 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1494 ieee80211_has_protected(fc)) {
1495 int queue = rx->security_idx;
1496 /* Store CCMP PN so that we can verify that the next
1497 * fragment has a sequential PN value. */
1499 memcpy(entry->last_pn,
1500 rx->key->u.ccmp.rx_pn[queue],
1506 /* This is a fragment for a frame that should already be pending in
1507 * fragment cache. Add this fragment to the end of the pending entry.
1509 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1510 rx->seqno_idx, hdr);
1512 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1513 return RX_DROP_MONITOR;
1516 /* Verify that MPDUs within one MSDU have sequential PN values.
1517 * (IEEE 802.11i, 8.3.3.4.5) */
1520 u8 pn[CCMP_PN_LEN], *rpn;
1522 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1523 return RX_DROP_UNUSABLE;
1524 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1525 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1530 queue = rx->security_idx;
1531 rpn = rx->key->u.ccmp.rx_pn[queue];
1532 if (memcmp(pn, rpn, CCMP_PN_LEN))
1533 return RX_DROP_UNUSABLE;
1534 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1537 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1538 __skb_queue_tail(&entry->skb_list, rx->skb);
1539 entry->last_frag = frag;
1540 entry->extra_len += rx->skb->len;
1541 if (ieee80211_has_morefrags(fc)) {
1546 rx->skb = __skb_dequeue(&entry->skb_list);
1547 if (skb_tailroom(rx->skb) < entry->extra_len) {
1548 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1549 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1551 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1552 __skb_queue_purge(&entry->skb_list);
1553 return RX_DROP_UNUSABLE;
1556 while ((skb = __skb_dequeue(&entry->skb_list))) {
1557 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1561 /* Complete frame has been reassembled - process it now */
1562 status = IEEE80211_SKB_RXCB(rx->skb);
1563 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1567 rx->sta->rx_packets++;
1568 if (is_multicast_ether_addr(hdr->addr1))
1569 rx->local->dot11MulticastReceivedFrameCount++;
1571 ieee80211_led_rx(rx->local);
1575 static ieee80211_rx_result debug_noinline
1576 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1578 u8 *data = rx->skb->data;
1579 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1581 if (!ieee80211_is_data_qos(hdr->frame_control))
1584 /* remove the qos control field, update frame type and meta-data */
1585 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1586 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1587 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1588 /* change frame type to non QOS */
1589 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1595 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1597 if (unlikely(!rx->sta ||
1598 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1605 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1607 struct sk_buff *skb = rx->skb;
1608 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1611 * Pass through unencrypted frames if the hardware has
1612 * decrypted them already.
1614 if (status->flag & RX_FLAG_DECRYPTED)
1617 /* Drop unencrypted frames if key is set. */
1618 if (unlikely(!ieee80211_has_protected(fc) &&
1619 !ieee80211_is_nullfunc(fc) &&
1620 ieee80211_is_data(fc) &&
1621 (rx->key || rx->sdata->drop_unencrypted)))
1628 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1630 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1631 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1632 __le16 fc = hdr->frame_control;
1635 * Pass through unencrypted frames if the hardware has
1636 * decrypted them already.
1638 if (status->flag & RX_FLAG_DECRYPTED)
1641 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1642 if (unlikely(!ieee80211_has_protected(fc) &&
1643 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1645 if (ieee80211_is_deauth(fc))
1646 cfg80211_send_unprot_deauth(rx->sdata->dev,
1649 else if (ieee80211_is_disassoc(fc))
1650 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1655 /* BIP does not use Protected field, so need to check MMIE */
1656 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1657 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1658 if (ieee80211_is_deauth(fc))
1659 cfg80211_send_unprot_deauth(rx->sdata->dev,
1662 else if (ieee80211_is_disassoc(fc))
1663 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1669 * When using MFP, Action frames are not allowed prior to
1670 * having configured keys.
1672 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1673 ieee80211_is_robust_mgmt_frame(
1674 (struct ieee80211_hdr *) rx->skb->data)))
1682 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1684 struct ieee80211_sub_if_data *sdata = rx->sdata;
1685 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1686 bool check_port_control = false;
1687 struct ethhdr *ehdr;
1690 *port_control = false;
1691 if (ieee80211_has_a4(hdr->frame_control) &&
1692 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1695 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1696 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1698 if (!sdata->u.mgd.use_4addr)
1701 check_port_control = true;
1704 if (is_multicast_ether_addr(hdr->addr1) &&
1705 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1708 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1712 ehdr = (struct ethhdr *) rx->skb->data;
1713 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1714 *port_control = true;
1715 else if (check_port_control)
1722 * requires that rx->skb is a frame with ethernet header
1724 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1726 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1727 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1728 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1731 * Allow EAPOL frames to us/the PAE group address regardless
1732 * of whether the frame was encrypted or not.
1734 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1735 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1736 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1739 if (ieee80211_802_1x_port_control(rx) ||
1740 ieee80211_drop_unencrypted(rx, fc))
1747 * requires that rx->skb is a frame with ethernet header
1750 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1752 struct ieee80211_sub_if_data *sdata = rx->sdata;
1753 struct net_device *dev = sdata->dev;
1754 struct sk_buff *skb, *xmit_skb;
1755 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1756 struct sta_info *dsta;
1757 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1762 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1763 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1764 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1765 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1766 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1767 if (is_multicast_ether_addr(ehdr->h_dest)) {
1769 * send multicast frames both to higher layers in
1770 * local net stack and back to the wireless medium
1772 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1773 if (!xmit_skb && net_ratelimit())
1774 printk(KERN_DEBUG "%s: failed to clone "
1775 "multicast frame\n", dev->name);
1777 dsta = sta_info_get(sdata, skb->data);
1780 * The destination station is associated to
1781 * this AP (in this VLAN), so send the frame
1782 * directly to it and do not pass it to local
1792 int align __maybe_unused;
1794 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1796 * 'align' will only take the values 0 or 2 here
1797 * since all frames are required to be aligned
1798 * to 2-byte boundaries when being passed to
1799 * mac80211. That also explains the __skb_push()
1802 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1804 if (WARN_ON(skb_headroom(skb) < 3)) {
1808 u8 *data = skb->data;
1809 size_t len = skb_headlen(skb);
1811 memmove(skb->data, data, len);
1812 skb_set_tail_pointer(skb, len);
1818 /* deliver to local stack */
1819 skb->protocol = eth_type_trans(skb, dev);
1820 memset(skb->cb, 0, sizeof(skb->cb));
1821 netif_receive_skb(skb);
1826 /* send to wireless media */
1827 xmit_skb->protocol = htons(ETH_P_802_3);
1828 skb_reset_network_header(xmit_skb);
1829 skb_reset_mac_header(xmit_skb);
1830 dev_queue_xmit(xmit_skb);
1834 static ieee80211_rx_result debug_noinline
1835 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1837 struct net_device *dev = rx->sdata->dev;
1838 struct sk_buff *skb = rx->skb;
1839 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1840 __le16 fc = hdr->frame_control;
1841 struct sk_buff_head frame_list;
1842 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1844 if (unlikely(!ieee80211_is_data(fc)))
1847 if (unlikely(!ieee80211_is_data_present(fc)))
1848 return RX_DROP_MONITOR;
1850 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1853 if (ieee80211_has_a4(hdr->frame_control) &&
1854 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1855 !rx->sdata->u.vlan.sta)
1856 return RX_DROP_UNUSABLE;
1858 if (is_multicast_ether_addr(hdr->addr1) &&
1859 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1860 rx->sdata->u.vlan.sta) ||
1861 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1862 rx->sdata->u.mgd.use_4addr)))
1863 return RX_DROP_UNUSABLE;
1866 __skb_queue_head_init(&frame_list);
1868 if (skb_linearize(skb))
1869 return RX_DROP_UNUSABLE;
1871 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1872 rx->sdata->vif.type,
1873 rx->local->hw.extra_tx_headroom, true);
1875 while (!skb_queue_empty(&frame_list)) {
1876 rx->skb = __skb_dequeue(&frame_list);
1878 if (!ieee80211_frame_allowed(rx, fc)) {
1879 dev_kfree_skb(rx->skb);
1882 dev->stats.rx_packets++;
1883 dev->stats.rx_bytes += rx->skb->len;
1885 ieee80211_deliver_skb(rx);
1891 #ifdef CONFIG_MAC80211_MESH
1892 static ieee80211_rx_result
1893 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1895 struct ieee80211_hdr *hdr;
1896 struct ieee80211s_hdr *mesh_hdr;
1897 unsigned int hdrlen;
1898 struct sk_buff *skb = rx->skb, *fwd_skb;
1899 struct ieee80211_local *local = rx->local;
1900 struct ieee80211_sub_if_data *sdata = rx->sdata;
1901 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1903 hdr = (struct ieee80211_hdr *) skb->data;
1904 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1905 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1907 /* frame is in RMC, don't forward */
1908 if (ieee80211_is_data(hdr->frame_control) &&
1909 is_multicast_ether_addr(hdr->addr1) &&
1910 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1911 return RX_DROP_MONITOR;
1913 if (!ieee80211_is_data(hdr->frame_control))
1918 return RX_DROP_MONITOR;
1920 if (ieee80211_queue_stopped(&local->hw, skb_get_queue_mapping(skb))) {
1921 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1922 dropped_frames_congestion);
1923 return RX_DROP_MONITOR;
1926 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1927 struct mesh_path *mppath;
1931 if (is_multicast_ether_addr(hdr->addr1)) {
1932 mpp_addr = hdr->addr3;
1933 proxied_addr = mesh_hdr->eaddr1;
1935 mpp_addr = hdr->addr4;
1936 proxied_addr = mesh_hdr->eaddr2;
1940 mppath = mpp_path_lookup(proxied_addr, sdata);
1942 mpp_path_add(proxied_addr, mpp_addr, sdata);
1944 spin_lock_bh(&mppath->state_lock);
1945 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1946 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1947 spin_unlock_bh(&mppath->state_lock);
1952 /* Frame has reached destination. Don't forward */
1953 if (!is_multicast_ether_addr(hdr->addr1) &&
1954 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1957 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb));
1960 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1962 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1963 dropped_frames_ttl);
1965 struct ieee80211_hdr *fwd_hdr;
1966 struct ieee80211_tx_info *info;
1968 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1970 if (!fwd_skb && net_ratelimit())
1971 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1976 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1977 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1978 info = IEEE80211_SKB_CB(fwd_skb);
1979 memset(info, 0, sizeof(*info));
1980 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1981 info->control.vif = &rx->sdata->vif;
1982 info->control.jiffies = jiffies;
1983 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1984 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1989 * Save TA to addr1 to send TA a path error if a
1990 * suitable next hop is not found
1992 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1994 err = mesh_nexthop_lookup(fwd_skb, sdata);
1995 /* Failed to immediately resolve next hop:
1996 * fwded frame was dropped or will be added
1997 * later to the pending skb queue. */
1999 return RX_DROP_MONITOR;
2001 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
2004 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
2006 ieee80211_add_pending_skb(local, fwd_skb);
2011 if (is_multicast_ether_addr(hdr->addr1) ||
2012 sdata->dev->flags & IFF_PROMISC)
2015 return RX_DROP_MONITOR;
2019 static ieee80211_rx_result debug_noinline
2020 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2022 struct ieee80211_sub_if_data *sdata = rx->sdata;
2023 struct ieee80211_local *local = rx->local;
2024 struct net_device *dev = sdata->dev;
2025 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2026 __le16 fc = hdr->frame_control;
2030 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2033 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2034 return RX_DROP_MONITOR;
2037 * Send unexpected-4addr-frame event to hostapd. For older versions,
2038 * also drop the frame to cooked monitor interfaces.
2040 if (ieee80211_has_a4(hdr->frame_control) &&
2041 sdata->vif.type == NL80211_IFTYPE_AP) {
2043 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2044 cfg80211_rx_unexpected_4addr_frame(
2045 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2046 return RX_DROP_MONITOR;
2049 err = __ieee80211_data_to_8023(rx, &port_control);
2051 return RX_DROP_UNUSABLE;
2053 if (!ieee80211_frame_allowed(rx, fc))
2054 return RX_DROP_MONITOR;
2056 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2057 unlikely(port_control) && sdata->bss) {
2058 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2066 dev->stats.rx_packets++;
2067 dev->stats.rx_bytes += rx->skb->len;
2069 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2070 !is_multicast_ether_addr(
2071 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2072 (!local->scanning &&
2073 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2074 mod_timer(&local->dynamic_ps_timer, jiffies +
2075 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2078 ieee80211_deliver_skb(rx);
2083 static ieee80211_rx_result debug_noinline
2084 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2086 struct ieee80211_local *local = rx->local;
2087 struct ieee80211_hw *hw = &local->hw;
2088 struct sk_buff *skb = rx->skb;
2089 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2090 struct tid_ampdu_rx *tid_agg_rx;
2094 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2097 if (ieee80211_is_back_req(bar->frame_control)) {
2099 __le16 control, start_seq_num;
2100 } __packed bar_data;
2103 return RX_DROP_MONITOR;
2105 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2106 &bar_data, sizeof(bar_data)))
2107 return RX_DROP_MONITOR;
2109 tid = le16_to_cpu(bar_data.control) >> 12;
2111 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2113 return RX_DROP_MONITOR;
2115 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2117 /* reset session timer */
2118 if (tid_agg_rx->timeout)
2119 mod_timer(&tid_agg_rx->session_timer,
2120 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2122 spin_lock(&tid_agg_rx->reorder_lock);
2123 /* release stored frames up to start of BAR */
2124 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2125 spin_unlock(&tid_agg_rx->reorder_lock);
2132 * After this point, we only want management frames,
2133 * so we can drop all remaining control frames to
2134 * cooked monitor interfaces.
2136 return RX_DROP_MONITOR;
2139 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2140 struct ieee80211_mgmt *mgmt,
2143 struct ieee80211_local *local = sdata->local;
2144 struct sk_buff *skb;
2145 struct ieee80211_mgmt *resp;
2147 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2148 /* Not to own unicast address */
2152 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2153 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2154 /* Not from the current AP or not associated yet. */
2158 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2159 /* Too short SA Query request frame */
2163 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2167 skb_reserve(skb, local->hw.extra_tx_headroom);
2168 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2169 memset(resp, 0, 24);
2170 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2171 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2172 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2173 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2174 IEEE80211_STYPE_ACTION);
2175 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2176 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2177 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2178 memcpy(resp->u.action.u.sa_query.trans_id,
2179 mgmt->u.action.u.sa_query.trans_id,
2180 WLAN_SA_QUERY_TR_ID_LEN);
2182 ieee80211_tx_skb(sdata, skb);
2185 static ieee80211_rx_result debug_noinline
2186 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2188 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2189 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2192 * From here on, look only at management frames.
2193 * Data and control frames are already handled,
2194 * and unknown (reserved) frames are useless.
2196 if (rx->skb->len < 24)
2197 return RX_DROP_MONITOR;
2199 if (!ieee80211_is_mgmt(mgmt->frame_control))
2200 return RX_DROP_MONITOR;
2202 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2203 ieee80211_is_beacon(mgmt->frame_control) &&
2204 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2205 struct ieee80211_rx_status *status;
2207 status = IEEE80211_SKB_RXCB(rx->skb);
2208 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2209 rx->skb->data, rx->skb->len,
2210 status->freq, GFP_ATOMIC);
2211 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2214 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2215 return RX_DROP_MONITOR;
2217 if (ieee80211_drop_unencrypted_mgmt(rx))
2218 return RX_DROP_UNUSABLE;
2223 static ieee80211_rx_result debug_noinline
2224 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2226 struct ieee80211_local *local = rx->local;
2227 struct ieee80211_sub_if_data *sdata = rx->sdata;
2228 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2229 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2230 int len = rx->skb->len;
2232 if (!ieee80211_is_action(mgmt->frame_control))
2235 /* drop too small frames */
2236 if (len < IEEE80211_MIN_ACTION_SIZE)
2237 return RX_DROP_UNUSABLE;
2239 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2240 return RX_DROP_UNUSABLE;
2242 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2243 return RX_DROP_UNUSABLE;
2245 switch (mgmt->u.action.category) {
2246 case WLAN_CATEGORY_BACK:
2247 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2248 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2249 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2250 sdata->vif.type != NL80211_IFTYPE_AP)
2253 /* verify action_code is present */
2254 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2257 switch (mgmt->u.action.u.addba_req.action_code) {
2258 case WLAN_ACTION_ADDBA_REQ:
2259 if (len < (IEEE80211_MIN_ACTION_SIZE +
2260 sizeof(mgmt->u.action.u.addba_req)))
2263 case WLAN_ACTION_ADDBA_RESP:
2264 if (len < (IEEE80211_MIN_ACTION_SIZE +
2265 sizeof(mgmt->u.action.u.addba_resp)))
2268 case WLAN_ACTION_DELBA:
2269 if (len < (IEEE80211_MIN_ACTION_SIZE +
2270 sizeof(mgmt->u.action.u.delba)))
2278 case WLAN_CATEGORY_SPECTRUM_MGMT:
2279 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2282 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2285 /* verify action_code is present */
2286 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2289 switch (mgmt->u.action.u.measurement.action_code) {
2290 case WLAN_ACTION_SPCT_MSR_REQ:
2291 if (len < (IEEE80211_MIN_ACTION_SIZE +
2292 sizeof(mgmt->u.action.u.measurement)))
2294 ieee80211_process_measurement_req(sdata, mgmt, len);
2296 case WLAN_ACTION_SPCT_CHL_SWITCH:
2297 if (len < (IEEE80211_MIN_ACTION_SIZE +
2298 sizeof(mgmt->u.action.u.chan_switch)))
2301 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2304 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2310 case WLAN_CATEGORY_SA_QUERY:
2311 if (len < (IEEE80211_MIN_ACTION_SIZE +
2312 sizeof(mgmt->u.action.u.sa_query)))
2315 switch (mgmt->u.action.u.sa_query.action) {
2316 case WLAN_ACTION_SA_QUERY_REQUEST:
2317 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2319 ieee80211_process_sa_query_req(sdata, mgmt, len);
2323 case WLAN_CATEGORY_SELF_PROTECTED:
2324 switch (mgmt->u.action.u.self_prot.action_code) {
2325 case WLAN_SP_MESH_PEERING_OPEN:
2326 case WLAN_SP_MESH_PEERING_CLOSE:
2327 case WLAN_SP_MESH_PEERING_CONFIRM:
2328 if (!ieee80211_vif_is_mesh(&sdata->vif))
2330 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2331 /* userspace handles this frame */
2334 case WLAN_SP_MGK_INFORM:
2335 case WLAN_SP_MGK_ACK:
2336 if (!ieee80211_vif_is_mesh(&sdata->vif))
2341 case WLAN_CATEGORY_MESH_ACTION:
2342 if (!ieee80211_vif_is_mesh(&sdata->vif))
2344 if (mesh_action_is_path_sel(mgmt) &&
2345 (!mesh_path_sel_is_hwmp(sdata)))
2353 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2354 /* will return in the next handlers */
2359 rx->sta->rx_packets++;
2360 dev_kfree_skb(rx->skb);
2364 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2365 skb_queue_tail(&sdata->skb_queue, rx->skb);
2366 ieee80211_queue_work(&local->hw, &sdata->work);
2368 rx->sta->rx_packets++;
2372 static ieee80211_rx_result debug_noinline
2373 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2375 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2377 /* skip known-bad action frames and return them in the next handler */
2378 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2382 * Getting here means the kernel doesn't know how to handle
2383 * it, but maybe userspace does ... include returned frames
2384 * so userspace can register for those to know whether ones
2385 * it transmitted were processed or returned.
2388 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2389 rx->skb->data, rx->skb->len,
2392 rx->sta->rx_packets++;
2393 dev_kfree_skb(rx->skb);
2401 static ieee80211_rx_result debug_noinline
2402 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2404 struct ieee80211_local *local = rx->local;
2405 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2406 struct sk_buff *nskb;
2407 struct ieee80211_sub_if_data *sdata = rx->sdata;
2408 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2410 if (!ieee80211_is_action(mgmt->frame_control))
2414 * For AP mode, hostapd is responsible for handling any action
2415 * frames that we didn't handle, including returning unknown
2416 * ones. For all other modes we will return them to the sender,
2417 * setting the 0x80 bit in the action category, as required by
2418 * 802.11-2007 7.3.1.11.
2419 * Newer versions of hostapd shall also use the management frame
2420 * registration mechanisms, but older ones still use cooked
2421 * monitor interfaces so push all frames there.
2423 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2424 (sdata->vif.type == NL80211_IFTYPE_AP ||
2425 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2426 return RX_DROP_MONITOR;
2428 /* do not return rejected action frames */
2429 if (mgmt->u.action.category & 0x80)
2430 return RX_DROP_UNUSABLE;
2432 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2435 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2437 nmgmt->u.action.category |= 0x80;
2438 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2439 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2441 memset(nskb->cb, 0, sizeof(nskb->cb));
2443 ieee80211_tx_skb(rx->sdata, nskb);
2445 dev_kfree_skb(rx->skb);
2449 static ieee80211_rx_result debug_noinline
2450 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2452 struct ieee80211_sub_if_data *sdata = rx->sdata;
2453 ieee80211_rx_result rxs;
2454 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2457 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2458 if (rxs != RX_CONTINUE)
2461 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2463 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2464 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2465 sdata->vif.type != NL80211_IFTYPE_STATION)
2466 return RX_DROP_MONITOR;
2469 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2470 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2471 /* process for all: mesh, mlme, ibss */
2473 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2474 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2475 if (is_multicast_ether_addr(mgmt->da) &&
2476 !is_broadcast_ether_addr(mgmt->da))
2477 return RX_DROP_MONITOR;
2479 /* process only for station */
2480 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2481 return RX_DROP_MONITOR;
2483 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2484 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2485 /* process only for ibss */
2486 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2487 return RX_DROP_MONITOR;
2490 return RX_DROP_MONITOR;
2493 /* queue up frame and kick off work to process it */
2494 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2495 skb_queue_tail(&sdata->skb_queue, rx->skb);
2496 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2498 rx->sta->rx_packets++;
2503 /* TODO: use IEEE80211_RX_FRAGMENTED */
2504 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2505 struct ieee80211_rate *rate)
2507 struct ieee80211_sub_if_data *sdata;
2508 struct ieee80211_local *local = rx->local;
2509 struct ieee80211_rtap_hdr {
2510 struct ieee80211_radiotap_header hdr;
2516 struct sk_buff *skb = rx->skb, *skb2;
2517 struct net_device *prev_dev = NULL;
2518 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2521 * If cooked monitor has been processed already, then
2522 * don't do it again. If not, set the flag.
2524 if (rx->flags & IEEE80211_RX_CMNTR)
2526 rx->flags |= IEEE80211_RX_CMNTR;
2528 /* If there are no cooked monitor interfaces, just free the SKB */
2529 if (!local->cooked_mntrs)
2532 if (skb_headroom(skb) < sizeof(*rthdr) &&
2533 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2536 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2537 memset(rthdr, 0, sizeof(*rthdr));
2538 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2539 rthdr->hdr.it_present =
2540 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2541 (1 << IEEE80211_RADIOTAP_CHANNEL));
2544 rthdr->rate_or_pad = rate->bitrate / 5;
2545 rthdr->hdr.it_present |=
2546 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2548 rthdr->chan_freq = cpu_to_le16(status->freq);
2550 if (status->band == IEEE80211_BAND_5GHZ)
2551 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2552 IEEE80211_CHAN_5GHZ);
2554 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2555 IEEE80211_CHAN_2GHZ);
2557 skb_set_mac_header(skb, 0);
2558 skb->ip_summed = CHECKSUM_UNNECESSARY;
2559 skb->pkt_type = PACKET_OTHERHOST;
2560 skb->protocol = htons(ETH_P_802_2);
2562 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2563 if (!ieee80211_sdata_running(sdata))
2566 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2567 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2571 skb2 = skb_clone(skb, GFP_ATOMIC);
2573 skb2->dev = prev_dev;
2574 netif_receive_skb(skb2);
2578 prev_dev = sdata->dev;
2579 sdata->dev->stats.rx_packets++;
2580 sdata->dev->stats.rx_bytes += skb->len;
2584 skb->dev = prev_dev;
2585 netif_receive_skb(skb);
2593 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2594 ieee80211_rx_result res)
2597 case RX_DROP_MONITOR:
2598 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2600 rx->sta->rx_dropped++;
2603 struct ieee80211_rate *rate = NULL;
2604 struct ieee80211_supported_band *sband;
2605 struct ieee80211_rx_status *status;
2607 status = IEEE80211_SKB_RXCB((rx->skb));
2609 sband = rx->local->hw.wiphy->bands[status->band];
2610 if (!(status->flag & RX_FLAG_HT))
2611 rate = &sband->bitrates[status->rate_idx];
2613 ieee80211_rx_cooked_monitor(rx, rate);
2616 case RX_DROP_UNUSABLE:
2617 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2619 rx->sta->rx_dropped++;
2620 dev_kfree_skb(rx->skb);
2623 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2628 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2630 ieee80211_rx_result res = RX_DROP_MONITOR;
2631 struct sk_buff *skb;
2633 #define CALL_RXH(rxh) \
2636 if (res != RX_CONTINUE) \
2640 spin_lock(&rx->local->rx_skb_queue.lock);
2641 if (rx->local->running_rx_handler)
2644 rx->local->running_rx_handler = true;
2646 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2647 spin_unlock(&rx->local->rx_skb_queue.lock);
2650 * all the other fields are valid across frames
2651 * that belong to an aMPDU since they are on the
2652 * same TID from the same station
2656 CALL_RXH(ieee80211_rx_h_decrypt)
2657 CALL_RXH(ieee80211_rx_h_check_more_data)
2658 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2659 CALL_RXH(ieee80211_rx_h_sta_process)
2660 CALL_RXH(ieee80211_rx_h_defragment)
2661 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2662 /* must be after MMIC verify so header is counted in MPDU mic */
2663 #ifdef CONFIG_MAC80211_MESH
2664 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2665 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2667 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2668 CALL_RXH(ieee80211_rx_h_amsdu)
2669 CALL_RXH(ieee80211_rx_h_data)
2670 CALL_RXH(ieee80211_rx_h_ctrl);
2671 CALL_RXH(ieee80211_rx_h_mgmt_check)
2672 CALL_RXH(ieee80211_rx_h_action)
2673 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2674 CALL_RXH(ieee80211_rx_h_action_return)
2675 CALL_RXH(ieee80211_rx_h_mgmt)
2678 ieee80211_rx_handlers_result(rx, res);
2679 spin_lock(&rx->local->rx_skb_queue.lock);
2683 rx->local->running_rx_handler = false;
2686 spin_unlock(&rx->local->rx_skb_queue.lock);
2689 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2691 ieee80211_rx_result res = RX_DROP_MONITOR;
2693 #define CALL_RXH(rxh) \
2696 if (res != RX_CONTINUE) \
2700 CALL_RXH(ieee80211_rx_h_passive_scan)
2701 CALL_RXH(ieee80211_rx_h_check)
2703 ieee80211_rx_reorder_ampdu(rx);
2705 ieee80211_rx_handlers(rx);
2709 ieee80211_rx_handlers_result(rx, res);
2715 * This function makes calls into the RX path, therefore
2716 * it has to be invoked under RCU read lock.
2718 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2720 struct ieee80211_rx_data rx = {
2722 .sdata = sta->sdata,
2723 .local = sta->local,
2724 /* This is OK -- must be QoS data frame */
2725 .security_idx = tid,
2729 struct tid_ampdu_rx *tid_agg_rx;
2731 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2735 spin_lock(&tid_agg_rx->reorder_lock);
2736 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2737 spin_unlock(&tid_agg_rx->reorder_lock);
2739 ieee80211_rx_handlers(&rx);
2742 /* main receive path */
2744 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2745 struct ieee80211_hdr *hdr)
2747 struct ieee80211_sub_if_data *sdata = rx->sdata;
2748 struct sk_buff *skb = rx->skb;
2749 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2750 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2751 int multicast = is_multicast_ether_addr(hdr->addr1);
2753 switch (sdata->vif.type) {
2754 case NL80211_IFTYPE_STATION:
2755 if (!bssid && !sdata->u.mgd.use_4addr)
2758 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2759 if (!(sdata->dev->flags & IFF_PROMISC) ||
2760 sdata->u.mgd.use_4addr)
2762 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2765 case NL80211_IFTYPE_ADHOC:
2768 if (ieee80211_is_beacon(hdr->frame_control)) {
2771 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2772 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2774 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2775 } else if (!multicast &&
2776 compare_ether_addr(sdata->vif.addr,
2778 if (!(sdata->dev->flags & IFF_PROMISC))
2780 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2781 } else if (!rx->sta) {
2783 if (status->flag & RX_FLAG_HT)
2784 rate_idx = 0; /* TODO: HT rates */
2786 rate_idx = status->rate_idx;
2787 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2788 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2791 case NL80211_IFTYPE_MESH_POINT:
2793 compare_ether_addr(sdata->vif.addr,
2795 if (!(sdata->dev->flags & IFF_PROMISC))
2798 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2801 case NL80211_IFTYPE_AP_VLAN:
2802 case NL80211_IFTYPE_AP:
2804 if (compare_ether_addr(sdata->vif.addr,
2807 } else if (!ieee80211_bssid_match(bssid,
2809 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2810 !ieee80211_is_beacon(hdr->frame_control) &&
2811 !(ieee80211_is_action(hdr->frame_control) &&
2814 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2817 case NL80211_IFTYPE_WDS:
2818 if (bssid || !ieee80211_is_data(hdr->frame_control))
2820 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2824 /* should never get here */
2833 * This function returns whether or not the SKB
2834 * was destined for RX processing or not, which,
2835 * if consume is true, is equivalent to whether
2836 * or not the skb was consumed.
2838 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2839 struct sk_buff *skb, bool consume)
2841 struct ieee80211_local *local = rx->local;
2842 struct ieee80211_sub_if_data *sdata = rx->sdata;
2843 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2844 struct ieee80211_hdr *hdr = (void *)skb->data;
2848 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2849 prepares = prepare_for_handlers(rx, hdr);
2855 skb = skb_copy(skb, GFP_ATOMIC);
2857 if (net_ratelimit())
2858 wiphy_debug(local->hw.wiphy,
2859 "failed to copy skb for %s\n",
2867 ieee80211_invoke_rx_handlers(rx);
2872 * This is the actual Rx frames handler. as it blongs to Rx path it must
2873 * be called with rcu_read_lock protection.
2875 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2876 struct sk_buff *skb)
2878 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2879 struct ieee80211_local *local = hw_to_local(hw);
2880 struct ieee80211_sub_if_data *sdata;
2881 struct ieee80211_hdr *hdr;
2883 struct ieee80211_rx_data rx;
2884 struct ieee80211_sub_if_data *prev;
2885 struct sta_info *sta, *tmp, *prev_sta;
2888 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2889 memset(&rx, 0, sizeof(rx));
2893 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2894 local->dot11ReceivedFragmentCount++;
2896 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2897 test_bit(SCAN_SW_SCANNING, &local->scanning)))
2898 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2900 if (ieee80211_is_mgmt(fc))
2901 err = skb_linearize(skb);
2903 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2910 hdr = (struct ieee80211_hdr *)skb->data;
2911 ieee80211_parse_qos(&rx);
2912 ieee80211_verify_alignment(&rx);
2914 if (ieee80211_is_data(fc)) {
2917 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
2924 rx.sdata = prev_sta->sdata;
2925 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2932 rx.sdata = prev_sta->sdata;
2934 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2942 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2943 if (!ieee80211_sdata_running(sdata))
2946 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2947 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2951 * frame is destined for this interface, but if it's
2952 * not also for the previous one we handle that after
2953 * the loop to avoid copying the SKB once too much
2961 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
2963 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2969 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
2972 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2981 * This is the receive path handler. It is called by a low level driver when an
2982 * 802.11 MPDU is received from the hardware.
2984 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2986 struct ieee80211_local *local = hw_to_local(hw);
2987 struct ieee80211_rate *rate = NULL;
2988 struct ieee80211_supported_band *sband;
2989 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2991 WARN_ON_ONCE(softirq_count() == 0);
2993 if (WARN_ON(status->band < 0 ||
2994 status->band >= IEEE80211_NUM_BANDS))
2997 sband = local->hw.wiphy->bands[status->band];
2998 if (WARN_ON(!sband))
3002 * If we're suspending, it is possible although not too likely
3003 * that we'd be receiving frames after having already partially
3004 * quiesced the stack. We can't process such frames then since
3005 * that might, for example, cause stations to be added or other
3006 * driver callbacks be invoked.
3008 if (unlikely(local->quiescing || local->suspended))
3012 * The same happens when we're not even started,
3013 * but that's worth a warning.
3015 if (WARN_ON(!local->started))
3018 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3020 * Validate the rate, unless a PLCP error means that
3021 * we probably can't have a valid rate here anyway.
3024 if (status->flag & RX_FLAG_HT) {
3026 * rate_idx is MCS index, which can be [0-76]
3029 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3031 * Anything else would be some sort of driver or
3032 * hardware error. The driver should catch hardware
3035 if (WARN((status->rate_idx < 0 ||
3036 status->rate_idx > 76),
3037 "Rate marked as an HT rate but passed "
3038 "status->rate_idx is not "
3039 "an MCS index [0-76]: %d (0x%02x)\n",
3044 if (WARN_ON(status->rate_idx < 0 ||
3045 status->rate_idx >= sband->n_bitrates))
3047 rate = &sband->bitrates[status->rate_idx];
3051 status->rx_flags = 0;
3054 * key references and virtual interfaces are protected using RCU
3055 * and this requires that we are in a read-side RCU section during
3056 * receive processing
3061 * Frames with failed FCS/PLCP checksum are not returned,
3062 * all other frames are returned without radiotap header
3063 * if it was previously present.
3064 * Also, frames with less than 16 bytes are dropped.
3066 skb = ieee80211_rx_monitor(local, skb, rate);
3072 ieee80211_tpt_led_trig_rx(local,
3073 ((struct ieee80211_hdr *)skb->data)->frame_control,
3075 __ieee80211_rx_handle_packet(hw, skb);
3083 EXPORT_SYMBOL(ieee80211_rx);
3085 /* This is a version of the rx handler that can be called from hard irq
3086 * context. Post the skb on the queue and schedule the tasklet */
3087 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3089 struct ieee80211_local *local = hw_to_local(hw);
3091 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3093 skb->pkt_type = IEEE80211_RX_MSG;
3094 skb_queue_tail(&local->skb_queue, skb);
3095 tasklet_schedule(&local->tasklet);
3097 EXPORT_SYMBOL(ieee80211_rx_irqsafe);