2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <linux/export.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
22 #include <asm/unaligned.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
35 * monitor mode reception
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
45 __pskb_trim(skb, skb->len - FCS_LEN);
57 static inline int should_drop_frame(struct sk_buff *skb,
60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
61 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
64 RX_FLAG_FAILED_PLCP_CRC |
65 RX_FLAG_AMPDU_IS_ZEROLEN))
67 if (unlikely(skb->len < 16 + present_fcs_len))
69 if (ieee80211_is_ctl(hdr->frame_control) &&
70 !ieee80211_is_pspoll(hdr->frame_control) &&
71 !ieee80211_is_back_req(hdr->frame_control))
77 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
78 struct ieee80211_rx_status *status)
82 /* always present fields */
83 len = sizeof(struct ieee80211_radiotap_header) + 9;
85 if (status->flag & RX_FLAG_MACTIME_MPDU)
87 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
90 if (len & 1) /* padding for RX_FLAGS if necessary */
93 if (status->flag & RX_FLAG_HT) /* HT info */
96 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
107 * ieee80211_add_rx_radiotap_header - add radiotap header
109 * add a radiotap header containing all the fields which the hardware provided.
112 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
114 struct ieee80211_rate *rate,
115 int rtap_len, bool has_fcs)
117 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
118 struct ieee80211_radiotap_header *rthdr;
122 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
123 memset(rthdr, 0, rtap_len);
125 /* radiotap header, set always present flags */
127 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
128 (1 << IEEE80211_RADIOTAP_CHANNEL) |
129 (1 << IEEE80211_RADIOTAP_ANTENNA) |
130 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
131 rthdr->it_len = cpu_to_le16(rtap_len);
133 pos = (unsigned char *)(rthdr+1);
135 /* the order of the following fields is important */
137 /* IEEE80211_RADIOTAP_TSFT */
138 if (status->flag & RX_FLAG_MACTIME_MPDU) {
139 put_unaligned_le64(status->mactime, pos);
141 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
145 /* IEEE80211_RADIOTAP_FLAGS */
146 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
147 *pos |= IEEE80211_RADIOTAP_F_FCS;
148 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
149 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
150 if (status->flag & RX_FLAG_SHORTPRE)
151 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
154 /* IEEE80211_RADIOTAP_RATE */
155 if (!rate || status->flag & RX_FLAG_HT) {
157 * Without rate information don't add it. If we have,
158 * MCS information is a separate field in radiotap,
159 * added below. The byte here is needed as padding
160 * for the channel though, so initialise it to 0.
164 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
165 *pos = rate->bitrate / 5;
169 /* IEEE80211_RADIOTAP_CHANNEL */
170 put_unaligned_le16(status->freq, pos);
172 if (status->band == IEEE80211_BAND_5GHZ)
173 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
175 else if (status->flag & RX_FLAG_HT)
176 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
178 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
179 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
182 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
185 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
188 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
189 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
190 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
191 *pos = status->signal;
193 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
197 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
199 /* IEEE80211_RADIOTAP_ANTENNA */
200 *pos = status->antenna;
203 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
205 /* IEEE80211_RADIOTAP_RX_FLAGS */
206 /* ensure 2 byte alignment for the 2 byte field as required */
207 if ((pos - (u8 *)rthdr) & 1)
209 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
210 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
211 put_unaligned_le16(rx_flags, pos);
214 if (status->flag & RX_FLAG_HT) {
215 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
216 *pos++ = local->hw.radiotap_mcs_details;
218 if (status->flag & RX_FLAG_SHORT_GI)
219 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
220 if (status->flag & RX_FLAG_40MHZ)
221 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
222 if (status->flag & RX_FLAG_HT_GF)
223 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
225 *pos++ = status->rate_idx;
228 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
231 /* ensure 4 byte alignment */
232 while ((pos - (u8 *)rthdr) & 3)
235 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
236 put_unaligned_le32(status->ampdu_reference, pos);
238 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
239 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
240 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
241 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
242 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
243 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
244 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
245 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
246 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
247 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
248 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
249 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
250 put_unaligned_le16(flags, pos);
252 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
253 *pos++ = status->ampdu_delimiter_crc;
261 * This function copies a received frame to all monitor interfaces and
262 * returns a cleaned-up SKB that no longer includes the FCS nor the
263 * radiotap header the driver might have added.
265 static struct sk_buff *
266 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
267 struct ieee80211_rate *rate)
269 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
270 struct ieee80211_sub_if_data *sdata;
272 struct sk_buff *skb, *skb2;
273 struct net_device *prev_dev = NULL;
274 int present_fcs_len = 0;
277 * First, we may need to make a copy of the skb because
278 * (1) we need to modify it for radiotap (if not present), and
279 * (2) the other RX handlers will modify the skb we got.
281 * We don't need to, of course, if we aren't going to return
282 * the SKB because it has a bad FCS/PLCP checksum.
285 /* room for the radiotap header based on driver features */
286 needed_headroom = ieee80211_rx_radiotap_len(local, status);
288 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
289 present_fcs_len = FCS_LEN;
291 /* make sure hdr->frame_control is on the linear part */
292 if (!pskb_may_pull(origskb, 2)) {
293 dev_kfree_skb(origskb);
297 if (!local->monitors) {
298 if (should_drop_frame(origskb, present_fcs_len)) {
299 dev_kfree_skb(origskb);
303 return remove_monitor_info(local, origskb);
306 if (should_drop_frame(origskb, present_fcs_len)) {
307 /* only need to expand headroom if necessary */
312 * This shouldn't trigger often because most devices have an
313 * RX header they pull before we get here, and that should
314 * be big enough for our radiotap information. We should
315 * probably export the length to drivers so that we can have
316 * them allocate enough headroom to start with.
318 if (skb_headroom(skb) < needed_headroom &&
319 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
325 * Need to make a copy and possibly remove radiotap header
326 * and FCS from the original.
328 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
330 origskb = remove_monitor_info(local, origskb);
336 /* prepend radiotap information */
337 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
340 skb_reset_mac_header(skb);
341 skb->ip_summed = CHECKSUM_UNNECESSARY;
342 skb->pkt_type = PACKET_OTHERHOST;
343 skb->protocol = htons(ETH_P_802_2);
345 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
346 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
349 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
352 if (!ieee80211_sdata_running(sdata))
356 skb2 = skb_clone(skb, GFP_ATOMIC);
358 skb2->dev = prev_dev;
359 netif_receive_skb(skb2);
363 prev_dev = sdata->dev;
364 sdata->dev->stats.rx_packets++;
365 sdata->dev->stats.rx_bytes += skb->len;
370 netif_receive_skb(skb);
378 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
381 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
382 int tid, seqno_idx, security_idx;
384 /* does the frame have a qos control field? */
385 if (ieee80211_is_data_qos(hdr->frame_control)) {
386 u8 *qc = ieee80211_get_qos_ctl(hdr);
387 /* frame has qos control */
388 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
389 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
390 status->rx_flags |= IEEE80211_RX_AMSDU;
396 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
398 * Sequence numbers for management frames, QoS data
399 * frames with a broadcast/multicast address in the
400 * Address 1 field, and all non-QoS data frames sent
401 * by QoS STAs are assigned using an additional single
402 * modulo-4096 counter, [...]
404 * We also use that counter for non-QoS STAs.
406 seqno_idx = NUM_RX_DATA_QUEUES;
408 if (ieee80211_is_mgmt(hdr->frame_control))
409 security_idx = NUM_RX_DATA_QUEUES;
413 rx->seqno_idx = seqno_idx;
414 rx->security_idx = security_idx;
415 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
416 * For now, set skb->priority to 0 for other cases. */
417 rx->skb->priority = (tid > 7) ? 0 : tid;
421 * DOC: Packet alignment
423 * Drivers always need to pass packets that are aligned to two-byte boundaries
426 * Additionally, should, if possible, align the payload data in a way that
427 * guarantees that the contained IP header is aligned to a four-byte
428 * boundary. In the case of regular frames, this simply means aligning the
429 * payload to a four-byte boundary (because either the IP header is directly
430 * contained, or IV/RFC1042 headers that have a length divisible by four are
431 * in front of it). If the payload data is not properly aligned and the
432 * architecture doesn't support efficient unaligned operations, mac80211
433 * will align the data.
435 * With A-MSDU frames, however, the payload data address must yield two modulo
436 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
437 * push the IP header further back to a multiple of four again. Thankfully, the
438 * specs were sane enough this time around to require padding each A-MSDU
439 * subframe to a length that is a multiple of four.
441 * Padding like Atheros hardware adds which is between the 802.11 header and
442 * the payload is not supported, the driver is required to move the 802.11
443 * header to be directly in front of the payload in that case.
445 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
447 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
448 WARN_ONCE((unsigned long)rx->skb->data & 1,
449 "unaligned packet at 0x%p\n", rx->skb->data);
456 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
458 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
460 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
463 return ieee80211_is_robust_mgmt_frame(hdr);
467 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
469 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
471 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
474 return ieee80211_is_robust_mgmt_frame(hdr);
478 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
479 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
481 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
482 struct ieee80211_mmie *mmie;
484 if (skb->len < 24 + sizeof(*mmie) ||
485 !is_multicast_ether_addr(hdr->da))
488 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
489 return -1; /* not a robust management frame */
491 mmie = (struct ieee80211_mmie *)
492 (skb->data + skb->len - sizeof(*mmie));
493 if (mmie->element_id != WLAN_EID_MMIE ||
494 mmie->length != sizeof(*mmie) - 2)
497 return le16_to_cpu(mmie->key_id);
501 static ieee80211_rx_result
502 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
504 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
505 char *dev_addr = rx->sdata->vif.addr;
507 if (ieee80211_is_data(hdr->frame_control)) {
508 if (is_multicast_ether_addr(hdr->addr1)) {
509 if (ieee80211_has_tods(hdr->frame_control) ||
510 !ieee80211_has_fromds(hdr->frame_control))
511 return RX_DROP_MONITOR;
512 if (ether_addr_equal(hdr->addr3, dev_addr))
513 return RX_DROP_MONITOR;
515 if (!ieee80211_has_a4(hdr->frame_control))
516 return RX_DROP_MONITOR;
517 if (ether_addr_equal(hdr->addr4, dev_addr))
518 return RX_DROP_MONITOR;
522 /* If there is not an established peer link and this is not a peer link
523 * establisment frame, beacon or probe, drop the frame.
526 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
527 struct ieee80211_mgmt *mgmt;
529 if (!ieee80211_is_mgmt(hdr->frame_control))
530 return RX_DROP_MONITOR;
532 if (ieee80211_is_action(hdr->frame_control)) {
535 /* make sure category field is present */
536 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
537 return RX_DROP_MONITOR;
539 mgmt = (struct ieee80211_mgmt *)hdr;
540 category = mgmt->u.action.category;
541 if (category != WLAN_CATEGORY_MESH_ACTION &&
542 category != WLAN_CATEGORY_SELF_PROTECTED)
543 return RX_DROP_MONITOR;
547 if (ieee80211_is_probe_req(hdr->frame_control) ||
548 ieee80211_is_probe_resp(hdr->frame_control) ||
549 ieee80211_is_beacon(hdr->frame_control) ||
550 ieee80211_is_auth(hdr->frame_control))
553 return RX_DROP_MONITOR;
560 #define SEQ_MODULO 0x1000
561 #define SEQ_MASK 0xfff
563 static inline int seq_less(u16 sq1, u16 sq2)
565 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
568 static inline u16 seq_inc(u16 sq)
570 return (sq + 1) & SEQ_MASK;
573 static inline u16 seq_sub(u16 sq1, u16 sq2)
575 return (sq1 - sq2) & SEQ_MASK;
579 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
580 struct tid_ampdu_rx *tid_agg_rx,
583 struct ieee80211_local *local = sdata->local;
584 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
585 struct ieee80211_rx_status *status;
587 lockdep_assert_held(&tid_agg_rx->reorder_lock);
592 /* release the frame from the reorder ring buffer */
593 tid_agg_rx->stored_mpdu_num--;
594 tid_agg_rx->reorder_buf[index] = NULL;
595 status = IEEE80211_SKB_RXCB(skb);
596 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
597 skb_queue_tail(&local->rx_skb_queue, skb);
600 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
603 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
604 struct tid_ampdu_rx *tid_agg_rx,
609 lockdep_assert_held(&tid_agg_rx->reorder_lock);
611 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
612 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
613 tid_agg_rx->buf_size;
614 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
619 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
620 * the skb was added to the buffer longer than this time ago, the earlier
621 * frames that have not yet been received are assumed to be lost and the skb
622 * can be released for processing. This may also release other skb's from the
623 * reorder buffer if there are no additional gaps between the frames.
625 * Callers must hold tid_agg_rx->reorder_lock.
627 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
629 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
630 struct tid_ampdu_rx *tid_agg_rx)
634 lockdep_assert_held(&tid_agg_rx->reorder_lock);
636 /* release the buffer until next missing frame */
637 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
638 tid_agg_rx->buf_size;
639 if (!tid_agg_rx->reorder_buf[index] &&
640 tid_agg_rx->stored_mpdu_num) {
642 * No buffers ready to be released, but check whether any
643 * frames in the reorder buffer have timed out.
646 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
647 j = (j + 1) % tid_agg_rx->buf_size) {
648 if (!tid_agg_rx->reorder_buf[j]) {
653 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
654 HT_RX_REORDER_BUF_TIMEOUT))
655 goto set_release_timer;
657 ht_dbg_ratelimited(sdata,
658 "release an RX reorder frame due to timeout on earlier frames\n");
659 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
662 * Increment the head seq# also for the skipped slots.
664 tid_agg_rx->head_seq_num =
665 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
668 } else while (tid_agg_rx->reorder_buf[index]) {
669 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
670 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
671 tid_agg_rx->buf_size;
674 if (tid_agg_rx->stored_mpdu_num) {
675 j = index = seq_sub(tid_agg_rx->head_seq_num,
676 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
678 for (; j != (index - 1) % tid_agg_rx->buf_size;
679 j = (j + 1) % tid_agg_rx->buf_size) {
680 if (tid_agg_rx->reorder_buf[j])
686 mod_timer(&tid_agg_rx->reorder_timer,
687 tid_agg_rx->reorder_time[j] + 1 +
688 HT_RX_REORDER_BUF_TIMEOUT);
690 del_timer(&tid_agg_rx->reorder_timer);
695 * As this function belongs to the RX path it must be under
696 * rcu_read_lock protection. It returns false if the frame
697 * can be processed immediately, true if it was consumed.
699 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
700 struct tid_ampdu_rx *tid_agg_rx,
703 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
704 u16 sc = le16_to_cpu(hdr->seq_ctrl);
705 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
706 u16 head_seq_num, buf_size;
710 spin_lock(&tid_agg_rx->reorder_lock);
712 buf_size = tid_agg_rx->buf_size;
713 head_seq_num = tid_agg_rx->head_seq_num;
715 /* frame with out of date sequence number */
716 if (seq_less(mpdu_seq_num, head_seq_num)) {
722 * If frame the sequence number exceeds our buffering window
723 * size release some previous frames to make room for this one.
725 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
726 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
727 /* release stored frames up to new head to stack */
728 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
732 /* Now the new frame is always in the range of the reordering buffer */
734 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
736 /* check if we already stored this frame */
737 if (tid_agg_rx->reorder_buf[index]) {
743 * If the current MPDU is in the right order and nothing else
744 * is stored we can process it directly, no need to buffer it.
745 * If it is first but there's something stored, we may be able
746 * to release frames after this one.
748 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
749 tid_agg_rx->stored_mpdu_num == 0) {
750 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
755 /* put the frame in the reordering buffer */
756 tid_agg_rx->reorder_buf[index] = skb;
757 tid_agg_rx->reorder_time[index] = jiffies;
758 tid_agg_rx->stored_mpdu_num++;
759 ieee80211_sta_reorder_release(sdata, tid_agg_rx);
762 spin_unlock(&tid_agg_rx->reorder_lock);
767 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
768 * true if the MPDU was buffered, false if it should be processed.
770 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
772 struct sk_buff *skb = rx->skb;
773 struct ieee80211_local *local = rx->local;
774 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
775 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
776 struct sta_info *sta = rx->sta;
777 struct tid_ampdu_rx *tid_agg_rx;
781 if (!ieee80211_is_data_qos(hdr->frame_control))
785 * filter the QoS data rx stream according to
786 * STA/TID and check if this STA/TID is on aggregation
792 ack_policy = *ieee80211_get_qos_ctl(hdr) &
793 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
794 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
796 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
800 /* qos null data frames are excluded */
801 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
804 /* not part of a BA session */
805 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
806 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
809 /* not actually part of this BA session */
810 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
813 /* new, potentially un-ordered, ampdu frame - process it */
815 /* reset session timer */
816 if (tid_agg_rx->timeout)
817 tid_agg_rx->last_rx = jiffies;
819 /* if this mpdu is fragmented - terminate rx aggregation session */
820 sc = le16_to_cpu(hdr->seq_ctrl);
821 if (sc & IEEE80211_SCTL_FRAG) {
822 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
823 skb_queue_tail(&rx->sdata->skb_queue, skb);
824 ieee80211_queue_work(&local->hw, &rx->sdata->work);
829 * No locking needed -- we will only ever process one
830 * RX packet at a time, and thus own tid_agg_rx. All
831 * other code manipulating it needs to (and does) make
832 * sure that we cannot get to it any more before doing
835 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb))
839 skb_queue_tail(&local->rx_skb_queue, skb);
842 static ieee80211_rx_result debug_noinline
843 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
845 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
846 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
848 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
849 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
850 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
851 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
853 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
854 rx->local->dot11FrameDuplicateCount++;
855 rx->sta->num_duplicates++;
857 return RX_DROP_UNUSABLE;
859 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
862 if (unlikely(rx->skb->len < 16)) {
863 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
864 return RX_DROP_MONITOR;
867 /* Drop disallowed frame classes based on STA auth/assoc state;
868 * IEEE 802.11, Chap 5.5.
870 * mac80211 filters only based on association state, i.e. it drops
871 * Class 3 frames from not associated stations. hostapd sends
872 * deauth/disassoc frames when needed. In addition, hostapd is
873 * responsible for filtering on both auth and assoc states.
876 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
877 return ieee80211_rx_mesh_check(rx);
879 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
880 ieee80211_is_pspoll(hdr->frame_control)) &&
881 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
882 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
883 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
885 * accept port control frames from the AP even when it's not
886 * yet marked ASSOC to prevent a race where we don't set the
887 * assoc bit quickly enough before it sends the first frame
889 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
890 ieee80211_is_data_present(hdr->frame_control)) {
894 hdrlen = ieee80211_hdrlen(hdr->frame_control);
896 if (rx->skb->len < hdrlen + 8)
897 return RX_DROP_MONITOR;
899 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
900 if (ethertype == rx->sdata->control_port_protocol)
904 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
905 cfg80211_rx_spurious_frame(rx->sdata->dev,
908 return RX_DROP_UNUSABLE;
910 return RX_DROP_MONITOR;
917 static ieee80211_rx_result debug_noinline
918 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
920 struct sk_buff *skb = rx->skb;
921 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
922 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
925 ieee80211_rx_result result = RX_DROP_UNUSABLE;
926 struct ieee80211_key *sta_ptk = NULL;
927 int mmie_keyidx = -1;
933 * There are four types of keys:
935 * - IGTK (group keys for management frames)
936 * - PTK (pairwise keys)
937 * - STK (station-to-station pairwise keys)
939 * When selecting a key, we have to distinguish between multicast
940 * (including broadcast) and unicast frames, the latter can only
941 * use PTKs and STKs while the former always use GTKs and IGTKs.
942 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
943 * unicast frames can also use key indices like GTKs. Hence, if we
944 * don't have a PTK/STK we check the key index for a WEP key.
946 * Note that in a regular BSS, multicast frames are sent by the
947 * AP only, associated stations unicast the frame to the AP first
948 * which then multicasts it on their behalf.
950 * There is also a slight problem in IBSS mode: GTKs are negotiated
951 * with each station, that is something we don't currently handle.
952 * The spec seems to expect that one negotiates the same key with
953 * every station but there's no such requirement; VLANs could be
958 * No point in finding a key and decrypting if the frame is neither
959 * addressed to us nor a multicast frame.
961 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
964 /* start without a key */
968 sta_ptk = rcu_dereference(rx->sta->ptk);
970 fc = hdr->frame_control;
972 if (!ieee80211_has_protected(fc))
973 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
975 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
977 if ((status->flag & RX_FLAG_DECRYPTED) &&
978 (status->flag & RX_FLAG_IV_STRIPPED))
980 /* Skip decryption if the frame is not protected. */
981 if (!ieee80211_has_protected(fc))
983 } else if (mmie_keyidx >= 0) {
984 /* Broadcast/multicast robust management frame / BIP */
985 if ((status->flag & RX_FLAG_DECRYPTED) &&
986 (status->flag & RX_FLAG_IV_STRIPPED))
989 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
990 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
991 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
993 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
995 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
996 } else if (!ieee80211_has_protected(fc)) {
998 * The frame was not protected, so skip decryption. However, we
999 * need to set rx->key if there is a key that could have been
1000 * used so that the frame may be dropped if encryption would
1001 * have been expected.
1003 struct ieee80211_key *key = NULL;
1004 struct ieee80211_sub_if_data *sdata = rx->sdata;
1007 if (ieee80211_is_mgmt(fc) &&
1008 is_multicast_ether_addr(hdr->addr1) &&
1009 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1013 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1014 key = rcu_dereference(rx->sta->gtk[i]);
1020 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1021 key = rcu_dereference(sdata->keys[i]);
1033 * The device doesn't give us the IV so we won't be
1034 * able to look up the key. That's ok though, we
1035 * don't need to decrypt the frame, we just won't
1036 * be able to keep statistics accurate.
1037 * Except for key threshold notifications, should
1038 * we somehow allow the driver to tell us which key
1039 * the hardware used if this flag is set?
1041 if ((status->flag & RX_FLAG_DECRYPTED) &&
1042 (status->flag & RX_FLAG_IV_STRIPPED))
1045 hdrlen = ieee80211_hdrlen(fc);
1047 if (rx->skb->len < 8 + hdrlen)
1048 return RX_DROP_UNUSABLE; /* TODO: count this? */
1051 * no need to call ieee80211_wep_get_keyidx,
1052 * it verifies a bunch of things we've done already
1054 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1055 keyidx = keyid >> 6;
1057 /* check per-station GTK first, if multicast packet */
1058 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1059 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1061 /* if not found, try default key */
1063 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1066 * RSNA-protected unicast frames should always be
1067 * sent with pairwise or station-to-station keys,
1068 * but for WEP we allow using a key index as well.
1071 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1072 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1073 !is_multicast_ether_addr(hdr->addr1))
1079 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1080 return RX_DROP_MONITOR;
1082 rx->key->tx_rx_count++;
1083 /* TODO: add threshold stuff again */
1085 return RX_DROP_MONITOR;
1088 switch (rx->key->conf.cipher) {
1089 case WLAN_CIPHER_SUITE_WEP40:
1090 case WLAN_CIPHER_SUITE_WEP104:
1091 result = ieee80211_crypto_wep_decrypt(rx);
1093 case WLAN_CIPHER_SUITE_TKIP:
1094 result = ieee80211_crypto_tkip_decrypt(rx);
1096 case WLAN_CIPHER_SUITE_CCMP:
1097 result = ieee80211_crypto_ccmp_decrypt(rx);
1099 case WLAN_CIPHER_SUITE_AES_CMAC:
1100 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1104 * We can reach here only with HW-only algorithms
1105 * but why didn't it decrypt the frame?!
1107 return RX_DROP_UNUSABLE;
1110 /* the hdr variable is invalid after the decrypt handlers */
1112 /* either the frame has been decrypted or will be dropped */
1113 status->flag |= RX_FLAG_DECRYPTED;
1118 static ieee80211_rx_result debug_noinline
1119 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1121 struct ieee80211_local *local;
1122 struct ieee80211_hdr *hdr;
1123 struct sk_buff *skb;
1127 hdr = (struct ieee80211_hdr *) skb->data;
1129 if (!local->pspolling)
1132 if (!ieee80211_has_fromds(hdr->frame_control))
1133 /* this is not from AP */
1136 if (!ieee80211_is_data(hdr->frame_control))
1139 if (!ieee80211_has_moredata(hdr->frame_control)) {
1140 /* AP has no more frames buffered for us */
1141 local->pspolling = false;
1145 /* more data bit is set, let's request a new frame from the AP */
1146 ieee80211_send_pspoll(local, rx->sdata);
1151 static void ap_sta_ps_start(struct sta_info *sta)
1153 struct ieee80211_sub_if_data *sdata = sta->sdata;
1154 struct ieee80211_local *local = sdata->local;
1156 atomic_inc(&sdata->bss->num_sta_ps);
1157 set_sta_flag(sta, WLAN_STA_PS_STA);
1158 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1159 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1160 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1161 sta->sta.addr, sta->sta.aid);
1164 static void ap_sta_ps_end(struct sta_info *sta)
1166 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1167 sta->sta.addr, sta->sta.aid);
1169 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1170 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1171 sta->sta.addr, sta->sta.aid);
1175 ieee80211_sta_ps_deliver_wakeup(sta);
1178 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1180 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1183 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1185 /* Don't let the same PS state be set twice */
1186 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1187 if ((start && in_ps) || (!start && !in_ps))
1191 ap_sta_ps_start(sta_inf);
1193 ap_sta_ps_end(sta_inf);
1197 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1199 static ieee80211_rx_result debug_noinline
1200 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1202 struct ieee80211_sub_if_data *sdata = rx->sdata;
1203 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1204 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1207 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1210 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1211 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1215 * The device handles station powersave, so don't do anything about
1216 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1217 * it to mac80211 since they're handled.)
1219 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1223 * Don't do anything if the station isn't already asleep. In
1224 * the uAPSD case, the station will probably be marked asleep,
1225 * in the PS-Poll case the station must be confused ...
1227 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1230 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1231 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1232 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1233 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1235 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1238 /* Free PS Poll skb here instead of returning RX_DROP that would
1239 * count as an dropped frame. */
1240 dev_kfree_skb(rx->skb);
1243 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1244 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1245 ieee80211_has_pm(hdr->frame_control) &&
1246 (ieee80211_is_data_qos(hdr->frame_control) ||
1247 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1248 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1249 ac = ieee802_1d_to_ac[tid & 7];
1252 * If this AC is not trigger-enabled do nothing.
1254 * NB: This could/should check a separate bitmap of trigger-
1255 * enabled queues, but for now we only implement uAPSD w/o
1256 * TSPEC changes to the ACs, so they're always the same.
1258 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1261 /* if we are in a service period, do nothing */
1262 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1265 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1266 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1268 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1274 static ieee80211_rx_result debug_noinline
1275 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1277 struct sta_info *sta = rx->sta;
1278 struct sk_buff *skb = rx->skb;
1279 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1280 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1286 * Update last_rx only for IBSS packets which are for the current
1287 * BSSID to avoid keeping the current IBSS network alive in cases
1288 * where other STAs start using different BSSID.
1290 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1291 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1292 NL80211_IFTYPE_ADHOC);
1293 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid)) {
1294 sta->last_rx = jiffies;
1295 if (ieee80211_is_data(hdr->frame_control)) {
1296 sta->last_rx_rate_idx = status->rate_idx;
1297 sta->last_rx_rate_flag = status->flag;
1300 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1302 * Mesh beacons will update last_rx when if they are found to
1303 * match the current local configuration when processed.
1305 sta->last_rx = jiffies;
1306 if (ieee80211_is_data(hdr->frame_control)) {
1307 sta->last_rx_rate_idx = status->rate_idx;
1308 sta->last_rx_rate_flag = status->flag;
1312 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1315 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1316 ieee80211_sta_rx_notify(rx->sdata, hdr);
1318 sta->rx_fragments++;
1319 sta->rx_bytes += rx->skb->len;
1320 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1321 sta->last_signal = status->signal;
1322 ewma_add(&sta->avg_signal, -status->signal);
1326 * Change STA power saving mode only at the end of a frame
1327 * exchange sequence.
1329 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1330 !ieee80211_has_morefrags(hdr->frame_control) &&
1331 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1332 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1333 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1334 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1336 * Ignore doze->wake transitions that are
1337 * indicated by non-data frames, the standard
1338 * is unclear here, but for example going to
1339 * PS mode and then scanning would cause a
1340 * doze->wake transition for the probe request,
1341 * and that is clearly undesirable.
1343 if (ieee80211_is_data(hdr->frame_control) &&
1344 !ieee80211_has_pm(hdr->frame_control))
1347 if (ieee80211_has_pm(hdr->frame_control))
1348 ap_sta_ps_start(sta);
1353 * Drop (qos-)data::nullfunc frames silently, since they
1354 * are used only to control station power saving mode.
1356 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1357 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1358 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1361 * If we receive a 4-addr nullfunc frame from a STA
1362 * that was not moved to a 4-addr STA vlan yet send
1363 * the event to userspace and for older hostapd drop
1364 * the frame to the monitor interface.
1366 if (ieee80211_has_a4(hdr->frame_control) &&
1367 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1368 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1369 !rx->sdata->u.vlan.sta))) {
1370 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1371 cfg80211_rx_unexpected_4addr_frame(
1372 rx->sdata->dev, sta->sta.addr,
1374 return RX_DROP_MONITOR;
1377 * Update counter and free packet here to avoid
1378 * counting this as a dropped packed.
1381 dev_kfree_skb(rx->skb);
1386 } /* ieee80211_rx_h_sta_process */
1388 static inline struct ieee80211_fragment_entry *
1389 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1390 unsigned int frag, unsigned int seq, int rx_queue,
1391 struct sk_buff **skb)
1393 struct ieee80211_fragment_entry *entry;
1396 idx = sdata->fragment_next;
1397 entry = &sdata->fragments[sdata->fragment_next++];
1398 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1399 sdata->fragment_next = 0;
1401 if (!skb_queue_empty(&entry->skb_list))
1402 __skb_queue_purge(&entry->skb_list);
1404 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1406 entry->first_frag_time = jiffies;
1408 entry->rx_queue = rx_queue;
1409 entry->last_frag = frag;
1411 entry->extra_len = 0;
1416 static inline struct ieee80211_fragment_entry *
1417 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1418 unsigned int frag, unsigned int seq,
1419 int rx_queue, struct ieee80211_hdr *hdr)
1421 struct ieee80211_fragment_entry *entry;
1424 idx = sdata->fragment_next;
1425 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1426 struct ieee80211_hdr *f_hdr;
1430 idx = IEEE80211_FRAGMENT_MAX - 1;
1432 entry = &sdata->fragments[idx];
1433 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1434 entry->rx_queue != rx_queue ||
1435 entry->last_frag + 1 != frag)
1438 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1441 * Check ftype and addresses are equal, else check next fragment
1443 if (((hdr->frame_control ^ f_hdr->frame_control) &
1444 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1445 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1446 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1449 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1450 __skb_queue_purge(&entry->skb_list);
1459 static ieee80211_rx_result debug_noinline
1460 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1462 struct ieee80211_hdr *hdr;
1465 unsigned int frag, seq;
1466 struct ieee80211_fragment_entry *entry;
1467 struct sk_buff *skb;
1468 struct ieee80211_rx_status *status;
1470 hdr = (struct ieee80211_hdr *)rx->skb->data;
1471 fc = hdr->frame_control;
1473 if (ieee80211_is_ctl(fc))
1476 sc = le16_to_cpu(hdr->seq_ctrl);
1477 frag = sc & IEEE80211_SCTL_FRAG;
1479 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1480 is_multicast_ether_addr(hdr->addr1))) {
1481 /* not fragmented */
1484 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1486 if (skb_linearize(rx->skb))
1487 return RX_DROP_UNUSABLE;
1490 * skb_linearize() might change the skb->data and
1491 * previously cached variables (in this case, hdr) need to
1492 * be refreshed with the new data.
1494 hdr = (struct ieee80211_hdr *)rx->skb->data;
1495 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1498 /* This is the first fragment of a new frame. */
1499 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1500 rx->seqno_idx, &(rx->skb));
1501 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1502 ieee80211_has_protected(fc)) {
1503 int queue = rx->security_idx;
1504 /* Store CCMP PN so that we can verify that the next
1505 * fragment has a sequential PN value. */
1507 memcpy(entry->last_pn,
1508 rx->key->u.ccmp.rx_pn[queue],
1514 /* This is a fragment for a frame that should already be pending in
1515 * fragment cache. Add this fragment to the end of the pending entry.
1517 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1518 rx->seqno_idx, hdr);
1520 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1521 return RX_DROP_MONITOR;
1524 /* Verify that MPDUs within one MSDU have sequential PN values.
1525 * (IEEE 802.11i, 8.3.3.4.5) */
1528 u8 pn[CCMP_PN_LEN], *rpn;
1530 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1531 return RX_DROP_UNUSABLE;
1532 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1533 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1538 queue = rx->security_idx;
1539 rpn = rx->key->u.ccmp.rx_pn[queue];
1540 if (memcmp(pn, rpn, CCMP_PN_LEN))
1541 return RX_DROP_UNUSABLE;
1542 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1545 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1546 __skb_queue_tail(&entry->skb_list, rx->skb);
1547 entry->last_frag = frag;
1548 entry->extra_len += rx->skb->len;
1549 if (ieee80211_has_morefrags(fc)) {
1554 rx->skb = __skb_dequeue(&entry->skb_list);
1555 if (skb_tailroom(rx->skb) < entry->extra_len) {
1556 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1557 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1559 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1560 __skb_queue_purge(&entry->skb_list);
1561 return RX_DROP_UNUSABLE;
1564 while ((skb = __skb_dequeue(&entry->skb_list))) {
1565 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1569 /* Complete frame has been reassembled - process it now */
1570 status = IEEE80211_SKB_RXCB(rx->skb);
1571 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1575 rx->sta->rx_packets++;
1576 if (is_multicast_ether_addr(hdr->addr1))
1577 rx->local->dot11MulticastReceivedFrameCount++;
1579 ieee80211_led_rx(rx->local);
1584 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1586 if (unlikely(!rx->sta ||
1587 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1594 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1596 struct sk_buff *skb = rx->skb;
1597 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1600 * Pass through unencrypted frames if the hardware has
1601 * decrypted them already.
1603 if (status->flag & RX_FLAG_DECRYPTED)
1606 /* Drop unencrypted frames if key is set. */
1607 if (unlikely(!ieee80211_has_protected(fc) &&
1608 !ieee80211_is_nullfunc(fc) &&
1609 ieee80211_is_data(fc) &&
1610 (rx->key || rx->sdata->drop_unencrypted)))
1617 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1619 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1620 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1621 __le16 fc = hdr->frame_control;
1624 * Pass through unencrypted frames if the hardware has
1625 * decrypted them already.
1627 if (status->flag & RX_FLAG_DECRYPTED)
1630 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1631 if (unlikely(!ieee80211_has_protected(fc) &&
1632 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1634 if (ieee80211_is_deauth(fc))
1635 cfg80211_send_unprot_deauth(rx->sdata->dev,
1638 else if (ieee80211_is_disassoc(fc))
1639 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1644 /* BIP does not use Protected field, so need to check MMIE */
1645 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1646 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1647 if (ieee80211_is_deauth(fc))
1648 cfg80211_send_unprot_deauth(rx->sdata->dev,
1651 else if (ieee80211_is_disassoc(fc))
1652 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1658 * When using MFP, Action frames are not allowed prior to
1659 * having configured keys.
1661 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1662 ieee80211_is_robust_mgmt_frame(
1663 (struct ieee80211_hdr *) rx->skb->data)))
1671 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1673 struct ieee80211_sub_if_data *sdata = rx->sdata;
1674 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1675 bool check_port_control = false;
1676 struct ethhdr *ehdr;
1679 *port_control = false;
1680 if (ieee80211_has_a4(hdr->frame_control) &&
1681 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1684 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1685 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1687 if (!sdata->u.mgd.use_4addr)
1690 check_port_control = true;
1693 if (is_multicast_ether_addr(hdr->addr1) &&
1694 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1697 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1701 ehdr = (struct ethhdr *) rx->skb->data;
1702 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1703 *port_control = true;
1704 else if (check_port_control)
1711 * requires that rx->skb is a frame with ethernet header
1713 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1715 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1716 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1717 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1720 * Allow EAPOL frames to us/the PAE group address regardless
1721 * of whether the frame was encrypted or not.
1723 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1724 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1725 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1728 if (ieee80211_802_1x_port_control(rx) ||
1729 ieee80211_drop_unencrypted(rx, fc))
1736 * requires that rx->skb is a frame with ethernet header
1739 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1741 struct ieee80211_sub_if_data *sdata = rx->sdata;
1742 struct net_device *dev = sdata->dev;
1743 struct sk_buff *skb, *xmit_skb;
1744 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1745 struct sta_info *dsta;
1746 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1751 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1752 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1753 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1754 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1755 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1756 if (is_multicast_ether_addr(ehdr->h_dest)) {
1758 * send multicast frames both to higher layers in
1759 * local net stack and back to the wireless medium
1761 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1763 net_info_ratelimited("%s: failed to clone multicast frame\n",
1766 dsta = sta_info_get(sdata, skb->data);
1769 * The destination station is associated to
1770 * this AP (in this VLAN), so send the frame
1771 * directly to it and do not pass it to local
1781 int align __maybe_unused;
1783 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1785 * 'align' will only take the values 0 or 2 here
1786 * since all frames are required to be aligned
1787 * to 2-byte boundaries when being passed to
1788 * mac80211. That also explains the __skb_push()
1791 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1793 if (WARN_ON(skb_headroom(skb) < 3)) {
1797 u8 *data = skb->data;
1798 size_t len = skb_headlen(skb);
1800 memmove(skb->data, data, len);
1801 skb_set_tail_pointer(skb, len);
1807 /* deliver to local stack */
1808 skb->protocol = eth_type_trans(skb, dev);
1809 memset(skb->cb, 0, sizeof(skb->cb));
1810 netif_receive_skb(skb);
1816 * Send to wireless media and increase priority by 256 to
1817 * keep the received priority instead of reclassifying
1818 * the frame (see cfg80211_classify8021d).
1820 xmit_skb->priority += 256;
1821 xmit_skb->protocol = htons(ETH_P_802_3);
1822 skb_reset_network_header(xmit_skb);
1823 skb_reset_mac_header(xmit_skb);
1824 dev_queue_xmit(xmit_skb);
1828 static ieee80211_rx_result debug_noinline
1829 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1831 struct net_device *dev = rx->sdata->dev;
1832 struct sk_buff *skb = rx->skb;
1833 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1834 __le16 fc = hdr->frame_control;
1835 struct sk_buff_head frame_list;
1836 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1838 if (unlikely(!ieee80211_is_data(fc)))
1841 if (unlikely(!ieee80211_is_data_present(fc)))
1842 return RX_DROP_MONITOR;
1844 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1847 if (ieee80211_has_a4(hdr->frame_control) &&
1848 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1849 !rx->sdata->u.vlan.sta)
1850 return RX_DROP_UNUSABLE;
1852 if (is_multicast_ether_addr(hdr->addr1) &&
1853 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1854 rx->sdata->u.vlan.sta) ||
1855 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1856 rx->sdata->u.mgd.use_4addr)))
1857 return RX_DROP_UNUSABLE;
1860 __skb_queue_head_init(&frame_list);
1862 if (skb_linearize(skb))
1863 return RX_DROP_UNUSABLE;
1865 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1866 rx->sdata->vif.type,
1867 rx->local->hw.extra_tx_headroom, true);
1869 while (!skb_queue_empty(&frame_list)) {
1870 rx->skb = __skb_dequeue(&frame_list);
1872 if (!ieee80211_frame_allowed(rx, fc)) {
1873 dev_kfree_skb(rx->skb);
1876 dev->stats.rx_packets++;
1877 dev->stats.rx_bytes += rx->skb->len;
1879 ieee80211_deliver_skb(rx);
1885 #ifdef CONFIG_MAC80211_MESH
1886 static ieee80211_rx_result
1887 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1889 struct ieee80211_hdr *fwd_hdr, *hdr;
1890 struct ieee80211_tx_info *info;
1891 struct ieee80211s_hdr *mesh_hdr;
1892 struct sk_buff *skb = rx->skb, *fwd_skb;
1893 struct ieee80211_local *local = rx->local;
1894 struct ieee80211_sub_if_data *sdata = rx->sdata;
1895 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1896 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1897 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1900 hdr = (struct ieee80211_hdr *) skb->data;
1901 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1903 /* make sure fixed part of mesh header is there, also checks skb len */
1904 if (!pskb_may_pull(rx->skb, hdrlen + 6))
1905 return RX_DROP_MONITOR;
1907 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1909 /* make sure full mesh header is there, also checks skb len */
1910 if (!pskb_may_pull(rx->skb,
1911 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
1912 return RX_DROP_MONITOR;
1914 /* reload pointers */
1915 hdr = (struct ieee80211_hdr *) skb->data;
1916 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1918 /* frame is in RMC, don't forward */
1919 if (ieee80211_is_data(hdr->frame_control) &&
1920 is_multicast_ether_addr(hdr->addr1) &&
1921 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1922 return RX_DROP_MONITOR;
1924 if (!ieee80211_is_data(hdr->frame_control) ||
1925 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1929 return RX_DROP_MONITOR;
1931 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1932 struct mesh_path *mppath;
1936 if (is_multicast_ether_addr(hdr->addr1)) {
1937 mpp_addr = hdr->addr3;
1938 proxied_addr = mesh_hdr->eaddr1;
1939 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
1940 /* has_a4 already checked in ieee80211_rx_mesh_check */
1941 mpp_addr = hdr->addr4;
1942 proxied_addr = mesh_hdr->eaddr2;
1944 return RX_DROP_MONITOR;
1948 mppath = mpp_path_lookup(proxied_addr, sdata);
1950 mpp_path_add(proxied_addr, mpp_addr, sdata);
1952 spin_lock_bh(&mppath->state_lock);
1953 if (!ether_addr_equal(mppath->mpp, mpp_addr))
1954 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1955 spin_unlock_bh(&mppath->state_lock);
1960 /* Frame has reached destination. Don't forward */
1961 if (!is_multicast_ether_addr(hdr->addr1) &&
1962 ether_addr_equal(sdata->vif.addr, hdr->addr3))
1965 q = ieee80211_select_queue_80211(sdata, skb, hdr);
1966 if (ieee80211_queue_stopped(&local->hw, q)) {
1967 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
1968 return RX_DROP_MONITOR;
1970 skb_set_queue_mapping(skb, q);
1972 if (!--mesh_hdr->ttl) {
1973 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1977 if (!ifmsh->mshcfg.dot11MeshForwarding)
1980 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1982 net_info_ratelimited("%s: failed to clone mesh frame\n",
1987 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1988 info = IEEE80211_SKB_CB(fwd_skb);
1989 memset(info, 0, sizeof(*info));
1990 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1991 info->control.vif = &rx->sdata->vif;
1992 info->control.jiffies = jiffies;
1993 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1994 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1995 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1996 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1997 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1999 /* unable to resolve next hop */
2000 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
2001 0, reason, fwd_hdr->addr2, sdata);
2002 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2004 return RX_DROP_MONITOR;
2007 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2008 ieee80211_add_pending_skb(local, fwd_skb);
2010 if (is_multicast_ether_addr(hdr->addr1) ||
2011 sdata->dev->flags & IFF_PROMISC)
2014 return RX_DROP_MONITOR;
2018 static ieee80211_rx_result debug_noinline
2019 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2021 struct ieee80211_sub_if_data *sdata = rx->sdata;
2022 struct ieee80211_local *local = rx->local;
2023 struct net_device *dev = sdata->dev;
2024 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2025 __le16 fc = hdr->frame_control;
2029 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2032 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2033 return RX_DROP_MONITOR;
2036 * Send unexpected-4addr-frame event to hostapd. For older versions,
2037 * also drop the frame to cooked monitor interfaces.
2039 if (ieee80211_has_a4(hdr->frame_control) &&
2040 sdata->vif.type == NL80211_IFTYPE_AP) {
2042 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2043 cfg80211_rx_unexpected_4addr_frame(
2044 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2045 return RX_DROP_MONITOR;
2048 err = __ieee80211_data_to_8023(rx, &port_control);
2050 return RX_DROP_UNUSABLE;
2052 if (!ieee80211_frame_allowed(rx, fc))
2053 return RX_DROP_MONITOR;
2055 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2056 unlikely(port_control) && sdata->bss) {
2057 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2065 dev->stats.rx_packets++;
2066 dev->stats.rx_bytes += rx->skb->len;
2068 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2069 !is_multicast_ether_addr(
2070 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2071 (!local->scanning &&
2072 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2073 mod_timer(&local->dynamic_ps_timer, jiffies +
2074 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2077 ieee80211_deliver_skb(rx);
2082 static ieee80211_rx_result debug_noinline
2083 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2085 struct sk_buff *skb = rx->skb;
2086 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2087 struct tid_ampdu_rx *tid_agg_rx;
2091 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2094 if (ieee80211_is_back_req(bar->frame_control)) {
2096 __le16 control, start_seq_num;
2097 } __packed bar_data;
2100 return RX_DROP_MONITOR;
2102 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2103 &bar_data, sizeof(bar_data)))
2104 return RX_DROP_MONITOR;
2106 tid = le16_to_cpu(bar_data.control) >> 12;
2108 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2110 return RX_DROP_MONITOR;
2112 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2114 /* reset session timer */
2115 if (tid_agg_rx->timeout)
2116 mod_timer(&tid_agg_rx->session_timer,
2117 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2119 spin_lock(&tid_agg_rx->reorder_lock);
2120 /* release stored frames up to start of BAR */
2121 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2123 spin_unlock(&tid_agg_rx->reorder_lock);
2130 * After this point, we only want management frames,
2131 * so we can drop all remaining control frames to
2132 * cooked monitor interfaces.
2134 return RX_DROP_MONITOR;
2137 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2138 struct ieee80211_mgmt *mgmt,
2141 struct ieee80211_local *local = sdata->local;
2142 struct sk_buff *skb;
2143 struct ieee80211_mgmt *resp;
2145 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2146 /* Not to own unicast address */
2150 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2151 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2152 /* Not from the current AP or not associated yet. */
2156 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2157 /* Too short SA Query request frame */
2161 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2165 skb_reserve(skb, local->hw.extra_tx_headroom);
2166 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2167 memset(resp, 0, 24);
2168 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2169 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2170 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2171 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2172 IEEE80211_STYPE_ACTION);
2173 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2174 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2175 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2176 memcpy(resp->u.action.u.sa_query.trans_id,
2177 mgmt->u.action.u.sa_query.trans_id,
2178 WLAN_SA_QUERY_TR_ID_LEN);
2180 ieee80211_tx_skb(sdata, skb);
2183 static ieee80211_rx_result debug_noinline
2184 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2186 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2187 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2190 * From here on, look only at management frames.
2191 * Data and control frames are already handled,
2192 * and unknown (reserved) frames are useless.
2194 if (rx->skb->len < 24)
2195 return RX_DROP_MONITOR;
2197 if (!ieee80211_is_mgmt(mgmt->frame_control))
2198 return RX_DROP_MONITOR;
2200 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2201 ieee80211_is_beacon(mgmt->frame_control) &&
2202 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2205 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2206 sig = status->signal;
2208 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2209 rx->skb->data, rx->skb->len,
2210 status->freq, sig, 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_HT:
2247 /* reject HT action frames from stations not supporting HT */
2248 if (!rx->sta->sta.ht_cap.ht_supported)
2251 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2252 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2253 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2254 sdata->vif.type != NL80211_IFTYPE_AP &&
2255 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2258 /* verify action & smps_control are present */
2259 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2262 switch (mgmt->u.action.u.ht_smps.action) {
2263 case WLAN_HT_ACTION_SMPS: {
2264 struct ieee80211_supported_band *sband;
2267 /* convert to HT capability */
2268 switch (mgmt->u.action.u.ht_smps.smps_control) {
2269 case WLAN_HT_SMPS_CONTROL_DISABLED:
2270 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2272 case WLAN_HT_SMPS_CONTROL_STATIC:
2273 smps = WLAN_HT_CAP_SM_PS_STATIC;
2275 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2276 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2281 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2283 /* if no change do nothing */
2284 if ((rx->sta->sta.ht_cap.cap &
2285 IEEE80211_HT_CAP_SM_PS) == smps)
2288 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2289 rx->sta->sta.ht_cap.cap |= smps;
2291 sband = rx->local->hw.wiphy->bands[status->band];
2293 rate_control_rate_update(local, sband, rx->sta,
2294 IEEE80211_RC_SMPS_CHANGED);
2302 case WLAN_CATEGORY_BACK:
2303 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2304 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2305 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2306 sdata->vif.type != NL80211_IFTYPE_AP &&
2307 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2310 /* verify action_code is present */
2311 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2314 switch (mgmt->u.action.u.addba_req.action_code) {
2315 case WLAN_ACTION_ADDBA_REQ:
2316 if (len < (IEEE80211_MIN_ACTION_SIZE +
2317 sizeof(mgmt->u.action.u.addba_req)))
2320 case WLAN_ACTION_ADDBA_RESP:
2321 if (len < (IEEE80211_MIN_ACTION_SIZE +
2322 sizeof(mgmt->u.action.u.addba_resp)))
2325 case WLAN_ACTION_DELBA:
2326 if (len < (IEEE80211_MIN_ACTION_SIZE +
2327 sizeof(mgmt->u.action.u.delba)))
2335 case WLAN_CATEGORY_SPECTRUM_MGMT:
2336 if (status->band != IEEE80211_BAND_5GHZ)
2339 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2342 /* verify action_code is present */
2343 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2346 switch (mgmt->u.action.u.measurement.action_code) {
2347 case WLAN_ACTION_SPCT_MSR_REQ:
2348 if (len < (IEEE80211_MIN_ACTION_SIZE +
2349 sizeof(mgmt->u.action.u.measurement)))
2351 ieee80211_process_measurement_req(sdata, mgmt, len);
2353 case WLAN_ACTION_SPCT_CHL_SWITCH:
2354 if (len < (IEEE80211_MIN_ACTION_SIZE +
2355 sizeof(mgmt->u.action.u.chan_switch)))
2358 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2361 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2367 case WLAN_CATEGORY_SA_QUERY:
2368 if (len < (IEEE80211_MIN_ACTION_SIZE +
2369 sizeof(mgmt->u.action.u.sa_query)))
2372 switch (mgmt->u.action.u.sa_query.action) {
2373 case WLAN_ACTION_SA_QUERY_REQUEST:
2374 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2376 ieee80211_process_sa_query_req(sdata, mgmt, len);
2380 case WLAN_CATEGORY_SELF_PROTECTED:
2381 if (len < (IEEE80211_MIN_ACTION_SIZE +
2382 sizeof(mgmt->u.action.u.self_prot.action_code)))
2385 switch (mgmt->u.action.u.self_prot.action_code) {
2386 case WLAN_SP_MESH_PEERING_OPEN:
2387 case WLAN_SP_MESH_PEERING_CLOSE:
2388 case WLAN_SP_MESH_PEERING_CONFIRM:
2389 if (!ieee80211_vif_is_mesh(&sdata->vif))
2391 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2392 /* userspace handles this frame */
2395 case WLAN_SP_MGK_INFORM:
2396 case WLAN_SP_MGK_ACK:
2397 if (!ieee80211_vif_is_mesh(&sdata->vif))
2402 case WLAN_CATEGORY_MESH_ACTION:
2403 if (len < (IEEE80211_MIN_ACTION_SIZE +
2404 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2407 if (!ieee80211_vif_is_mesh(&sdata->vif))
2409 if (mesh_action_is_path_sel(mgmt) &&
2410 (!mesh_path_sel_is_hwmp(sdata)))
2418 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2419 /* will return in the next handlers */
2424 rx->sta->rx_packets++;
2425 dev_kfree_skb(rx->skb);
2429 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2430 skb_queue_tail(&sdata->skb_queue, rx->skb);
2431 ieee80211_queue_work(&local->hw, &sdata->work);
2433 rx->sta->rx_packets++;
2437 static ieee80211_rx_result debug_noinline
2438 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2440 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2443 /* skip known-bad action frames and return them in the next handler */
2444 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2448 * Getting here means the kernel doesn't know how to handle
2449 * it, but maybe userspace does ... include returned frames
2450 * so userspace can register for those to know whether ones
2451 * it transmitted were processed or returned.
2454 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2455 sig = status->signal;
2457 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2458 rx->skb->data, rx->skb->len,
2461 rx->sta->rx_packets++;
2462 dev_kfree_skb(rx->skb);
2470 static ieee80211_rx_result debug_noinline
2471 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2473 struct ieee80211_local *local = rx->local;
2474 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2475 struct sk_buff *nskb;
2476 struct ieee80211_sub_if_data *sdata = rx->sdata;
2477 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2479 if (!ieee80211_is_action(mgmt->frame_control))
2483 * For AP mode, hostapd is responsible for handling any action
2484 * frames that we didn't handle, including returning unknown
2485 * ones. For all other modes we will return them to the sender,
2486 * setting the 0x80 bit in the action category, as required by
2487 * 802.11-2012 9.24.4.
2488 * Newer versions of hostapd shall also use the management frame
2489 * registration mechanisms, but older ones still use cooked
2490 * monitor interfaces so push all frames there.
2492 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2493 (sdata->vif.type == NL80211_IFTYPE_AP ||
2494 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2495 return RX_DROP_MONITOR;
2497 if (is_multicast_ether_addr(mgmt->da))
2498 return RX_DROP_MONITOR;
2500 /* do not return rejected action frames */
2501 if (mgmt->u.action.category & 0x80)
2502 return RX_DROP_UNUSABLE;
2504 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2507 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2509 nmgmt->u.action.category |= 0x80;
2510 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2511 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2513 memset(nskb->cb, 0, sizeof(nskb->cb));
2515 ieee80211_tx_skb(rx->sdata, nskb);
2517 dev_kfree_skb(rx->skb);
2521 static ieee80211_rx_result debug_noinline
2522 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2524 struct ieee80211_sub_if_data *sdata = rx->sdata;
2525 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2528 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2530 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2531 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2532 sdata->vif.type != NL80211_IFTYPE_STATION)
2533 return RX_DROP_MONITOR;
2536 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2537 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2538 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2539 /* process for all: mesh, mlme, ibss */
2541 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2542 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2543 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2544 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2545 if (is_multicast_ether_addr(mgmt->da) &&
2546 !is_broadcast_ether_addr(mgmt->da))
2547 return RX_DROP_MONITOR;
2549 /* process only for station */
2550 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2551 return RX_DROP_MONITOR;
2553 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2554 /* process only for ibss */
2555 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2556 return RX_DROP_MONITOR;
2559 return RX_DROP_MONITOR;
2562 /* queue up frame and kick off work to process it */
2563 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2564 skb_queue_tail(&sdata->skb_queue, rx->skb);
2565 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2567 rx->sta->rx_packets++;
2572 /* TODO: use IEEE80211_RX_FRAGMENTED */
2573 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2574 struct ieee80211_rate *rate)
2576 struct ieee80211_sub_if_data *sdata;
2577 struct ieee80211_local *local = rx->local;
2578 struct sk_buff *skb = rx->skb, *skb2;
2579 struct net_device *prev_dev = NULL;
2580 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2581 int needed_headroom;
2584 * If cooked monitor has been processed already, then
2585 * don't do it again. If not, set the flag.
2587 if (rx->flags & IEEE80211_RX_CMNTR)
2589 rx->flags |= IEEE80211_RX_CMNTR;
2591 /* If there are no cooked monitor interfaces, just free the SKB */
2592 if (!local->cooked_mntrs)
2595 /* room for the radiotap header based on driver features */
2596 needed_headroom = ieee80211_rx_radiotap_len(local, status);
2598 if (skb_headroom(skb) < needed_headroom &&
2599 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2602 /* prepend radiotap information */
2603 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2606 skb_set_mac_header(skb, 0);
2607 skb->ip_summed = CHECKSUM_UNNECESSARY;
2608 skb->pkt_type = PACKET_OTHERHOST;
2609 skb->protocol = htons(ETH_P_802_2);
2611 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2612 if (!ieee80211_sdata_running(sdata))
2615 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2616 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2620 skb2 = skb_clone(skb, GFP_ATOMIC);
2622 skb2->dev = prev_dev;
2623 netif_receive_skb(skb2);
2627 prev_dev = sdata->dev;
2628 sdata->dev->stats.rx_packets++;
2629 sdata->dev->stats.rx_bytes += skb->len;
2633 skb->dev = prev_dev;
2634 netif_receive_skb(skb);
2642 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2643 ieee80211_rx_result res)
2646 case RX_DROP_MONITOR:
2647 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2649 rx->sta->rx_dropped++;
2652 struct ieee80211_rate *rate = NULL;
2653 struct ieee80211_supported_band *sband;
2654 struct ieee80211_rx_status *status;
2656 status = IEEE80211_SKB_RXCB((rx->skb));
2658 sband = rx->local->hw.wiphy->bands[status->band];
2659 if (!(status->flag & RX_FLAG_HT))
2660 rate = &sband->bitrates[status->rate_idx];
2662 ieee80211_rx_cooked_monitor(rx, rate);
2665 case RX_DROP_UNUSABLE:
2666 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2668 rx->sta->rx_dropped++;
2669 dev_kfree_skb(rx->skb);
2672 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2677 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2679 ieee80211_rx_result res = RX_DROP_MONITOR;
2680 struct sk_buff *skb;
2682 #define CALL_RXH(rxh) \
2685 if (res != RX_CONTINUE) \
2689 spin_lock(&rx->local->rx_skb_queue.lock);
2690 if (rx->local->running_rx_handler)
2693 rx->local->running_rx_handler = true;
2695 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2696 spin_unlock(&rx->local->rx_skb_queue.lock);
2699 * all the other fields are valid across frames
2700 * that belong to an aMPDU since they are on the
2701 * same TID from the same station
2705 CALL_RXH(ieee80211_rx_h_decrypt)
2706 CALL_RXH(ieee80211_rx_h_check_more_data)
2707 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2708 CALL_RXH(ieee80211_rx_h_sta_process)
2709 CALL_RXH(ieee80211_rx_h_defragment)
2710 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2711 /* must be after MMIC verify so header is counted in MPDU mic */
2712 #ifdef CONFIG_MAC80211_MESH
2713 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2714 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2716 CALL_RXH(ieee80211_rx_h_amsdu)
2717 CALL_RXH(ieee80211_rx_h_data)
2718 CALL_RXH(ieee80211_rx_h_ctrl);
2719 CALL_RXH(ieee80211_rx_h_mgmt_check)
2720 CALL_RXH(ieee80211_rx_h_action)
2721 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2722 CALL_RXH(ieee80211_rx_h_action_return)
2723 CALL_RXH(ieee80211_rx_h_mgmt)
2726 ieee80211_rx_handlers_result(rx, res);
2727 spin_lock(&rx->local->rx_skb_queue.lock);
2731 rx->local->running_rx_handler = false;
2734 spin_unlock(&rx->local->rx_skb_queue.lock);
2737 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2739 ieee80211_rx_result res = RX_DROP_MONITOR;
2741 #define CALL_RXH(rxh) \
2744 if (res != RX_CONTINUE) \
2748 CALL_RXH(ieee80211_rx_h_check)
2750 ieee80211_rx_reorder_ampdu(rx);
2752 ieee80211_rx_handlers(rx);
2756 ieee80211_rx_handlers_result(rx, res);
2762 * This function makes calls into the RX path, therefore
2763 * it has to be invoked under RCU read lock.
2765 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2767 struct ieee80211_rx_data rx = {
2769 .sdata = sta->sdata,
2770 .local = sta->local,
2771 /* This is OK -- must be QoS data frame */
2772 .security_idx = tid,
2776 struct tid_ampdu_rx *tid_agg_rx;
2778 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2782 spin_lock(&tid_agg_rx->reorder_lock);
2783 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2784 spin_unlock(&tid_agg_rx->reorder_lock);
2786 ieee80211_rx_handlers(&rx);
2789 /* main receive path */
2791 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2792 struct ieee80211_hdr *hdr)
2794 struct ieee80211_sub_if_data *sdata = rx->sdata;
2795 struct sk_buff *skb = rx->skb;
2796 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2797 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2798 int multicast = is_multicast_ether_addr(hdr->addr1);
2800 switch (sdata->vif.type) {
2801 case NL80211_IFTYPE_STATION:
2802 if (!bssid && !sdata->u.mgd.use_4addr)
2805 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2806 if (!(sdata->dev->flags & IFF_PROMISC) ||
2807 sdata->u.mgd.use_4addr)
2809 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2812 case NL80211_IFTYPE_ADHOC:
2815 if (ieee80211_is_beacon(hdr->frame_control)) {
2817 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2819 } else if (!multicast &&
2820 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2821 if (!(sdata->dev->flags & IFF_PROMISC))
2823 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2824 } else if (!rx->sta) {
2826 if (status->flag & RX_FLAG_HT)
2827 rate_idx = 0; /* TODO: HT rates */
2829 rate_idx = status->rate_idx;
2830 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2834 case NL80211_IFTYPE_MESH_POINT:
2836 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2837 if (!(sdata->dev->flags & IFF_PROMISC))
2840 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2843 case NL80211_IFTYPE_AP_VLAN:
2844 case NL80211_IFTYPE_AP:
2846 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2848 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
2850 * Accept public action frames even when the
2851 * BSSID doesn't match, this is used for P2P
2852 * and location updates. Note that mac80211
2853 * itself never looks at these frames.
2855 if (ieee80211_is_public_action(hdr, skb->len))
2857 if (!ieee80211_is_beacon(hdr->frame_control))
2859 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2862 case NL80211_IFTYPE_WDS:
2863 if (bssid || !ieee80211_is_data(hdr->frame_control))
2865 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
2868 case NL80211_IFTYPE_P2P_DEVICE:
2869 if (!ieee80211_is_public_action(hdr, skb->len) &&
2870 !ieee80211_is_probe_req(hdr->frame_control) &&
2871 !ieee80211_is_probe_resp(hdr->frame_control) &&
2872 !ieee80211_is_beacon(hdr->frame_control))
2874 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2875 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2878 /* should never get here */
2887 * This function returns whether or not the SKB
2888 * was destined for RX processing or not, which,
2889 * if consume is true, is equivalent to whether
2890 * or not the skb was consumed.
2892 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2893 struct sk_buff *skb, bool consume)
2895 struct ieee80211_local *local = rx->local;
2896 struct ieee80211_sub_if_data *sdata = rx->sdata;
2897 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2898 struct ieee80211_hdr *hdr = (void *)skb->data;
2902 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2903 prepares = prepare_for_handlers(rx, hdr);
2909 skb = skb_copy(skb, GFP_ATOMIC);
2911 if (net_ratelimit())
2912 wiphy_debug(local->hw.wiphy,
2913 "failed to copy skb for %s\n",
2921 ieee80211_invoke_rx_handlers(rx);
2926 * This is the actual Rx frames handler. as it blongs to Rx path it must
2927 * be called with rcu_read_lock protection.
2929 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2930 struct sk_buff *skb)
2932 struct ieee80211_local *local = hw_to_local(hw);
2933 struct ieee80211_sub_if_data *sdata;
2934 struct ieee80211_hdr *hdr;
2936 struct ieee80211_rx_data rx;
2937 struct ieee80211_sub_if_data *prev;
2938 struct sta_info *sta, *tmp, *prev_sta;
2941 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2942 memset(&rx, 0, sizeof(rx));
2946 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2947 local->dot11ReceivedFragmentCount++;
2949 if (ieee80211_is_mgmt(fc)) {
2950 /* drop frame if too short for header */
2951 if (skb->len < ieee80211_hdrlen(fc))
2954 err = skb_linearize(skb);
2956 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2964 hdr = (struct ieee80211_hdr *)skb->data;
2965 ieee80211_parse_qos(&rx);
2966 ieee80211_verify_alignment(&rx);
2968 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
2969 ieee80211_is_beacon(hdr->frame_control)))
2970 ieee80211_scan_rx(local, skb);
2972 if (ieee80211_is_data(fc)) {
2975 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2982 rx.sdata = prev_sta->sdata;
2983 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2990 rx.sdata = prev_sta->sdata;
2992 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3000 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3001 if (!ieee80211_sdata_running(sdata))
3004 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3005 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3009 * frame is destined for this interface, but if it's
3010 * not also for the previous one we handle that after
3011 * the loop to avoid copying the SKB once too much
3019 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3021 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3027 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3030 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3039 * This is the receive path handler. It is called by a low level driver when an
3040 * 802.11 MPDU is received from the hardware.
3042 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3044 struct ieee80211_local *local = hw_to_local(hw);
3045 struct ieee80211_rate *rate = NULL;
3046 struct ieee80211_supported_band *sband;
3047 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3049 WARN_ON_ONCE(softirq_count() == 0);
3051 if (WARN_ON(status->band < 0 ||
3052 status->band >= IEEE80211_NUM_BANDS))
3055 sband = local->hw.wiphy->bands[status->band];
3056 if (WARN_ON(!sband))
3060 * If we're suspending, it is possible although not too likely
3061 * that we'd be receiving frames after having already partially
3062 * quiesced the stack. We can't process such frames then since
3063 * that might, for example, cause stations to be added or other
3064 * driver callbacks be invoked.
3066 if (unlikely(local->quiescing || local->suspended))
3069 /* We might be during a HW reconfig, prevent Rx for the same reason */
3070 if (unlikely(local->in_reconfig))
3074 * The same happens when we're not even started,
3075 * but that's worth a warning.
3077 if (WARN_ON(!local->started))
3080 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3082 * Validate the rate, unless a PLCP error means that
3083 * we probably can't have a valid rate here anyway.
3086 if (status->flag & RX_FLAG_HT) {
3088 * rate_idx is MCS index, which can be [0-76]
3091 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3093 * Anything else would be some sort of driver or
3094 * hardware error. The driver should catch hardware
3097 if (WARN((status->rate_idx < 0 ||
3098 status->rate_idx > 76),
3099 "Rate marked as an HT rate but passed "
3100 "status->rate_idx is not "
3101 "an MCS index [0-76]: %d (0x%02x)\n",
3106 if (WARN_ON(status->rate_idx < 0 ||
3107 status->rate_idx >= sband->n_bitrates))
3109 rate = &sband->bitrates[status->rate_idx];
3113 status->rx_flags = 0;
3116 * key references and virtual interfaces are protected using RCU
3117 * and this requires that we are in a read-side RCU section during
3118 * receive processing
3123 * Frames with failed FCS/PLCP checksum are not returned,
3124 * all other frames are returned without radiotap header
3125 * if it was previously present.
3126 * Also, frames with less than 16 bytes are dropped.
3128 skb = ieee80211_rx_monitor(local, skb, rate);
3134 ieee80211_tpt_led_trig_rx(local,
3135 ((struct ieee80211_hdr *)skb->data)->frame_control,
3137 __ieee80211_rx_handle_packet(hw, skb);
3145 EXPORT_SYMBOL(ieee80211_rx);
3147 /* This is a version of the rx handler that can be called from hard irq
3148 * context. Post the skb on the queue and schedule the tasklet */
3149 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3151 struct ieee80211_local *local = hw_to_local(hw);
3153 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3155 skb->pkt_type = IEEE80211_RX_MSG;
3156 skb_queue_tail(&local->skb_queue, skb);
3157 tasklet_schedule(&local->tasklet);
3159 EXPORT_SYMBOL(ieee80211_rx_irqsafe);