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 <linux/export.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
22 #include <asm/unaligned.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
35 * monitor mode reception
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
45 __pskb_trim(skb, skb->len - FCS_LEN);
57 static inline int should_drop_frame(struct sk_buff *skb,
60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
61 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
65 if (unlikely(skb->len < 16 + present_fcs_len))
67 if (ieee80211_is_ctl(hdr->frame_control) &&
68 !ieee80211_is_pspoll(hdr->frame_control) &&
69 !ieee80211_is_back_req(hdr->frame_control))
75 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
76 struct ieee80211_rx_status *status)
80 /* always present fields */
81 len = sizeof(struct ieee80211_radiotap_header) + 9;
83 if (status->flag & RX_FLAG_MACTIME_MPDU)
85 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
88 if (len & 1) /* padding for RX_FLAGS if necessary */
91 if (status->flag & RX_FLAG_HT) /* HT info */
98 * ieee80211_add_rx_radiotap_header - add radiotap header
100 * add a radiotap header containing all the fields which the hardware provided.
103 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
105 struct ieee80211_rate *rate,
106 int rtap_len, bool has_fcs)
108 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
109 struct ieee80211_radiotap_header *rthdr;
113 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
114 memset(rthdr, 0, rtap_len);
116 /* radiotap header, set always present flags */
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
119 (1 << IEEE80211_RADIOTAP_CHANNEL) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
122 rthdr->it_len = cpu_to_le16(rtap_len);
124 pos = (unsigned char *)(rthdr+1);
126 /* the order of the following fields is important */
128 /* IEEE80211_RADIOTAP_TSFT */
129 if (status->flag & RX_FLAG_MACTIME_MPDU) {
130 put_unaligned_le64(status->mactime, pos);
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
136 /* IEEE80211_RADIOTAP_FLAGS */
137 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
138 *pos |= IEEE80211_RADIOTAP_F_FCS;
139 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
140 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
141 if (status->flag & RX_FLAG_SHORTPRE)
142 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
145 /* IEEE80211_RADIOTAP_RATE */
146 if (!rate || status->flag & RX_FLAG_HT) {
148 * Without rate information don't add it. If we have,
149 * MCS information is a separate field in radiotap,
150 * added below. The byte here is needed as padding
151 * for the channel though, so initialise it to 0.
155 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
156 *pos = rate->bitrate / 5;
160 /* IEEE80211_RADIOTAP_CHANNEL */
161 put_unaligned_le16(status->freq, pos);
163 if (status->band == IEEE80211_BAND_5GHZ)
164 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
166 else if (status->flag & RX_FLAG_HT)
167 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
169 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
170 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
173 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
176 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
180 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
181 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
182 *pos = status->signal;
184 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
188 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
190 /* IEEE80211_RADIOTAP_ANTENNA */
191 *pos = status->antenna;
194 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
196 /* IEEE80211_RADIOTAP_RX_FLAGS */
197 /* ensure 2 byte alignment for the 2 byte field as required */
198 if ((pos - (u8 *)rthdr) & 1)
200 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
201 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
202 put_unaligned_le16(rx_flags, pos);
205 if (status->flag & RX_FLAG_HT) {
206 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
207 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
208 IEEE80211_RADIOTAP_MCS_HAVE_GI |
209 IEEE80211_RADIOTAP_MCS_HAVE_BW;
211 if (status->flag & RX_FLAG_SHORT_GI)
212 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
213 if (status->flag & RX_FLAG_40MHZ)
214 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
216 *pos++ = status->rate_idx;
221 * This function copies a received frame to all monitor interfaces and
222 * returns a cleaned-up SKB that no longer includes the FCS nor the
223 * radiotap header the driver might have added.
225 static struct sk_buff *
226 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
227 struct ieee80211_rate *rate)
229 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
230 struct ieee80211_sub_if_data *sdata;
232 struct sk_buff *skb, *skb2;
233 struct net_device *prev_dev = NULL;
234 int present_fcs_len = 0;
237 * First, we may need to make a copy of the skb because
238 * (1) we need to modify it for radiotap (if not present), and
239 * (2) the other RX handlers will modify the skb we got.
241 * We don't need to, of course, if we aren't going to return
242 * the SKB because it has a bad FCS/PLCP checksum.
245 /* room for the radiotap header based on driver features */
246 needed_headroom = ieee80211_rx_radiotap_len(local, status);
248 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
249 present_fcs_len = FCS_LEN;
251 /* make sure hdr->frame_control is on the linear part */
252 if (!pskb_may_pull(origskb, 2)) {
253 dev_kfree_skb(origskb);
257 if (!local->monitors) {
258 if (should_drop_frame(origskb, present_fcs_len)) {
259 dev_kfree_skb(origskb);
263 return remove_monitor_info(local, origskb);
266 if (should_drop_frame(origskb, present_fcs_len)) {
267 /* only need to expand headroom if necessary */
272 * This shouldn't trigger often because most devices have an
273 * RX header they pull before we get here, and that should
274 * be big enough for our radiotap information. We should
275 * probably export the length to drivers so that we can have
276 * them allocate enough headroom to start with.
278 if (skb_headroom(skb) < needed_headroom &&
279 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
285 * Need to make a copy and possibly remove radiotap header
286 * and FCS from the original.
288 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
290 origskb = remove_monitor_info(local, origskb);
296 /* prepend radiotap information */
297 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
300 skb_reset_mac_header(skb);
301 skb->ip_summed = CHECKSUM_UNNECESSARY;
302 skb->pkt_type = PACKET_OTHERHOST;
303 skb->protocol = htons(ETH_P_802_2);
305 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
306 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
309 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
312 if (!ieee80211_sdata_running(sdata))
316 skb2 = skb_clone(skb, GFP_ATOMIC);
318 skb2->dev = prev_dev;
319 netif_receive_skb(skb2);
323 prev_dev = sdata->dev;
324 sdata->dev->stats.rx_packets++;
325 sdata->dev->stats.rx_bytes += skb->len;
330 netif_receive_skb(skb);
338 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
340 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
341 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
342 int tid, seqno_idx, security_idx;
344 /* does the frame have a qos control field? */
345 if (ieee80211_is_data_qos(hdr->frame_control)) {
346 u8 *qc = ieee80211_get_qos_ctl(hdr);
347 /* frame has qos control */
348 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
349 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
350 status->rx_flags |= IEEE80211_RX_AMSDU;
356 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
358 * Sequence numbers for management frames, QoS data
359 * frames with a broadcast/multicast address in the
360 * Address 1 field, and all non-QoS data frames sent
361 * by QoS STAs are assigned using an additional single
362 * modulo-4096 counter, [...]
364 * We also use that counter for non-QoS STAs.
366 seqno_idx = NUM_RX_DATA_QUEUES;
368 if (ieee80211_is_mgmt(hdr->frame_control))
369 security_idx = NUM_RX_DATA_QUEUES;
373 rx->seqno_idx = seqno_idx;
374 rx->security_idx = security_idx;
375 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
376 * For now, set skb->priority to 0 for other cases. */
377 rx->skb->priority = (tid > 7) ? 0 : tid;
381 * DOC: Packet alignment
383 * Drivers always need to pass packets that are aligned to two-byte boundaries
386 * Additionally, should, if possible, align the payload data in a way that
387 * guarantees that the contained IP header is aligned to a four-byte
388 * boundary. In the case of regular frames, this simply means aligning the
389 * payload to a four-byte boundary (because either the IP header is directly
390 * contained, or IV/RFC1042 headers that have a length divisible by four are
391 * in front of it). If the payload data is not properly aligned and the
392 * architecture doesn't support efficient unaligned operations, mac80211
393 * will align the data.
395 * With A-MSDU frames, however, the payload data address must yield two modulo
396 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
397 * push the IP header further back to a multiple of four again. Thankfully, the
398 * specs were sane enough this time around to require padding each A-MSDU
399 * subframe to a length that is a multiple of four.
401 * Padding like Atheros hardware adds which is between the 802.11 header and
402 * the payload is not supported, the driver is required to move the 802.11
403 * header to be directly in front of the payload in that case.
405 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
407 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
408 WARN_ONCE((unsigned long)rx->skb->data & 1,
409 "unaligned packet at 0x%p\n", rx->skb->data);
416 static ieee80211_rx_result debug_noinline
417 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
419 struct ieee80211_local *local = rx->local;
420 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
421 struct sk_buff *skb = rx->skb;
423 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
424 !local->sched_scanning))
427 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
428 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
429 local->sched_scanning)
430 return ieee80211_scan_rx(rx->sdata, skb);
432 /* scanning finished during invoking of handlers */
433 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
434 return RX_DROP_UNUSABLE;
438 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
440 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
442 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
445 return ieee80211_is_robust_mgmt_frame(hdr);
449 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
451 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
453 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
456 return ieee80211_is_robust_mgmt_frame(hdr);
460 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
461 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
463 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
464 struct ieee80211_mmie *mmie;
466 if (skb->len < 24 + sizeof(*mmie) ||
467 !is_multicast_ether_addr(hdr->da))
470 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
471 return -1; /* not a robust management frame */
473 mmie = (struct ieee80211_mmie *)
474 (skb->data + skb->len - sizeof(*mmie));
475 if (mmie->element_id != WLAN_EID_MMIE ||
476 mmie->length != sizeof(*mmie) - 2)
479 return le16_to_cpu(mmie->key_id);
483 static ieee80211_rx_result
484 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
486 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
487 char *dev_addr = rx->sdata->vif.addr;
489 if (ieee80211_is_data(hdr->frame_control)) {
490 if (is_multicast_ether_addr(hdr->addr1)) {
491 if (ieee80211_has_tods(hdr->frame_control) ||
492 !ieee80211_has_fromds(hdr->frame_control))
493 return RX_DROP_MONITOR;
494 if (compare_ether_addr(hdr->addr3, dev_addr) == 0)
495 return RX_DROP_MONITOR;
497 if (!ieee80211_has_a4(hdr->frame_control))
498 return RX_DROP_MONITOR;
499 if (compare_ether_addr(hdr->addr4, dev_addr) == 0)
500 return RX_DROP_MONITOR;
504 /* If there is not an established peer link and this is not a peer link
505 * establisment frame, beacon or probe, drop the frame.
508 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
509 struct ieee80211_mgmt *mgmt;
511 if (!ieee80211_is_mgmt(hdr->frame_control))
512 return RX_DROP_MONITOR;
514 if (ieee80211_is_action(hdr->frame_control)) {
516 mgmt = (struct ieee80211_mgmt *)hdr;
517 category = mgmt->u.action.category;
518 if (category != WLAN_CATEGORY_MESH_ACTION &&
519 category != WLAN_CATEGORY_SELF_PROTECTED)
520 return RX_DROP_MONITOR;
524 if (ieee80211_is_probe_req(hdr->frame_control) ||
525 ieee80211_is_probe_resp(hdr->frame_control) ||
526 ieee80211_is_beacon(hdr->frame_control) ||
527 ieee80211_is_auth(hdr->frame_control))
530 return RX_DROP_MONITOR;
537 #define SEQ_MODULO 0x1000
538 #define SEQ_MASK 0xfff
540 static inline int seq_less(u16 sq1, u16 sq2)
542 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
545 static inline u16 seq_inc(u16 sq)
547 return (sq + 1) & SEQ_MASK;
550 static inline u16 seq_sub(u16 sq1, u16 sq2)
552 return (sq1 - sq2) & SEQ_MASK;
556 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
557 struct tid_ampdu_rx *tid_agg_rx,
560 struct ieee80211_local *local = hw_to_local(hw);
561 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
562 struct ieee80211_rx_status *status;
564 lockdep_assert_held(&tid_agg_rx->reorder_lock);
569 /* release the frame from the reorder ring buffer */
570 tid_agg_rx->stored_mpdu_num--;
571 tid_agg_rx->reorder_buf[index] = NULL;
572 status = IEEE80211_SKB_RXCB(skb);
573 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
574 skb_queue_tail(&local->rx_skb_queue, skb);
577 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
580 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
581 struct tid_ampdu_rx *tid_agg_rx,
586 lockdep_assert_held(&tid_agg_rx->reorder_lock);
588 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
589 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
590 tid_agg_rx->buf_size;
591 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
596 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
597 * the skb was added to the buffer longer than this time ago, the earlier
598 * frames that have not yet been received are assumed to be lost and the skb
599 * can be released for processing. This may also release other skb's from the
600 * reorder buffer if there are no additional gaps between the frames.
602 * Callers must hold tid_agg_rx->reorder_lock.
604 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
606 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
607 struct tid_ampdu_rx *tid_agg_rx)
611 lockdep_assert_held(&tid_agg_rx->reorder_lock);
613 /* release the buffer until next missing frame */
614 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
615 tid_agg_rx->buf_size;
616 if (!tid_agg_rx->reorder_buf[index] &&
617 tid_agg_rx->stored_mpdu_num) {
619 * No buffers ready to be released, but check whether any
620 * frames in the reorder buffer have timed out.
623 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
624 j = (j + 1) % tid_agg_rx->buf_size) {
625 if (!tid_agg_rx->reorder_buf[j]) {
630 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
631 HT_RX_REORDER_BUF_TIMEOUT))
632 goto set_release_timer;
634 #ifdef CONFIG_MAC80211_HT_DEBUG
636 wiphy_debug(hw->wiphy,
637 "release an RX reorder frame due to timeout on earlier frames\n");
639 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
642 * Increment the head seq# also for the skipped slots.
644 tid_agg_rx->head_seq_num =
645 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
648 } else while (tid_agg_rx->reorder_buf[index]) {
649 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
650 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
651 tid_agg_rx->buf_size;
654 if (tid_agg_rx->stored_mpdu_num) {
655 j = index = seq_sub(tid_agg_rx->head_seq_num,
656 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
658 for (; j != (index - 1) % tid_agg_rx->buf_size;
659 j = (j + 1) % tid_agg_rx->buf_size) {
660 if (tid_agg_rx->reorder_buf[j])
666 mod_timer(&tid_agg_rx->reorder_timer,
667 tid_agg_rx->reorder_time[j] + 1 +
668 HT_RX_REORDER_BUF_TIMEOUT);
670 del_timer(&tid_agg_rx->reorder_timer);
675 * As this function belongs to the RX path it must be under
676 * rcu_read_lock protection. It returns false if the frame
677 * can be processed immediately, true if it was consumed.
679 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
680 struct tid_ampdu_rx *tid_agg_rx,
683 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
684 u16 sc = le16_to_cpu(hdr->seq_ctrl);
685 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
686 u16 head_seq_num, buf_size;
690 spin_lock(&tid_agg_rx->reorder_lock);
692 buf_size = tid_agg_rx->buf_size;
693 head_seq_num = tid_agg_rx->head_seq_num;
695 /* frame with out of date sequence number */
696 if (seq_less(mpdu_seq_num, head_seq_num)) {
702 * If frame the sequence number exceeds our buffering window
703 * size release some previous frames to make room for this one.
705 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
706 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
707 /* release stored frames up to new head to stack */
708 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
711 /* Now the new frame is always in the range of the reordering buffer */
713 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
715 /* check if we already stored this frame */
716 if (tid_agg_rx->reorder_buf[index]) {
722 * If the current MPDU is in the right order and nothing else
723 * is stored we can process it directly, no need to buffer it.
724 * If it is first but there's something stored, we may be able
725 * to release frames after this one.
727 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
728 tid_agg_rx->stored_mpdu_num == 0) {
729 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
734 /* put the frame in the reordering buffer */
735 tid_agg_rx->reorder_buf[index] = skb;
736 tid_agg_rx->reorder_time[index] = jiffies;
737 tid_agg_rx->stored_mpdu_num++;
738 ieee80211_sta_reorder_release(hw, tid_agg_rx);
741 spin_unlock(&tid_agg_rx->reorder_lock);
746 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
747 * true if the MPDU was buffered, false if it should be processed.
749 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
751 struct sk_buff *skb = rx->skb;
752 struct ieee80211_local *local = rx->local;
753 struct ieee80211_hw *hw = &local->hw;
754 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
755 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
756 struct sta_info *sta = rx->sta;
757 struct tid_ampdu_rx *tid_agg_rx;
761 if (!ieee80211_is_data_qos(hdr->frame_control))
765 * filter the QoS data rx stream according to
766 * STA/TID and check if this STA/TID is on aggregation
772 ack_policy = *ieee80211_get_qos_ctl(hdr) &
773 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
774 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
776 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
780 /* qos null data frames are excluded */
781 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
784 /* not part of a BA session */
785 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
786 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
789 /* not actually part of this BA session */
790 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
793 /* new, potentially un-ordered, ampdu frame - process it */
795 /* reset session timer */
796 if (tid_agg_rx->timeout)
797 mod_timer(&tid_agg_rx->session_timer,
798 TU_TO_EXP_TIME(tid_agg_rx->timeout));
800 /* if this mpdu is fragmented - terminate rx aggregation session */
801 sc = le16_to_cpu(hdr->seq_ctrl);
802 if (sc & IEEE80211_SCTL_FRAG) {
803 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
804 skb_queue_tail(&rx->sdata->skb_queue, skb);
805 ieee80211_queue_work(&local->hw, &rx->sdata->work);
810 * No locking needed -- we will only ever process one
811 * RX packet at a time, and thus own tid_agg_rx. All
812 * other code manipulating it needs to (and does) make
813 * sure that we cannot get to it any more before doing
816 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
820 skb_queue_tail(&local->rx_skb_queue, skb);
823 static ieee80211_rx_result debug_noinline
824 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
826 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
827 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
829 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
830 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
831 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
832 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
834 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
835 rx->local->dot11FrameDuplicateCount++;
836 rx->sta->num_duplicates++;
838 return RX_DROP_UNUSABLE;
840 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
843 if (unlikely(rx->skb->len < 16)) {
844 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
845 return RX_DROP_MONITOR;
848 /* Drop disallowed frame classes based on STA auth/assoc state;
849 * IEEE 802.11, Chap 5.5.
851 * mac80211 filters only based on association state, i.e. it drops
852 * Class 3 frames from not associated stations. hostapd sends
853 * deauth/disassoc frames when needed. In addition, hostapd is
854 * responsible for filtering on both auth and assoc states.
857 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
858 return ieee80211_rx_mesh_check(rx);
860 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
861 ieee80211_is_pspoll(hdr->frame_control)) &&
862 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
863 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
864 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
866 * accept port control frames from the AP even when it's not
867 * yet marked ASSOC to prevent a race where we don't set the
868 * assoc bit quickly enough before it sends the first frame
870 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
871 ieee80211_is_data_present(hdr->frame_control)) {
875 payload = rx->skb->data +
876 ieee80211_hdrlen(hdr->frame_control);
877 ethertype = (payload[6] << 8) | payload[7];
878 if (cpu_to_be16(ethertype) ==
879 rx->sdata->control_port_protocol)
883 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
884 cfg80211_rx_spurious_frame(rx->sdata->dev,
887 return RX_DROP_UNUSABLE;
889 return RX_DROP_MONITOR;
896 static ieee80211_rx_result debug_noinline
897 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
899 struct sk_buff *skb = rx->skb;
900 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
901 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
904 ieee80211_rx_result result = RX_DROP_UNUSABLE;
905 struct ieee80211_key *sta_ptk = NULL;
906 int mmie_keyidx = -1;
912 * There are four types of keys:
914 * - IGTK (group keys for management frames)
915 * - PTK (pairwise keys)
916 * - STK (station-to-station pairwise keys)
918 * When selecting a key, we have to distinguish between multicast
919 * (including broadcast) and unicast frames, the latter can only
920 * use PTKs and STKs while the former always use GTKs and IGTKs.
921 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
922 * unicast frames can also use key indices like GTKs. Hence, if we
923 * don't have a PTK/STK we check the key index for a WEP key.
925 * Note that in a regular BSS, multicast frames are sent by the
926 * AP only, associated stations unicast the frame to the AP first
927 * which then multicasts it on their behalf.
929 * There is also a slight problem in IBSS mode: GTKs are negotiated
930 * with each station, that is something we don't currently handle.
931 * The spec seems to expect that one negotiates the same key with
932 * every station but there's no such requirement; VLANs could be
937 * No point in finding a key and decrypting if the frame is neither
938 * addressed to us nor a multicast frame.
940 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
943 /* start without a key */
947 sta_ptk = rcu_dereference(rx->sta->ptk);
949 fc = hdr->frame_control;
951 if (!ieee80211_has_protected(fc))
952 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
954 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
956 if ((status->flag & RX_FLAG_DECRYPTED) &&
957 (status->flag & RX_FLAG_IV_STRIPPED))
959 /* Skip decryption if the frame is not protected. */
960 if (!ieee80211_has_protected(fc))
962 } else if (mmie_keyidx >= 0) {
963 /* Broadcast/multicast robust management frame / BIP */
964 if ((status->flag & RX_FLAG_DECRYPTED) &&
965 (status->flag & RX_FLAG_IV_STRIPPED))
968 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
969 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
970 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
972 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
974 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
975 } else if (!ieee80211_has_protected(fc)) {
977 * The frame was not protected, so skip decryption. However, we
978 * need to set rx->key if there is a key that could have been
979 * used so that the frame may be dropped if encryption would
980 * have been expected.
982 struct ieee80211_key *key = NULL;
983 struct ieee80211_sub_if_data *sdata = rx->sdata;
986 if (ieee80211_is_mgmt(fc) &&
987 is_multicast_ether_addr(hdr->addr1) &&
988 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
992 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
993 key = rcu_dereference(rx->sta->gtk[i]);
999 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1000 key = rcu_dereference(sdata->keys[i]);
1012 * The device doesn't give us the IV so we won't be
1013 * able to look up the key. That's ok though, we
1014 * don't need to decrypt the frame, we just won't
1015 * be able to keep statistics accurate.
1016 * Except for key threshold notifications, should
1017 * we somehow allow the driver to tell us which key
1018 * the hardware used if this flag is set?
1020 if ((status->flag & RX_FLAG_DECRYPTED) &&
1021 (status->flag & RX_FLAG_IV_STRIPPED))
1024 hdrlen = ieee80211_hdrlen(fc);
1026 if (rx->skb->len < 8 + hdrlen)
1027 return RX_DROP_UNUSABLE; /* TODO: count this? */
1030 * no need to call ieee80211_wep_get_keyidx,
1031 * it verifies a bunch of things we've done already
1033 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1034 keyidx = keyid >> 6;
1036 /* check per-station GTK first, if multicast packet */
1037 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1038 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1040 /* if not found, try default key */
1042 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1045 * RSNA-protected unicast frames should always be
1046 * sent with pairwise or station-to-station keys,
1047 * but for WEP we allow using a key index as well.
1050 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1051 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1052 !is_multicast_ether_addr(hdr->addr1))
1058 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1059 return RX_DROP_MONITOR;
1061 rx->key->tx_rx_count++;
1062 /* TODO: add threshold stuff again */
1064 return RX_DROP_MONITOR;
1067 switch (rx->key->conf.cipher) {
1068 case WLAN_CIPHER_SUITE_WEP40:
1069 case WLAN_CIPHER_SUITE_WEP104:
1070 result = ieee80211_crypto_wep_decrypt(rx);
1072 case WLAN_CIPHER_SUITE_TKIP:
1073 result = ieee80211_crypto_tkip_decrypt(rx);
1075 case WLAN_CIPHER_SUITE_CCMP:
1076 result = ieee80211_crypto_ccmp_decrypt(rx);
1078 case WLAN_CIPHER_SUITE_AES_CMAC:
1079 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1083 * We can reach here only with HW-only algorithms
1084 * but why didn't it decrypt the frame?!
1086 return RX_DROP_UNUSABLE;
1089 /* the hdr variable is invalid after the decrypt handlers */
1091 /* either the frame has been decrypted or will be dropped */
1092 status->flag |= RX_FLAG_DECRYPTED;
1097 static ieee80211_rx_result debug_noinline
1098 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1100 struct ieee80211_local *local;
1101 struct ieee80211_hdr *hdr;
1102 struct sk_buff *skb;
1106 hdr = (struct ieee80211_hdr *) skb->data;
1108 if (!local->pspolling)
1111 if (!ieee80211_has_fromds(hdr->frame_control))
1112 /* this is not from AP */
1115 if (!ieee80211_is_data(hdr->frame_control))
1118 if (!ieee80211_has_moredata(hdr->frame_control)) {
1119 /* AP has no more frames buffered for us */
1120 local->pspolling = false;
1124 /* more data bit is set, let's request a new frame from the AP */
1125 ieee80211_send_pspoll(local, rx->sdata);
1130 static void ap_sta_ps_start(struct sta_info *sta)
1132 struct ieee80211_sub_if_data *sdata = sta->sdata;
1133 struct ieee80211_local *local = sdata->local;
1135 atomic_inc(&sdata->bss->num_sta_ps);
1136 set_sta_flag(sta, WLAN_STA_PS_STA);
1137 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1138 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1139 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1140 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1141 sdata->name, sta->sta.addr, sta->sta.aid);
1142 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1145 static void ap_sta_ps_end(struct sta_info *sta)
1147 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1148 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1149 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1150 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1152 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1153 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1154 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1155 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1156 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1160 ieee80211_sta_ps_deliver_wakeup(sta);
1163 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1165 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1168 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1170 /* Don't let the same PS state be set twice */
1171 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1172 if ((start && in_ps) || (!start && !in_ps))
1176 ap_sta_ps_start(sta_inf);
1178 ap_sta_ps_end(sta_inf);
1182 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1184 static ieee80211_rx_result debug_noinline
1185 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1187 struct ieee80211_sub_if_data *sdata = rx->sdata;
1188 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1189 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1192 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1195 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1196 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1200 * The device handles station powersave, so don't do anything about
1201 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1202 * it to mac80211 since they're handled.)
1204 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1208 * Don't do anything if the station isn't already asleep. In
1209 * the uAPSD case, the station will probably be marked asleep,
1210 * in the PS-Poll case the station must be confused ...
1212 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1215 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1216 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1217 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1218 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1220 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1223 /* Free PS Poll skb here instead of returning RX_DROP that would
1224 * count as an dropped frame. */
1225 dev_kfree_skb(rx->skb);
1228 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1229 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1230 ieee80211_has_pm(hdr->frame_control) &&
1231 (ieee80211_is_data_qos(hdr->frame_control) ||
1232 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1233 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1234 ac = ieee802_1d_to_ac[tid & 7];
1237 * If this AC is not trigger-enabled do nothing.
1239 * NB: This could/should check a separate bitmap of trigger-
1240 * enabled queues, but for now we only implement uAPSD w/o
1241 * TSPEC changes to the ACs, so they're always the same.
1243 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1246 /* if we are in a service period, do nothing */
1247 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1250 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1251 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1253 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1259 static ieee80211_rx_result debug_noinline
1260 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1262 struct sta_info *sta = rx->sta;
1263 struct sk_buff *skb = rx->skb;
1264 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1265 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1271 * Update last_rx only for IBSS packets which are for the current
1272 * BSSID to avoid keeping the current IBSS network alive in cases
1273 * where other STAs start using different BSSID.
1275 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1276 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1277 NL80211_IFTYPE_ADHOC);
1278 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
1279 sta->last_rx = jiffies;
1280 if (ieee80211_is_data(hdr->frame_control)) {
1281 sta->last_rx_rate_idx = status->rate_idx;
1282 sta->last_rx_rate_flag = status->flag;
1285 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1287 * Mesh beacons will update last_rx when if they are found to
1288 * match the current local configuration when processed.
1290 sta->last_rx = jiffies;
1291 if (ieee80211_is_data(hdr->frame_control)) {
1292 sta->last_rx_rate_idx = status->rate_idx;
1293 sta->last_rx_rate_flag = status->flag;
1297 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1300 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1301 ieee80211_sta_rx_notify(rx->sdata, hdr);
1303 sta->rx_fragments++;
1304 sta->rx_bytes += rx->skb->len;
1305 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1306 sta->last_signal = status->signal;
1307 ewma_add(&sta->avg_signal, -status->signal);
1311 * Change STA power saving mode only at the end of a frame
1312 * exchange sequence.
1314 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1315 !ieee80211_has_morefrags(hdr->frame_control) &&
1316 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1317 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1318 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1319 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1321 * Ignore doze->wake transitions that are
1322 * indicated by non-data frames, the standard
1323 * is unclear here, but for example going to
1324 * PS mode and then scanning would cause a
1325 * doze->wake transition for the probe request,
1326 * and that is clearly undesirable.
1328 if (ieee80211_is_data(hdr->frame_control) &&
1329 !ieee80211_has_pm(hdr->frame_control))
1332 if (ieee80211_has_pm(hdr->frame_control))
1333 ap_sta_ps_start(sta);
1338 * Drop (qos-)data::nullfunc frames silently, since they
1339 * are used only to control station power saving mode.
1341 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1342 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1343 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1346 * If we receive a 4-addr nullfunc frame from a STA
1347 * that was not moved to a 4-addr STA vlan yet send
1348 * the event to userspace and for older hostapd drop
1349 * the frame to the monitor interface.
1351 if (ieee80211_has_a4(hdr->frame_control) &&
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1353 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1354 !rx->sdata->u.vlan.sta))) {
1355 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1356 cfg80211_rx_unexpected_4addr_frame(
1357 rx->sdata->dev, sta->sta.addr,
1359 return RX_DROP_MONITOR;
1362 * Update counter and free packet here to avoid
1363 * counting this as a dropped packed.
1366 dev_kfree_skb(rx->skb);
1371 } /* ieee80211_rx_h_sta_process */
1373 static inline struct ieee80211_fragment_entry *
1374 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1375 unsigned int frag, unsigned int seq, int rx_queue,
1376 struct sk_buff **skb)
1378 struct ieee80211_fragment_entry *entry;
1381 idx = sdata->fragment_next;
1382 entry = &sdata->fragments[sdata->fragment_next++];
1383 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1384 sdata->fragment_next = 0;
1386 if (!skb_queue_empty(&entry->skb_list)) {
1387 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1388 struct ieee80211_hdr *hdr =
1389 (struct ieee80211_hdr *) entry->skb_list.next->data;
1390 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1391 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1392 "addr1=%pM addr2=%pM\n",
1394 jiffies - entry->first_frag_time, entry->seq,
1395 entry->last_frag, hdr->addr1, hdr->addr2);
1397 __skb_queue_purge(&entry->skb_list);
1400 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1402 entry->first_frag_time = jiffies;
1404 entry->rx_queue = rx_queue;
1405 entry->last_frag = frag;
1407 entry->extra_len = 0;
1412 static inline struct ieee80211_fragment_entry *
1413 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1414 unsigned int frag, unsigned int seq,
1415 int rx_queue, struct ieee80211_hdr *hdr)
1417 struct ieee80211_fragment_entry *entry;
1420 idx = sdata->fragment_next;
1421 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1422 struct ieee80211_hdr *f_hdr;
1426 idx = IEEE80211_FRAGMENT_MAX - 1;
1428 entry = &sdata->fragments[idx];
1429 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1430 entry->rx_queue != rx_queue ||
1431 entry->last_frag + 1 != frag)
1434 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1437 * Check ftype and addresses are equal, else check next fragment
1439 if (((hdr->frame_control ^ f_hdr->frame_control) &
1440 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1441 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1442 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1445 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1446 __skb_queue_purge(&entry->skb_list);
1455 static ieee80211_rx_result debug_noinline
1456 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1458 struct ieee80211_hdr *hdr;
1461 unsigned int frag, seq;
1462 struct ieee80211_fragment_entry *entry;
1463 struct sk_buff *skb;
1464 struct ieee80211_rx_status *status;
1466 hdr = (struct ieee80211_hdr *)rx->skb->data;
1467 fc = hdr->frame_control;
1469 if (ieee80211_is_ctl(fc))
1472 sc = le16_to_cpu(hdr->seq_ctrl);
1473 frag = sc & IEEE80211_SCTL_FRAG;
1475 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1476 (rx->skb)->len < 24 ||
1477 is_multicast_ether_addr(hdr->addr1))) {
1478 /* not fragmented */
1481 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1483 if (skb_linearize(rx->skb))
1484 return RX_DROP_UNUSABLE;
1487 * skb_linearize() might change the skb->data and
1488 * previously cached variables (in this case, hdr) need to
1489 * be refreshed with the new data.
1491 hdr = (struct ieee80211_hdr *)rx->skb->data;
1492 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1495 /* This is the first fragment of a new frame. */
1496 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1497 rx->seqno_idx, &(rx->skb));
1498 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1499 ieee80211_has_protected(fc)) {
1500 int queue = rx->security_idx;
1501 /* Store CCMP PN so that we can verify that the next
1502 * fragment has a sequential PN value. */
1504 memcpy(entry->last_pn,
1505 rx->key->u.ccmp.rx_pn[queue],
1511 /* This is a fragment for a frame that should already be pending in
1512 * fragment cache. Add this fragment to the end of the pending entry.
1514 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1515 rx->seqno_idx, hdr);
1517 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1518 return RX_DROP_MONITOR;
1521 /* Verify that MPDUs within one MSDU have sequential PN values.
1522 * (IEEE 802.11i, 8.3.3.4.5) */
1525 u8 pn[CCMP_PN_LEN], *rpn;
1527 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1528 return RX_DROP_UNUSABLE;
1529 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1530 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1535 queue = rx->security_idx;
1536 rpn = rx->key->u.ccmp.rx_pn[queue];
1537 if (memcmp(pn, rpn, CCMP_PN_LEN))
1538 return RX_DROP_UNUSABLE;
1539 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1542 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1543 __skb_queue_tail(&entry->skb_list, rx->skb);
1544 entry->last_frag = frag;
1545 entry->extra_len += rx->skb->len;
1546 if (ieee80211_has_morefrags(fc)) {
1551 rx->skb = __skb_dequeue(&entry->skb_list);
1552 if (skb_tailroom(rx->skb) < entry->extra_len) {
1553 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1554 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1556 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1557 __skb_queue_purge(&entry->skb_list);
1558 return RX_DROP_UNUSABLE;
1561 while ((skb = __skb_dequeue(&entry->skb_list))) {
1562 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1566 /* Complete frame has been reassembled - process it now */
1567 status = IEEE80211_SKB_RXCB(rx->skb);
1568 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1572 rx->sta->rx_packets++;
1573 if (is_multicast_ether_addr(hdr->addr1))
1574 rx->local->dot11MulticastReceivedFrameCount++;
1576 ieee80211_led_rx(rx->local);
1581 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1583 if (unlikely(!rx->sta ||
1584 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1591 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1593 struct sk_buff *skb = rx->skb;
1594 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1597 * Pass through unencrypted frames if the hardware has
1598 * decrypted them already.
1600 if (status->flag & RX_FLAG_DECRYPTED)
1603 /* Drop unencrypted frames if key is set. */
1604 if (unlikely(!ieee80211_has_protected(fc) &&
1605 !ieee80211_is_nullfunc(fc) &&
1606 ieee80211_is_data(fc) &&
1607 (rx->key || rx->sdata->drop_unencrypted)))
1614 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1616 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1617 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1618 __le16 fc = hdr->frame_control;
1621 * Pass through unencrypted frames if the hardware has
1622 * decrypted them already.
1624 if (status->flag & RX_FLAG_DECRYPTED)
1627 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1628 if (unlikely(!ieee80211_has_protected(fc) &&
1629 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1631 if (ieee80211_is_deauth(fc))
1632 cfg80211_send_unprot_deauth(rx->sdata->dev,
1635 else if (ieee80211_is_disassoc(fc))
1636 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1641 /* BIP does not use Protected field, so need to check MMIE */
1642 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1643 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1644 if (ieee80211_is_deauth(fc))
1645 cfg80211_send_unprot_deauth(rx->sdata->dev,
1648 else if (ieee80211_is_disassoc(fc))
1649 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1655 * When using MFP, Action frames are not allowed prior to
1656 * having configured keys.
1658 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1659 ieee80211_is_robust_mgmt_frame(
1660 (struct ieee80211_hdr *) rx->skb->data)))
1668 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1670 struct ieee80211_sub_if_data *sdata = rx->sdata;
1671 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1672 bool check_port_control = false;
1673 struct ethhdr *ehdr;
1676 *port_control = false;
1677 if (ieee80211_has_a4(hdr->frame_control) &&
1678 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1681 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1682 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1684 if (!sdata->u.mgd.use_4addr)
1687 check_port_control = true;
1690 if (is_multicast_ether_addr(hdr->addr1) &&
1691 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1694 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1698 ehdr = (struct ethhdr *) rx->skb->data;
1699 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1700 *port_control = true;
1701 else if (check_port_control)
1708 * requires that rx->skb is a frame with ethernet header
1710 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1712 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1713 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1714 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1717 * Allow EAPOL frames to us/the PAE group address regardless
1718 * of whether the frame was encrypted or not.
1720 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1721 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1722 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1725 if (ieee80211_802_1x_port_control(rx) ||
1726 ieee80211_drop_unencrypted(rx, fc))
1733 * requires that rx->skb is a frame with ethernet header
1736 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1738 struct ieee80211_sub_if_data *sdata = rx->sdata;
1739 struct net_device *dev = sdata->dev;
1740 struct sk_buff *skb, *xmit_skb;
1741 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1742 struct sta_info *dsta;
1743 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1748 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1749 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1750 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1751 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1752 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1753 if (is_multicast_ether_addr(ehdr->h_dest)) {
1755 * send multicast frames both to higher layers in
1756 * local net stack and back to the wireless medium
1758 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1759 if (!xmit_skb && net_ratelimit())
1760 printk(KERN_DEBUG "%s: failed to clone "
1761 "multicast frame\n", dev->name);
1763 dsta = sta_info_get(sdata, skb->data);
1766 * The destination station is associated to
1767 * this AP (in this VLAN), so send the frame
1768 * directly to it and do not pass it to local
1778 int align __maybe_unused;
1780 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1782 * 'align' will only take the values 0 or 2 here
1783 * since all frames are required to be aligned
1784 * to 2-byte boundaries when being passed to
1785 * mac80211. That also explains the __skb_push()
1788 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1790 if (WARN_ON(skb_headroom(skb) < 3)) {
1794 u8 *data = skb->data;
1795 size_t len = skb_headlen(skb);
1797 memmove(skb->data, data, len);
1798 skb_set_tail_pointer(skb, len);
1804 /* deliver to local stack */
1805 skb->protocol = eth_type_trans(skb, dev);
1806 memset(skb->cb, 0, sizeof(skb->cb));
1807 netif_receive_skb(skb);
1813 * Send to wireless media and increase priority by 256 to
1814 * keep the received priority instead of reclassifying
1815 * the frame (see cfg80211_classify8021d).
1817 xmit_skb->priority += 256;
1818 xmit_skb->protocol = htons(ETH_P_802_3);
1819 skb_reset_network_header(xmit_skb);
1820 skb_reset_mac_header(xmit_skb);
1821 dev_queue_xmit(xmit_skb);
1825 static ieee80211_rx_result debug_noinline
1826 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1828 struct net_device *dev = rx->sdata->dev;
1829 struct sk_buff *skb = rx->skb;
1830 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1831 __le16 fc = hdr->frame_control;
1832 struct sk_buff_head frame_list;
1833 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1835 if (unlikely(!ieee80211_is_data(fc)))
1838 if (unlikely(!ieee80211_is_data_present(fc)))
1839 return RX_DROP_MONITOR;
1841 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1844 if (ieee80211_has_a4(hdr->frame_control) &&
1845 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1846 !rx->sdata->u.vlan.sta)
1847 return RX_DROP_UNUSABLE;
1849 if (is_multicast_ether_addr(hdr->addr1) &&
1850 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1851 rx->sdata->u.vlan.sta) ||
1852 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1853 rx->sdata->u.mgd.use_4addr)))
1854 return RX_DROP_UNUSABLE;
1857 __skb_queue_head_init(&frame_list);
1859 if (skb_linearize(skb))
1860 return RX_DROP_UNUSABLE;
1862 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1863 rx->sdata->vif.type,
1864 rx->local->hw.extra_tx_headroom, true);
1866 while (!skb_queue_empty(&frame_list)) {
1867 rx->skb = __skb_dequeue(&frame_list);
1869 if (!ieee80211_frame_allowed(rx, fc)) {
1870 dev_kfree_skb(rx->skb);
1873 dev->stats.rx_packets++;
1874 dev->stats.rx_bytes += rx->skb->len;
1876 ieee80211_deliver_skb(rx);
1882 #ifdef CONFIG_MAC80211_MESH
1883 static ieee80211_rx_result
1884 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1886 struct ieee80211_hdr *fwd_hdr, *hdr;
1887 struct ieee80211_tx_info *info;
1888 struct ieee80211s_hdr *mesh_hdr;
1889 struct sk_buff *skb = rx->skb, *fwd_skb;
1890 struct ieee80211_local *local = rx->local;
1891 struct ieee80211_sub_if_data *sdata = rx->sdata;
1892 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1893 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1894 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1897 hdr = (struct ieee80211_hdr *) skb->data;
1898 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1899 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1901 /* frame is in RMC, don't forward */
1902 if (ieee80211_is_data(hdr->frame_control) &&
1903 is_multicast_ether_addr(hdr->addr1) &&
1904 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1905 return RX_DROP_MONITOR;
1907 if (!ieee80211_is_data(hdr->frame_control) ||
1908 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1912 return RX_DROP_MONITOR;
1914 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1915 struct mesh_path *mppath;
1919 if (is_multicast_ether_addr(hdr->addr1)) {
1920 mpp_addr = hdr->addr3;
1921 proxied_addr = mesh_hdr->eaddr1;
1923 mpp_addr = hdr->addr4;
1924 proxied_addr = mesh_hdr->eaddr2;
1928 mppath = mpp_path_lookup(proxied_addr, sdata);
1930 mpp_path_add(proxied_addr, mpp_addr, sdata);
1932 spin_lock_bh(&mppath->state_lock);
1933 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1934 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1935 spin_unlock_bh(&mppath->state_lock);
1940 /* Frame has reached destination. Don't forward */
1941 if (!is_multicast_ether_addr(hdr->addr1) &&
1942 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1945 q = ieee80211_select_queue_80211(local, skb, hdr);
1946 if (ieee80211_queue_stopped(&local->hw, q)) {
1947 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
1948 return RX_DROP_MONITOR;
1950 skb_set_queue_mapping(skb, q);
1952 if (!--mesh_hdr->ttl) {
1953 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1954 return RX_DROP_MONITOR;
1957 if (!ifmsh->mshcfg.dot11MeshForwarding)
1960 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1962 if (net_ratelimit())
1963 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1968 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1969 info = IEEE80211_SKB_CB(fwd_skb);
1970 memset(info, 0, sizeof(*info));
1971 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1972 info->control.vif = &rx->sdata->vif;
1973 info->control.jiffies = jiffies;
1974 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1975 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1976 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1977 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1978 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1980 /* unable to resolve next hop */
1981 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1982 0, reason, fwd_hdr->addr2, sdata);
1983 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
1985 return RX_DROP_MONITOR;
1988 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1989 ieee80211_add_pending_skb(local, fwd_skb);
1991 if (is_multicast_ether_addr(hdr->addr1) ||
1992 sdata->dev->flags & IFF_PROMISC)
1995 return RX_DROP_MONITOR;
1999 static ieee80211_rx_result debug_noinline
2000 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2002 struct ieee80211_sub_if_data *sdata = rx->sdata;
2003 struct ieee80211_local *local = rx->local;
2004 struct net_device *dev = sdata->dev;
2005 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2006 __le16 fc = hdr->frame_control;
2010 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2013 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2014 return RX_DROP_MONITOR;
2017 * Send unexpected-4addr-frame event to hostapd. For older versions,
2018 * also drop the frame to cooked monitor interfaces.
2020 if (ieee80211_has_a4(hdr->frame_control) &&
2021 sdata->vif.type == NL80211_IFTYPE_AP) {
2023 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2024 cfg80211_rx_unexpected_4addr_frame(
2025 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2026 return RX_DROP_MONITOR;
2029 err = __ieee80211_data_to_8023(rx, &port_control);
2031 return RX_DROP_UNUSABLE;
2033 if (!ieee80211_frame_allowed(rx, fc))
2034 return RX_DROP_MONITOR;
2036 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2037 unlikely(port_control) && sdata->bss) {
2038 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2046 dev->stats.rx_packets++;
2047 dev->stats.rx_bytes += rx->skb->len;
2049 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2050 !is_multicast_ether_addr(
2051 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2052 (!local->scanning &&
2053 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2054 mod_timer(&local->dynamic_ps_timer, jiffies +
2055 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2058 ieee80211_deliver_skb(rx);
2063 static ieee80211_rx_result debug_noinline
2064 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2066 struct ieee80211_local *local = rx->local;
2067 struct ieee80211_hw *hw = &local->hw;
2068 struct sk_buff *skb = rx->skb;
2069 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2070 struct tid_ampdu_rx *tid_agg_rx;
2074 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2077 if (ieee80211_is_back_req(bar->frame_control)) {
2079 __le16 control, start_seq_num;
2080 } __packed bar_data;
2083 return RX_DROP_MONITOR;
2085 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2086 &bar_data, sizeof(bar_data)))
2087 return RX_DROP_MONITOR;
2089 tid = le16_to_cpu(bar_data.control) >> 12;
2091 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2093 return RX_DROP_MONITOR;
2095 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2097 /* reset session timer */
2098 if (tid_agg_rx->timeout)
2099 mod_timer(&tid_agg_rx->session_timer,
2100 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2102 spin_lock(&tid_agg_rx->reorder_lock);
2103 /* release stored frames up to start of BAR */
2104 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2105 spin_unlock(&tid_agg_rx->reorder_lock);
2112 * After this point, we only want management frames,
2113 * so we can drop all remaining control frames to
2114 * cooked monitor interfaces.
2116 return RX_DROP_MONITOR;
2119 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2120 struct ieee80211_mgmt *mgmt,
2123 struct ieee80211_local *local = sdata->local;
2124 struct sk_buff *skb;
2125 struct ieee80211_mgmt *resp;
2127 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2128 /* Not to own unicast address */
2132 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2133 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2134 /* Not from the current AP or not associated yet. */
2138 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2139 /* Too short SA Query request frame */
2143 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2147 skb_reserve(skb, local->hw.extra_tx_headroom);
2148 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2149 memset(resp, 0, 24);
2150 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2151 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2152 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2153 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2154 IEEE80211_STYPE_ACTION);
2155 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2156 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2157 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2158 memcpy(resp->u.action.u.sa_query.trans_id,
2159 mgmt->u.action.u.sa_query.trans_id,
2160 WLAN_SA_QUERY_TR_ID_LEN);
2162 ieee80211_tx_skb(sdata, skb);
2165 static ieee80211_rx_result debug_noinline
2166 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2168 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2169 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2172 * From here on, look only at management frames.
2173 * Data and control frames are already handled,
2174 * and unknown (reserved) frames are useless.
2176 if (rx->skb->len < 24)
2177 return RX_DROP_MONITOR;
2179 if (!ieee80211_is_mgmt(mgmt->frame_control))
2180 return RX_DROP_MONITOR;
2182 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2183 ieee80211_is_beacon(mgmt->frame_control) &&
2184 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2187 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2188 sig = status->signal;
2190 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2191 rx->skb->data, rx->skb->len,
2192 status->freq, sig, GFP_ATOMIC);
2193 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2196 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2197 return RX_DROP_MONITOR;
2199 if (ieee80211_drop_unencrypted_mgmt(rx))
2200 return RX_DROP_UNUSABLE;
2205 static ieee80211_rx_result debug_noinline
2206 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2208 struct ieee80211_local *local = rx->local;
2209 struct ieee80211_sub_if_data *sdata = rx->sdata;
2210 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2211 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2212 int len = rx->skb->len;
2214 if (!ieee80211_is_action(mgmt->frame_control))
2217 /* drop too small frames */
2218 if (len < IEEE80211_MIN_ACTION_SIZE)
2219 return RX_DROP_UNUSABLE;
2221 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2222 return RX_DROP_UNUSABLE;
2224 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2225 return RX_DROP_UNUSABLE;
2227 switch (mgmt->u.action.category) {
2228 case WLAN_CATEGORY_HT:
2229 /* reject HT action frames from stations not supporting HT */
2230 if (!rx->sta->sta.ht_cap.ht_supported)
2233 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2234 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2235 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2236 sdata->vif.type != NL80211_IFTYPE_AP &&
2237 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2240 /* verify action & smps_control are present */
2241 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2244 switch (mgmt->u.action.u.ht_smps.action) {
2245 case WLAN_HT_ACTION_SMPS: {
2246 struct ieee80211_supported_band *sband;
2249 /* convert to HT capability */
2250 switch (mgmt->u.action.u.ht_smps.smps_control) {
2251 case WLAN_HT_SMPS_CONTROL_DISABLED:
2252 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2254 case WLAN_HT_SMPS_CONTROL_STATIC:
2255 smps = WLAN_HT_CAP_SM_PS_STATIC;
2257 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2258 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2263 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2265 /* if no change do nothing */
2266 if ((rx->sta->sta.ht_cap.cap &
2267 IEEE80211_HT_CAP_SM_PS) == smps)
2270 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2271 rx->sta->sta.ht_cap.cap |= smps;
2273 sband = rx->local->hw.wiphy->bands[status->band];
2275 rate_control_rate_update(
2276 local, sband, rx->sta,
2277 IEEE80211_RC_SMPS_CHANGED,
2278 ieee80211_get_tx_channel_type(
2279 local, local->_oper_channel_type));
2287 case WLAN_CATEGORY_BACK:
2288 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2289 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2290 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2291 sdata->vif.type != NL80211_IFTYPE_AP &&
2292 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2295 /* verify action_code is present */
2296 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2299 switch (mgmt->u.action.u.addba_req.action_code) {
2300 case WLAN_ACTION_ADDBA_REQ:
2301 if (len < (IEEE80211_MIN_ACTION_SIZE +
2302 sizeof(mgmt->u.action.u.addba_req)))
2305 case WLAN_ACTION_ADDBA_RESP:
2306 if (len < (IEEE80211_MIN_ACTION_SIZE +
2307 sizeof(mgmt->u.action.u.addba_resp)))
2310 case WLAN_ACTION_DELBA:
2311 if (len < (IEEE80211_MIN_ACTION_SIZE +
2312 sizeof(mgmt->u.action.u.delba)))
2320 case WLAN_CATEGORY_SPECTRUM_MGMT:
2321 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2324 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2327 /* verify action_code is present */
2328 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2331 switch (mgmt->u.action.u.measurement.action_code) {
2332 case WLAN_ACTION_SPCT_MSR_REQ:
2333 if (len < (IEEE80211_MIN_ACTION_SIZE +
2334 sizeof(mgmt->u.action.u.measurement)))
2336 ieee80211_process_measurement_req(sdata, mgmt, len);
2338 case WLAN_ACTION_SPCT_CHL_SWITCH:
2339 if (len < (IEEE80211_MIN_ACTION_SIZE +
2340 sizeof(mgmt->u.action.u.chan_switch)))
2343 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2346 if (compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid))
2352 case WLAN_CATEGORY_SA_QUERY:
2353 if (len < (IEEE80211_MIN_ACTION_SIZE +
2354 sizeof(mgmt->u.action.u.sa_query)))
2357 switch (mgmt->u.action.u.sa_query.action) {
2358 case WLAN_ACTION_SA_QUERY_REQUEST:
2359 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2361 ieee80211_process_sa_query_req(sdata, mgmt, len);
2365 case WLAN_CATEGORY_SELF_PROTECTED:
2366 switch (mgmt->u.action.u.self_prot.action_code) {
2367 case WLAN_SP_MESH_PEERING_OPEN:
2368 case WLAN_SP_MESH_PEERING_CLOSE:
2369 case WLAN_SP_MESH_PEERING_CONFIRM:
2370 if (!ieee80211_vif_is_mesh(&sdata->vif))
2372 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2373 /* userspace handles this frame */
2376 case WLAN_SP_MGK_INFORM:
2377 case WLAN_SP_MGK_ACK:
2378 if (!ieee80211_vif_is_mesh(&sdata->vif))
2383 case WLAN_CATEGORY_MESH_ACTION:
2384 if (!ieee80211_vif_is_mesh(&sdata->vif))
2386 if (mesh_action_is_path_sel(mgmt) &&
2387 (!mesh_path_sel_is_hwmp(sdata)))
2395 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2396 /* will return in the next handlers */
2401 rx->sta->rx_packets++;
2402 dev_kfree_skb(rx->skb);
2406 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2407 skb_queue_tail(&sdata->skb_queue, rx->skb);
2408 ieee80211_queue_work(&local->hw, &sdata->work);
2410 rx->sta->rx_packets++;
2414 static ieee80211_rx_result debug_noinline
2415 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2417 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2420 /* skip known-bad action frames and return them in the next handler */
2421 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2425 * Getting here means the kernel doesn't know how to handle
2426 * it, but maybe userspace does ... include returned frames
2427 * so userspace can register for those to know whether ones
2428 * it transmitted were processed or returned.
2431 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2432 sig = status->signal;
2434 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, sig,
2435 rx->skb->data, rx->skb->len,
2438 rx->sta->rx_packets++;
2439 dev_kfree_skb(rx->skb);
2447 static ieee80211_rx_result debug_noinline
2448 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2450 struct ieee80211_local *local = rx->local;
2451 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2452 struct sk_buff *nskb;
2453 struct ieee80211_sub_if_data *sdata = rx->sdata;
2454 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2456 if (!ieee80211_is_action(mgmt->frame_control))
2460 * For AP mode, hostapd is responsible for handling any action
2461 * frames that we didn't handle, including returning unknown
2462 * ones. For all other modes we will return them to the sender,
2463 * setting the 0x80 bit in the action category, as required by
2464 * 802.11-2012 9.24.4.
2465 * Newer versions of hostapd shall also use the management frame
2466 * registration mechanisms, but older ones still use cooked
2467 * monitor interfaces so push all frames there.
2469 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2470 (sdata->vif.type == NL80211_IFTYPE_AP ||
2471 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2472 return RX_DROP_MONITOR;
2474 if (is_multicast_ether_addr(mgmt->da))
2475 return RX_DROP_MONITOR;
2477 /* do not return rejected action frames */
2478 if (mgmt->u.action.category & 0x80)
2479 return RX_DROP_UNUSABLE;
2481 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2484 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2486 nmgmt->u.action.category |= 0x80;
2487 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2488 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2490 memset(nskb->cb, 0, sizeof(nskb->cb));
2492 ieee80211_tx_skb(rx->sdata, nskb);
2494 dev_kfree_skb(rx->skb);
2498 static ieee80211_rx_result debug_noinline
2499 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2501 struct ieee80211_sub_if_data *sdata = rx->sdata;
2502 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2505 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2507 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2508 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2509 sdata->vif.type != NL80211_IFTYPE_STATION)
2510 return RX_DROP_MONITOR;
2513 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2514 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2515 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2516 /* process for all: mesh, mlme, ibss */
2518 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2519 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2520 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2521 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2522 if (is_multicast_ether_addr(mgmt->da) &&
2523 !is_broadcast_ether_addr(mgmt->da))
2524 return RX_DROP_MONITOR;
2526 /* process only for station */
2527 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2528 return RX_DROP_MONITOR;
2530 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2531 /* process only for ibss */
2532 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2533 return RX_DROP_MONITOR;
2536 return RX_DROP_MONITOR;
2539 /* queue up frame and kick off work to process it */
2540 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2541 skb_queue_tail(&sdata->skb_queue, rx->skb);
2542 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2544 rx->sta->rx_packets++;
2549 /* TODO: use IEEE80211_RX_FRAGMENTED */
2550 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2551 struct ieee80211_rate *rate)
2553 struct ieee80211_sub_if_data *sdata;
2554 struct ieee80211_local *local = rx->local;
2555 struct sk_buff *skb = rx->skb, *skb2;
2556 struct net_device *prev_dev = NULL;
2557 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2558 int needed_headroom;
2561 * If cooked monitor has been processed already, then
2562 * don't do it again. If not, set the flag.
2564 if (rx->flags & IEEE80211_RX_CMNTR)
2566 rx->flags |= IEEE80211_RX_CMNTR;
2568 /* If there are no cooked monitor interfaces, just free the SKB */
2569 if (!local->cooked_mntrs)
2572 /* room for the radiotap header based on driver features */
2573 needed_headroom = ieee80211_rx_radiotap_len(local, status);
2575 if (skb_headroom(skb) < needed_headroom &&
2576 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2579 /* prepend radiotap information */
2580 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2583 skb_set_mac_header(skb, 0);
2584 skb->ip_summed = CHECKSUM_UNNECESSARY;
2585 skb->pkt_type = PACKET_OTHERHOST;
2586 skb->protocol = htons(ETH_P_802_2);
2588 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2589 if (!ieee80211_sdata_running(sdata))
2592 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2593 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2597 skb2 = skb_clone(skb, GFP_ATOMIC);
2599 skb2->dev = prev_dev;
2600 netif_receive_skb(skb2);
2604 prev_dev = sdata->dev;
2605 sdata->dev->stats.rx_packets++;
2606 sdata->dev->stats.rx_bytes += skb->len;
2610 skb->dev = prev_dev;
2611 netif_receive_skb(skb);
2619 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2620 ieee80211_rx_result res)
2623 case RX_DROP_MONITOR:
2624 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2626 rx->sta->rx_dropped++;
2629 struct ieee80211_rate *rate = NULL;
2630 struct ieee80211_supported_band *sband;
2631 struct ieee80211_rx_status *status;
2633 status = IEEE80211_SKB_RXCB((rx->skb));
2635 sband = rx->local->hw.wiphy->bands[status->band];
2636 if (!(status->flag & RX_FLAG_HT))
2637 rate = &sband->bitrates[status->rate_idx];
2639 ieee80211_rx_cooked_monitor(rx, rate);
2642 case RX_DROP_UNUSABLE:
2643 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2645 rx->sta->rx_dropped++;
2646 dev_kfree_skb(rx->skb);
2649 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2654 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2656 ieee80211_rx_result res = RX_DROP_MONITOR;
2657 struct sk_buff *skb;
2659 #define CALL_RXH(rxh) \
2662 if (res != RX_CONTINUE) \
2666 spin_lock(&rx->local->rx_skb_queue.lock);
2667 if (rx->local->running_rx_handler)
2670 rx->local->running_rx_handler = true;
2672 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2673 spin_unlock(&rx->local->rx_skb_queue.lock);
2676 * all the other fields are valid across frames
2677 * that belong to an aMPDU since they are on the
2678 * same TID from the same station
2682 CALL_RXH(ieee80211_rx_h_decrypt)
2683 CALL_RXH(ieee80211_rx_h_check_more_data)
2684 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2685 CALL_RXH(ieee80211_rx_h_sta_process)
2686 CALL_RXH(ieee80211_rx_h_defragment)
2687 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2688 /* must be after MMIC verify so header is counted in MPDU mic */
2689 #ifdef CONFIG_MAC80211_MESH
2690 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2691 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2693 CALL_RXH(ieee80211_rx_h_amsdu)
2694 CALL_RXH(ieee80211_rx_h_data)
2695 CALL_RXH(ieee80211_rx_h_ctrl);
2696 CALL_RXH(ieee80211_rx_h_mgmt_check)
2697 CALL_RXH(ieee80211_rx_h_action)
2698 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2699 CALL_RXH(ieee80211_rx_h_action_return)
2700 CALL_RXH(ieee80211_rx_h_mgmt)
2703 ieee80211_rx_handlers_result(rx, res);
2704 spin_lock(&rx->local->rx_skb_queue.lock);
2708 rx->local->running_rx_handler = false;
2711 spin_unlock(&rx->local->rx_skb_queue.lock);
2714 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2716 ieee80211_rx_result res = RX_DROP_MONITOR;
2718 #define CALL_RXH(rxh) \
2721 if (res != RX_CONTINUE) \
2725 CALL_RXH(ieee80211_rx_h_passive_scan)
2726 CALL_RXH(ieee80211_rx_h_check)
2728 ieee80211_rx_reorder_ampdu(rx);
2730 ieee80211_rx_handlers(rx);
2734 ieee80211_rx_handlers_result(rx, res);
2740 * This function makes calls into the RX path, therefore
2741 * it has to be invoked under RCU read lock.
2743 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2745 struct ieee80211_rx_data rx = {
2747 .sdata = sta->sdata,
2748 .local = sta->local,
2749 /* This is OK -- must be QoS data frame */
2750 .security_idx = tid,
2754 struct tid_ampdu_rx *tid_agg_rx;
2756 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2760 spin_lock(&tid_agg_rx->reorder_lock);
2761 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2762 spin_unlock(&tid_agg_rx->reorder_lock);
2764 ieee80211_rx_handlers(&rx);
2767 /* main receive path */
2769 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2770 struct ieee80211_hdr *hdr)
2772 struct ieee80211_sub_if_data *sdata = rx->sdata;
2773 struct sk_buff *skb = rx->skb;
2774 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2775 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2776 int multicast = is_multicast_ether_addr(hdr->addr1);
2778 switch (sdata->vif.type) {
2779 case NL80211_IFTYPE_STATION:
2780 if (!bssid && !sdata->u.mgd.use_4addr)
2783 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2784 if (!(sdata->dev->flags & IFF_PROMISC) ||
2785 sdata->u.mgd.use_4addr)
2787 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2790 case NL80211_IFTYPE_ADHOC:
2793 if (ieee80211_is_beacon(hdr->frame_control)) {
2796 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2797 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2799 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2800 } else if (!multicast &&
2801 compare_ether_addr(sdata->vif.addr,
2803 if (!(sdata->dev->flags & IFF_PROMISC))
2805 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2806 } else if (!rx->sta) {
2808 if (status->flag & RX_FLAG_HT)
2809 rate_idx = 0; /* TODO: HT rates */
2811 rate_idx = status->rate_idx;
2812 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2816 case NL80211_IFTYPE_MESH_POINT:
2818 compare_ether_addr(sdata->vif.addr,
2820 if (!(sdata->dev->flags & IFF_PROMISC))
2823 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2826 case NL80211_IFTYPE_AP_VLAN:
2827 case NL80211_IFTYPE_AP:
2829 if (compare_ether_addr(sdata->vif.addr,
2832 } else if (!ieee80211_bssid_match(bssid,
2835 * Accept public action frames even when the
2836 * BSSID doesn't match, this is used for P2P
2837 * and location updates. Note that mac80211
2838 * itself never looks at these frames.
2840 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2841 ieee80211_is_public_action(hdr, skb->len))
2843 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2844 !ieee80211_is_beacon(hdr->frame_control))
2846 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2849 case NL80211_IFTYPE_WDS:
2850 if (bssid || !ieee80211_is_data(hdr->frame_control))
2852 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2856 /* should never get here */
2865 * This function returns whether or not the SKB
2866 * was destined for RX processing or not, which,
2867 * if consume is true, is equivalent to whether
2868 * or not the skb was consumed.
2870 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2871 struct sk_buff *skb, bool consume)
2873 struct ieee80211_local *local = rx->local;
2874 struct ieee80211_sub_if_data *sdata = rx->sdata;
2875 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2876 struct ieee80211_hdr *hdr = (void *)skb->data;
2880 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2881 prepares = prepare_for_handlers(rx, hdr);
2887 skb = skb_copy(skb, GFP_ATOMIC);
2889 if (net_ratelimit())
2890 wiphy_debug(local->hw.wiphy,
2891 "failed to copy skb for %s\n",
2899 ieee80211_invoke_rx_handlers(rx);
2904 * This is the actual Rx frames handler. as it blongs to Rx path it must
2905 * be called with rcu_read_lock protection.
2907 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2908 struct sk_buff *skb)
2910 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2911 struct ieee80211_local *local = hw_to_local(hw);
2912 struct ieee80211_sub_if_data *sdata;
2913 struct ieee80211_hdr *hdr;
2915 struct ieee80211_rx_data rx;
2916 struct ieee80211_sub_if_data *prev;
2917 struct sta_info *sta, *tmp, *prev_sta;
2920 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2921 memset(&rx, 0, sizeof(rx));
2925 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2926 local->dot11ReceivedFragmentCount++;
2928 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2929 test_bit(SCAN_SW_SCANNING, &local->scanning)))
2930 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2932 if (ieee80211_is_mgmt(fc))
2933 err = skb_linearize(skb);
2935 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2942 hdr = (struct ieee80211_hdr *)skb->data;
2943 ieee80211_parse_qos(&rx);
2944 ieee80211_verify_alignment(&rx);
2946 if (ieee80211_is_data(fc)) {
2949 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2956 rx.sdata = prev_sta->sdata;
2957 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2964 rx.sdata = prev_sta->sdata;
2966 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2974 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2975 if (!ieee80211_sdata_running(sdata))
2978 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2979 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2983 * frame is destined for this interface, but if it's
2984 * not also for the previous one we handle that after
2985 * the loop to avoid copying the SKB once too much
2993 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2995 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3001 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3004 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3013 * This is the receive path handler. It is called by a low level driver when an
3014 * 802.11 MPDU is received from the hardware.
3016 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3018 struct ieee80211_local *local = hw_to_local(hw);
3019 struct ieee80211_rate *rate = NULL;
3020 struct ieee80211_supported_band *sband;
3021 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3023 WARN_ON_ONCE(softirq_count() == 0);
3025 if (WARN_ON(status->band < 0 ||
3026 status->band >= IEEE80211_NUM_BANDS))
3029 sband = local->hw.wiphy->bands[status->band];
3030 if (WARN_ON(!sband))
3034 * If we're suspending, it is possible although not too likely
3035 * that we'd be receiving frames after having already partially
3036 * quiesced the stack. We can't process such frames then since
3037 * that might, for example, cause stations to be added or other
3038 * driver callbacks be invoked.
3040 if (unlikely(local->quiescing || local->suspended))
3044 * The same happens when we're not even started,
3045 * but that's worth a warning.
3047 if (WARN_ON(!local->started))
3050 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3052 * Validate the rate, unless a PLCP error means that
3053 * we probably can't have a valid rate here anyway.
3056 if (status->flag & RX_FLAG_HT) {
3058 * rate_idx is MCS index, which can be [0-76]
3061 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3063 * Anything else would be some sort of driver or
3064 * hardware error. The driver should catch hardware
3067 if (WARN((status->rate_idx < 0 ||
3068 status->rate_idx > 76),
3069 "Rate marked as an HT rate but passed "
3070 "status->rate_idx is not "
3071 "an MCS index [0-76]: %d (0x%02x)\n",
3076 if (WARN_ON(status->rate_idx < 0 ||
3077 status->rate_idx >= sband->n_bitrates))
3079 rate = &sband->bitrates[status->rate_idx];
3083 status->rx_flags = 0;
3086 * key references and virtual interfaces are protected using RCU
3087 * and this requires that we are in a read-side RCU section during
3088 * receive processing
3093 * Frames with failed FCS/PLCP checksum are not returned,
3094 * all other frames are returned without radiotap header
3095 * if it was previously present.
3096 * Also, frames with less than 16 bytes are dropped.
3098 skb = ieee80211_rx_monitor(local, skb, rate);
3104 ieee80211_tpt_led_trig_rx(local,
3105 ((struct ieee80211_hdr *)skb->data)->frame_control,
3107 __ieee80211_rx_handle_packet(hw, skb);
3115 EXPORT_SYMBOL(ieee80211_rx);
3117 /* This is a version of the rx handler that can be called from hard irq
3118 * context. Post the skb on the queue and schedule the tasklet */
3119 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3121 struct ieee80211_local *local = hw_to_local(hw);
3123 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3125 skb->pkt_type = IEEE80211_RX_MSG;
3126 skb_queue_tail(&local->skb_queue, skb);
3127 tasklet_schedule(&local->tasklet);
3129 EXPORT_SYMBOL(ieee80211_rx_irqsafe);