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;
296 netif_receive_skb(skb2);
300 prev_dev = sdata->dev;
301 sdata->dev->stats.rx_packets++;
302 sdata->dev->stats.rx_bytes += skb->len;
307 netif_receive_skb(skb);
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 sk_buff *skb = tid_agg_rx->reorder_buf[index];
546 /* release the frame from the reorder ring buffer */
547 tid_agg_rx->stored_mpdu_num--;
548 tid_agg_rx->reorder_buf[index] = NULL;
549 __skb_queue_tail(frames, skb);
552 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
555 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
556 struct tid_ampdu_rx *tid_agg_rx,
558 struct sk_buff_head *frames)
562 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
563 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
564 tid_agg_rx->buf_size;
565 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
570 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
571 * the skb was added to the buffer longer than this time ago, the earlier
572 * frames that have not yet been received are assumed to be lost and the skb
573 * can be released for processing. This may also release other skb's from the
574 * reorder buffer if there are no additional gaps between the frames.
576 * Callers must hold tid_agg_rx->reorder_lock.
578 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
580 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
581 struct tid_ampdu_rx *tid_agg_rx,
582 struct sk_buff_head *frames)
586 /* release the buffer until next missing frame */
587 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
588 tid_agg_rx->buf_size;
589 if (!tid_agg_rx->reorder_buf[index] &&
590 tid_agg_rx->stored_mpdu_num > 1) {
592 * No buffers ready to be released, but check whether any
593 * frames in the reorder buffer have timed out.
596 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
597 j = (j + 1) % tid_agg_rx->buf_size) {
598 if (!tid_agg_rx->reorder_buf[j]) {
602 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
603 HT_RX_REORDER_BUF_TIMEOUT))
604 goto set_release_timer;
606 #ifdef CONFIG_MAC80211_HT_DEBUG
608 wiphy_debug(hw->wiphy,
609 "release an RX reorder frame due to timeout on earlier frames\n");
611 ieee80211_release_reorder_frame(hw, tid_agg_rx,
615 * Increment the head seq# also for the skipped slots.
617 tid_agg_rx->head_seq_num =
618 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
621 } else while (tid_agg_rx->reorder_buf[index]) {
622 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
623 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
624 tid_agg_rx->buf_size;
627 if (tid_agg_rx->stored_mpdu_num) {
628 j = index = seq_sub(tid_agg_rx->head_seq_num,
629 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
631 for (; j != (index - 1) % tid_agg_rx->buf_size;
632 j = (j + 1) % tid_agg_rx->buf_size) {
633 if (tid_agg_rx->reorder_buf[j])
639 mod_timer(&tid_agg_rx->reorder_timer,
640 tid_agg_rx->reorder_time[j] +
641 HT_RX_REORDER_BUF_TIMEOUT);
643 del_timer(&tid_agg_rx->reorder_timer);
648 * As this function belongs to the RX path it must be under
649 * rcu_read_lock protection. It returns false if the frame
650 * can be processed immediately, true if it was consumed.
652 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
653 struct tid_ampdu_rx *tid_agg_rx,
655 struct sk_buff_head *frames)
657 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
658 u16 sc = le16_to_cpu(hdr->seq_ctrl);
659 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
660 u16 head_seq_num, buf_size;
664 buf_size = tid_agg_rx->buf_size;
665 head_seq_num = tid_agg_rx->head_seq_num;
667 spin_lock(&tid_agg_rx->reorder_lock);
668 /* frame with out of date sequence number */
669 if (seq_less(mpdu_seq_num, head_seq_num)) {
675 * If frame the sequence number exceeds our buffering window
676 * size release some previous frames to make room for this one.
678 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
679 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
680 /* release stored frames up to new head to stack */
681 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
685 /* Now the new frame is always in the range of the reordering buffer */
687 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
689 /* check if we already stored this frame */
690 if (tid_agg_rx->reorder_buf[index]) {
696 * If the current MPDU is in the right order and nothing else
697 * is stored we can process it directly, no need to buffer it.
699 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
700 tid_agg_rx->stored_mpdu_num == 0) {
701 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
706 /* put the frame in the reordering buffer */
707 tid_agg_rx->reorder_buf[index] = skb;
708 tid_agg_rx->reorder_time[index] = jiffies;
709 tid_agg_rx->stored_mpdu_num++;
710 ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
713 spin_unlock(&tid_agg_rx->reorder_lock);
718 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
719 * true if the MPDU was buffered, false if it should be processed.
721 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
722 struct sk_buff_head *frames)
724 struct sk_buff *skb = rx->skb;
725 struct ieee80211_local *local = rx->local;
726 struct ieee80211_hw *hw = &local->hw;
727 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
728 struct sta_info *sta = rx->sta;
729 struct tid_ampdu_rx *tid_agg_rx;
733 if (!ieee80211_is_data_qos(hdr->frame_control))
737 * filter the QoS data rx stream according to
738 * STA/TID and check if this STA/TID is on aggregation
744 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
746 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
750 /* qos null data frames are excluded */
751 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
754 /* new, potentially un-ordered, ampdu frame - process it */
756 /* reset session timer */
757 if (tid_agg_rx->timeout)
758 mod_timer(&tid_agg_rx->session_timer,
759 TU_TO_EXP_TIME(tid_agg_rx->timeout));
761 /* if this mpdu is fragmented - terminate rx aggregation session */
762 sc = le16_to_cpu(hdr->seq_ctrl);
763 if (sc & IEEE80211_SCTL_FRAG) {
764 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
765 skb_queue_tail(&rx->sdata->skb_queue, skb);
766 ieee80211_queue_work(&local->hw, &rx->sdata->work);
771 * No locking needed -- we will only ever process one
772 * RX packet at a time, and thus own tid_agg_rx. All
773 * other code manipulating it needs to (and does) make
774 * sure that we cannot get to it any more before doing
777 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
781 __skb_queue_tail(frames, skb);
784 static ieee80211_rx_result debug_noinline
785 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
787 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
789 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
790 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
791 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
792 rx->sta->last_seq_ctrl[rx->queue] ==
794 if (rx->flags & IEEE80211_RX_RA_MATCH) {
795 rx->local->dot11FrameDuplicateCount++;
796 rx->sta->num_duplicates++;
798 return RX_DROP_MONITOR;
800 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
803 if (unlikely(rx->skb->len < 16)) {
804 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
805 return RX_DROP_MONITOR;
808 /* Drop disallowed frame classes based on STA auth/assoc state;
809 * IEEE 802.11, Chap 5.5.
811 * mac80211 filters only based on association state, i.e. it drops
812 * Class 3 frames from not associated stations. hostapd sends
813 * deauth/disassoc frames when needed. In addition, hostapd is
814 * responsible for filtering on both auth and assoc states.
817 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
818 return ieee80211_rx_mesh_check(rx);
820 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
821 ieee80211_is_pspoll(hdr->frame_control)) &&
822 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
823 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
824 if ((!ieee80211_has_fromds(hdr->frame_control) &&
825 !ieee80211_has_tods(hdr->frame_control) &&
826 ieee80211_is_data(hdr->frame_control)) ||
827 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
828 /* Drop IBSS frames and frames for other hosts
830 return RX_DROP_MONITOR;
833 return RX_DROP_MONITOR;
840 static ieee80211_rx_result debug_noinline
841 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
843 struct sk_buff *skb = rx->skb;
844 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
845 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
848 ieee80211_rx_result result = RX_DROP_UNUSABLE;
849 struct ieee80211_key *stakey = NULL;
850 int mmie_keyidx = -1;
856 * There are four types of keys:
858 * - IGTK (group keys for management frames)
859 * - PTK (pairwise keys)
860 * - STK (station-to-station pairwise keys)
862 * When selecting a key, we have to distinguish between multicast
863 * (including broadcast) and unicast frames, the latter can only
864 * use PTKs and STKs while the former always use GTKs and IGTKs.
865 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
866 * unicast frames can also use key indices like GTKs. Hence, if we
867 * don't have a PTK/STK we check the key index for a WEP key.
869 * Note that in a regular BSS, multicast frames are sent by the
870 * AP only, associated stations unicast the frame to the AP first
871 * which then multicasts it on their behalf.
873 * There is also a slight problem in IBSS mode: GTKs are negotiated
874 * with each station, that is something we don't currently handle.
875 * The spec seems to expect that one negotiates the same key with
876 * every station but there's no such requirement; VLANs could be
881 * No point in finding a key and decrypting if the frame is neither
882 * addressed to us nor a multicast frame.
884 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
887 /* start without a key */
891 stakey = rcu_dereference(rx->sta->key);
893 fc = hdr->frame_control;
895 if (!ieee80211_has_protected(fc))
896 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
898 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
900 if ((status->flag & RX_FLAG_DECRYPTED) &&
901 (status->flag & RX_FLAG_IV_STRIPPED))
903 /* Skip decryption if the frame is not protected. */
904 if (!ieee80211_has_protected(fc))
906 } else if (mmie_keyidx >= 0) {
907 /* Broadcast/multicast robust management frame / BIP */
908 if ((status->flag & RX_FLAG_DECRYPTED) &&
909 (status->flag & RX_FLAG_IV_STRIPPED))
912 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
913 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
914 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
915 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
916 } else if (!ieee80211_has_protected(fc)) {
918 * The frame was not protected, so skip decryption. However, we
919 * need to set rx->key if there is a key that could have been
920 * used so that the frame may be dropped if encryption would
921 * have been expected.
923 struct ieee80211_key *key = NULL;
924 if (ieee80211_is_mgmt(fc) &&
925 is_multicast_ether_addr(hdr->addr1) &&
926 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
928 else if ((key = rcu_dereference(rx->sdata->default_key)))
934 * The device doesn't give us the IV so we won't be
935 * able to look up the key. That's ok though, we
936 * don't need to decrypt the frame, we just won't
937 * be able to keep statistics accurate.
938 * Except for key threshold notifications, should
939 * we somehow allow the driver to tell us which key
940 * the hardware used if this flag is set?
942 if ((status->flag & RX_FLAG_DECRYPTED) &&
943 (status->flag & RX_FLAG_IV_STRIPPED))
946 hdrlen = ieee80211_hdrlen(fc);
948 if (rx->skb->len < 8 + hdrlen)
949 return RX_DROP_UNUSABLE; /* TODO: count this? */
952 * no need to call ieee80211_wep_get_keyidx,
953 * it verifies a bunch of things we've done already
955 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
958 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
961 * RSNA-protected unicast frames should always be sent with
962 * pairwise or station-to-station keys, but for WEP we allow
963 * using a key index as well.
965 if (rx->key && rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
966 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
967 !is_multicast_ether_addr(hdr->addr1))
972 rx->key->tx_rx_count++;
973 /* TODO: add threshold stuff again */
975 return RX_DROP_MONITOR;
978 if (skb_linearize(rx->skb))
979 return RX_DROP_UNUSABLE;
980 /* the hdr variable is invalid now! */
982 switch (rx->key->conf.cipher) {
983 case WLAN_CIPHER_SUITE_WEP40:
984 case WLAN_CIPHER_SUITE_WEP104:
985 /* Check for weak IVs if possible */
986 if (rx->sta && ieee80211_is_data(fc) &&
987 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
988 !(status->flag & RX_FLAG_DECRYPTED)) &&
989 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
990 rx->sta->wep_weak_iv_count++;
992 result = ieee80211_crypto_wep_decrypt(rx);
994 case WLAN_CIPHER_SUITE_TKIP:
995 result = ieee80211_crypto_tkip_decrypt(rx);
997 case WLAN_CIPHER_SUITE_CCMP:
998 result = ieee80211_crypto_ccmp_decrypt(rx);
1000 case WLAN_CIPHER_SUITE_AES_CMAC:
1001 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1005 * We can reach here only with HW-only algorithms
1006 * but why didn't it decrypt the frame?!
1008 return RX_DROP_UNUSABLE;
1011 /* either the frame has been decrypted or will be dropped */
1012 status->flag |= RX_FLAG_DECRYPTED;
1017 static ieee80211_rx_result debug_noinline
1018 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1020 struct ieee80211_local *local;
1021 struct ieee80211_hdr *hdr;
1022 struct sk_buff *skb;
1026 hdr = (struct ieee80211_hdr *) skb->data;
1028 if (!local->pspolling)
1031 if (!ieee80211_has_fromds(hdr->frame_control))
1032 /* this is not from AP */
1035 if (!ieee80211_is_data(hdr->frame_control))
1038 if (!ieee80211_has_moredata(hdr->frame_control)) {
1039 /* AP has no more frames buffered for us */
1040 local->pspolling = false;
1044 /* more data bit is set, let's request a new frame from the AP */
1045 ieee80211_send_pspoll(local, rx->sdata);
1050 static void ap_sta_ps_start(struct sta_info *sta)
1052 struct ieee80211_sub_if_data *sdata = sta->sdata;
1053 struct ieee80211_local *local = sdata->local;
1055 atomic_inc(&sdata->bss->num_sta_ps);
1056 set_sta_flags(sta, WLAN_STA_PS_STA);
1057 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1058 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1059 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1060 sdata->name, sta->sta.addr, sta->sta.aid);
1061 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1064 static void ap_sta_ps_end(struct sta_info *sta)
1066 struct ieee80211_sub_if_data *sdata = sta->sdata;
1068 atomic_dec(&sdata->bss->num_sta_ps);
1070 clear_sta_flags(sta, WLAN_STA_PS_STA);
1072 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1073 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1074 sdata->name, sta->sta.addr, sta->sta.aid);
1075 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1077 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
1078 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1079 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1080 sdata->name, sta->sta.addr, sta->sta.aid);
1081 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1085 ieee80211_sta_ps_deliver_wakeup(sta);
1088 static ieee80211_rx_result debug_noinline
1089 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1091 struct sta_info *sta = rx->sta;
1092 struct sk_buff *skb = rx->skb;
1093 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1094 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1100 * Update last_rx only for IBSS packets which are for the current
1101 * BSSID to avoid keeping the current IBSS network alive in cases
1102 * where other STAs start using different BSSID.
1104 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1105 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1106 NL80211_IFTYPE_ADHOC);
1107 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
1108 sta->last_rx = jiffies;
1109 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1111 * Mesh beacons will update last_rx when if they are found to
1112 * match the current local configuration when processed.
1114 sta->last_rx = jiffies;
1117 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1120 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1121 ieee80211_sta_rx_notify(rx->sdata, hdr);
1123 sta->rx_fragments++;
1124 sta->rx_bytes += rx->skb->len;
1125 sta->last_signal = status->signal;
1128 * Change STA power saving mode only at the end of a frame
1129 * exchange sequence.
1131 if (!ieee80211_has_morefrags(hdr->frame_control) &&
1132 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1133 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1134 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
1136 * Ignore doze->wake transitions that are
1137 * indicated by non-data frames, the standard
1138 * is unclear here, but for example going to
1139 * PS mode and then scanning would cause a
1140 * doze->wake transition for the probe request,
1141 * and that is clearly undesirable.
1143 if (ieee80211_is_data(hdr->frame_control) &&
1144 !ieee80211_has_pm(hdr->frame_control))
1147 if (ieee80211_has_pm(hdr->frame_control))
1148 ap_sta_ps_start(sta);
1153 * Drop (qos-)data::nullfunc frames silently, since they
1154 * are used only to control station power saving mode.
1156 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1157 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1158 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1161 * If we receive a 4-addr nullfunc frame from a STA
1162 * that was not moved to a 4-addr STA vlan yet, drop
1163 * the frame to the monitor interface, to make sure
1164 * that hostapd sees it
1166 if (ieee80211_has_a4(hdr->frame_control) &&
1167 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1168 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1169 !rx->sdata->u.vlan.sta)))
1170 return RX_DROP_MONITOR;
1172 * Update counter and free packet here to avoid
1173 * counting this as a dropped packed.
1176 dev_kfree_skb(rx->skb);
1181 } /* ieee80211_rx_h_sta_process */
1183 static inline struct ieee80211_fragment_entry *
1184 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1185 unsigned int frag, unsigned int seq, int rx_queue,
1186 struct sk_buff **skb)
1188 struct ieee80211_fragment_entry *entry;
1191 idx = sdata->fragment_next;
1192 entry = &sdata->fragments[sdata->fragment_next++];
1193 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1194 sdata->fragment_next = 0;
1196 if (!skb_queue_empty(&entry->skb_list)) {
1197 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1198 struct ieee80211_hdr *hdr =
1199 (struct ieee80211_hdr *) entry->skb_list.next->data;
1200 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1201 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1202 "addr1=%pM addr2=%pM\n",
1204 jiffies - entry->first_frag_time, entry->seq,
1205 entry->last_frag, hdr->addr1, hdr->addr2);
1207 __skb_queue_purge(&entry->skb_list);
1210 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1212 entry->first_frag_time = jiffies;
1214 entry->rx_queue = rx_queue;
1215 entry->last_frag = frag;
1217 entry->extra_len = 0;
1222 static inline struct ieee80211_fragment_entry *
1223 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1224 unsigned int frag, unsigned int seq,
1225 int rx_queue, struct ieee80211_hdr *hdr)
1227 struct ieee80211_fragment_entry *entry;
1230 idx = sdata->fragment_next;
1231 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1232 struct ieee80211_hdr *f_hdr;
1236 idx = IEEE80211_FRAGMENT_MAX - 1;
1238 entry = &sdata->fragments[idx];
1239 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1240 entry->rx_queue != rx_queue ||
1241 entry->last_frag + 1 != frag)
1244 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1247 * Check ftype and addresses are equal, else check next fragment
1249 if (((hdr->frame_control ^ f_hdr->frame_control) &
1250 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1251 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1252 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1255 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1256 __skb_queue_purge(&entry->skb_list);
1265 static ieee80211_rx_result debug_noinline
1266 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1268 struct ieee80211_hdr *hdr;
1271 unsigned int frag, seq;
1272 struct ieee80211_fragment_entry *entry;
1273 struct sk_buff *skb;
1275 hdr = (struct ieee80211_hdr *)rx->skb->data;
1276 fc = hdr->frame_control;
1277 sc = le16_to_cpu(hdr->seq_ctrl);
1278 frag = sc & IEEE80211_SCTL_FRAG;
1280 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1281 (rx->skb)->len < 24 ||
1282 is_multicast_ether_addr(hdr->addr1))) {
1283 /* not fragmented */
1286 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1288 if (skb_linearize(rx->skb))
1289 return RX_DROP_UNUSABLE;
1292 * skb_linearize() might change the skb->data and
1293 * previously cached variables (in this case, hdr) need to
1294 * be refreshed with the new data.
1296 hdr = (struct ieee80211_hdr *)rx->skb->data;
1297 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1300 /* This is the first fragment of a new frame. */
1301 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1302 rx->queue, &(rx->skb));
1303 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1304 ieee80211_has_protected(fc)) {
1305 int queue = ieee80211_is_mgmt(fc) ?
1306 NUM_RX_DATA_QUEUES : rx->queue;
1307 /* Store CCMP PN so that we can verify that the next
1308 * fragment has a sequential PN value. */
1310 memcpy(entry->last_pn,
1311 rx->key->u.ccmp.rx_pn[queue],
1317 /* This is a fragment for a frame that should already be pending in
1318 * fragment cache. Add this fragment to the end of the pending entry.
1320 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1322 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1323 return RX_DROP_MONITOR;
1326 /* Verify that MPDUs within one MSDU have sequential PN values.
1327 * (IEEE 802.11i, 8.3.3.4.5) */
1330 u8 pn[CCMP_PN_LEN], *rpn;
1332 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1333 return RX_DROP_UNUSABLE;
1334 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1335 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1340 queue = ieee80211_is_mgmt(fc) ?
1341 NUM_RX_DATA_QUEUES : rx->queue;
1342 rpn = rx->key->u.ccmp.rx_pn[queue];
1343 if (memcmp(pn, rpn, CCMP_PN_LEN))
1344 return RX_DROP_UNUSABLE;
1345 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1348 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1349 __skb_queue_tail(&entry->skb_list, rx->skb);
1350 entry->last_frag = frag;
1351 entry->extra_len += rx->skb->len;
1352 if (ieee80211_has_morefrags(fc)) {
1357 rx->skb = __skb_dequeue(&entry->skb_list);
1358 if (skb_tailroom(rx->skb) < entry->extra_len) {
1359 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1360 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1362 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1363 __skb_queue_purge(&entry->skb_list);
1364 return RX_DROP_UNUSABLE;
1367 while ((skb = __skb_dequeue(&entry->skb_list))) {
1368 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1372 /* Complete frame has been reassembled - process it now */
1373 rx->flags |= IEEE80211_RX_FRAGMENTED;
1377 rx->sta->rx_packets++;
1378 if (is_multicast_ether_addr(hdr->addr1))
1379 rx->local->dot11MulticastReceivedFrameCount++;
1381 ieee80211_led_rx(rx->local);
1385 static ieee80211_rx_result debug_noinline
1386 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1388 struct ieee80211_sub_if_data *sdata = rx->sdata;
1389 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1391 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1392 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1395 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1396 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1397 return RX_DROP_UNUSABLE;
1399 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1400 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1402 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1404 /* Free PS Poll skb here instead of returning RX_DROP that would
1405 * count as an dropped frame. */
1406 dev_kfree_skb(rx->skb);
1411 static ieee80211_rx_result debug_noinline
1412 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1414 u8 *data = rx->skb->data;
1415 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1417 if (!ieee80211_is_data_qos(hdr->frame_control))
1420 /* remove the qos control field, update frame type and meta-data */
1421 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1422 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1423 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1424 /* change frame type to non QOS */
1425 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1431 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1433 if (unlikely(!rx->sta ||
1434 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1441 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1443 struct sk_buff *skb = rx->skb;
1444 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1447 * Pass through unencrypted frames if the hardware has
1448 * decrypted them already.
1450 if (status->flag & RX_FLAG_DECRYPTED)
1453 /* Drop unencrypted frames if key is set. */
1454 if (unlikely(!ieee80211_has_protected(fc) &&
1455 !ieee80211_is_nullfunc(fc) &&
1456 ieee80211_is_data(fc) &&
1457 (rx->key || rx->sdata->drop_unencrypted)))
1464 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1466 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1467 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1468 __le16 fc = hdr->frame_control;
1471 * Pass through unencrypted frames if the hardware has
1472 * decrypted them already.
1474 if (status->flag & RX_FLAG_DECRYPTED)
1477 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1478 if (unlikely(!ieee80211_has_protected(fc) &&
1479 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1482 /* BIP does not use Protected field, so need to check MMIE */
1483 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1484 ieee80211_get_mmie_keyidx(rx->skb) < 0))
1487 * When using MFP, Action frames are not allowed prior to
1488 * having configured keys.
1490 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1491 ieee80211_is_robust_mgmt_frame(
1492 (struct ieee80211_hdr *) rx->skb->data)))
1500 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1502 struct ieee80211_sub_if_data *sdata = rx->sdata;
1503 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1505 if (ieee80211_has_a4(hdr->frame_control) &&
1506 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1509 if (is_multicast_ether_addr(hdr->addr1) &&
1510 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1511 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
1514 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1518 * requires that rx->skb is a frame with ethernet header
1520 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1522 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1523 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1524 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1527 * Allow EAPOL frames to us/the PAE group address regardless
1528 * of whether the frame was encrypted or not.
1530 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1531 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1532 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1535 if (ieee80211_802_1x_port_control(rx) ||
1536 ieee80211_drop_unencrypted(rx, fc))
1543 * requires that rx->skb is a frame with ethernet header
1546 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1548 struct ieee80211_sub_if_data *sdata = rx->sdata;
1549 struct net_device *dev = sdata->dev;
1550 struct sk_buff *skb, *xmit_skb;
1551 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1552 struct sta_info *dsta;
1557 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1558 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1559 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1560 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1561 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1562 if (is_multicast_ether_addr(ehdr->h_dest)) {
1564 * send multicast frames both to higher layers in
1565 * local net stack and back to the wireless medium
1567 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1568 if (!xmit_skb && net_ratelimit())
1569 printk(KERN_DEBUG "%s: failed to clone "
1570 "multicast frame\n", dev->name);
1572 dsta = sta_info_get(sdata, skb->data);
1575 * The destination station is associated to
1576 * this AP (in this VLAN), so send the frame
1577 * directly to it and do not pass it to local
1587 int align __maybe_unused;
1589 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1591 * 'align' will only take the values 0 or 2 here
1592 * since all frames are required to be aligned
1593 * to 2-byte boundaries when being passed to
1594 * mac80211. That also explains the __skb_push()
1597 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1599 if (WARN_ON(skb_headroom(skb) < 3)) {
1603 u8 *data = skb->data;
1604 size_t len = skb_headlen(skb);
1606 memmove(skb->data, data, len);
1607 skb_set_tail_pointer(skb, len);
1613 /* deliver to local stack */
1614 skb->protocol = eth_type_trans(skb, dev);
1615 memset(skb->cb, 0, sizeof(skb->cb));
1616 netif_receive_skb(skb);
1621 /* send to wireless media */
1622 xmit_skb->protocol = htons(ETH_P_802_3);
1623 skb_reset_network_header(xmit_skb);
1624 skb_reset_mac_header(xmit_skb);
1625 dev_queue_xmit(xmit_skb);
1629 static ieee80211_rx_result debug_noinline
1630 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1632 struct net_device *dev = rx->sdata->dev;
1633 struct sk_buff *skb = rx->skb;
1634 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1635 __le16 fc = hdr->frame_control;
1636 struct sk_buff_head frame_list;
1638 if (unlikely(!ieee80211_is_data(fc)))
1641 if (unlikely(!ieee80211_is_data_present(fc)))
1642 return RX_DROP_MONITOR;
1644 if (!(rx->flags & IEEE80211_RX_AMSDU))
1647 if (ieee80211_has_a4(hdr->frame_control) &&
1648 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1649 !rx->sdata->u.vlan.sta)
1650 return RX_DROP_UNUSABLE;
1652 if (is_multicast_ether_addr(hdr->addr1) &&
1653 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1654 rx->sdata->u.vlan.sta) ||
1655 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1656 rx->sdata->u.mgd.use_4addr)))
1657 return RX_DROP_UNUSABLE;
1660 __skb_queue_head_init(&frame_list);
1662 if (skb_linearize(skb))
1663 return RX_DROP_UNUSABLE;
1665 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1666 rx->sdata->vif.type,
1667 rx->local->hw.extra_tx_headroom);
1669 while (!skb_queue_empty(&frame_list)) {
1670 rx->skb = __skb_dequeue(&frame_list);
1672 if (!ieee80211_frame_allowed(rx, fc)) {
1673 dev_kfree_skb(rx->skb);
1676 dev->stats.rx_packets++;
1677 dev->stats.rx_bytes += rx->skb->len;
1679 ieee80211_deliver_skb(rx);
1685 #ifdef CONFIG_MAC80211_MESH
1686 static ieee80211_rx_result
1687 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1689 struct ieee80211_hdr *hdr;
1690 struct ieee80211s_hdr *mesh_hdr;
1691 unsigned int hdrlen;
1692 struct sk_buff *skb = rx->skb, *fwd_skb;
1693 struct ieee80211_local *local = rx->local;
1694 struct ieee80211_sub_if_data *sdata = rx->sdata;
1696 hdr = (struct ieee80211_hdr *) skb->data;
1697 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1698 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1700 if (!ieee80211_is_data(hdr->frame_control))
1705 return RX_DROP_MONITOR;
1707 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1708 struct mesh_path *mppath;
1712 if (is_multicast_ether_addr(hdr->addr1)) {
1713 mpp_addr = hdr->addr3;
1714 proxied_addr = mesh_hdr->eaddr1;
1716 mpp_addr = hdr->addr4;
1717 proxied_addr = mesh_hdr->eaddr2;
1721 mppath = mpp_path_lookup(proxied_addr, sdata);
1723 mpp_path_add(proxied_addr, mpp_addr, sdata);
1725 spin_lock_bh(&mppath->state_lock);
1726 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1727 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1728 spin_unlock_bh(&mppath->state_lock);
1733 /* Frame has reached destination. Don't forward */
1734 if (!is_multicast_ether_addr(hdr->addr1) &&
1735 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1740 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1742 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1743 dropped_frames_ttl);
1745 struct ieee80211_hdr *fwd_hdr;
1746 struct ieee80211_tx_info *info;
1748 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1750 if (!fwd_skb && net_ratelimit())
1751 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1754 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1755 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1756 info = IEEE80211_SKB_CB(fwd_skb);
1757 memset(info, 0, sizeof(*info));
1758 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1759 info->control.vif = &rx->sdata->vif;
1760 skb_set_queue_mapping(skb,
1761 ieee80211_select_queue(rx->sdata, fwd_skb));
1762 ieee80211_set_qos_hdr(local, skb);
1763 if (is_multicast_ether_addr(fwd_hdr->addr1))
1764 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1769 * Save TA to addr1 to send TA a path error if a
1770 * suitable next hop is not found
1772 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1774 err = mesh_nexthop_lookup(fwd_skb, sdata);
1775 /* Failed to immediately resolve next hop:
1776 * fwded frame was dropped or will be added
1777 * later to the pending skb queue. */
1779 return RX_DROP_MONITOR;
1781 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1784 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1786 ieee80211_add_pending_skb(local, fwd_skb);
1790 if (is_multicast_ether_addr(hdr->addr1) ||
1791 sdata->dev->flags & IFF_PROMISC)
1794 return RX_DROP_MONITOR;
1798 static ieee80211_rx_result debug_noinline
1799 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1801 struct ieee80211_sub_if_data *sdata = rx->sdata;
1802 struct ieee80211_local *local = rx->local;
1803 struct net_device *dev = sdata->dev;
1804 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1805 __le16 fc = hdr->frame_control;
1808 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1811 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1812 return RX_DROP_MONITOR;
1815 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1816 * that a 4-addr station can be detected and moved into a separate VLAN
1818 if (ieee80211_has_a4(hdr->frame_control) &&
1819 sdata->vif.type == NL80211_IFTYPE_AP)
1820 return RX_DROP_MONITOR;
1822 err = __ieee80211_data_to_8023(rx);
1824 return RX_DROP_UNUSABLE;
1826 if (!ieee80211_frame_allowed(rx, fc))
1827 return RX_DROP_MONITOR;
1831 dev->stats.rx_packets++;
1832 dev->stats.rx_bytes += rx->skb->len;
1834 if (ieee80211_is_data(hdr->frame_control) &&
1835 !is_multicast_ether_addr(hdr->addr1) &&
1836 local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1837 mod_timer(&local->dynamic_ps_timer, jiffies +
1838 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1841 ieee80211_deliver_skb(rx);
1846 static ieee80211_rx_result debug_noinline
1847 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
1849 struct ieee80211_local *local = rx->local;
1850 struct ieee80211_hw *hw = &local->hw;
1851 struct sk_buff *skb = rx->skb;
1852 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1853 struct tid_ampdu_rx *tid_agg_rx;
1857 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1860 if (ieee80211_is_back_req(bar->frame_control)) {
1862 __le16 control, start_seq_num;
1863 } __packed bar_data;
1866 return RX_DROP_MONITOR;
1868 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1869 &bar_data, sizeof(bar_data)))
1870 return RX_DROP_MONITOR;
1872 tid = le16_to_cpu(bar_data.control) >> 12;
1874 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1876 return RX_DROP_MONITOR;
1878 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
1880 /* reset session timer */
1881 if (tid_agg_rx->timeout)
1882 mod_timer(&tid_agg_rx->session_timer,
1883 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1885 /* release stored frames up to start of BAR */
1886 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1893 * After this point, we only want management frames,
1894 * so we can drop all remaining control frames to
1895 * cooked monitor interfaces.
1897 return RX_DROP_MONITOR;
1900 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1901 struct ieee80211_mgmt *mgmt,
1904 struct ieee80211_local *local = sdata->local;
1905 struct sk_buff *skb;
1906 struct ieee80211_mgmt *resp;
1908 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
1909 /* Not to own unicast address */
1913 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1914 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1915 /* Not from the current AP or not associated yet. */
1919 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1920 /* Too short SA Query request frame */
1924 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1928 skb_reserve(skb, local->hw.extra_tx_headroom);
1929 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1930 memset(resp, 0, 24);
1931 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1932 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
1933 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1934 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1935 IEEE80211_STYPE_ACTION);
1936 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1937 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1938 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1939 memcpy(resp->u.action.u.sa_query.trans_id,
1940 mgmt->u.action.u.sa_query.trans_id,
1941 WLAN_SA_QUERY_TR_ID_LEN);
1943 ieee80211_tx_skb(sdata, skb);
1946 static ieee80211_rx_result debug_noinline
1947 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
1949 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1952 * From here on, look only at management frames.
1953 * Data and control frames are already handled,
1954 * and unknown (reserved) frames are useless.
1956 if (rx->skb->len < 24)
1957 return RX_DROP_MONITOR;
1959 if (!ieee80211_is_mgmt(mgmt->frame_control))
1960 return RX_DROP_MONITOR;
1962 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1963 return RX_DROP_MONITOR;
1965 if (ieee80211_drop_unencrypted_mgmt(rx))
1966 return RX_DROP_UNUSABLE;
1971 static ieee80211_rx_result debug_noinline
1972 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1974 struct ieee80211_local *local = rx->local;
1975 struct ieee80211_sub_if_data *sdata = rx->sdata;
1976 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1977 int len = rx->skb->len;
1979 if (!ieee80211_is_action(mgmt->frame_control))
1982 /* drop too small frames */
1983 if (len < IEEE80211_MIN_ACTION_SIZE)
1984 return RX_DROP_UNUSABLE;
1986 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
1987 return RX_DROP_UNUSABLE;
1989 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1990 return RX_DROP_UNUSABLE;
1992 switch (mgmt->u.action.category) {
1993 case WLAN_CATEGORY_BACK:
1995 * The aggregation code is not prepared to handle
1996 * anything but STA/AP due to the BSSID handling;
1997 * IBSS could work in the code but isn't supported
1998 * by drivers or the standard.
2000 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2001 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2002 sdata->vif.type != NL80211_IFTYPE_AP)
2005 /* verify action_code is present */
2006 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2009 switch (mgmt->u.action.u.addba_req.action_code) {
2010 case WLAN_ACTION_ADDBA_REQ:
2011 if (len < (IEEE80211_MIN_ACTION_SIZE +
2012 sizeof(mgmt->u.action.u.addba_req)))
2015 case WLAN_ACTION_ADDBA_RESP:
2016 if (len < (IEEE80211_MIN_ACTION_SIZE +
2017 sizeof(mgmt->u.action.u.addba_resp)))
2020 case WLAN_ACTION_DELBA:
2021 if (len < (IEEE80211_MIN_ACTION_SIZE +
2022 sizeof(mgmt->u.action.u.delba)))
2030 case WLAN_CATEGORY_SPECTRUM_MGMT:
2031 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2034 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2037 /* verify action_code is present */
2038 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2041 switch (mgmt->u.action.u.measurement.action_code) {
2042 case WLAN_ACTION_SPCT_MSR_REQ:
2043 if (len < (IEEE80211_MIN_ACTION_SIZE +
2044 sizeof(mgmt->u.action.u.measurement)))
2046 ieee80211_process_measurement_req(sdata, mgmt, len);
2048 case WLAN_ACTION_SPCT_CHL_SWITCH:
2049 if (len < (IEEE80211_MIN_ACTION_SIZE +
2050 sizeof(mgmt->u.action.u.chan_switch)))
2053 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2056 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2062 case WLAN_CATEGORY_SA_QUERY:
2063 if (len < (IEEE80211_MIN_ACTION_SIZE +
2064 sizeof(mgmt->u.action.u.sa_query)))
2067 switch (mgmt->u.action.u.sa_query.action) {
2068 case WLAN_ACTION_SA_QUERY_REQUEST:
2069 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2071 ieee80211_process_sa_query_req(sdata, mgmt, len);
2075 case WLAN_CATEGORY_MESH_PLINK:
2076 case WLAN_CATEGORY_MESH_PATH_SEL:
2077 if (!ieee80211_vif_is_mesh(&sdata->vif))
2085 rx->flags |= IEEE80211_MALFORMED_ACTION_FRM;
2086 /* will return in the next handlers */
2091 rx->sta->rx_packets++;
2092 dev_kfree_skb(rx->skb);
2096 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2097 skb_queue_tail(&sdata->skb_queue, rx->skb);
2098 ieee80211_queue_work(&local->hw, &sdata->work);
2100 rx->sta->rx_packets++;
2104 static ieee80211_rx_result debug_noinline
2105 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2107 struct ieee80211_rx_status *status;
2109 /* skip known-bad action frames and return them in the next handler */
2110 if (rx->flags & IEEE80211_MALFORMED_ACTION_FRM)
2114 * Getting here means the kernel doesn't know how to handle
2115 * it, but maybe userspace does ... include returned frames
2116 * so userspace can register for those to know whether ones
2117 * it transmitted were processed or returned.
2119 status = IEEE80211_SKB_RXCB(rx->skb);
2121 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2122 rx->skb->data, rx->skb->len,
2125 rx->sta->rx_packets++;
2126 dev_kfree_skb(rx->skb);
2134 static ieee80211_rx_result debug_noinline
2135 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2137 struct ieee80211_local *local = rx->local;
2138 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2139 struct sk_buff *nskb;
2140 struct ieee80211_sub_if_data *sdata = rx->sdata;
2142 if (!ieee80211_is_action(mgmt->frame_control))
2146 * For AP mode, hostapd is responsible for handling any action
2147 * frames that we didn't handle, including returning unknown
2148 * ones. For all other modes we will return them to the sender,
2149 * setting the 0x80 bit in the action category, as required by
2150 * 802.11-2007 7.3.1.11.
2151 * Newer versions of hostapd shall also use the management frame
2152 * registration mechanisms, but older ones still use cooked
2153 * monitor interfaces so push all frames there.
2155 if (!(rx->flags & IEEE80211_MALFORMED_ACTION_FRM) &&
2156 (sdata->vif.type == NL80211_IFTYPE_AP ||
2157 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2158 return RX_DROP_MONITOR;
2160 /* do not return rejected action frames */
2161 if (mgmt->u.action.category & 0x80)
2162 return RX_DROP_UNUSABLE;
2164 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2167 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2169 nmgmt->u.action.category |= 0x80;
2170 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2171 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2173 memset(nskb->cb, 0, sizeof(nskb->cb));
2175 ieee80211_tx_skb(rx->sdata, nskb);
2177 dev_kfree_skb(rx->skb);
2181 static ieee80211_rx_result debug_noinline
2182 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2184 struct ieee80211_sub_if_data *sdata = rx->sdata;
2185 ieee80211_rx_result rxs;
2186 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2189 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2190 if (rxs != RX_CONTINUE)
2193 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2195 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2196 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2197 sdata->vif.type != NL80211_IFTYPE_STATION)
2198 return RX_DROP_MONITOR;
2201 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2202 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2203 /* process for all: mesh, mlme, ibss */
2205 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2206 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2207 /* process only for station */
2208 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2209 return RX_DROP_MONITOR;
2211 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2212 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2213 /* process only for ibss */
2214 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2215 return RX_DROP_MONITOR;
2218 return RX_DROP_MONITOR;
2221 /* queue up frame and kick off work to process it */
2222 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2223 skb_queue_tail(&sdata->skb_queue, rx->skb);
2224 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2226 rx->sta->rx_packets++;
2231 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
2232 struct ieee80211_rx_data *rx)
2235 unsigned int hdrlen;
2237 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2238 if (rx->skb->len >= hdrlen + 4)
2239 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2245 * Some hardware seem to generate incorrect Michael MIC
2246 * reports; ignore them to avoid triggering countermeasures.
2251 if (!ieee80211_has_protected(hdr->frame_control))
2254 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
2256 * APs with pairwise keys should never receive Michael MIC
2257 * errors for non-zero keyidx because these are reserved for
2258 * group keys and only the AP is sending real multicast
2259 * frames in the BSS.
2264 if (!ieee80211_is_data(hdr->frame_control) &&
2265 !ieee80211_is_auth(hdr->frame_control))
2268 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2272 /* TODO: use IEEE80211_RX_FRAGMENTED */
2273 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2274 struct ieee80211_rate *rate)
2276 struct ieee80211_sub_if_data *sdata;
2277 struct ieee80211_local *local = rx->local;
2278 struct ieee80211_rtap_hdr {
2279 struct ieee80211_radiotap_header hdr;
2285 struct sk_buff *skb = rx->skb, *skb2;
2286 struct net_device *prev_dev = NULL;
2287 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2289 if (status->flag & RX_FLAG_INTERNAL_CMTR)
2292 if (skb_headroom(skb) < sizeof(*rthdr) &&
2293 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2296 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2297 memset(rthdr, 0, sizeof(*rthdr));
2298 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2299 rthdr->hdr.it_present =
2300 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2301 (1 << IEEE80211_RADIOTAP_CHANNEL));
2304 rthdr->rate_or_pad = rate->bitrate / 5;
2305 rthdr->hdr.it_present |=
2306 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2308 rthdr->chan_freq = cpu_to_le16(status->freq);
2310 if (status->band == IEEE80211_BAND_5GHZ)
2311 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2312 IEEE80211_CHAN_5GHZ);
2314 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2315 IEEE80211_CHAN_2GHZ);
2317 skb_set_mac_header(skb, 0);
2318 skb->ip_summed = CHECKSUM_UNNECESSARY;
2319 skb->pkt_type = PACKET_OTHERHOST;
2320 skb->protocol = htons(ETH_P_802_2);
2322 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2323 if (!ieee80211_sdata_running(sdata))
2326 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2327 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2331 skb2 = skb_clone(skb, GFP_ATOMIC);
2333 skb2->dev = prev_dev;
2334 netif_receive_skb(skb2);
2338 prev_dev = sdata->dev;
2339 sdata->dev->stats.rx_packets++;
2340 sdata->dev->stats.rx_bytes += skb->len;
2344 skb->dev = prev_dev;
2345 netif_receive_skb(skb);
2350 status->flag |= RX_FLAG_INTERNAL_CMTR;
2357 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2358 ieee80211_rx_result res)
2361 case RX_DROP_MONITOR:
2362 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2364 rx->sta->rx_dropped++;
2367 struct ieee80211_rate *rate = NULL;
2368 struct ieee80211_supported_band *sband;
2369 struct ieee80211_rx_status *status;
2371 status = IEEE80211_SKB_RXCB((rx->skb));
2373 sband = rx->local->hw.wiphy->bands[status->band];
2374 if (!(status->flag & RX_FLAG_HT))
2375 rate = &sband->bitrates[status->rate_idx];
2377 ieee80211_rx_cooked_monitor(rx, rate);
2380 case RX_DROP_UNUSABLE:
2381 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2383 rx->sta->rx_dropped++;
2384 dev_kfree_skb(rx->skb);
2387 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2392 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2393 struct sk_buff_head *frames)
2395 ieee80211_rx_result res = RX_DROP_MONITOR;
2396 struct sk_buff *skb;
2398 #define CALL_RXH(rxh) \
2401 if (res != RX_CONTINUE) \
2405 while ((skb = __skb_dequeue(frames))) {
2407 * all the other fields are valid across frames
2408 * that belong to an aMPDU since they are on the
2409 * same TID from the same station
2413 CALL_RXH(ieee80211_rx_h_decrypt)
2414 CALL_RXH(ieee80211_rx_h_check_more_data)
2415 CALL_RXH(ieee80211_rx_h_sta_process)
2416 CALL_RXH(ieee80211_rx_h_defragment)
2417 CALL_RXH(ieee80211_rx_h_ps_poll)
2418 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2419 /* must be after MMIC verify so header is counted in MPDU mic */
2420 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2421 CALL_RXH(ieee80211_rx_h_amsdu)
2422 #ifdef CONFIG_MAC80211_MESH
2423 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2424 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2426 CALL_RXH(ieee80211_rx_h_data)
2428 /* special treatment -- needs the queue */
2429 res = ieee80211_rx_h_ctrl(rx, frames);
2430 if (res != RX_CONTINUE)
2433 CALL_RXH(ieee80211_rx_h_mgmt_check)
2434 CALL_RXH(ieee80211_rx_h_action)
2435 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2436 CALL_RXH(ieee80211_rx_h_action_return)
2437 CALL_RXH(ieee80211_rx_h_mgmt)
2440 ieee80211_rx_handlers_result(rx, res);
2446 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2448 struct sk_buff_head reorder_release;
2449 ieee80211_rx_result res = RX_DROP_MONITOR;
2451 __skb_queue_head_init(&reorder_release);
2453 #define CALL_RXH(rxh) \
2456 if (res != RX_CONTINUE) \
2460 CALL_RXH(ieee80211_rx_h_passive_scan)
2461 CALL_RXH(ieee80211_rx_h_check)
2463 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2465 ieee80211_rx_handlers(rx, &reorder_release);
2469 ieee80211_rx_handlers_result(rx, res);
2475 * This function makes calls into the RX path. Therefore the
2476 * caller must hold the sta_info->lock and everything has to
2477 * be under rcu_read_lock protection as well.
2479 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2481 struct sk_buff_head frames;
2482 struct ieee80211_rx_data rx = { };
2483 struct tid_ampdu_rx *tid_agg_rx;
2485 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2489 __skb_queue_head_init(&frames);
2491 /* construct rx struct */
2493 rx.sdata = sta->sdata;
2494 rx.local = sta->local;
2496 rx.flags |= IEEE80211_RX_RA_MATCH;
2498 if (unlikely(test_bit(SCAN_HW_SCANNING, &sta->local->scanning) ||
2499 test_bit(SCAN_OFF_CHANNEL, &sta->local->scanning)))
2500 rx.flags |= IEEE80211_RX_IN_SCAN;
2502 spin_lock(&tid_agg_rx->reorder_lock);
2503 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
2504 spin_unlock(&tid_agg_rx->reorder_lock);
2506 ieee80211_rx_handlers(&rx, &frames);
2509 /* main receive path */
2511 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2512 struct ieee80211_hdr *hdr)
2514 struct ieee80211_sub_if_data *sdata = rx->sdata;
2515 struct sk_buff *skb = rx->skb;
2516 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2517 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2518 int multicast = is_multicast_ether_addr(hdr->addr1);
2520 switch (sdata->vif.type) {
2521 case NL80211_IFTYPE_STATION:
2522 if (!bssid && !sdata->u.mgd.use_4addr)
2525 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2526 if (!(sdata->dev->flags & IFF_PROMISC))
2528 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2531 case NL80211_IFTYPE_ADHOC:
2534 if (ieee80211_is_beacon(hdr->frame_control)) {
2537 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2538 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2540 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2541 } else if (!multicast &&
2542 compare_ether_addr(sdata->vif.addr,
2544 if (!(sdata->dev->flags & IFF_PROMISC))
2546 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2547 } else if (!rx->sta) {
2549 if (status->flag & RX_FLAG_HT)
2550 rate_idx = 0; /* TODO: HT rates */
2552 rate_idx = status->rate_idx;
2553 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2554 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2557 case NL80211_IFTYPE_MESH_POINT:
2559 compare_ether_addr(sdata->vif.addr,
2561 if (!(sdata->dev->flags & IFF_PROMISC))
2564 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2567 case NL80211_IFTYPE_AP_VLAN:
2568 case NL80211_IFTYPE_AP:
2570 if (compare_ether_addr(sdata->vif.addr,
2573 } else if (!ieee80211_bssid_match(bssid,
2575 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2577 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2580 case NL80211_IFTYPE_WDS:
2581 if (bssid || !ieee80211_is_data(hdr->frame_control))
2583 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2587 /* should never get here */
2596 * This function returns whether or not the SKB
2597 * was destined for RX processing or not, which,
2598 * if consume is true, is equivalent to whether
2599 * or not the skb was consumed.
2601 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2602 struct sk_buff *skb, bool consume)
2604 struct ieee80211_local *local = rx->local;
2605 struct ieee80211_sub_if_data *sdata = rx->sdata;
2606 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2607 struct ieee80211_hdr *hdr = (void *)skb->data;
2611 rx->flags |= IEEE80211_RX_RA_MATCH;
2612 prepares = prepare_for_handlers(rx, hdr);
2617 if (status->flag & RX_FLAG_MMIC_ERROR) {
2618 if (rx->flags & IEEE80211_RX_RA_MATCH)
2619 ieee80211_rx_michael_mic_report(hdr, rx);
2624 skb = skb_copy(skb, GFP_ATOMIC);
2626 if (net_ratelimit())
2627 wiphy_debug(local->hw.wiphy,
2628 "failed to copy multicast frame for %s\n",
2636 ieee80211_invoke_rx_handlers(rx);
2641 * This is the actual Rx frames handler. as it blongs to Rx path it must
2642 * be called with rcu_read_lock protection.
2644 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2645 struct sk_buff *skb)
2647 struct ieee80211_local *local = hw_to_local(hw);
2648 struct ieee80211_sub_if_data *sdata;
2649 struct ieee80211_hdr *hdr;
2651 struct ieee80211_rx_data rx;
2652 struct ieee80211_sub_if_data *prev;
2653 struct sta_info *sta, *tmp, *prev_sta;
2656 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2657 memset(&rx, 0, sizeof(rx));
2661 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2662 local->dot11ReceivedFragmentCount++;
2664 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2665 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2666 rx.flags |= IEEE80211_RX_IN_SCAN;
2668 if (ieee80211_is_mgmt(fc))
2669 err = skb_linearize(skb);
2671 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2678 hdr = (struct ieee80211_hdr *)skb->data;
2679 ieee80211_parse_qos(&rx);
2680 ieee80211_verify_alignment(&rx);
2682 if (ieee80211_is_data(fc)) {
2685 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2692 rx.sdata = prev_sta->sdata;
2693 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2700 rx.sdata = prev_sta->sdata;
2702 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2709 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2710 if (!ieee80211_sdata_running(sdata))
2713 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2714 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2718 * frame is destined for this interface, but if it's
2719 * not also for the previous one we handle that after
2720 * the loop to avoid copying the SKB once too much
2728 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2730 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2736 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2739 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2747 * This is the receive path handler. It is called by a low level driver when an
2748 * 802.11 MPDU is received from the hardware.
2750 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2752 struct ieee80211_local *local = hw_to_local(hw);
2753 struct ieee80211_rate *rate = NULL;
2754 struct ieee80211_supported_band *sband;
2755 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2757 WARN_ON_ONCE(softirq_count() == 0);
2759 if (WARN_ON(status->band < 0 ||
2760 status->band >= IEEE80211_NUM_BANDS))
2763 sband = local->hw.wiphy->bands[status->band];
2764 if (WARN_ON(!sband))
2768 * If we're suspending, it is possible although not too likely
2769 * that we'd be receiving frames after having already partially
2770 * quiesced the stack. We can't process such frames then since
2771 * that might, for example, cause stations to be added or other
2772 * driver callbacks be invoked.
2774 if (unlikely(local->quiescing || local->suspended))
2778 * The same happens when we're not even started,
2779 * but that's worth a warning.
2781 if (WARN_ON(!local->started))
2784 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
2786 * Validate the rate, unless a PLCP error means that
2787 * we probably can't have a valid rate here anyway.
2790 if (status->flag & RX_FLAG_HT) {
2792 * rate_idx is MCS index, which can be [0-76]
2795 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2797 * Anything else would be some sort of driver or
2798 * hardware error. The driver should catch hardware
2801 if (WARN((status->rate_idx < 0 ||
2802 status->rate_idx > 76),
2803 "Rate marked as an HT rate but passed "
2804 "status->rate_idx is not "
2805 "an MCS index [0-76]: %d (0x%02x)\n",
2810 if (WARN_ON(status->rate_idx < 0 ||
2811 status->rate_idx >= sband->n_bitrates))
2813 rate = &sband->bitrates[status->rate_idx];
2818 * key references and virtual interfaces are protected using RCU
2819 * and this requires that we are in a read-side RCU section during
2820 * receive processing
2825 * Frames with failed FCS/PLCP checksum are not returned,
2826 * all other frames are returned without radiotap header
2827 * if it was previously present.
2828 * Also, frames with less than 16 bytes are dropped.
2830 skb = ieee80211_rx_monitor(local, skb, rate);
2836 __ieee80211_rx_handle_packet(hw, skb);
2844 EXPORT_SYMBOL(ieee80211_rx);
2846 /* This is a version of the rx handler that can be called from hard irq
2847 * context. Post the skb on the queue and schedule the tasklet */
2848 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2850 struct ieee80211_local *local = hw_to_local(hw);
2852 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2854 skb->pkt_type = IEEE80211_RX_MSG;
2855 skb_queue_tail(&local->skb_queue, skb);
2856 tasklet_schedule(&local->tasklet);
2858 EXPORT_SYMBOL(ieee80211_rx_irqsafe);