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 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/kernel.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rcupdate.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "driver-ops.h"
31 * monitor mode reception
33 * This function cleans up the SKB, i.e. it removes all the stuff
34 * only useful for monitoring.
36 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
39 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
40 if (likely(skb->len > FCS_LEN))
41 skb_trim(skb, skb->len - FCS_LEN);
53 static inline int should_drop_frame(struct sk_buff *skb,
56 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
57 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
59 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 if (unlikely(skb->len < 16 + present_fcs_len))
63 if (ieee80211_is_ctl(hdr->frame_control) &&
64 !ieee80211_is_pspoll(hdr->frame_control) &&
65 !ieee80211_is_back_req(hdr->frame_control))
71 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
72 struct ieee80211_rx_status *status)
76 /* always present fields */
77 len = sizeof(struct ieee80211_radiotap_header) + 9;
79 if (status->flag & RX_FLAG_TSFT)
81 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
83 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
86 if (len & 1) /* padding for RX_FLAGS if necessary */
93 * ieee80211_add_rx_radiotap_header - add radiotap header
95 * add a radiotap header containing all the fields which the hardware provided.
98 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
100 struct ieee80211_rate *rate,
103 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
104 struct ieee80211_radiotap_header *rthdr;
108 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
109 memset(rthdr, 0, rtap_len);
111 /* radiotap header, set always present flags */
113 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
114 (1 << IEEE80211_RADIOTAP_CHANNEL) |
115 (1 << IEEE80211_RADIOTAP_ANTENNA) |
116 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
117 rthdr->it_len = cpu_to_le16(rtap_len);
119 pos = (unsigned char *)(rthdr+1);
121 /* the order of the following fields is important */
123 /* IEEE80211_RADIOTAP_TSFT */
124 if (status->flag & RX_FLAG_TSFT) {
125 put_unaligned_le64(status->mactime, pos);
127 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
131 /* IEEE80211_RADIOTAP_FLAGS */
132 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
133 *pos |= IEEE80211_RADIOTAP_F_FCS;
134 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
135 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
136 if (status->flag & RX_FLAG_SHORTPRE)
137 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
140 /* IEEE80211_RADIOTAP_RATE */
141 if (status->flag & RX_FLAG_HT) {
143 * TODO: add following information into radiotap header once
144 * suitable fields are defined for it:
145 * - MCS index (status->rate_idx)
146 * - HT40 (status->flag & RX_FLAG_40MHZ)
147 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
151 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
152 *pos = rate->bitrate / 5;
156 /* IEEE80211_RADIOTAP_CHANNEL */
157 put_unaligned_le16(status->freq, pos);
159 if (status->band == IEEE80211_BAND_5GHZ)
160 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
162 else if (status->flag & RX_FLAG_HT)
163 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
165 else if (rate->flags & IEEE80211_RATE_ERP_G)
166 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
169 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
175 *pos = status->signal;
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
181 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
182 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
183 *pos = status->noise;
185 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
189 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
191 /* IEEE80211_RADIOTAP_ANTENNA */
192 *pos = status->antenna;
195 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
197 /* IEEE80211_RADIOTAP_RX_FLAGS */
198 /* ensure 2 byte alignment for the 2 byte field as required */
199 if ((pos - (u8 *)rthdr) & 1)
201 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
202 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
203 put_unaligned_le16(rx_flags, pos);
208 * This function copies a received frame to all monitor interfaces and
209 * returns a cleaned-up SKB that no longer includes the FCS nor the
210 * radiotap header the driver might have added.
212 static struct sk_buff *
213 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
214 struct ieee80211_rate *rate)
216 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
217 struct ieee80211_sub_if_data *sdata;
218 int needed_headroom = 0;
219 struct sk_buff *skb, *skb2;
220 struct net_device *prev_dev = NULL;
221 int present_fcs_len = 0;
224 * First, we may need to make a copy of the skb because
225 * (1) we need to modify it for radiotap (if not present), and
226 * (2) the other RX handlers will modify the skb we got.
228 * We don't need to, of course, if we aren't going to return
229 * the SKB because it has a bad FCS/PLCP checksum.
232 /* room for the radiotap header based on driver features */
233 needed_headroom = ieee80211_rx_radiotap_len(local, status);
235 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
236 present_fcs_len = FCS_LEN;
238 if (!local->monitors) {
239 if (should_drop_frame(origskb, present_fcs_len)) {
240 dev_kfree_skb(origskb);
244 return remove_monitor_info(local, origskb);
247 if (should_drop_frame(origskb, present_fcs_len)) {
248 /* only need to expand headroom if necessary */
253 * This shouldn't trigger often because most devices have an
254 * RX header they pull before we get here, and that should
255 * be big enough for our radiotap information. We should
256 * probably export the length to drivers so that we can have
257 * them allocate enough headroom to start with.
259 if (skb_headroom(skb) < needed_headroom &&
260 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
266 * Need to make a copy and possibly remove radiotap header
267 * and FCS from the original.
269 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
271 origskb = remove_monitor_info(local, origskb);
277 /* prepend radiotap information */
278 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
280 skb_reset_mac_header(skb);
281 skb->ip_summed = CHECKSUM_UNNECESSARY;
282 skb->pkt_type = PACKET_OTHERHOST;
283 skb->protocol = htons(ETH_P_802_2);
285 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
286 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
289 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
292 if (!netif_running(sdata->dev))
296 skb2 = skb_clone(skb, GFP_ATOMIC);
298 skb2->dev = prev_dev;
303 prev_dev = sdata->dev;
304 sdata->dev->stats.rx_packets++;
305 sdata->dev->stats.rx_bytes += skb->len;
318 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
320 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
323 /* does the frame have a qos control field? */
324 if (ieee80211_is_data_qos(hdr->frame_control)) {
325 u8 *qc = ieee80211_get_qos_ctl(hdr);
326 /* frame has qos control */
327 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
328 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
329 rx->flags |= IEEE80211_RX_AMSDU;
331 rx->flags &= ~IEEE80211_RX_AMSDU;
334 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
336 * Sequence numbers for management frames, QoS data
337 * frames with a broadcast/multicast address in the
338 * Address 1 field, and all non-QoS data frames sent
339 * by QoS STAs are assigned using an additional single
340 * modulo-4096 counter, [...]
342 * We also use that counter for non-QoS STAs.
344 tid = NUM_RX_DATA_QUEUES - 1;
348 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
349 * For now, set skb->priority to 0 for other cases. */
350 rx->skb->priority = (tid > 7) ? 0 : tid;
354 * DOC: Packet alignment
356 * Drivers always need to pass packets that are aligned to two-byte boundaries
359 * Additionally, should, if possible, align the payload data in a way that
360 * guarantees that the contained IP header is aligned to a four-byte
361 * boundary. In the case of regular frames, this simply means aligning the
362 * payload to a four-byte boundary (because either the IP header is directly
363 * contained, or IV/RFC1042 headers that have a length divisible by four are
364 * in front of it). If the payload data is not properly aligned and the
365 * architecture doesn't support efficient unaligned operations, mac80211
366 * will align the data.
368 * With A-MSDU frames, however, the payload data address must yield two modulo
369 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
370 * push the IP header further back to a multiple of four again. Thankfully, the
371 * specs were sane enough this time around to require padding each A-MSDU
372 * subframe to a length that is a multiple of four.
374 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
375 * the payload is not supported, the driver is required to move the 802.11
376 * header to be directly in front of the payload in that case.
378 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
380 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
381 WARN_ONCE((unsigned long)rx->skb->data & 1,
382 "unaligned packet at 0x%p\n", rx->skb->data);
389 static ieee80211_rx_result debug_noinline
390 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
392 struct ieee80211_local *local = rx->local;
393 struct sk_buff *skb = rx->skb;
395 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
396 return ieee80211_scan_rx(rx->sdata, skb);
398 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
399 (rx->flags & IEEE80211_RX_IN_SCAN))) {
400 /* drop all the other packets during a software scan anyway */
401 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
406 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
407 /* scanning finished during invoking of handlers */
408 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
409 return RX_DROP_UNUSABLE;
416 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
418 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
420 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
423 return ieee80211_is_robust_mgmt_frame(hdr);
427 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
429 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
431 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
434 return ieee80211_is_robust_mgmt_frame(hdr);
438 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
439 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
441 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
442 struct ieee80211_mmie *mmie;
444 if (skb->len < 24 + sizeof(*mmie) ||
445 !is_multicast_ether_addr(hdr->da))
448 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
449 return -1; /* not a robust management frame */
451 mmie = (struct ieee80211_mmie *)
452 (skb->data + skb->len - sizeof(*mmie));
453 if (mmie->element_id != WLAN_EID_MMIE ||
454 mmie->length != sizeof(*mmie) - 2)
457 return le16_to_cpu(mmie->key_id);
461 static ieee80211_rx_result
462 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
464 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
465 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
466 char *dev_addr = rx->sdata->vif.addr;
468 if (ieee80211_is_data(hdr->frame_control)) {
469 if (is_multicast_ether_addr(hdr->addr1)) {
470 if (ieee80211_has_tods(hdr->frame_control) ||
471 !ieee80211_has_fromds(hdr->frame_control))
472 return RX_DROP_MONITOR;
473 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
474 return RX_DROP_MONITOR;
476 if (!ieee80211_has_a4(hdr->frame_control))
477 return RX_DROP_MONITOR;
478 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
479 return RX_DROP_MONITOR;
483 /* If there is not an established peer link and this is not a peer link
484 * establisment frame, beacon or probe, drop the frame.
487 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
488 struct ieee80211_mgmt *mgmt;
490 if (!ieee80211_is_mgmt(hdr->frame_control))
491 return RX_DROP_MONITOR;
493 if (ieee80211_is_action(hdr->frame_control)) {
494 mgmt = (struct ieee80211_mgmt *)hdr;
495 if (mgmt->u.action.category != MESH_PLINK_CATEGORY)
496 return RX_DROP_MONITOR;
500 if (ieee80211_is_probe_req(hdr->frame_control) ||
501 ieee80211_is_probe_resp(hdr->frame_control) ||
502 ieee80211_is_beacon(hdr->frame_control))
505 return RX_DROP_MONITOR;
509 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
511 if (ieee80211_is_data(hdr->frame_control) &&
512 is_multicast_ether_addr(hdr->addr1) &&
513 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
514 return RX_DROP_MONITOR;
520 #define SEQ_MODULO 0x1000
521 #define SEQ_MASK 0xfff
523 static inline int seq_less(u16 sq1, u16 sq2)
525 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
528 static inline u16 seq_inc(u16 sq)
530 return (sq + 1) & SEQ_MASK;
533 static inline u16 seq_sub(u16 sq1, u16 sq2)
535 return (sq1 - sq2) & SEQ_MASK;
539 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
540 struct tid_ampdu_rx *tid_agg_rx,
542 struct sk_buff_head *frames)
544 struct ieee80211_supported_band *sband;
545 struct ieee80211_rate *rate = NULL;
546 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
547 struct ieee80211_rx_status *status;
552 status = IEEE80211_SKB_RXCB(skb);
554 /* release the reordered frames to stack */
555 sband = hw->wiphy->bands[status->band];
556 if (!(status->flag & RX_FLAG_HT))
557 rate = &sband->bitrates[status->rate_idx];
558 tid_agg_rx->stored_mpdu_num--;
559 tid_agg_rx->reorder_buf[index] = NULL;
560 __skb_queue_tail(frames, skb);
563 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
566 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
567 struct tid_ampdu_rx *tid_agg_rx,
569 struct sk_buff_head *frames)
573 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
574 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
575 tid_agg_rx->buf_size;
576 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
581 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
582 * the skb was added to the buffer longer than this time ago, the earlier
583 * frames that have not yet been received are assumed to be lost and the skb
584 * can be released for processing. This may also release other skb's from the
585 * reorder buffer if there are no additional gaps between the frames.
587 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
590 * As this function belongs to the RX path it must be under
591 * rcu_read_lock protection. It returns false if the frame
592 * can be processed immediately, true if it was consumed.
594 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
595 struct tid_ampdu_rx *tid_agg_rx,
597 struct sk_buff_head *frames)
599 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
600 u16 sc = le16_to_cpu(hdr->seq_ctrl);
601 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
602 u16 head_seq_num, buf_size;
605 buf_size = tid_agg_rx->buf_size;
606 head_seq_num = tid_agg_rx->head_seq_num;
608 /* frame with out of date sequence number */
609 if (seq_less(mpdu_seq_num, head_seq_num)) {
615 * If frame the sequence number exceeds our buffering window
616 * size release some previous frames to make room for this one.
618 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
619 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
620 /* release stored frames up to new head to stack */
621 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
625 /* Now the new frame is always in the range of the reordering buffer */
627 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
629 /* check if we already stored this frame */
630 if (tid_agg_rx->reorder_buf[index]) {
636 * If the current MPDU is in the right order and nothing else
637 * is stored we can process it directly, no need to buffer it.
639 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
640 tid_agg_rx->stored_mpdu_num == 0) {
641 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
645 /* put the frame in the reordering buffer */
646 tid_agg_rx->reorder_buf[index] = skb;
647 tid_agg_rx->reorder_time[index] = jiffies;
648 tid_agg_rx->stored_mpdu_num++;
649 /* release the buffer until next missing frame */
650 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
651 tid_agg_rx->buf_size;
652 if (!tid_agg_rx->reorder_buf[index] &&
653 tid_agg_rx->stored_mpdu_num > 1) {
655 * No buffers ready to be released, but check whether any
656 * frames in the reorder buffer have timed out.
660 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
661 j = (j + 1) % tid_agg_rx->buf_size) {
662 if (!tid_agg_rx->reorder_buf[j]) {
666 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
667 HT_RX_REORDER_BUF_TIMEOUT))
670 #ifdef CONFIG_MAC80211_HT_DEBUG
672 printk(KERN_DEBUG "%s: release an RX reorder "
673 "frame due to timeout on earlier "
675 wiphy_name(hw->wiphy));
677 ieee80211_release_reorder_frame(hw, tid_agg_rx,
681 * Increment the head seq# also for the skipped slots.
683 tid_agg_rx->head_seq_num =
684 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
687 } else while (tid_agg_rx->reorder_buf[index]) {
688 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
689 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
690 tid_agg_rx->buf_size;
697 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
698 * true if the MPDU was buffered, false if it should be processed.
700 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
701 struct sk_buff_head *frames)
703 struct sk_buff *skb = rx->skb;
704 struct ieee80211_local *local = rx->local;
705 struct ieee80211_hw *hw = &local->hw;
706 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
707 struct sta_info *sta = rx->sta;
708 struct tid_ampdu_rx *tid_agg_rx;
712 if (!ieee80211_is_data_qos(hdr->frame_control))
716 * filter the QoS data rx stream according to
717 * STA/TID and check if this STA/TID is on aggregation
723 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
725 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
728 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
730 /* qos null data frames are excluded */
731 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
734 /* new, potentially un-ordered, ampdu frame - process it */
736 /* reset session timer */
737 if (tid_agg_rx->timeout)
738 mod_timer(&tid_agg_rx->session_timer,
739 TU_TO_EXP_TIME(tid_agg_rx->timeout));
741 /* if this mpdu is fragmented - terminate rx aggregation session */
742 sc = le16_to_cpu(hdr->seq_ctrl);
743 if (sc & IEEE80211_SCTL_FRAG) {
744 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
745 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
750 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
754 __skb_queue_tail(frames, skb);
757 static ieee80211_rx_result debug_noinline
758 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
760 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
762 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
763 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
764 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
765 rx->sta->last_seq_ctrl[rx->queue] ==
767 if (rx->flags & IEEE80211_RX_RA_MATCH) {
768 rx->local->dot11FrameDuplicateCount++;
769 rx->sta->num_duplicates++;
771 return RX_DROP_MONITOR;
773 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
776 if (unlikely(rx->skb->len < 16)) {
777 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
778 return RX_DROP_MONITOR;
781 /* Drop disallowed frame classes based on STA auth/assoc state;
782 * IEEE 802.11, Chap 5.5.
784 * mac80211 filters only based on association state, i.e. it drops
785 * Class 3 frames from not associated stations. hostapd sends
786 * deauth/disassoc frames when needed. In addition, hostapd is
787 * responsible for filtering on both auth and assoc states.
790 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
791 return ieee80211_rx_mesh_check(rx);
793 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
794 ieee80211_is_pspoll(hdr->frame_control)) &&
795 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
796 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
797 if ((!ieee80211_has_fromds(hdr->frame_control) &&
798 !ieee80211_has_tods(hdr->frame_control) &&
799 ieee80211_is_data(hdr->frame_control)) ||
800 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
801 /* Drop IBSS frames and frames for other hosts
803 return RX_DROP_MONITOR;
806 return RX_DROP_MONITOR;
813 static ieee80211_rx_result debug_noinline
814 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
816 struct sk_buff *skb = rx->skb;
817 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
818 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
821 ieee80211_rx_result result = RX_DROP_UNUSABLE;
822 struct ieee80211_key *stakey = NULL;
823 int mmie_keyidx = -1;
828 * There are four types of keys:
830 * - IGTK (group keys for management frames)
831 * - PTK (pairwise keys)
832 * - STK (station-to-station pairwise keys)
834 * When selecting a key, we have to distinguish between multicast
835 * (including broadcast) and unicast frames, the latter can only
836 * use PTKs and STKs while the former always use GTKs and IGTKs.
837 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
838 * unicast frames can also use key indices like GTKs. Hence, if we
839 * don't have a PTK/STK we check the key index for a WEP key.
841 * Note that in a regular BSS, multicast frames are sent by the
842 * AP only, associated stations unicast the frame to the AP first
843 * which then multicasts it on their behalf.
845 * There is also a slight problem in IBSS mode: GTKs are negotiated
846 * with each station, that is something we don't currently handle.
847 * The spec seems to expect that one negotiates the same key with
848 * every station but there's no such requirement; VLANs could be
853 * No point in finding a key and decrypting if the frame is neither
854 * addressed to us nor a multicast frame.
856 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
859 /* start without a key */
863 stakey = rcu_dereference(rx->sta->key);
865 if (!ieee80211_has_protected(hdr->frame_control))
866 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
868 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
870 /* Skip decryption if the frame is not protected. */
871 if (!ieee80211_has_protected(hdr->frame_control))
873 } else if (mmie_keyidx >= 0) {
874 /* Broadcast/multicast robust management frame / BIP */
875 if ((status->flag & RX_FLAG_DECRYPTED) &&
876 (status->flag & RX_FLAG_IV_STRIPPED))
879 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
880 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
881 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
882 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
883 } else if (!ieee80211_has_protected(hdr->frame_control)) {
885 * The frame was not protected, so skip decryption. However, we
886 * need to set rx->key if there is a key that could have been
887 * used so that the frame may be dropped if encryption would
888 * have been expected.
890 struct ieee80211_key *key = NULL;
891 if (ieee80211_is_mgmt(hdr->frame_control) &&
892 is_multicast_ether_addr(hdr->addr1) &&
893 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
895 else if ((key = rcu_dereference(rx->sdata->default_key)))
900 * The device doesn't give us the IV so we won't be
901 * able to look up the key. That's ok though, we
902 * don't need to decrypt the frame, we just won't
903 * be able to keep statistics accurate.
904 * Except for key threshold notifications, should
905 * we somehow allow the driver to tell us which key
906 * the hardware used if this flag is set?
908 if ((status->flag & RX_FLAG_DECRYPTED) &&
909 (status->flag & RX_FLAG_IV_STRIPPED))
912 hdrlen = ieee80211_hdrlen(hdr->frame_control);
914 if (rx->skb->len < 8 + hdrlen)
915 return RX_DROP_UNUSABLE; /* TODO: count this? */
918 * no need to call ieee80211_wep_get_keyidx,
919 * it verifies a bunch of things we've done already
921 keyidx = rx->skb->data[hdrlen + 3] >> 6;
923 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
926 * RSNA-protected unicast frames should always be sent with
927 * pairwise or station-to-station keys, but for WEP we allow
928 * using a key index as well.
930 if (rx->key && rx->key->conf.alg != ALG_WEP &&
931 !is_multicast_ether_addr(hdr->addr1))
936 rx->key->tx_rx_count++;
937 /* TODO: add threshold stuff again */
939 return RX_DROP_MONITOR;
942 /* Check for weak IVs if possible */
943 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
944 ieee80211_is_data(hdr->frame_control) &&
945 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
946 !(status->flag & RX_FLAG_DECRYPTED)) &&
947 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
948 rx->sta->wep_weak_iv_count++;
950 switch (rx->key->conf.alg) {
952 result = ieee80211_crypto_wep_decrypt(rx);
955 result = ieee80211_crypto_tkip_decrypt(rx);
958 result = ieee80211_crypto_ccmp_decrypt(rx);
961 result = ieee80211_crypto_aes_cmac_decrypt(rx);
965 /* either the frame has been decrypted or will be dropped */
966 status->flag |= RX_FLAG_DECRYPTED;
971 static ieee80211_rx_result debug_noinline
972 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
974 struct ieee80211_local *local;
975 struct ieee80211_hdr *hdr;
980 hdr = (struct ieee80211_hdr *) skb->data;
982 if (!local->pspolling)
985 if (!ieee80211_has_fromds(hdr->frame_control))
986 /* this is not from AP */
989 if (!ieee80211_is_data(hdr->frame_control))
992 if (!ieee80211_has_moredata(hdr->frame_control)) {
993 /* AP has no more frames buffered for us */
994 local->pspolling = false;
998 /* more data bit is set, let's request a new frame from the AP */
999 ieee80211_send_pspoll(local, rx->sdata);
1004 static void ap_sta_ps_start(struct sta_info *sta)
1006 struct ieee80211_sub_if_data *sdata = sta->sdata;
1007 struct ieee80211_local *local = sdata->local;
1009 atomic_inc(&sdata->bss->num_sta_ps);
1010 set_sta_flags(sta, WLAN_STA_PS_STA);
1011 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1012 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1013 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1014 sdata->name, sta->sta.addr, sta->sta.aid);
1015 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1018 static void ap_sta_ps_end(struct sta_info *sta)
1020 struct ieee80211_sub_if_data *sdata = sta->sdata;
1022 atomic_dec(&sdata->bss->num_sta_ps);
1024 clear_sta_flags(sta, WLAN_STA_PS_STA);
1026 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1027 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1028 sdata->name, sta->sta.addr, sta->sta.aid);
1029 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1031 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
1032 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1033 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1034 sdata->name, sta->sta.addr, sta->sta.aid);
1035 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1039 ieee80211_sta_ps_deliver_wakeup(sta);
1042 static ieee80211_rx_result debug_noinline
1043 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1045 struct sta_info *sta = rx->sta;
1046 struct sk_buff *skb = rx->skb;
1047 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1048 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1054 * Update last_rx only for IBSS packets which are for the current
1055 * BSSID to avoid keeping the current IBSS network alive in cases
1056 * where other STAs start using different BSSID.
1058 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1059 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1060 NL80211_IFTYPE_ADHOC);
1061 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
1062 sta->last_rx = jiffies;
1063 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1065 * Mesh beacons will update last_rx when if they are found to
1066 * match the current local configuration when processed.
1068 sta->last_rx = jiffies;
1071 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1074 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1075 ieee80211_sta_rx_notify(rx->sdata, hdr);
1077 sta->rx_fragments++;
1078 sta->rx_bytes += rx->skb->len;
1079 sta->last_signal = status->signal;
1080 sta->last_noise = status->noise;
1083 * Change STA power saving mode only at the end of a frame
1084 * exchange sequence.
1086 if (!ieee80211_has_morefrags(hdr->frame_control) &&
1087 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1088 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1089 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
1091 * Ignore doze->wake transitions that are
1092 * indicated by non-data frames, the standard
1093 * is unclear here, but for example going to
1094 * PS mode and then scanning would cause a
1095 * doze->wake transition for the probe request,
1096 * and that is clearly undesirable.
1098 if (ieee80211_is_data(hdr->frame_control) &&
1099 !ieee80211_has_pm(hdr->frame_control))
1102 if (ieee80211_has_pm(hdr->frame_control))
1103 ap_sta_ps_start(sta);
1108 * Drop (qos-)data::nullfunc frames silently, since they
1109 * are used only to control station power saving mode.
1111 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1112 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1113 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1115 * Update counter and free packet here to avoid
1116 * counting this as a dropped packed.
1119 dev_kfree_skb(rx->skb);
1124 } /* ieee80211_rx_h_sta_process */
1126 static inline struct ieee80211_fragment_entry *
1127 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1128 unsigned int frag, unsigned int seq, int rx_queue,
1129 struct sk_buff **skb)
1131 struct ieee80211_fragment_entry *entry;
1134 idx = sdata->fragment_next;
1135 entry = &sdata->fragments[sdata->fragment_next++];
1136 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1137 sdata->fragment_next = 0;
1139 if (!skb_queue_empty(&entry->skb_list)) {
1140 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1141 struct ieee80211_hdr *hdr =
1142 (struct ieee80211_hdr *) entry->skb_list.next->data;
1143 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1144 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1145 "addr1=%pM addr2=%pM\n",
1147 jiffies - entry->first_frag_time, entry->seq,
1148 entry->last_frag, hdr->addr1, hdr->addr2);
1150 __skb_queue_purge(&entry->skb_list);
1153 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1155 entry->first_frag_time = jiffies;
1157 entry->rx_queue = rx_queue;
1158 entry->last_frag = frag;
1160 entry->extra_len = 0;
1165 static inline struct ieee80211_fragment_entry *
1166 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1167 unsigned int frag, unsigned int seq,
1168 int rx_queue, struct ieee80211_hdr *hdr)
1170 struct ieee80211_fragment_entry *entry;
1173 idx = sdata->fragment_next;
1174 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1175 struct ieee80211_hdr *f_hdr;
1179 idx = IEEE80211_FRAGMENT_MAX - 1;
1181 entry = &sdata->fragments[idx];
1182 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1183 entry->rx_queue != rx_queue ||
1184 entry->last_frag + 1 != frag)
1187 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1190 * Check ftype and addresses are equal, else check next fragment
1192 if (((hdr->frame_control ^ f_hdr->frame_control) &
1193 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1194 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1195 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1198 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1199 __skb_queue_purge(&entry->skb_list);
1208 static ieee80211_rx_result debug_noinline
1209 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1211 struct ieee80211_hdr *hdr;
1214 unsigned int frag, seq;
1215 struct ieee80211_fragment_entry *entry;
1216 struct sk_buff *skb;
1218 hdr = (struct ieee80211_hdr *)rx->skb->data;
1219 fc = hdr->frame_control;
1220 sc = le16_to_cpu(hdr->seq_ctrl);
1221 frag = sc & IEEE80211_SCTL_FRAG;
1223 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1224 (rx->skb)->len < 24 ||
1225 is_multicast_ether_addr(hdr->addr1))) {
1226 /* not fragmented */
1229 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1231 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1234 /* This is the first fragment of a new frame. */
1235 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1236 rx->queue, &(rx->skb));
1237 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1238 ieee80211_has_protected(fc)) {
1239 /* Store CCMP PN so that we can verify that the next
1240 * fragment has a sequential PN value. */
1242 memcpy(entry->last_pn,
1243 rx->key->u.ccmp.rx_pn[rx->queue],
1249 /* This is a fragment for a frame that should already be pending in
1250 * fragment cache. Add this fragment to the end of the pending entry.
1252 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1254 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1255 return RX_DROP_MONITOR;
1258 /* Verify that MPDUs within one MSDU have sequential PN values.
1259 * (IEEE 802.11i, 8.3.3.4.5) */
1262 u8 pn[CCMP_PN_LEN], *rpn;
1263 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1264 return RX_DROP_UNUSABLE;
1265 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1266 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1271 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1272 if (memcmp(pn, rpn, CCMP_PN_LEN))
1273 return RX_DROP_UNUSABLE;
1274 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1277 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1278 __skb_queue_tail(&entry->skb_list, rx->skb);
1279 entry->last_frag = frag;
1280 entry->extra_len += rx->skb->len;
1281 if (ieee80211_has_morefrags(fc)) {
1286 rx->skb = __skb_dequeue(&entry->skb_list);
1287 if (skb_tailroom(rx->skb) < entry->extra_len) {
1288 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1289 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1291 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1292 __skb_queue_purge(&entry->skb_list);
1293 return RX_DROP_UNUSABLE;
1296 while ((skb = __skb_dequeue(&entry->skb_list))) {
1297 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1301 /* Complete frame has been reassembled - process it now */
1302 rx->flags |= IEEE80211_RX_FRAGMENTED;
1306 rx->sta->rx_packets++;
1307 if (is_multicast_ether_addr(hdr->addr1))
1308 rx->local->dot11MulticastReceivedFrameCount++;
1310 ieee80211_led_rx(rx->local);
1314 static ieee80211_rx_result debug_noinline
1315 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1317 struct ieee80211_sub_if_data *sdata = rx->sdata;
1318 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1320 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1321 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1324 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1325 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1326 return RX_DROP_UNUSABLE;
1328 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1329 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1331 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1333 /* Free PS Poll skb here instead of returning RX_DROP that would
1334 * count as an dropped frame. */
1335 dev_kfree_skb(rx->skb);
1340 static ieee80211_rx_result debug_noinline
1341 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1343 u8 *data = rx->skb->data;
1344 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1346 if (!ieee80211_is_data_qos(hdr->frame_control))
1349 /* remove the qos control field, update frame type and meta-data */
1350 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1351 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1352 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1353 /* change frame type to non QOS */
1354 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1360 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1362 if (unlikely(!rx->sta ||
1363 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1370 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1372 struct sk_buff *skb = rx->skb;
1373 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1376 * Pass through unencrypted frames if the hardware has
1377 * decrypted them already.
1379 if (status->flag & RX_FLAG_DECRYPTED)
1382 /* Drop unencrypted frames if key is set. */
1383 if (unlikely(!ieee80211_has_protected(fc) &&
1384 !ieee80211_is_nullfunc(fc) &&
1385 ieee80211_is_data(fc) &&
1386 (rx->key || rx->sdata->drop_unencrypted)))
1388 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1389 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1392 /* BIP does not use Protected field, so need to check MMIE */
1393 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1394 ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1398 * When using MFP, Action frames are not allowed prior to
1399 * having configured keys.
1401 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1402 ieee80211_is_robust_mgmt_frame(
1403 (struct ieee80211_hdr *) rx->skb->data)))
1411 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1413 struct ieee80211_sub_if_data *sdata = rx->sdata;
1414 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1416 if (ieee80211_has_a4(hdr->frame_control) &&
1417 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1420 if (is_multicast_ether_addr(hdr->addr1) &&
1421 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1422 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
1425 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1429 * requires that rx->skb is a frame with ethernet header
1431 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1433 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1434 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1435 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1438 * Allow EAPOL frames to us/the PAE group address regardless
1439 * of whether the frame was encrypted or not.
1441 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1442 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1443 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1446 if (ieee80211_802_1x_port_control(rx) ||
1447 ieee80211_drop_unencrypted(rx, fc))
1454 * requires that rx->skb is a frame with ethernet header
1457 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1459 struct ieee80211_sub_if_data *sdata = rx->sdata;
1460 struct net_device *dev = sdata->dev;
1461 struct sk_buff *skb, *xmit_skb;
1462 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1463 struct sta_info *dsta;
1468 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1469 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1470 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1471 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1472 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1473 if (is_multicast_ether_addr(ehdr->h_dest)) {
1475 * send multicast frames both to higher layers in
1476 * local net stack and back to the wireless medium
1478 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1479 if (!xmit_skb && net_ratelimit())
1480 printk(KERN_DEBUG "%s: failed to clone "
1481 "multicast frame\n", dev->name);
1483 dsta = sta_info_get(sdata, skb->data);
1486 * The destination station is associated to
1487 * this AP (in this VLAN), so send the frame
1488 * directly to it and do not pass it to local
1498 int align __maybe_unused;
1500 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1502 * 'align' will only take the values 0 or 2 here
1503 * since all frames are required to be aligned
1504 * to 2-byte boundaries when being passed to
1505 * mac80211. That also explains the __skb_push()
1508 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1510 if (WARN_ON(skb_headroom(skb) < 3)) {
1514 u8 *data = skb->data;
1515 size_t len = skb_headlen(skb);
1517 memmove(skb->data, data, len);
1518 skb_set_tail_pointer(skb, len);
1524 /* deliver to local stack */
1525 skb->protocol = eth_type_trans(skb, dev);
1526 memset(skb->cb, 0, sizeof(skb->cb));
1532 /* send to wireless media */
1533 xmit_skb->protocol = htons(ETH_P_802_3);
1534 skb_reset_network_header(xmit_skb);
1535 skb_reset_mac_header(xmit_skb);
1536 dev_queue_xmit(xmit_skb);
1540 static ieee80211_rx_result debug_noinline
1541 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1543 struct net_device *dev = rx->sdata->dev;
1544 struct sk_buff *skb = rx->skb;
1545 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1546 __le16 fc = hdr->frame_control;
1547 struct sk_buff_head frame_list;
1549 if (unlikely(!ieee80211_is_data(fc)))
1552 if (unlikely(!ieee80211_is_data_present(fc)))
1553 return RX_DROP_MONITOR;
1555 if (!(rx->flags & IEEE80211_RX_AMSDU))
1558 if (ieee80211_has_a4(hdr->frame_control) &&
1559 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1560 !rx->sdata->u.vlan.sta)
1561 return RX_DROP_UNUSABLE;
1563 if (is_multicast_ether_addr(hdr->addr1) &&
1564 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1565 rx->sdata->u.vlan.sta) ||
1566 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1567 rx->sdata->u.mgd.use_4addr)))
1568 return RX_DROP_UNUSABLE;
1571 __skb_queue_head_init(&frame_list);
1573 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1574 rx->sdata->vif.type,
1575 rx->local->hw.extra_tx_headroom);
1577 while (!skb_queue_empty(&frame_list)) {
1578 rx->skb = __skb_dequeue(&frame_list);
1580 if (!ieee80211_frame_allowed(rx, fc)) {
1581 dev_kfree_skb(rx->skb);
1584 dev->stats.rx_packets++;
1585 dev->stats.rx_bytes += rx->skb->len;
1587 ieee80211_deliver_skb(rx);
1593 #ifdef CONFIG_MAC80211_MESH
1594 static ieee80211_rx_result
1595 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1597 struct ieee80211_hdr *hdr;
1598 struct ieee80211s_hdr *mesh_hdr;
1599 unsigned int hdrlen;
1600 struct sk_buff *skb = rx->skb, *fwd_skb;
1601 struct ieee80211_local *local = rx->local;
1602 struct ieee80211_sub_if_data *sdata = rx->sdata;
1604 hdr = (struct ieee80211_hdr *) skb->data;
1605 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1606 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1608 if (!ieee80211_is_data(hdr->frame_control))
1613 return RX_DROP_MONITOR;
1615 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1616 struct mesh_path *mppath;
1620 if (is_multicast_ether_addr(hdr->addr1)) {
1621 mpp_addr = hdr->addr3;
1622 proxied_addr = mesh_hdr->eaddr1;
1624 mpp_addr = hdr->addr4;
1625 proxied_addr = mesh_hdr->eaddr2;
1629 mppath = mpp_path_lookup(proxied_addr, sdata);
1631 mpp_path_add(proxied_addr, mpp_addr, sdata);
1633 spin_lock_bh(&mppath->state_lock);
1634 mppath->exp_time = jiffies;
1635 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1636 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1637 spin_unlock_bh(&mppath->state_lock);
1642 /* Frame has reached destination. Don't forward */
1643 if (!is_multicast_ether_addr(hdr->addr1) &&
1644 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1649 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1651 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1652 dropped_frames_ttl);
1654 struct ieee80211_hdr *fwd_hdr;
1655 struct ieee80211_tx_info *info;
1657 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1659 if (!fwd_skb && net_ratelimit())
1660 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1663 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1664 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1665 info = IEEE80211_SKB_CB(fwd_skb);
1666 memset(info, 0, sizeof(*info));
1667 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1668 info->control.vif = &rx->sdata->vif;
1669 ieee80211_select_queue(local, fwd_skb);
1670 if (is_multicast_ether_addr(fwd_hdr->addr1))
1671 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1676 * Save TA to addr1 to send TA a path error if a
1677 * suitable next hop is not found
1679 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1681 err = mesh_nexthop_lookup(fwd_skb, sdata);
1682 /* Failed to immediately resolve next hop:
1683 * fwded frame was dropped or will be added
1684 * later to the pending skb queue. */
1686 return RX_DROP_MONITOR;
1688 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1691 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1693 ieee80211_add_pending_skb(local, fwd_skb);
1697 if (is_multicast_ether_addr(hdr->addr1) ||
1698 sdata->dev->flags & IFF_PROMISC)
1701 return RX_DROP_MONITOR;
1705 static ieee80211_rx_result debug_noinline
1706 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1708 struct ieee80211_sub_if_data *sdata = rx->sdata;
1709 struct net_device *dev = sdata->dev;
1710 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1711 __le16 fc = hdr->frame_control;
1714 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1717 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1718 return RX_DROP_MONITOR;
1721 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1722 * that a 4-addr station can be detected and moved into a separate VLAN
1724 if (ieee80211_has_a4(hdr->frame_control) &&
1725 sdata->vif.type == NL80211_IFTYPE_AP)
1726 return RX_DROP_MONITOR;
1728 err = __ieee80211_data_to_8023(rx);
1730 return RX_DROP_UNUSABLE;
1732 if (!ieee80211_frame_allowed(rx, fc))
1733 return RX_DROP_MONITOR;
1737 dev->stats.rx_packets++;
1738 dev->stats.rx_bytes += rx->skb->len;
1740 ieee80211_deliver_skb(rx);
1745 static ieee80211_rx_result debug_noinline
1746 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
1748 struct ieee80211_local *local = rx->local;
1749 struct ieee80211_hw *hw = &local->hw;
1750 struct sk_buff *skb = rx->skb;
1751 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1752 struct tid_ampdu_rx *tid_agg_rx;
1756 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1759 if (ieee80211_is_back_req(bar->frame_control)) {
1761 return RX_DROP_MONITOR;
1762 tid = le16_to_cpu(bar->control) >> 12;
1763 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1764 != HT_AGG_STATE_OPERATIONAL)
1765 return RX_DROP_MONITOR;
1766 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1768 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1770 /* reset session timer */
1771 if (tid_agg_rx->timeout)
1772 mod_timer(&tid_agg_rx->session_timer,
1773 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1775 /* release stored frames up to start of BAR */
1776 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1785 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1786 struct ieee80211_mgmt *mgmt,
1789 struct ieee80211_local *local = sdata->local;
1790 struct sk_buff *skb;
1791 struct ieee80211_mgmt *resp;
1793 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
1794 /* Not to own unicast address */
1798 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1799 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1800 /* Not from the current AP or not associated yet. */
1804 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1805 /* Too short SA Query request frame */
1809 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1813 skb_reserve(skb, local->hw.extra_tx_headroom);
1814 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1815 memset(resp, 0, 24);
1816 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1817 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
1818 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1819 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1820 IEEE80211_STYPE_ACTION);
1821 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1822 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1823 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1824 memcpy(resp->u.action.u.sa_query.trans_id,
1825 mgmt->u.action.u.sa_query.trans_id,
1826 WLAN_SA_QUERY_TR_ID_LEN);
1828 ieee80211_tx_skb(sdata, skb);
1831 static ieee80211_rx_result debug_noinline
1832 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1834 struct ieee80211_local *local = rx->local;
1835 struct ieee80211_sub_if_data *sdata = rx->sdata;
1836 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1837 int len = rx->skb->len;
1839 if (!ieee80211_is_action(mgmt->frame_control))
1843 return RX_DROP_MONITOR;
1845 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1846 return RX_DROP_MONITOR;
1848 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1849 return RX_DROP_MONITOR;
1851 /* all categories we currently handle have action_code */
1852 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1853 return RX_DROP_MONITOR;
1855 switch (mgmt->u.action.category) {
1856 case WLAN_CATEGORY_BACK:
1858 * The aggregation code is not prepared to handle
1859 * anything but STA/AP due to the BSSID handling;
1860 * IBSS could work in the code but isn't supported
1861 * by drivers or the standard.
1863 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1864 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1865 sdata->vif.type != NL80211_IFTYPE_AP)
1866 return RX_DROP_MONITOR;
1868 switch (mgmt->u.action.u.addba_req.action_code) {
1869 case WLAN_ACTION_ADDBA_REQ:
1870 if (len < (IEEE80211_MIN_ACTION_SIZE +
1871 sizeof(mgmt->u.action.u.addba_req)))
1872 return RX_DROP_MONITOR;
1873 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1875 case WLAN_ACTION_ADDBA_RESP:
1876 if (len < (IEEE80211_MIN_ACTION_SIZE +
1877 sizeof(mgmt->u.action.u.addba_resp)))
1878 return RX_DROP_MONITOR;
1879 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1881 case WLAN_ACTION_DELBA:
1882 if (len < (IEEE80211_MIN_ACTION_SIZE +
1883 sizeof(mgmt->u.action.u.delba)))
1884 return RX_DROP_MONITOR;
1885 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1889 case WLAN_CATEGORY_SPECTRUM_MGMT:
1890 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1891 return RX_DROP_MONITOR;
1893 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1894 return RX_DROP_MONITOR;
1896 switch (mgmt->u.action.u.measurement.action_code) {
1897 case WLAN_ACTION_SPCT_MSR_REQ:
1898 if (len < (IEEE80211_MIN_ACTION_SIZE +
1899 sizeof(mgmt->u.action.u.measurement)))
1900 return RX_DROP_MONITOR;
1901 ieee80211_process_measurement_req(sdata, mgmt, len);
1903 case WLAN_ACTION_SPCT_CHL_SWITCH:
1904 if (len < (IEEE80211_MIN_ACTION_SIZE +
1905 sizeof(mgmt->u.action.u.chan_switch)))
1906 return RX_DROP_MONITOR;
1908 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1909 return RX_DROP_MONITOR;
1911 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1912 return RX_DROP_MONITOR;
1914 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1917 case WLAN_CATEGORY_SA_QUERY:
1918 if (len < (IEEE80211_MIN_ACTION_SIZE +
1919 sizeof(mgmt->u.action.u.sa_query)))
1920 return RX_DROP_MONITOR;
1921 switch (mgmt->u.action.u.sa_query.action) {
1922 case WLAN_ACTION_SA_QUERY_REQUEST:
1923 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1924 return RX_DROP_MONITOR;
1925 ieee80211_process_sa_query_req(sdata, mgmt, len);
1927 case WLAN_ACTION_SA_QUERY_RESPONSE:
1929 * SA Query response is currently only used in AP mode
1930 * and it is processed in user space.
1939 rx->sta->rx_packets++;
1940 dev_kfree_skb(rx->skb);
1944 static ieee80211_rx_result debug_noinline
1945 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1947 struct ieee80211_sub_if_data *sdata = rx->sdata;
1948 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1950 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1951 return RX_DROP_MONITOR;
1953 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1954 return RX_DROP_MONITOR;
1956 if (ieee80211_vif_is_mesh(&sdata->vif))
1957 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
1959 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
1960 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
1962 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1963 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1965 return RX_DROP_MONITOR;
1968 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
1969 struct ieee80211_rx_data *rx)
1972 unsigned int hdrlen;
1974 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1975 if (rx->skb->len >= hdrlen + 4)
1976 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1982 * Some hardware seem to generate incorrect Michael MIC
1983 * reports; ignore them to avoid triggering countermeasures.
1988 if (!ieee80211_has_protected(hdr->frame_control))
1991 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1993 * APs with pairwise keys should never receive Michael MIC
1994 * errors for non-zero keyidx because these are reserved for
1995 * group keys and only the AP is sending real multicast
1996 * frames in the BSS.
2001 if (!ieee80211_is_data(hdr->frame_control) &&
2002 !ieee80211_is_auth(hdr->frame_control))
2005 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2009 /* TODO: use IEEE80211_RX_FRAGMENTED */
2010 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2011 struct ieee80211_rate *rate)
2013 struct ieee80211_sub_if_data *sdata;
2014 struct ieee80211_local *local = rx->local;
2015 struct ieee80211_rtap_hdr {
2016 struct ieee80211_radiotap_header hdr;
2021 } __attribute__ ((packed)) *rthdr;
2022 struct sk_buff *skb = rx->skb, *skb2;
2023 struct net_device *prev_dev = NULL;
2024 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2026 if (status->flag & RX_FLAG_INTERNAL_CMTR)
2029 if (skb_headroom(skb) < sizeof(*rthdr) &&
2030 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2033 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2034 memset(rthdr, 0, sizeof(*rthdr));
2035 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2036 rthdr->hdr.it_present =
2037 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2038 (1 << IEEE80211_RADIOTAP_CHANNEL));
2041 rthdr->rate_or_pad = rate->bitrate / 5;
2042 rthdr->hdr.it_present |=
2043 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2045 rthdr->chan_freq = cpu_to_le16(status->freq);
2047 if (status->band == IEEE80211_BAND_5GHZ)
2048 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2049 IEEE80211_CHAN_5GHZ);
2051 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2052 IEEE80211_CHAN_2GHZ);
2054 skb_set_mac_header(skb, 0);
2055 skb->ip_summed = CHECKSUM_UNNECESSARY;
2056 skb->pkt_type = PACKET_OTHERHOST;
2057 skb->protocol = htons(ETH_P_802_2);
2059 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2060 if (!netif_running(sdata->dev))
2063 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2064 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2068 skb2 = skb_clone(skb, GFP_ATOMIC);
2070 skb2->dev = prev_dev;
2075 prev_dev = sdata->dev;
2076 sdata->dev->stats.rx_packets++;
2077 sdata->dev->stats.rx_bytes += skb->len;
2081 skb->dev = prev_dev;
2087 status->flag |= RX_FLAG_INTERNAL_CMTR;
2095 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
2096 struct ieee80211_rx_data *rx,
2097 struct sk_buff *skb,
2098 struct ieee80211_rate *rate)
2100 struct sk_buff_head reorder_release;
2101 ieee80211_rx_result res = RX_DROP_MONITOR;
2103 __skb_queue_head_init(&reorder_release);
2108 #define CALL_RXH(rxh) \
2111 if (res != RX_CONTINUE) \
2116 * NB: the rxh_next label works even if we jump
2117 * to it from here because then the list will
2118 * be empty, which is a trivial check
2120 CALL_RXH(ieee80211_rx_h_passive_scan)
2121 CALL_RXH(ieee80211_rx_h_check)
2123 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2125 while ((skb = __skb_dequeue(&reorder_release))) {
2127 * all the other fields are valid across frames
2128 * that belong to an aMPDU since they are on the
2129 * same TID from the same station
2133 CALL_RXH(ieee80211_rx_h_decrypt)
2134 CALL_RXH(ieee80211_rx_h_check_more_data)
2135 CALL_RXH(ieee80211_rx_h_sta_process)
2136 CALL_RXH(ieee80211_rx_h_defragment)
2137 CALL_RXH(ieee80211_rx_h_ps_poll)
2138 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2139 /* must be after MMIC verify so header is counted in MPDU mic */
2140 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2141 CALL_RXH(ieee80211_rx_h_amsdu)
2142 #ifdef CONFIG_MAC80211_MESH
2143 if (ieee80211_vif_is_mesh(&sdata->vif))
2144 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2146 CALL_RXH(ieee80211_rx_h_data)
2148 /* special treatment -- needs the queue */
2149 res = ieee80211_rx_h_ctrl(rx, &reorder_release);
2150 if (res != RX_CONTINUE)
2153 CALL_RXH(ieee80211_rx_h_action)
2154 CALL_RXH(ieee80211_rx_h_mgmt)
2160 case RX_DROP_MONITOR:
2161 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2163 rx->sta->rx_dropped++;
2166 ieee80211_rx_cooked_monitor(rx, rate);
2168 case RX_DROP_UNUSABLE:
2169 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2171 rx->sta->rx_dropped++;
2172 dev_kfree_skb(rx->skb);
2175 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2181 /* main receive path */
2183 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2184 struct ieee80211_rx_data *rx,
2185 struct ieee80211_hdr *hdr)
2187 struct sk_buff *skb = rx->skb;
2188 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2189 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2190 int multicast = is_multicast_ether_addr(hdr->addr1);
2192 switch (sdata->vif.type) {
2193 case NL80211_IFTYPE_STATION:
2194 if (!bssid && !sdata->u.mgd.use_4addr)
2197 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2198 if (!(sdata->dev->flags & IFF_PROMISC))
2200 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2203 case NL80211_IFTYPE_ADHOC:
2206 if (ieee80211_is_beacon(hdr->frame_control)) {
2209 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2210 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2212 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2213 } else if (!multicast &&
2214 compare_ether_addr(sdata->vif.addr,
2216 if (!(sdata->dev->flags & IFF_PROMISC))
2218 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2219 } else if (!rx->sta) {
2221 if (status->flag & RX_FLAG_HT)
2222 rate_idx = 0; /* TODO: HT rates */
2224 rate_idx = status->rate_idx;
2225 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2229 case NL80211_IFTYPE_MESH_POINT:
2231 compare_ether_addr(sdata->vif.addr,
2233 if (!(sdata->dev->flags & IFF_PROMISC))
2236 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2239 case NL80211_IFTYPE_AP_VLAN:
2240 case NL80211_IFTYPE_AP:
2242 if (compare_ether_addr(sdata->vif.addr,
2245 } else if (!ieee80211_bssid_match(bssid,
2247 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2249 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2252 case NL80211_IFTYPE_WDS:
2253 if (bssid || !ieee80211_is_data(hdr->frame_control))
2255 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2258 case NL80211_IFTYPE_MONITOR:
2259 case NL80211_IFTYPE_UNSPECIFIED:
2260 case __NL80211_IFTYPE_AFTER_LAST:
2261 /* should never get here */
2270 * This is the actual Rx frames handler. as it blongs to Rx path it must
2271 * be called with rcu_read_lock protection.
2273 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2274 struct sk_buff *skb,
2275 struct ieee80211_rate *rate)
2277 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2278 struct ieee80211_local *local = hw_to_local(hw);
2279 struct ieee80211_sub_if_data *sdata;
2280 struct ieee80211_hdr *hdr;
2281 struct ieee80211_rx_data rx;
2283 struct ieee80211_sub_if_data *prev = NULL;
2284 struct sk_buff *skb_new;
2285 struct sta_info *sta, *tmp;
2286 bool found_sta = false;
2288 hdr = (struct ieee80211_hdr *)skb->data;
2289 memset(&rx, 0, sizeof(rx));
2293 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2294 local->dot11ReceivedFragmentCount++;
2296 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2297 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2298 rx.flags |= IEEE80211_RX_IN_SCAN;
2300 ieee80211_parse_qos(&rx);
2301 ieee80211_verify_alignment(&rx);
2303 if (ieee80211_is_data(hdr->frame_control)) {
2304 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2307 rx.sdata = sta->sdata;
2309 rx.flags |= IEEE80211_RX_RA_MATCH;
2310 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2312 if (status->flag & RX_FLAG_MMIC_ERROR) {
2313 if (rx.flags & IEEE80211_RX_RA_MATCH)
2314 ieee80211_rx_michael_mic_report(hdr, &rx);
2321 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2322 if (!netif_running(sdata->dev))
2325 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2326 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2329 rx.sta = sta_info_get(sdata, hdr->addr2);
2331 rx.flags |= IEEE80211_RX_RA_MATCH;
2332 prepares = prepare_for_handlers(sdata, &rx, hdr);
2337 if (status->flag & RX_FLAG_MMIC_ERROR) {
2339 if (rx.flags & IEEE80211_RX_RA_MATCH)
2340 ieee80211_rx_michael_mic_report(hdr,
2346 * frame is destined for this interface, but if it's
2347 * not also for the previous one we handle that after
2348 * the loop to avoid copying the SKB once too much
2357 * frame was destined for the previous interface
2358 * so invoke RX handlers for it
2361 skb_new = skb_copy(skb, GFP_ATOMIC);
2363 if (net_ratelimit())
2364 printk(KERN_DEBUG "%s: failed to copy "
2365 "multicast frame for %s\n",
2366 wiphy_name(local->hw.wiphy),
2370 ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate);
2375 ieee80211_invoke_rx_handlers(prev, &rx, skb, rate);
2381 * This is the receive path handler. It is called by a low level driver when an
2382 * 802.11 MPDU is received from the hardware.
2384 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2386 struct ieee80211_local *local = hw_to_local(hw);
2387 struct ieee80211_rate *rate = NULL;
2388 struct ieee80211_supported_band *sband;
2389 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2391 WARN_ON_ONCE(softirq_count() == 0);
2393 if (WARN_ON(status->band < 0 ||
2394 status->band >= IEEE80211_NUM_BANDS))
2397 sband = local->hw.wiphy->bands[status->band];
2398 if (WARN_ON(!sband))
2402 * If we're suspending, it is possible although not too likely
2403 * that we'd be receiving frames after having already partially
2404 * quiesced the stack. We can't process such frames then since
2405 * that might, for example, cause stations to be added or other
2406 * driver callbacks be invoked.
2408 if (unlikely(local->quiescing || local->suspended))
2412 * The same happens when we're not even started,
2413 * but that's worth a warning.
2415 if (WARN_ON(!local->started))
2418 if (status->flag & RX_FLAG_HT) {
2420 * rate_idx is MCS index, which can be [0-76] as documented on:
2422 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2424 * Anything else would be some sort of driver or hardware error.
2425 * The driver should catch hardware errors.
2427 if (WARN((status->rate_idx < 0 ||
2428 status->rate_idx > 76),
2429 "Rate marked as an HT rate but passed "
2430 "status->rate_idx is not "
2431 "an MCS index [0-76]: %d (0x%02x)\n",
2436 if (WARN_ON(status->rate_idx < 0 ||
2437 status->rate_idx >= sband->n_bitrates))
2439 rate = &sband->bitrates[status->rate_idx];
2443 * key references and virtual interfaces are protected using RCU
2444 * and this requires that we are in a read-side RCU section during
2445 * receive processing
2450 * Frames with failed FCS/PLCP checksum are not returned,
2451 * all other frames are returned without radiotap header
2452 * if it was previously present.
2453 * Also, frames with less than 16 bytes are dropped.
2455 skb = ieee80211_rx_monitor(local, skb, rate);
2461 __ieee80211_rx_handle_packet(hw, skb, rate);
2469 EXPORT_SYMBOL(ieee80211_rx);
2471 /* This is a version of the rx handler that can be called from hard irq
2472 * context. Post the skb on the queue and schedule the tasklet */
2473 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2475 struct ieee80211_local *local = hw_to_local(hw);
2477 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2479 skb->pkt_type = IEEE80211_RX_MSG;
2480 skb_queue_tail(&local->skb_queue, skb);
2481 tasklet_schedule(&local->tasklet);
2483 EXPORT_SYMBOL(ieee80211_rx_irqsafe);