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 <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
32 * monitor mode reception
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
37 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
42 __pskb_trim(skb, skb->len - FCS_LEN);
54 static inline int should_drop_frame(struct sk_buff *skb,
57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
62 if (unlikely(skb->len < 16 + present_fcs_len))
64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
72 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
80 if (status->flag & RX_FLAG_TSFT)
82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
85 if (len & 1) /* padding for RX_FLAGS if necessary */
92 * ieee80211_add_rx_radiotap_header - add radiotap header
94 * add a radiotap header containing all the fields which the hardware provided.
97 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
99 struct ieee80211_rate *rate,
102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
103 struct ieee80211_radiotap_header *rthdr;
107 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
108 memset(rthdr, 0, rtap_len);
110 /* radiotap header, set always present flags */
112 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
113 (1 << IEEE80211_RADIOTAP_CHANNEL) |
114 (1 << IEEE80211_RADIOTAP_ANTENNA) |
115 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
116 rthdr->it_len = cpu_to_le16(rtap_len);
118 pos = (unsigned char *)(rthdr+1);
120 /* the order of the following fields is important */
122 /* IEEE80211_RADIOTAP_TSFT */
123 if (status->flag & RX_FLAG_TSFT) {
124 put_unaligned_le64(status->mactime, pos);
126 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
130 /* IEEE80211_RADIOTAP_FLAGS */
131 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
132 *pos |= IEEE80211_RADIOTAP_F_FCS;
133 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
134 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
135 if (status->flag & RX_FLAG_SHORTPRE)
136 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
139 /* IEEE80211_RADIOTAP_RATE */
140 if (status->flag & RX_FLAG_HT) {
142 * TODO: add following information into radiotap header once
143 * suitable fields are defined for it:
144 * - MCS index (status->rate_idx)
145 * - HT40 (status->flag & RX_FLAG_40MHZ)
146 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
150 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
151 *pos = rate->bitrate / 5;
155 /* IEEE80211_RADIOTAP_CHANNEL */
156 put_unaligned_le16(status->freq, pos);
158 if (status->band == IEEE80211_BAND_5GHZ)
159 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
161 else if (status->flag & RX_FLAG_HT)
162 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
164 else if (rate->flags & IEEE80211_RATE_ERP_G)
165 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
168 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
172 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
174 *pos = status->signal;
176 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
180 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
182 /* IEEE80211_RADIOTAP_ANTENNA */
183 *pos = status->antenna;
186 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
188 /* IEEE80211_RADIOTAP_RX_FLAGS */
189 /* ensure 2 byte alignment for the 2 byte field as required */
190 if ((pos - (u8 *)rthdr) & 1)
192 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
193 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
194 put_unaligned_le16(rx_flags, pos);
199 * This function copies a received frame to all monitor interfaces and
200 * returns a cleaned-up SKB that no longer includes the FCS nor the
201 * radiotap header the driver might have added.
203 static struct sk_buff *
204 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
205 struct ieee80211_rate *rate)
207 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
208 struct ieee80211_sub_if_data *sdata;
209 int needed_headroom = 0;
210 struct sk_buff *skb, *skb2;
211 struct net_device *prev_dev = NULL;
212 int present_fcs_len = 0;
215 * First, we may need to make a copy of the skb because
216 * (1) we need to modify it for radiotap (if not present), and
217 * (2) the other RX handlers will modify the skb we got.
219 * We don't need to, of course, if we aren't going to return
220 * the SKB because it has a bad FCS/PLCP checksum.
223 /* room for the radiotap header based on driver features */
224 needed_headroom = ieee80211_rx_radiotap_len(local, status);
226 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
227 present_fcs_len = FCS_LEN;
229 /* make sure hdr->frame_control is on the linear part */
230 if (!pskb_may_pull(origskb, 2)) {
231 dev_kfree_skb(origskb);
235 if (!local->monitors) {
236 if (should_drop_frame(origskb, present_fcs_len)) {
237 dev_kfree_skb(origskb);
241 return remove_monitor_info(local, origskb);
244 if (should_drop_frame(origskb, present_fcs_len)) {
245 /* only need to expand headroom if necessary */
250 * This shouldn't trigger often because most devices have an
251 * RX header they pull before we get here, and that should
252 * be big enough for our radiotap information. We should
253 * probably export the length to drivers so that we can have
254 * them allocate enough headroom to start with.
256 if (skb_headroom(skb) < needed_headroom &&
257 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
263 * Need to make a copy and possibly remove radiotap header
264 * and FCS from the original.
266 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
268 origskb = remove_monitor_info(local, origskb);
274 /* prepend radiotap information */
275 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
277 skb_reset_mac_header(skb);
278 skb->ip_summed = CHECKSUM_UNNECESSARY;
279 skb->pkt_type = PACKET_OTHERHOST;
280 skb->protocol = htons(ETH_P_802_2);
282 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
283 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
286 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
289 if (!ieee80211_sdata_running(sdata))
293 skb2 = skb_clone(skb, GFP_ATOMIC);
295 skb2->dev = prev_dev;
300 prev_dev = sdata->dev;
301 sdata->dev->stats.rx_packets++;
302 sdata->dev->stats.rx_bytes += skb->len;
315 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
320 /* does the frame have a qos control field? */
321 if (ieee80211_is_data_qos(hdr->frame_control)) {
322 u8 *qc = ieee80211_get_qos_ctl(hdr);
323 /* frame has qos control */
324 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
325 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
326 rx->flags |= IEEE80211_RX_AMSDU;
328 rx->flags &= ~IEEE80211_RX_AMSDU;
331 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
333 * Sequence numbers for management frames, QoS data
334 * frames with a broadcast/multicast address in the
335 * Address 1 field, and all non-QoS data frames sent
336 * by QoS STAs are assigned using an additional single
337 * modulo-4096 counter, [...]
339 * We also use that counter for non-QoS STAs.
341 tid = NUM_RX_DATA_QUEUES - 1;
345 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
346 * For now, set skb->priority to 0 for other cases. */
347 rx->skb->priority = (tid > 7) ? 0 : tid;
351 * DOC: Packet alignment
353 * Drivers always need to pass packets that are aligned to two-byte boundaries
356 * Additionally, should, if possible, align the payload data in a way that
357 * guarantees that the contained IP header is aligned to a four-byte
358 * boundary. In the case of regular frames, this simply means aligning the
359 * payload to a four-byte boundary (because either the IP header is directly
360 * contained, or IV/RFC1042 headers that have a length divisible by four are
361 * in front of it). If the payload data is not properly aligned and the
362 * architecture doesn't support efficient unaligned operations, mac80211
363 * will align the data.
365 * With A-MSDU frames, however, the payload data address must yield two modulo
366 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
367 * push the IP header further back to a multiple of four again. Thankfully, the
368 * specs were sane enough this time around to require padding each A-MSDU
369 * subframe to a length that is a multiple of four.
371 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
372 * the payload is not supported, the driver is required to move the 802.11
373 * header to be directly in front of the payload in that case.
375 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
377 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
378 WARN_ONCE((unsigned long)rx->skb->data & 1,
379 "unaligned packet at 0x%p\n", rx->skb->data);
386 static ieee80211_rx_result debug_noinline
387 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
389 struct ieee80211_local *local = rx->local;
390 struct sk_buff *skb = rx->skb;
392 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
393 return ieee80211_scan_rx(rx->sdata, skb);
395 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
396 (rx->flags & IEEE80211_RX_IN_SCAN))) {
397 /* drop all the other packets during a software scan anyway */
398 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
403 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
404 /* scanning finished during invoking of handlers */
405 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
406 return RX_DROP_UNUSABLE;
413 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
415 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
417 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
420 return ieee80211_is_robust_mgmt_frame(hdr);
424 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
426 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
428 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
431 return ieee80211_is_robust_mgmt_frame(hdr);
435 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
436 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
438 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
439 struct ieee80211_mmie *mmie;
441 if (skb->len < 24 + sizeof(*mmie) ||
442 !is_multicast_ether_addr(hdr->da))
445 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
446 return -1; /* not a robust management frame */
448 mmie = (struct ieee80211_mmie *)
449 (skb->data + skb->len - sizeof(*mmie));
450 if (mmie->element_id != WLAN_EID_MMIE ||
451 mmie->length != sizeof(*mmie) - 2)
454 return le16_to_cpu(mmie->key_id);
458 static ieee80211_rx_result
459 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
461 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
462 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
463 char *dev_addr = rx->sdata->vif.addr;
465 if (ieee80211_is_data(hdr->frame_control)) {
466 if (is_multicast_ether_addr(hdr->addr1)) {
467 if (ieee80211_has_tods(hdr->frame_control) ||
468 !ieee80211_has_fromds(hdr->frame_control))
469 return RX_DROP_MONITOR;
470 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
471 return RX_DROP_MONITOR;
473 if (!ieee80211_has_a4(hdr->frame_control))
474 return RX_DROP_MONITOR;
475 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
476 return RX_DROP_MONITOR;
480 /* If there is not an established peer link and this is not a peer link
481 * establisment frame, beacon or probe, drop the frame.
484 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
485 struct ieee80211_mgmt *mgmt;
487 if (!ieee80211_is_mgmt(hdr->frame_control))
488 return RX_DROP_MONITOR;
490 if (ieee80211_is_action(hdr->frame_control)) {
491 mgmt = (struct ieee80211_mgmt *)hdr;
492 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
493 return RX_DROP_MONITOR;
497 if (ieee80211_is_probe_req(hdr->frame_control) ||
498 ieee80211_is_probe_resp(hdr->frame_control) ||
499 ieee80211_is_beacon(hdr->frame_control))
502 return RX_DROP_MONITOR;
506 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
508 if (ieee80211_is_data(hdr->frame_control) &&
509 is_multicast_ether_addr(hdr->addr1) &&
510 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
511 return RX_DROP_MONITOR;
517 #define SEQ_MODULO 0x1000
518 #define SEQ_MASK 0xfff
520 static inline int seq_less(u16 sq1, u16 sq2)
522 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
525 static inline u16 seq_inc(u16 sq)
527 return (sq + 1) & SEQ_MASK;
530 static inline u16 seq_sub(u16 sq1, u16 sq2)
532 return (sq1 - sq2) & SEQ_MASK;
536 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
537 struct tid_ampdu_rx *tid_agg_rx,
539 struct sk_buff_head *frames)
541 struct ieee80211_supported_band *sband;
542 struct ieee80211_rate *rate = NULL;
543 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
544 struct ieee80211_rx_status *status;
549 status = IEEE80211_SKB_RXCB(skb);
551 /* release the reordered frames to stack */
552 sband = hw->wiphy->bands[status->band];
553 if (!(status->flag & RX_FLAG_HT))
554 rate = &sband->bitrates[status->rate_idx];
555 tid_agg_rx->stored_mpdu_num--;
556 tid_agg_rx->reorder_buf[index] = NULL;
557 __skb_queue_tail(frames, skb);
560 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
563 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
564 struct tid_ampdu_rx *tid_agg_rx,
566 struct sk_buff_head *frames)
570 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
571 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
572 tid_agg_rx->buf_size;
573 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
578 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
579 * the skb was added to the buffer longer than this time ago, the earlier
580 * frames that have not yet been received are assumed to be lost and the skb
581 * can be released for processing. This may also release other skb's from the
582 * reorder buffer if there are no additional gaps between the frames.
584 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
587 * As this function belongs to the RX path it must be under
588 * rcu_read_lock protection. It returns false if the frame
589 * can be processed immediately, true if it was consumed.
591 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
592 struct tid_ampdu_rx *tid_agg_rx,
594 struct sk_buff_head *frames)
596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
597 u16 sc = le16_to_cpu(hdr->seq_ctrl);
598 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
599 u16 head_seq_num, buf_size;
602 buf_size = tid_agg_rx->buf_size;
603 head_seq_num = tid_agg_rx->head_seq_num;
605 /* frame with out of date sequence number */
606 if (seq_less(mpdu_seq_num, head_seq_num)) {
612 * If frame the sequence number exceeds our buffering window
613 * size release some previous frames to make room for this one.
615 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
616 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
617 /* release stored frames up to new head to stack */
618 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
622 /* Now the new frame is always in the range of the reordering buffer */
624 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
626 /* check if we already stored this frame */
627 if (tid_agg_rx->reorder_buf[index]) {
633 * If the current MPDU is in the right order and nothing else
634 * is stored we can process it directly, no need to buffer it.
636 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
637 tid_agg_rx->stored_mpdu_num == 0) {
638 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
642 /* put the frame in the reordering buffer */
643 tid_agg_rx->reorder_buf[index] = skb;
644 tid_agg_rx->reorder_time[index] = jiffies;
645 tid_agg_rx->stored_mpdu_num++;
646 /* release the buffer until next missing frame */
647 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
648 tid_agg_rx->buf_size;
649 if (!tid_agg_rx->reorder_buf[index] &&
650 tid_agg_rx->stored_mpdu_num > 1) {
652 * No buffers ready to be released, but check whether any
653 * frames in the reorder buffer have timed out.
657 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
658 j = (j + 1) % tid_agg_rx->buf_size) {
659 if (!tid_agg_rx->reorder_buf[j]) {
663 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
664 HT_RX_REORDER_BUF_TIMEOUT))
667 #ifdef CONFIG_MAC80211_HT_DEBUG
669 printk(KERN_DEBUG "%s: release an RX reorder "
670 "frame due to timeout on earlier "
672 wiphy_name(hw->wiphy));
674 ieee80211_release_reorder_frame(hw, tid_agg_rx,
678 * Increment the head seq# also for the skipped slots.
680 tid_agg_rx->head_seq_num =
681 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
684 } else while (tid_agg_rx->reorder_buf[index]) {
685 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
686 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
687 tid_agg_rx->buf_size;
694 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
695 * true if the MPDU was buffered, false if it should be processed.
697 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
698 struct sk_buff_head *frames)
700 struct sk_buff *skb = rx->skb;
701 struct ieee80211_local *local = rx->local;
702 struct ieee80211_hw *hw = &local->hw;
703 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
704 struct sta_info *sta = rx->sta;
705 struct tid_ampdu_rx *tid_agg_rx;
709 if (!ieee80211_is_data_qos(hdr->frame_control))
713 * filter the QoS data rx stream according to
714 * STA/TID and check if this STA/TID is on aggregation
720 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
722 spin_lock(&sta->lock);
724 if (!sta->ampdu_mlme.tid_active_rx[tid])
725 goto dont_reorder_unlock;
727 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
729 /* qos null data frames are excluded */
730 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
731 goto dont_reorder_unlock;
733 /* new, potentially un-ordered, ampdu frame - process it */
735 /* reset session timer */
736 if (tid_agg_rx->timeout)
737 mod_timer(&tid_agg_rx->session_timer,
738 TU_TO_EXP_TIME(tid_agg_rx->timeout));
740 /* if this mpdu is fragmented - terminate rx aggregation session */
741 sc = le16_to_cpu(hdr->seq_ctrl);
742 if (sc & IEEE80211_SCTL_FRAG) {
743 spin_unlock(&sta->lock);
744 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
745 WLAN_REASON_QSTA_REQUIRE_SETUP);
750 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames)) {
751 spin_unlock(&sta->lock);
756 spin_unlock(&sta->lock);
758 __skb_queue_tail(frames, skb);
761 static ieee80211_rx_result debug_noinline
762 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
764 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
766 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
767 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
768 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
769 rx->sta->last_seq_ctrl[rx->queue] ==
771 if (rx->flags & IEEE80211_RX_RA_MATCH) {
772 rx->local->dot11FrameDuplicateCount++;
773 rx->sta->num_duplicates++;
775 return RX_DROP_MONITOR;
777 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
780 if (unlikely(rx->skb->len < 16)) {
781 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
782 return RX_DROP_MONITOR;
785 /* Drop disallowed frame classes based on STA auth/assoc state;
786 * IEEE 802.11, Chap 5.5.
788 * mac80211 filters only based on association state, i.e. it drops
789 * Class 3 frames from not associated stations. hostapd sends
790 * deauth/disassoc frames when needed. In addition, hostapd is
791 * responsible for filtering on both auth and assoc states.
794 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
795 return ieee80211_rx_mesh_check(rx);
797 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
798 ieee80211_is_pspoll(hdr->frame_control)) &&
799 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
800 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
801 if ((!ieee80211_has_fromds(hdr->frame_control) &&
802 !ieee80211_has_tods(hdr->frame_control) &&
803 ieee80211_is_data(hdr->frame_control)) ||
804 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
805 /* Drop IBSS frames and frames for other hosts
807 return RX_DROP_MONITOR;
810 return RX_DROP_MONITOR;
817 static ieee80211_rx_result debug_noinline
818 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
820 struct sk_buff *skb = rx->skb;
821 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
822 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
825 ieee80211_rx_result result = RX_DROP_UNUSABLE;
826 struct ieee80211_key *stakey = NULL;
827 int mmie_keyidx = -1;
833 * There are four types of keys:
835 * - IGTK (group keys for management frames)
836 * - PTK (pairwise keys)
837 * - STK (station-to-station pairwise keys)
839 * When selecting a key, we have to distinguish between multicast
840 * (including broadcast) and unicast frames, the latter can only
841 * use PTKs and STKs while the former always use GTKs and IGTKs.
842 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
843 * unicast frames can also use key indices like GTKs. Hence, if we
844 * don't have a PTK/STK we check the key index for a WEP key.
846 * Note that in a regular BSS, multicast frames are sent by the
847 * AP only, associated stations unicast the frame to the AP first
848 * which then multicasts it on their behalf.
850 * There is also a slight problem in IBSS mode: GTKs are negotiated
851 * with each station, that is something we don't currently handle.
852 * The spec seems to expect that one negotiates the same key with
853 * every station but there's no such requirement; VLANs could be
858 * No point in finding a key and decrypting if the frame is neither
859 * addressed to us nor a multicast frame.
861 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
864 /* start without a key */
868 stakey = rcu_dereference(rx->sta->key);
870 fc = hdr->frame_control;
872 if (!ieee80211_has_protected(fc))
873 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
875 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
877 /* Skip decryption if the frame is not protected. */
878 if (!ieee80211_has_protected(fc))
880 } else if (mmie_keyidx >= 0) {
881 /* Broadcast/multicast robust management frame / BIP */
882 if ((status->flag & RX_FLAG_DECRYPTED) &&
883 (status->flag & RX_FLAG_IV_STRIPPED))
886 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
887 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
888 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
889 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
890 } else if (!ieee80211_has_protected(fc)) {
892 * The frame was not protected, so skip decryption. However, we
893 * need to set rx->key if there is a key that could have been
894 * used so that the frame may be dropped if encryption would
895 * have been expected.
897 struct ieee80211_key *key = NULL;
898 if (ieee80211_is_mgmt(fc) &&
899 is_multicast_ether_addr(hdr->addr1) &&
900 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
902 else if ((key = rcu_dereference(rx->sdata->default_key)))
908 * The device doesn't give us the IV so we won't be
909 * able to look up the key. That's ok though, we
910 * don't need to decrypt the frame, we just won't
911 * be able to keep statistics accurate.
912 * Except for key threshold notifications, should
913 * we somehow allow the driver to tell us which key
914 * the hardware used if this flag is set?
916 if ((status->flag & RX_FLAG_DECRYPTED) &&
917 (status->flag & RX_FLAG_IV_STRIPPED))
920 hdrlen = ieee80211_hdrlen(fc);
922 if (rx->skb->len < 8 + hdrlen)
923 return RX_DROP_UNUSABLE; /* TODO: count this? */
926 * no need to call ieee80211_wep_get_keyidx,
927 * it verifies a bunch of things we've done already
929 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
932 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
935 * RSNA-protected unicast frames should always be sent with
936 * pairwise or station-to-station keys, but for WEP we allow
937 * using a key index as well.
939 if (rx->key && rx->key->conf.alg != ALG_WEP &&
940 !is_multicast_ether_addr(hdr->addr1))
945 rx->key->tx_rx_count++;
946 /* TODO: add threshold stuff again */
948 return RX_DROP_MONITOR;
951 if (skb_linearize(rx->skb))
952 return RX_DROP_UNUSABLE;
953 /* the hdr variable is invalid now! */
955 switch (rx->key->conf.alg) {
957 /* Check for weak IVs if possible */
958 if (rx->sta && ieee80211_is_data(fc) &&
959 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
960 !(status->flag & RX_FLAG_DECRYPTED)) &&
961 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
962 rx->sta->wep_weak_iv_count++;
964 result = ieee80211_crypto_wep_decrypt(rx);
967 result = ieee80211_crypto_tkip_decrypt(rx);
970 result = ieee80211_crypto_ccmp_decrypt(rx);
973 result = ieee80211_crypto_aes_cmac_decrypt(rx);
977 /* either the frame has been decrypted or will be dropped */
978 status->flag |= RX_FLAG_DECRYPTED;
983 static ieee80211_rx_result debug_noinline
984 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
986 struct ieee80211_local *local;
987 struct ieee80211_hdr *hdr;
992 hdr = (struct ieee80211_hdr *) skb->data;
994 if (!local->pspolling)
997 if (!ieee80211_has_fromds(hdr->frame_control))
998 /* this is not from AP */
1001 if (!ieee80211_is_data(hdr->frame_control))
1004 if (!ieee80211_has_moredata(hdr->frame_control)) {
1005 /* AP has no more frames buffered for us */
1006 local->pspolling = false;
1010 /* more data bit is set, let's request a new frame from the AP */
1011 ieee80211_send_pspoll(local, rx->sdata);
1016 static void ap_sta_ps_start(struct sta_info *sta)
1018 struct ieee80211_sub_if_data *sdata = sta->sdata;
1019 struct ieee80211_local *local = sdata->local;
1021 atomic_inc(&sdata->bss->num_sta_ps);
1022 set_sta_flags(sta, WLAN_STA_PS_STA);
1023 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1024 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1025 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1026 sdata->name, sta->sta.addr, sta->sta.aid);
1027 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1030 static void ap_sta_ps_end(struct sta_info *sta)
1032 struct ieee80211_sub_if_data *sdata = sta->sdata;
1034 atomic_dec(&sdata->bss->num_sta_ps);
1036 clear_sta_flags(sta, WLAN_STA_PS_STA);
1038 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1039 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1040 sdata->name, sta->sta.addr, sta->sta.aid);
1041 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1043 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
1044 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1045 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1046 sdata->name, sta->sta.addr, sta->sta.aid);
1047 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1051 ieee80211_sta_ps_deliver_wakeup(sta);
1054 static ieee80211_rx_result debug_noinline
1055 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1057 struct sta_info *sta = rx->sta;
1058 struct sk_buff *skb = rx->skb;
1059 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1060 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1066 * Update last_rx only for IBSS packets which are for the current
1067 * BSSID to avoid keeping the current IBSS network alive in cases
1068 * where other STAs start using different BSSID.
1070 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1071 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1072 NL80211_IFTYPE_ADHOC);
1073 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
1074 sta->last_rx = jiffies;
1075 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1077 * Mesh beacons will update last_rx when if they are found to
1078 * match the current local configuration when processed.
1080 sta->last_rx = jiffies;
1083 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1086 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1087 ieee80211_sta_rx_notify(rx->sdata, hdr);
1089 sta->rx_fragments++;
1090 sta->rx_bytes += rx->skb->len;
1091 sta->last_signal = status->signal;
1094 * Change STA power saving mode only at the end of a frame
1095 * exchange sequence.
1097 if (!ieee80211_has_morefrags(hdr->frame_control) &&
1098 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1099 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1100 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
1102 * Ignore doze->wake transitions that are
1103 * indicated by non-data frames, the standard
1104 * is unclear here, but for example going to
1105 * PS mode and then scanning would cause a
1106 * doze->wake transition for the probe request,
1107 * and that is clearly undesirable.
1109 if (ieee80211_is_data(hdr->frame_control) &&
1110 !ieee80211_has_pm(hdr->frame_control))
1113 if (ieee80211_has_pm(hdr->frame_control))
1114 ap_sta_ps_start(sta);
1119 * Drop (qos-)data::nullfunc frames silently, since they
1120 * are used only to control station power saving mode.
1122 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1123 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1124 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1127 * If we receive a 4-addr nullfunc frame from a STA
1128 * that was not moved to a 4-addr STA vlan yet, drop
1129 * the frame to the monitor interface, to make sure
1130 * that hostapd sees it
1132 if (ieee80211_has_a4(hdr->frame_control) &&
1133 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1134 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1135 !rx->sdata->u.vlan.sta)))
1136 return RX_DROP_MONITOR;
1138 * Update counter and free packet here to avoid
1139 * counting this as a dropped packed.
1142 dev_kfree_skb(rx->skb);
1147 } /* ieee80211_rx_h_sta_process */
1149 static inline struct ieee80211_fragment_entry *
1150 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1151 unsigned int frag, unsigned int seq, int rx_queue,
1152 struct sk_buff **skb)
1154 struct ieee80211_fragment_entry *entry;
1157 idx = sdata->fragment_next;
1158 entry = &sdata->fragments[sdata->fragment_next++];
1159 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1160 sdata->fragment_next = 0;
1162 if (!skb_queue_empty(&entry->skb_list)) {
1163 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1164 struct ieee80211_hdr *hdr =
1165 (struct ieee80211_hdr *) entry->skb_list.next->data;
1166 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1167 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1168 "addr1=%pM addr2=%pM\n",
1170 jiffies - entry->first_frag_time, entry->seq,
1171 entry->last_frag, hdr->addr1, hdr->addr2);
1173 __skb_queue_purge(&entry->skb_list);
1176 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1178 entry->first_frag_time = jiffies;
1180 entry->rx_queue = rx_queue;
1181 entry->last_frag = frag;
1183 entry->extra_len = 0;
1188 static inline struct ieee80211_fragment_entry *
1189 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1190 unsigned int frag, unsigned int seq,
1191 int rx_queue, struct ieee80211_hdr *hdr)
1193 struct ieee80211_fragment_entry *entry;
1196 idx = sdata->fragment_next;
1197 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1198 struct ieee80211_hdr *f_hdr;
1202 idx = IEEE80211_FRAGMENT_MAX - 1;
1204 entry = &sdata->fragments[idx];
1205 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1206 entry->rx_queue != rx_queue ||
1207 entry->last_frag + 1 != frag)
1210 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1213 * Check ftype and addresses are equal, else check next fragment
1215 if (((hdr->frame_control ^ f_hdr->frame_control) &
1216 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1217 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1218 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1221 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1222 __skb_queue_purge(&entry->skb_list);
1231 static ieee80211_rx_result debug_noinline
1232 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1234 struct ieee80211_hdr *hdr;
1237 unsigned int frag, seq;
1238 struct ieee80211_fragment_entry *entry;
1239 struct sk_buff *skb;
1241 hdr = (struct ieee80211_hdr *)rx->skb->data;
1242 fc = hdr->frame_control;
1243 sc = le16_to_cpu(hdr->seq_ctrl);
1244 frag = sc & IEEE80211_SCTL_FRAG;
1246 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1247 (rx->skb)->len < 24 ||
1248 is_multicast_ether_addr(hdr->addr1))) {
1249 /* not fragmented */
1252 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1254 if (skb_linearize(rx->skb))
1255 return RX_DROP_UNUSABLE;
1258 * skb_linearize() might change the skb->data and
1259 * previously cached variables (in this case, hdr) need to
1260 * be refreshed with the new data.
1262 hdr = (struct ieee80211_hdr *)rx->skb->data;
1263 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1266 /* This is the first fragment of a new frame. */
1267 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1268 rx->queue, &(rx->skb));
1269 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1270 ieee80211_has_protected(fc)) {
1271 /* Store CCMP PN so that we can verify that the next
1272 * fragment has a sequential PN value. */
1274 memcpy(entry->last_pn,
1275 rx->key->u.ccmp.rx_pn[rx->queue],
1281 /* This is a fragment for a frame that should already be pending in
1282 * fragment cache. Add this fragment to the end of the pending entry.
1284 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1286 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1287 return RX_DROP_MONITOR;
1290 /* Verify that MPDUs within one MSDU have sequential PN values.
1291 * (IEEE 802.11i, 8.3.3.4.5) */
1294 u8 pn[CCMP_PN_LEN], *rpn;
1295 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1296 return RX_DROP_UNUSABLE;
1297 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1298 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1303 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1304 if (memcmp(pn, rpn, CCMP_PN_LEN))
1305 return RX_DROP_UNUSABLE;
1306 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1309 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1310 __skb_queue_tail(&entry->skb_list, rx->skb);
1311 entry->last_frag = frag;
1312 entry->extra_len += rx->skb->len;
1313 if (ieee80211_has_morefrags(fc)) {
1318 rx->skb = __skb_dequeue(&entry->skb_list);
1319 if (skb_tailroom(rx->skb) < entry->extra_len) {
1320 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1321 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1323 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1324 __skb_queue_purge(&entry->skb_list);
1325 return RX_DROP_UNUSABLE;
1328 while ((skb = __skb_dequeue(&entry->skb_list))) {
1329 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1333 /* Complete frame has been reassembled - process it now */
1334 rx->flags |= IEEE80211_RX_FRAGMENTED;
1338 rx->sta->rx_packets++;
1339 if (is_multicast_ether_addr(hdr->addr1))
1340 rx->local->dot11MulticastReceivedFrameCount++;
1342 ieee80211_led_rx(rx->local);
1346 static ieee80211_rx_result debug_noinline
1347 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1349 struct ieee80211_sub_if_data *sdata = rx->sdata;
1350 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1352 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1353 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1356 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1357 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1358 return RX_DROP_UNUSABLE;
1360 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1361 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1363 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1365 /* Free PS Poll skb here instead of returning RX_DROP that would
1366 * count as an dropped frame. */
1367 dev_kfree_skb(rx->skb);
1372 static ieee80211_rx_result debug_noinline
1373 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1375 u8 *data = rx->skb->data;
1376 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1378 if (!ieee80211_is_data_qos(hdr->frame_control))
1381 /* remove the qos control field, update frame type and meta-data */
1382 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1383 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1384 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1385 /* change frame type to non QOS */
1386 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1392 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1394 if (unlikely(!rx->sta ||
1395 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1402 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1404 struct sk_buff *skb = rx->skb;
1405 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1408 * Pass through unencrypted frames if the hardware has
1409 * decrypted them already.
1411 if (status->flag & RX_FLAG_DECRYPTED)
1414 /* Drop unencrypted frames if key is set. */
1415 if (unlikely(!ieee80211_has_protected(fc) &&
1416 !ieee80211_is_nullfunc(fc) &&
1417 ieee80211_is_data(fc) &&
1418 (rx->key || rx->sdata->drop_unencrypted)))
1425 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1427 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1428 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1429 __le16 fc = hdr->frame_control;
1432 * Pass through unencrypted frames if the hardware has
1433 * decrypted them already.
1435 if (status->flag & RX_FLAG_DECRYPTED)
1438 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1439 if (unlikely(!ieee80211_has_protected(fc) &&
1440 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1443 /* BIP does not use Protected field, so need to check MMIE */
1444 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1445 ieee80211_get_mmie_keyidx(rx->skb) < 0))
1448 * When using MFP, Action frames are not allowed prior to
1449 * having configured keys.
1451 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1452 ieee80211_is_robust_mgmt_frame(
1453 (struct ieee80211_hdr *) rx->skb->data)))
1461 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1463 struct ieee80211_sub_if_data *sdata = rx->sdata;
1464 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1466 if (ieee80211_has_a4(hdr->frame_control) &&
1467 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1470 if (is_multicast_ether_addr(hdr->addr1) &&
1471 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1472 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
1475 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1479 * requires that rx->skb is a frame with ethernet header
1481 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1483 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1484 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1485 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1488 * Allow EAPOL frames to us/the PAE group address regardless
1489 * of whether the frame was encrypted or not.
1491 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1492 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1493 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1496 if (ieee80211_802_1x_port_control(rx) ||
1497 ieee80211_drop_unencrypted(rx, fc))
1504 * requires that rx->skb is a frame with ethernet header
1507 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1509 struct ieee80211_sub_if_data *sdata = rx->sdata;
1510 struct net_device *dev = sdata->dev;
1511 struct sk_buff *skb, *xmit_skb;
1512 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1513 struct sta_info *dsta;
1518 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1519 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1520 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1521 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1522 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1523 if (is_multicast_ether_addr(ehdr->h_dest)) {
1525 * send multicast frames both to higher layers in
1526 * local net stack and back to the wireless medium
1528 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1529 if (!xmit_skb && net_ratelimit())
1530 printk(KERN_DEBUG "%s: failed to clone "
1531 "multicast frame\n", dev->name);
1533 dsta = sta_info_get(sdata, skb->data);
1536 * The destination station is associated to
1537 * this AP (in this VLAN), so send the frame
1538 * directly to it and do not pass it to local
1548 int align __maybe_unused;
1550 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1552 * 'align' will only take the values 0 or 2 here
1553 * since all frames are required to be aligned
1554 * to 2-byte boundaries when being passed to
1555 * mac80211. That also explains the __skb_push()
1558 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1560 if (WARN_ON(skb_headroom(skb) < 3)) {
1564 u8 *data = skb->data;
1565 size_t len = skb_headlen(skb);
1567 memmove(skb->data, data, len);
1568 skb_set_tail_pointer(skb, len);
1574 /* deliver to local stack */
1575 skb->protocol = eth_type_trans(skb, dev);
1576 memset(skb->cb, 0, sizeof(skb->cb));
1582 /* send to wireless media */
1583 xmit_skb->protocol = htons(ETH_P_802_3);
1584 skb_reset_network_header(xmit_skb);
1585 skb_reset_mac_header(xmit_skb);
1586 dev_queue_xmit(xmit_skb);
1590 static ieee80211_rx_result debug_noinline
1591 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1593 struct net_device *dev = rx->sdata->dev;
1594 struct sk_buff *skb = rx->skb;
1595 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1596 __le16 fc = hdr->frame_control;
1597 struct sk_buff_head frame_list;
1599 if (unlikely(!ieee80211_is_data(fc)))
1602 if (unlikely(!ieee80211_is_data_present(fc)))
1603 return RX_DROP_MONITOR;
1605 if (!(rx->flags & IEEE80211_RX_AMSDU))
1608 if (ieee80211_has_a4(hdr->frame_control) &&
1609 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1610 !rx->sdata->u.vlan.sta)
1611 return RX_DROP_UNUSABLE;
1613 if (is_multicast_ether_addr(hdr->addr1) &&
1614 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1615 rx->sdata->u.vlan.sta) ||
1616 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1617 rx->sdata->u.mgd.use_4addr)))
1618 return RX_DROP_UNUSABLE;
1621 __skb_queue_head_init(&frame_list);
1623 if (skb_linearize(skb))
1624 return RX_DROP_UNUSABLE;
1626 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1627 rx->sdata->vif.type,
1628 rx->local->hw.extra_tx_headroom);
1630 while (!skb_queue_empty(&frame_list)) {
1631 rx->skb = __skb_dequeue(&frame_list);
1633 if (!ieee80211_frame_allowed(rx, fc)) {
1634 dev_kfree_skb(rx->skb);
1637 dev->stats.rx_packets++;
1638 dev->stats.rx_bytes += rx->skb->len;
1640 ieee80211_deliver_skb(rx);
1646 #ifdef CONFIG_MAC80211_MESH
1647 static ieee80211_rx_result
1648 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1650 struct ieee80211_hdr *hdr;
1651 struct ieee80211s_hdr *mesh_hdr;
1652 unsigned int hdrlen;
1653 struct sk_buff *skb = rx->skb, *fwd_skb;
1654 struct ieee80211_local *local = rx->local;
1655 struct ieee80211_sub_if_data *sdata = rx->sdata;
1657 hdr = (struct ieee80211_hdr *) skb->data;
1658 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1659 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1661 if (!ieee80211_is_data(hdr->frame_control))
1666 return RX_DROP_MONITOR;
1668 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1669 struct mesh_path *mppath;
1673 if (is_multicast_ether_addr(hdr->addr1)) {
1674 mpp_addr = hdr->addr3;
1675 proxied_addr = mesh_hdr->eaddr1;
1677 mpp_addr = hdr->addr4;
1678 proxied_addr = mesh_hdr->eaddr2;
1682 mppath = mpp_path_lookup(proxied_addr, sdata);
1684 mpp_path_add(proxied_addr, mpp_addr, sdata);
1686 spin_lock_bh(&mppath->state_lock);
1687 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1688 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1689 spin_unlock_bh(&mppath->state_lock);
1694 /* Frame has reached destination. Don't forward */
1695 if (!is_multicast_ether_addr(hdr->addr1) &&
1696 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1701 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1703 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1704 dropped_frames_ttl);
1706 struct ieee80211_hdr *fwd_hdr;
1707 struct ieee80211_tx_info *info;
1709 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1711 if (!fwd_skb && net_ratelimit())
1712 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1715 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1716 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1717 info = IEEE80211_SKB_CB(fwd_skb);
1718 memset(info, 0, sizeof(*info));
1719 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1720 info->control.vif = &rx->sdata->vif;
1721 skb_set_queue_mapping(skb,
1722 ieee80211_select_queue(rx->sdata, fwd_skb));
1723 ieee80211_set_qos_hdr(local, skb);
1724 if (is_multicast_ether_addr(fwd_hdr->addr1))
1725 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1730 * Save TA to addr1 to send TA a path error if a
1731 * suitable next hop is not found
1733 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1735 err = mesh_nexthop_lookup(fwd_skb, sdata);
1736 /* Failed to immediately resolve next hop:
1737 * fwded frame was dropped or will be added
1738 * later to the pending skb queue. */
1740 return RX_DROP_MONITOR;
1742 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1745 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1747 ieee80211_add_pending_skb(local, fwd_skb);
1751 if (is_multicast_ether_addr(hdr->addr1) ||
1752 sdata->dev->flags & IFF_PROMISC)
1755 return RX_DROP_MONITOR;
1759 static ieee80211_rx_result debug_noinline
1760 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1762 struct ieee80211_sub_if_data *sdata = rx->sdata;
1763 struct ieee80211_local *local = rx->local;
1764 struct net_device *dev = sdata->dev;
1765 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1766 __le16 fc = hdr->frame_control;
1769 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1772 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1773 return RX_DROP_MONITOR;
1776 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1777 * that a 4-addr station can be detected and moved into a separate VLAN
1779 if (ieee80211_has_a4(hdr->frame_control) &&
1780 sdata->vif.type == NL80211_IFTYPE_AP)
1781 return RX_DROP_MONITOR;
1783 err = __ieee80211_data_to_8023(rx);
1785 return RX_DROP_UNUSABLE;
1787 if (!ieee80211_frame_allowed(rx, fc))
1788 return RX_DROP_MONITOR;
1792 dev->stats.rx_packets++;
1793 dev->stats.rx_bytes += rx->skb->len;
1795 if (ieee80211_is_data(hdr->frame_control) &&
1796 !is_multicast_ether_addr(hdr->addr1) &&
1797 local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1798 mod_timer(&local->dynamic_ps_timer, jiffies +
1799 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1802 ieee80211_deliver_skb(rx);
1807 static ieee80211_rx_result debug_noinline
1808 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
1810 struct ieee80211_local *local = rx->local;
1811 struct ieee80211_hw *hw = &local->hw;
1812 struct sk_buff *skb = rx->skb;
1813 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1814 struct tid_ampdu_rx *tid_agg_rx;
1818 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1821 if (ieee80211_is_back_req(bar->frame_control)) {
1823 __le16 control, start_seq_num;
1824 } __packed bar_data;
1827 return RX_DROP_MONITOR;
1829 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1830 &bar_data, sizeof(bar_data)))
1831 return RX_DROP_MONITOR;
1833 spin_lock(&rx->sta->lock);
1834 tid = le16_to_cpu(bar_data.control) >> 12;
1835 if (!rx->sta->ampdu_mlme.tid_active_rx[tid]) {
1836 spin_unlock(&rx->sta->lock);
1837 return RX_DROP_MONITOR;
1839 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1841 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
1843 /* reset session timer */
1844 if (tid_agg_rx->timeout)
1845 mod_timer(&tid_agg_rx->session_timer,
1846 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1848 /* release stored frames up to start of BAR */
1849 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1852 spin_unlock(&rx->sta->lock);
1857 * After this point, we only want management frames,
1858 * so we can drop all remaining control frames to
1859 * cooked monitor interfaces.
1861 return RX_DROP_MONITOR;
1864 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1865 struct ieee80211_mgmt *mgmt,
1868 struct ieee80211_local *local = sdata->local;
1869 struct sk_buff *skb;
1870 struct ieee80211_mgmt *resp;
1872 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
1873 /* Not to own unicast address */
1877 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1878 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1879 /* Not from the current AP or not associated yet. */
1883 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1884 /* Too short SA Query request frame */
1888 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1892 skb_reserve(skb, local->hw.extra_tx_headroom);
1893 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1894 memset(resp, 0, 24);
1895 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1896 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
1897 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1898 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1899 IEEE80211_STYPE_ACTION);
1900 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1901 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1902 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1903 memcpy(resp->u.action.u.sa_query.trans_id,
1904 mgmt->u.action.u.sa_query.trans_id,
1905 WLAN_SA_QUERY_TR_ID_LEN);
1907 ieee80211_tx_skb(sdata, skb);
1910 static ieee80211_rx_result debug_noinline
1911 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1913 struct ieee80211_local *local = rx->local;
1914 struct ieee80211_sub_if_data *sdata = rx->sdata;
1915 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1916 struct sk_buff *nskb;
1917 struct ieee80211_rx_status *status;
1918 int len = rx->skb->len;
1920 if (!ieee80211_is_action(mgmt->frame_control))
1923 /* drop too small frames */
1924 if (len < IEEE80211_MIN_ACTION_SIZE)
1925 return RX_DROP_UNUSABLE;
1927 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
1928 return RX_DROP_UNUSABLE;
1930 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1931 return RX_DROP_UNUSABLE;
1933 if (ieee80211_drop_unencrypted_mgmt(rx))
1934 return RX_DROP_UNUSABLE;
1936 switch (mgmt->u.action.category) {
1937 case WLAN_CATEGORY_BACK:
1939 * The aggregation code is not prepared to handle
1940 * anything but STA/AP due to the BSSID handling;
1941 * IBSS could work in the code but isn't supported
1942 * by drivers or the standard.
1944 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1945 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1946 sdata->vif.type != NL80211_IFTYPE_AP)
1949 /* verify action_code is present */
1950 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1953 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1954 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1956 switch (mgmt->u.action.u.addba_req.action_code) {
1957 case WLAN_ACTION_ADDBA_REQ:
1958 if (len < (IEEE80211_MIN_ACTION_SIZE +
1959 sizeof(mgmt->u.action.u.addba_req)))
1960 return RX_DROP_MONITOR;
1961 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1963 case WLAN_ACTION_ADDBA_RESP:
1964 if (len < (IEEE80211_MIN_ACTION_SIZE +
1965 sizeof(mgmt->u.action.u.addba_resp)))
1967 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1969 case WLAN_ACTION_DELBA:
1970 if (len < (IEEE80211_MIN_ACTION_SIZE +
1971 sizeof(mgmt->u.action.u.delba)))
1973 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1977 case WLAN_CATEGORY_SPECTRUM_MGMT:
1978 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1981 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1984 /* verify action_code is present */
1985 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1988 switch (mgmt->u.action.u.measurement.action_code) {
1989 case WLAN_ACTION_SPCT_MSR_REQ:
1990 if (len < (IEEE80211_MIN_ACTION_SIZE +
1991 sizeof(mgmt->u.action.u.measurement)))
1993 ieee80211_process_measurement_req(sdata, mgmt, len);
1995 case WLAN_ACTION_SPCT_CHL_SWITCH:
1996 if (len < (IEEE80211_MIN_ACTION_SIZE +
1997 sizeof(mgmt->u.action.u.chan_switch)))
2000 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2003 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2006 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
2009 case WLAN_CATEGORY_SA_QUERY:
2010 if (len < (IEEE80211_MIN_ACTION_SIZE +
2011 sizeof(mgmt->u.action.u.sa_query)))
2014 switch (mgmt->u.action.u.sa_query.action) {
2015 case WLAN_ACTION_SA_QUERY_REQUEST:
2016 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2018 ieee80211_process_sa_query_req(sdata, mgmt, len);
2022 case WLAN_CATEGORY_MESH_PLINK:
2023 case WLAN_CATEGORY_MESH_PATH_SEL:
2024 if (ieee80211_vif_is_mesh(&sdata->vif))
2025 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
2030 * For AP mode, hostapd is responsible for handling any action
2031 * frames that we didn't handle, including returning unknown
2032 * ones. For all other modes we will return them to the sender,
2033 * setting the 0x80 bit in the action category, as required by
2034 * 802.11-2007 7.3.1.11.
2036 if (sdata->vif.type == NL80211_IFTYPE_AP ||
2037 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2038 return RX_DROP_MONITOR;
2041 * Getting here means the kernel doesn't know how to handle
2042 * it, but maybe userspace does ... include returned frames
2043 * so userspace can register for those to know whether ones
2044 * it transmitted were processed or returned.
2046 status = IEEE80211_SKB_RXCB(rx->skb);
2048 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2049 cfg80211_rx_action(rx->sdata->dev, status->freq,
2050 rx->skb->data, rx->skb->len,
2054 /* do not return rejected action frames */
2055 if (mgmt->u.action.category & 0x80)
2056 return RX_DROP_UNUSABLE;
2058 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2061 struct ieee80211_mgmt *mgmt = (void *)nskb->data;
2063 mgmt->u.action.category |= 0x80;
2064 memcpy(mgmt->da, mgmt->sa, ETH_ALEN);
2065 memcpy(mgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2067 memset(nskb->cb, 0, sizeof(nskb->cb));
2069 ieee80211_tx_skb(rx->sdata, nskb);
2074 rx->sta->rx_packets++;
2075 dev_kfree_skb(rx->skb);
2079 static ieee80211_rx_result debug_noinline
2080 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2082 struct ieee80211_sub_if_data *sdata = rx->sdata;
2083 ieee80211_rx_result rxs;
2085 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
2086 return RX_DROP_MONITOR;
2088 if (ieee80211_drop_unencrypted_mgmt(rx))
2089 return RX_DROP_UNUSABLE;
2091 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2092 if (rxs != RX_CONTINUE)
2095 if (ieee80211_vif_is_mesh(&sdata->vif))
2096 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
2098 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2099 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
2101 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2102 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
2104 return RX_DROP_MONITOR;
2107 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
2108 struct ieee80211_rx_data *rx)
2111 unsigned int hdrlen;
2113 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2114 if (rx->skb->len >= hdrlen + 4)
2115 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2121 * Some hardware seem to generate incorrect Michael MIC
2122 * reports; ignore them to avoid triggering countermeasures.
2127 if (!ieee80211_has_protected(hdr->frame_control))
2130 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
2132 * APs with pairwise keys should never receive Michael MIC
2133 * errors for non-zero keyidx because these are reserved for
2134 * group keys and only the AP is sending real multicast
2135 * frames in the BSS.
2140 if (!ieee80211_is_data(hdr->frame_control) &&
2141 !ieee80211_is_auth(hdr->frame_control))
2144 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2148 /* TODO: use IEEE80211_RX_FRAGMENTED */
2149 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2150 struct ieee80211_rate *rate)
2152 struct ieee80211_sub_if_data *sdata;
2153 struct ieee80211_local *local = rx->local;
2154 struct ieee80211_rtap_hdr {
2155 struct ieee80211_radiotap_header hdr;
2160 } __attribute__ ((packed)) *rthdr;
2161 struct sk_buff *skb = rx->skb, *skb2;
2162 struct net_device *prev_dev = NULL;
2163 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2165 if (status->flag & RX_FLAG_INTERNAL_CMTR)
2168 if (skb_headroom(skb) < sizeof(*rthdr) &&
2169 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2172 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2173 memset(rthdr, 0, sizeof(*rthdr));
2174 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2175 rthdr->hdr.it_present =
2176 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2177 (1 << IEEE80211_RADIOTAP_CHANNEL));
2180 rthdr->rate_or_pad = rate->bitrate / 5;
2181 rthdr->hdr.it_present |=
2182 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2184 rthdr->chan_freq = cpu_to_le16(status->freq);
2186 if (status->band == IEEE80211_BAND_5GHZ)
2187 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2188 IEEE80211_CHAN_5GHZ);
2190 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2191 IEEE80211_CHAN_2GHZ);
2193 skb_set_mac_header(skb, 0);
2194 skb->ip_summed = CHECKSUM_UNNECESSARY;
2195 skb->pkt_type = PACKET_OTHERHOST;
2196 skb->protocol = htons(ETH_P_802_2);
2198 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2199 if (!ieee80211_sdata_running(sdata))
2202 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2203 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2207 skb2 = skb_clone(skb, GFP_ATOMIC);
2209 skb2->dev = prev_dev;
2214 prev_dev = sdata->dev;
2215 sdata->dev->stats.rx_packets++;
2216 sdata->dev->stats.rx_bytes += skb->len;
2220 skb->dev = prev_dev;
2226 status->flag |= RX_FLAG_INTERNAL_CMTR;
2234 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
2235 struct ieee80211_rx_data *rx,
2236 struct sk_buff *skb,
2237 struct ieee80211_rate *rate)
2239 struct sk_buff_head reorder_release;
2240 ieee80211_rx_result res = RX_DROP_MONITOR;
2242 __skb_queue_head_init(&reorder_release);
2247 #define CALL_RXH(rxh) \
2250 if (res != RX_CONTINUE) \
2255 * NB: the rxh_next label works even if we jump
2256 * to it from here because then the list will
2257 * be empty, which is a trivial check
2259 CALL_RXH(ieee80211_rx_h_passive_scan)
2260 CALL_RXH(ieee80211_rx_h_check)
2262 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2264 while ((skb = __skb_dequeue(&reorder_release))) {
2266 * all the other fields are valid across frames
2267 * that belong to an aMPDU since they are on the
2268 * same TID from the same station
2272 CALL_RXH(ieee80211_rx_h_decrypt)
2273 CALL_RXH(ieee80211_rx_h_check_more_data)
2274 CALL_RXH(ieee80211_rx_h_sta_process)
2275 CALL_RXH(ieee80211_rx_h_defragment)
2276 CALL_RXH(ieee80211_rx_h_ps_poll)
2277 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2278 /* must be after MMIC verify so header is counted in MPDU mic */
2279 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2280 CALL_RXH(ieee80211_rx_h_amsdu)
2281 #ifdef CONFIG_MAC80211_MESH
2282 if (ieee80211_vif_is_mesh(&sdata->vif))
2283 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2285 CALL_RXH(ieee80211_rx_h_data)
2287 /* special treatment -- needs the queue */
2288 res = ieee80211_rx_h_ctrl(rx, &reorder_release);
2289 if (res != RX_CONTINUE)
2292 CALL_RXH(ieee80211_rx_h_action)
2293 CALL_RXH(ieee80211_rx_h_mgmt)
2299 case RX_DROP_MONITOR:
2300 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2302 rx->sta->rx_dropped++;
2305 ieee80211_rx_cooked_monitor(rx, rate);
2307 case RX_DROP_UNUSABLE:
2308 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2310 rx->sta->rx_dropped++;
2311 dev_kfree_skb(rx->skb);
2314 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2320 /* main receive path */
2322 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2323 struct ieee80211_rx_data *rx,
2324 struct ieee80211_hdr *hdr)
2326 struct sk_buff *skb = rx->skb;
2327 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2328 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2329 int multicast = is_multicast_ether_addr(hdr->addr1);
2331 switch (sdata->vif.type) {
2332 case NL80211_IFTYPE_STATION:
2333 if (!bssid && !sdata->u.mgd.use_4addr)
2336 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2337 if (!(sdata->dev->flags & IFF_PROMISC))
2339 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2342 case NL80211_IFTYPE_ADHOC:
2345 if (ieee80211_is_beacon(hdr->frame_control)) {
2348 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2349 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2351 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2352 } else if (!multicast &&
2353 compare_ether_addr(sdata->vif.addr,
2355 if (!(sdata->dev->flags & IFF_PROMISC))
2357 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2358 } else if (!rx->sta) {
2360 if (status->flag & RX_FLAG_HT)
2361 rate_idx = 0; /* TODO: HT rates */
2363 rate_idx = status->rate_idx;
2364 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2365 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2368 case NL80211_IFTYPE_MESH_POINT:
2370 compare_ether_addr(sdata->vif.addr,
2372 if (!(sdata->dev->flags & IFF_PROMISC))
2375 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2378 case NL80211_IFTYPE_AP_VLAN:
2379 case NL80211_IFTYPE_AP:
2381 if (compare_ether_addr(sdata->vif.addr,
2384 } else if (!ieee80211_bssid_match(bssid,
2386 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2388 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2391 case NL80211_IFTYPE_WDS:
2392 if (bssid || !ieee80211_is_data(hdr->frame_control))
2394 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2397 case NL80211_IFTYPE_MONITOR:
2398 case NL80211_IFTYPE_UNSPECIFIED:
2399 case __NL80211_IFTYPE_AFTER_LAST:
2400 /* should never get here */
2409 * This is the actual Rx frames handler. as it blongs to Rx path it must
2410 * be called with rcu_read_lock protection.
2412 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2413 struct sk_buff *skb,
2414 struct ieee80211_rate *rate)
2416 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2417 struct ieee80211_local *local = hw_to_local(hw);
2418 struct ieee80211_sub_if_data *sdata;
2419 struct ieee80211_hdr *hdr;
2421 struct ieee80211_rx_data rx;
2423 struct ieee80211_sub_if_data *prev = NULL;
2424 struct sk_buff *skb_new;
2425 struct sta_info *sta, *tmp;
2426 bool found_sta = false;
2429 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2430 memset(&rx, 0, sizeof(rx));
2434 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2435 local->dot11ReceivedFragmentCount++;
2437 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2438 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2439 rx.flags |= IEEE80211_RX_IN_SCAN;
2441 if (ieee80211_is_mgmt(fc))
2442 err = skb_linearize(skb);
2444 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2451 hdr = (struct ieee80211_hdr *)skb->data;
2452 ieee80211_parse_qos(&rx);
2453 ieee80211_verify_alignment(&rx);
2455 if (ieee80211_is_data(fc)) {
2456 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2459 rx.sdata = sta->sdata;
2461 rx.flags |= IEEE80211_RX_RA_MATCH;
2462 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2464 if (status->flag & RX_FLAG_MMIC_ERROR) {
2465 if (rx.flags & IEEE80211_RX_RA_MATCH)
2466 ieee80211_rx_michael_mic_report(hdr, &rx);
2473 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2474 if (!ieee80211_sdata_running(sdata))
2477 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2478 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2482 * frame is destined for this interface, but if it's
2483 * not also for the previous one we handle that after
2484 * the loop to avoid copying the SKB once too much
2492 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2494 rx.flags |= IEEE80211_RX_RA_MATCH;
2495 prepares = prepare_for_handlers(prev, &rx, hdr);
2500 if (status->flag & RX_FLAG_MMIC_ERROR) {
2502 if (rx.flags & IEEE80211_RX_RA_MATCH)
2503 ieee80211_rx_michael_mic_report(hdr,
2509 * frame was destined for the previous interface
2510 * so invoke RX handlers for it
2513 skb_new = skb_copy(skb, GFP_ATOMIC);
2515 if (net_ratelimit())
2516 printk(KERN_DEBUG "%s: failed to copy "
2517 "multicast frame for %s\n",
2518 wiphy_name(local->hw.wiphy),
2522 ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate);
2528 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2530 rx.flags |= IEEE80211_RX_RA_MATCH;
2531 prepares = prepare_for_handlers(prev, &rx, hdr);
2538 ieee80211_invoke_rx_handlers(prev, &rx, skb, rate);
2544 * This is the receive path handler. It is called by a low level driver when an
2545 * 802.11 MPDU is received from the hardware.
2547 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2549 struct ieee80211_local *local = hw_to_local(hw);
2550 struct ieee80211_rate *rate = NULL;
2551 struct ieee80211_supported_band *sband;
2552 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2554 WARN_ON_ONCE(softirq_count() == 0);
2556 if (WARN_ON(status->band < 0 ||
2557 status->band >= IEEE80211_NUM_BANDS))
2560 sband = local->hw.wiphy->bands[status->band];
2561 if (WARN_ON(!sband))
2565 * If we're suspending, it is possible although not too likely
2566 * that we'd be receiving frames after having already partially
2567 * quiesced the stack. We can't process such frames then since
2568 * that might, for example, cause stations to be added or other
2569 * driver callbacks be invoked.
2571 if (unlikely(local->quiescing || local->suspended))
2575 * The same happens when we're not even started,
2576 * but that's worth a warning.
2578 if (WARN_ON(!local->started))
2581 if (status->flag & RX_FLAG_HT) {
2583 * rate_idx is MCS index, which can be [0-76] as documented on:
2585 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2587 * Anything else would be some sort of driver or hardware error.
2588 * The driver should catch hardware errors.
2590 if (WARN((status->rate_idx < 0 ||
2591 status->rate_idx > 76),
2592 "Rate marked as an HT rate but passed "
2593 "status->rate_idx is not "
2594 "an MCS index [0-76]: %d (0x%02x)\n",
2599 if (WARN_ON(status->rate_idx < 0 ||
2600 status->rate_idx >= sband->n_bitrates))
2602 rate = &sband->bitrates[status->rate_idx];
2606 * key references and virtual interfaces are protected using RCU
2607 * and this requires that we are in a read-side RCU section during
2608 * receive processing
2613 * Frames with failed FCS/PLCP checksum are not returned,
2614 * all other frames are returned without radiotap header
2615 * if it was previously present.
2616 * Also, frames with less than 16 bytes are dropped.
2618 skb = ieee80211_rx_monitor(local, skb, rate);
2624 __ieee80211_rx_handle_packet(hw, skb, rate);
2632 EXPORT_SYMBOL(ieee80211_rx);
2634 /* This is a version of the rx handler that can be called from hard irq
2635 * context. Post the skb on the queue and schedule the tasklet */
2636 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2638 struct ieee80211_local *local = hw_to_local(hw);
2640 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2642 skb->pkt_type = IEEE80211_RX_MSG;
2643 skb_queue_tail(&local->skb_queue, skb);
2644 tasklet_schedule(&local->tasklet);
2646 EXPORT_SYMBOL(ieee80211_rx_irqsafe);