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)))) {
862 if (rx->sta && rx->sta->dummy &&
863 ieee80211_is_data_present(hdr->frame_control)) {
867 payload = rx->skb->data +
868 ieee80211_hdrlen(hdr->frame_control);
869 ethertype = (payload[6] << 8) | payload[7];
870 if (cpu_to_be16(ethertype) ==
871 rx->sdata->control_port_protocol)
875 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
876 cfg80211_rx_spurious_frame(rx->sdata->dev,
879 return RX_DROP_UNUSABLE;
881 return RX_DROP_MONITOR;
888 static ieee80211_rx_result debug_noinline
889 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
891 struct sk_buff *skb = rx->skb;
892 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
893 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
896 ieee80211_rx_result result = RX_DROP_UNUSABLE;
897 struct ieee80211_key *sta_ptk = NULL;
898 int mmie_keyidx = -1;
904 * There are four types of keys:
906 * - IGTK (group keys for management frames)
907 * - PTK (pairwise keys)
908 * - STK (station-to-station pairwise keys)
910 * When selecting a key, we have to distinguish between multicast
911 * (including broadcast) and unicast frames, the latter can only
912 * use PTKs and STKs while the former always use GTKs and IGTKs.
913 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
914 * unicast frames can also use key indices like GTKs. Hence, if we
915 * don't have a PTK/STK we check the key index for a WEP key.
917 * Note that in a regular BSS, multicast frames are sent by the
918 * AP only, associated stations unicast the frame to the AP first
919 * which then multicasts it on their behalf.
921 * There is also a slight problem in IBSS mode: GTKs are negotiated
922 * with each station, that is something we don't currently handle.
923 * The spec seems to expect that one negotiates the same key with
924 * every station but there's no such requirement; VLANs could be
929 * No point in finding a key and decrypting if the frame is neither
930 * addressed to us nor a multicast frame.
932 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
935 /* start without a key */
939 sta_ptk = rcu_dereference(rx->sta->ptk);
941 fc = hdr->frame_control;
943 if (!ieee80211_has_protected(fc))
944 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
946 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
948 if ((status->flag & RX_FLAG_DECRYPTED) &&
949 (status->flag & RX_FLAG_IV_STRIPPED))
951 /* Skip decryption if the frame is not protected. */
952 if (!ieee80211_has_protected(fc))
954 } else if (mmie_keyidx >= 0) {
955 /* Broadcast/multicast robust management frame / BIP */
956 if ((status->flag & RX_FLAG_DECRYPTED) &&
957 (status->flag & RX_FLAG_IV_STRIPPED))
960 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
961 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
962 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
964 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
966 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
967 } else if (!ieee80211_has_protected(fc)) {
969 * The frame was not protected, so skip decryption. However, we
970 * need to set rx->key if there is a key that could have been
971 * used so that the frame may be dropped if encryption would
972 * have been expected.
974 struct ieee80211_key *key = NULL;
975 struct ieee80211_sub_if_data *sdata = rx->sdata;
978 if (ieee80211_is_mgmt(fc) &&
979 is_multicast_ether_addr(hdr->addr1) &&
980 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
984 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
985 key = rcu_dereference(rx->sta->gtk[i]);
991 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
992 key = rcu_dereference(sdata->keys[i]);
1004 * The device doesn't give us the IV so we won't be
1005 * able to look up the key. That's ok though, we
1006 * don't need to decrypt the frame, we just won't
1007 * be able to keep statistics accurate.
1008 * Except for key threshold notifications, should
1009 * we somehow allow the driver to tell us which key
1010 * the hardware used if this flag is set?
1012 if ((status->flag & RX_FLAG_DECRYPTED) &&
1013 (status->flag & RX_FLAG_IV_STRIPPED))
1016 hdrlen = ieee80211_hdrlen(fc);
1018 if (rx->skb->len < 8 + hdrlen)
1019 return RX_DROP_UNUSABLE; /* TODO: count this? */
1022 * no need to call ieee80211_wep_get_keyidx,
1023 * it verifies a bunch of things we've done already
1025 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1026 keyidx = keyid >> 6;
1028 /* check per-station GTK first, if multicast packet */
1029 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1030 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1032 /* if not found, try default key */
1034 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1037 * RSNA-protected unicast frames should always be
1038 * sent with pairwise or station-to-station keys,
1039 * but for WEP we allow using a key index as well.
1042 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1043 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1044 !is_multicast_ether_addr(hdr->addr1))
1050 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1051 return RX_DROP_MONITOR;
1053 rx->key->tx_rx_count++;
1054 /* TODO: add threshold stuff again */
1056 return RX_DROP_MONITOR;
1059 if (skb_linearize(rx->skb))
1060 return RX_DROP_UNUSABLE;
1061 /* the hdr variable is invalid now! */
1063 switch (rx->key->conf.cipher) {
1064 case WLAN_CIPHER_SUITE_WEP40:
1065 case WLAN_CIPHER_SUITE_WEP104:
1066 /* Check for weak IVs if possible */
1067 if (rx->sta && ieee80211_is_data(fc) &&
1068 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1069 !(status->flag & RX_FLAG_DECRYPTED)) &&
1070 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1071 rx->sta->wep_weak_iv_count++;
1073 result = ieee80211_crypto_wep_decrypt(rx);
1075 case WLAN_CIPHER_SUITE_TKIP:
1076 result = ieee80211_crypto_tkip_decrypt(rx);
1078 case WLAN_CIPHER_SUITE_CCMP:
1079 result = ieee80211_crypto_ccmp_decrypt(rx);
1081 case WLAN_CIPHER_SUITE_AES_CMAC:
1082 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1086 * We can reach here only with HW-only algorithms
1087 * but why didn't it decrypt the frame?!
1089 return RX_DROP_UNUSABLE;
1092 /* either the frame has been decrypted or will be dropped */
1093 status->flag |= RX_FLAG_DECRYPTED;
1098 static ieee80211_rx_result debug_noinline
1099 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1101 struct ieee80211_local *local;
1102 struct ieee80211_hdr *hdr;
1103 struct sk_buff *skb;
1107 hdr = (struct ieee80211_hdr *) skb->data;
1109 if (!local->pspolling)
1112 if (!ieee80211_has_fromds(hdr->frame_control))
1113 /* this is not from AP */
1116 if (!ieee80211_is_data(hdr->frame_control))
1119 if (!ieee80211_has_moredata(hdr->frame_control)) {
1120 /* AP has no more frames buffered for us */
1121 local->pspolling = false;
1125 /* more data bit is set, let's request a new frame from the AP */
1126 ieee80211_send_pspoll(local, rx->sdata);
1131 static void ap_sta_ps_start(struct sta_info *sta)
1133 struct ieee80211_sub_if_data *sdata = sta->sdata;
1134 struct ieee80211_local *local = sdata->local;
1136 atomic_inc(&sdata->bss->num_sta_ps);
1137 set_sta_flag(sta, WLAN_STA_PS_STA);
1138 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1139 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1140 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1141 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1142 sdata->name, sta->sta.addr, sta->sta.aid);
1143 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1146 static void ap_sta_ps_end(struct sta_info *sta)
1148 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1149 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1150 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1151 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1153 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1154 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1155 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1156 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1157 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1161 ieee80211_sta_ps_deliver_wakeup(sta);
1164 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1166 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1169 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1171 /* Don't let the same PS state be set twice */
1172 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1173 if ((start && in_ps) || (!start && !in_ps))
1177 ap_sta_ps_start(sta_inf);
1179 ap_sta_ps_end(sta_inf);
1183 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1185 static ieee80211_rx_result debug_noinline
1186 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1188 struct ieee80211_sub_if_data *sdata = rx->sdata;
1189 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1190 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1193 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1196 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1197 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1201 * The device handles station powersave, so don't do anything about
1202 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1203 * it to mac80211 since they're handled.)
1205 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1209 * Don't do anything if the station isn't already asleep. In
1210 * the uAPSD case, the station will probably be marked asleep,
1211 * in the PS-Poll case the station must be confused ...
1213 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1216 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1217 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1218 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1219 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1221 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1224 /* Free PS Poll skb here instead of returning RX_DROP that would
1225 * count as an dropped frame. */
1226 dev_kfree_skb(rx->skb);
1229 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1230 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1231 ieee80211_has_pm(hdr->frame_control) &&
1232 (ieee80211_is_data_qos(hdr->frame_control) ||
1233 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1234 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1235 ac = ieee802_1d_to_ac[tid & 7];
1238 * If this AC is not trigger-enabled do nothing.
1240 * NB: This could/should check a separate bitmap of trigger-
1241 * enabled queues, but for now we only implement uAPSD w/o
1242 * TSPEC changes to the ACs, so they're always the same.
1244 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1247 /* if we are in a service period, do nothing */
1248 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1251 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1252 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1254 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1260 static ieee80211_rx_result debug_noinline
1261 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1263 struct sta_info *sta = rx->sta;
1264 struct sk_buff *skb = rx->skb;
1265 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1266 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1272 * Update last_rx only for IBSS packets which are for the current
1273 * BSSID to avoid keeping the current IBSS network alive in cases
1274 * where other STAs start using different BSSID.
1276 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1277 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1278 NL80211_IFTYPE_ADHOC);
1279 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
1280 sta->last_rx = jiffies;
1281 if (ieee80211_is_data(hdr->frame_control)) {
1282 sta->last_rx_rate_idx = status->rate_idx;
1283 sta->last_rx_rate_flag = status->flag;
1286 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1288 * Mesh beacons will update last_rx when if they are found to
1289 * match the current local configuration when processed.
1291 sta->last_rx = jiffies;
1292 if (ieee80211_is_data(hdr->frame_control)) {
1293 sta->last_rx_rate_idx = status->rate_idx;
1294 sta->last_rx_rate_flag = status->flag;
1298 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1301 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1302 ieee80211_sta_rx_notify(rx->sdata, hdr);
1304 sta->rx_fragments++;
1305 sta->rx_bytes += rx->skb->len;
1306 sta->last_signal = status->signal;
1307 ewma_add(&sta->avg_signal, -status->signal);
1310 * Change STA power saving mode only at the end of a frame
1311 * exchange sequence.
1313 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1314 !ieee80211_has_morefrags(hdr->frame_control) &&
1315 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1316 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1317 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1318 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1320 * Ignore doze->wake transitions that are
1321 * indicated by non-data frames, the standard
1322 * is unclear here, but for example going to
1323 * PS mode and then scanning would cause a
1324 * doze->wake transition for the probe request,
1325 * and that is clearly undesirable.
1327 if (ieee80211_is_data(hdr->frame_control) &&
1328 !ieee80211_has_pm(hdr->frame_control))
1331 if (ieee80211_has_pm(hdr->frame_control))
1332 ap_sta_ps_start(sta);
1337 * Drop (qos-)data::nullfunc frames silently, since they
1338 * are used only to control station power saving mode.
1340 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1341 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1342 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1345 * If we receive a 4-addr nullfunc frame from a STA
1346 * that was not moved to a 4-addr STA vlan yet send
1347 * the event to userspace and for older hostapd drop
1348 * the frame to the monitor interface.
1350 if (ieee80211_has_a4(hdr->frame_control) &&
1351 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1353 !rx->sdata->u.vlan.sta))) {
1354 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1355 cfg80211_rx_unexpected_4addr_frame(
1356 rx->sdata->dev, sta->sta.addr,
1358 return RX_DROP_MONITOR;
1361 * Update counter and free packet here to avoid
1362 * counting this as a dropped packed.
1365 dev_kfree_skb(rx->skb);
1370 } /* ieee80211_rx_h_sta_process */
1372 static inline struct ieee80211_fragment_entry *
1373 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1374 unsigned int frag, unsigned int seq, int rx_queue,
1375 struct sk_buff **skb)
1377 struct ieee80211_fragment_entry *entry;
1380 idx = sdata->fragment_next;
1381 entry = &sdata->fragments[sdata->fragment_next++];
1382 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1383 sdata->fragment_next = 0;
1385 if (!skb_queue_empty(&entry->skb_list)) {
1386 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1387 struct ieee80211_hdr *hdr =
1388 (struct ieee80211_hdr *) entry->skb_list.next->data;
1389 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1390 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1391 "addr1=%pM addr2=%pM\n",
1393 jiffies - entry->first_frag_time, entry->seq,
1394 entry->last_frag, hdr->addr1, hdr->addr2);
1396 __skb_queue_purge(&entry->skb_list);
1399 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1401 entry->first_frag_time = jiffies;
1403 entry->rx_queue = rx_queue;
1404 entry->last_frag = frag;
1406 entry->extra_len = 0;
1411 static inline struct ieee80211_fragment_entry *
1412 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1413 unsigned int frag, unsigned int seq,
1414 int rx_queue, struct ieee80211_hdr *hdr)
1416 struct ieee80211_fragment_entry *entry;
1419 idx = sdata->fragment_next;
1420 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1421 struct ieee80211_hdr *f_hdr;
1425 idx = IEEE80211_FRAGMENT_MAX - 1;
1427 entry = &sdata->fragments[idx];
1428 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1429 entry->rx_queue != rx_queue ||
1430 entry->last_frag + 1 != frag)
1433 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1436 * Check ftype and addresses are equal, else check next fragment
1438 if (((hdr->frame_control ^ f_hdr->frame_control) &
1439 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1440 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1441 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1444 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1445 __skb_queue_purge(&entry->skb_list);
1454 static ieee80211_rx_result debug_noinline
1455 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1457 struct ieee80211_hdr *hdr;
1460 unsigned int frag, seq;
1461 struct ieee80211_fragment_entry *entry;
1462 struct sk_buff *skb;
1463 struct ieee80211_rx_status *status;
1465 hdr = (struct ieee80211_hdr *)rx->skb->data;
1466 fc = hdr->frame_control;
1467 sc = le16_to_cpu(hdr->seq_ctrl);
1468 frag = sc & IEEE80211_SCTL_FRAG;
1470 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1471 (rx->skb)->len < 24 ||
1472 is_multicast_ether_addr(hdr->addr1))) {
1473 /* not fragmented */
1476 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1478 if (skb_linearize(rx->skb))
1479 return RX_DROP_UNUSABLE;
1482 * skb_linearize() might change the skb->data and
1483 * previously cached variables (in this case, hdr) need to
1484 * be refreshed with the new data.
1486 hdr = (struct ieee80211_hdr *)rx->skb->data;
1487 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1490 /* This is the first fragment of a new frame. */
1491 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1492 rx->seqno_idx, &(rx->skb));
1493 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1494 ieee80211_has_protected(fc)) {
1495 int queue = rx->security_idx;
1496 /* Store CCMP PN so that we can verify that the next
1497 * fragment has a sequential PN value. */
1499 memcpy(entry->last_pn,
1500 rx->key->u.ccmp.rx_pn[queue],
1506 /* This is a fragment for a frame that should already be pending in
1507 * fragment cache. Add this fragment to the end of the pending entry.
1509 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1510 rx->seqno_idx, hdr);
1512 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1513 return RX_DROP_MONITOR;
1516 /* Verify that MPDUs within one MSDU have sequential PN values.
1517 * (IEEE 802.11i, 8.3.3.4.5) */
1520 u8 pn[CCMP_PN_LEN], *rpn;
1522 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1523 return RX_DROP_UNUSABLE;
1524 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1525 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1530 queue = rx->security_idx;
1531 rpn = rx->key->u.ccmp.rx_pn[queue];
1532 if (memcmp(pn, rpn, CCMP_PN_LEN))
1533 return RX_DROP_UNUSABLE;
1534 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1537 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1538 __skb_queue_tail(&entry->skb_list, rx->skb);
1539 entry->last_frag = frag;
1540 entry->extra_len += rx->skb->len;
1541 if (ieee80211_has_morefrags(fc)) {
1546 rx->skb = __skb_dequeue(&entry->skb_list);
1547 if (skb_tailroom(rx->skb) < entry->extra_len) {
1548 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1549 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1551 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1552 __skb_queue_purge(&entry->skb_list);
1553 return RX_DROP_UNUSABLE;
1556 while ((skb = __skb_dequeue(&entry->skb_list))) {
1557 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1561 /* Complete frame has been reassembled - process it now */
1562 status = IEEE80211_SKB_RXCB(rx->skb);
1563 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1567 rx->sta->rx_packets++;
1568 if (is_multicast_ether_addr(hdr->addr1))
1569 rx->local->dot11MulticastReceivedFrameCount++;
1571 ieee80211_led_rx(rx->local);
1576 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1578 if (unlikely(!rx->sta ||
1579 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1586 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1588 struct sk_buff *skb = rx->skb;
1589 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1592 * Pass through unencrypted frames if the hardware has
1593 * decrypted them already.
1595 if (status->flag & RX_FLAG_DECRYPTED)
1598 /* Drop unencrypted frames if key is set. */
1599 if (unlikely(!ieee80211_has_protected(fc) &&
1600 !ieee80211_is_nullfunc(fc) &&
1601 ieee80211_is_data(fc) &&
1602 (rx->key || rx->sdata->drop_unencrypted)))
1609 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1612 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1613 __le16 fc = hdr->frame_control;
1616 * Pass through unencrypted frames if the hardware has
1617 * decrypted them already.
1619 if (status->flag & RX_FLAG_DECRYPTED)
1622 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1623 if (unlikely(!ieee80211_has_protected(fc) &&
1624 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1626 if (ieee80211_is_deauth(fc))
1627 cfg80211_send_unprot_deauth(rx->sdata->dev,
1630 else if (ieee80211_is_disassoc(fc))
1631 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1636 /* BIP does not use Protected field, so need to check MMIE */
1637 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1638 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1639 if (ieee80211_is_deauth(fc))
1640 cfg80211_send_unprot_deauth(rx->sdata->dev,
1643 else if (ieee80211_is_disassoc(fc))
1644 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1650 * When using MFP, Action frames are not allowed prior to
1651 * having configured keys.
1653 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1654 ieee80211_is_robust_mgmt_frame(
1655 (struct ieee80211_hdr *) rx->skb->data)))
1663 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1665 struct ieee80211_sub_if_data *sdata = rx->sdata;
1666 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1667 bool check_port_control = false;
1668 struct ethhdr *ehdr;
1671 *port_control = false;
1672 if (ieee80211_has_a4(hdr->frame_control) &&
1673 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1676 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1677 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1679 if (!sdata->u.mgd.use_4addr)
1682 check_port_control = true;
1685 if (is_multicast_ether_addr(hdr->addr1) &&
1686 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1689 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1693 ehdr = (struct ethhdr *) rx->skb->data;
1694 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1695 *port_control = true;
1696 else if (check_port_control)
1703 * requires that rx->skb is a frame with ethernet header
1705 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1707 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1708 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1709 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1712 * Allow EAPOL frames to us/the PAE group address regardless
1713 * of whether the frame was encrypted or not.
1715 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1716 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1717 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1720 if (ieee80211_802_1x_port_control(rx) ||
1721 ieee80211_drop_unencrypted(rx, fc))
1728 * requires that rx->skb is a frame with ethernet header
1731 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1733 struct ieee80211_sub_if_data *sdata = rx->sdata;
1734 struct net_device *dev = sdata->dev;
1735 struct sk_buff *skb, *xmit_skb;
1736 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1737 struct sta_info *dsta;
1738 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1743 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1744 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1745 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1746 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1747 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1748 if (is_multicast_ether_addr(ehdr->h_dest)) {
1750 * send multicast frames both to higher layers in
1751 * local net stack and back to the wireless medium
1753 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1754 if (!xmit_skb && net_ratelimit())
1755 printk(KERN_DEBUG "%s: failed to clone "
1756 "multicast frame\n", dev->name);
1758 dsta = sta_info_get(sdata, skb->data);
1761 * The destination station is associated to
1762 * this AP (in this VLAN), so send the frame
1763 * directly to it and do not pass it to local
1773 int align __maybe_unused;
1775 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1777 * 'align' will only take the values 0 or 2 here
1778 * since all frames are required to be aligned
1779 * to 2-byte boundaries when being passed to
1780 * mac80211. That also explains the __skb_push()
1783 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1785 if (WARN_ON(skb_headroom(skb) < 3)) {
1789 u8 *data = skb->data;
1790 size_t len = skb_headlen(skb);
1792 memmove(skb->data, data, len);
1793 skb_set_tail_pointer(skb, len);
1799 /* deliver to local stack */
1800 skb->protocol = eth_type_trans(skb, dev);
1801 memset(skb->cb, 0, sizeof(skb->cb));
1802 netif_receive_skb(skb);
1808 * Send to wireless media and increase priority by 256 to
1809 * keep the received priority instead of reclassifying
1810 * the frame (see cfg80211_classify8021d).
1812 xmit_skb->priority += 256;
1813 xmit_skb->protocol = htons(ETH_P_802_3);
1814 skb_reset_network_header(xmit_skb);
1815 skb_reset_mac_header(xmit_skb);
1816 dev_queue_xmit(xmit_skb);
1820 static ieee80211_rx_result debug_noinline
1821 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1823 struct net_device *dev = rx->sdata->dev;
1824 struct sk_buff *skb = rx->skb;
1825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1826 __le16 fc = hdr->frame_control;
1827 struct sk_buff_head frame_list;
1828 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1830 if (unlikely(!ieee80211_is_data(fc)))
1833 if (unlikely(!ieee80211_is_data_present(fc)))
1834 return RX_DROP_MONITOR;
1836 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1839 if (ieee80211_has_a4(hdr->frame_control) &&
1840 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1841 !rx->sdata->u.vlan.sta)
1842 return RX_DROP_UNUSABLE;
1844 if (is_multicast_ether_addr(hdr->addr1) &&
1845 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1846 rx->sdata->u.vlan.sta) ||
1847 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1848 rx->sdata->u.mgd.use_4addr)))
1849 return RX_DROP_UNUSABLE;
1852 __skb_queue_head_init(&frame_list);
1854 if (skb_linearize(skb))
1855 return RX_DROP_UNUSABLE;
1857 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1858 rx->sdata->vif.type,
1859 rx->local->hw.extra_tx_headroom, true);
1861 while (!skb_queue_empty(&frame_list)) {
1862 rx->skb = __skb_dequeue(&frame_list);
1864 if (!ieee80211_frame_allowed(rx, fc)) {
1865 dev_kfree_skb(rx->skb);
1868 dev->stats.rx_packets++;
1869 dev->stats.rx_bytes += rx->skb->len;
1871 ieee80211_deliver_skb(rx);
1877 #ifdef CONFIG_MAC80211_MESH
1878 static ieee80211_rx_result
1879 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1881 struct ieee80211_hdr *fwd_hdr, *hdr;
1882 struct ieee80211_tx_info *info;
1883 struct ieee80211s_hdr *mesh_hdr;
1884 struct sk_buff *skb = rx->skb, *fwd_skb;
1885 struct ieee80211_local *local = rx->local;
1886 struct ieee80211_sub_if_data *sdata = rx->sdata;
1887 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1888 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1889 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1892 hdr = (struct ieee80211_hdr *) skb->data;
1893 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1894 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1896 /* frame is in RMC, don't forward */
1897 if (ieee80211_is_data(hdr->frame_control) &&
1898 is_multicast_ether_addr(hdr->addr1) &&
1899 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1900 return RX_DROP_MONITOR;
1902 if (!ieee80211_is_data(hdr->frame_control))
1906 return RX_DROP_MONITOR;
1908 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1909 struct mesh_path *mppath;
1913 if (is_multicast_ether_addr(hdr->addr1)) {
1914 mpp_addr = hdr->addr3;
1915 proxied_addr = mesh_hdr->eaddr1;
1917 mpp_addr = hdr->addr4;
1918 proxied_addr = mesh_hdr->eaddr2;
1922 mppath = mpp_path_lookup(proxied_addr, sdata);
1924 mpp_path_add(proxied_addr, mpp_addr, sdata);
1926 spin_lock_bh(&mppath->state_lock);
1927 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1928 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1929 spin_unlock_bh(&mppath->state_lock);
1934 /* Frame has reached destination. Don't forward */
1935 if (!is_multicast_ether_addr(hdr->addr1) &&
1936 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1939 q = ieee80211_select_queue_80211(local, skb, hdr);
1940 if (ieee80211_queue_stopped(&local->hw, q)) {
1941 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
1942 return RX_DROP_MONITOR;
1944 skb_set_queue_mapping(skb, q);
1946 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1949 if (!--mesh_hdr->ttl) {
1950 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1951 return RX_DROP_MONITOR;
1954 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1956 if (net_ratelimit())
1957 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1962 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1963 info = IEEE80211_SKB_CB(fwd_skb);
1964 memset(info, 0, sizeof(*info));
1965 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1966 info->control.vif = &rx->sdata->vif;
1967 info->control.jiffies = jiffies;
1968 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1969 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1970 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1971 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1972 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1974 /* unable to resolve next hop */
1975 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1976 0, reason, fwd_hdr->addr2, sdata);
1977 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
1979 return RX_DROP_MONITOR;
1982 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1983 ieee80211_add_pending_skb(local, fwd_skb);
1985 if (is_multicast_ether_addr(hdr->addr1) ||
1986 sdata->dev->flags & IFF_PROMISC)
1989 return RX_DROP_MONITOR;
1993 static ieee80211_rx_result debug_noinline
1994 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1996 struct ieee80211_sub_if_data *sdata = rx->sdata;
1997 struct ieee80211_local *local = rx->local;
1998 struct net_device *dev = sdata->dev;
1999 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2000 __le16 fc = hdr->frame_control;
2004 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2007 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2008 return RX_DROP_MONITOR;
2011 * Send unexpected-4addr-frame event to hostapd. For older versions,
2012 * also drop the frame to cooked monitor interfaces.
2014 if (ieee80211_has_a4(hdr->frame_control) &&
2015 sdata->vif.type == NL80211_IFTYPE_AP) {
2017 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2018 cfg80211_rx_unexpected_4addr_frame(
2019 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2020 return RX_DROP_MONITOR;
2023 err = __ieee80211_data_to_8023(rx, &port_control);
2025 return RX_DROP_UNUSABLE;
2027 if (!ieee80211_frame_allowed(rx, fc))
2028 return RX_DROP_MONITOR;
2030 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2031 unlikely(port_control) && sdata->bss) {
2032 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2040 dev->stats.rx_packets++;
2041 dev->stats.rx_bytes += rx->skb->len;
2043 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2044 !is_multicast_ether_addr(
2045 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2046 (!local->scanning &&
2047 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2048 mod_timer(&local->dynamic_ps_timer, jiffies +
2049 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2052 ieee80211_deliver_skb(rx);
2057 static ieee80211_rx_result debug_noinline
2058 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2060 struct ieee80211_local *local = rx->local;
2061 struct ieee80211_hw *hw = &local->hw;
2062 struct sk_buff *skb = rx->skb;
2063 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2064 struct tid_ampdu_rx *tid_agg_rx;
2068 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2071 if (ieee80211_is_back_req(bar->frame_control)) {
2073 __le16 control, start_seq_num;
2074 } __packed bar_data;
2077 return RX_DROP_MONITOR;
2079 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2080 &bar_data, sizeof(bar_data)))
2081 return RX_DROP_MONITOR;
2083 tid = le16_to_cpu(bar_data.control) >> 12;
2085 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2087 return RX_DROP_MONITOR;
2089 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2091 /* reset session timer */
2092 if (tid_agg_rx->timeout)
2093 mod_timer(&tid_agg_rx->session_timer,
2094 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2096 spin_lock(&tid_agg_rx->reorder_lock);
2097 /* release stored frames up to start of BAR */
2098 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2099 spin_unlock(&tid_agg_rx->reorder_lock);
2106 * After this point, we only want management frames,
2107 * so we can drop all remaining control frames to
2108 * cooked monitor interfaces.
2110 return RX_DROP_MONITOR;
2113 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2114 struct ieee80211_mgmt *mgmt,
2117 struct ieee80211_local *local = sdata->local;
2118 struct sk_buff *skb;
2119 struct ieee80211_mgmt *resp;
2121 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2122 /* Not to own unicast address */
2126 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2127 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2128 /* Not from the current AP or not associated yet. */
2132 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2133 /* Too short SA Query request frame */
2137 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2141 skb_reserve(skb, local->hw.extra_tx_headroom);
2142 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2143 memset(resp, 0, 24);
2144 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2145 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2146 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2147 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2148 IEEE80211_STYPE_ACTION);
2149 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2150 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2151 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2152 memcpy(resp->u.action.u.sa_query.trans_id,
2153 mgmt->u.action.u.sa_query.trans_id,
2154 WLAN_SA_QUERY_TR_ID_LEN);
2156 ieee80211_tx_skb(sdata, skb);
2159 static ieee80211_rx_result debug_noinline
2160 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2162 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2163 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2166 * From here on, look only at management frames.
2167 * Data and control frames are already handled,
2168 * and unknown (reserved) frames are useless.
2170 if (rx->skb->len < 24)
2171 return RX_DROP_MONITOR;
2173 if (!ieee80211_is_mgmt(mgmt->frame_control))
2174 return RX_DROP_MONITOR;
2176 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2177 ieee80211_is_beacon(mgmt->frame_control) &&
2178 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2179 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2180 rx->skb->data, rx->skb->len,
2181 status->freq, GFP_ATOMIC);
2182 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2185 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2186 return RX_DROP_MONITOR;
2188 if (ieee80211_drop_unencrypted_mgmt(rx))
2189 return RX_DROP_UNUSABLE;
2194 static ieee80211_rx_result debug_noinline
2195 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2197 struct ieee80211_local *local = rx->local;
2198 struct ieee80211_sub_if_data *sdata = rx->sdata;
2199 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2200 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2201 int len = rx->skb->len;
2203 if (!ieee80211_is_action(mgmt->frame_control))
2206 /* drop too small frames */
2207 if (len < IEEE80211_MIN_ACTION_SIZE)
2208 return RX_DROP_UNUSABLE;
2210 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2211 return RX_DROP_UNUSABLE;
2213 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2214 return RX_DROP_UNUSABLE;
2216 switch (mgmt->u.action.category) {
2217 case WLAN_CATEGORY_HT:
2218 /* reject HT action frames from stations not supporting HT */
2219 if (!rx->sta->sta.ht_cap.ht_supported)
2222 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2223 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2224 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2225 sdata->vif.type != NL80211_IFTYPE_AP &&
2226 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2229 /* verify action & smps_control are present */
2230 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2233 switch (mgmt->u.action.u.ht_smps.action) {
2234 case WLAN_HT_ACTION_SMPS: {
2235 struct ieee80211_supported_band *sband;
2238 /* convert to HT capability */
2239 switch (mgmt->u.action.u.ht_smps.smps_control) {
2240 case WLAN_HT_SMPS_CONTROL_DISABLED:
2241 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2243 case WLAN_HT_SMPS_CONTROL_STATIC:
2244 smps = WLAN_HT_CAP_SM_PS_STATIC;
2246 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2247 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2252 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2254 /* if no change do nothing */
2255 if ((rx->sta->sta.ht_cap.cap &
2256 IEEE80211_HT_CAP_SM_PS) == smps)
2259 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2260 rx->sta->sta.ht_cap.cap |= smps;
2262 sband = rx->local->hw.wiphy->bands[status->band];
2264 rate_control_rate_update(local, sband, rx->sta,
2265 IEEE80211_RC_SMPS_CHANGED,
2266 local->_oper_channel_type);
2274 case WLAN_CATEGORY_BACK:
2275 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2276 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2277 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2278 sdata->vif.type != NL80211_IFTYPE_AP &&
2279 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2282 /* verify action_code is present */
2283 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2286 switch (mgmt->u.action.u.addba_req.action_code) {
2287 case WLAN_ACTION_ADDBA_REQ:
2288 if (len < (IEEE80211_MIN_ACTION_SIZE +
2289 sizeof(mgmt->u.action.u.addba_req)))
2292 case WLAN_ACTION_ADDBA_RESP:
2293 if (len < (IEEE80211_MIN_ACTION_SIZE +
2294 sizeof(mgmt->u.action.u.addba_resp)))
2297 case WLAN_ACTION_DELBA:
2298 if (len < (IEEE80211_MIN_ACTION_SIZE +
2299 sizeof(mgmt->u.action.u.delba)))
2307 case WLAN_CATEGORY_SPECTRUM_MGMT:
2308 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2311 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2314 /* verify action_code is present */
2315 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2318 switch (mgmt->u.action.u.measurement.action_code) {
2319 case WLAN_ACTION_SPCT_MSR_REQ:
2320 if (len < (IEEE80211_MIN_ACTION_SIZE +
2321 sizeof(mgmt->u.action.u.measurement)))
2323 ieee80211_process_measurement_req(sdata, mgmt, len);
2325 case WLAN_ACTION_SPCT_CHL_SWITCH:
2326 if (len < (IEEE80211_MIN_ACTION_SIZE +
2327 sizeof(mgmt->u.action.u.chan_switch)))
2330 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2333 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2339 case WLAN_CATEGORY_SA_QUERY:
2340 if (len < (IEEE80211_MIN_ACTION_SIZE +
2341 sizeof(mgmt->u.action.u.sa_query)))
2344 switch (mgmt->u.action.u.sa_query.action) {
2345 case WLAN_ACTION_SA_QUERY_REQUEST:
2346 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2348 ieee80211_process_sa_query_req(sdata, mgmt, len);
2352 case WLAN_CATEGORY_SELF_PROTECTED:
2353 switch (mgmt->u.action.u.self_prot.action_code) {
2354 case WLAN_SP_MESH_PEERING_OPEN:
2355 case WLAN_SP_MESH_PEERING_CLOSE:
2356 case WLAN_SP_MESH_PEERING_CONFIRM:
2357 if (!ieee80211_vif_is_mesh(&sdata->vif))
2359 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2360 /* userspace handles this frame */
2363 case WLAN_SP_MGK_INFORM:
2364 case WLAN_SP_MGK_ACK:
2365 if (!ieee80211_vif_is_mesh(&sdata->vif))
2370 case WLAN_CATEGORY_MESH_ACTION:
2371 if (!ieee80211_vif_is_mesh(&sdata->vif))
2373 if (mesh_action_is_path_sel(mgmt) &&
2374 (!mesh_path_sel_is_hwmp(sdata)))
2382 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2383 /* will return in the next handlers */
2388 rx->sta->rx_packets++;
2389 dev_kfree_skb(rx->skb);
2393 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2394 skb_queue_tail(&sdata->skb_queue, rx->skb);
2395 ieee80211_queue_work(&local->hw, &sdata->work);
2397 rx->sta->rx_packets++;
2401 static ieee80211_rx_result debug_noinline
2402 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2404 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2406 /* skip known-bad action frames and return them in the next handler */
2407 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2411 * Getting here means the kernel doesn't know how to handle
2412 * it, but maybe userspace does ... include returned frames
2413 * so userspace can register for those to know whether ones
2414 * it transmitted were processed or returned.
2417 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2418 rx->skb->data, rx->skb->len,
2421 rx->sta->rx_packets++;
2422 dev_kfree_skb(rx->skb);
2430 static ieee80211_rx_result debug_noinline
2431 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2433 struct ieee80211_local *local = rx->local;
2434 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2435 struct sk_buff *nskb;
2436 struct ieee80211_sub_if_data *sdata = rx->sdata;
2437 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2439 if (!ieee80211_is_action(mgmt->frame_control))
2443 * For AP mode, hostapd is responsible for handling any action
2444 * frames that we didn't handle, including returning unknown
2445 * ones. For all other modes we will return them to the sender,
2446 * setting the 0x80 bit in the action category, as required by
2447 * 802.11-2007 7.3.1.11.
2448 * Newer versions of hostapd shall also use the management frame
2449 * registration mechanisms, but older ones still use cooked
2450 * monitor interfaces so push all frames there.
2452 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2453 (sdata->vif.type == NL80211_IFTYPE_AP ||
2454 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2455 return RX_DROP_MONITOR;
2457 /* do not return rejected action frames */
2458 if (mgmt->u.action.category & 0x80)
2459 return RX_DROP_UNUSABLE;
2461 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2464 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2466 nmgmt->u.action.category |= 0x80;
2467 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2468 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2470 memset(nskb->cb, 0, sizeof(nskb->cb));
2472 ieee80211_tx_skb(rx->sdata, nskb);
2474 dev_kfree_skb(rx->skb);
2478 static ieee80211_rx_result debug_noinline
2479 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2481 struct ieee80211_sub_if_data *sdata = rx->sdata;
2482 ieee80211_rx_result rxs;
2483 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2486 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2487 if (rxs != RX_CONTINUE)
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_BEACON):
2499 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2500 /* process for all: mesh, mlme, ibss */
2502 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2503 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2504 if (is_multicast_ether_addr(mgmt->da) &&
2505 !is_broadcast_ether_addr(mgmt->da))
2506 return RX_DROP_MONITOR;
2508 /* process only for station */
2509 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2510 return RX_DROP_MONITOR;
2512 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2513 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2514 /* process only for ibss */
2515 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2516 return RX_DROP_MONITOR;
2519 return RX_DROP_MONITOR;
2522 /* queue up frame and kick off work to process it */
2523 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2524 skb_queue_tail(&sdata->skb_queue, rx->skb);
2525 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2527 rx->sta->rx_packets++;
2532 /* TODO: use IEEE80211_RX_FRAGMENTED */
2533 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2534 struct ieee80211_rate *rate)
2536 struct ieee80211_sub_if_data *sdata;
2537 struct ieee80211_local *local = rx->local;
2538 struct ieee80211_rtap_hdr {
2539 struct ieee80211_radiotap_header hdr;
2545 struct sk_buff *skb = rx->skb, *skb2;
2546 struct net_device *prev_dev = NULL;
2547 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2550 * If cooked monitor has been processed already, then
2551 * don't do it again. If not, set the flag.
2553 if (rx->flags & IEEE80211_RX_CMNTR)
2555 rx->flags |= IEEE80211_RX_CMNTR;
2557 /* If there are no cooked monitor interfaces, just free the SKB */
2558 if (!local->cooked_mntrs)
2561 if (skb_headroom(skb) < sizeof(*rthdr) &&
2562 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2565 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2566 memset(rthdr, 0, sizeof(*rthdr));
2567 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2568 rthdr->hdr.it_present =
2569 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2570 (1 << IEEE80211_RADIOTAP_CHANNEL));
2573 rthdr->rate_or_pad = rate->bitrate / 5;
2574 rthdr->hdr.it_present |=
2575 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2577 rthdr->chan_freq = cpu_to_le16(status->freq);
2579 if (status->band == IEEE80211_BAND_5GHZ)
2580 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2581 IEEE80211_CHAN_5GHZ);
2583 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2584 IEEE80211_CHAN_2GHZ);
2586 skb_set_mac_header(skb, 0);
2587 skb->ip_summed = CHECKSUM_UNNECESSARY;
2588 skb->pkt_type = PACKET_OTHERHOST;
2589 skb->protocol = htons(ETH_P_802_2);
2591 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2592 if (!ieee80211_sdata_running(sdata))
2595 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2596 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2600 skb2 = skb_clone(skb, GFP_ATOMIC);
2602 skb2->dev = prev_dev;
2603 netif_receive_skb(skb2);
2607 prev_dev = sdata->dev;
2608 sdata->dev->stats.rx_packets++;
2609 sdata->dev->stats.rx_bytes += skb->len;
2613 skb->dev = prev_dev;
2614 netif_receive_skb(skb);
2622 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2623 ieee80211_rx_result res)
2626 case RX_DROP_MONITOR:
2627 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2629 rx->sta->rx_dropped++;
2632 struct ieee80211_rate *rate = NULL;
2633 struct ieee80211_supported_band *sband;
2634 struct ieee80211_rx_status *status;
2636 status = IEEE80211_SKB_RXCB((rx->skb));
2638 sband = rx->local->hw.wiphy->bands[status->band];
2639 if (!(status->flag & RX_FLAG_HT))
2640 rate = &sband->bitrates[status->rate_idx];
2642 ieee80211_rx_cooked_monitor(rx, rate);
2645 case RX_DROP_UNUSABLE:
2646 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2648 rx->sta->rx_dropped++;
2649 dev_kfree_skb(rx->skb);
2652 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2657 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2659 ieee80211_rx_result res = RX_DROP_MONITOR;
2660 struct sk_buff *skb;
2662 #define CALL_RXH(rxh) \
2665 if (res != RX_CONTINUE) \
2669 spin_lock(&rx->local->rx_skb_queue.lock);
2670 if (rx->local->running_rx_handler)
2673 rx->local->running_rx_handler = true;
2675 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2676 spin_unlock(&rx->local->rx_skb_queue.lock);
2679 * all the other fields are valid across frames
2680 * that belong to an aMPDU since they are on the
2681 * same TID from the same station
2685 CALL_RXH(ieee80211_rx_h_decrypt)
2686 CALL_RXH(ieee80211_rx_h_check_more_data)
2687 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2688 CALL_RXH(ieee80211_rx_h_sta_process)
2689 CALL_RXH(ieee80211_rx_h_defragment)
2690 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2691 /* must be after MMIC verify so header is counted in MPDU mic */
2692 #ifdef CONFIG_MAC80211_MESH
2693 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2694 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2696 CALL_RXH(ieee80211_rx_h_amsdu)
2697 CALL_RXH(ieee80211_rx_h_data)
2698 CALL_RXH(ieee80211_rx_h_ctrl);
2699 CALL_RXH(ieee80211_rx_h_mgmt_check)
2700 CALL_RXH(ieee80211_rx_h_action)
2701 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2702 CALL_RXH(ieee80211_rx_h_action_return)
2703 CALL_RXH(ieee80211_rx_h_mgmt)
2706 ieee80211_rx_handlers_result(rx, res);
2707 spin_lock(&rx->local->rx_skb_queue.lock);
2711 rx->local->running_rx_handler = false;
2714 spin_unlock(&rx->local->rx_skb_queue.lock);
2717 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2719 ieee80211_rx_result res = RX_DROP_MONITOR;
2721 #define CALL_RXH(rxh) \
2724 if (res != RX_CONTINUE) \
2728 CALL_RXH(ieee80211_rx_h_passive_scan)
2729 CALL_RXH(ieee80211_rx_h_check)
2731 ieee80211_rx_reorder_ampdu(rx);
2733 ieee80211_rx_handlers(rx);
2737 ieee80211_rx_handlers_result(rx, res);
2743 * This function makes calls into the RX path, therefore
2744 * it has to be invoked under RCU read lock.
2746 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2748 struct ieee80211_rx_data rx = {
2750 .sdata = sta->sdata,
2751 .local = sta->local,
2752 /* This is OK -- must be QoS data frame */
2753 .security_idx = tid,
2757 struct tid_ampdu_rx *tid_agg_rx;
2759 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2763 spin_lock(&tid_agg_rx->reorder_lock);
2764 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2765 spin_unlock(&tid_agg_rx->reorder_lock);
2767 ieee80211_rx_handlers(&rx);
2770 /* main receive path */
2772 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2773 struct ieee80211_hdr *hdr)
2775 struct ieee80211_sub_if_data *sdata = rx->sdata;
2776 struct sk_buff *skb = rx->skb;
2777 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2778 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2779 int multicast = is_multicast_ether_addr(hdr->addr1);
2781 switch (sdata->vif.type) {
2782 case NL80211_IFTYPE_STATION:
2783 if (!bssid && !sdata->u.mgd.use_4addr)
2786 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2787 if (!(sdata->dev->flags & IFF_PROMISC) ||
2788 sdata->u.mgd.use_4addr)
2790 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2793 case NL80211_IFTYPE_ADHOC:
2796 if (ieee80211_is_beacon(hdr->frame_control)) {
2799 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2800 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2802 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2803 } else if (!multicast &&
2804 compare_ether_addr(sdata->vif.addr,
2806 if (!(sdata->dev->flags & IFF_PROMISC))
2808 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2809 } else if (!rx->sta) {
2811 if (status->flag & RX_FLAG_HT)
2812 rate_idx = 0; /* TODO: HT rates */
2814 rate_idx = status->rate_idx;
2815 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2819 case NL80211_IFTYPE_MESH_POINT:
2821 compare_ether_addr(sdata->vif.addr,
2823 if (!(sdata->dev->flags & IFF_PROMISC))
2826 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2829 case NL80211_IFTYPE_AP_VLAN:
2830 case NL80211_IFTYPE_AP:
2832 if (compare_ether_addr(sdata->vif.addr,
2835 } else if (!ieee80211_bssid_match(bssid,
2838 * Accept public action frames even when the
2839 * BSSID doesn't match, this is used for P2P
2840 * and location updates. Note that mac80211
2841 * itself never looks at these frames.
2843 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2844 ieee80211_is_public_action(hdr, skb->len))
2846 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2847 !ieee80211_is_beacon(hdr->frame_control))
2849 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2852 case NL80211_IFTYPE_WDS:
2853 if (bssid || !ieee80211_is_data(hdr->frame_control))
2855 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2859 /* should never get here */
2868 * This function returns whether or not the SKB
2869 * was destined for RX processing or not, which,
2870 * if consume is true, is equivalent to whether
2871 * or not the skb was consumed.
2873 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2874 struct sk_buff *skb, bool consume)
2876 struct ieee80211_local *local = rx->local;
2877 struct ieee80211_sub_if_data *sdata = rx->sdata;
2878 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2879 struct ieee80211_hdr *hdr = (void *)skb->data;
2883 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2884 prepares = prepare_for_handlers(rx, hdr);
2890 skb = skb_copy(skb, GFP_ATOMIC);
2892 if (net_ratelimit())
2893 wiphy_debug(local->hw.wiphy,
2894 "failed to copy skb for %s\n",
2902 ieee80211_invoke_rx_handlers(rx);
2907 * This is the actual Rx frames handler. as it blongs to Rx path it must
2908 * be called with rcu_read_lock protection.
2910 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2911 struct sk_buff *skb)
2913 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2914 struct ieee80211_local *local = hw_to_local(hw);
2915 struct ieee80211_sub_if_data *sdata;
2916 struct ieee80211_hdr *hdr;
2918 struct ieee80211_rx_data rx;
2919 struct ieee80211_sub_if_data *prev;
2920 struct sta_info *sta, *tmp, *prev_sta;
2923 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2924 memset(&rx, 0, sizeof(rx));
2928 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2929 local->dot11ReceivedFragmentCount++;
2931 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2932 test_bit(SCAN_SW_SCANNING, &local->scanning)))
2933 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2935 if (ieee80211_is_mgmt(fc))
2936 err = skb_linearize(skb);
2938 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2945 hdr = (struct ieee80211_hdr *)skb->data;
2946 ieee80211_parse_qos(&rx);
2947 ieee80211_verify_alignment(&rx);
2949 if (ieee80211_is_data(fc)) {
2952 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
2959 rx.sdata = prev_sta->sdata;
2960 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2967 rx.sdata = prev_sta->sdata;
2969 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2977 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2978 if (!ieee80211_sdata_running(sdata))
2981 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2982 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2986 * frame is destined for this interface, but if it's
2987 * not also for the previous one we handle that after
2988 * the loop to avoid copying the SKB once too much
2996 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
2998 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3004 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
3007 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3016 * This is the receive path handler. It is called by a low level driver when an
3017 * 802.11 MPDU is received from the hardware.
3019 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3021 struct ieee80211_local *local = hw_to_local(hw);
3022 struct ieee80211_rate *rate = NULL;
3023 struct ieee80211_supported_band *sband;
3024 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3026 WARN_ON_ONCE(softirq_count() == 0);
3028 if (WARN_ON(status->band < 0 ||
3029 status->band >= IEEE80211_NUM_BANDS))
3032 sband = local->hw.wiphy->bands[status->band];
3033 if (WARN_ON(!sband))
3037 * If we're suspending, it is possible although not too likely
3038 * that we'd be receiving frames after having already partially
3039 * quiesced the stack. We can't process such frames then since
3040 * that might, for example, cause stations to be added or other
3041 * driver callbacks be invoked.
3043 if (unlikely(local->quiescing || local->suspended))
3047 * The same happens when we're not even started,
3048 * but that's worth a warning.
3050 if (WARN_ON(!local->started))
3053 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3055 * Validate the rate, unless a PLCP error means that
3056 * we probably can't have a valid rate here anyway.
3059 if (status->flag & RX_FLAG_HT) {
3061 * rate_idx is MCS index, which can be [0-76]
3064 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3066 * Anything else would be some sort of driver or
3067 * hardware error. The driver should catch hardware
3070 if (WARN((status->rate_idx < 0 ||
3071 status->rate_idx > 76),
3072 "Rate marked as an HT rate but passed "
3073 "status->rate_idx is not "
3074 "an MCS index [0-76]: %d (0x%02x)\n",
3079 if (WARN_ON(status->rate_idx < 0 ||
3080 status->rate_idx >= sband->n_bitrates))
3082 rate = &sband->bitrates[status->rate_idx];
3086 status->rx_flags = 0;
3089 * key references and virtual interfaces are protected using RCU
3090 * and this requires that we are in a read-side RCU section during
3091 * receive processing
3096 * Frames with failed FCS/PLCP checksum are not returned,
3097 * all other frames are returned without radiotap header
3098 * if it was previously present.
3099 * Also, frames with less than 16 bytes are dropped.
3101 skb = ieee80211_rx_monitor(local, skb, rate);
3107 ieee80211_tpt_led_trig_rx(local,
3108 ((struct ieee80211_hdr *)skb->data)->frame_control,
3110 __ieee80211_rx_handle_packet(hw, skb);
3118 EXPORT_SYMBOL(ieee80211_rx);
3120 /* This is a version of the rx handler that can be called from hard irq
3121 * context. Post the skb on the queue and schedule the tasklet */
3122 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3124 struct ieee80211_local *local = hw_to_local(hw);
3126 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3128 skb->pkt_type = IEEE80211_RX_MSG;
3129 skb_queue_tail(&local->skb_queue, skb);
3130 tasklet_schedule(&local->tasklet);
3132 EXPORT_SYMBOL(ieee80211_rx_irqsafe);