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;
318 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
321 /* does the frame have a qos control field? */
322 if (ieee80211_is_data_qos(hdr->frame_control)) {
323 u8 *qc = ieee80211_get_qos_ctl(hdr);
324 /* frame has qos control */
325 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
326 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
327 status->rx_flags |= IEEE80211_RX_AMSDU;
330 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
332 * Sequence numbers for management frames, QoS data
333 * frames with a broadcast/multicast address in the
334 * Address 1 field, and all non-QoS data frames sent
335 * by QoS STAs are assigned using an additional single
336 * modulo-4096 counter, [...]
338 * We also use that counter for non-QoS STAs.
340 tid = NUM_RX_DATA_QUEUES - 1;
344 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
345 * For now, set skb->priority to 0 for other cases. */
346 rx->skb->priority = (tid > 7) ? 0 : tid;
350 * DOC: Packet alignment
352 * Drivers always need to pass packets that are aligned to two-byte boundaries
355 * Additionally, should, if possible, align the payload data in a way that
356 * guarantees that the contained IP header is aligned to a four-byte
357 * boundary. In the case of regular frames, this simply means aligning the
358 * payload to a four-byte boundary (because either the IP header is directly
359 * contained, or IV/RFC1042 headers that have a length divisible by four are
360 * in front of it). If the payload data is not properly aligned and the
361 * architecture doesn't support efficient unaligned operations, mac80211
362 * will align the data.
364 * With A-MSDU frames, however, the payload data address must yield two modulo
365 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
366 * push the IP header further back to a multiple of four again. Thankfully, the
367 * specs were sane enough this time around to require padding each A-MSDU
368 * subframe to a length that is a multiple of four.
370 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
371 * the payload is not supported, the driver is required to move the 802.11
372 * header to be directly in front of the payload in that case.
374 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
376 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
377 WARN_ONCE((unsigned long)rx->skb->data & 1,
378 "unaligned packet at 0x%p\n", rx->skb->data);
385 static ieee80211_rx_result debug_noinline
386 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
388 struct ieee80211_local *local = rx->local;
389 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
390 struct sk_buff *skb = rx->skb;
392 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
395 if (test_bit(SCAN_HW_SCANNING, &local->scanning))
396 return ieee80211_scan_rx(rx->sdata, skb);
398 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
399 /* drop all the other packets during a software scan anyway */
400 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
405 /* scanning finished during invoking of handlers */
406 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
407 return RX_DROP_UNUSABLE;
411 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
413 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
415 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
418 return ieee80211_is_robust_mgmt_frame(hdr);
422 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
424 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
426 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
429 return ieee80211_is_robust_mgmt_frame(hdr);
433 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
434 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
436 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
437 struct ieee80211_mmie *mmie;
439 if (skb->len < 24 + sizeof(*mmie) ||
440 !is_multicast_ether_addr(hdr->da))
443 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
444 return -1; /* not a robust management frame */
446 mmie = (struct ieee80211_mmie *)
447 (skb->data + skb->len - sizeof(*mmie));
448 if (mmie->element_id != WLAN_EID_MMIE ||
449 mmie->length != sizeof(*mmie) - 2)
452 return le16_to_cpu(mmie->key_id);
456 static ieee80211_rx_result
457 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
459 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
460 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
461 char *dev_addr = rx->sdata->vif.addr;
463 if (ieee80211_is_data(hdr->frame_control)) {
464 if (is_multicast_ether_addr(hdr->addr1)) {
465 if (ieee80211_has_tods(hdr->frame_control) ||
466 !ieee80211_has_fromds(hdr->frame_control))
467 return RX_DROP_MONITOR;
468 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
469 return RX_DROP_MONITOR;
471 if (!ieee80211_has_a4(hdr->frame_control))
472 return RX_DROP_MONITOR;
473 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
474 return RX_DROP_MONITOR;
478 /* If there is not an established peer link and this is not a peer link
479 * establisment frame, beacon or probe, drop the frame.
482 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
483 struct ieee80211_mgmt *mgmt;
485 if (!ieee80211_is_mgmt(hdr->frame_control))
486 return RX_DROP_MONITOR;
488 if (ieee80211_is_action(hdr->frame_control)) {
489 mgmt = (struct ieee80211_mgmt *)hdr;
490 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
491 return RX_DROP_MONITOR;
495 if (ieee80211_is_probe_req(hdr->frame_control) ||
496 ieee80211_is_probe_resp(hdr->frame_control) ||
497 ieee80211_is_beacon(hdr->frame_control))
500 return RX_DROP_MONITOR;
504 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
506 if (ieee80211_is_data(hdr->frame_control) &&
507 is_multicast_ether_addr(hdr->addr1) &&
508 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
509 return RX_DROP_MONITOR;
515 #define SEQ_MODULO 0x1000
516 #define SEQ_MASK 0xfff
518 static inline int seq_less(u16 sq1, u16 sq2)
520 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
523 static inline u16 seq_inc(u16 sq)
525 return (sq + 1) & SEQ_MASK;
528 static inline u16 seq_sub(u16 sq1, u16 sq2)
530 return (sq1 - sq2) & SEQ_MASK;
534 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
535 struct tid_ampdu_rx *tid_agg_rx,
537 struct sk_buff_head *frames)
539 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
541 lockdep_assert_held(&tid_agg_rx->reorder_lock);
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 lockdep_assert_held(&tid_agg_rx->reorder_lock);
564 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
565 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
566 tid_agg_rx->buf_size;
567 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
572 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
573 * the skb was added to the buffer longer than this time ago, the earlier
574 * frames that have not yet been received are assumed to be lost and the skb
575 * can be released for processing. This may also release other skb's from the
576 * reorder buffer if there are no additional gaps between the frames.
578 * Callers must hold tid_agg_rx->reorder_lock.
580 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
582 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
583 struct tid_ampdu_rx *tid_agg_rx,
584 struct sk_buff_head *frames)
588 lockdep_assert_held(&tid_agg_rx->reorder_lock);
590 /* release the buffer until next missing frame */
591 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
592 tid_agg_rx->buf_size;
593 if (!tid_agg_rx->reorder_buf[index] &&
594 tid_agg_rx->stored_mpdu_num > 1) {
596 * No buffers ready to be released, but check whether any
597 * frames in the reorder buffer have timed out.
600 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
601 j = (j + 1) % tid_agg_rx->buf_size) {
602 if (!tid_agg_rx->reorder_buf[j]) {
606 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
607 HT_RX_REORDER_BUF_TIMEOUT))
608 goto set_release_timer;
610 #ifdef CONFIG_MAC80211_HT_DEBUG
612 wiphy_debug(hw->wiphy,
613 "release an RX reorder frame due to timeout on earlier frames\n");
615 ieee80211_release_reorder_frame(hw, tid_agg_rx,
619 * Increment the head seq# also for the skipped slots.
621 tid_agg_rx->head_seq_num =
622 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
625 } else while (tid_agg_rx->reorder_buf[index]) {
626 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
627 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
628 tid_agg_rx->buf_size;
632 * Disable the reorder release timer for now.
634 * The current implementation lacks a proper locking scheme
635 * which would protect vital statistic and debug counters
636 * from being updated by two different but concurrent BHs.
638 * More information about the topic is available from:
639 * - thread: http://marc.info/?t=128635927000001
642 * => http://marc.info/?l=linux-wireless&m=128636170811964
643 * "Basically the thing is that until your patch, the data
644 * in the struct didn't actually need locking because it
645 * was accessed by the RX path only which is not concurrent."
647 * List of what needs to be fixed:
648 * => http://marc.info/?l=linux-wireless&m=128656352920957
651 if (tid_agg_rx->stored_mpdu_num) {
652 j = index = seq_sub(tid_agg_rx->head_seq_num,
653 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
655 for (; j != (index - 1) % tid_agg_rx->buf_size;
656 j = (j + 1) % tid_agg_rx->buf_size) {
657 if (tid_agg_rx->reorder_buf[j])
663 mod_timer(&tid_agg_rx->reorder_timer,
664 tid_agg_rx->reorder_time[j] +
665 HT_RX_REORDER_BUF_TIMEOUT);
667 del_timer(&tid_agg_rx->reorder_timer);
676 * As this function belongs to the RX path it must be under
677 * rcu_read_lock protection. It returns false if the frame
678 * can be processed immediately, true if it was consumed.
680 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
681 struct tid_ampdu_rx *tid_agg_rx,
683 struct sk_buff_head *frames)
685 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
686 u16 sc = le16_to_cpu(hdr->seq_ctrl);
687 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
688 u16 head_seq_num, buf_size;
692 spin_lock(&tid_agg_rx->reorder_lock);
694 buf_size = tid_agg_rx->buf_size;
695 head_seq_num = tid_agg_rx->head_seq_num;
697 /* frame with out of date sequence number */
698 if (seq_less(mpdu_seq_num, head_seq_num)) {
704 * If frame the sequence number exceeds our buffering window
705 * size release some previous frames to make room for this one.
707 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
708 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
709 /* release stored frames up to new head to stack */
710 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
714 /* Now the new frame is always in the range of the reordering buffer */
716 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
718 /* check if we already stored this frame */
719 if (tid_agg_rx->reorder_buf[index]) {
725 * If the current MPDU is in the right order and nothing else
726 * is stored we can process it directly, no need to buffer it.
728 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
729 tid_agg_rx->stored_mpdu_num == 0) {
730 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
735 /* put the frame in the reordering buffer */
736 tid_agg_rx->reorder_buf[index] = skb;
737 tid_agg_rx->reorder_time[index] = jiffies;
738 tid_agg_rx->stored_mpdu_num++;
739 ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
742 spin_unlock(&tid_agg_rx->reorder_lock);
747 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
748 * true if the MPDU was buffered, false if it should be processed.
750 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
751 struct sk_buff_head *frames)
753 struct sk_buff *skb = rx->skb;
754 struct ieee80211_local *local = rx->local;
755 struct ieee80211_hw *hw = &local->hw;
756 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
757 struct sta_info *sta = rx->sta;
758 struct tid_ampdu_rx *tid_agg_rx;
762 if (!ieee80211_is_data_qos(hdr->frame_control))
766 * filter the QoS data rx stream according to
767 * STA/TID and check if this STA/TID is on aggregation
773 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
775 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
779 /* qos null data frames are excluded */
780 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
783 /* new, potentially un-ordered, ampdu frame - process it */
785 /* reset session timer */
786 if (tid_agg_rx->timeout)
787 mod_timer(&tid_agg_rx->session_timer,
788 TU_TO_EXP_TIME(tid_agg_rx->timeout));
790 /* if this mpdu is fragmented - terminate rx aggregation session */
791 sc = le16_to_cpu(hdr->seq_ctrl);
792 if (sc & IEEE80211_SCTL_FRAG) {
793 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
794 skb_queue_tail(&rx->sdata->skb_queue, skb);
795 ieee80211_queue_work(&local->hw, &rx->sdata->work);
800 * No locking needed -- we will only ever process one
801 * RX packet at a time, and thus own tid_agg_rx. All
802 * other code manipulating it needs to (and does) make
803 * sure that we cannot get to it any more before doing
806 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
810 __skb_queue_tail(frames, skb);
813 static ieee80211_rx_result debug_noinline
814 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
816 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
817 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
819 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
820 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
821 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
822 rx->sta->last_seq_ctrl[rx->queue] ==
824 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
825 rx->local->dot11FrameDuplicateCount++;
826 rx->sta->num_duplicates++;
828 return RX_DROP_MONITOR;
830 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
833 if (unlikely(rx->skb->len < 16)) {
834 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
835 return RX_DROP_MONITOR;
838 /* Drop disallowed frame classes based on STA auth/assoc state;
839 * IEEE 802.11, Chap 5.5.
841 * mac80211 filters only based on association state, i.e. it drops
842 * Class 3 frames from not associated stations. hostapd sends
843 * deauth/disassoc frames when needed. In addition, hostapd is
844 * responsible for filtering on both auth and assoc states.
847 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
848 return ieee80211_rx_mesh_check(rx);
850 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
851 ieee80211_is_pspoll(hdr->frame_control)) &&
852 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
853 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
854 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
855 if ((!ieee80211_has_fromds(hdr->frame_control) &&
856 !ieee80211_has_tods(hdr->frame_control) &&
857 ieee80211_is_data(hdr->frame_control)) ||
858 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
859 /* Drop IBSS frames and frames for other hosts
861 return RX_DROP_MONITOR;
864 return RX_DROP_MONITOR;
871 static ieee80211_rx_result debug_noinline
872 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
874 struct sk_buff *skb = rx->skb;
875 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
876 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
879 ieee80211_rx_result result = RX_DROP_UNUSABLE;
880 struct ieee80211_key *sta_ptk = NULL;
881 int mmie_keyidx = -1;
887 * There are four types of keys:
889 * - IGTK (group keys for management frames)
890 * - PTK (pairwise keys)
891 * - STK (station-to-station pairwise keys)
893 * When selecting a key, we have to distinguish between multicast
894 * (including broadcast) and unicast frames, the latter can only
895 * use PTKs and STKs while the former always use GTKs and IGTKs.
896 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
897 * unicast frames can also use key indices like GTKs. Hence, if we
898 * don't have a PTK/STK we check the key index for a WEP key.
900 * Note that in a regular BSS, multicast frames are sent by the
901 * AP only, associated stations unicast the frame to the AP first
902 * which then multicasts it on their behalf.
904 * There is also a slight problem in IBSS mode: GTKs are negotiated
905 * with each station, that is something we don't currently handle.
906 * The spec seems to expect that one negotiates the same key with
907 * every station but there's no such requirement; VLANs could be
912 * No point in finding a key and decrypting if the frame is neither
913 * addressed to us nor a multicast frame.
915 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
918 /* start without a key */
922 sta_ptk = rcu_dereference(rx->sta->ptk);
924 fc = hdr->frame_control;
926 if (!ieee80211_has_protected(fc))
927 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
929 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
931 if ((status->flag & RX_FLAG_DECRYPTED) &&
932 (status->flag & RX_FLAG_IV_STRIPPED))
934 /* Skip decryption if the frame is not protected. */
935 if (!ieee80211_has_protected(fc))
937 } else if (mmie_keyidx >= 0) {
938 /* Broadcast/multicast robust management frame / BIP */
939 if ((status->flag & RX_FLAG_DECRYPTED) &&
940 (status->flag & RX_FLAG_IV_STRIPPED))
943 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
944 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
945 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
947 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
949 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
950 } else if (!ieee80211_has_protected(fc)) {
952 * The frame was not protected, so skip decryption. However, we
953 * need to set rx->key if there is a key that could have been
954 * used so that the frame may be dropped if encryption would
955 * have been expected.
957 struct ieee80211_key *key = NULL;
958 if (ieee80211_is_mgmt(fc) &&
959 is_multicast_ether_addr(hdr->addr1) &&
960 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
962 else if ((key = rcu_dereference(rx->sdata->default_key)))
968 * The device doesn't give us the IV so we won't be
969 * able to look up the key. That's ok though, we
970 * don't need to decrypt the frame, we just won't
971 * be able to keep statistics accurate.
972 * Except for key threshold notifications, should
973 * we somehow allow the driver to tell us which key
974 * the hardware used if this flag is set?
976 if ((status->flag & RX_FLAG_DECRYPTED) &&
977 (status->flag & RX_FLAG_IV_STRIPPED))
980 hdrlen = ieee80211_hdrlen(fc);
982 if (rx->skb->len < 8 + hdrlen)
983 return RX_DROP_UNUSABLE; /* TODO: count this? */
986 * no need to call ieee80211_wep_get_keyidx,
987 * it verifies a bunch of things we've done already
989 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
992 /* check per-station GTK first, if multicast packet */
993 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
994 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
996 /* if not found, try default key */
998 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1001 * RSNA-protected unicast frames should always be
1002 * sent with pairwise or station-to-station keys,
1003 * but for WEP we allow using a key index as well.
1006 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1007 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1008 !is_multicast_ether_addr(hdr->addr1))
1014 rx->key->tx_rx_count++;
1015 /* TODO: add threshold stuff again */
1017 return RX_DROP_MONITOR;
1020 if (skb_linearize(rx->skb))
1021 return RX_DROP_UNUSABLE;
1022 /* the hdr variable is invalid now! */
1024 switch (rx->key->conf.cipher) {
1025 case WLAN_CIPHER_SUITE_WEP40:
1026 case WLAN_CIPHER_SUITE_WEP104:
1027 /* Check for weak IVs if possible */
1028 if (rx->sta && ieee80211_is_data(fc) &&
1029 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1030 !(status->flag & RX_FLAG_DECRYPTED)) &&
1031 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1032 rx->sta->wep_weak_iv_count++;
1034 result = ieee80211_crypto_wep_decrypt(rx);
1036 case WLAN_CIPHER_SUITE_TKIP:
1037 result = ieee80211_crypto_tkip_decrypt(rx);
1039 case WLAN_CIPHER_SUITE_CCMP:
1040 result = ieee80211_crypto_ccmp_decrypt(rx);
1042 case WLAN_CIPHER_SUITE_AES_CMAC:
1043 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1047 * We can reach here only with HW-only algorithms
1048 * but why didn't it decrypt the frame?!
1050 return RX_DROP_UNUSABLE;
1053 /* either the frame has been decrypted or will be dropped */
1054 status->flag |= RX_FLAG_DECRYPTED;
1059 static ieee80211_rx_result debug_noinline
1060 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1062 struct ieee80211_local *local;
1063 struct ieee80211_hdr *hdr;
1064 struct sk_buff *skb;
1068 hdr = (struct ieee80211_hdr *) skb->data;
1070 if (!local->pspolling)
1073 if (!ieee80211_has_fromds(hdr->frame_control))
1074 /* this is not from AP */
1077 if (!ieee80211_is_data(hdr->frame_control))
1080 if (!ieee80211_has_moredata(hdr->frame_control)) {
1081 /* AP has no more frames buffered for us */
1082 local->pspolling = false;
1086 /* more data bit is set, let's request a new frame from the AP */
1087 ieee80211_send_pspoll(local, rx->sdata);
1092 static void ap_sta_ps_start(struct sta_info *sta)
1094 struct ieee80211_sub_if_data *sdata = sta->sdata;
1095 struct ieee80211_local *local = sdata->local;
1097 atomic_inc(&sdata->bss->num_sta_ps);
1098 set_sta_flags(sta, WLAN_STA_PS_STA);
1099 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1100 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1101 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1102 sdata->name, sta->sta.addr, sta->sta.aid);
1103 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1106 static void ap_sta_ps_end(struct sta_info *sta)
1108 struct ieee80211_sub_if_data *sdata = sta->sdata;
1110 atomic_dec(&sdata->bss->num_sta_ps);
1112 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1113 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1114 sdata->name, sta->sta.addr, sta->sta.aid);
1115 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1117 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
1118 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1119 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1120 sdata->name, sta->sta.addr, sta->sta.aid);
1121 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1125 ieee80211_sta_ps_deliver_wakeup(sta);
1128 static ieee80211_rx_result debug_noinline
1129 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1131 struct sta_info *sta = rx->sta;
1132 struct sk_buff *skb = rx->skb;
1133 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1134 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1140 * Update last_rx only for IBSS packets which are for the current
1141 * BSSID to avoid keeping the current IBSS network alive in cases
1142 * where other STAs start using different BSSID.
1144 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1145 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1146 NL80211_IFTYPE_ADHOC);
1147 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
1148 sta->last_rx = jiffies;
1149 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1151 * Mesh beacons will update last_rx when if they are found to
1152 * match the current local configuration when processed.
1154 sta->last_rx = jiffies;
1157 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1160 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1161 ieee80211_sta_rx_notify(rx->sdata, hdr);
1163 sta->rx_fragments++;
1164 sta->rx_bytes += rx->skb->len;
1165 sta->last_signal = status->signal;
1168 * Change STA power saving mode only at the end of a frame
1169 * exchange sequence.
1171 if (!ieee80211_has_morefrags(hdr->frame_control) &&
1172 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1173 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1174 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
1176 * Ignore doze->wake transitions that are
1177 * indicated by non-data frames, the standard
1178 * is unclear here, but for example going to
1179 * PS mode and then scanning would cause a
1180 * doze->wake transition for the probe request,
1181 * and that is clearly undesirable.
1183 if (ieee80211_is_data(hdr->frame_control) &&
1184 !ieee80211_has_pm(hdr->frame_control))
1187 if (ieee80211_has_pm(hdr->frame_control))
1188 ap_sta_ps_start(sta);
1193 * Drop (qos-)data::nullfunc frames silently, since they
1194 * are used only to control station power saving mode.
1196 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1197 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1198 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1201 * If we receive a 4-addr nullfunc frame from a STA
1202 * that was not moved to a 4-addr STA vlan yet, drop
1203 * the frame to the monitor interface, to make sure
1204 * that hostapd sees it
1206 if (ieee80211_has_a4(hdr->frame_control) &&
1207 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1208 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1209 !rx->sdata->u.vlan.sta)))
1210 return RX_DROP_MONITOR;
1212 * Update counter and free packet here to avoid
1213 * counting this as a dropped packed.
1216 dev_kfree_skb(rx->skb);
1221 } /* ieee80211_rx_h_sta_process */
1223 static inline struct ieee80211_fragment_entry *
1224 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1225 unsigned int frag, unsigned int seq, int rx_queue,
1226 struct sk_buff **skb)
1228 struct ieee80211_fragment_entry *entry;
1231 idx = sdata->fragment_next;
1232 entry = &sdata->fragments[sdata->fragment_next++];
1233 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1234 sdata->fragment_next = 0;
1236 if (!skb_queue_empty(&entry->skb_list)) {
1237 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1238 struct ieee80211_hdr *hdr =
1239 (struct ieee80211_hdr *) entry->skb_list.next->data;
1240 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1241 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1242 "addr1=%pM addr2=%pM\n",
1244 jiffies - entry->first_frag_time, entry->seq,
1245 entry->last_frag, hdr->addr1, hdr->addr2);
1247 __skb_queue_purge(&entry->skb_list);
1250 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1252 entry->first_frag_time = jiffies;
1254 entry->rx_queue = rx_queue;
1255 entry->last_frag = frag;
1257 entry->extra_len = 0;
1262 static inline struct ieee80211_fragment_entry *
1263 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1264 unsigned int frag, unsigned int seq,
1265 int rx_queue, struct ieee80211_hdr *hdr)
1267 struct ieee80211_fragment_entry *entry;
1270 idx = sdata->fragment_next;
1271 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1272 struct ieee80211_hdr *f_hdr;
1276 idx = IEEE80211_FRAGMENT_MAX - 1;
1278 entry = &sdata->fragments[idx];
1279 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1280 entry->rx_queue != rx_queue ||
1281 entry->last_frag + 1 != frag)
1284 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1287 * Check ftype and addresses are equal, else check next fragment
1289 if (((hdr->frame_control ^ f_hdr->frame_control) &
1290 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1291 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1292 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1295 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1296 __skb_queue_purge(&entry->skb_list);
1305 static ieee80211_rx_result debug_noinline
1306 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1308 struct ieee80211_hdr *hdr;
1311 unsigned int frag, seq;
1312 struct ieee80211_fragment_entry *entry;
1313 struct sk_buff *skb;
1314 struct ieee80211_rx_status *status;
1316 hdr = (struct ieee80211_hdr *)rx->skb->data;
1317 fc = hdr->frame_control;
1318 sc = le16_to_cpu(hdr->seq_ctrl);
1319 frag = sc & IEEE80211_SCTL_FRAG;
1321 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1322 (rx->skb)->len < 24 ||
1323 is_multicast_ether_addr(hdr->addr1))) {
1324 /* not fragmented */
1327 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1329 if (skb_linearize(rx->skb))
1330 return RX_DROP_UNUSABLE;
1333 * skb_linearize() might change the skb->data and
1334 * previously cached variables (in this case, hdr) need to
1335 * be refreshed with the new data.
1337 hdr = (struct ieee80211_hdr *)rx->skb->data;
1338 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1341 /* This is the first fragment of a new frame. */
1342 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1343 rx->queue, &(rx->skb));
1344 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1345 ieee80211_has_protected(fc)) {
1346 int queue = ieee80211_is_mgmt(fc) ?
1347 NUM_RX_DATA_QUEUES : rx->queue;
1348 /* Store CCMP PN so that we can verify that the next
1349 * fragment has a sequential PN value. */
1351 memcpy(entry->last_pn,
1352 rx->key->u.ccmp.rx_pn[queue],
1358 /* This is a fragment for a frame that should already be pending in
1359 * fragment cache. Add this fragment to the end of the pending entry.
1361 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1363 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1364 return RX_DROP_MONITOR;
1367 /* Verify that MPDUs within one MSDU have sequential PN values.
1368 * (IEEE 802.11i, 8.3.3.4.5) */
1371 u8 pn[CCMP_PN_LEN], *rpn;
1373 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1374 return RX_DROP_UNUSABLE;
1375 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1376 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1381 queue = ieee80211_is_mgmt(fc) ?
1382 NUM_RX_DATA_QUEUES : rx->queue;
1383 rpn = rx->key->u.ccmp.rx_pn[queue];
1384 if (memcmp(pn, rpn, CCMP_PN_LEN))
1385 return RX_DROP_UNUSABLE;
1386 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1389 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1390 __skb_queue_tail(&entry->skb_list, rx->skb);
1391 entry->last_frag = frag;
1392 entry->extra_len += rx->skb->len;
1393 if (ieee80211_has_morefrags(fc)) {
1398 rx->skb = __skb_dequeue(&entry->skb_list);
1399 if (skb_tailroom(rx->skb) < entry->extra_len) {
1400 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1401 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1403 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1404 __skb_queue_purge(&entry->skb_list);
1405 return RX_DROP_UNUSABLE;
1408 while ((skb = __skb_dequeue(&entry->skb_list))) {
1409 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1413 /* Complete frame has been reassembled - process it now */
1414 status = IEEE80211_SKB_RXCB(rx->skb);
1415 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1419 rx->sta->rx_packets++;
1420 if (is_multicast_ether_addr(hdr->addr1))
1421 rx->local->dot11MulticastReceivedFrameCount++;
1423 ieee80211_led_rx(rx->local);
1427 static ieee80211_rx_result debug_noinline
1428 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1430 struct ieee80211_sub_if_data *sdata = rx->sdata;
1431 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1432 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1434 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1435 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
1438 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1439 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1440 return RX_DROP_UNUSABLE;
1442 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1443 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1445 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1447 /* Free PS Poll skb here instead of returning RX_DROP that would
1448 * count as an dropped frame. */
1449 dev_kfree_skb(rx->skb);
1454 static ieee80211_rx_result debug_noinline
1455 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1457 u8 *data = rx->skb->data;
1458 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1460 if (!ieee80211_is_data_qos(hdr->frame_control))
1463 /* remove the qos control field, update frame type and meta-data */
1464 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1465 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1466 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1467 /* change frame type to non QOS */
1468 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1474 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1476 if (unlikely(!rx->sta ||
1477 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1484 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1486 struct sk_buff *skb = rx->skb;
1487 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1490 * Pass through unencrypted frames if the hardware has
1491 * decrypted them already.
1493 if (status->flag & RX_FLAG_DECRYPTED)
1496 /* Drop unencrypted frames if key is set. */
1497 if (unlikely(!ieee80211_has_protected(fc) &&
1498 !ieee80211_is_nullfunc(fc) &&
1499 ieee80211_is_data(fc) &&
1500 (rx->key || rx->sdata->drop_unencrypted)))
1507 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1509 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1510 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1511 __le16 fc = hdr->frame_control;
1514 * Pass through unencrypted frames if the hardware has
1515 * decrypted them already.
1517 if (status->flag & RX_FLAG_DECRYPTED)
1520 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1521 if (unlikely(!ieee80211_has_protected(fc) &&
1522 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1525 /* BIP does not use Protected field, so need to check MMIE */
1526 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1527 ieee80211_get_mmie_keyidx(rx->skb) < 0))
1530 * When using MFP, Action frames are not allowed prior to
1531 * having configured keys.
1533 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1534 ieee80211_is_robust_mgmt_frame(
1535 (struct ieee80211_hdr *) rx->skb->data)))
1543 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1545 struct ieee80211_sub_if_data *sdata = rx->sdata;
1546 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1548 if (ieee80211_has_a4(hdr->frame_control) &&
1549 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1552 if (is_multicast_ether_addr(hdr->addr1) &&
1553 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1554 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
1557 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1561 * requires that rx->skb is a frame with ethernet header
1563 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1565 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1566 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1567 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1570 * Allow EAPOL frames to us/the PAE group address regardless
1571 * of whether the frame was encrypted or not.
1573 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1574 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1575 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1578 if (ieee80211_802_1x_port_control(rx) ||
1579 ieee80211_drop_unencrypted(rx, fc))
1586 * requires that rx->skb is a frame with ethernet header
1589 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1591 struct ieee80211_sub_if_data *sdata = rx->sdata;
1592 struct net_device *dev = sdata->dev;
1593 struct sk_buff *skb, *xmit_skb;
1594 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1595 struct sta_info *dsta;
1596 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1601 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1602 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1603 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1604 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1605 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1606 if (is_multicast_ether_addr(ehdr->h_dest)) {
1608 * send multicast frames both to higher layers in
1609 * local net stack and back to the wireless medium
1611 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1612 if (!xmit_skb && net_ratelimit())
1613 printk(KERN_DEBUG "%s: failed to clone "
1614 "multicast frame\n", dev->name);
1616 dsta = sta_info_get(sdata, skb->data);
1619 * The destination station is associated to
1620 * this AP (in this VLAN), so send the frame
1621 * directly to it and do not pass it to local
1631 int align __maybe_unused;
1633 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1635 * 'align' will only take the values 0 or 2 here
1636 * since all frames are required to be aligned
1637 * to 2-byte boundaries when being passed to
1638 * mac80211. That also explains the __skb_push()
1641 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1643 if (WARN_ON(skb_headroom(skb) < 3)) {
1647 u8 *data = skb->data;
1648 size_t len = skb_headlen(skb);
1650 memmove(skb->data, data, len);
1651 skb_set_tail_pointer(skb, len);
1657 /* deliver to local stack */
1658 skb->protocol = eth_type_trans(skb, dev);
1659 memset(skb->cb, 0, sizeof(skb->cb));
1660 netif_receive_skb(skb);
1665 /* send to wireless media */
1666 xmit_skb->protocol = htons(ETH_P_802_3);
1667 skb_reset_network_header(xmit_skb);
1668 skb_reset_mac_header(xmit_skb);
1669 dev_queue_xmit(xmit_skb);
1673 static ieee80211_rx_result debug_noinline
1674 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1676 struct net_device *dev = rx->sdata->dev;
1677 struct sk_buff *skb = rx->skb;
1678 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1679 __le16 fc = hdr->frame_control;
1680 struct sk_buff_head frame_list;
1681 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1683 if (unlikely(!ieee80211_is_data(fc)))
1686 if (unlikely(!ieee80211_is_data_present(fc)))
1687 return RX_DROP_MONITOR;
1689 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1692 if (ieee80211_has_a4(hdr->frame_control) &&
1693 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1694 !rx->sdata->u.vlan.sta)
1695 return RX_DROP_UNUSABLE;
1697 if (is_multicast_ether_addr(hdr->addr1) &&
1698 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1699 rx->sdata->u.vlan.sta) ||
1700 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1701 rx->sdata->u.mgd.use_4addr)))
1702 return RX_DROP_UNUSABLE;
1705 __skb_queue_head_init(&frame_list);
1707 if (skb_linearize(skb))
1708 return RX_DROP_UNUSABLE;
1710 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1711 rx->sdata->vif.type,
1712 rx->local->hw.extra_tx_headroom);
1714 while (!skb_queue_empty(&frame_list)) {
1715 rx->skb = __skb_dequeue(&frame_list);
1717 if (!ieee80211_frame_allowed(rx, fc)) {
1718 dev_kfree_skb(rx->skb);
1721 dev->stats.rx_packets++;
1722 dev->stats.rx_bytes += rx->skb->len;
1724 ieee80211_deliver_skb(rx);
1730 #ifdef CONFIG_MAC80211_MESH
1731 static ieee80211_rx_result
1732 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1734 struct ieee80211_hdr *hdr;
1735 struct ieee80211s_hdr *mesh_hdr;
1736 unsigned int hdrlen;
1737 struct sk_buff *skb = rx->skb, *fwd_skb;
1738 struct ieee80211_local *local = rx->local;
1739 struct ieee80211_sub_if_data *sdata = rx->sdata;
1740 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1742 hdr = (struct ieee80211_hdr *) skb->data;
1743 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1744 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1746 if (!ieee80211_is_data(hdr->frame_control))
1751 return RX_DROP_MONITOR;
1753 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1754 struct mesh_path *mppath;
1758 if (is_multicast_ether_addr(hdr->addr1)) {
1759 mpp_addr = hdr->addr3;
1760 proxied_addr = mesh_hdr->eaddr1;
1762 mpp_addr = hdr->addr4;
1763 proxied_addr = mesh_hdr->eaddr2;
1767 mppath = mpp_path_lookup(proxied_addr, sdata);
1769 mpp_path_add(proxied_addr, mpp_addr, sdata);
1771 spin_lock_bh(&mppath->state_lock);
1772 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1773 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1774 spin_unlock_bh(&mppath->state_lock);
1779 /* Frame has reached destination. Don't forward */
1780 if (!is_multicast_ether_addr(hdr->addr1) &&
1781 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1786 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1788 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1789 dropped_frames_ttl);
1791 struct ieee80211_hdr *fwd_hdr;
1792 struct ieee80211_tx_info *info;
1794 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1796 if (!fwd_skb && net_ratelimit())
1797 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1800 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1801 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1802 info = IEEE80211_SKB_CB(fwd_skb);
1803 memset(info, 0, sizeof(*info));
1804 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1805 info->control.vif = &rx->sdata->vif;
1806 skb_set_queue_mapping(skb,
1807 ieee80211_select_queue(rx->sdata, fwd_skb));
1808 ieee80211_set_qos_hdr(local, skb);
1809 if (is_multicast_ether_addr(fwd_hdr->addr1))
1810 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1815 * Save TA to addr1 to send TA a path error if a
1816 * suitable next hop is not found
1818 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1820 err = mesh_nexthop_lookup(fwd_skb, sdata);
1821 /* Failed to immediately resolve next hop:
1822 * fwded frame was dropped or will be added
1823 * later to the pending skb queue. */
1825 return RX_DROP_MONITOR;
1827 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1830 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1832 ieee80211_add_pending_skb(local, fwd_skb);
1836 if (is_multicast_ether_addr(hdr->addr1) ||
1837 sdata->dev->flags & IFF_PROMISC)
1840 return RX_DROP_MONITOR;
1844 static ieee80211_rx_result debug_noinline
1845 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1847 struct ieee80211_sub_if_data *sdata = rx->sdata;
1848 struct ieee80211_local *local = rx->local;
1849 struct net_device *dev = sdata->dev;
1850 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1851 __le16 fc = hdr->frame_control;
1854 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1857 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1858 return RX_DROP_MONITOR;
1861 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1862 * that a 4-addr station can be detected and moved into a separate VLAN
1864 if (ieee80211_has_a4(hdr->frame_control) &&
1865 sdata->vif.type == NL80211_IFTYPE_AP)
1866 return RX_DROP_MONITOR;
1868 err = __ieee80211_data_to_8023(rx);
1870 return RX_DROP_UNUSABLE;
1872 if (!ieee80211_frame_allowed(rx, fc))
1873 return RX_DROP_MONITOR;
1877 dev->stats.rx_packets++;
1878 dev->stats.rx_bytes += rx->skb->len;
1880 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
1881 !is_multicast_ether_addr(((struct ethhdr *)rx->skb->data)->h_dest)) {
1882 mod_timer(&local->dynamic_ps_timer, jiffies +
1883 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1886 ieee80211_deliver_skb(rx);
1891 static ieee80211_rx_result debug_noinline
1892 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
1894 struct ieee80211_local *local = rx->local;
1895 struct ieee80211_hw *hw = &local->hw;
1896 struct sk_buff *skb = rx->skb;
1897 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1898 struct tid_ampdu_rx *tid_agg_rx;
1902 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1905 if (ieee80211_is_back_req(bar->frame_control)) {
1907 __le16 control, start_seq_num;
1908 } __packed bar_data;
1911 return RX_DROP_MONITOR;
1913 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1914 &bar_data, sizeof(bar_data)))
1915 return RX_DROP_MONITOR;
1917 tid = le16_to_cpu(bar_data.control) >> 12;
1919 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1921 return RX_DROP_MONITOR;
1923 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
1925 /* reset session timer */
1926 if (tid_agg_rx->timeout)
1927 mod_timer(&tid_agg_rx->session_timer,
1928 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1930 spin_lock(&tid_agg_rx->reorder_lock);
1931 /* release stored frames up to start of BAR */
1932 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1934 spin_unlock(&tid_agg_rx->reorder_lock);
1941 * After this point, we only want management frames,
1942 * so we can drop all remaining control frames to
1943 * cooked monitor interfaces.
1945 return RX_DROP_MONITOR;
1948 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1949 struct ieee80211_mgmt *mgmt,
1952 struct ieee80211_local *local = sdata->local;
1953 struct sk_buff *skb;
1954 struct ieee80211_mgmt *resp;
1956 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
1957 /* Not to own unicast address */
1961 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1962 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1963 /* Not from the current AP or not associated yet. */
1967 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1968 /* Too short SA Query request frame */
1972 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1976 skb_reserve(skb, local->hw.extra_tx_headroom);
1977 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1978 memset(resp, 0, 24);
1979 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1980 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
1981 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1982 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1983 IEEE80211_STYPE_ACTION);
1984 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1985 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1986 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1987 memcpy(resp->u.action.u.sa_query.trans_id,
1988 mgmt->u.action.u.sa_query.trans_id,
1989 WLAN_SA_QUERY_TR_ID_LEN);
1991 ieee80211_tx_skb(sdata, skb);
1994 static ieee80211_rx_result debug_noinline
1995 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
1997 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1998 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2001 * From here on, look only at management frames.
2002 * Data and control frames are already handled,
2003 * and unknown (reserved) frames are useless.
2005 if (rx->skb->len < 24)
2006 return RX_DROP_MONITOR;
2008 if (!ieee80211_is_mgmt(mgmt->frame_control))
2009 return RX_DROP_MONITOR;
2011 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2012 return RX_DROP_MONITOR;
2014 if (ieee80211_drop_unencrypted_mgmt(rx))
2015 return RX_DROP_UNUSABLE;
2020 static ieee80211_rx_result debug_noinline
2021 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2023 struct ieee80211_local *local = rx->local;
2024 struct ieee80211_sub_if_data *sdata = rx->sdata;
2025 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2026 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2027 int len = rx->skb->len;
2029 if (!ieee80211_is_action(mgmt->frame_control))
2032 /* drop too small frames */
2033 if (len < IEEE80211_MIN_ACTION_SIZE)
2034 return RX_DROP_UNUSABLE;
2036 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2037 return RX_DROP_UNUSABLE;
2039 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2040 return RX_DROP_UNUSABLE;
2042 switch (mgmt->u.action.category) {
2043 case WLAN_CATEGORY_BACK:
2045 * The aggregation code is not prepared to handle
2046 * anything but STA/AP due to the BSSID handling;
2047 * IBSS could work in the code but isn't supported
2048 * by drivers or the standard.
2050 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2051 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2052 sdata->vif.type != NL80211_IFTYPE_AP)
2055 /* verify action_code is present */
2056 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2059 switch (mgmt->u.action.u.addba_req.action_code) {
2060 case WLAN_ACTION_ADDBA_REQ:
2061 if (len < (IEEE80211_MIN_ACTION_SIZE +
2062 sizeof(mgmt->u.action.u.addba_req)))
2065 case WLAN_ACTION_ADDBA_RESP:
2066 if (len < (IEEE80211_MIN_ACTION_SIZE +
2067 sizeof(mgmt->u.action.u.addba_resp)))
2070 case WLAN_ACTION_DELBA:
2071 if (len < (IEEE80211_MIN_ACTION_SIZE +
2072 sizeof(mgmt->u.action.u.delba)))
2080 case WLAN_CATEGORY_SPECTRUM_MGMT:
2081 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2084 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2087 /* verify action_code is present */
2088 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2091 switch (mgmt->u.action.u.measurement.action_code) {
2092 case WLAN_ACTION_SPCT_MSR_REQ:
2093 if (len < (IEEE80211_MIN_ACTION_SIZE +
2094 sizeof(mgmt->u.action.u.measurement)))
2096 ieee80211_process_measurement_req(sdata, mgmt, len);
2098 case WLAN_ACTION_SPCT_CHL_SWITCH:
2099 if (len < (IEEE80211_MIN_ACTION_SIZE +
2100 sizeof(mgmt->u.action.u.chan_switch)))
2103 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2106 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2112 case WLAN_CATEGORY_SA_QUERY:
2113 if (len < (IEEE80211_MIN_ACTION_SIZE +
2114 sizeof(mgmt->u.action.u.sa_query)))
2117 switch (mgmt->u.action.u.sa_query.action) {
2118 case WLAN_ACTION_SA_QUERY_REQUEST:
2119 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2121 ieee80211_process_sa_query_req(sdata, mgmt, len);
2125 case WLAN_CATEGORY_MESH_PLINK:
2126 case WLAN_CATEGORY_MESH_PATH_SEL:
2127 if (!ieee80211_vif_is_mesh(&sdata->vif))
2135 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2136 /* will return in the next handlers */
2141 rx->sta->rx_packets++;
2142 dev_kfree_skb(rx->skb);
2146 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2147 skb_queue_tail(&sdata->skb_queue, rx->skb);
2148 ieee80211_queue_work(&local->hw, &sdata->work);
2150 rx->sta->rx_packets++;
2154 static ieee80211_rx_result debug_noinline
2155 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2157 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2159 /* skip known-bad action frames and return them in the next handler */
2160 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2164 * Getting here means the kernel doesn't know how to handle
2165 * it, but maybe userspace does ... include returned frames
2166 * so userspace can register for those to know whether ones
2167 * it transmitted were processed or returned.
2170 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2171 rx->skb->data, rx->skb->len,
2174 rx->sta->rx_packets++;
2175 dev_kfree_skb(rx->skb);
2183 static ieee80211_rx_result debug_noinline
2184 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2186 struct ieee80211_local *local = rx->local;
2187 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2188 struct sk_buff *nskb;
2189 struct ieee80211_sub_if_data *sdata = rx->sdata;
2190 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2192 if (!ieee80211_is_action(mgmt->frame_control))
2196 * For AP mode, hostapd is responsible for handling any action
2197 * frames that we didn't handle, including returning unknown
2198 * ones. For all other modes we will return them to the sender,
2199 * setting the 0x80 bit in the action category, as required by
2200 * 802.11-2007 7.3.1.11.
2201 * Newer versions of hostapd shall also use the management frame
2202 * registration mechanisms, but older ones still use cooked
2203 * monitor interfaces so push all frames there.
2205 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2206 (sdata->vif.type == NL80211_IFTYPE_AP ||
2207 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2208 return RX_DROP_MONITOR;
2210 /* do not return rejected action frames */
2211 if (mgmt->u.action.category & 0x80)
2212 return RX_DROP_UNUSABLE;
2214 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2217 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2219 nmgmt->u.action.category |= 0x80;
2220 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2221 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2223 memset(nskb->cb, 0, sizeof(nskb->cb));
2225 ieee80211_tx_skb(rx->sdata, nskb);
2227 dev_kfree_skb(rx->skb);
2231 static ieee80211_rx_result debug_noinline
2232 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2234 struct ieee80211_sub_if_data *sdata = rx->sdata;
2235 ieee80211_rx_result rxs;
2236 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2239 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2240 if (rxs != RX_CONTINUE)
2243 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2245 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2246 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2247 sdata->vif.type != NL80211_IFTYPE_STATION)
2248 return RX_DROP_MONITOR;
2251 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2252 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2253 /* process for all: mesh, mlme, ibss */
2255 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2256 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2257 if (is_multicast_ether_addr(mgmt->da) &&
2258 !is_broadcast_ether_addr(mgmt->da))
2259 return RX_DROP_MONITOR;
2261 /* process only for station */
2262 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2263 return RX_DROP_MONITOR;
2265 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2266 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2267 /* process only for ibss */
2268 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2269 return RX_DROP_MONITOR;
2272 return RX_DROP_MONITOR;
2275 /* queue up frame and kick off work to process it */
2276 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2277 skb_queue_tail(&sdata->skb_queue, rx->skb);
2278 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2280 rx->sta->rx_packets++;
2285 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
2286 struct ieee80211_rx_data *rx)
2289 unsigned int hdrlen;
2291 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2292 if (rx->skb->len >= hdrlen + 4)
2293 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2299 * Some hardware seem to generate incorrect Michael MIC
2300 * reports; ignore them to avoid triggering countermeasures.
2305 if (!ieee80211_has_protected(hdr->frame_control))
2308 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
2310 * APs with pairwise keys should never receive Michael MIC
2311 * errors for non-zero keyidx because these are reserved for
2312 * group keys and only the AP is sending real multicast
2313 * frames in the BSS.
2318 if (!ieee80211_is_data(hdr->frame_control) &&
2319 !ieee80211_is_auth(hdr->frame_control))
2322 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2326 /* TODO: use IEEE80211_RX_FRAGMENTED */
2327 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2328 struct ieee80211_rate *rate)
2330 struct ieee80211_sub_if_data *sdata;
2331 struct ieee80211_local *local = rx->local;
2332 struct ieee80211_rtap_hdr {
2333 struct ieee80211_radiotap_header hdr;
2339 struct sk_buff *skb = rx->skb, *skb2;
2340 struct net_device *prev_dev = NULL;
2341 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2344 * If cooked monitor has been processed already, then
2345 * don't do it again. If not, set the flag.
2347 if (rx->flags & IEEE80211_RX_CMNTR)
2349 rx->flags |= IEEE80211_RX_CMNTR;
2351 if (skb_headroom(skb) < sizeof(*rthdr) &&
2352 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2355 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2356 memset(rthdr, 0, sizeof(*rthdr));
2357 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2358 rthdr->hdr.it_present =
2359 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2360 (1 << IEEE80211_RADIOTAP_CHANNEL));
2363 rthdr->rate_or_pad = rate->bitrate / 5;
2364 rthdr->hdr.it_present |=
2365 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2367 rthdr->chan_freq = cpu_to_le16(status->freq);
2369 if (status->band == IEEE80211_BAND_5GHZ)
2370 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2371 IEEE80211_CHAN_5GHZ);
2373 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2374 IEEE80211_CHAN_2GHZ);
2376 skb_set_mac_header(skb, 0);
2377 skb->ip_summed = CHECKSUM_UNNECESSARY;
2378 skb->pkt_type = PACKET_OTHERHOST;
2379 skb->protocol = htons(ETH_P_802_2);
2381 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2382 if (!ieee80211_sdata_running(sdata))
2385 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2386 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2390 skb2 = skb_clone(skb, GFP_ATOMIC);
2392 skb2->dev = prev_dev;
2393 netif_receive_skb(skb2);
2397 prev_dev = sdata->dev;
2398 sdata->dev->stats.rx_packets++;
2399 sdata->dev->stats.rx_bytes += skb->len;
2403 skb->dev = prev_dev;
2404 netif_receive_skb(skb);
2412 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2413 ieee80211_rx_result res)
2416 case RX_DROP_MONITOR:
2417 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2419 rx->sta->rx_dropped++;
2422 struct ieee80211_rate *rate = NULL;
2423 struct ieee80211_supported_band *sband;
2424 struct ieee80211_rx_status *status;
2426 status = IEEE80211_SKB_RXCB((rx->skb));
2428 sband = rx->local->hw.wiphy->bands[status->band];
2429 if (!(status->flag & RX_FLAG_HT))
2430 rate = &sband->bitrates[status->rate_idx];
2432 ieee80211_rx_cooked_monitor(rx, rate);
2435 case RX_DROP_UNUSABLE:
2436 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2438 rx->sta->rx_dropped++;
2439 dev_kfree_skb(rx->skb);
2442 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2447 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2448 struct sk_buff_head *frames)
2450 ieee80211_rx_result res = RX_DROP_MONITOR;
2451 struct sk_buff *skb;
2453 #define CALL_RXH(rxh) \
2456 if (res != RX_CONTINUE) \
2460 while ((skb = __skb_dequeue(frames))) {
2462 * all the other fields are valid across frames
2463 * that belong to an aMPDU since they are on the
2464 * same TID from the same station
2469 CALL_RXH(ieee80211_rx_h_decrypt)
2470 CALL_RXH(ieee80211_rx_h_check_more_data)
2471 CALL_RXH(ieee80211_rx_h_sta_process)
2472 CALL_RXH(ieee80211_rx_h_defragment)
2473 CALL_RXH(ieee80211_rx_h_ps_poll)
2474 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2475 /* must be after MMIC verify so header is counted in MPDU mic */
2476 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2477 CALL_RXH(ieee80211_rx_h_amsdu)
2478 #ifdef CONFIG_MAC80211_MESH
2479 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2480 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2482 CALL_RXH(ieee80211_rx_h_data)
2484 /* special treatment -- needs the queue */
2485 res = ieee80211_rx_h_ctrl(rx, frames);
2486 if (res != RX_CONTINUE)
2489 CALL_RXH(ieee80211_rx_h_mgmt_check)
2490 CALL_RXH(ieee80211_rx_h_action)
2491 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2492 CALL_RXH(ieee80211_rx_h_action_return)
2493 CALL_RXH(ieee80211_rx_h_mgmt)
2496 ieee80211_rx_handlers_result(rx, res);
2502 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2504 struct sk_buff_head reorder_release;
2505 ieee80211_rx_result res = RX_DROP_MONITOR;
2507 __skb_queue_head_init(&reorder_release);
2509 #define CALL_RXH(rxh) \
2512 if (res != RX_CONTINUE) \
2516 CALL_RXH(ieee80211_rx_h_passive_scan)
2517 CALL_RXH(ieee80211_rx_h_check)
2519 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2521 ieee80211_rx_handlers(rx, &reorder_release);
2525 ieee80211_rx_handlers_result(rx, res);
2531 * This function makes calls into the RX path, therefore
2532 * it has to be invoked under RCU read lock.
2534 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2536 struct sk_buff_head frames;
2537 struct ieee80211_rx_data rx = {
2539 .sdata = sta->sdata,
2540 .local = sta->local,
2543 struct tid_ampdu_rx *tid_agg_rx;
2545 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2549 __skb_queue_head_init(&frames);
2551 spin_lock(&tid_agg_rx->reorder_lock);
2552 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
2553 spin_unlock(&tid_agg_rx->reorder_lock);
2555 ieee80211_rx_handlers(&rx, &frames);
2558 /* main receive path */
2560 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2561 struct ieee80211_hdr *hdr)
2563 struct ieee80211_sub_if_data *sdata = rx->sdata;
2564 struct sk_buff *skb = rx->skb;
2565 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2566 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2567 int multicast = is_multicast_ether_addr(hdr->addr1);
2569 switch (sdata->vif.type) {
2570 case NL80211_IFTYPE_STATION:
2571 if (!bssid && !sdata->u.mgd.use_4addr)
2574 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2575 if (!(sdata->dev->flags & IFF_PROMISC))
2577 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2580 case NL80211_IFTYPE_ADHOC:
2583 if (ieee80211_is_beacon(hdr->frame_control)) {
2586 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2587 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2589 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2590 } else if (!multicast &&
2591 compare_ether_addr(sdata->vif.addr,
2593 if (!(sdata->dev->flags & IFF_PROMISC))
2595 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2596 } else if (!rx->sta) {
2598 if (status->flag & RX_FLAG_HT)
2599 rate_idx = 0; /* TODO: HT rates */
2601 rate_idx = status->rate_idx;
2602 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2603 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2606 case NL80211_IFTYPE_MESH_POINT:
2608 compare_ether_addr(sdata->vif.addr,
2610 if (!(sdata->dev->flags & IFF_PROMISC))
2613 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2616 case NL80211_IFTYPE_AP_VLAN:
2617 case NL80211_IFTYPE_AP:
2619 if (compare_ether_addr(sdata->vif.addr,
2622 } else if (!ieee80211_bssid_match(bssid,
2624 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2626 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2629 case NL80211_IFTYPE_WDS:
2630 if (bssid || !ieee80211_is_data(hdr->frame_control))
2632 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2636 /* should never get here */
2645 * This function returns whether or not the SKB
2646 * was destined for RX processing or not, which,
2647 * if consume is true, is equivalent to whether
2648 * or not the skb was consumed.
2650 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2651 struct sk_buff *skb, bool consume)
2653 struct ieee80211_local *local = rx->local;
2654 struct ieee80211_sub_if_data *sdata = rx->sdata;
2655 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2656 struct ieee80211_hdr *hdr = (void *)skb->data;
2660 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2661 prepares = prepare_for_handlers(rx, hdr);
2666 if (status->flag & RX_FLAG_MMIC_ERROR) {
2667 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
2668 ieee80211_rx_michael_mic_report(hdr, rx);
2673 skb = skb_copy(skb, GFP_ATOMIC);
2675 if (net_ratelimit())
2676 wiphy_debug(local->hw.wiphy,
2677 "failed to copy multicast frame for %s\n",
2685 ieee80211_invoke_rx_handlers(rx);
2690 * This is the actual Rx frames handler. as it blongs to Rx path it must
2691 * be called with rcu_read_lock protection.
2693 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2694 struct sk_buff *skb)
2696 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2697 struct ieee80211_local *local = hw_to_local(hw);
2698 struct ieee80211_sub_if_data *sdata;
2699 struct ieee80211_hdr *hdr;
2701 struct ieee80211_rx_data rx;
2702 struct ieee80211_sub_if_data *prev;
2703 struct sta_info *sta, *tmp, *prev_sta;
2706 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2707 memset(&rx, 0, sizeof(rx));
2711 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2712 local->dot11ReceivedFragmentCount++;
2714 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2715 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2716 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2718 if (ieee80211_is_mgmt(fc))
2719 err = skb_linearize(skb);
2721 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2728 hdr = (struct ieee80211_hdr *)skb->data;
2729 ieee80211_parse_qos(&rx);
2730 ieee80211_verify_alignment(&rx);
2732 if (ieee80211_is_data(fc)) {
2735 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2742 rx.sdata = prev_sta->sdata;
2743 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2750 rx.sdata = prev_sta->sdata;
2752 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2760 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2761 if (!ieee80211_sdata_running(sdata))
2764 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2765 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2769 * frame is destined for this interface, but if it's
2770 * not also for the previous one we handle that after
2771 * the loop to avoid copying the SKB once too much
2779 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2781 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2787 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2790 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2799 * This is the receive path handler. It is called by a low level driver when an
2800 * 802.11 MPDU is received from the hardware.
2802 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2804 struct ieee80211_local *local = hw_to_local(hw);
2805 struct ieee80211_rate *rate = NULL;
2806 struct ieee80211_supported_band *sband;
2807 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2809 WARN_ON_ONCE(softirq_count() == 0);
2811 if (WARN_ON(status->band < 0 ||
2812 status->band >= IEEE80211_NUM_BANDS))
2815 sband = local->hw.wiphy->bands[status->band];
2816 if (WARN_ON(!sband))
2820 * If we're suspending, it is possible although not too likely
2821 * that we'd be receiving frames after having already partially
2822 * quiesced the stack. We can't process such frames then since
2823 * that might, for example, cause stations to be added or other
2824 * driver callbacks be invoked.
2826 if (unlikely(local->quiescing || local->suspended))
2830 * The same happens when we're not even started,
2831 * but that's worth a warning.
2833 if (WARN_ON(!local->started))
2836 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
2838 * Validate the rate, unless a PLCP error means that
2839 * we probably can't have a valid rate here anyway.
2842 if (status->flag & RX_FLAG_HT) {
2844 * rate_idx is MCS index, which can be [0-76]
2847 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2849 * Anything else would be some sort of driver or
2850 * hardware error. The driver should catch hardware
2853 if (WARN((status->rate_idx < 0 ||
2854 status->rate_idx > 76),
2855 "Rate marked as an HT rate but passed "
2856 "status->rate_idx is not "
2857 "an MCS index [0-76]: %d (0x%02x)\n",
2862 if (WARN_ON(status->rate_idx < 0 ||
2863 status->rate_idx >= sband->n_bitrates))
2865 rate = &sband->bitrates[status->rate_idx];
2869 status->rx_flags = 0;
2872 * key references and virtual interfaces are protected using RCU
2873 * and this requires that we are in a read-side RCU section during
2874 * receive processing
2879 * Frames with failed FCS/PLCP checksum are not returned,
2880 * all other frames are returned without radiotap header
2881 * if it was previously present.
2882 * Also, frames with less than 16 bytes are dropped.
2884 skb = ieee80211_rx_monitor(local, skb, rate);
2890 __ieee80211_rx_handle_packet(hw, skb);
2898 EXPORT_SYMBOL(ieee80211_rx);
2900 /* This is a version of the rx handler that can be called from hard irq
2901 * context. Post the skb on the queue and schedule the tasklet */
2902 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2904 struct ieee80211_local *local = hw_to_local(hw);
2906 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2908 skb->pkt_type = IEEE80211_RX_MSG;
2909 skb_queue_tail(&local->skb_queue, skb);
2910 tasklet_schedule(&local->tasklet);
2912 EXPORT_SYMBOL(ieee80211_rx_irqsafe);