2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <linux/export.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
23 #include "ieee80211_i.h"
24 #include "driver-ops.h"
34 * monitor mode reception
36 * This function cleans up the SKB, i.e. it removes all the stuff
37 * only useful for monitoring.
39 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
42 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
43 if (likely(skb->len > FCS_LEN))
44 __pskb_trim(skb, skb->len - FCS_LEN);
56 static inline int should_drop_frame(struct sk_buff *skb,
59 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
60 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
62 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
64 if (unlikely(skb->len < 16 + present_fcs_len))
66 if (ieee80211_is_ctl(hdr->frame_control) &&
67 !ieee80211_is_pspoll(hdr->frame_control) &&
68 !ieee80211_is_back_req(hdr->frame_control))
74 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
75 struct ieee80211_rx_status *status)
79 /* always present fields */
80 len = sizeof(struct ieee80211_radiotap_header) + 9;
82 if (status->flag & RX_FLAG_MACTIME_MPDU)
84 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
87 if (len & 1) /* padding for RX_FLAGS if necessary */
90 if (status->flag & RX_FLAG_HT) /* HT info */
97 * ieee80211_add_rx_radiotap_header - add radiotap header
99 * add a radiotap header containing all the fields which the hardware provided.
102 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
104 struct ieee80211_rate *rate,
107 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
108 struct ieee80211_radiotap_header *rthdr;
112 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
113 memset(rthdr, 0, rtap_len);
115 /* radiotap header, set always present flags */
117 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
118 (1 << IEEE80211_RADIOTAP_CHANNEL) |
119 (1 << IEEE80211_RADIOTAP_ANTENNA) |
120 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
121 rthdr->it_len = cpu_to_le16(rtap_len);
123 pos = (unsigned char *)(rthdr+1);
125 /* the order of the following fields is important */
127 /* IEEE80211_RADIOTAP_TSFT */
128 if (status->flag & RX_FLAG_MACTIME_MPDU) {
129 put_unaligned_le64(status->mactime, pos);
131 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
135 /* IEEE80211_RADIOTAP_FLAGS */
136 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
137 *pos |= IEEE80211_RADIOTAP_F_FCS;
138 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
139 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
140 if (status->flag & RX_FLAG_SHORTPRE)
141 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
144 /* IEEE80211_RADIOTAP_RATE */
145 if (!rate || status->flag & RX_FLAG_HT) {
147 * Without rate information don't add it. If we have,
148 * MCS information is a separate field in radiotap,
149 * added below. The byte here is needed as padding
150 * for the channel though, so initialise it to 0.
154 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
155 *pos = rate->bitrate / 5;
159 /* IEEE80211_RADIOTAP_CHANNEL */
160 put_unaligned_le16(status->freq, pos);
162 if (status->band == IEEE80211_BAND_5GHZ)
163 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
165 else if (status->flag & RX_FLAG_HT)
166 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
168 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
169 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
172 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
175 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
178 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
179 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
180 *pos = status->signal;
182 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
186 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
188 /* IEEE80211_RADIOTAP_ANTENNA */
189 *pos = status->antenna;
192 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
194 /* IEEE80211_RADIOTAP_RX_FLAGS */
195 /* ensure 2 byte alignment for the 2 byte field as required */
196 if ((pos - (u8 *)rthdr) & 1)
198 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
199 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
200 put_unaligned_le16(rx_flags, pos);
203 if (status->flag & RX_FLAG_HT) {
204 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
205 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
206 IEEE80211_RADIOTAP_MCS_HAVE_GI |
207 IEEE80211_RADIOTAP_MCS_HAVE_BW;
209 if (status->flag & RX_FLAG_SHORT_GI)
210 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
211 if (status->flag & RX_FLAG_40MHZ)
212 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
214 *pos++ = status->rate_idx;
219 * This function copies a received frame to all monitor interfaces and
220 * returns a cleaned-up SKB that no longer includes the FCS nor the
221 * radiotap header the driver might have added.
223 static struct sk_buff *
224 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
225 struct ieee80211_rate *rate)
227 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
228 struct ieee80211_sub_if_data *sdata;
229 int needed_headroom = 0;
230 struct sk_buff *skb, *skb2;
231 struct net_device *prev_dev = NULL;
232 int present_fcs_len = 0;
235 * First, we may need to make a copy of the skb because
236 * (1) we need to modify it for radiotap (if not present), and
237 * (2) the other RX handlers will modify the skb we got.
239 * We don't need to, of course, if we aren't going to return
240 * the SKB because it has a bad FCS/PLCP checksum.
243 /* room for the radiotap header based on driver features */
244 needed_headroom = ieee80211_rx_radiotap_len(local, status);
246 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
247 present_fcs_len = FCS_LEN;
249 /* make sure hdr->frame_control is on the linear part */
250 if (!pskb_may_pull(origskb, 2)) {
251 dev_kfree_skb(origskb);
255 if (!local->monitors) {
256 if (should_drop_frame(origskb, present_fcs_len)) {
257 dev_kfree_skb(origskb);
261 return remove_monitor_info(local, origskb);
264 if (should_drop_frame(origskb, present_fcs_len)) {
265 /* only need to expand headroom if necessary */
270 * This shouldn't trigger often because most devices have an
271 * RX header they pull before we get here, and that should
272 * be big enough for our radiotap information. We should
273 * probably export the length to drivers so that we can have
274 * them allocate enough headroom to start with.
276 if (skb_headroom(skb) < needed_headroom &&
277 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
283 * Need to make a copy and possibly remove radiotap header
284 * and FCS from the original.
286 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
288 origskb = remove_monitor_info(local, origskb);
294 /* prepend radiotap information */
295 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
297 skb_reset_mac_header(skb);
298 skb->ip_summed = CHECKSUM_UNNECESSARY;
299 skb->pkt_type = PACKET_OTHERHOST;
300 skb->protocol = htons(ETH_P_802_2);
302 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
303 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
306 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
309 if (!ieee80211_sdata_running(sdata))
313 skb2 = skb_clone(skb, GFP_ATOMIC);
315 skb2->dev = prev_dev;
316 netif_receive_skb(skb2);
320 prev_dev = sdata->dev;
321 sdata->dev->stats.rx_packets++;
322 sdata->dev->stats.rx_bytes += skb->len;
327 netif_receive_skb(skb);
335 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
337 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
338 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
339 int tid, seqno_idx, security_idx;
341 /* does the frame have a qos control field? */
342 if (ieee80211_is_data_qos(hdr->frame_control)) {
343 u8 *qc = ieee80211_get_qos_ctl(hdr);
344 /* frame has qos control */
345 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
346 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
347 status->rx_flags |= IEEE80211_RX_AMSDU;
353 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
355 * Sequence numbers for management frames, QoS data
356 * frames with a broadcast/multicast address in the
357 * Address 1 field, and all non-QoS data frames sent
358 * by QoS STAs are assigned using an additional single
359 * modulo-4096 counter, [...]
361 * We also use that counter for non-QoS STAs.
363 seqno_idx = NUM_RX_DATA_QUEUES;
365 if (ieee80211_is_mgmt(hdr->frame_control))
366 security_idx = NUM_RX_DATA_QUEUES;
370 rx->seqno_idx = seqno_idx;
371 rx->security_idx = security_idx;
372 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
373 * For now, set skb->priority to 0 for other cases. */
374 rx->skb->priority = (tid > 7) ? 0 : tid;
378 * DOC: Packet alignment
380 * Drivers always need to pass packets that are aligned to two-byte boundaries
383 * Additionally, should, if possible, align the payload data in a way that
384 * guarantees that the contained IP header is aligned to a four-byte
385 * boundary. In the case of regular frames, this simply means aligning the
386 * payload to a four-byte boundary (because either the IP header is directly
387 * contained, or IV/RFC1042 headers that have a length divisible by four are
388 * in front of it). If the payload data is not properly aligned and the
389 * architecture doesn't support efficient unaligned operations, mac80211
390 * will align the data.
392 * With A-MSDU frames, however, the payload data address must yield two modulo
393 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
394 * push the IP header further back to a multiple of four again. Thankfully, the
395 * specs were sane enough this time around to require padding each A-MSDU
396 * subframe to a length that is a multiple of four.
398 * Padding like Atheros hardware adds which is between the 802.11 header and
399 * the payload is not supported, the driver is required to move the 802.11
400 * header to be directly in front of the payload in that case.
402 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
404 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
405 WARN_ONCE((unsigned long)rx->skb->data & 1,
406 "unaligned packet at 0x%p\n", rx->skb->data);
413 static ieee80211_rx_result debug_noinline
414 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
416 struct ieee80211_local *local = rx->local;
417 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
418 struct sk_buff *skb = rx->skb;
420 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
421 !local->sched_scanning))
424 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
425 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
426 local->sched_scanning)
427 return ieee80211_scan_rx(rx->sdata, skb);
429 /* scanning finished during invoking of handlers */
430 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
431 return RX_DROP_UNUSABLE;
435 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
437 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
439 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
442 return ieee80211_is_robust_mgmt_frame(hdr);
446 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
448 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
450 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
453 return ieee80211_is_robust_mgmt_frame(hdr);
457 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
458 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
460 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
461 struct ieee80211_mmie *mmie;
463 if (skb->len < 24 + sizeof(*mmie) ||
464 !is_multicast_ether_addr(hdr->da))
467 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
468 return -1; /* not a robust management frame */
470 mmie = (struct ieee80211_mmie *)
471 (skb->data + skb->len - sizeof(*mmie));
472 if (mmie->element_id != WLAN_EID_MMIE ||
473 mmie->length != sizeof(*mmie) - 2)
476 return le16_to_cpu(mmie->key_id);
480 static ieee80211_rx_result
481 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
484 char *dev_addr = rx->sdata->vif.addr;
486 if (ieee80211_is_data(hdr->frame_control)) {
487 if (is_multicast_ether_addr(hdr->addr1)) {
488 if (ieee80211_has_tods(hdr->frame_control) ||
489 !ieee80211_has_fromds(hdr->frame_control))
490 return RX_DROP_MONITOR;
491 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
492 return RX_DROP_MONITOR;
494 if (!ieee80211_has_a4(hdr->frame_control))
495 return RX_DROP_MONITOR;
496 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
497 return RX_DROP_MONITOR;
501 /* If there is not an established peer link and this is not a peer link
502 * establisment frame, beacon or probe, drop the frame.
505 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
506 struct ieee80211_mgmt *mgmt;
508 if (!ieee80211_is_mgmt(hdr->frame_control))
509 return RX_DROP_MONITOR;
511 if (ieee80211_is_action(hdr->frame_control)) {
513 mgmt = (struct ieee80211_mgmt *)hdr;
514 category = mgmt->u.action.category;
515 if (category != WLAN_CATEGORY_MESH_ACTION &&
516 category != WLAN_CATEGORY_SELF_PROTECTED)
517 return RX_DROP_MONITOR;
521 if (ieee80211_is_probe_req(hdr->frame_control) ||
522 ieee80211_is_probe_resp(hdr->frame_control) ||
523 ieee80211_is_beacon(hdr->frame_control) ||
524 ieee80211_is_auth(hdr->frame_control))
527 return RX_DROP_MONITOR;
534 #define SEQ_MODULO 0x1000
535 #define SEQ_MASK 0xfff
537 static inline int seq_less(u16 sq1, u16 sq2)
539 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
542 static inline u16 seq_inc(u16 sq)
544 return (sq + 1) & SEQ_MASK;
547 static inline u16 seq_sub(u16 sq1, u16 sq2)
549 return (sq1 - sq2) & SEQ_MASK;
553 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
554 struct tid_ampdu_rx *tid_agg_rx,
557 struct ieee80211_local *local = hw_to_local(hw);
558 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
559 struct ieee80211_rx_status *status;
561 lockdep_assert_held(&tid_agg_rx->reorder_lock);
566 /* release the frame from the reorder ring buffer */
567 tid_agg_rx->stored_mpdu_num--;
568 tid_agg_rx->reorder_buf[index] = NULL;
569 status = IEEE80211_SKB_RXCB(skb);
570 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
571 skb_queue_tail(&local->rx_skb_queue, skb);
574 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
577 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
578 struct tid_ampdu_rx *tid_agg_rx,
583 lockdep_assert_held(&tid_agg_rx->reorder_lock);
585 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
586 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
587 tid_agg_rx->buf_size;
588 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
593 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
594 * the skb was added to the buffer longer than this time ago, the earlier
595 * frames that have not yet been received are assumed to be lost and the skb
596 * can be released for processing. This may also release other skb's from the
597 * reorder buffer if there are no additional gaps between the frames.
599 * Callers must hold tid_agg_rx->reorder_lock.
601 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
603 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
604 struct tid_ampdu_rx *tid_agg_rx)
608 lockdep_assert_held(&tid_agg_rx->reorder_lock);
610 /* release the buffer until next missing frame */
611 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
612 tid_agg_rx->buf_size;
613 if (!tid_agg_rx->reorder_buf[index] &&
614 tid_agg_rx->stored_mpdu_num > 1) {
616 * No buffers ready to be released, but check whether any
617 * frames in the reorder buffer have timed out.
620 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
621 j = (j + 1) % tid_agg_rx->buf_size) {
622 if (!tid_agg_rx->reorder_buf[j]) {
627 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
628 HT_RX_REORDER_BUF_TIMEOUT))
629 goto set_release_timer;
631 #ifdef CONFIG_MAC80211_HT_DEBUG
633 wiphy_debug(hw->wiphy,
634 "release an RX reorder frame due to timeout on earlier frames\n");
636 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
639 * Increment the head seq# also for the skipped slots.
641 tid_agg_rx->head_seq_num =
642 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
645 } else while (tid_agg_rx->reorder_buf[index]) {
646 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
647 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
648 tid_agg_rx->buf_size;
651 if (tid_agg_rx->stored_mpdu_num) {
652 j = index = seq_sub(tid_agg_rx->head_seq_num,
653 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
655 for (; j != (index - 1) % tid_agg_rx->buf_size;
656 j = (j + 1) % tid_agg_rx->buf_size) {
657 if (tid_agg_rx->reorder_buf[j])
663 mod_timer(&tid_agg_rx->reorder_timer,
664 tid_agg_rx->reorder_time[j] + 1 +
665 HT_RX_REORDER_BUF_TIMEOUT);
667 del_timer(&tid_agg_rx->reorder_timer);
672 * As this function belongs to the RX path it must be under
673 * rcu_read_lock protection. It returns false if the frame
674 * can be processed immediately, true if it was consumed.
676 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
677 struct tid_ampdu_rx *tid_agg_rx,
680 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
681 u16 sc = le16_to_cpu(hdr->seq_ctrl);
682 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
683 u16 head_seq_num, buf_size;
687 spin_lock(&tid_agg_rx->reorder_lock);
689 buf_size = tid_agg_rx->buf_size;
690 head_seq_num = tid_agg_rx->head_seq_num;
692 /* frame with out of date sequence number */
693 if (seq_less(mpdu_seq_num, head_seq_num)) {
699 * If frame the sequence number exceeds our buffering window
700 * size release some previous frames to make room for this one.
702 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
703 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
704 /* release stored frames up to new head to stack */
705 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
708 /* Now the new frame is always in the range of the reordering buffer */
710 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
712 /* check if we already stored this frame */
713 if (tid_agg_rx->reorder_buf[index]) {
719 * If the current MPDU is in the right order and nothing else
720 * is stored we can process it directly, no need to buffer it.
721 * If it is first but there's something stored, we may be able
722 * to release frames after this one.
724 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
725 tid_agg_rx->stored_mpdu_num == 0) {
726 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
731 /* put the frame in the reordering buffer */
732 tid_agg_rx->reorder_buf[index] = skb;
733 tid_agg_rx->reorder_time[index] = jiffies;
734 tid_agg_rx->stored_mpdu_num++;
735 ieee80211_sta_reorder_release(hw, tid_agg_rx);
738 spin_unlock(&tid_agg_rx->reorder_lock);
743 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
744 * true if the MPDU was buffered, false if it should be processed.
746 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
748 struct sk_buff *skb = rx->skb;
749 struct ieee80211_local *local = rx->local;
750 struct ieee80211_hw *hw = &local->hw;
751 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
752 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
753 struct sta_info *sta = rx->sta;
754 struct tid_ampdu_rx *tid_agg_rx;
758 if (!ieee80211_is_data_qos(hdr->frame_control))
762 * filter the QoS data rx stream according to
763 * STA/TID and check if this STA/TID is on aggregation
769 ack_policy = *ieee80211_get_qos_ctl(hdr) &
770 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
771 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
773 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
777 /* qos null data frames are excluded */
778 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
781 /* not part of a BA session */
782 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
783 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
786 /* not actually part of this BA session */
787 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
790 /* new, potentially un-ordered, ampdu frame - process it */
792 /* reset session timer */
793 if (tid_agg_rx->timeout)
794 mod_timer(&tid_agg_rx->session_timer,
795 TU_TO_EXP_TIME(tid_agg_rx->timeout));
797 /* if this mpdu is fragmented - terminate rx aggregation session */
798 sc = le16_to_cpu(hdr->seq_ctrl);
799 if (sc & IEEE80211_SCTL_FRAG) {
800 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
801 skb_queue_tail(&rx->sdata->skb_queue, skb);
802 ieee80211_queue_work(&local->hw, &rx->sdata->work);
807 * No locking needed -- we will only ever process one
808 * RX packet at a time, and thus own tid_agg_rx. All
809 * other code manipulating it needs to (and does) make
810 * sure that we cannot get to it any more before doing
813 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
817 skb_queue_tail(&local->rx_skb_queue, skb);
820 static ieee80211_rx_result debug_noinline
821 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
824 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
826 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
827 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
828 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
829 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
831 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
832 rx->local->dot11FrameDuplicateCount++;
833 rx->sta->num_duplicates++;
835 return RX_DROP_UNUSABLE;
837 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
840 if (unlikely(rx->skb->len < 16)) {
841 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
842 return RX_DROP_MONITOR;
845 /* Drop disallowed frame classes based on STA auth/assoc state;
846 * IEEE 802.11, Chap 5.5.
848 * mac80211 filters only based on association state, i.e. it drops
849 * Class 3 frames from not associated stations. hostapd sends
850 * deauth/disassoc frames when needed. In addition, hostapd is
851 * responsible for filtering on both auth and assoc states.
854 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
855 return ieee80211_rx_mesh_check(rx);
857 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
858 ieee80211_is_pspoll(hdr->frame_control)) &&
859 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
860 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
861 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
863 * accept port control frames from the AP even when it's not
864 * yet marked ASSOC to prevent a race where we don't set the
865 * assoc bit quickly enough before it sends the first frame
867 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
868 ieee80211_is_data_present(hdr->frame_control)) {
872 payload = rx->skb->data +
873 ieee80211_hdrlen(hdr->frame_control);
874 ethertype = (payload[6] << 8) | payload[7];
875 if (cpu_to_be16(ethertype) ==
876 rx->sdata->control_port_protocol)
880 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
881 cfg80211_rx_spurious_frame(rx->sdata->dev,
884 return RX_DROP_UNUSABLE;
886 return RX_DROP_MONITOR;
893 static ieee80211_rx_result debug_noinline
894 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
896 struct sk_buff *skb = rx->skb;
897 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
898 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
901 ieee80211_rx_result result = RX_DROP_UNUSABLE;
902 struct ieee80211_key *sta_ptk = NULL;
903 int mmie_keyidx = -1;
909 * There are four types of keys:
911 * - IGTK (group keys for management frames)
912 * - PTK (pairwise keys)
913 * - STK (station-to-station pairwise keys)
915 * When selecting a key, we have to distinguish between multicast
916 * (including broadcast) and unicast frames, the latter can only
917 * use PTKs and STKs while the former always use GTKs and IGTKs.
918 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
919 * unicast frames can also use key indices like GTKs. Hence, if we
920 * don't have a PTK/STK we check the key index for a WEP key.
922 * Note that in a regular BSS, multicast frames are sent by the
923 * AP only, associated stations unicast the frame to the AP first
924 * which then multicasts it on their behalf.
926 * There is also a slight problem in IBSS mode: GTKs are negotiated
927 * with each station, that is something we don't currently handle.
928 * The spec seems to expect that one negotiates the same key with
929 * every station but there's no such requirement; VLANs could be
934 * No point in finding a key and decrypting if the frame is neither
935 * addressed to us nor a multicast frame.
937 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
940 /* start without a key */
944 sta_ptk = rcu_dereference(rx->sta->ptk);
946 fc = hdr->frame_control;
948 if (!ieee80211_has_protected(fc))
949 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
951 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
953 if ((status->flag & RX_FLAG_DECRYPTED) &&
954 (status->flag & RX_FLAG_IV_STRIPPED))
956 /* Skip decryption if the frame is not protected. */
957 if (!ieee80211_has_protected(fc))
959 } else if (mmie_keyidx >= 0) {
960 /* Broadcast/multicast robust management frame / BIP */
961 if ((status->flag & RX_FLAG_DECRYPTED) &&
962 (status->flag & RX_FLAG_IV_STRIPPED))
965 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
966 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
967 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
969 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
971 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
972 } else if (!ieee80211_has_protected(fc)) {
974 * The frame was not protected, so skip decryption. However, we
975 * need to set rx->key if there is a key that could have been
976 * used so that the frame may be dropped if encryption would
977 * have been expected.
979 struct ieee80211_key *key = NULL;
980 struct ieee80211_sub_if_data *sdata = rx->sdata;
983 if (ieee80211_is_mgmt(fc) &&
984 is_multicast_ether_addr(hdr->addr1) &&
985 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
989 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
990 key = rcu_dereference(rx->sta->gtk[i]);
996 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
997 key = rcu_dereference(sdata->keys[i]);
1009 * The device doesn't give us the IV so we won't be
1010 * able to look up the key. That's ok though, we
1011 * don't need to decrypt the frame, we just won't
1012 * be able to keep statistics accurate.
1013 * Except for key threshold notifications, should
1014 * we somehow allow the driver to tell us which key
1015 * the hardware used if this flag is set?
1017 if ((status->flag & RX_FLAG_DECRYPTED) &&
1018 (status->flag & RX_FLAG_IV_STRIPPED))
1021 hdrlen = ieee80211_hdrlen(fc);
1023 if (rx->skb->len < 8 + hdrlen)
1024 return RX_DROP_UNUSABLE; /* TODO: count this? */
1027 * no need to call ieee80211_wep_get_keyidx,
1028 * it verifies a bunch of things we've done already
1030 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1031 keyidx = keyid >> 6;
1033 /* check per-station GTK first, if multicast packet */
1034 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1035 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1037 /* if not found, try default key */
1039 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1042 * RSNA-protected unicast frames should always be
1043 * sent with pairwise or station-to-station keys,
1044 * but for WEP we allow using a key index as well.
1047 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1048 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1049 !is_multicast_ether_addr(hdr->addr1))
1055 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1056 return RX_DROP_MONITOR;
1058 rx->key->tx_rx_count++;
1059 /* TODO: add threshold stuff again */
1061 return RX_DROP_MONITOR;
1064 if (skb_linearize(rx->skb))
1065 return RX_DROP_UNUSABLE;
1066 /* the hdr variable is invalid now! */
1068 switch (rx->key->conf.cipher) {
1069 case WLAN_CIPHER_SUITE_WEP40:
1070 case WLAN_CIPHER_SUITE_WEP104:
1071 /* Check for weak IVs if possible */
1072 if (rx->sta && ieee80211_is_data(fc) &&
1073 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1074 !(status->flag & RX_FLAG_DECRYPTED)) &&
1075 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1076 rx->sta->wep_weak_iv_count++;
1078 result = ieee80211_crypto_wep_decrypt(rx);
1080 case WLAN_CIPHER_SUITE_TKIP:
1081 result = ieee80211_crypto_tkip_decrypt(rx);
1083 case WLAN_CIPHER_SUITE_CCMP:
1084 result = ieee80211_crypto_ccmp_decrypt(rx);
1086 case WLAN_CIPHER_SUITE_AES_CMAC:
1087 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1091 * We can reach here only with HW-only algorithms
1092 * but why didn't it decrypt the frame?!
1094 return RX_DROP_UNUSABLE;
1097 /* either the frame has been decrypted or will be dropped */
1098 status->flag |= RX_FLAG_DECRYPTED;
1103 static ieee80211_rx_result debug_noinline
1104 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1106 struct ieee80211_local *local;
1107 struct ieee80211_hdr *hdr;
1108 struct sk_buff *skb;
1112 hdr = (struct ieee80211_hdr *) skb->data;
1114 if (!local->pspolling)
1117 if (!ieee80211_has_fromds(hdr->frame_control))
1118 /* this is not from AP */
1121 if (!ieee80211_is_data(hdr->frame_control))
1124 if (!ieee80211_has_moredata(hdr->frame_control)) {
1125 /* AP has no more frames buffered for us */
1126 local->pspolling = false;
1130 /* more data bit is set, let's request a new frame from the AP */
1131 ieee80211_send_pspoll(local, rx->sdata);
1136 static void ap_sta_ps_start(struct sta_info *sta)
1138 struct ieee80211_sub_if_data *sdata = sta->sdata;
1139 struct ieee80211_local *local = sdata->local;
1141 atomic_inc(&sdata->bss->num_sta_ps);
1142 set_sta_flag(sta, WLAN_STA_PS_STA);
1143 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1144 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1145 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1146 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1147 sdata->name, sta->sta.addr, sta->sta.aid);
1148 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1151 static void ap_sta_ps_end(struct sta_info *sta)
1153 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1154 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1155 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1156 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1158 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1159 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1160 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1161 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1162 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1166 ieee80211_sta_ps_deliver_wakeup(sta);
1169 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1171 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1174 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1176 /* Don't let the same PS state be set twice */
1177 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1178 if ((start && in_ps) || (!start && !in_ps))
1182 ap_sta_ps_start(sta_inf);
1184 ap_sta_ps_end(sta_inf);
1188 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1190 static ieee80211_rx_result debug_noinline
1191 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1193 struct ieee80211_sub_if_data *sdata = rx->sdata;
1194 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1195 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1198 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1201 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1202 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1206 * The device handles station powersave, so don't do anything about
1207 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1208 * it to mac80211 since they're handled.)
1210 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1214 * Don't do anything if the station isn't already asleep. In
1215 * the uAPSD case, the station will probably be marked asleep,
1216 * in the PS-Poll case the station must be confused ...
1218 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1221 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1222 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1223 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1224 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1226 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1229 /* Free PS Poll skb here instead of returning RX_DROP that would
1230 * count as an dropped frame. */
1231 dev_kfree_skb(rx->skb);
1234 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1235 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1236 ieee80211_has_pm(hdr->frame_control) &&
1237 (ieee80211_is_data_qos(hdr->frame_control) ||
1238 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1239 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1240 ac = ieee802_1d_to_ac[tid & 7];
1243 * If this AC is not trigger-enabled do nothing.
1245 * NB: This could/should check a separate bitmap of trigger-
1246 * enabled queues, but for now we only implement uAPSD w/o
1247 * TSPEC changes to the ACs, so they're always the same.
1249 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1252 /* if we are in a service period, do nothing */
1253 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1256 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1257 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1259 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1265 static ieee80211_rx_result debug_noinline
1266 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1268 struct sta_info *sta = rx->sta;
1269 struct sk_buff *skb = rx->skb;
1270 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1271 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1277 * Update last_rx only for IBSS packets which are for the current
1278 * BSSID to avoid keeping the current IBSS network alive in cases
1279 * where other STAs start using different BSSID.
1281 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1282 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1283 NL80211_IFTYPE_ADHOC);
1284 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
1285 sta->last_rx = jiffies;
1286 if (ieee80211_is_data(hdr->frame_control)) {
1287 sta->last_rx_rate_idx = status->rate_idx;
1288 sta->last_rx_rate_flag = status->flag;
1291 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1293 * Mesh beacons will update last_rx when if they are found to
1294 * match the current local configuration when processed.
1296 sta->last_rx = jiffies;
1297 if (ieee80211_is_data(hdr->frame_control)) {
1298 sta->last_rx_rate_idx = status->rate_idx;
1299 sta->last_rx_rate_flag = status->flag;
1303 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1306 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1307 ieee80211_sta_rx_notify(rx->sdata, hdr);
1309 sta->rx_fragments++;
1310 sta->rx_bytes += rx->skb->len;
1311 sta->last_signal = status->signal;
1312 ewma_add(&sta->avg_signal, -status->signal);
1315 * Change STA power saving mode only at the end of a frame
1316 * exchange sequence.
1318 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1319 !ieee80211_has_morefrags(hdr->frame_control) &&
1320 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1321 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1322 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1323 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1325 * Ignore doze->wake transitions that are
1326 * indicated by non-data frames, the standard
1327 * is unclear here, but for example going to
1328 * PS mode and then scanning would cause a
1329 * doze->wake transition for the probe request,
1330 * and that is clearly undesirable.
1332 if (ieee80211_is_data(hdr->frame_control) &&
1333 !ieee80211_has_pm(hdr->frame_control))
1336 if (ieee80211_has_pm(hdr->frame_control))
1337 ap_sta_ps_start(sta);
1342 * Drop (qos-)data::nullfunc frames silently, since they
1343 * are used only to control station power saving mode.
1345 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1346 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1347 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1350 * If we receive a 4-addr nullfunc frame from a STA
1351 * that was not moved to a 4-addr STA vlan yet send
1352 * the event to userspace and for older hostapd drop
1353 * the frame to the monitor interface.
1355 if (ieee80211_has_a4(hdr->frame_control) &&
1356 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1357 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1358 !rx->sdata->u.vlan.sta))) {
1359 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1360 cfg80211_rx_unexpected_4addr_frame(
1361 rx->sdata->dev, sta->sta.addr,
1363 return RX_DROP_MONITOR;
1366 * Update counter and free packet here to avoid
1367 * counting this as a dropped packed.
1370 dev_kfree_skb(rx->skb);
1375 } /* ieee80211_rx_h_sta_process */
1377 static inline struct ieee80211_fragment_entry *
1378 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1379 unsigned int frag, unsigned int seq, int rx_queue,
1380 struct sk_buff **skb)
1382 struct ieee80211_fragment_entry *entry;
1385 idx = sdata->fragment_next;
1386 entry = &sdata->fragments[sdata->fragment_next++];
1387 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1388 sdata->fragment_next = 0;
1390 if (!skb_queue_empty(&entry->skb_list)) {
1391 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1392 struct ieee80211_hdr *hdr =
1393 (struct ieee80211_hdr *) entry->skb_list.next->data;
1394 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1395 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1396 "addr1=%pM addr2=%pM\n",
1398 jiffies - entry->first_frag_time, entry->seq,
1399 entry->last_frag, hdr->addr1, hdr->addr2);
1401 __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 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1446 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
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;
1472 sc = le16_to_cpu(hdr->seq_ctrl);
1473 frag = sc & IEEE80211_SCTL_FRAG;
1475 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1476 (rx->skb)->len < 24 ||
1477 is_multicast_ether_addr(hdr->addr1))) {
1478 /* not fragmented */
1481 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1483 if (skb_linearize(rx->skb))
1484 return RX_DROP_UNUSABLE;
1487 * skb_linearize() might change the skb->data and
1488 * previously cached variables (in this case, hdr) need to
1489 * be refreshed with the new data.
1491 hdr = (struct ieee80211_hdr *)rx->skb->data;
1492 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1495 /* This is the first fragment of a new frame. */
1496 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1497 rx->seqno_idx, &(rx->skb));
1498 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1499 ieee80211_has_protected(fc)) {
1500 int queue = rx->security_idx;
1501 /* Store CCMP PN so that we can verify that the next
1502 * fragment has a sequential PN value. */
1504 memcpy(entry->last_pn,
1505 rx->key->u.ccmp.rx_pn[queue],
1511 /* This is a fragment for a frame that should already be pending in
1512 * fragment cache. Add this fragment to the end of the pending entry.
1514 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1515 rx->seqno_idx, hdr);
1517 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1518 return RX_DROP_MONITOR;
1521 /* Verify that MPDUs within one MSDU have sequential PN values.
1522 * (IEEE 802.11i, 8.3.3.4.5) */
1525 u8 pn[CCMP_PN_LEN], *rpn;
1527 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1528 return RX_DROP_UNUSABLE;
1529 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1530 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1535 queue = rx->security_idx;
1536 rpn = rx->key->u.ccmp.rx_pn[queue];
1537 if (memcmp(pn, rpn, CCMP_PN_LEN))
1538 return RX_DROP_UNUSABLE;
1539 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1542 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1543 __skb_queue_tail(&entry->skb_list, rx->skb);
1544 entry->last_frag = frag;
1545 entry->extra_len += rx->skb->len;
1546 if (ieee80211_has_morefrags(fc)) {
1551 rx->skb = __skb_dequeue(&entry->skb_list);
1552 if (skb_tailroom(rx->skb) < entry->extra_len) {
1553 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1554 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1556 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1557 __skb_queue_purge(&entry->skb_list);
1558 return RX_DROP_UNUSABLE;
1561 while ((skb = __skb_dequeue(&entry->skb_list))) {
1562 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1566 /* Complete frame has been reassembled - process it now */
1567 status = IEEE80211_SKB_RXCB(rx->skb);
1568 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1572 rx->sta->rx_packets++;
1573 if (is_multicast_ether_addr(hdr->addr1))
1574 rx->local->dot11MulticastReceivedFrameCount++;
1576 ieee80211_led_rx(rx->local);
1581 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1583 if (unlikely(!rx->sta ||
1584 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1591 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1593 struct sk_buff *skb = rx->skb;
1594 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1597 * Pass through unencrypted frames if the hardware has
1598 * decrypted them already.
1600 if (status->flag & RX_FLAG_DECRYPTED)
1603 /* Drop unencrypted frames if key is set. */
1604 if (unlikely(!ieee80211_has_protected(fc) &&
1605 !ieee80211_is_nullfunc(fc) &&
1606 ieee80211_is_data(fc) &&
1607 (rx->key || rx->sdata->drop_unencrypted)))
1614 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1616 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1617 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1618 __le16 fc = hdr->frame_control;
1621 * Pass through unencrypted frames if the hardware has
1622 * decrypted them already.
1624 if (status->flag & RX_FLAG_DECRYPTED)
1627 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1628 if (unlikely(!ieee80211_has_protected(fc) &&
1629 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1631 if (ieee80211_is_deauth(fc))
1632 cfg80211_send_unprot_deauth(rx->sdata->dev,
1635 else if (ieee80211_is_disassoc(fc))
1636 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1641 /* BIP does not use Protected field, so need to check MMIE */
1642 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1643 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1644 if (ieee80211_is_deauth(fc))
1645 cfg80211_send_unprot_deauth(rx->sdata->dev,
1648 else if (ieee80211_is_disassoc(fc))
1649 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1655 * When using MFP, Action frames are not allowed prior to
1656 * having configured keys.
1658 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1659 ieee80211_is_robust_mgmt_frame(
1660 (struct ieee80211_hdr *) rx->skb->data)))
1668 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1670 struct ieee80211_sub_if_data *sdata = rx->sdata;
1671 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1672 bool check_port_control = false;
1673 struct ethhdr *ehdr;
1676 *port_control = false;
1677 if (ieee80211_has_a4(hdr->frame_control) &&
1678 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1681 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1682 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1684 if (!sdata->u.mgd.use_4addr)
1687 check_port_control = true;
1690 if (is_multicast_ether_addr(hdr->addr1) &&
1691 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1694 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1698 ehdr = (struct ethhdr *) rx->skb->data;
1699 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1700 *port_control = true;
1701 else if (check_port_control)
1708 * requires that rx->skb is a frame with ethernet header
1710 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1712 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1713 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1714 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1717 * Allow EAPOL frames to us/the PAE group address regardless
1718 * of whether the frame was encrypted or not.
1720 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1721 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1722 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1725 if (ieee80211_802_1x_port_control(rx) ||
1726 ieee80211_drop_unencrypted(rx, fc))
1733 * requires that rx->skb is a frame with ethernet header
1736 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1738 struct ieee80211_sub_if_data *sdata = rx->sdata;
1739 struct net_device *dev = sdata->dev;
1740 struct sk_buff *skb, *xmit_skb;
1741 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1742 struct sta_info *dsta;
1743 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1748 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1749 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1750 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1751 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1752 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1753 if (is_multicast_ether_addr(ehdr->h_dest)) {
1755 * send multicast frames both to higher layers in
1756 * local net stack and back to the wireless medium
1758 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1759 if (!xmit_skb && net_ratelimit())
1760 printk(KERN_DEBUG "%s: failed to clone "
1761 "multicast frame\n", dev->name);
1763 dsta = sta_info_get(sdata, skb->data);
1766 * The destination station is associated to
1767 * this AP (in this VLAN), so send the frame
1768 * directly to it and do not pass it to local
1778 int align __maybe_unused;
1780 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1782 * 'align' will only take the values 0 or 2 here
1783 * since all frames are required to be aligned
1784 * to 2-byte boundaries when being passed to
1785 * mac80211. That also explains the __skb_push()
1788 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1790 if (WARN_ON(skb_headroom(skb) < 3)) {
1794 u8 *data = skb->data;
1795 size_t len = skb_headlen(skb);
1797 memmove(skb->data, data, len);
1798 skb_set_tail_pointer(skb, len);
1804 /* deliver to local stack */
1805 skb->protocol = eth_type_trans(skb, dev);
1806 memset(skb->cb, 0, sizeof(skb->cb));
1807 netif_receive_skb(skb);
1813 * Send to wireless media and increase priority by 256 to
1814 * keep the received priority instead of reclassifying
1815 * the frame (see cfg80211_classify8021d).
1817 xmit_skb->priority += 256;
1818 xmit_skb->protocol = htons(ETH_P_802_3);
1819 skb_reset_network_header(xmit_skb);
1820 skb_reset_mac_header(xmit_skb);
1821 dev_queue_xmit(xmit_skb);
1825 static ieee80211_rx_result debug_noinline
1826 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1828 struct net_device *dev = rx->sdata->dev;
1829 struct sk_buff *skb = rx->skb;
1830 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1831 __le16 fc = hdr->frame_control;
1832 struct sk_buff_head frame_list;
1833 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1835 if (unlikely(!ieee80211_is_data(fc)))
1838 if (unlikely(!ieee80211_is_data_present(fc)))
1839 return RX_DROP_MONITOR;
1841 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1844 if (ieee80211_has_a4(hdr->frame_control) &&
1845 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1846 !rx->sdata->u.vlan.sta)
1847 return RX_DROP_UNUSABLE;
1849 if (is_multicast_ether_addr(hdr->addr1) &&
1850 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1851 rx->sdata->u.vlan.sta) ||
1852 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1853 rx->sdata->u.mgd.use_4addr)))
1854 return RX_DROP_UNUSABLE;
1857 __skb_queue_head_init(&frame_list);
1859 if (skb_linearize(skb))
1860 return RX_DROP_UNUSABLE;
1862 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1863 rx->sdata->vif.type,
1864 rx->local->hw.extra_tx_headroom, true);
1866 while (!skb_queue_empty(&frame_list)) {
1867 rx->skb = __skb_dequeue(&frame_list);
1869 if (!ieee80211_frame_allowed(rx, fc)) {
1870 dev_kfree_skb(rx->skb);
1873 dev->stats.rx_packets++;
1874 dev->stats.rx_bytes += rx->skb->len;
1876 ieee80211_deliver_skb(rx);
1882 #ifdef CONFIG_MAC80211_MESH
1883 static ieee80211_rx_result
1884 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1886 struct ieee80211_hdr *fwd_hdr, *hdr;
1887 struct ieee80211_tx_info *info;
1888 struct ieee80211s_hdr *mesh_hdr;
1889 struct sk_buff *skb = rx->skb, *fwd_skb;
1890 struct ieee80211_local *local = rx->local;
1891 struct ieee80211_sub_if_data *sdata = rx->sdata;
1892 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1893 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1894 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1897 hdr = (struct ieee80211_hdr *) skb->data;
1898 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1899 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1901 /* frame is in RMC, don't forward */
1902 if (ieee80211_is_data(hdr->frame_control) &&
1903 is_multicast_ether_addr(hdr->addr1) &&
1904 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1905 return RX_DROP_MONITOR;
1907 if (!ieee80211_is_data(hdr->frame_control))
1911 return RX_DROP_MONITOR;
1913 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1914 struct mesh_path *mppath;
1918 if (is_multicast_ether_addr(hdr->addr1)) {
1919 mpp_addr = hdr->addr3;
1920 proxied_addr = mesh_hdr->eaddr1;
1922 mpp_addr = hdr->addr4;
1923 proxied_addr = mesh_hdr->eaddr2;
1927 mppath = mpp_path_lookup(proxied_addr, sdata);
1929 mpp_path_add(proxied_addr, mpp_addr, sdata);
1931 spin_lock_bh(&mppath->state_lock);
1932 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1933 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1934 spin_unlock_bh(&mppath->state_lock);
1939 /* Frame has reached destination. Don't forward */
1940 if (!is_multicast_ether_addr(hdr->addr1) &&
1941 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1944 q = ieee80211_select_queue_80211(local, skb, hdr);
1945 if (ieee80211_queue_stopped(&local->hw, q)) {
1946 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
1947 return RX_DROP_MONITOR;
1949 skb_set_queue_mapping(skb, q);
1951 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1954 if (!--mesh_hdr->ttl) {
1955 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1956 return RX_DROP_MONITOR;
1959 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1961 if (net_ratelimit())
1962 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1967 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1968 info = IEEE80211_SKB_CB(fwd_skb);
1969 memset(info, 0, sizeof(*info));
1970 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1971 info->control.vif = &rx->sdata->vif;
1972 info->control.jiffies = jiffies;
1973 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1974 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1975 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1976 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1977 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1979 /* unable to resolve next hop */
1980 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1981 0, reason, fwd_hdr->addr2, sdata);
1982 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
1984 return RX_DROP_MONITOR;
1987 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1988 ieee80211_add_pending_skb(local, fwd_skb);
1990 if (is_multicast_ether_addr(hdr->addr1) ||
1991 sdata->dev->flags & IFF_PROMISC)
1994 return RX_DROP_MONITOR;
1998 static ieee80211_rx_result debug_noinline
1999 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2001 struct ieee80211_sub_if_data *sdata = rx->sdata;
2002 struct ieee80211_local *local = rx->local;
2003 struct net_device *dev = sdata->dev;
2004 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2005 __le16 fc = hdr->frame_control;
2009 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2012 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2013 return RX_DROP_MONITOR;
2016 * Send unexpected-4addr-frame event to hostapd. For older versions,
2017 * also drop the frame to cooked monitor interfaces.
2019 if (ieee80211_has_a4(hdr->frame_control) &&
2020 sdata->vif.type == NL80211_IFTYPE_AP) {
2022 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2023 cfg80211_rx_unexpected_4addr_frame(
2024 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2025 return RX_DROP_MONITOR;
2028 err = __ieee80211_data_to_8023(rx, &port_control);
2030 return RX_DROP_UNUSABLE;
2032 if (!ieee80211_frame_allowed(rx, fc))
2033 return RX_DROP_MONITOR;
2035 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2036 unlikely(port_control) && sdata->bss) {
2037 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2045 dev->stats.rx_packets++;
2046 dev->stats.rx_bytes += rx->skb->len;
2048 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2049 !is_multicast_ether_addr(
2050 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2051 (!local->scanning &&
2052 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2053 mod_timer(&local->dynamic_ps_timer, jiffies +
2054 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2057 ieee80211_deliver_skb(rx);
2062 static ieee80211_rx_result debug_noinline
2063 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2065 struct ieee80211_local *local = rx->local;
2066 struct ieee80211_hw *hw = &local->hw;
2067 struct sk_buff *skb = rx->skb;
2068 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2069 struct tid_ampdu_rx *tid_agg_rx;
2073 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2076 if (ieee80211_is_back_req(bar->frame_control)) {
2078 __le16 control, start_seq_num;
2079 } __packed bar_data;
2082 return RX_DROP_MONITOR;
2084 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2085 &bar_data, sizeof(bar_data)))
2086 return RX_DROP_MONITOR;
2088 tid = le16_to_cpu(bar_data.control) >> 12;
2090 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2092 return RX_DROP_MONITOR;
2094 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2096 /* reset session timer */
2097 if (tid_agg_rx->timeout)
2098 mod_timer(&tid_agg_rx->session_timer,
2099 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2101 spin_lock(&tid_agg_rx->reorder_lock);
2102 /* release stored frames up to start of BAR */
2103 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2104 spin_unlock(&tid_agg_rx->reorder_lock);
2111 * After this point, we only want management frames,
2112 * so we can drop all remaining control frames to
2113 * cooked monitor interfaces.
2115 return RX_DROP_MONITOR;
2118 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2119 struct ieee80211_mgmt *mgmt,
2122 struct ieee80211_local *local = sdata->local;
2123 struct sk_buff *skb;
2124 struct ieee80211_mgmt *resp;
2126 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2127 /* Not to own unicast address */
2131 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2132 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2133 /* Not from the current AP or not associated yet. */
2137 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2138 /* Too short SA Query request frame */
2142 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2146 skb_reserve(skb, local->hw.extra_tx_headroom);
2147 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2148 memset(resp, 0, 24);
2149 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2150 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2151 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2152 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2153 IEEE80211_STYPE_ACTION);
2154 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2155 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2156 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2157 memcpy(resp->u.action.u.sa_query.trans_id,
2158 mgmt->u.action.u.sa_query.trans_id,
2159 WLAN_SA_QUERY_TR_ID_LEN);
2161 ieee80211_tx_skb(sdata, skb);
2164 static ieee80211_rx_result debug_noinline
2165 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2167 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2168 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2171 * From here on, look only at management frames.
2172 * Data and control frames are already handled,
2173 * and unknown (reserved) frames are useless.
2175 if (rx->skb->len < 24)
2176 return RX_DROP_MONITOR;
2178 if (!ieee80211_is_mgmt(mgmt->frame_control))
2179 return RX_DROP_MONITOR;
2181 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2182 ieee80211_is_beacon(mgmt->frame_control) &&
2183 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2184 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2185 rx->skb->data, rx->skb->len,
2186 status->freq, GFP_ATOMIC);
2187 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2190 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2191 return RX_DROP_MONITOR;
2193 if (ieee80211_drop_unencrypted_mgmt(rx))
2194 return RX_DROP_UNUSABLE;
2199 static ieee80211_rx_result debug_noinline
2200 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2202 struct ieee80211_local *local = rx->local;
2203 struct ieee80211_sub_if_data *sdata = rx->sdata;
2204 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2205 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2206 int len = rx->skb->len;
2208 if (!ieee80211_is_action(mgmt->frame_control))
2211 /* drop too small frames */
2212 if (len < IEEE80211_MIN_ACTION_SIZE)
2213 return RX_DROP_UNUSABLE;
2215 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2216 return RX_DROP_UNUSABLE;
2218 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2219 return RX_DROP_UNUSABLE;
2221 switch (mgmt->u.action.category) {
2222 case WLAN_CATEGORY_HT:
2223 /* reject HT action frames from stations not supporting HT */
2224 if (!rx->sta->sta.ht_cap.ht_supported)
2227 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2228 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2229 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2230 sdata->vif.type != NL80211_IFTYPE_AP &&
2231 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2234 /* verify action & smps_control are present */
2235 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2238 switch (mgmt->u.action.u.ht_smps.action) {
2239 case WLAN_HT_ACTION_SMPS: {
2240 struct ieee80211_supported_band *sband;
2243 /* convert to HT capability */
2244 switch (mgmt->u.action.u.ht_smps.smps_control) {
2245 case WLAN_HT_SMPS_CONTROL_DISABLED:
2246 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2248 case WLAN_HT_SMPS_CONTROL_STATIC:
2249 smps = WLAN_HT_CAP_SM_PS_STATIC;
2251 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2252 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2257 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2259 /* if no change do nothing */
2260 if ((rx->sta->sta.ht_cap.cap &
2261 IEEE80211_HT_CAP_SM_PS) == smps)
2264 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2265 rx->sta->sta.ht_cap.cap |= smps;
2267 sband = rx->local->hw.wiphy->bands[status->band];
2269 rate_control_rate_update(local, sband, rx->sta,
2270 IEEE80211_RC_SMPS_CHANGED,
2271 local->_oper_channel_type);
2279 case WLAN_CATEGORY_BACK:
2280 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2281 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2282 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2283 sdata->vif.type != NL80211_IFTYPE_AP &&
2284 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2287 /* verify action_code is present */
2288 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2291 switch (mgmt->u.action.u.addba_req.action_code) {
2292 case WLAN_ACTION_ADDBA_REQ:
2293 if (len < (IEEE80211_MIN_ACTION_SIZE +
2294 sizeof(mgmt->u.action.u.addba_req)))
2297 case WLAN_ACTION_ADDBA_RESP:
2298 if (len < (IEEE80211_MIN_ACTION_SIZE +
2299 sizeof(mgmt->u.action.u.addba_resp)))
2302 case WLAN_ACTION_DELBA:
2303 if (len < (IEEE80211_MIN_ACTION_SIZE +
2304 sizeof(mgmt->u.action.u.delba)))
2312 case WLAN_CATEGORY_SPECTRUM_MGMT:
2313 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2316 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2319 /* verify action_code is present */
2320 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2323 switch (mgmt->u.action.u.measurement.action_code) {
2324 case WLAN_ACTION_SPCT_MSR_REQ:
2325 if (len < (IEEE80211_MIN_ACTION_SIZE +
2326 sizeof(mgmt->u.action.u.measurement)))
2328 ieee80211_process_measurement_req(sdata, mgmt, len);
2330 case WLAN_ACTION_SPCT_CHL_SWITCH:
2331 if (len < (IEEE80211_MIN_ACTION_SIZE +
2332 sizeof(mgmt->u.action.u.chan_switch)))
2335 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2338 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2344 case WLAN_CATEGORY_SA_QUERY:
2345 if (len < (IEEE80211_MIN_ACTION_SIZE +
2346 sizeof(mgmt->u.action.u.sa_query)))
2349 switch (mgmt->u.action.u.sa_query.action) {
2350 case WLAN_ACTION_SA_QUERY_REQUEST:
2351 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2353 ieee80211_process_sa_query_req(sdata, mgmt, len);
2357 case WLAN_CATEGORY_SELF_PROTECTED:
2358 switch (mgmt->u.action.u.self_prot.action_code) {
2359 case WLAN_SP_MESH_PEERING_OPEN:
2360 case WLAN_SP_MESH_PEERING_CLOSE:
2361 case WLAN_SP_MESH_PEERING_CONFIRM:
2362 if (!ieee80211_vif_is_mesh(&sdata->vif))
2364 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2365 /* userspace handles this frame */
2368 case WLAN_SP_MGK_INFORM:
2369 case WLAN_SP_MGK_ACK:
2370 if (!ieee80211_vif_is_mesh(&sdata->vif))
2375 case WLAN_CATEGORY_MESH_ACTION:
2376 if (!ieee80211_vif_is_mesh(&sdata->vif))
2378 if (mesh_action_is_path_sel(mgmt) &&
2379 (!mesh_path_sel_is_hwmp(sdata)))
2387 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2388 /* will return in the next handlers */
2393 rx->sta->rx_packets++;
2394 dev_kfree_skb(rx->skb);
2398 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2399 skb_queue_tail(&sdata->skb_queue, rx->skb);
2400 ieee80211_queue_work(&local->hw, &sdata->work);
2402 rx->sta->rx_packets++;
2406 static ieee80211_rx_result debug_noinline
2407 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2409 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2411 /* skip known-bad action frames and return them in the next handler */
2412 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2416 * Getting here means the kernel doesn't know how to handle
2417 * it, but maybe userspace does ... include returned frames
2418 * so userspace can register for those to know whether ones
2419 * it transmitted were processed or returned.
2422 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2423 rx->skb->data, rx->skb->len,
2426 rx->sta->rx_packets++;
2427 dev_kfree_skb(rx->skb);
2435 static ieee80211_rx_result debug_noinline
2436 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2438 struct ieee80211_local *local = rx->local;
2439 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2440 struct sk_buff *nskb;
2441 struct ieee80211_sub_if_data *sdata = rx->sdata;
2442 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2444 if (!ieee80211_is_action(mgmt->frame_control))
2448 * For AP mode, hostapd is responsible for handling any action
2449 * frames that we didn't handle, including returning unknown
2450 * ones. For all other modes we will return them to the sender,
2451 * setting the 0x80 bit in the action category, as required by
2452 * 802.11-2007 7.3.1.11.
2453 * Newer versions of hostapd shall also use the management frame
2454 * registration mechanisms, but older ones still use cooked
2455 * monitor interfaces so push all frames there.
2457 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2458 (sdata->vif.type == NL80211_IFTYPE_AP ||
2459 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2460 return RX_DROP_MONITOR;
2462 /* do not return rejected action frames */
2463 if (mgmt->u.action.category & 0x80)
2464 return RX_DROP_UNUSABLE;
2466 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2469 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2471 nmgmt->u.action.category |= 0x80;
2472 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2473 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2475 memset(nskb->cb, 0, sizeof(nskb->cb));
2477 ieee80211_tx_skb(rx->sdata, nskb);
2479 dev_kfree_skb(rx->skb);
2483 static ieee80211_rx_result debug_noinline
2484 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2486 struct ieee80211_sub_if_data *sdata = rx->sdata;
2487 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2490 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2492 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2493 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2494 sdata->vif.type != NL80211_IFTYPE_STATION)
2495 return RX_DROP_MONITOR;
2498 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2499 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2500 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2501 /* process for all: mesh, mlme, ibss */
2503 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2504 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2505 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2506 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2507 if (is_multicast_ether_addr(mgmt->da) &&
2508 !is_broadcast_ether_addr(mgmt->da))
2509 return RX_DROP_MONITOR;
2511 /* process only for station */
2512 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2513 return RX_DROP_MONITOR;
2515 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2516 /* process only for ibss */
2517 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2518 return RX_DROP_MONITOR;
2521 return RX_DROP_MONITOR;
2524 /* queue up frame and kick off work to process it */
2525 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2526 skb_queue_tail(&sdata->skb_queue, rx->skb);
2527 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2529 rx->sta->rx_packets++;
2534 /* TODO: use IEEE80211_RX_FRAGMENTED */
2535 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2536 struct ieee80211_rate *rate)
2538 struct ieee80211_sub_if_data *sdata;
2539 struct ieee80211_local *local = rx->local;
2540 struct ieee80211_rtap_hdr {
2541 struct ieee80211_radiotap_header hdr;
2547 struct sk_buff *skb = rx->skb, *skb2;
2548 struct net_device *prev_dev = NULL;
2549 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2552 * If cooked monitor has been processed already, then
2553 * don't do it again. If not, set the flag.
2555 if (rx->flags & IEEE80211_RX_CMNTR)
2557 rx->flags |= IEEE80211_RX_CMNTR;
2559 /* If there are no cooked monitor interfaces, just free the SKB */
2560 if (!local->cooked_mntrs)
2563 if (skb_headroom(skb) < sizeof(*rthdr) &&
2564 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2567 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2568 memset(rthdr, 0, sizeof(*rthdr));
2569 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2570 rthdr->hdr.it_present =
2571 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2572 (1 << IEEE80211_RADIOTAP_CHANNEL));
2575 rthdr->rate_or_pad = rate->bitrate / 5;
2576 rthdr->hdr.it_present |=
2577 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2579 rthdr->chan_freq = cpu_to_le16(status->freq);
2581 if (status->band == IEEE80211_BAND_5GHZ)
2582 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2583 IEEE80211_CHAN_5GHZ);
2585 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2586 IEEE80211_CHAN_2GHZ);
2588 skb_set_mac_header(skb, 0);
2589 skb->ip_summed = CHECKSUM_UNNECESSARY;
2590 skb->pkt_type = PACKET_OTHERHOST;
2591 skb->protocol = htons(ETH_P_802_2);
2593 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2594 if (!ieee80211_sdata_running(sdata))
2597 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2598 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2602 skb2 = skb_clone(skb, GFP_ATOMIC);
2604 skb2->dev = prev_dev;
2605 netif_receive_skb(skb2);
2609 prev_dev = sdata->dev;
2610 sdata->dev->stats.rx_packets++;
2611 sdata->dev->stats.rx_bytes += skb->len;
2615 skb->dev = prev_dev;
2616 netif_receive_skb(skb);
2624 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2625 ieee80211_rx_result res)
2628 case RX_DROP_MONITOR:
2629 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2631 rx->sta->rx_dropped++;
2634 struct ieee80211_rate *rate = NULL;
2635 struct ieee80211_supported_band *sband;
2636 struct ieee80211_rx_status *status;
2638 status = IEEE80211_SKB_RXCB((rx->skb));
2640 sband = rx->local->hw.wiphy->bands[status->band];
2641 if (!(status->flag & RX_FLAG_HT))
2642 rate = &sband->bitrates[status->rate_idx];
2644 ieee80211_rx_cooked_monitor(rx, rate);
2647 case RX_DROP_UNUSABLE:
2648 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2650 rx->sta->rx_dropped++;
2651 dev_kfree_skb(rx->skb);
2654 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2659 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2661 ieee80211_rx_result res = RX_DROP_MONITOR;
2662 struct sk_buff *skb;
2664 #define CALL_RXH(rxh) \
2667 if (res != RX_CONTINUE) \
2671 spin_lock(&rx->local->rx_skb_queue.lock);
2672 if (rx->local->running_rx_handler)
2675 rx->local->running_rx_handler = true;
2677 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2678 spin_unlock(&rx->local->rx_skb_queue.lock);
2681 * all the other fields are valid across frames
2682 * that belong to an aMPDU since they are on the
2683 * same TID from the same station
2687 CALL_RXH(ieee80211_rx_h_decrypt)
2688 CALL_RXH(ieee80211_rx_h_check_more_data)
2689 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2690 CALL_RXH(ieee80211_rx_h_sta_process)
2691 CALL_RXH(ieee80211_rx_h_defragment)
2692 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2693 /* must be after MMIC verify so header is counted in MPDU mic */
2694 #ifdef CONFIG_MAC80211_MESH
2695 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2696 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2698 CALL_RXH(ieee80211_rx_h_amsdu)
2699 CALL_RXH(ieee80211_rx_h_data)
2700 CALL_RXH(ieee80211_rx_h_ctrl);
2701 CALL_RXH(ieee80211_rx_h_mgmt_check)
2702 CALL_RXH(ieee80211_rx_h_action)
2703 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2704 CALL_RXH(ieee80211_rx_h_action_return)
2705 CALL_RXH(ieee80211_rx_h_mgmt)
2708 ieee80211_rx_handlers_result(rx, res);
2709 spin_lock(&rx->local->rx_skb_queue.lock);
2713 rx->local->running_rx_handler = false;
2716 spin_unlock(&rx->local->rx_skb_queue.lock);
2719 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2721 ieee80211_rx_result res = RX_DROP_MONITOR;
2723 #define CALL_RXH(rxh) \
2726 if (res != RX_CONTINUE) \
2730 CALL_RXH(ieee80211_rx_h_passive_scan)
2731 CALL_RXH(ieee80211_rx_h_check)
2733 ieee80211_rx_reorder_ampdu(rx);
2735 ieee80211_rx_handlers(rx);
2739 ieee80211_rx_handlers_result(rx, res);
2745 * This function makes calls into the RX path, therefore
2746 * it has to be invoked under RCU read lock.
2748 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2750 struct ieee80211_rx_data rx = {
2752 .sdata = sta->sdata,
2753 .local = sta->local,
2754 /* This is OK -- must be QoS data frame */
2755 .security_idx = tid,
2759 struct tid_ampdu_rx *tid_agg_rx;
2761 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2765 spin_lock(&tid_agg_rx->reorder_lock);
2766 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2767 spin_unlock(&tid_agg_rx->reorder_lock);
2769 ieee80211_rx_handlers(&rx);
2772 /* main receive path */
2774 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2775 struct ieee80211_hdr *hdr)
2777 struct ieee80211_sub_if_data *sdata = rx->sdata;
2778 struct sk_buff *skb = rx->skb;
2779 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2780 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2781 int multicast = is_multicast_ether_addr(hdr->addr1);
2783 switch (sdata->vif.type) {
2784 case NL80211_IFTYPE_STATION:
2785 if (!bssid && !sdata->u.mgd.use_4addr)
2788 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2789 if (!(sdata->dev->flags & IFF_PROMISC) ||
2790 sdata->u.mgd.use_4addr)
2792 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2795 case NL80211_IFTYPE_ADHOC:
2798 if (ieee80211_is_beacon(hdr->frame_control)) {
2801 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2802 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2804 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2805 } else if (!multicast &&
2806 compare_ether_addr(sdata->vif.addr,
2808 if (!(sdata->dev->flags & IFF_PROMISC))
2810 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2811 } else if (!rx->sta) {
2813 if (status->flag & RX_FLAG_HT)
2814 rate_idx = 0; /* TODO: HT rates */
2816 rate_idx = status->rate_idx;
2817 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2821 case NL80211_IFTYPE_MESH_POINT:
2823 compare_ether_addr(sdata->vif.addr,
2825 if (!(sdata->dev->flags & IFF_PROMISC))
2828 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2831 case NL80211_IFTYPE_AP_VLAN:
2832 case NL80211_IFTYPE_AP:
2834 if (compare_ether_addr(sdata->vif.addr,
2837 } else if (!ieee80211_bssid_match(bssid,
2840 * Accept public action frames even when the
2841 * BSSID doesn't match, this is used for P2P
2842 * and location updates. Note that mac80211
2843 * itself never looks at these frames.
2845 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2846 ieee80211_is_public_action(hdr, skb->len))
2848 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2849 !ieee80211_is_beacon(hdr->frame_control))
2851 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2854 case NL80211_IFTYPE_WDS:
2855 if (bssid || !ieee80211_is_data(hdr->frame_control))
2857 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2861 /* should never get here */
2870 * This function returns whether or not the SKB
2871 * was destined for RX processing or not, which,
2872 * if consume is true, is equivalent to whether
2873 * or not the skb was consumed.
2875 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2876 struct sk_buff *skb, bool consume)
2878 struct ieee80211_local *local = rx->local;
2879 struct ieee80211_sub_if_data *sdata = rx->sdata;
2880 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2881 struct ieee80211_hdr *hdr = (void *)skb->data;
2885 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2886 prepares = prepare_for_handlers(rx, hdr);
2892 skb = skb_copy(skb, GFP_ATOMIC);
2894 if (net_ratelimit())
2895 wiphy_debug(local->hw.wiphy,
2896 "failed to copy skb for %s\n",
2904 ieee80211_invoke_rx_handlers(rx);
2909 * This is the actual Rx frames handler. as it blongs to Rx path it must
2910 * be called with rcu_read_lock protection.
2912 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2913 struct sk_buff *skb)
2915 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2916 struct ieee80211_local *local = hw_to_local(hw);
2917 struct ieee80211_sub_if_data *sdata;
2918 struct ieee80211_hdr *hdr;
2920 struct ieee80211_rx_data rx;
2921 struct ieee80211_sub_if_data *prev;
2922 struct sta_info *sta, *tmp, *prev_sta;
2925 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2926 memset(&rx, 0, sizeof(rx));
2930 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2931 local->dot11ReceivedFragmentCount++;
2933 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2934 test_bit(SCAN_SW_SCANNING, &local->scanning)))
2935 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2937 if (ieee80211_is_mgmt(fc))
2938 err = skb_linearize(skb);
2940 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2947 hdr = (struct ieee80211_hdr *)skb->data;
2948 ieee80211_parse_qos(&rx);
2949 ieee80211_verify_alignment(&rx);
2951 if (ieee80211_is_data(fc)) {
2954 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2961 rx.sdata = prev_sta->sdata;
2962 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2969 rx.sdata = prev_sta->sdata;
2971 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2979 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2980 if (!ieee80211_sdata_running(sdata))
2983 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2984 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2988 * frame is destined for this interface, but if it's
2989 * not also for the previous one we handle that after
2990 * the loop to avoid copying the SKB once too much
2998 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3000 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3006 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3009 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3018 * This is the receive path handler. It is called by a low level driver when an
3019 * 802.11 MPDU is received from the hardware.
3021 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3023 struct ieee80211_local *local = hw_to_local(hw);
3024 struct ieee80211_rate *rate = NULL;
3025 struct ieee80211_supported_band *sband;
3026 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3028 WARN_ON_ONCE(softirq_count() == 0);
3030 if (WARN_ON(status->band < 0 ||
3031 status->band >= IEEE80211_NUM_BANDS))
3034 sband = local->hw.wiphy->bands[status->band];
3035 if (WARN_ON(!sband))
3039 * If we're suspending, it is possible although not too likely
3040 * that we'd be receiving frames after having already partially
3041 * quiesced the stack. We can't process such frames then since
3042 * that might, for example, cause stations to be added or other
3043 * driver callbacks be invoked.
3045 if (unlikely(local->quiescing || local->suspended))
3049 * The same happens when we're not even started,
3050 * but that's worth a warning.
3052 if (WARN_ON(!local->started))
3055 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3057 * Validate the rate, unless a PLCP error means that
3058 * we probably can't have a valid rate here anyway.
3061 if (status->flag & RX_FLAG_HT) {
3063 * rate_idx is MCS index, which can be [0-76]
3066 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3068 * Anything else would be some sort of driver or
3069 * hardware error. The driver should catch hardware
3072 if (WARN((status->rate_idx < 0 ||
3073 status->rate_idx > 76),
3074 "Rate marked as an HT rate but passed "
3075 "status->rate_idx is not "
3076 "an MCS index [0-76]: %d (0x%02x)\n",
3081 if (WARN_ON(status->rate_idx < 0 ||
3082 status->rate_idx >= sband->n_bitrates))
3084 rate = &sband->bitrates[status->rate_idx];
3088 status->rx_flags = 0;
3091 * key references and virtual interfaces are protected using RCU
3092 * and this requires that we are in a read-side RCU section during
3093 * receive processing
3098 * Frames with failed FCS/PLCP checksum are not returned,
3099 * all other frames are returned without radiotap header
3100 * if it was previously present.
3101 * Also, frames with less than 16 bytes are dropped.
3103 skb = ieee80211_rx_monitor(local, skb, rate);
3109 ieee80211_tpt_led_trig_rx(local,
3110 ((struct ieee80211_hdr *)skb->data)->frame_control,
3112 __ieee80211_rx_handle_packet(hw, skb);
3120 EXPORT_SYMBOL(ieee80211_rx);
3122 /* This is a version of the rx handler that can be called from hard irq
3123 * context. Post the skb on the queue and schedule the tasklet */
3124 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3126 struct ieee80211_local *local = hw_to_local(hw);
3128 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3130 skb->pkt_type = IEEE80211_RX_MSG;
3131 skb_queue_tail(&local->skb_queue, skb);
3132 tasklet_schedule(&local->tasklet);
3134 EXPORT_SYMBOL(ieee80211_rx_irqsafe);