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];
544 /* release the frame from the reorder ring buffer */
545 tid_agg_rx->stored_mpdu_num--;
546 tid_agg_rx->reorder_buf[index] = NULL;
547 __skb_queue_tail(frames, skb);
550 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
553 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
554 struct tid_ampdu_rx *tid_agg_rx,
556 struct sk_buff_head *frames)
560 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
561 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
562 tid_agg_rx->buf_size;
563 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
568 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
569 * the skb was added to the buffer longer than this time ago, the earlier
570 * frames that have not yet been received are assumed to be lost and the skb
571 * can be released for processing. This may also release other skb's from the
572 * reorder buffer if there are no additional gaps between the frames.
574 * Callers must hold tid_agg_rx->reorder_lock.
576 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
578 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
579 struct tid_ampdu_rx *tid_agg_rx,
580 struct sk_buff_head *frames)
584 /* release the buffer until next missing frame */
585 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
586 tid_agg_rx->buf_size;
587 if (!tid_agg_rx->reorder_buf[index] &&
588 tid_agg_rx->stored_mpdu_num > 1) {
590 * No buffers ready to be released, but check whether any
591 * frames in the reorder buffer have timed out.
594 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
595 j = (j + 1) % tid_agg_rx->buf_size) {
596 if (!tid_agg_rx->reorder_buf[j]) {
600 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
601 HT_RX_REORDER_BUF_TIMEOUT))
602 goto set_release_timer;
604 #ifdef CONFIG_MAC80211_HT_DEBUG
606 wiphy_debug(hw->wiphy,
607 "release an RX reorder frame due to timeout on earlier frames\n");
609 ieee80211_release_reorder_frame(hw, tid_agg_rx,
613 * Increment the head seq# also for the skipped slots.
615 tid_agg_rx->head_seq_num =
616 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
619 } else while (tid_agg_rx->reorder_buf[index]) {
620 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
621 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
622 tid_agg_rx->buf_size;
626 * Disable the reorder release timer for now.
628 * The current implementation lacks a proper locking scheme
629 * which would protect vital statistic and debug counters
630 * from being updated by two different but concurrent BHs.
632 * More information about the topic is available from:
633 * - thread: http://marc.info/?t=128635927000001
636 * => http://marc.info/?l=linux-wireless&m=128636170811964
637 * "Basically the thing is that until your patch, the data
638 * in the struct didn't actually need locking because it
639 * was accessed by the RX path only which is not concurrent."
641 * List of what needs to be fixed:
642 * => http://marc.info/?l=linux-wireless&m=128656352920957
645 if (tid_agg_rx->stored_mpdu_num) {
646 j = index = seq_sub(tid_agg_rx->head_seq_num,
647 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
649 for (; j != (index - 1) % tid_agg_rx->buf_size;
650 j = (j + 1) % tid_agg_rx->buf_size) {
651 if (tid_agg_rx->reorder_buf[j])
657 mod_timer(&tid_agg_rx->reorder_timer,
658 tid_agg_rx->reorder_time[j] +
659 HT_RX_REORDER_BUF_TIMEOUT);
661 del_timer(&tid_agg_rx->reorder_timer);
670 * As this function belongs to the RX path it must be under
671 * rcu_read_lock protection. It returns false if the frame
672 * can be processed immediately, true if it was consumed.
674 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
675 struct tid_ampdu_rx *tid_agg_rx,
677 struct sk_buff_head *frames)
679 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
680 u16 sc = le16_to_cpu(hdr->seq_ctrl);
681 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
682 u16 head_seq_num, buf_size;
686 buf_size = tid_agg_rx->buf_size;
687 head_seq_num = tid_agg_rx->head_seq_num;
689 spin_lock(&tid_agg_rx->reorder_lock);
690 /* frame with out of date sequence number */
691 if (seq_less(mpdu_seq_num, head_seq_num)) {
697 * If frame the sequence number exceeds our buffering window
698 * size release some previous frames to make room for this one.
700 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
701 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
702 /* release stored frames up to new head to stack */
703 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
707 /* Now the new frame is always in the range of the reordering buffer */
709 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
711 /* check if we already stored this frame */
712 if (tid_agg_rx->reorder_buf[index]) {
718 * If the current MPDU is in the right order and nothing else
719 * is stored we can process it directly, no need to buffer it.
721 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
722 tid_agg_rx->stored_mpdu_num == 0) {
723 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
728 /* put the frame in the reordering buffer */
729 tid_agg_rx->reorder_buf[index] = skb;
730 tid_agg_rx->reorder_time[index] = jiffies;
731 tid_agg_rx->stored_mpdu_num++;
732 ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
735 spin_unlock(&tid_agg_rx->reorder_lock);
740 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
741 * true if the MPDU was buffered, false if it should be processed.
743 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
744 struct sk_buff_head *frames)
746 struct sk_buff *skb = rx->skb;
747 struct ieee80211_local *local = rx->local;
748 struct ieee80211_hw *hw = &local->hw;
749 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
750 struct sta_info *sta = rx->sta;
751 struct tid_ampdu_rx *tid_agg_rx;
755 if (!ieee80211_is_data_qos(hdr->frame_control))
759 * filter the QoS data rx stream according to
760 * STA/TID and check if this STA/TID is on aggregation
766 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
768 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
772 /* qos null data frames are excluded */
773 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
776 /* new, potentially un-ordered, ampdu frame - process it */
778 /* reset session timer */
779 if (tid_agg_rx->timeout)
780 mod_timer(&tid_agg_rx->session_timer,
781 TU_TO_EXP_TIME(tid_agg_rx->timeout));
783 /* if this mpdu is fragmented - terminate rx aggregation session */
784 sc = le16_to_cpu(hdr->seq_ctrl);
785 if (sc & IEEE80211_SCTL_FRAG) {
786 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
787 skb_queue_tail(&rx->sdata->skb_queue, skb);
788 ieee80211_queue_work(&local->hw, &rx->sdata->work);
793 * No locking needed -- we will only ever process one
794 * RX packet at a time, and thus own tid_agg_rx. All
795 * other code manipulating it needs to (and does) make
796 * sure that we cannot get to it any more before doing
799 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
803 __skb_queue_tail(frames, skb);
806 static ieee80211_rx_result debug_noinline
807 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
809 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
810 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
812 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
813 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
814 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
815 rx->sta->last_seq_ctrl[rx->queue] ==
817 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
818 rx->local->dot11FrameDuplicateCount++;
819 rx->sta->num_duplicates++;
821 return RX_DROP_MONITOR;
823 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
826 if (unlikely(rx->skb->len < 16)) {
827 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
828 return RX_DROP_MONITOR;
831 /* Drop disallowed frame classes based on STA auth/assoc state;
832 * IEEE 802.11, Chap 5.5.
834 * mac80211 filters only based on association state, i.e. it drops
835 * Class 3 frames from not associated stations. hostapd sends
836 * deauth/disassoc frames when needed. In addition, hostapd is
837 * responsible for filtering on both auth and assoc states.
840 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
841 return ieee80211_rx_mesh_check(rx);
843 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
844 ieee80211_is_pspoll(hdr->frame_control)) &&
845 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
846 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
847 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
848 if ((!ieee80211_has_fromds(hdr->frame_control) &&
849 !ieee80211_has_tods(hdr->frame_control) &&
850 ieee80211_is_data(hdr->frame_control)) ||
851 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
852 /* Drop IBSS frames and frames for other hosts
854 return RX_DROP_MONITOR;
857 return RX_DROP_MONITOR;
864 static ieee80211_rx_result debug_noinline
865 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
867 struct sk_buff *skb = rx->skb;
868 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
869 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
872 ieee80211_rx_result result = RX_DROP_UNUSABLE;
873 struct ieee80211_key *sta_ptk = NULL;
874 int mmie_keyidx = -1;
880 * There are four types of keys:
882 * - IGTK (group keys for management frames)
883 * - PTK (pairwise keys)
884 * - STK (station-to-station pairwise keys)
886 * When selecting a key, we have to distinguish between multicast
887 * (including broadcast) and unicast frames, the latter can only
888 * use PTKs and STKs while the former always use GTKs and IGTKs.
889 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
890 * unicast frames can also use key indices like GTKs. Hence, if we
891 * don't have a PTK/STK we check the key index for a WEP key.
893 * Note that in a regular BSS, multicast frames are sent by the
894 * AP only, associated stations unicast the frame to the AP first
895 * which then multicasts it on their behalf.
897 * There is also a slight problem in IBSS mode: GTKs are negotiated
898 * with each station, that is something we don't currently handle.
899 * The spec seems to expect that one negotiates the same key with
900 * every station but there's no such requirement; VLANs could be
905 * No point in finding a key and decrypting if the frame is neither
906 * addressed to us nor a multicast frame.
908 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
911 /* start without a key */
915 sta_ptk = rcu_dereference(rx->sta->ptk);
917 fc = hdr->frame_control;
919 if (!ieee80211_has_protected(fc))
920 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
922 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
924 if ((status->flag & RX_FLAG_DECRYPTED) &&
925 (status->flag & RX_FLAG_IV_STRIPPED))
927 /* Skip decryption if the frame is not protected. */
928 if (!ieee80211_has_protected(fc))
930 } else if (mmie_keyidx >= 0) {
931 /* Broadcast/multicast robust management frame / BIP */
932 if ((status->flag & RX_FLAG_DECRYPTED) &&
933 (status->flag & RX_FLAG_IV_STRIPPED))
936 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
937 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
938 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
940 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
942 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
943 } else if (!ieee80211_has_protected(fc)) {
945 * The frame was not protected, so skip decryption. However, we
946 * need to set rx->key if there is a key that could have been
947 * used so that the frame may be dropped if encryption would
948 * have been expected.
950 struct ieee80211_key *key = NULL;
951 if (ieee80211_is_mgmt(fc) &&
952 is_multicast_ether_addr(hdr->addr1) &&
953 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
955 else if ((key = rcu_dereference(rx->sdata->default_key)))
961 * The device doesn't give us the IV so we won't be
962 * able to look up the key. That's ok though, we
963 * don't need to decrypt the frame, we just won't
964 * be able to keep statistics accurate.
965 * Except for key threshold notifications, should
966 * we somehow allow the driver to tell us which key
967 * the hardware used if this flag is set?
969 if ((status->flag & RX_FLAG_DECRYPTED) &&
970 (status->flag & RX_FLAG_IV_STRIPPED))
973 hdrlen = ieee80211_hdrlen(fc);
975 if (rx->skb->len < 8 + hdrlen)
976 return RX_DROP_UNUSABLE; /* TODO: count this? */
979 * no need to call ieee80211_wep_get_keyidx,
980 * it verifies a bunch of things we've done already
982 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
985 /* check per-station GTK first, if multicast packet */
986 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
987 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
989 /* if not found, try default key */
991 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
994 * RSNA-protected unicast frames should always be
995 * sent with pairwise or station-to-station keys,
996 * but for WEP we allow using a key index as well.
999 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1000 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1001 !is_multicast_ether_addr(hdr->addr1))
1007 rx->key->tx_rx_count++;
1008 /* TODO: add threshold stuff again */
1010 return RX_DROP_MONITOR;
1013 if (skb_linearize(rx->skb))
1014 return RX_DROP_UNUSABLE;
1015 /* the hdr variable is invalid now! */
1017 switch (rx->key->conf.cipher) {
1018 case WLAN_CIPHER_SUITE_WEP40:
1019 case WLAN_CIPHER_SUITE_WEP104:
1020 /* Check for weak IVs if possible */
1021 if (rx->sta && ieee80211_is_data(fc) &&
1022 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1023 !(status->flag & RX_FLAG_DECRYPTED)) &&
1024 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1025 rx->sta->wep_weak_iv_count++;
1027 result = ieee80211_crypto_wep_decrypt(rx);
1029 case WLAN_CIPHER_SUITE_TKIP:
1030 result = ieee80211_crypto_tkip_decrypt(rx);
1032 case WLAN_CIPHER_SUITE_CCMP:
1033 result = ieee80211_crypto_ccmp_decrypt(rx);
1035 case WLAN_CIPHER_SUITE_AES_CMAC:
1036 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1040 * We can reach here only with HW-only algorithms
1041 * but why didn't it decrypt the frame?!
1043 return RX_DROP_UNUSABLE;
1046 /* either the frame has been decrypted or will be dropped */
1047 status->flag |= RX_FLAG_DECRYPTED;
1052 static ieee80211_rx_result debug_noinline
1053 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1055 struct ieee80211_local *local;
1056 struct ieee80211_hdr *hdr;
1057 struct sk_buff *skb;
1061 hdr = (struct ieee80211_hdr *) skb->data;
1063 if (!local->pspolling)
1066 if (!ieee80211_has_fromds(hdr->frame_control))
1067 /* this is not from AP */
1070 if (!ieee80211_is_data(hdr->frame_control))
1073 if (!ieee80211_has_moredata(hdr->frame_control)) {
1074 /* AP has no more frames buffered for us */
1075 local->pspolling = false;
1079 /* more data bit is set, let's request a new frame from the AP */
1080 ieee80211_send_pspoll(local, rx->sdata);
1085 static void ap_sta_ps_start(struct sta_info *sta)
1087 struct ieee80211_sub_if_data *sdata = sta->sdata;
1088 struct ieee80211_local *local = sdata->local;
1090 atomic_inc(&sdata->bss->num_sta_ps);
1091 set_sta_flags(sta, WLAN_STA_PS_STA);
1092 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1093 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1094 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1095 sdata->name, sta->sta.addr, sta->sta.aid);
1096 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1099 static void ap_sta_ps_end(struct sta_info *sta)
1101 struct ieee80211_sub_if_data *sdata = sta->sdata;
1103 atomic_dec(&sdata->bss->num_sta_ps);
1105 clear_sta_flags(sta, WLAN_STA_PS_STA);
1107 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1108 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1109 sdata->name, sta->sta.addr, sta->sta.aid);
1110 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1112 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
1113 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1114 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1115 sdata->name, sta->sta.addr, sta->sta.aid);
1116 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1120 ieee80211_sta_ps_deliver_wakeup(sta);
1123 static ieee80211_rx_result debug_noinline
1124 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1126 struct sta_info *sta = rx->sta;
1127 struct sk_buff *skb = rx->skb;
1128 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1129 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1135 * Update last_rx only for IBSS packets which are for the current
1136 * BSSID to avoid keeping the current IBSS network alive in cases
1137 * where other STAs start using different BSSID.
1139 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1140 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1141 NL80211_IFTYPE_ADHOC);
1142 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
1143 sta->last_rx = jiffies;
1144 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1146 * Mesh beacons will update last_rx when if they are found to
1147 * match the current local configuration when processed.
1149 sta->last_rx = jiffies;
1152 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1155 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1156 ieee80211_sta_rx_notify(rx->sdata, hdr);
1158 sta->rx_fragments++;
1159 sta->rx_bytes += rx->skb->len;
1160 sta->last_signal = status->signal;
1163 * Change STA power saving mode only at the end of a frame
1164 * exchange sequence.
1166 if (!ieee80211_has_morefrags(hdr->frame_control) &&
1167 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1168 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1169 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
1171 * Ignore doze->wake transitions that are
1172 * indicated by non-data frames, the standard
1173 * is unclear here, but for example going to
1174 * PS mode and then scanning would cause a
1175 * doze->wake transition for the probe request,
1176 * and that is clearly undesirable.
1178 if (ieee80211_is_data(hdr->frame_control) &&
1179 !ieee80211_has_pm(hdr->frame_control))
1182 if (ieee80211_has_pm(hdr->frame_control))
1183 ap_sta_ps_start(sta);
1188 * Drop (qos-)data::nullfunc frames silently, since they
1189 * are used only to control station power saving mode.
1191 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1192 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1193 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1196 * If we receive a 4-addr nullfunc frame from a STA
1197 * that was not moved to a 4-addr STA vlan yet, drop
1198 * the frame to the monitor interface, to make sure
1199 * that hostapd sees it
1201 if (ieee80211_has_a4(hdr->frame_control) &&
1202 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1203 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1204 !rx->sdata->u.vlan.sta)))
1205 return RX_DROP_MONITOR;
1207 * Update counter and free packet here to avoid
1208 * counting this as a dropped packed.
1211 dev_kfree_skb(rx->skb);
1216 } /* ieee80211_rx_h_sta_process */
1218 static inline struct ieee80211_fragment_entry *
1219 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1220 unsigned int frag, unsigned int seq, int rx_queue,
1221 struct sk_buff **skb)
1223 struct ieee80211_fragment_entry *entry;
1226 idx = sdata->fragment_next;
1227 entry = &sdata->fragments[sdata->fragment_next++];
1228 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1229 sdata->fragment_next = 0;
1231 if (!skb_queue_empty(&entry->skb_list)) {
1232 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1233 struct ieee80211_hdr *hdr =
1234 (struct ieee80211_hdr *) entry->skb_list.next->data;
1235 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1236 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1237 "addr1=%pM addr2=%pM\n",
1239 jiffies - entry->first_frag_time, entry->seq,
1240 entry->last_frag, hdr->addr1, hdr->addr2);
1242 __skb_queue_purge(&entry->skb_list);
1245 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1247 entry->first_frag_time = jiffies;
1249 entry->rx_queue = rx_queue;
1250 entry->last_frag = frag;
1252 entry->extra_len = 0;
1257 static inline struct ieee80211_fragment_entry *
1258 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1259 unsigned int frag, unsigned int seq,
1260 int rx_queue, struct ieee80211_hdr *hdr)
1262 struct ieee80211_fragment_entry *entry;
1265 idx = sdata->fragment_next;
1266 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1267 struct ieee80211_hdr *f_hdr;
1271 idx = IEEE80211_FRAGMENT_MAX - 1;
1273 entry = &sdata->fragments[idx];
1274 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1275 entry->rx_queue != rx_queue ||
1276 entry->last_frag + 1 != frag)
1279 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1282 * Check ftype and addresses are equal, else check next fragment
1284 if (((hdr->frame_control ^ f_hdr->frame_control) &
1285 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1286 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1287 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1290 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1291 __skb_queue_purge(&entry->skb_list);
1300 static ieee80211_rx_result debug_noinline
1301 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1303 struct ieee80211_hdr *hdr;
1306 unsigned int frag, seq;
1307 struct ieee80211_fragment_entry *entry;
1308 struct sk_buff *skb;
1309 struct ieee80211_rx_status *status;
1311 hdr = (struct ieee80211_hdr *)rx->skb->data;
1312 fc = hdr->frame_control;
1313 sc = le16_to_cpu(hdr->seq_ctrl);
1314 frag = sc & IEEE80211_SCTL_FRAG;
1316 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1317 (rx->skb)->len < 24 ||
1318 is_multicast_ether_addr(hdr->addr1))) {
1319 /* not fragmented */
1322 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1324 if (skb_linearize(rx->skb))
1325 return RX_DROP_UNUSABLE;
1328 * skb_linearize() might change the skb->data and
1329 * previously cached variables (in this case, hdr) need to
1330 * be refreshed with the new data.
1332 hdr = (struct ieee80211_hdr *)rx->skb->data;
1333 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1336 /* This is the first fragment of a new frame. */
1337 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1338 rx->queue, &(rx->skb));
1339 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1340 ieee80211_has_protected(fc)) {
1341 int queue = ieee80211_is_mgmt(fc) ?
1342 NUM_RX_DATA_QUEUES : rx->queue;
1343 /* Store CCMP PN so that we can verify that the next
1344 * fragment has a sequential PN value. */
1346 memcpy(entry->last_pn,
1347 rx->key->u.ccmp.rx_pn[queue],
1353 /* This is a fragment for a frame that should already be pending in
1354 * fragment cache. Add this fragment to the end of the pending entry.
1356 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1358 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1359 return RX_DROP_MONITOR;
1362 /* Verify that MPDUs within one MSDU have sequential PN values.
1363 * (IEEE 802.11i, 8.3.3.4.5) */
1366 u8 pn[CCMP_PN_LEN], *rpn;
1368 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1369 return RX_DROP_UNUSABLE;
1370 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1371 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1376 queue = ieee80211_is_mgmt(fc) ?
1377 NUM_RX_DATA_QUEUES : rx->queue;
1378 rpn = rx->key->u.ccmp.rx_pn[queue];
1379 if (memcmp(pn, rpn, CCMP_PN_LEN))
1380 return RX_DROP_UNUSABLE;
1381 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1384 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1385 __skb_queue_tail(&entry->skb_list, rx->skb);
1386 entry->last_frag = frag;
1387 entry->extra_len += rx->skb->len;
1388 if (ieee80211_has_morefrags(fc)) {
1393 rx->skb = __skb_dequeue(&entry->skb_list);
1394 if (skb_tailroom(rx->skb) < entry->extra_len) {
1395 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1396 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1398 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1399 __skb_queue_purge(&entry->skb_list);
1400 return RX_DROP_UNUSABLE;
1403 while ((skb = __skb_dequeue(&entry->skb_list))) {
1404 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1408 /* Complete frame has been reassembled - process it now */
1409 status = IEEE80211_SKB_RXCB(rx->skb);
1410 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1414 rx->sta->rx_packets++;
1415 if (is_multicast_ether_addr(hdr->addr1))
1416 rx->local->dot11MulticastReceivedFrameCount++;
1418 ieee80211_led_rx(rx->local);
1422 static ieee80211_rx_result debug_noinline
1423 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1425 struct ieee80211_sub_if_data *sdata = rx->sdata;
1426 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1427 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1429 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1430 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
1433 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1434 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1435 return RX_DROP_UNUSABLE;
1437 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1438 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1440 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1442 /* Free PS Poll skb here instead of returning RX_DROP that would
1443 * count as an dropped frame. */
1444 dev_kfree_skb(rx->skb);
1449 static ieee80211_rx_result debug_noinline
1450 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1452 u8 *data = rx->skb->data;
1453 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1455 if (!ieee80211_is_data_qos(hdr->frame_control))
1458 /* remove the qos control field, update frame type and meta-data */
1459 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1460 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1461 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1462 /* change frame type to non QOS */
1463 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1469 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1471 if (unlikely(!rx->sta ||
1472 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1479 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1481 struct sk_buff *skb = rx->skb;
1482 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1485 * Pass through unencrypted frames if the hardware has
1486 * decrypted them already.
1488 if (status->flag & RX_FLAG_DECRYPTED)
1491 /* Drop unencrypted frames if key is set. */
1492 if (unlikely(!ieee80211_has_protected(fc) &&
1493 !ieee80211_is_nullfunc(fc) &&
1494 ieee80211_is_data(fc) &&
1495 (rx->key || rx->sdata->drop_unencrypted)))
1502 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1504 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1505 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1506 __le16 fc = hdr->frame_control;
1509 * Pass through unencrypted frames if the hardware has
1510 * decrypted them already.
1512 if (status->flag & RX_FLAG_DECRYPTED)
1515 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1516 if (unlikely(!ieee80211_has_protected(fc) &&
1517 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1520 /* BIP does not use Protected field, so need to check MMIE */
1521 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1522 ieee80211_get_mmie_keyidx(rx->skb) < 0))
1525 * When using MFP, Action frames are not allowed prior to
1526 * having configured keys.
1528 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1529 ieee80211_is_robust_mgmt_frame(
1530 (struct ieee80211_hdr *) rx->skb->data)))
1538 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1540 struct ieee80211_sub_if_data *sdata = rx->sdata;
1541 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1543 if (ieee80211_has_a4(hdr->frame_control) &&
1544 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1547 if (is_multicast_ether_addr(hdr->addr1) &&
1548 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1549 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
1552 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1556 * requires that rx->skb is a frame with ethernet header
1558 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1560 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1561 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1562 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1565 * Allow EAPOL frames to us/the PAE group address regardless
1566 * of whether the frame was encrypted or not.
1568 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1569 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1570 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1573 if (ieee80211_802_1x_port_control(rx) ||
1574 ieee80211_drop_unencrypted(rx, fc))
1581 * requires that rx->skb is a frame with ethernet header
1584 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1586 struct ieee80211_sub_if_data *sdata = rx->sdata;
1587 struct net_device *dev = sdata->dev;
1588 struct sk_buff *skb, *xmit_skb;
1589 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1590 struct sta_info *dsta;
1591 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1596 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1597 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1598 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1599 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1600 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1601 if (is_multicast_ether_addr(ehdr->h_dest)) {
1603 * send multicast frames both to higher layers in
1604 * local net stack and back to the wireless medium
1606 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1607 if (!xmit_skb && net_ratelimit())
1608 printk(KERN_DEBUG "%s: failed to clone "
1609 "multicast frame\n", dev->name);
1611 dsta = sta_info_get(sdata, skb->data);
1614 * The destination station is associated to
1615 * this AP (in this VLAN), so send the frame
1616 * directly to it and do not pass it to local
1626 int align __maybe_unused;
1628 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1630 * 'align' will only take the values 0 or 2 here
1631 * since all frames are required to be aligned
1632 * to 2-byte boundaries when being passed to
1633 * mac80211. That also explains the __skb_push()
1636 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1638 if (WARN_ON(skb_headroom(skb) < 3)) {
1642 u8 *data = skb->data;
1643 size_t len = skb_headlen(skb);
1645 memmove(skb->data, data, len);
1646 skb_set_tail_pointer(skb, len);
1652 /* deliver to local stack */
1653 skb->protocol = eth_type_trans(skb, dev);
1654 memset(skb->cb, 0, sizeof(skb->cb));
1655 netif_receive_skb(skb);
1660 /* send to wireless media */
1661 xmit_skb->protocol = htons(ETH_P_802_3);
1662 skb_reset_network_header(xmit_skb);
1663 skb_reset_mac_header(xmit_skb);
1664 dev_queue_xmit(xmit_skb);
1668 static ieee80211_rx_result debug_noinline
1669 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1671 struct net_device *dev = rx->sdata->dev;
1672 struct sk_buff *skb = rx->skb;
1673 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1674 __le16 fc = hdr->frame_control;
1675 struct sk_buff_head frame_list;
1676 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1678 if (unlikely(!ieee80211_is_data(fc)))
1681 if (unlikely(!ieee80211_is_data_present(fc)))
1682 return RX_DROP_MONITOR;
1684 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1687 if (ieee80211_has_a4(hdr->frame_control) &&
1688 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1689 !rx->sdata->u.vlan.sta)
1690 return RX_DROP_UNUSABLE;
1692 if (is_multicast_ether_addr(hdr->addr1) &&
1693 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1694 rx->sdata->u.vlan.sta) ||
1695 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1696 rx->sdata->u.mgd.use_4addr)))
1697 return RX_DROP_UNUSABLE;
1700 __skb_queue_head_init(&frame_list);
1702 if (skb_linearize(skb))
1703 return RX_DROP_UNUSABLE;
1705 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1706 rx->sdata->vif.type,
1707 rx->local->hw.extra_tx_headroom);
1709 while (!skb_queue_empty(&frame_list)) {
1710 rx->skb = __skb_dequeue(&frame_list);
1712 if (!ieee80211_frame_allowed(rx, fc)) {
1713 dev_kfree_skb(rx->skb);
1716 dev->stats.rx_packets++;
1717 dev->stats.rx_bytes += rx->skb->len;
1719 ieee80211_deliver_skb(rx);
1725 #ifdef CONFIG_MAC80211_MESH
1726 static ieee80211_rx_result
1727 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1729 struct ieee80211_hdr *hdr;
1730 struct ieee80211s_hdr *mesh_hdr;
1731 unsigned int hdrlen;
1732 struct sk_buff *skb = rx->skb, *fwd_skb;
1733 struct ieee80211_local *local = rx->local;
1734 struct ieee80211_sub_if_data *sdata = rx->sdata;
1735 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1737 hdr = (struct ieee80211_hdr *) skb->data;
1738 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1739 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1741 if (!ieee80211_is_data(hdr->frame_control))
1746 return RX_DROP_MONITOR;
1748 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1749 struct mesh_path *mppath;
1753 if (is_multicast_ether_addr(hdr->addr1)) {
1754 mpp_addr = hdr->addr3;
1755 proxied_addr = mesh_hdr->eaddr1;
1757 mpp_addr = hdr->addr4;
1758 proxied_addr = mesh_hdr->eaddr2;
1762 mppath = mpp_path_lookup(proxied_addr, sdata);
1764 mpp_path_add(proxied_addr, mpp_addr, sdata);
1766 spin_lock_bh(&mppath->state_lock);
1767 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1768 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1769 spin_unlock_bh(&mppath->state_lock);
1774 /* Frame has reached destination. Don't forward */
1775 if (!is_multicast_ether_addr(hdr->addr1) &&
1776 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1781 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1783 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1784 dropped_frames_ttl);
1786 struct ieee80211_hdr *fwd_hdr;
1787 struct ieee80211_tx_info *info;
1789 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1791 if (!fwd_skb && net_ratelimit()) {
1792 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1797 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1798 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1799 info = IEEE80211_SKB_CB(fwd_skb);
1800 memset(info, 0, sizeof(*info));
1801 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1802 info->control.vif = &rx->sdata->vif;
1803 skb_set_queue_mapping(skb,
1804 ieee80211_select_queue(rx->sdata, fwd_skb));
1805 ieee80211_set_qos_hdr(local, skb);
1806 if (is_multicast_ether_addr(fwd_hdr->addr1))
1807 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1812 * Save TA to addr1 to send TA a path error if a
1813 * suitable next hop is not found
1815 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1817 err = mesh_nexthop_lookup(fwd_skb, sdata);
1818 /* Failed to immediately resolve next hop:
1819 * fwded frame was dropped or will be added
1820 * later to the pending skb queue. */
1822 return RX_DROP_MONITOR;
1824 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1827 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1829 ieee80211_add_pending_skb(local, fwd_skb);
1834 if (is_multicast_ether_addr(hdr->addr1) ||
1835 sdata->dev->flags & IFF_PROMISC)
1838 return RX_DROP_MONITOR;
1842 static ieee80211_rx_result debug_noinline
1843 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1845 struct ieee80211_sub_if_data *sdata = rx->sdata;
1846 struct ieee80211_local *local = rx->local;
1847 struct net_device *dev = sdata->dev;
1848 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1849 __le16 fc = hdr->frame_control;
1852 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1855 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1856 return RX_DROP_MONITOR;
1859 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1860 * that a 4-addr station can be detected and moved into a separate VLAN
1862 if (ieee80211_has_a4(hdr->frame_control) &&
1863 sdata->vif.type == NL80211_IFTYPE_AP)
1864 return RX_DROP_MONITOR;
1866 err = __ieee80211_data_to_8023(rx);
1868 return RX_DROP_UNUSABLE;
1870 if (!ieee80211_frame_allowed(rx, fc))
1871 return RX_DROP_MONITOR;
1875 dev->stats.rx_packets++;
1876 dev->stats.rx_bytes += rx->skb->len;
1878 if (ieee80211_is_data(hdr->frame_control) &&
1879 !is_multicast_ether_addr(hdr->addr1) &&
1880 local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1881 mod_timer(&local->dynamic_ps_timer, jiffies +
1882 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1885 ieee80211_deliver_skb(rx);
1890 static ieee80211_rx_result debug_noinline
1891 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
1893 struct ieee80211_local *local = rx->local;
1894 struct ieee80211_hw *hw = &local->hw;
1895 struct sk_buff *skb = rx->skb;
1896 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1897 struct tid_ampdu_rx *tid_agg_rx;
1901 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1904 if (ieee80211_is_back_req(bar->frame_control)) {
1906 __le16 control, start_seq_num;
1907 } __packed bar_data;
1910 return RX_DROP_MONITOR;
1912 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1913 &bar_data, sizeof(bar_data)))
1914 return RX_DROP_MONITOR;
1916 tid = le16_to_cpu(bar_data.control) >> 12;
1918 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1920 return RX_DROP_MONITOR;
1922 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
1924 /* reset session timer */
1925 if (tid_agg_rx->timeout)
1926 mod_timer(&tid_agg_rx->session_timer,
1927 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1929 /* release stored frames up to start of BAR */
1930 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1937 * After this point, we only want management frames,
1938 * so we can drop all remaining control frames to
1939 * cooked monitor interfaces.
1941 return RX_DROP_MONITOR;
1944 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1945 struct ieee80211_mgmt *mgmt,
1948 struct ieee80211_local *local = sdata->local;
1949 struct sk_buff *skb;
1950 struct ieee80211_mgmt *resp;
1952 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
1953 /* Not to own unicast address */
1957 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1958 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1959 /* Not from the current AP or not associated yet. */
1963 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1964 /* Too short SA Query request frame */
1968 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1972 skb_reserve(skb, local->hw.extra_tx_headroom);
1973 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1974 memset(resp, 0, 24);
1975 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1976 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
1977 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1978 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1979 IEEE80211_STYPE_ACTION);
1980 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1981 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1982 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1983 memcpy(resp->u.action.u.sa_query.trans_id,
1984 mgmt->u.action.u.sa_query.trans_id,
1985 WLAN_SA_QUERY_TR_ID_LEN);
1987 ieee80211_tx_skb(sdata, skb);
1990 static ieee80211_rx_result debug_noinline
1991 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
1993 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1994 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1997 * From here on, look only at management frames.
1998 * Data and control frames are already handled,
1999 * and unknown (reserved) frames are useless.
2001 if (rx->skb->len < 24)
2002 return RX_DROP_MONITOR;
2004 if (!ieee80211_is_mgmt(mgmt->frame_control))
2005 return RX_DROP_MONITOR;
2007 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2008 return RX_DROP_MONITOR;
2010 if (ieee80211_drop_unencrypted_mgmt(rx))
2011 return RX_DROP_UNUSABLE;
2016 static ieee80211_rx_result debug_noinline
2017 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2019 struct ieee80211_local *local = rx->local;
2020 struct ieee80211_sub_if_data *sdata = rx->sdata;
2021 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2022 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2023 int len = rx->skb->len;
2025 if (!ieee80211_is_action(mgmt->frame_control))
2028 /* drop too small frames */
2029 if (len < IEEE80211_MIN_ACTION_SIZE)
2030 return RX_DROP_UNUSABLE;
2032 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2033 return RX_DROP_UNUSABLE;
2035 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2036 return RX_DROP_UNUSABLE;
2038 switch (mgmt->u.action.category) {
2039 case WLAN_CATEGORY_BACK:
2041 * The aggregation code is not prepared to handle
2042 * anything but STA/AP due to the BSSID handling;
2043 * IBSS could work in the code but isn't supported
2044 * by drivers or the standard.
2046 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2047 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2048 sdata->vif.type != NL80211_IFTYPE_AP)
2051 /* verify action_code is present */
2052 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2055 switch (mgmt->u.action.u.addba_req.action_code) {
2056 case WLAN_ACTION_ADDBA_REQ:
2057 if (len < (IEEE80211_MIN_ACTION_SIZE +
2058 sizeof(mgmt->u.action.u.addba_req)))
2061 case WLAN_ACTION_ADDBA_RESP:
2062 if (len < (IEEE80211_MIN_ACTION_SIZE +
2063 sizeof(mgmt->u.action.u.addba_resp)))
2066 case WLAN_ACTION_DELBA:
2067 if (len < (IEEE80211_MIN_ACTION_SIZE +
2068 sizeof(mgmt->u.action.u.delba)))
2076 case WLAN_CATEGORY_SPECTRUM_MGMT:
2077 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2080 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2083 /* verify action_code is present */
2084 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2087 switch (mgmt->u.action.u.measurement.action_code) {
2088 case WLAN_ACTION_SPCT_MSR_REQ:
2089 if (len < (IEEE80211_MIN_ACTION_SIZE +
2090 sizeof(mgmt->u.action.u.measurement)))
2092 ieee80211_process_measurement_req(sdata, mgmt, len);
2094 case WLAN_ACTION_SPCT_CHL_SWITCH:
2095 if (len < (IEEE80211_MIN_ACTION_SIZE +
2096 sizeof(mgmt->u.action.u.chan_switch)))
2099 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2102 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2108 case WLAN_CATEGORY_SA_QUERY:
2109 if (len < (IEEE80211_MIN_ACTION_SIZE +
2110 sizeof(mgmt->u.action.u.sa_query)))
2113 switch (mgmt->u.action.u.sa_query.action) {
2114 case WLAN_ACTION_SA_QUERY_REQUEST:
2115 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2117 ieee80211_process_sa_query_req(sdata, mgmt, len);
2121 case WLAN_CATEGORY_MESH_PLINK:
2122 case WLAN_CATEGORY_MESH_PATH_SEL:
2123 if (!ieee80211_vif_is_mesh(&sdata->vif))
2131 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2132 /* will return in the next handlers */
2137 rx->sta->rx_packets++;
2138 dev_kfree_skb(rx->skb);
2142 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2143 skb_queue_tail(&sdata->skb_queue, rx->skb);
2144 ieee80211_queue_work(&local->hw, &sdata->work);
2146 rx->sta->rx_packets++;
2150 static ieee80211_rx_result debug_noinline
2151 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2153 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2155 /* skip known-bad action frames and return them in the next handler */
2156 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2160 * Getting here means the kernel doesn't know how to handle
2161 * it, but maybe userspace does ... include returned frames
2162 * so userspace can register for those to know whether ones
2163 * it transmitted were processed or returned.
2166 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2167 rx->skb->data, rx->skb->len,
2170 rx->sta->rx_packets++;
2171 dev_kfree_skb(rx->skb);
2179 static ieee80211_rx_result debug_noinline
2180 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2182 struct ieee80211_local *local = rx->local;
2183 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2184 struct sk_buff *nskb;
2185 struct ieee80211_sub_if_data *sdata = rx->sdata;
2186 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2188 if (!ieee80211_is_action(mgmt->frame_control))
2192 * For AP mode, hostapd is responsible for handling any action
2193 * frames that we didn't handle, including returning unknown
2194 * ones. For all other modes we will return them to the sender,
2195 * setting the 0x80 bit in the action category, as required by
2196 * 802.11-2007 7.3.1.11.
2197 * Newer versions of hostapd shall also use the management frame
2198 * registration mechanisms, but older ones still use cooked
2199 * monitor interfaces so push all frames there.
2201 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2202 (sdata->vif.type == NL80211_IFTYPE_AP ||
2203 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2204 return RX_DROP_MONITOR;
2206 /* do not return rejected action frames */
2207 if (mgmt->u.action.category & 0x80)
2208 return RX_DROP_UNUSABLE;
2210 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2213 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2215 nmgmt->u.action.category |= 0x80;
2216 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2217 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2219 memset(nskb->cb, 0, sizeof(nskb->cb));
2221 ieee80211_tx_skb(rx->sdata, nskb);
2223 dev_kfree_skb(rx->skb);
2227 static ieee80211_rx_result debug_noinline
2228 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2230 struct ieee80211_sub_if_data *sdata = rx->sdata;
2231 ieee80211_rx_result rxs;
2232 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2235 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2236 if (rxs != RX_CONTINUE)
2239 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2241 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2242 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2243 sdata->vif.type != NL80211_IFTYPE_STATION)
2244 return RX_DROP_MONITOR;
2247 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2248 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2249 /* process for all: mesh, mlme, ibss */
2251 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2252 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2253 if (is_multicast_ether_addr(mgmt->da) &&
2254 !is_broadcast_ether_addr(mgmt->da))
2255 return RX_DROP_MONITOR;
2257 /* process only for station */
2258 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2259 return RX_DROP_MONITOR;
2261 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2262 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2263 /* process only for ibss */
2264 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2265 return RX_DROP_MONITOR;
2268 return RX_DROP_MONITOR;
2271 /* queue up frame and kick off work to process it */
2272 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2273 skb_queue_tail(&sdata->skb_queue, rx->skb);
2274 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2276 rx->sta->rx_packets++;
2281 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
2282 struct ieee80211_rx_data *rx)
2285 unsigned int hdrlen;
2287 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2288 if (rx->skb->len >= hdrlen + 4)
2289 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2295 * Some hardware seem to generate incorrect Michael MIC
2296 * reports; ignore them to avoid triggering countermeasures.
2301 if (!ieee80211_has_protected(hdr->frame_control))
2304 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
2306 * APs with pairwise keys should never receive Michael MIC
2307 * errors for non-zero keyidx because these are reserved for
2308 * group keys and only the AP is sending real multicast
2309 * frames in the BSS.
2314 if (!ieee80211_is_data(hdr->frame_control) &&
2315 !ieee80211_is_auth(hdr->frame_control))
2318 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2322 /* TODO: use IEEE80211_RX_FRAGMENTED */
2323 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2324 struct ieee80211_rate *rate)
2326 struct ieee80211_sub_if_data *sdata;
2327 struct ieee80211_local *local = rx->local;
2328 struct ieee80211_rtap_hdr {
2329 struct ieee80211_radiotap_header hdr;
2335 struct sk_buff *skb = rx->skb, *skb2;
2336 struct net_device *prev_dev = NULL;
2337 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2340 * If cooked monitor has been processed already, then
2341 * don't do it again. If not, set the flag.
2343 if (rx->flags & IEEE80211_RX_CMNTR)
2345 rx->flags |= IEEE80211_RX_CMNTR;
2347 if (skb_headroom(skb) < sizeof(*rthdr) &&
2348 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2351 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2352 memset(rthdr, 0, sizeof(*rthdr));
2353 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2354 rthdr->hdr.it_present =
2355 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2356 (1 << IEEE80211_RADIOTAP_CHANNEL));
2359 rthdr->rate_or_pad = rate->bitrate / 5;
2360 rthdr->hdr.it_present |=
2361 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2363 rthdr->chan_freq = cpu_to_le16(status->freq);
2365 if (status->band == IEEE80211_BAND_5GHZ)
2366 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2367 IEEE80211_CHAN_5GHZ);
2369 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2370 IEEE80211_CHAN_2GHZ);
2372 skb_set_mac_header(skb, 0);
2373 skb->ip_summed = CHECKSUM_UNNECESSARY;
2374 skb->pkt_type = PACKET_OTHERHOST;
2375 skb->protocol = htons(ETH_P_802_2);
2377 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2378 if (!ieee80211_sdata_running(sdata))
2381 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2382 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2386 skb2 = skb_clone(skb, GFP_ATOMIC);
2388 skb2->dev = prev_dev;
2389 netif_receive_skb(skb2);
2393 prev_dev = sdata->dev;
2394 sdata->dev->stats.rx_packets++;
2395 sdata->dev->stats.rx_bytes += skb->len;
2399 skb->dev = prev_dev;
2400 netif_receive_skb(skb);
2408 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2409 ieee80211_rx_result res)
2412 case RX_DROP_MONITOR:
2413 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2415 rx->sta->rx_dropped++;
2418 struct ieee80211_rate *rate = NULL;
2419 struct ieee80211_supported_band *sband;
2420 struct ieee80211_rx_status *status;
2422 status = IEEE80211_SKB_RXCB((rx->skb));
2424 sband = rx->local->hw.wiphy->bands[status->band];
2425 if (!(status->flag & RX_FLAG_HT))
2426 rate = &sband->bitrates[status->rate_idx];
2428 ieee80211_rx_cooked_monitor(rx, rate);
2431 case RX_DROP_UNUSABLE:
2432 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2434 rx->sta->rx_dropped++;
2435 dev_kfree_skb(rx->skb);
2438 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2443 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2444 struct sk_buff_head *frames)
2446 ieee80211_rx_result res = RX_DROP_MONITOR;
2447 struct sk_buff *skb;
2449 #define CALL_RXH(rxh) \
2452 if (res != RX_CONTINUE) \
2456 while ((skb = __skb_dequeue(frames))) {
2458 * all the other fields are valid across frames
2459 * that belong to an aMPDU since they are on the
2460 * same TID from the same station
2465 CALL_RXH(ieee80211_rx_h_decrypt)
2466 CALL_RXH(ieee80211_rx_h_check_more_data)
2467 CALL_RXH(ieee80211_rx_h_sta_process)
2468 CALL_RXH(ieee80211_rx_h_defragment)
2469 CALL_RXH(ieee80211_rx_h_ps_poll)
2470 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2471 /* must be after MMIC verify so header is counted in MPDU mic */
2472 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2473 CALL_RXH(ieee80211_rx_h_amsdu)
2474 #ifdef CONFIG_MAC80211_MESH
2475 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2476 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2478 CALL_RXH(ieee80211_rx_h_data)
2480 /* special treatment -- needs the queue */
2481 res = ieee80211_rx_h_ctrl(rx, frames);
2482 if (res != RX_CONTINUE)
2485 CALL_RXH(ieee80211_rx_h_mgmt_check)
2486 CALL_RXH(ieee80211_rx_h_action)
2487 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2488 CALL_RXH(ieee80211_rx_h_action_return)
2489 CALL_RXH(ieee80211_rx_h_mgmt)
2492 ieee80211_rx_handlers_result(rx, res);
2498 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2500 struct sk_buff_head reorder_release;
2501 ieee80211_rx_result res = RX_DROP_MONITOR;
2503 __skb_queue_head_init(&reorder_release);
2505 #define CALL_RXH(rxh) \
2508 if (res != RX_CONTINUE) \
2512 CALL_RXH(ieee80211_rx_h_passive_scan)
2513 CALL_RXH(ieee80211_rx_h_check)
2515 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2517 ieee80211_rx_handlers(rx, &reorder_release);
2521 ieee80211_rx_handlers_result(rx, res);
2527 * This function makes calls into the RX path. Therefore the
2528 * caller must hold the sta_info->lock and everything has to
2529 * be under rcu_read_lock protection as well.
2531 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2533 struct sk_buff_head frames;
2534 struct ieee80211_rx_data rx = {
2536 .sdata = sta->sdata,
2537 .local = sta->local,
2540 struct tid_ampdu_rx *tid_agg_rx;
2542 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2546 __skb_queue_head_init(&frames);
2548 spin_lock(&tid_agg_rx->reorder_lock);
2549 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
2550 spin_unlock(&tid_agg_rx->reorder_lock);
2552 ieee80211_rx_handlers(&rx, &frames);
2555 /* main receive path */
2557 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2558 struct ieee80211_hdr *hdr)
2560 struct ieee80211_sub_if_data *sdata = rx->sdata;
2561 struct sk_buff *skb = rx->skb;
2562 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2563 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2564 int multicast = is_multicast_ether_addr(hdr->addr1);
2566 switch (sdata->vif.type) {
2567 case NL80211_IFTYPE_STATION:
2568 if (!bssid && !sdata->u.mgd.use_4addr)
2571 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2572 if (!(sdata->dev->flags & IFF_PROMISC))
2574 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2577 case NL80211_IFTYPE_ADHOC:
2580 if (ieee80211_is_beacon(hdr->frame_control)) {
2583 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2584 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2586 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2587 } else if (!multicast &&
2588 compare_ether_addr(sdata->vif.addr,
2590 if (!(sdata->dev->flags & IFF_PROMISC))
2592 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2593 } else if (!rx->sta) {
2595 if (status->flag & RX_FLAG_HT)
2596 rate_idx = 0; /* TODO: HT rates */
2598 rate_idx = status->rate_idx;
2599 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2600 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2603 case NL80211_IFTYPE_MESH_POINT:
2605 compare_ether_addr(sdata->vif.addr,
2607 if (!(sdata->dev->flags & IFF_PROMISC))
2610 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2613 case NL80211_IFTYPE_AP_VLAN:
2614 case NL80211_IFTYPE_AP:
2616 if (compare_ether_addr(sdata->vif.addr,
2619 } else if (!ieee80211_bssid_match(bssid,
2621 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2623 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2626 case NL80211_IFTYPE_WDS:
2627 if (bssid || !ieee80211_is_data(hdr->frame_control))
2629 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2633 /* should never get here */
2642 * This function returns whether or not the SKB
2643 * was destined for RX processing or not, which,
2644 * if consume is true, is equivalent to whether
2645 * or not the skb was consumed.
2647 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2648 struct sk_buff *skb, bool consume)
2650 struct ieee80211_local *local = rx->local;
2651 struct ieee80211_sub_if_data *sdata = rx->sdata;
2652 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2653 struct ieee80211_hdr *hdr = (void *)skb->data;
2657 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2658 prepares = prepare_for_handlers(rx, hdr);
2663 if (status->flag & RX_FLAG_MMIC_ERROR) {
2664 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
2665 ieee80211_rx_michael_mic_report(hdr, rx);
2670 skb = skb_copy(skb, GFP_ATOMIC);
2672 if (net_ratelimit())
2673 wiphy_debug(local->hw.wiphy,
2674 "failed to copy multicast frame for %s\n",
2682 ieee80211_invoke_rx_handlers(rx);
2687 * This is the actual Rx frames handler. as it blongs to Rx path it must
2688 * be called with rcu_read_lock protection.
2690 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2691 struct sk_buff *skb)
2693 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2694 struct ieee80211_local *local = hw_to_local(hw);
2695 struct ieee80211_sub_if_data *sdata;
2696 struct ieee80211_hdr *hdr;
2698 struct ieee80211_rx_data rx;
2699 struct ieee80211_sub_if_data *prev;
2700 struct sta_info *sta, *tmp, *prev_sta;
2703 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2704 memset(&rx, 0, sizeof(rx));
2708 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2709 local->dot11ReceivedFragmentCount++;
2711 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2712 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2713 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2715 if (ieee80211_is_mgmt(fc))
2716 err = skb_linearize(skb);
2718 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2725 hdr = (struct ieee80211_hdr *)skb->data;
2726 ieee80211_parse_qos(&rx);
2727 ieee80211_verify_alignment(&rx);
2729 if (ieee80211_is_data(fc)) {
2732 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2739 rx.sdata = prev_sta->sdata;
2740 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2747 rx.sdata = prev_sta->sdata;
2749 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2757 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2758 if (!ieee80211_sdata_running(sdata))
2761 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2762 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2766 * frame is destined for this interface, but if it's
2767 * not also for the previous one we handle that after
2768 * the loop to avoid copying the SKB once too much
2776 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2778 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2784 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2787 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2796 * This is the receive path handler. It is called by a low level driver when an
2797 * 802.11 MPDU is received from the hardware.
2799 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2801 struct ieee80211_local *local = hw_to_local(hw);
2802 struct ieee80211_rate *rate = NULL;
2803 struct ieee80211_supported_band *sband;
2804 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2806 WARN_ON_ONCE(softirq_count() == 0);
2808 if (WARN_ON(status->band < 0 ||
2809 status->band >= IEEE80211_NUM_BANDS))
2812 sband = local->hw.wiphy->bands[status->band];
2813 if (WARN_ON(!sband))
2817 * If we're suspending, it is possible although not too likely
2818 * that we'd be receiving frames after having already partially
2819 * quiesced the stack. We can't process such frames then since
2820 * that might, for example, cause stations to be added or other
2821 * driver callbacks be invoked.
2823 if (unlikely(local->quiescing || local->suspended))
2827 * The same happens when we're not even started,
2828 * but that's worth a warning.
2830 if (WARN_ON(!local->started))
2833 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
2835 * Validate the rate, unless a PLCP error means that
2836 * we probably can't have a valid rate here anyway.
2839 if (status->flag & RX_FLAG_HT) {
2841 * rate_idx is MCS index, which can be [0-76]
2844 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2846 * Anything else would be some sort of driver or
2847 * hardware error. The driver should catch hardware
2850 if (WARN((status->rate_idx < 0 ||
2851 status->rate_idx > 76),
2852 "Rate marked as an HT rate but passed "
2853 "status->rate_idx is not "
2854 "an MCS index [0-76]: %d (0x%02x)\n",
2859 if (WARN_ON(status->rate_idx < 0 ||
2860 status->rate_idx >= sband->n_bitrates))
2862 rate = &sband->bitrates[status->rate_idx];
2866 status->rx_flags = 0;
2869 * key references and virtual interfaces are protected using RCU
2870 * and this requires that we are in a read-side RCU section during
2871 * receive processing
2876 * Frames with failed FCS/PLCP checksum are not returned,
2877 * all other frames are returned without radiotap header
2878 * if it was previously present.
2879 * Also, frames with less than 16 bytes are dropped.
2881 skb = ieee80211_rx_monitor(local, skb, rate);
2887 __ieee80211_rx_handle_packet(hw, skb);
2895 EXPORT_SYMBOL(ieee80211_rx);
2897 /* This is a version of the rx handler that can be called from hard irq
2898 * context. Post the skb on the queue and schedule the tasklet */
2899 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2901 struct ieee80211_local *local = hw_to_local(hw);
2903 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2905 skb->pkt_type = IEEE80211_RX_MSG;
2906 skb_queue_tail(&local->skb_queue, skb);
2907 tasklet_schedule(&local->tasklet);
2909 EXPORT_SYMBOL(ieee80211_rx_irqsafe);