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 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
47 __pskb_trim(skb, skb->len - FCS_LEN);
56 if (status->vendor_radiotap_len)
57 __pskb_pull(skb, status->vendor_radiotap_len);
62 static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
64 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
65 struct ieee80211_hdr *hdr;
67 hdr = (void *)(skb->data + status->vendor_radiotap_len);
69 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
70 RX_FLAG_FAILED_PLCP_CRC |
71 RX_FLAG_AMPDU_IS_ZEROLEN))
73 if (unlikely(skb->len < 16 + present_fcs_len +
74 status->vendor_radiotap_len))
76 if (ieee80211_is_ctl(hdr->frame_control) &&
77 !ieee80211_is_pspoll(hdr->frame_control) &&
78 !ieee80211_is_back_req(hdr->frame_control))
84 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
85 struct ieee80211_rx_status *status)
89 /* always present fields */
90 len = sizeof(struct ieee80211_radiotap_header) + 9;
92 /* allocate extra bitmap */
93 if (status->vendor_radiotap_len)
96 if (ieee80211_have_rx_timestamp(status)) {
100 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
103 /* padding for RX_FLAGS if necessary */
106 if (status->flag & RX_FLAG_HT) /* HT info */
109 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
114 if (status->flag & RX_FLAG_VHT) {
119 if (status->vendor_radiotap_len) {
120 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
121 status->vendor_radiotap_align = 1;
122 /* align standard part of vendor namespace */
124 /* allocate standard part of vendor namespace */
126 /* align vendor-defined part */
127 len = ALIGN(len, status->vendor_radiotap_align);
128 /* vendor-defined part is already in skb */
135 * ieee80211_add_rx_radiotap_header - add radiotap header
137 * add a radiotap header containing all the fields which the hardware provided.
140 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
142 struct ieee80211_rate *rate,
143 int rtap_len, bool has_fcs)
145 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
146 struct ieee80211_radiotap_header *rthdr;
152 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
155 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
156 memset(rthdr, 0, rtap_len);
158 /* radiotap header, set always present flags */
160 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
161 (1 << IEEE80211_RADIOTAP_CHANNEL) |
162 (1 << IEEE80211_RADIOTAP_ANTENNA) |
163 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
164 rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
166 pos = (unsigned char *)(rthdr + 1);
168 if (status->vendor_radiotap_len) {
170 cpu_to_le32(BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE)) |
171 cpu_to_le32(BIT(IEEE80211_RADIOTAP_EXT));
172 put_unaligned_le32(status->vendor_radiotap_bitmap, pos);
176 /* the order of the following fields is important */
178 /* IEEE80211_RADIOTAP_TSFT */
179 if (ieee80211_have_rx_timestamp(status)) {
181 while ((pos - (u8 *)rthdr) & 7)
184 ieee80211_calculate_rx_timestamp(local, status,
187 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
191 /* IEEE80211_RADIOTAP_FLAGS */
192 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
193 *pos |= IEEE80211_RADIOTAP_F_FCS;
194 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
195 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
196 if (status->flag & RX_FLAG_SHORTPRE)
197 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
200 /* IEEE80211_RADIOTAP_RATE */
201 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
203 * Without rate information don't add it. If we have,
204 * MCS information is a separate field in radiotap,
205 * added below. The byte here is needed as padding
206 * for the channel though, so initialise it to 0.
210 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
211 *pos = rate->bitrate / 5;
215 /* IEEE80211_RADIOTAP_CHANNEL */
216 put_unaligned_le16(status->freq, pos);
218 if (status->band == IEEE80211_BAND_5GHZ)
219 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
221 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
222 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
224 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
225 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
228 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
231 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
234 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
235 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
236 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
237 *pos = status->signal;
239 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
243 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
245 /* IEEE80211_RADIOTAP_ANTENNA */
246 *pos = status->antenna;
249 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
251 /* IEEE80211_RADIOTAP_RX_FLAGS */
252 /* ensure 2 byte alignment for the 2 byte field as required */
253 if ((pos - (u8 *)rthdr) & 1)
255 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
256 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
257 put_unaligned_le16(rx_flags, pos);
260 if (status->flag & RX_FLAG_HT) {
261 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
262 *pos++ = local->hw.radiotap_mcs_details;
264 if (status->flag & RX_FLAG_SHORT_GI)
265 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
266 if (status->flag & RX_FLAG_40MHZ)
267 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
268 if (status->flag & RX_FLAG_HT_GF)
269 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
271 *pos++ = status->rate_idx;
274 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
277 /* ensure 4 byte alignment */
278 while ((pos - (u8 *)rthdr) & 3)
281 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
282 put_unaligned_le32(status->ampdu_reference, pos);
284 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
285 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
286 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
287 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
288 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
289 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
290 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
291 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
292 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
293 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
294 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
295 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
296 put_unaligned_le16(flags, pos);
298 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
299 *pos++ = status->ampdu_delimiter_crc;
305 if (status->flag & RX_FLAG_VHT) {
306 u16 known = local->hw.radiotap_vht_details;
308 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
309 /* known field - how to handle 80+80? */
310 if (status->flag & RX_FLAG_80P80MHZ)
311 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
312 put_unaligned_le16(known, pos);
315 if (status->flag & RX_FLAG_SHORT_GI)
316 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
319 if (status->flag & RX_FLAG_80MHZ)
321 else if (status->flag & RX_FLAG_80P80MHZ)
322 *pos++ = 0; /* marked not known above */
323 else if (status->flag & RX_FLAG_160MHZ)
325 else if (status->flag & RX_FLAG_40MHZ)
330 *pos = (status->rate_idx << 4) | status->vht_nss;
340 if (status->vendor_radiotap_len) {
341 /* ensure 2 byte alignment for the vendor field as required */
342 if ((pos - (u8 *)rthdr) & 1)
344 *pos++ = status->vendor_radiotap_oui[0];
345 *pos++ = status->vendor_radiotap_oui[1];
346 *pos++ = status->vendor_radiotap_oui[2];
347 *pos++ = status->vendor_radiotap_subns;
348 put_unaligned_le16(status->vendor_radiotap_len, pos);
350 /* align the actual payload as requested */
351 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
357 * This function copies a received frame to all monitor interfaces and
358 * returns a cleaned-up SKB that no longer includes the FCS nor the
359 * radiotap header the driver might have added.
361 static struct sk_buff *
362 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
363 struct ieee80211_rate *rate)
365 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
366 struct ieee80211_sub_if_data *sdata;
368 struct sk_buff *skb, *skb2;
369 struct net_device *prev_dev = NULL;
370 int present_fcs_len = 0;
373 * First, we may need to make a copy of the skb because
374 * (1) we need to modify it for radiotap (if not present), and
375 * (2) the other RX handlers will modify the skb we got.
377 * We don't need to, of course, if we aren't going to return
378 * the SKB because it has a bad FCS/PLCP checksum.
381 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
382 present_fcs_len = FCS_LEN;
384 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
385 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
386 dev_kfree_skb(origskb);
390 if (!local->monitors) {
391 if (should_drop_frame(origskb, present_fcs_len)) {
392 dev_kfree_skb(origskb);
396 return remove_monitor_info(local, origskb);
399 /* room for the radiotap header based on driver features */
400 needed_headroom = ieee80211_rx_radiotap_space(local, status);
402 if (should_drop_frame(origskb, present_fcs_len)) {
403 /* only need to expand headroom if necessary */
408 * This shouldn't trigger often because most devices have an
409 * RX header they pull before we get here, and that should
410 * be big enough for our radiotap information. We should
411 * probably export the length to drivers so that we can have
412 * them allocate enough headroom to start with.
414 if (skb_headroom(skb) < needed_headroom &&
415 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
421 * Need to make a copy and possibly remove radiotap header
422 * and FCS from the original.
424 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
426 origskb = remove_monitor_info(local, origskb);
432 /* prepend radiotap information */
433 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
436 skb_reset_mac_header(skb);
437 skb->ip_summed = CHECKSUM_UNNECESSARY;
438 skb->pkt_type = PACKET_OTHERHOST;
439 skb->protocol = htons(ETH_P_802_2);
441 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
442 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
445 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
448 if (!ieee80211_sdata_running(sdata))
452 skb2 = skb_clone(skb, GFP_ATOMIC);
454 skb2->dev = prev_dev;
455 netif_receive_skb(skb2);
459 prev_dev = sdata->dev;
460 sdata->dev->stats.rx_packets++;
461 sdata->dev->stats.rx_bytes += skb->len;
466 netif_receive_skb(skb);
473 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
475 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
476 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
477 int tid, seqno_idx, security_idx;
479 /* does the frame have a qos control field? */
480 if (ieee80211_is_data_qos(hdr->frame_control)) {
481 u8 *qc = ieee80211_get_qos_ctl(hdr);
482 /* frame has qos control */
483 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
484 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
485 status->rx_flags |= IEEE80211_RX_AMSDU;
491 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
493 * Sequence numbers for management frames, QoS data
494 * frames with a broadcast/multicast address in the
495 * Address 1 field, and all non-QoS data frames sent
496 * by QoS STAs are assigned using an additional single
497 * modulo-4096 counter, [...]
499 * We also use that counter for non-QoS STAs.
501 seqno_idx = IEEE80211_NUM_TIDS;
503 if (ieee80211_is_mgmt(hdr->frame_control))
504 security_idx = IEEE80211_NUM_TIDS;
508 rx->seqno_idx = seqno_idx;
509 rx->security_idx = security_idx;
510 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
511 * For now, set skb->priority to 0 for other cases. */
512 rx->skb->priority = (tid > 7) ? 0 : tid;
516 * DOC: Packet alignment
518 * Drivers always need to pass packets that are aligned to two-byte boundaries
521 * Additionally, should, if possible, align the payload data in a way that
522 * guarantees that the contained IP header is aligned to a four-byte
523 * boundary. In the case of regular frames, this simply means aligning the
524 * payload to a four-byte boundary (because either the IP header is directly
525 * contained, or IV/RFC1042 headers that have a length divisible by four are
526 * in front of it). If the payload data is not properly aligned and the
527 * architecture doesn't support efficient unaligned operations, mac80211
528 * will align the data.
530 * With A-MSDU frames, however, the payload data address must yield two modulo
531 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
532 * push the IP header further back to a multiple of four again. Thankfully, the
533 * specs were sane enough this time around to require padding each A-MSDU
534 * subframe to a length that is a multiple of four.
536 * Padding like Atheros hardware adds which is between the 802.11 header and
537 * the payload is not supported, the driver is required to move the 802.11
538 * header to be directly in front of the payload in that case.
540 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
542 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
543 WARN_ONCE((unsigned long)rx->skb->data & 1,
544 "unaligned packet at 0x%p\n", rx->skb->data);
551 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
553 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
555 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
558 return ieee80211_is_robust_mgmt_frame(hdr);
562 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
564 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
566 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
569 return ieee80211_is_robust_mgmt_frame(hdr);
573 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
574 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
576 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
577 struct ieee80211_mmie *mmie;
579 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
582 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
583 return -1; /* not a robust management frame */
585 mmie = (struct ieee80211_mmie *)
586 (skb->data + skb->len - sizeof(*mmie));
587 if (mmie->element_id != WLAN_EID_MMIE ||
588 mmie->length != sizeof(*mmie) - 2)
591 return le16_to_cpu(mmie->key_id);
594 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
597 char *dev_addr = rx->sdata->vif.addr;
599 if (ieee80211_is_data(hdr->frame_control)) {
600 if (is_multicast_ether_addr(hdr->addr1)) {
601 if (ieee80211_has_tods(hdr->frame_control) ||
602 !ieee80211_has_fromds(hdr->frame_control))
603 return RX_DROP_MONITOR;
604 if (ether_addr_equal(hdr->addr3, dev_addr))
605 return RX_DROP_MONITOR;
607 if (!ieee80211_has_a4(hdr->frame_control))
608 return RX_DROP_MONITOR;
609 if (ether_addr_equal(hdr->addr4, dev_addr))
610 return RX_DROP_MONITOR;
614 /* If there is not an established peer link and this is not a peer link
615 * establisment frame, beacon or probe, drop the frame.
618 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
619 struct ieee80211_mgmt *mgmt;
621 if (!ieee80211_is_mgmt(hdr->frame_control))
622 return RX_DROP_MONITOR;
624 if (ieee80211_is_action(hdr->frame_control)) {
627 /* make sure category field is present */
628 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
629 return RX_DROP_MONITOR;
631 mgmt = (struct ieee80211_mgmt *)hdr;
632 category = mgmt->u.action.category;
633 if (category != WLAN_CATEGORY_MESH_ACTION &&
634 category != WLAN_CATEGORY_SELF_PROTECTED)
635 return RX_DROP_MONITOR;
639 if (ieee80211_is_probe_req(hdr->frame_control) ||
640 ieee80211_is_probe_resp(hdr->frame_control) ||
641 ieee80211_is_beacon(hdr->frame_control) ||
642 ieee80211_is_auth(hdr->frame_control))
645 return RX_DROP_MONITOR;
651 #define SEQ_MODULO 0x1000
652 #define SEQ_MASK 0xfff
654 static inline int seq_less(u16 sq1, u16 sq2)
656 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
659 static inline u16 seq_inc(u16 sq)
661 return (sq + 1) & SEQ_MASK;
664 static inline u16 seq_sub(u16 sq1, u16 sq2)
666 return (sq1 - sq2) & SEQ_MASK;
669 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
670 struct tid_ampdu_rx *tid_agg_rx,
673 struct ieee80211_local *local = sdata->local;
674 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
675 struct ieee80211_rx_status *status;
677 lockdep_assert_held(&tid_agg_rx->reorder_lock);
682 /* release the frame from the reorder ring buffer */
683 tid_agg_rx->stored_mpdu_num--;
684 tid_agg_rx->reorder_buf[index] = NULL;
685 status = IEEE80211_SKB_RXCB(skb);
686 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
687 skb_queue_tail(&local->rx_skb_queue, skb);
690 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
693 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
694 struct tid_ampdu_rx *tid_agg_rx,
699 lockdep_assert_held(&tid_agg_rx->reorder_lock);
701 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
702 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
703 tid_agg_rx->buf_size;
704 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
709 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
710 * the skb was added to the buffer longer than this time ago, the earlier
711 * frames that have not yet been received are assumed to be lost and the skb
712 * can be released for processing. This may also release other skb's from the
713 * reorder buffer if there are no additional gaps between the frames.
715 * Callers must hold tid_agg_rx->reorder_lock.
717 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
719 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
720 struct tid_ampdu_rx *tid_agg_rx)
724 lockdep_assert_held(&tid_agg_rx->reorder_lock);
726 /* release the buffer until next missing frame */
727 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
728 tid_agg_rx->buf_size;
729 if (!tid_agg_rx->reorder_buf[index] &&
730 tid_agg_rx->stored_mpdu_num) {
732 * No buffers ready to be released, but check whether any
733 * frames in the reorder buffer have timed out.
736 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
737 j = (j + 1) % tid_agg_rx->buf_size) {
738 if (!tid_agg_rx->reorder_buf[j]) {
743 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
744 HT_RX_REORDER_BUF_TIMEOUT))
745 goto set_release_timer;
747 ht_dbg_ratelimited(sdata,
748 "release an RX reorder frame due to timeout on earlier frames\n");
749 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
752 * Increment the head seq# also for the skipped slots.
754 tid_agg_rx->head_seq_num =
755 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
758 } else while (tid_agg_rx->reorder_buf[index]) {
759 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
760 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
761 tid_agg_rx->buf_size;
764 if (tid_agg_rx->stored_mpdu_num) {
765 j = index = seq_sub(tid_agg_rx->head_seq_num,
766 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
768 for (; j != (index - 1) % tid_agg_rx->buf_size;
769 j = (j + 1) % tid_agg_rx->buf_size) {
770 if (tid_agg_rx->reorder_buf[j])
776 mod_timer(&tid_agg_rx->reorder_timer,
777 tid_agg_rx->reorder_time[j] + 1 +
778 HT_RX_REORDER_BUF_TIMEOUT);
780 del_timer(&tid_agg_rx->reorder_timer);
785 * As this function belongs to the RX path it must be under
786 * rcu_read_lock protection. It returns false if the frame
787 * can be processed immediately, true if it was consumed.
789 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
790 struct tid_ampdu_rx *tid_agg_rx,
793 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
794 u16 sc = le16_to_cpu(hdr->seq_ctrl);
795 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
796 u16 head_seq_num, buf_size;
800 spin_lock(&tid_agg_rx->reorder_lock);
802 buf_size = tid_agg_rx->buf_size;
803 head_seq_num = tid_agg_rx->head_seq_num;
805 /* frame with out of date sequence number */
806 if (seq_less(mpdu_seq_num, head_seq_num)) {
812 * If frame the sequence number exceeds our buffering window
813 * size release some previous frames to make room for this one.
815 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
816 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
817 /* release stored frames up to new head to stack */
818 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
822 /* Now the new frame is always in the range of the reordering buffer */
824 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
826 /* check if we already stored this frame */
827 if (tid_agg_rx->reorder_buf[index]) {
833 * If the current MPDU is in the right order and nothing else
834 * is stored we can process it directly, no need to buffer it.
835 * If it is first but there's something stored, we may be able
836 * to release frames after this one.
838 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
839 tid_agg_rx->stored_mpdu_num == 0) {
840 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
845 /* put the frame in the reordering buffer */
846 tid_agg_rx->reorder_buf[index] = skb;
847 tid_agg_rx->reorder_time[index] = jiffies;
848 tid_agg_rx->stored_mpdu_num++;
849 ieee80211_sta_reorder_release(sdata, tid_agg_rx);
852 spin_unlock(&tid_agg_rx->reorder_lock);
857 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
858 * true if the MPDU was buffered, false if it should be processed.
860 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
862 struct sk_buff *skb = rx->skb;
863 struct ieee80211_local *local = rx->local;
864 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
865 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
866 struct sta_info *sta = rx->sta;
867 struct tid_ampdu_rx *tid_agg_rx;
871 if (!ieee80211_is_data_qos(hdr->frame_control))
875 * filter the QoS data rx stream according to
876 * STA/TID and check if this STA/TID is on aggregation
882 ack_policy = *ieee80211_get_qos_ctl(hdr) &
883 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
884 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
886 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
890 /* qos null data frames are excluded */
891 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
894 /* not part of a BA session */
895 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
896 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
899 /* not actually part of this BA session */
900 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
903 /* new, potentially un-ordered, ampdu frame - process it */
905 /* reset session timer */
906 if (tid_agg_rx->timeout)
907 tid_agg_rx->last_rx = jiffies;
909 /* if this mpdu is fragmented - terminate rx aggregation session */
910 sc = le16_to_cpu(hdr->seq_ctrl);
911 if (sc & IEEE80211_SCTL_FRAG) {
912 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
913 skb_queue_tail(&rx->sdata->skb_queue, skb);
914 ieee80211_queue_work(&local->hw, &rx->sdata->work);
919 * No locking needed -- we will only ever process one
920 * RX packet at a time, and thus own tid_agg_rx. All
921 * other code manipulating it needs to (and does) make
922 * sure that we cannot get to it any more before doing
925 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb))
929 skb_queue_tail(&local->rx_skb_queue, skb);
932 static ieee80211_rx_result debug_noinline
933 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
935 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
936 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
938 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
939 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
940 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
941 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
943 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
944 rx->local->dot11FrameDuplicateCount++;
945 rx->sta->num_duplicates++;
947 return RX_DROP_UNUSABLE;
949 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
952 if (unlikely(rx->skb->len < 16)) {
953 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
954 return RX_DROP_MONITOR;
957 /* Drop disallowed frame classes based on STA auth/assoc state;
958 * IEEE 802.11, Chap 5.5.
960 * mac80211 filters only based on association state, i.e. it drops
961 * Class 3 frames from not associated stations. hostapd sends
962 * deauth/disassoc frames when needed. In addition, hostapd is
963 * responsible for filtering on both auth and assoc states.
966 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
967 return ieee80211_rx_mesh_check(rx);
969 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
970 ieee80211_is_pspoll(hdr->frame_control)) &&
971 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
972 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
973 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
975 * accept port control frames from the AP even when it's not
976 * yet marked ASSOC to prevent a race where we don't set the
977 * assoc bit quickly enough before it sends the first frame
979 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
980 ieee80211_is_data_present(hdr->frame_control)) {
984 hdrlen = ieee80211_hdrlen(hdr->frame_control);
986 if (rx->skb->len < hdrlen + 8)
987 return RX_DROP_MONITOR;
989 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
990 if (ethertype == rx->sdata->control_port_protocol)
994 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
995 cfg80211_rx_spurious_frame(rx->sdata->dev,
998 return RX_DROP_UNUSABLE;
1000 return RX_DROP_MONITOR;
1007 static ieee80211_rx_result debug_noinline
1008 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1010 struct sk_buff *skb = rx->skb;
1011 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1012 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1015 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1016 struct ieee80211_key *sta_ptk = NULL;
1017 int mmie_keyidx = -1;
1023 * There are four types of keys:
1024 * - GTK (group keys)
1025 * - IGTK (group keys for management frames)
1026 * - PTK (pairwise keys)
1027 * - STK (station-to-station pairwise keys)
1029 * When selecting a key, we have to distinguish between multicast
1030 * (including broadcast) and unicast frames, the latter can only
1031 * use PTKs and STKs while the former always use GTKs and IGTKs.
1032 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1033 * unicast frames can also use key indices like GTKs. Hence, if we
1034 * don't have a PTK/STK we check the key index for a WEP key.
1036 * Note that in a regular BSS, multicast frames are sent by the
1037 * AP only, associated stations unicast the frame to the AP first
1038 * which then multicasts it on their behalf.
1040 * There is also a slight problem in IBSS mode: GTKs are negotiated
1041 * with each station, that is something we don't currently handle.
1042 * The spec seems to expect that one negotiates the same key with
1043 * every station but there's no such requirement; VLANs could be
1048 * No point in finding a key and decrypting if the frame is neither
1049 * addressed to us nor a multicast frame.
1051 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1054 /* start without a key */
1058 sta_ptk = rcu_dereference(rx->sta->ptk);
1060 fc = hdr->frame_control;
1062 if (!ieee80211_has_protected(fc))
1063 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1065 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1067 if ((status->flag & RX_FLAG_DECRYPTED) &&
1068 (status->flag & RX_FLAG_IV_STRIPPED))
1070 /* Skip decryption if the frame is not protected. */
1071 if (!ieee80211_has_protected(fc))
1073 } else if (mmie_keyidx >= 0) {
1074 /* Broadcast/multicast robust management frame / BIP */
1075 if ((status->flag & RX_FLAG_DECRYPTED) &&
1076 (status->flag & RX_FLAG_IV_STRIPPED))
1079 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1080 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1081 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1083 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1085 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1086 } else if (!ieee80211_has_protected(fc)) {
1088 * The frame was not protected, so skip decryption. However, we
1089 * need to set rx->key if there is a key that could have been
1090 * used so that the frame may be dropped if encryption would
1091 * have been expected.
1093 struct ieee80211_key *key = NULL;
1094 struct ieee80211_sub_if_data *sdata = rx->sdata;
1097 if (ieee80211_is_mgmt(fc) &&
1098 is_multicast_ether_addr(hdr->addr1) &&
1099 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1103 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1104 key = rcu_dereference(rx->sta->gtk[i]);
1110 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1111 key = rcu_dereference(sdata->keys[i]);
1123 * The device doesn't give us the IV so we won't be
1124 * able to look up the key. That's ok though, we
1125 * don't need to decrypt the frame, we just won't
1126 * be able to keep statistics accurate.
1127 * Except for key threshold notifications, should
1128 * we somehow allow the driver to tell us which key
1129 * the hardware used if this flag is set?
1131 if ((status->flag & RX_FLAG_DECRYPTED) &&
1132 (status->flag & RX_FLAG_IV_STRIPPED))
1135 hdrlen = ieee80211_hdrlen(fc);
1137 if (rx->skb->len < 8 + hdrlen)
1138 return RX_DROP_UNUSABLE; /* TODO: count this? */
1141 * no need to call ieee80211_wep_get_keyidx,
1142 * it verifies a bunch of things we've done already
1144 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1145 keyidx = keyid >> 6;
1147 /* check per-station GTK first, if multicast packet */
1148 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1149 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1151 /* if not found, try default key */
1153 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1156 * RSNA-protected unicast frames should always be
1157 * sent with pairwise or station-to-station keys,
1158 * but for WEP we allow using a key index as well.
1161 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1162 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1163 !is_multicast_ether_addr(hdr->addr1))
1169 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1170 return RX_DROP_MONITOR;
1172 rx->key->tx_rx_count++;
1173 /* TODO: add threshold stuff again */
1175 return RX_DROP_MONITOR;
1178 switch (rx->key->conf.cipher) {
1179 case WLAN_CIPHER_SUITE_WEP40:
1180 case WLAN_CIPHER_SUITE_WEP104:
1181 result = ieee80211_crypto_wep_decrypt(rx);
1183 case WLAN_CIPHER_SUITE_TKIP:
1184 result = ieee80211_crypto_tkip_decrypt(rx);
1186 case WLAN_CIPHER_SUITE_CCMP:
1187 result = ieee80211_crypto_ccmp_decrypt(rx);
1189 case WLAN_CIPHER_SUITE_AES_CMAC:
1190 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1194 * We can reach here only with HW-only algorithms
1195 * but why didn't it decrypt the frame?!
1197 return RX_DROP_UNUSABLE;
1200 /* the hdr variable is invalid after the decrypt handlers */
1202 /* either the frame has been decrypted or will be dropped */
1203 status->flag |= RX_FLAG_DECRYPTED;
1208 static ieee80211_rx_result debug_noinline
1209 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1211 struct ieee80211_local *local;
1212 struct ieee80211_hdr *hdr;
1213 struct sk_buff *skb;
1217 hdr = (struct ieee80211_hdr *) skb->data;
1219 if (!local->pspolling)
1222 if (!ieee80211_has_fromds(hdr->frame_control))
1223 /* this is not from AP */
1226 if (!ieee80211_is_data(hdr->frame_control))
1229 if (!ieee80211_has_moredata(hdr->frame_control)) {
1230 /* AP has no more frames buffered for us */
1231 local->pspolling = false;
1235 /* more data bit is set, let's request a new frame from the AP */
1236 ieee80211_send_pspoll(local, rx->sdata);
1241 static void sta_ps_start(struct sta_info *sta)
1243 struct ieee80211_sub_if_data *sdata = sta->sdata;
1244 struct ieee80211_local *local = sdata->local;
1247 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1248 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1249 ps = &sdata->bss->ps;
1253 atomic_inc(&ps->num_sta_ps);
1254 set_sta_flag(sta, WLAN_STA_PS_STA);
1255 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1256 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1257 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1258 sta->sta.addr, sta->sta.aid);
1261 static void sta_ps_end(struct sta_info *sta)
1263 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1264 sta->sta.addr, sta->sta.aid);
1266 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1267 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1268 sta->sta.addr, sta->sta.aid);
1272 ieee80211_sta_ps_deliver_wakeup(sta);
1275 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1277 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1280 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1282 /* Don't let the same PS state be set twice */
1283 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1284 if ((start && in_ps) || (!start && !in_ps))
1288 sta_ps_start(sta_inf);
1290 sta_ps_end(sta_inf);
1294 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1296 static ieee80211_rx_result debug_noinline
1297 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1299 struct ieee80211_sub_if_data *sdata = rx->sdata;
1300 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1301 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1304 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1307 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1308 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1312 * The device handles station powersave, so don't do anything about
1313 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1314 * it to mac80211 since they're handled.)
1316 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1320 * Don't do anything if the station isn't already asleep. In
1321 * the uAPSD case, the station will probably be marked asleep,
1322 * in the PS-Poll case the station must be confused ...
1324 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1327 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1328 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1329 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1330 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1332 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1335 /* Free PS Poll skb here instead of returning RX_DROP that would
1336 * count as an dropped frame. */
1337 dev_kfree_skb(rx->skb);
1340 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1341 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1342 ieee80211_has_pm(hdr->frame_control) &&
1343 (ieee80211_is_data_qos(hdr->frame_control) ||
1344 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1345 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1346 ac = ieee802_1d_to_ac[tid & 7];
1349 * If this AC is not trigger-enabled do nothing.
1351 * NB: This could/should check a separate bitmap of trigger-
1352 * enabled queues, but for now we only implement uAPSD w/o
1353 * TSPEC changes to the ACs, so they're always the same.
1355 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1358 /* if we are in a service period, do nothing */
1359 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1362 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1363 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1365 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1371 static ieee80211_rx_result debug_noinline
1372 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1374 struct sta_info *sta = rx->sta;
1375 struct sk_buff *skb = rx->skb;
1376 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1377 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1383 * Update last_rx only for IBSS packets which are for the current
1384 * BSSID and for station already AUTHORIZED to avoid keeping the
1385 * current IBSS network alive in cases where other STAs start
1386 * using different BSSID. This will also give the station another
1387 * chance to restart the authentication/authorization in case
1388 * something went wrong the first time.
1390 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1391 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1392 NL80211_IFTYPE_ADHOC);
1393 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1394 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1395 sta->last_rx = jiffies;
1396 if (ieee80211_is_data(hdr->frame_control)) {
1397 sta->last_rx_rate_idx = status->rate_idx;
1398 sta->last_rx_rate_flag = status->flag;
1399 sta->last_rx_rate_vht_nss = status->vht_nss;
1402 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1404 * Mesh beacons will update last_rx when if they are found to
1405 * match the current local configuration when processed.
1407 sta->last_rx = jiffies;
1408 if (ieee80211_is_data(hdr->frame_control)) {
1409 sta->last_rx_rate_idx = status->rate_idx;
1410 sta->last_rx_rate_flag = status->flag;
1411 sta->last_rx_rate_vht_nss = status->vht_nss;
1415 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1418 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1419 ieee80211_sta_rx_notify(rx->sdata, hdr);
1421 sta->rx_fragments++;
1422 sta->rx_bytes += rx->skb->len;
1423 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1424 sta->last_signal = status->signal;
1425 ewma_add(&sta->avg_signal, -status->signal);
1429 * Change STA power saving mode only at the end of a frame
1430 * exchange sequence.
1432 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1433 !ieee80211_has_morefrags(hdr->frame_control) &&
1434 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1435 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1436 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1437 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1439 * Ignore doze->wake transitions that are
1440 * indicated by non-data frames, the standard
1441 * is unclear here, but for example going to
1442 * PS mode and then scanning would cause a
1443 * doze->wake transition for the probe request,
1444 * and that is clearly undesirable.
1446 if (ieee80211_is_data(hdr->frame_control) &&
1447 !ieee80211_has_pm(hdr->frame_control))
1450 if (ieee80211_has_pm(hdr->frame_control))
1456 * Drop (qos-)data::nullfunc frames silently, since they
1457 * are used only to control station power saving mode.
1459 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1460 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1461 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1464 * If we receive a 4-addr nullfunc frame from a STA
1465 * that was not moved to a 4-addr STA vlan yet send
1466 * the event to userspace and for older hostapd drop
1467 * the frame to the monitor interface.
1469 if (ieee80211_has_a4(hdr->frame_control) &&
1470 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1471 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1472 !rx->sdata->u.vlan.sta))) {
1473 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1474 cfg80211_rx_unexpected_4addr_frame(
1475 rx->sdata->dev, sta->sta.addr,
1477 return RX_DROP_MONITOR;
1480 * Update counter and free packet here to avoid
1481 * counting this as a dropped packed.
1484 dev_kfree_skb(rx->skb);
1489 } /* ieee80211_rx_h_sta_process */
1491 static inline struct ieee80211_fragment_entry *
1492 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1493 unsigned int frag, unsigned int seq, int rx_queue,
1494 struct sk_buff **skb)
1496 struct ieee80211_fragment_entry *entry;
1498 entry = &sdata->fragments[sdata->fragment_next++];
1499 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1500 sdata->fragment_next = 0;
1502 if (!skb_queue_empty(&entry->skb_list))
1503 __skb_queue_purge(&entry->skb_list);
1505 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1507 entry->first_frag_time = jiffies;
1509 entry->rx_queue = rx_queue;
1510 entry->last_frag = frag;
1512 entry->extra_len = 0;
1517 static inline struct ieee80211_fragment_entry *
1518 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1519 unsigned int frag, unsigned int seq,
1520 int rx_queue, struct ieee80211_hdr *hdr)
1522 struct ieee80211_fragment_entry *entry;
1525 idx = sdata->fragment_next;
1526 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1527 struct ieee80211_hdr *f_hdr;
1531 idx = IEEE80211_FRAGMENT_MAX - 1;
1533 entry = &sdata->fragments[idx];
1534 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1535 entry->rx_queue != rx_queue ||
1536 entry->last_frag + 1 != frag)
1539 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1542 * Check ftype and addresses are equal, else check next fragment
1544 if (((hdr->frame_control ^ f_hdr->frame_control) &
1545 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1546 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1547 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1550 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1551 __skb_queue_purge(&entry->skb_list);
1560 static ieee80211_rx_result debug_noinline
1561 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1563 struct ieee80211_hdr *hdr;
1566 unsigned int frag, seq;
1567 struct ieee80211_fragment_entry *entry;
1568 struct sk_buff *skb;
1569 struct ieee80211_rx_status *status;
1571 hdr = (struct ieee80211_hdr *)rx->skb->data;
1572 fc = hdr->frame_control;
1574 if (ieee80211_is_ctl(fc))
1577 sc = le16_to_cpu(hdr->seq_ctrl);
1578 frag = sc & IEEE80211_SCTL_FRAG;
1580 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1581 is_multicast_ether_addr(hdr->addr1))) {
1582 /* not fragmented */
1585 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1587 if (skb_linearize(rx->skb))
1588 return RX_DROP_UNUSABLE;
1591 * skb_linearize() might change the skb->data and
1592 * previously cached variables (in this case, hdr) need to
1593 * be refreshed with the new data.
1595 hdr = (struct ieee80211_hdr *)rx->skb->data;
1596 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1599 /* This is the first fragment of a new frame. */
1600 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1601 rx->seqno_idx, &(rx->skb));
1602 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1603 ieee80211_has_protected(fc)) {
1604 int queue = rx->security_idx;
1605 /* Store CCMP PN so that we can verify that the next
1606 * fragment has a sequential PN value. */
1608 memcpy(entry->last_pn,
1609 rx->key->u.ccmp.rx_pn[queue],
1615 /* This is a fragment for a frame that should already be pending in
1616 * fragment cache. Add this fragment to the end of the pending entry.
1618 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1619 rx->seqno_idx, hdr);
1621 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1622 return RX_DROP_MONITOR;
1625 /* Verify that MPDUs within one MSDU have sequential PN values.
1626 * (IEEE 802.11i, 8.3.3.4.5) */
1629 u8 pn[CCMP_PN_LEN], *rpn;
1631 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1632 return RX_DROP_UNUSABLE;
1633 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1634 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1639 queue = rx->security_idx;
1640 rpn = rx->key->u.ccmp.rx_pn[queue];
1641 if (memcmp(pn, rpn, CCMP_PN_LEN))
1642 return RX_DROP_UNUSABLE;
1643 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1646 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1647 __skb_queue_tail(&entry->skb_list, rx->skb);
1648 entry->last_frag = frag;
1649 entry->extra_len += rx->skb->len;
1650 if (ieee80211_has_morefrags(fc)) {
1655 rx->skb = __skb_dequeue(&entry->skb_list);
1656 if (skb_tailroom(rx->skb) < entry->extra_len) {
1657 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1658 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1660 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1661 __skb_queue_purge(&entry->skb_list);
1662 return RX_DROP_UNUSABLE;
1665 while ((skb = __skb_dequeue(&entry->skb_list))) {
1666 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1670 /* Complete frame has been reassembled - process it now */
1671 status = IEEE80211_SKB_RXCB(rx->skb);
1672 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1676 rx->sta->rx_packets++;
1677 if (is_multicast_ether_addr(hdr->addr1))
1678 rx->local->dot11MulticastReceivedFrameCount++;
1680 ieee80211_led_rx(rx->local);
1684 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1686 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1692 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1694 struct sk_buff *skb = rx->skb;
1695 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1698 * Pass through unencrypted frames if the hardware has
1699 * decrypted them already.
1701 if (status->flag & RX_FLAG_DECRYPTED)
1704 /* Drop unencrypted frames if key is set. */
1705 if (unlikely(!ieee80211_has_protected(fc) &&
1706 !ieee80211_is_nullfunc(fc) &&
1707 ieee80211_is_data(fc) &&
1708 (rx->key || rx->sdata->drop_unencrypted)))
1714 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1716 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1717 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1718 __le16 fc = hdr->frame_control;
1721 * Pass through unencrypted frames if the hardware has
1722 * decrypted them already.
1724 if (status->flag & RX_FLAG_DECRYPTED)
1727 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1728 if (unlikely(!ieee80211_has_protected(fc) &&
1729 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1731 if (ieee80211_is_deauth(fc))
1732 cfg80211_send_unprot_deauth(rx->sdata->dev,
1735 else if (ieee80211_is_disassoc(fc))
1736 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1741 /* BIP does not use Protected field, so need to check MMIE */
1742 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1743 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1744 if (ieee80211_is_deauth(fc))
1745 cfg80211_send_unprot_deauth(rx->sdata->dev,
1748 else if (ieee80211_is_disassoc(fc))
1749 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1755 * When using MFP, Action frames are not allowed prior to
1756 * having configured keys.
1758 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1759 ieee80211_is_robust_mgmt_frame(
1760 (struct ieee80211_hdr *) rx->skb->data)))
1768 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1770 struct ieee80211_sub_if_data *sdata = rx->sdata;
1771 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1772 bool check_port_control = false;
1773 struct ethhdr *ehdr;
1776 *port_control = false;
1777 if (ieee80211_has_a4(hdr->frame_control) &&
1778 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1781 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1782 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1784 if (!sdata->u.mgd.use_4addr)
1787 check_port_control = true;
1790 if (is_multicast_ether_addr(hdr->addr1) &&
1791 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1794 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1798 ehdr = (struct ethhdr *) rx->skb->data;
1799 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1800 *port_control = true;
1801 else if (check_port_control)
1808 * requires that rx->skb is a frame with ethernet header
1810 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1812 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1813 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1814 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1817 * Allow EAPOL frames to us/the PAE group address regardless
1818 * of whether the frame was encrypted or not.
1820 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1821 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1822 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1825 if (ieee80211_802_1x_port_control(rx) ||
1826 ieee80211_drop_unencrypted(rx, fc))
1833 * requires that rx->skb is a frame with ethernet header
1836 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1838 struct ieee80211_sub_if_data *sdata = rx->sdata;
1839 struct net_device *dev = sdata->dev;
1840 struct sk_buff *skb, *xmit_skb;
1841 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1842 struct sta_info *dsta;
1843 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1848 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1849 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1850 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1851 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1852 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1853 if (is_multicast_ether_addr(ehdr->h_dest)) {
1855 * send multicast frames both to higher layers in
1856 * local net stack and back to the wireless medium
1858 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1860 net_info_ratelimited("%s: failed to clone multicast frame\n",
1863 dsta = sta_info_get(sdata, skb->data);
1866 * The destination station is associated to
1867 * this AP (in this VLAN), so send the frame
1868 * directly to it and do not pass it to local
1878 int align __maybe_unused;
1880 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1882 * 'align' will only take the values 0 or 2 here
1883 * since all frames are required to be aligned
1884 * to 2-byte boundaries when being passed to
1885 * mac80211. That also explains the __skb_push()
1888 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1890 if (WARN_ON(skb_headroom(skb) < 3)) {
1894 u8 *data = skb->data;
1895 size_t len = skb_headlen(skb);
1897 memmove(skb->data, data, len);
1898 skb_set_tail_pointer(skb, len);
1904 /* deliver to local stack */
1905 skb->protocol = eth_type_trans(skb, dev);
1906 memset(skb->cb, 0, sizeof(skb->cb));
1907 netif_receive_skb(skb);
1913 * Send to wireless media and increase priority by 256 to
1914 * keep the received priority instead of reclassifying
1915 * the frame (see cfg80211_classify8021d).
1917 xmit_skb->priority += 256;
1918 xmit_skb->protocol = htons(ETH_P_802_3);
1919 skb_reset_network_header(xmit_skb);
1920 skb_reset_mac_header(xmit_skb);
1921 dev_queue_xmit(xmit_skb);
1925 static ieee80211_rx_result debug_noinline
1926 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1928 struct net_device *dev = rx->sdata->dev;
1929 struct sk_buff *skb = rx->skb;
1930 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1931 __le16 fc = hdr->frame_control;
1932 struct sk_buff_head frame_list;
1933 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1935 if (unlikely(!ieee80211_is_data(fc)))
1938 if (unlikely(!ieee80211_is_data_present(fc)))
1939 return RX_DROP_MONITOR;
1941 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1944 if (ieee80211_has_a4(hdr->frame_control) &&
1945 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1946 !rx->sdata->u.vlan.sta)
1947 return RX_DROP_UNUSABLE;
1949 if (is_multicast_ether_addr(hdr->addr1) &&
1950 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1951 rx->sdata->u.vlan.sta) ||
1952 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1953 rx->sdata->u.mgd.use_4addr)))
1954 return RX_DROP_UNUSABLE;
1957 __skb_queue_head_init(&frame_list);
1959 if (skb_linearize(skb))
1960 return RX_DROP_UNUSABLE;
1962 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1963 rx->sdata->vif.type,
1964 rx->local->hw.extra_tx_headroom, true);
1966 while (!skb_queue_empty(&frame_list)) {
1967 rx->skb = __skb_dequeue(&frame_list);
1969 if (!ieee80211_frame_allowed(rx, fc)) {
1970 dev_kfree_skb(rx->skb);
1973 dev->stats.rx_packets++;
1974 dev->stats.rx_bytes += rx->skb->len;
1976 ieee80211_deliver_skb(rx);
1982 #ifdef CONFIG_MAC80211_MESH
1983 static ieee80211_rx_result
1984 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1986 struct ieee80211_hdr *fwd_hdr, *hdr;
1987 struct ieee80211_tx_info *info;
1988 struct ieee80211s_hdr *mesh_hdr;
1989 struct sk_buff *skb = rx->skb, *fwd_skb;
1990 struct ieee80211_local *local = rx->local;
1991 struct ieee80211_sub_if_data *sdata = rx->sdata;
1992 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1993 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1994 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1997 hdr = (struct ieee80211_hdr *) skb->data;
1998 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2000 /* make sure fixed part of mesh header is there, also checks skb len */
2001 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2002 return RX_DROP_MONITOR;
2004 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2006 /* make sure full mesh header is there, also checks skb len */
2007 if (!pskb_may_pull(rx->skb,
2008 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2009 return RX_DROP_MONITOR;
2011 /* reload pointers */
2012 hdr = (struct ieee80211_hdr *) skb->data;
2013 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2015 /* frame is in RMC, don't forward */
2016 if (ieee80211_is_data(hdr->frame_control) &&
2017 is_multicast_ether_addr(hdr->addr1) &&
2018 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
2019 return RX_DROP_MONITOR;
2021 if (!ieee80211_is_data(hdr->frame_control) ||
2022 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2026 return RX_DROP_MONITOR;
2028 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2029 struct mesh_path *mppath;
2033 if (is_multicast_ether_addr(hdr->addr1)) {
2034 mpp_addr = hdr->addr3;
2035 proxied_addr = mesh_hdr->eaddr1;
2036 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2037 /* has_a4 already checked in ieee80211_rx_mesh_check */
2038 mpp_addr = hdr->addr4;
2039 proxied_addr = mesh_hdr->eaddr2;
2041 return RX_DROP_MONITOR;
2045 mppath = mpp_path_lookup(proxied_addr, sdata);
2047 mpp_path_add(proxied_addr, mpp_addr, sdata);
2049 spin_lock_bh(&mppath->state_lock);
2050 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2051 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2052 spin_unlock_bh(&mppath->state_lock);
2057 /* Frame has reached destination. Don't forward */
2058 if (!is_multicast_ether_addr(hdr->addr1) &&
2059 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2062 q = ieee80211_select_queue_80211(sdata, skb, hdr);
2063 if (ieee80211_queue_stopped(&local->hw, q)) {
2064 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2065 return RX_DROP_MONITOR;
2067 skb_set_queue_mapping(skb, q);
2069 if (!--mesh_hdr->ttl) {
2070 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2074 if (!ifmsh->mshcfg.dot11MeshForwarding)
2077 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2079 net_info_ratelimited("%s: failed to clone mesh frame\n",
2084 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2085 info = IEEE80211_SKB_CB(fwd_skb);
2086 memset(info, 0, sizeof(*info));
2087 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2088 info->control.vif = &rx->sdata->vif;
2089 info->control.jiffies = jiffies;
2090 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2091 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2092 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2093 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
2094 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2096 /* unable to resolve next hop */
2097 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
2098 0, reason, fwd_hdr->addr2, sdata);
2099 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2101 return RX_DROP_MONITOR;
2104 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2105 ieee80211_add_pending_skb(local, fwd_skb);
2107 if (is_multicast_ether_addr(hdr->addr1) ||
2108 sdata->dev->flags & IFF_PROMISC)
2111 return RX_DROP_MONITOR;
2115 static ieee80211_rx_result debug_noinline
2116 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2118 struct ieee80211_sub_if_data *sdata = rx->sdata;
2119 struct ieee80211_local *local = rx->local;
2120 struct net_device *dev = sdata->dev;
2121 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2122 __le16 fc = hdr->frame_control;
2126 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2129 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2130 return RX_DROP_MONITOR;
2133 * Send unexpected-4addr-frame event to hostapd. For older versions,
2134 * also drop the frame to cooked monitor interfaces.
2136 if (ieee80211_has_a4(hdr->frame_control) &&
2137 sdata->vif.type == NL80211_IFTYPE_AP) {
2139 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2140 cfg80211_rx_unexpected_4addr_frame(
2141 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2142 return RX_DROP_MONITOR;
2145 err = __ieee80211_data_to_8023(rx, &port_control);
2147 return RX_DROP_UNUSABLE;
2149 if (!ieee80211_frame_allowed(rx, fc))
2150 return RX_DROP_MONITOR;
2152 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2153 unlikely(port_control) && sdata->bss) {
2154 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2162 dev->stats.rx_packets++;
2163 dev->stats.rx_bytes += rx->skb->len;
2165 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2166 !is_multicast_ether_addr(
2167 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2168 (!local->scanning &&
2169 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2170 mod_timer(&local->dynamic_ps_timer, jiffies +
2171 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2174 ieee80211_deliver_skb(rx);
2179 static ieee80211_rx_result debug_noinline
2180 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2182 struct sk_buff *skb = rx->skb;
2183 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2184 struct tid_ampdu_rx *tid_agg_rx;
2188 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2191 if (ieee80211_is_back_req(bar->frame_control)) {
2193 __le16 control, start_seq_num;
2194 } __packed bar_data;
2197 return RX_DROP_MONITOR;
2199 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2200 &bar_data, sizeof(bar_data)))
2201 return RX_DROP_MONITOR;
2203 tid = le16_to_cpu(bar_data.control) >> 12;
2205 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2207 return RX_DROP_MONITOR;
2209 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2211 /* reset session timer */
2212 if (tid_agg_rx->timeout)
2213 mod_timer(&tid_agg_rx->session_timer,
2214 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2216 spin_lock(&tid_agg_rx->reorder_lock);
2217 /* release stored frames up to start of BAR */
2218 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2220 spin_unlock(&tid_agg_rx->reorder_lock);
2227 * After this point, we only want management frames,
2228 * so we can drop all remaining control frames to
2229 * cooked monitor interfaces.
2231 return RX_DROP_MONITOR;
2234 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2235 struct ieee80211_mgmt *mgmt,
2238 struct ieee80211_local *local = sdata->local;
2239 struct sk_buff *skb;
2240 struct ieee80211_mgmt *resp;
2242 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2243 /* Not to own unicast address */
2247 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2248 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2249 /* Not from the current AP or not associated yet. */
2253 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2254 /* Too short SA Query request frame */
2258 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2262 skb_reserve(skb, local->hw.extra_tx_headroom);
2263 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2264 memset(resp, 0, 24);
2265 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2266 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2267 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2268 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2269 IEEE80211_STYPE_ACTION);
2270 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2271 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2272 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2273 memcpy(resp->u.action.u.sa_query.trans_id,
2274 mgmt->u.action.u.sa_query.trans_id,
2275 WLAN_SA_QUERY_TR_ID_LEN);
2277 ieee80211_tx_skb(sdata, skb);
2280 static ieee80211_rx_result debug_noinline
2281 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2283 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2284 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2287 * From here on, look only at management frames.
2288 * Data and control frames are already handled,
2289 * and unknown (reserved) frames are useless.
2291 if (rx->skb->len < 24)
2292 return RX_DROP_MONITOR;
2294 if (!ieee80211_is_mgmt(mgmt->frame_control))
2295 return RX_DROP_MONITOR;
2297 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2298 ieee80211_is_beacon(mgmt->frame_control) &&
2299 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2302 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2303 sig = status->signal;
2305 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2306 rx->skb->data, rx->skb->len,
2308 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2311 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2312 return RX_DROP_MONITOR;
2314 if (ieee80211_drop_unencrypted_mgmt(rx))
2315 return RX_DROP_UNUSABLE;
2320 static ieee80211_rx_result debug_noinline
2321 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2323 struct ieee80211_local *local = rx->local;
2324 struct ieee80211_sub_if_data *sdata = rx->sdata;
2325 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2326 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2327 int len = rx->skb->len;
2329 if (!ieee80211_is_action(mgmt->frame_control))
2332 /* drop too small frames */
2333 if (len < IEEE80211_MIN_ACTION_SIZE)
2334 return RX_DROP_UNUSABLE;
2336 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2337 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
2338 return RX_DROP_UNUSABLE;
2340 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2341 return RX_DROP_UNUSABLE;
2343 switch (mgmt->u.action.category) {
2344 case WLAN_CATEGORY_HT:
2345 /* reject HT action frames from stations not supporting HT */
2346 if (!rx->sta->sta.ht_cap.ht_supported)
2349 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2350 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2351 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2352 sdata->vif.type != NL80211_IFTYPE_AP &&
2353 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2356 /* verify action & smps_control are present */
2357 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2360 switch (mgmt->u.action.u.ht_smps.action) {
2361 case WLAN_HT_ACTION_SMPS: {
2362 struct ieee80211_supported_band *sband;
2365 /* convert to HT capability */
2366 switch (mgmt->u.action.u.ht_smps.smps_control) {
2367 case WLAN_HT_SMPS_CONTROL_DISABLED:
2368 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2370 case WLAN_HT_SMPS_CONTROL_STATIC:
2371 smps = WLAN_HT_CAP_SM_PS_STATIC;
2373 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2374 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2379 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2381 /* if no change do nothing */
2382 if ((rx->sta->sta.ht_cap.cap &
2383 IEEE80211_HT_CAP_SM_PS) == smps)
2386 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2387 rx->sta->sta.ht_cap.cap |= smps;
2389 sband = rx->local->hw.wiphy->bands[status->band];
2391 rate_control_rate_update(local, sband, rx->sta,
2392 IEEE80211_RC_SMPS_CHANGED);
2400 case WLAN_CATEGORY_BACK:
2401 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2402 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2403 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2404 sdata->vif.type != NL80211_IFTYPE_AP &&
2405 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2408 /* verify action_code is present */
2409 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2412 switch (mgmt->u.action.u.addba_req.action_code) {
2413 case WLAN_ACTION_ADDBA_REQ:
2414 if (len < (IEEE80211_MIN_ACTION_SIZE +
2415 sizeof(mgmt->u.action.u.addba_req)))
2418 case WLAN_ACTION_ADDBA_RESP:
2419 if (len < (IEEE80211_MIN_ACTION_SIZE +
2420 sizeof(mgmt->u.action.u.addba_resp)))
2423 case WLAN_ACTION_DELBA:
2424 if (len < (IEEE80211_MIN_ACTION_SIZE +
2425 sizeof(mgmt->u.action.u.delba)))
2433 case WLAN_CATEGORY_SPECTRUM_MGMT:
2434 if (status->band != IEEE80211_BAND_5GHZ)
2437 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2440 /* verify action_code is present */
2441 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2444 switch (mgmt->u.action.u.measurement.action_code) {
2445 case WLAN_ACTION_SPCT_MSR_REQ:
2446 if (len < (IEEE80211_MIN_ACTION_SIZE +
2447 sizeof(mgmt->u.action.u.measurement)))
2449 ieee80211_process_measurement_req(sdata, mgmt, len);
2451 case WLAN_ACTION_SPCT_CHL_SWITCH:
2452 if (len < (IEEE80211_MIN_ACTION_SIZE +
2453 sizeof(mgmt->u.action.u.chan_switch)))
2456 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2459 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2465 case WLAN_CATEGORY_SA_QUERY:
2466 if (len < (IEEE80211_MIN_ACTION_SIZE +
2467 sizeof(mgmt->u.action.u.sa_query)))
2470 switch (mgmt->u.action.u.sa_query.action) {
2471 case WLAN_ACTION_SA_QUERY_REQUEST:
2472 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2474 ieee80211_process_sa_query_req(sdata, mgmt, len);
2478 case WLAN_CATEGORY_SELF_PROTECTED:
2479 if (len < (IEEE80211_MIN_ACTION_SIZE +
2480 sizeof(mgmt->u.action.u.self_prot.action_code)))
2483 switch (mgmt->u.action.u.self_prot.action_code) {
2484 case WLAN_SP_MESH_PEERING_OPEN:
2485 case WLAN_SP_MESH_PEERING_CLOSE:
2486 case WLAN_SP_MESH_PEERING_CONFIRM:
2487 if (!ieee80211_vif_is_mesh(&sdata->vif))
2489 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2490 /* userspace handles this frame */
2493 case WLAN_SP_MGK_INFORM:
2494 case WLAN_SP_MGK_ACK:
2495 if (!ieee80211_vif_is_mesh(&sdata->vif))
2500 case WLAN_CATEGORY_MESH_ACTION:
2501 if (len < (IEEE80211_MIN_ACTION_SIZE +
2502 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2505 if (!ieee80211_vif_is_mesh(&sdata->vif))
2507 if (mesh_action_is_path_sel(mgmt) &&
2508 !mesh_path_sel_is_hwmp(sdata))
2516 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2517 /* will return in the next handlers */
2522 rx->sta->rx_packets++;
2523 dev_kfree_skb(rx->skb);
2527 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2528 skb_queue_tail(&sdata->skb_queue, rx->skb);
2529 ieee80211_queue_work(&local->hw, &sdata->work);
2531 rx->sta->rx_packets++;
2535 static ieee80211_rx_result debug_noinline
2536 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2538 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2541 /* skip known-bad action frames and return them in the next handler */
2542 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2546 * Getting here means the kernel doesn't know how to handle
2547 * it, but maybe userspace does ... include returned frames
2548 * so userspace can register for those to know whether ones
2549 * it transmitted were processed or returned.
2552 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2553 sig = status->signal;
2555 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2556 rx->skb->data, rx->skb->len,
2559 rx->sta->rx_packets++;
2560 dev_kfree_skb(rx->skb);
2567 static ieee80211_rx_result debug_noinline
2568 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2570 struct ieee80211_local *local = rx->local;
2571 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2572 struct sk_buff *nskb;
2573 struct ieee80211_sub_if_data *sdata = rx->sdata;
2574 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2576 if (!ieee80211_is_action(mgmt->frame_control))
2580 * For AP mode, hostapd is responsible for handling any action
2581 * frames that we didn't handle, including returning unknown
2582 * ones. For all other modes we will return them to the sender,
2583 * setting the 0x80 bit in the action category, as required by
2584 * 802.11-2012 9.24.4.
2585 * Newer versions of hostapd shall also use the management frame
2586 * registration mechanisms, but older ones still use cooked
2587 * monitor interfaces so push all frames there.
2589 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2590 (sdata->vif.type == NL80211_IFTYPE_AP ||
2591 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2592 return RX_DROP_MONITOR;
2594 if (is_multicast_ether_addr(mgmt->da))
2595 return RX_DROP_MONITOR;
2597 /* do not return rejected action frames */
2598 if (mgmt->u.action.category & 0x80)
2599 return RX_DROP_UNUSABLE;
2601 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2604 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2606 nmgmt->u.action.category |= 0x80;
2607 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2608 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2610 memset(nskb->cb, 0, sizeof(nskb->cb));
2612 ieee80211_tx_skb(rx->sdata, nskb);
2614 dev_kfree_skb(rx->skb);
2618 static ieee80211_rx_result debug_noinline
2619 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2621 struct ieee80211_sub_if_data *sdata = rx->sdata;
2622 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2625 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2627 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2628 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2629 sdata->vif.type != NL80211_IFTYPE_STATION)
2630 return RX_DROP_MONITOR;
2633 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2634 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2635 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2636 /* process for all: mesh, mlme, ibss */
2638 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2639 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2640 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2641 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2642 if (is_multicast_ether_addr(mgmt->da) &&
2643 !is_broadcast_ether_addr(mgmt->da))
2644 return RX_DROP_MONITOR;
2646 /* process only for station */
2647 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2648 return RX_DROP_MONITOR;
2650 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2651 /* process only for ibss */
2652 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2653 return RX_DROP_MONITOR;
2656 return RX_DROP_MONITOR;
2659 /* queue up frame and kick off work to process it */
2660 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2661 skb_queue_tail(&sdata->skb_queue, rx->skb);
2662 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2664 rx->sta->rx_packets++;
2669 /* TODO: use IEEE80211_RX_FRAGMENTED */
2670 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2671 struct ieee80211_rate *rate)
2673 struct ieee80211_sub_if_data *sdata;
2674 struct ieee80211_local *local = rx->local;
2675 struct sk_buff *skb = rx->skb, *skb2;
2676 struct net_device *prev_dev = NULL;
2677 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2678 int needed_headroom;
2681 * If cooked monitor has been processed already, then
2682 * don't do it again. If not, set the flag.
2684 if (rx->flags & IEEE80211_RX_CMNTR)
2686 rx->flags |= IEEE80211_RX_CMNTR;
2688 /* If there are no cooked monitor interfaces, just free the SKB */
2689 if (!local->cooked_mntrs)
2692 /* room for the radiotap header based on driver features */
2693 needed_headroom = ieee80211_rx_radiotap_space(local, status);
2695 if (skb_headroom(skb) < needed_headroom &&
2696 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2699 /* prepend radiotap information */
2700 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2703 skb_set_mac_header(skb, 0);
2704 skb->ip_summed = CHECKSUM_UNNECESSARY;
2705 skb->pkt_type = PACKET_OTHERHOST;
2706 skb->protocol = htons(ETH_P_802_2);
2708 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2709 if (!ieee80211_sdata_running(sdata))
2712 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2713 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2717 skb2 = skb_clone(skb, GFP_ATOMIC);
2719 skb2->dev = prev_dev;
2720 netif_receive_skb(skb2);
2724 prev_dev = sdata->dev;
2725 sdata->dev->stats.rx_packets++;
2726 sdata->dev->stats.rx_bytes += skb->len;
2730 skb->dev = prev_dev;
2731 netif_receive_skb(skb);
2739 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2740 ieee80211_rx_result res)
2743 case RX_DROP_MONITOR:
2744 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2746 rx->sta->rx_dropped++;
2749 struct ieee80211_rate *rate = NULL;
2750 struct ieee80211_supported_band *sband;
2751 struct ieee80211_rx_status *status;
2753 status = IEEE80211_SKB_RXCB((rx->skb));
2755 sband = rx->local->hw.wiphy->bands[status->band];
2756 if (!(status->flag & RX_FLAG_HT) &&
2757 !(status->flag & RX_FLAG_VHT))
2758 rate = &sband->bitrates[status->rate_idx];
2760 ieee80211_rx_cooked_monitor(rx, rate);
2763 case RX_DROP_UNUSABLE:
2764 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2766 rx->sta->rx_dropped++;
2767 dev_kfree_skb(rx->skb);
2770 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2775 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2777 ieee80211_rx_result res = RX_DROP_MONITOR;
2778 struct sk_buff *skb;
2780 #define CALL_RXH(rxh) \
2783 if (res != RX_CONTINUE) \
2787 spin_lock(&rx->local->rx_skb_queue.lock);
2788 if (rx->local->running_rx_handler)
2791 rx->local->running_rx_handler = true;
2793 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2794 spin_unlock(&rx->local->rx_skb_queue.lock);
2797 * all the other fields are valid across frames
2798 * that belong to an aMPDU since they are on the
2799 * same TID from the same station
2803 CALL_RXH(ieee80211_rx_h_decrypt)
2804 CALL_RXH(ieee80211_rx_h_check_more_data)
2805 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2806 CALL_RXH(ieee80211_rx_h_sta_process)
2807 CALL_RXH(ieee80211_rx_h_defragment)
2808 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2809 /* must be after MMIC verify so header is counted in MPDU mic */
2810 #ifdef CONFIG_MAC80211_MESH
2811 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2812 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2814 CALL_RXH(ieee80211_rx_h_amsdu)
2815 CALL_RXH(ieee80211_rx_h_data)
2816 CALL_RXH(ieee80211_rx_h_ctrl);
2817 CALL_RXH(ieee80211_rx_h_mgmt_check)
2818 CALL_RXH(ieee80211_rx_h_action)
2819 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2820 CALL_RXH(ieee80211_rx_h_action_return)
2821 CALL_RXH(ieee80211_rx_h_mgmt)
2824 ieee80211_rx_handlers_result(rx, res);
2825 spin_lock(&rx->local->rx_skb_queue.lock);
2829 rx->local->running_rx_handler = false;
2832 spin_unlock(&rx->local->rx_skb_queue.lock);
2835 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2837 ieee80211_rx_result res = RX_DROP_MONITOR;
2839 #define CALL_RXH(rxh) \
2842 if (res != RX_CONTINUE) \
2846 CALL_RXH(ieee80211_rx_h_check)
2848 ieee80211_rx_reorder_ampdu(rx);
2850 ieee80211_rx_handlers(rx);
2854 ieee80211_rx_handlers_result(rx, res);
2860 * This function makes calls into the RX path, therefore
2861 * it has to be invoked under RCU read lock.
2863 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2865 struct ieee80211_rx_data rx = {
2867 .sdata = sta->sdata,
2868 .local = sta->local,
2869 /* This is OK -- must be QoS data frame */
2870 .security_idx = tid,
2874 struct tid_ampdu_rx *tid_agg_rx;
2876 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2880 spin_lock(&tid_agg_rx->reorder_lock);
2881 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2882 spin_unlock(&tid_agg_rx->reorder_lock);
2884 ieee80211_rx_handlers(&rx);
2887 /* main receive path */
2889 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2890 struct ieee80211_hdr *hdr)
2892 struct ieee80211_sub_if_data *sdata = rx->sdata;
2893 struct sk_buff *skb = rx->skb;
2894 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2895 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2896 int multicast = is_multicast_ether_addr(hdr->addr1);
2898 switch (sdata->vif.type) {
2899 case NL80211_IFTYPE_STATION:
2900 if (!bssid && !sdata->u.mgd.use_4addr)
2903 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2904 if (!(sdata->dev->flags & IFF_PROMISC) ||
2905 sdata->u.mgd.use_4addr)
2907 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2910 case NL80211_IFTYPE_ADHOC:
2913 if (ieee80211_is_beacon(hdr->frame_control)) {
2915 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2917 } else if (!multicast &&
2918 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2919 if (!(sdata->dev->flags & IFF_PROMISC))
2921 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2922 } else if (!rx->sta) {
2924 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
2925 rate_idx = 0; /* TODO: HT/VHT rates */
2927 rate_idx = status->rate_idx;
2928 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2932 case NL80211_IFTYPE_MESH_POINT:
2934 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2935 if (!(sdata->dev->flags & IFF_PROMISC))
2938 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2941 case NL80211_IFTYPE_AP_VLAN:
2942 case NL80211_IFTYPE_AP:
2944 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2946 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
2948 * Accept public action frames even when the
2949 * BSSID doesn't match, this is used for P2P
2950 * and location updates. Note that mac80211
2951 * itself never looks at these frames.
2953 if (ieee80211_is_public_action(hdr, skb->len))
2955 if (!ieee80211_is_beacon(hdr->frame_control))
2957 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2960 case NL80211_IFTYPE_WDS:
2961 if (bssid || !ieee80211_is_data(hdr->frame_control))
2963 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
2966 case NL80211_IFTYPE_P2P_DEVICE:
2967 if (!ieee80211_is_public_action(hdr, skb->len) &&
2968 !ieee80211_is_probe_req(hdr->frame_control) &&
2969 !ieee80211_is_probe_resp(hdr->frame_control) &&
2970 !ieee80211_is_beacon(hdr->frame_control))
2972 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2973 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2976 /* should never get here */
2985 * This function returns whether or not the SKB
2986 * was destined for RX processing or not, which,
2987 * if consume is true, is equivalent to whether
2988 * or not the skb was consumed.
2990 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2991 struct sk_buff *skb, bool consume)
2993 struct ieee80211_local *local = rx->local;
2994 struct ieee80211_sub_if_data *sdata = rx->sdata;
2995 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2996 struct ieee80211_hdr *hdr = (void *)skb->data;
3000 status->rx_flags |= IEEE80211_RX_RA_MATCH;
3001 prepares = prepare_for_handlers(rx, hdr);
3007 skb = skb_copy(skb, GFP_ATOMIC);
3009 if (net_ratelimit())
3010 wiphy_debug(local->hw.wiphy,
3011 "failed to copy skb for %s\n",
3019 ieee80211_invoke_rx_handlers(rx);
3024 * This is the actual Rx frames handler. as it blongs to Rx path it must
3025 * be called with rcu_read_lock protection.
3027 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3028 struct sk_buff *skb)
3030 struct ieee80211_local *local = hw_to_local(hw);
3031 struct ieee80211_sub_if_data *sdata;
3032 struct ieee80211_hdr *hdr;
3034 struct ieee80211_rx_data rx;
3035 struct ieee80211_sub_if_data *prev;
3036 struct sta_info *sta, *tmp, *prev_sta;
3039 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3040 memset(&rx, 0, sizeof(rx));
3044 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3045 local->dot11ReceivedFragmentCount++;
3047 if (ieee80211_is_mgmt(fc)) {
3048 /* drop frame if too short for header */
3049 if (skb->len < ieee80211_hdrlen(fc))
3052 err = skb_linearize(skb);
3054 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3062 hdr = (struct ieee80211_hdr *)skb->data;
3063 ieee80211_parse_qos(&rx);
3064 ieee80211_verify_alignment(&rx);
3066 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3067 ieee80211_is_beacon(hdr->frame_control)))
3068 ieee80211_scan_rx(local, skb);
3070 if (ieee80211_is_data(fc)) {
3073 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3080 rx.sdata = prev_sta->sdata;
3081 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3088 rx.sdata = prev_sta->sdata;
3090 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3098 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3099 if (!ieee80211_sdata_running(sdata))
3102 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3103 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3107 * frame is destined for this interface, but if it's
3108 * not also for the previous one we handle that after
3109 * the loop to avoid copying the SKB once too much
3117 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3119 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3125 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3128 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3137 * This is the receive path handler. It is called by a low level driver when an
3138 * 802.11 MPDU is received from the hardware.
3140 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3142 struct ieee80211_local *local = hw_to_local(hw);
3143 struct ieee80211_rate *rate = NULL;
3144 struct ieee80211_supported_band *sband;
3145 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3147 WARN_ON_ONCE(softirq_count() == 0);
3149 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3152 sband = local->hw.wiphy->bands[status->band];
3153 if (WARN_ON(!sband))
3157 * If we're suspending, it is possible although not too likely
3158 * that we'd be receiving frames after having already partially
3159 * quiesced the stack. We can't process such frames then since
3160 * that might, for example, cause stations to be added or other
3161 * driver callbacks be invoked.
3163 if (unlikely(local->quiescing || local->suspended))
3166 /* We might be during a HW reconfig, prevent Rx for the same reason */
3167 if (unlikely(local->in_reconfig))
3171 * The same happens when we're not even started,
3172 * but that's worth a warning.
3174 if (WARN_ON(!local->started))
3177 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3179 * Validate the rate, unless a PLCP error means that
3180 * we probably can't have a valid rate here anyway.
3183 if (status->flag & RX_FLAG_HT) {
3185 * rate_idx is MCS index, which can be [0-76]
3188 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3190 * Anything else would be some sort of driver or
3191 * hardware error. The driver should catch hardware
3194 if (WARN(status->rate_idx > 76,
3195 "Rate marked as an HT rate but passed "
3196 "status->rate_idx is not "
3197 "an MCS index [0-76]: %d (0x%02x)\n",
3201 } else if (status->flag & RX_FLAG_VHT) {
3202 if (WARN_ONCE(status->rate_idx > 9 ||
3204 status->vht_nss > 8,
3205 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3206 status->rate_idx, status->vht_nss))
3209 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3211 rate = &sband->bitrates[status->rate_idx];
3215 status->rx_flags = 0;
3218 * key references and virtual interfaces are protected using RCU
3219 * and this requires that we are in a read-side RCU section during
3220 * receive processing
3225 * Frames with failed FCS/PLCP checksum are not returned,
3226 * all other frames are returned without radiotap header
3227 * if it was previously present.
3228 * Also, frames with less than 16 bytes are dropped.
3230 skb = ieee80211_rx_monitor(local, skb, rate);
3236 ieee80211_tpt_led_trig_rx(local,
3237 ((struct ieee80211_hdr *)skb->data)->frame_control,
3239 __ieee80211_rx_handle_packet(hw, skb);
3247 EXPORT_SYMBOL(ieee80211_rx);
3249 /* This is a version of the rx handler that can be called from hard irq
3250 * context. Post the skb on the queue and schedule the tasklet */
3251 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3253 struct ieee80211_local *local = hw_to_local(hw);
3255 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3257 skb->pkt_type = IEEE80211_RX_MSG;
3258 skb_queue_tail(&local->skb_queue, skb);
3259 tasklet_schedule(&local->tasklet);
3261 EXPORT_SYMBOL(ieee80211_rx_irqsafe);