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, int present_fcs_len)
59 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
60 struct ieee80211_hdr *hdr;
62 hdr = (void *)(skb->data);
64 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
65 RX_FLAG_FAILED_PLCP_CRC |
66 RX_FLAG_AMPDU_IS_ZEROLEN))
68 if (unlikely(skb->len < 16 + present_fcs_len))
70 if (ieee80211_is_ctl(hdr->frame_control) &&
71 !ieee80211_is_pspoll(hdr->frame_control) &&
72 !ieee80211_is_back_req(hdr->frame_control))
78 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
79 struct ieee80211_rx_status *status)
83 /* always present fields */
84 len = sizeof(struct ieee80211_radiotap_header) + 8;
86 /* allocate extra bitmaps */
88 len += 4 * hweight8(status->chains);
90 if (ieee80211_have_rx_timestamp(status)) {
94 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
97 /* antenna field, if we don't have per-chain info */
101 /* padding for RX_FLAGS if necessary */
104 if (status->flag & RX_FLAG_HT) /* HT info */
107 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
112 if (status->flag & RX_FLAG_VHT) {
117 if (status->chains) {
118 /* antenna and antenna signal fields */
119 len += 2 * hweight8(status->chains);
126 * ieee80211_add_rx_radiotap_header - add radiotap header
128 * add a radiotap header containing all the fields which the hardware provided.
131 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
133 struct ieee80211_rate *rate,
134 int rtap_len, bool has_fcs)
136 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
137 struct ieee80211_radiotap_header *rthdr;
142 u16 channel_flags = 0;
144 unsigned long chains = status->chains;
147 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
150 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
151 memset(rthdr, 0, rtap_len);
152 it_present = &rthdr->it_present;
154 /* radiotap header, set always present flags */
155 rthdr->it_len = cpu_to_le16(rtap_len);
156 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
157 BIT(IEEE80211_RADIOTAP_CHANNEL) |
158 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
161 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
163 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
165 BIT(IEEE80211_RADIOTAP_EXT) |
166 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
167 put_unaligned_le32(it_present_val, it_present);
169 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
170 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
173 put_unaligned_le32(it_present_val, it_present);
175 pos = (void *)(it_present + 1);
177 /* the order of the following fields is important */
179 /* IEEE80211_RADIOTAP_TSFT */
180 if (ieee80211_have_rx_timestamp(status)) {
182 while ((pos - (u8 *)rthdr) & 7)
185 ieee80211_calculate_rx_timestamp(local, status,
188 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
192 /* IEEE80211_RADIOTAP_FLAGS */
193 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
194 *pos |= IEEE80211_RADIOTAP_F_FCS;
195 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
196 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
197 if (status->flag & RX_FLAG_SHORTPRE)
198 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
201 /* IEEE80211_RADIOTAP_RATE */
202 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
204 * Without rate information don't add it. If we have,
205 * MCS information is a separate field in radiotap,
206 * added below. The byte here is needed as padding
207 * for the channel though, so initialise it to 0.
212 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
213 if (status->flag & RX_FLAG_10MHZ)
215 else if (status->flag & RX_FLAG_5MHZ)
217 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
221 /* IEEE80211_RADIOTAP_CHANNEL */
222 put_unaligned_le16(status->freq, pos);
224 if (status->flag & RX_FLAG_10MHZ)
225 channel_flags |= IEEE80211_CHAN_HALF;
226 else if (status->flag & RX_FLAG_5MHZ)
227 channel_flags |= IEEE80211_CHAN_QUARTER;
229 if (status->band == IEEE80211_BAND_5GHZ)
230 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
231 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
232 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
233 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
234 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
236 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
238 channel_flags |= IEEE80211_CHAN_2GHZ;
239 put_unaligned_le16(channel_flags, pos);
242 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
243 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
244 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
245 *pos = status->signal;
247 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
251 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
253 if (!status->chains) {
254 /* IEEE80211_RADIOTAP_ANTENNA */
255 *pos = status->antenna;
259 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
261 /* IEEE80211_RADIOTAP_RX_FLAGS */
262 /* ensure 2 byte alignment for the 2 byte field as required */
263 if ((pos - (u8 *)rthdr) & 1)
265 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
266 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
267 put_unaligned_le16(rx_flags, pos);
270 if (status->flag & RX_FLAG_HT) {
273 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
274 *pos++ = local->hw.radiotap_mcs_details;
276 if (status->flag & RX_FLAG_SHORT_GI)
277 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
278 if (status->flag & RX_FLAG_40MHZ)
279 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
280 if (status->flag & RX_FLAG_HT_GF)
281 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
282 if (status->flag & RX_FLAG_LDPC)
283 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
284 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
285 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
287 *pos++ = status->rate_idx;
290 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
293 /* ensure 4 byte alignment */
294 while ((pos - (u8 *)rthdr) & 3)
297 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
298 put_unaligned_le32(status->ampdu_reference, pos);
300 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
301 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
302 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
303 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
304 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
305 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
306 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
307 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
308 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
309 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
310 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
311 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
312 put_unaligned_le16(flags, pos);
314 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
315 *pos++ = status->ampdu_delimiter_crc;
321 if (status->flag & RX_FLAG_VHT) {
322 u16 known = local->hw.radiotap_vht_details;
324 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
325 /* known field - how to handle 80+80? */
326 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
327 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
328 put_unaligned_le16(known, pos);
331 if (status->flag & RX_FLAG_SHORT_GI)
332 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
333 /* in VHT, STBC is binary */
334 if (status->flag & RX_FLAG_STBC_MASK)
335 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
336 if (status->vht_flag & RX_VHT_FLAG_BF)
337 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
340 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
342 else if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
343 *pos++ = 0; /* marked not known above */
344 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
346 else if (status->flag & RX_FLAG_40MHZ)
351 *pos = (status->rate_idx << 4) | status->vht_nss;
354 if (status->flag & RX_FLAG_LDPC)
355 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
363 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
364 *pos++ = status->chain_signal[chain];
370 * This function copies a received frame to all monitor interfaces and
371 * returns a cleaned-up SKB that no longer includes the FCS nor the
372 * radiotap header the driver might have added.
374 static struct sk_buff *
375 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
376 struct ieee80211_rate *rate)
378 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
379 struct ieee80211_sub_if_data *sdata;
381 struct sk_buff *skb, *skb2;
382 struct net_device *prev_dev = NULL;
383 int present_fcs_len = 0;
386 * First, we may need to make a copy of the skb because
387 * (1) we need to modify it for radiotap (if not present), and
388 * (2) the other RX handlers will modify the skb we got.
390 * We don't need to, of course, if we aren't going to return
391 * the SKB because it has a bad FCS/PLCP checksum.
394 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
395 present_fcs_len = FCS_LEN;
397 /* ensure hdr->frame_control is in skb head */
398 if (!pskb_may_pull(origskb, 2)) {
399 dev_kfree_skb(origskb);
403 if (!local->monitors) {
404 if (should_drop_frame(origskb, present_fcs_len)) {
405 dev_kfree_skb(origskb);
409 return remove_monitor_info(local, origskb);
412 /* room for the radiotap header based on driver features */
413 needed_headroom = ieee80211_rx_radiotap_space(local, status);
415 if (should_drop_frame(origskb, present_fcs_len)) {
416 /* only need to expand headroom if necessary */
421 * This shouldn't trigger often because most devices have an
422 * RX header they pull before we get here, and that should
423 * be big enough for our radiotap information. We should
424 * probably export the length to drivers so that we can have
425 * them allocate enough headroom to start with.
427 if (skb_headroom(skb) < needed_headroom &&
428 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
434 * Need to make a copy and possibly remove radiotap header
435 * and FCS from the original.
437 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
439 origskb = remove_monitor_info(local, origskb);
445 /* prepend radiotap information */
446 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
449 skb_reset_mac_header(skb);
450 skb->ip_summed = CHECKSUM_UNNECESSARY;
451 skb->pkt_type = PACKET_OTHERHOST;
452 skb->protocol = htons(ETH_P_802_2);
454 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
455 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
458 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
461 if (!ieee80211_sdata_running(sdata))
465 skb2 = skb_clone(skb, GFP_ATOMIC);
467 skb2->dev = prev_dev;
468 netif_receive_skb(skb2);
472 prev_dev = sdata->dev;
473 sdata->dev->stats.rx_packets++;
474 sdata->dev->stats.rx_bytes += skb->len;
479 netif_receive_skb(skb);
486 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
488 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
489 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
490 int tid, seqno_idx, security_idx;
492 /* does the frame have a qos control field? */
493 if (ieee80211_is_data_qos(hdr->frame_control)) {
494 u8 *qc = ieee80211_get_qos_ctl(hdr);
495 /* frame has qos control */
496 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
497 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
498 status->rx_flags |= IEEE80211_RX_AMSDU;
504 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
506 * Sequence numbers for management frames, QoS data
507 * frames with a broadcast/multicast address in the
508 * Address 1 field, and all non-QoS data frames sent
509 * by QoS STAs are assigned using an additional single
510 * modulo-4096 counter, [...]
512 * We also use that counter for non-QoS STAs.
514 seqno_idx = IEEE80211_NUM_TIDS;
516 if (ieee80211_is_mgmt(hdr->frame_control))
517 security_idx = IEEE80211_NUM_TIDS;
521 rx->seqno_idx = seqno_idx;
522 rx->security_idx = security_idx;
523 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
524 * For now, set skb->priority to 0 for other cases. */
525 rx->skb->priority = (tid > 7) ? 0 : tid;
529 * DOC: Packet alignment
531 * Drivers always need to pass packets that are aligned to two-byte boundaries
534 * Additionally, should, if possible, align the payload data in a way that
535 * guarantees that the contained IP header is aligned to a four-byte
536 * boundary. In the case of regular frames, this simply means aligning the
537 * payload to a four-byte boundary (because either the IP header is directly
538 * contained, or IV/RFC1042 headers that have a length divisible by four are
539 * in front of it). If the payload data is not properly aligned and the
540 * architecture doesn't support efficient unaligned operations, mac80211
541 * will align the data.
543 * With A-MSDU frames, however, the payload data address must yield two modulo
544 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
545 * push the IP header further back to a multiple of four again. Thankfully, the
546 * specs were sane enough this time around to require padding each A-MSDU
547 * subframe to a length that is a multiple of four.
549 * Padding like Atheros hardware adds which is between the 802.11 header and
550 * the payload is not supported, the driver is required to move the 802.11
551 * header to be directly in front of the payload in that case.
553 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
555 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
556 WARN_ONCE((unsigned long)rx->skb->data & 1,
557 "unaligned packet at 0x%p\n", rx->skb->data);
564 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
566 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
568 if (is_multicast_ether_addr(hdr->addr1))
571 return ieee80211_is_robust_mgmt_frame(skb);
575 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
577 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
579 if (!is_multicast_ether_addr(hdr->addr1))
582 return ieee80211_is_robust_mgmt_frame(skb);
586 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
587 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
589 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
590 struct ieee80211_mmie *mmie;
592 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
595 if (!ieee80211_is_robust_mgmt_frame(skb))
596 return -1; /* not a robust management frame */
598 mmie = (struct ieee80211_mmie *)
599 (skb->data + skb->len - sizeof(*mmie));
600 if (mmie->element_id != WLAN_EID_MMIE ||
601 mmie->length != sizeof(*mmie) - 2)
604 return le16_to_cpu(mmie->key_id);
607 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
610 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
615 fc = hdr->frame_control;
616 hdrlen = ieee80211_hdrlen(fc);
618 if (skb->len < hdrlen + cs->hdr_len)
621 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
622 keyid &= cs->key_idx_mask;
623 keyid >>= cs->key_idx_shift;
628 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
630 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
631 char *dev_addr = rx->sdata->vif.addr;
633 if (ieee80211_is_data(hdr->frame_control)) {
634 if (is_multicast_ether_addr(hdr->addr1)) {
635 if (ieee80211_has_tods(hdr->frame_control) ||
636 !ieee80211_has_fromds(hdr->frame_control))
637 return RX_DROP_MONITOR;
638 if (ether_addr_equal(hdr->addr3, dev_addr))
639 return RX_DROP_MONITOR;
641 if (!ieee80211_has_a4(hdr->frame_control))
642 return RX_DROP_MONITOR;
643 if (ether_addr_equal(hdr->addr4, dev_addr))
644 return RX_DROP_MONITOR;
648 /* If there is not an established peer link and this is not a peer link
649 * establisment frame, beacon or probe, drop the frame.
652 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
653 struct ieee80211_mgmt *mgmt;
655 if (!ieee80211_is_mgmt(hdr->frame_control))
656 return RX_DROP_MONITOR;
658 if (ieee80211_is_action(hdr->frame_control)) {
661 /* make sure category field is present */
662 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
663 return RX_DROP_MONITOR;
665 mgmt = (struct ieee80211_mgmt *)hdr;
666 category = mgmt->u.action.category;
667 if (category != WLAN_CATEGORY_MESH_ACTION &&
668 category != WLAN_CATEGORY_SELF_PROTECTED)
669 return RX_DROP_MONITOR;
673 if (ieee80211_is_probe_req(hdr->frame_control) ||
674 ieee80211_is_probe_resp(hdr->frame_control) ||
675 ieee80211_is_beacon(hdr->frame_control) ||
676 ieee80211_is_auth(hdr->frame_control))
679 return RX_DROP_MONITOR;
685 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
686 struct tid_ampdu_rx *tid_agg_rx,
688 struct sk_buff_head *frames)
690 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
691 struct ieee80211_rx_status *status;
693 lockdep_assert_held(&tid_agg_rx->reorder_lock);
698 /* release the frame from the reorder ring buffer */
699 tid_agg_rx->stored_mpdu_num--;
700 tid_agg_rx->reorder_buf[index] = NULL;
701 status = IEEE80211_SKB_RXCB(skb);
702 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
703 __skb_queue_tail(frames, skb);
706 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
709 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
710 struct tid_ampdu_rx *tid_agg_rx,
712 struct sk_buff_head *frames)
716 lockdep_assert_held(&tid_agg_rx->reorder_lock);
718 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
719 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
720 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
726 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
727 * the skb was added to the buffer longer than this time ago, the earlier
728 * frames that have not yet been received are assumed to be lost and the skb
729 * can be released for processing. This may also release other skb's from the
730 * reorder buffer if there are no additional gaps between the frames.
732 * Callers must hold tid_agg_rx->reorder_lock.
734 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
736 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
737 struct tid_ampdu_rx *tid_agg_rx,
738 struct sk_buff_head *frames)
742 lockdep_assert_held(&tid_agg_rx->reorder_lock);
744 /* release the buffer until next missing frame */
745 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
746 if (!tid_agg_rx->reorder_buf[index] &&
747 tid_agg_rx->stored_mpdu_num) {
749 * No buffers ready to be released, but check whether any
750 * frames in the reorder buffer have timed out.
753 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
754 j = (j + 1) % tid_agg_rx->buf_size) {
755 if (!tid_agg_rx->reorder_buf[j]) {
760 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
761 HT_RX_REORDER_BUF_TIMEOUT))
762 goto set_release_timer;
764 ht_dbg_ratelimited(sdata,
765 "release an RX reorder frame due to timeout on earlier frames\n");
766 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
770 * Increment the head seq# also for the skipped slots.
772 tid_agg_rx->head_seq_num =
773 (tid_agg_rx->head_seq_num +
774 skipped) & IEEE80211_SN_MASK;
777 } else while (tid_agg_rx->reorder_buf[index]) {
778 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
780 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
783 if (tid_agg_rx->stored_mpdu_num) {
784 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
786 for (; j != (index - 1) % tid_agg_rx->buf_size;
787 j = (j + 1) % tid_agg_rx->buf_size) {
788 if (tid_agg_rx->reorder_buf[j])
794 mod_timer(&tid_agg_rx->reorder_timer,
795 tid_agg_rx->reorder_time[j] + 1 +
796 HT_RX_REORDER_BUF_TIMEOUT);
798 del_timer(&tid_agg_rx->reorder_timer);
803 * As this function belongs to the RX path it must be under
804 * rcu_read_lock protection. It returns false if the frame
805 * can be processed immediately, true if it was consumed.
807 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
808 struct tid_ampdu_rx *tid_agg_rx,
810 struct sk_buff_head *frames)
812 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
813 u16 sc = le16_to_cpu(hdr->seq_ctrl);
814 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
815 u16 head_seq_num, buf_size;
819 spin_lock(&tid_agg_rx->reorder_lock);
821 buf_size = tid_agg_rx->buf_size;
822 head_seq_num = tid_agg_rx->head_seq_num;
824 /* frame with out of date sequence number */
825 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
831 * If frame the sequence number exceeds our buffering window
832 * size release some previous frames to make room for this one.
834 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
835 head_seq_num = ieee80211_sn_inc(
836 ieee80211_sn_sub(mpdu_seq_num, buf_size));
837 /* release stored frames up to new head to stack */
838 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
839 head_seq_num, frames);
842 /* Now the new frame is always in the range of the reordering buffer */
844 index = mpdu_seq_num % tid_agg_rx->buf_size;
846 /* check if we already stored this frame */
847 if (tid_agg_rx->reorder_buf[index]) {
853 * If the current MPDU is in the right order and nothing else
854 * is stored we can process it directly, no need to buffer it.
855 * If it is first but there's something stored, we may be able
856 * to release frames after this one.
858 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
859 tid_agg_rx->stored_mpdu_num == 0) {
860 tid_agg_rx->head_seq_num =
861 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
866 /* put the frame in the reordering buffer */
867 tid_agg_rx->reorder_buf[index] = skb;
868 tid_agg_rx->reorder_time[index] = jiffies;
869 tid_agg_rx->stored_mpdu_num++;
870 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
873 spin_unlock(&tid_agg_rx->reorder_lock);
878 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
879 * true if the MPDU was buffered, false if it should be processed.
881 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
882 struct sk_buff_head *frames)
884 struct sk_buff *skb = rx->skb;
885 struct ieee80211_local *local = rx->local;
886 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
887 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
888 struct sta_info *sta = rx->sta;
889 struct tid_ampdu_rx *tid_agg_rx;
893 if (!ieee80211_is_data_qos(hdr->frame_control) ||
894 is_multicast_ether_addr(hdr->addr1))
898 * filter the QoS data rx stream according to
899 * STA/TID and check if this STA/TID is on aggregation
905 ack_policy = *ieee80211_get_qos_ctl(hdr) &
906 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
907 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
909 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
913 /* qos null data frames are excluded */
914 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
917 /* not part of a BA session */
918 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
919 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
922 /* not actually part of this BA session */
923 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
926 /* new, potentially un-ordered, ampdu frame - process it */
928 /* reset session timer */
929 if (tid_agg_rx->timeout)
930 tid_agg_rx->last_rx = jiffies;
932 /* if this mpdu is fragmented - terminate rx aggregation session */
933 sc = le16_to_cpu(hdr->seq_ctrl);
934 if (sc & IEEE80211_SCTL_FRAG) {
935 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
936 skb_queue_tail(&rx->sdata->skb_queue, skb);
937 ieee80211_queue_work(&local->hw, &rx->sdata->work);
942 * No locking needed -- we will only ever process one
943 * RX packet at a time, and thus own tid_agg_rx. All
944 * other code manipulating it needs to (and does) make
945 * sure that we cannot get to it any more before doing
948 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
953 __skb_queue_tail(frames, skb);
956 static ieee80211_rx_result debug_noinline
957 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
959 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
960 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
963 * Drop duplicate 802.11 retransmissions
964 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
966 if (rx->skb->len >= 24 && rx->sta &&
967 !ieee80211_is_ctl(hdr->frame_control) &&
968 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
969 !is_multicast_ether_addr(hdr->addr1)) {
970 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
971 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
973 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
974 rx->local->dot11FrameDuplicateCount++;
975 rx->sta->num_duplicates++;
977 return RX_DROP_UNUSABLE;
978 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
979 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
983 if (unlikely(rx->skb->len < 16)) {
984 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
985 return RX_DROP_MONITOR;
988 /* Drop disallowed frame classes based on STA auth/assoc state;
989 * IEEE 802.11, Chap 5.5.
991 * mac80211 filters only based on association state, i.e. it drops
992 * Class 3 frames from not associated stations. hostapd sends
993 * deauth/disassoc frames when needed. In addition, hostapd is
994 * responsible for filtering on both auth and assoc states.
997 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
998 return ieee80211_rx_mesh_check(rx);
1000 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1001 ieee80211_is_pspoll(hdr->frame_control)) &&
1002 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1003 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1004 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1006 * accept port control frames from the AP even when it's not
1007 * yet marked ASSOC to prevent a race where we don't set the
1008 * assoc bit quickly enough before it sends the first frame
1010 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1011 ieee80211_is_data_present(hdr->frame_control)) {
1012 unsigned int hdrlen;
1015 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1017 if (rx->skb->len < hdrlen + 8)
1018 return RX_DROP_MONITOR;
1020 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1021 if (ethertype == rx->sdata->control_port_protocol)
1025 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1026 cfg80211_rx_spurious_frame(rx->sdata->dev,
1029 return RX_DROP_UNUSABLE;
1031 return RX_DROP_MONITOR;
1038 static ieee80211_rx_result debug_noinline
1039 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1041 struct ieee80211_local *local;
1042 struct ieee80211_hdr *hdr;
1043 struct sk_buff *skb;
1047 hdr = (struct ieee80211_hdr *) skb->data;
1049 if (!local->pspolling)
1052 if (!ieee80211_has_fromds(hdr->frame_control))
1053 /* this is not from AP */
1056 if (!ieee80211_is_data(hdr->frame_control))
1059 if (!ieee80211_has_moredata(hdr->frame_control)) {
1060 /* AP has no more frames buffered for us */
1061 local->pspolling = false;
1065 /* more data bit is set, let's request a new frame from the AP */
1066 ieee80211_send_pspoll(local, rx->sdata);
1071 static void sta_ps_start(struct sta_info *sta)
1073 struct ieee80211_sub_if_data *sdata = sta->sdata;
1074 struct ieee80211_local *local = sdata->local;
1077 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1078 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1079 ps = &sdata->bss->ps;
1083 atomic_inc(&ps->num_sta_ps);
1084 set_sta_flag(sta, WLAN_STA_PS_STA);
1085 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1086 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1087 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1088 sta->sta.addr, sta->sta.aid);
1091 static void sta_ps_end(struct sta_info *sta)
1093 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1094 sta->sta.addr, sta->sta.aid);
1096 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1098 * Clear the flag only if the other one is still set
1099 * so that the TX path won't start TX'ing new frames
1100 * directly ... In the case that the driver flag isn't
1101 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1103 clear_sta_flag(sta, WLAN_STA_PS_STA);
1104 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1105 sta->sta.addr, sta->sta.aid);
1109 ieee80211_sta_ps_deliver_wakeup(sta);
1112 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1114 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1117 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1119 /* Don't let the same PS state be set twice */
1120 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1121 if ((start && in_ps) || (!start && !in_ps))
1125 sta_ps_start(sta_inf);
1127 sta_ps_end(sta_inf);
1131 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1133 static ieee80211_rx_result debug_noinline
1134 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1136 struct ieee80211_sub_if_data *sdata = rx->sdata;
1137 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1138 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1141 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1144 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1145 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1149 * The device handles station powersave, so don't do anything about
1150 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1151 * it to mac80211 since they're handled.)
1153 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1157 * Don't do anything if the station isn't already asleep. In
1158 * the uAPSD case, the station will probably be marked asleep,
1159 * in the PS-Poll case the station must be confused ...
1161 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1164 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1165 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1166 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1167 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1169 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1172 /* Free PS Poll skb here instead of returning RX_DROP that would
1173 * count as an dropped frame. */
1174 dev_kfree_skb(rx->skb);
1177 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1178 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1179 ieee80211_has_pm(hdr->frame_control) &&
1180 (ieee80211_is_data_qos(hdr->frame_control) ||
1181 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1182 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1183 ac = ieee802_1d_to_ac[tid & 7];
1186 * If this AC is not trigger-enabled do nothing.
1188 * NB: This could/should check a separate bitmap of trigger-
1189 * enabled queues, but for now we only implement uAPSD w/o
1190 * TSPEC changes to the ACs, so they're always the same.
1192 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1195 /* if we are in a service period, do nothing */
1196 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1199 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1200 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1202 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1208 static ieee80211_rx_result debug_noinline
1209 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1211 struct sta_info *sta = rx->sta;
1212 struct sk_buff *skb = rx->skb;
1213 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1214 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1221 * Update last_rx only for IBSS packets which are for the current
1222 * BSSID and for station already AUTHORIZED to avoid keeping the
1223 * current IBSS network alive in cases where other STAs start
1224 * using different BSSID. This will also give the station another
1225 * chance to restart the authentication/authorization in case
1226 * something went wrong the first time.
1228 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1229 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1230 NL80211_IFTYPE_ADHOC);
1231 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1232 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1233 sta->last_rx = jiffies;
1234 if (ieee80211_is_data(hdr->frame_control) &&
1235 !is_multicast_ether_addr(hdr->addr1)) {
1236 sta->last_rx_rate_idx = status->rate_idx;
1237 sta->last_rx_rate_flag = status->flag;
1238 sta->last_rx_rate_vht_flag = status->vht_flag;
1239 sta->last_rx_rate_vht_nss = status->vht_nss;
1242 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1244 * Mesh beacons will update last_rx when if they are found to
1245 * match the current local configuration when processed.
1247 sta->last_rx = jiffies;
1248 if (ieee80211_is_data(hdr->frame_control)) {
1249 sta->last_rx_rate_idx = status->rate_idx;
1250 sta->last_rx_rate_flag = status->flag;
1251 sta->last_rx_rate_vht_flag = status->vht_flag;
1252 sta->last_rx_rate_vht_nss = status->vht_nss;
1256 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1259 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1260 ieee80211_sta_rx_notify(rx->sdata, hdr);
1262 sta->rx_fragments++;
1263 sta->rx_bytes += rx->skb->len;
1264 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1265 sta->last_signal = status->signal;
1266 ewma_add(&sta->avg_signal, -status->signal);
1269 if (status->chains) {
1270 sta->chains = status->chains;
1271 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1272 int signal = status->chain_signal[i];
1274 if (!(status->chains & BIT(i)))
1277 sta->chain_signal_last[i] = signal;
1278 ewma_add(&sta->chain_signal_avg[i], -signal);
1283 * Change STA power saving mode only at the end of a frame
1284 * exchange sequence.
1286 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1287 !ieee80211_has_morefrags(hdr->frame_control) &&
1288 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1289 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1290 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1291 /* PM bit is only checked in frames where it isn't reserved,
1292 * in AP mode it's reserved in non-bufferable management frames
1293 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1295 (!ieee80211_is_mgmt(hdr->frame_control) ||
1296 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1297 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1298 if (!ieee80211_has_pm(hdr->frame_control))
1301 if (ieee80211_has_pm(hdr->frame_control))
1306 /* mesh power save support */
1307 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1308 ieee80211_mps_rx_h_sta_process(sta, hdr);
1311 * Drop (qos-)data::nullfunc frames silently, since they
1312 * are used only to control station power saving mode.
1314 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1315 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1316 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1319 * If we receive a 4-addr nullfunc frame from a STA
1320 * that was not moved to a 4-addr STA vlan yet send
1321 * the event to userspace and for older hostapd drop
1322 * the frame to the monitor interface.
1324 if (ieee80211_has_a4(hdr->frame_control) &&
1325 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1326 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1327 !rx->sdata->u.vlan.sta))) {
1328 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1329 cfg80211_rx_unexpected_4addr_frame(
1330 rx->sdata->dev, sta->sta.addr,
1332 return RX_DROP_MONITOR;
1335 * Update counter and free packet here to avoid
1336 * counting this as a dropped packed.
1339 dev_kfree_skb(rx->skb);
1344 } /* ieee80211_rx_h_sta_process */
1346 static ieee80211_rx_result debug_noinline
1347 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1349 struct sk_buff *skb = rx->skb;
1350 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1351 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1354 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1355 struct ieee80211_key *sta_ptk = NULL;
1356 int mmie_keyidx = -1;
1358 const struct ieee80211_cipher_scheme *cs = NULL;
1363 * There are four types of keys:
1364 * - GTK (group keys)
1365 * - IGTK (group keys for management frames)
1366 * - PTK (pairwise keys)
1367 * - STK (station-to-station pairwise keys)
1369 * When selecting a key, we have to distinguish between multicast
1370 * (including broadcast) and unicast frames, the latter can only
1371 * use PTKs and STKs while the former always use GTKs and IGTKs.
1372 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1373 * unicast frames can also use key indices like GTKs. Hence, if we
1374 * don't have a PTK/STK we check the key index for a WEP key.
1376 * Note that in a regular BSS, multicast frames are sent by the
1377 * AP only, associated stations unicast the frame to the AP first
1378 * which then multicasts it on their behalf.
1380 * There is also a slight problem in IBSS mode: GTKs are negotiated
1381 * with each station, that is something we don't currently handle.
1382 * The spec seems to expect that one negotiates the same key with
1383 * every station but there's no such requirement; VLANs could be
1388 * No point in finding a key and decrypting if the frame is neither
1389 * addressed to us nor a multicast frame.
1391 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1394 /* start without a key */
1396 fc = hdr->frame_control;
1399 int keyid = rx->sta->ptk_idx;
1401 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1402 cs = rx->sta->cipher_scheme;
1403 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1404 if (unlikely(keyid < 0))
1405 return RX_DROP_UNUSABLE;
1407 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1410 if (!ieee80211_has_protected(fc))
1411 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1413 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1415 if ((status->flag & RX_FLAG_DECRYPTED) &&
1416 (status->flag & RX_FLAG_IV_STRIPPED))
1418 /* Skip decryption if the frame is not protected. */
1419 if (!ieee80211_has_protected(fc))
1421 } else if (mmie_keyidx >= 0) {
1422 /* Broadcast/multicast robust management frame / BIP */
1423 if ((status->flag & RX_FLAG_DECRYPTED) &&
1424 (status->flag & RX_FLAG_IV_STRIPPED))
1427 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1428 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1429 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1431 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1433 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1434 } else if (!ieee80211_has_protected(fc)) {
1436 * The frame was not protected, so skip decryption. However, we
1437 * need to set rx->key if there is a key that could have been
1438 * used so that the frame may be dropped if encryption would
1439 * have been expected.
1441 struct ieee80211_key *key = NULL;
1442 struct ieee80211_sub_if_data *sdata = rx->sdata;
1445 if (ieee80211_is_mgmt(fc) &&
1446 is_multicast_ether_addr(hdr->addr1) &&
1447 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1451 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1452 key = rcu_dereference(rx->sta->gtk[i]);
1458 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1459 key = rcu_dereference(sdata->keys[i]);
1472 * The device doesn't give us the IV so we won't be
1473 * able to look up the key. That's ok though, we
1474 * don't need to decrypt the frame, we just won't
1475 * be able to keep statistics accurate.
1476 * Except for key threshold notifications, should
1477 * we somehow allow the driver to tell us which key
1478 * the hardware used if this flag is set?
1480 if ((status->flag & RX_FLAG_DECRYPTED) &&
1481 (status->flag & RX_FLAG_IV_STRIPPED))
1484 hdrlen = ieee80211_hdrlen(fc);
1487 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1489 if (unlikely(keyidx < 0))
1490 return RX_DROP_UNUSABLE;
1492 if (rx->skb->len < 8 + hdrlen)
1493 return RX_DROP_UNUSABLE; /* TODO: count this? */
1495 * no need to call ieee80211_wep_get_keyidx,
1496 * it verifies a bunch of things we've done already
1498 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1499 keyidx = keyid >> 6;
1502 /* check per-station GTK first, if multicast packet */
1503 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1504 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1506 /* if not found, try default key */
1508 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1511 * RSNA-protected unicast frames should always be
1512 * sent with pairwise or station-to-station keys,
1513 * but for WEP we allow using a key index as well.
1516 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1517 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1518 !is_multicast_ether_addr(hdr->addr1))
1524 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1525 return RX_DROP_MONITOR;
1527 rx->key->tx_rx_count++;
1528 /* TODO: add threshold stuff again */
1530 return RX_DROP_MONITOR;
1533 switch (rx->key->conf.cipher) {
1534 case WLAN_CIPHER_SUITE_WEP40:
1535 case WLAN_CIPHER_SUITE_WEP104:
1536 result = ieee80211_crypto_wep_decrypt(rx);
1538 case WLAN_CIPHER_SUITE_TKIP:
1539 result = ieee80211_crypto_tkip_decrypt(rx);
1541 case WLAN_CIPHER_SUITE_CCMP:
1542 result = ieee80211_crypto_ccmp_decrypt(rx);
1544 case WLAN_CIPHER_SUITE_AES_CMAC:
1545 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1548 result = ieee80211_crypto_hw_decrypt(rx);
1551 /* the hdr variable is invalid after the decrypt handlers */
1553 /* either the frame has been decrypted or will be dropped */
1554 status->flag |= RX_FLAG_DECRYPTED;
1559 static inline struct ieee80211_fragment_entry *
1560 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1561 unsigned int frag, unsigned int seq, int rx_queue,
1562 struct sk_buff **skb)
1564 struct ieee80211_fragment_entry *entry;
1566 entry = &sdata->fragments[sdata->fragment_next++];
1567 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1568 sdata->fragment_next = 0;
1570 if (!skb_queue_empty(&entry->skb_list))
1571 __skb_queue_purge(&entry->skb_list);
1573 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1575 entry->first_frag_time = jiffies;
1577 entry->rx_queue = rx_queue;
1578 entry->last_frag = frag;
1580 entry->extra_len = 0;
1585 static inline struct ieee80211_fragment_entry *
1586 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1587 unsigned int frag, unsigned int seq,
1588 int rx_queue, struct ieee80211_hdr *hdr)
1590 struct ieee80211_fragment_entry *entry;
1593 idx = sdata->fragment_next;
1594 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1595 struct ieee80211_hdr *f_hdr;
1599 idx = IEEE80211_FRAGMENT_MAX - 1;
1601 entry = &sdata->fragments[idx];
1602 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1603 entry->rx_queue != rx_queue ||
1604 entry->last_frag + 1 != frag)
1607 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1610 * Check ftype and addresses are equal, else check next fragment
1612 if (((hdr->frame_control ^ f_hdr->frame_control) &
1613 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1614 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1615 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1618 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1619 __skb_queue_purge(&entry->skb_list);
1628 static ieee80211_rx_result debug_noinline
1629 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1631 struct ieee80211_hdr *hdr;
1634 unsigned int frag, seq;
1635 struct ieee80211_fragment_entry *entry;
1636 struct sk_buff *skb;
1637 struct ieee80211_rx_status *status;
1639 hdr = (struct ieee80211_hdr *)rx->skb->data;
1640 fc = hdr->frame_control;
1642 if (ieee80211_is_ctl(fc))
1645 sc = le16_to_cpu(hdr->seq_ctrl);
1646 frag = sc & IEEE80211_SCTL_FRAG;
1648 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1649 is_multicast_ether_addr(hdr->addr1))) {
1650 /* not fragmented */
1653 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1655 if (skb_linearize(rx->skb))
1656 return RX_DROP_UNUSABLE;
1659 * skb_linearize() might change the skb->data and
1660 * previously cached variables (in this case, hdr) need to
1661 * be refreshed with the new data.
1663 hdr = (struct ieee80211_hdr *)rx->skb->data;
1664 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1667 /* This is the first fragment of a new frame. */
1668 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1669 rx->seqno_idx, &(rx->skb));
1670 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1671 ieee80211_has_protected(fc)) {
1672 int queue = rx->security_idx;
1673 /* Store CCMP PN so that we can verify that the next
1674 * fragment has a sequential PN value. */
1676 memcpy(entry->last_pn,
1677 rx->key->u.ccmp.rx_pn[queue],
1678 IEEE80211_CCMP_PN_LEN);
1683 /* This is a fragment for a frame that should already be pending in
1684 * fragment cache. Add this fragment to the end of the pending entry.
1686 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1687 rx->seqno_idx, hdr);
1689 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1690 return RX_DROP_MONITOR;
1693 /* Verify that MPDUs within one MSDU have sequential PN values.
1694 * (IEEE 802.11i, 8.3.3.4.5) */
1697 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1699 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1700 return RX_DROP_UNUSABLE;
1701 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1702 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1707 queue = rx->security_idx;
1708 rpn = rx->key->u.ccmp.rx_pn[queue];
1709 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1710 return RX_DROP_UNUSABLE;
1711 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1714 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1715 __skb_queue_tail(&entry->skb_list, rx->skb);
1716 entry->last_frag = frag;
1717 entry->extra_len += rx->skb->len;
1718 if (ieee80211_has_morefrags(fc)) {
1723 rx->skb = __skb_dequeue(&entry->skb_list);
1724 if (skb_tailroom(rx->skb) < entry->extra_len) {
1725 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1726 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1728 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1729 __skb_queue_purge(&entry->skb_list);
1730 return RX_DROP_UNUSABLE;
1733 while ((skb = __skb_dequeue(&entry->skb_list))) {
1734 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1738 /* Complete frame has been reassembled - process it now */
1739 status = IEEE80211_SKB_RXCB(rx->skb);
1740 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1744 rx->sta->rx_packets++;
1745 if (is_multicast_ether_addr(hdr->addr1))
1746 rx->local->dot11MulticastReceivedFrameCount++;
1748 ieee80211_led_rx(rx->local);
1752 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1754 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1760 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1762 struct sk_buff *skb = rx->skb;
1763 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1766 * Pass through unencrypted frames if the hardware has
1767 * decrypted them already.
1769 if (status->flag & RX_FLAG_DECRYPTED)
1772 /* Drop unencrypted frames if key is set. */
1773 if (unlikely(!ieee80211_has_protected(fc) &&
1774 !ieee80211_is_nullfunc(fc) &&
1775 ieee80211_is_data(fc) &&
1776 (rx->key || rx->sdata->drop_unencrypted)))
1782 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1784 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1785 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1786 __le16 fc = hdr->frame_control;
1789 * Pass through unencrypted frames if the hardware has
1790 * decrypted them already.
1792 if (status->flag & RX_FLAG_DECRYPTED)
1795 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1796 if (unlikely(!ieee80211_has_protected(fc) &&
1797 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1799 if (ieee80211_is_deauth(fc) ||
1800 ieee80211_is_disassoc(fc))
1801 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1806 /* BIP does not use Protected field, so need to check MMIE */
1807 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1808 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1809 if (ieee80211_is_deauth(fc) ||
1810 ieee80211_is_disassoc(fc))
1811 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1817 * When using MFP, Action frames are not allowed prior to
1818 * having configured keys.
1820 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1821 ieee80211_is_robust_mgmt_frame(rx->skb)))
1829 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1831 struct ieee80211_sub_if_data *sdata = rx->sdata;
1832 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1833 bool check_port_control = false;
1834 struct ethhdr *ehdr;
1837 *port_control = false;
1838 if (ieee80211_has_a4(hdr->frame_control) &&
1839 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1842 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1843 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1845 if (!sdata->u.mgd.use_4addr)
1848 check_port_control = true;
1851 if (is_multicast_ether_addr(hdr->addr1) &&
1852 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1855 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1859 ehdr = (struct ethhdr *) rx->skb->data;
1860 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1861 *port_control = true;
1862 else if (check_port_control)
1869 * requires that rx->skb is a frame with ethernet header
1871 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1873 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1874 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1875 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1878 * Allow EAPOL frames to us/the PAE group address regardless
1879 * of whether the frame was encrypted or not.
1881 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1882 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1883 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1886 if (ieee80211_802_1x_port_control(rx) ||
1887 ieee80211_drop_unencrypted(rx, fc))
1894 * requires that rx->skb is a frame with ethernet header
1897 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1899 struct ieee80211_sub_if_data *sdata = rx->sdata;
1900 struct net_device *dev = sdata->dev;
1901 struct sk_buff *skb, *xmit_skb;
1902 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1903 struct sta_info *dsta;
1904 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1909 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1910 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1911 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1912 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1913 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1914 if (is_multicast_ether_addr(ehdr->h_dest)) {
1916 * send multicast frames both to higher layers in
1917 * local net stack and back to the wireless medium
1919 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1921 net_info_ratelimited("%s: failed to clone multicast frame\n",
1924 dsta = sta_info_get(sdata, skb->data);
1927 * The destination station is associated to
1928 * this AP (in this VLAN), so send the frame
1929 * directly to it and do not pass it to local
1938 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1940 /* 'align' will only take the values 0 or 2 here since all
1941 * frames are required to be aligned to 2-byte boundaries
1942 * when being passed to mac80211; the code here works just
1943 * as well if that isn't true, but mac80211 assumes it can
1944 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1948 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
1950 if (WARN_ON(skb_headroom(skb) < 3)) {
1954 u8 *data = skb->data;
1955 size_t len = skb_headlen(skb);
1957 memmove(skb->data, data, len);
1958 skb_set_tail_pointer(skb, len);
1965 /* deliver to local stack */
1966 skb->protocol = eth_type_trans(skb, dev);
1967 memset(skb->cb, 0, sizeof(skb->cb));
1968 if (rx->local->napi)
1969 napi_gro_receive(rx->local->napi, skb);
1971 netif_receive_skb(skb);
1976 * Send to wireless media and increase priority by 256 to
1977 * keep the received priority instead of reclassifying
1978 * the frame (see cfg80211_classify8021d).
1980 xmit_skb->priority += 256;
1981 xmit_skb->protocol = htons(ETH_P_802_3);
1982 skb_reset_network_header(xmit_skb);
1983 skb_reset_mac_header(xmit_skb);
1984 dev_queue_xmit(xmit_skb);
1988 static ieee80211_rx_result debug_noinline
1989 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1991 struct net_device *dev = rx->sdata->dev;
1992 struct sk_buff *skb = rx->skb;
1993 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1994 __le16 fc = hdr->frame_control;
1995 struct sk_buff_head frame_list;
1996 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1998 if (unlikely(!ieee80211_is_data(fc)))
2001 if (unlikely(!ieee80211_is_data_present(fc)))
2002 return RX_DROP_MONITOR;
2004 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2007 if (ieee80211_has_a4(hdr->frame_control) &&
2008 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2009 !rx->sdata->u.vlan.sta)
2010 return RX_DROP_UNUSABLE;
2012 if (is_multicast_ether_addr(hdr->addr1) &&
2013 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2014 rx->sdata->u.vlan.sta) ||
2015 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2016 rx->sdata->u.mgd.use_4addr)))
2017 return RX_DROP_UNUSABLE;
2020 __skb_queue_head_init(&frame_list);
2022 if (skb_linearize(skb))
2023 return RX_DROP_UNUSABLE;
2025 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2026 rx->sdata->vif.type,
2027 rx->local->hw.extra_tx_headroom, true);
2029 while (!skb_queue_empty(&frame_list)) {
2030 rx->skb = __skb_dequeue(&frame_list);
2032 if (!ieee80211_frame_allowed(rx, fc)) {
2033 dev_kfree_skb(rx->skb);
2036 dev->stats.rx_packets++;
2037 dev->stats.rx_bytes += rx->skb->len;
2039 ieee80211_deliver_skb(rx);
2045 #ifdef CONFIG_MAC80211_MESH
2046 static ieee80211_rx_result
2047 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2049 struct ieee80211_hdr *fwd_hdr, *hdr;
2050 struct ieee80211_tx_info *info;
2051 struct ieee80211s_hdr *mesh_hdr;
2052 struct sk_buff *skb = rx->skb, *fwd_skb;
2053 struct ieee80211_local *local = rx->local;
2054 struct ieee80211_sub_if_data *sdata = rx->sdata;
2055 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2056 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2059 hdr = (struct ieee80211_hdr *) skb->data;
2060 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2062 /* make sure fixed part of mesh header is there, also checks skb len */
2063 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2064 return RX_DROP_MONITOR;
2066 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2068 /* make sure full mesh header is there, also checks skb len */
2069 if (!pskb_may_pull(rx->skb,
2070 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2071 return RX_DROP_MONITOR;
2073 /* reload pointers */
2074 hdr = (struct ieee80211_hdr *) skb->data;
2075 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2077 /* frame is in RMC, don't forward */
2078 if (ieee80211_is_data(hdr->frame_control) &&
2079 is_multicast_ether_addr(hdr->addr1) &&
2080 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2081 return RX_DROP_MONITOR;
2083 if (!ieee80211_is_data(hdr->frame_control) ||
2084 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2088 return RX_DROP_MONITOR;
2090 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2091 struct mesh_path *mppath;
2095 if (is_multicast_ether_addr(hdr->addr1)) {
2096 mpp_addr = hdr->addr3;
2097 proxied_addr = mesh_hdr->eaddr1;
2098 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2099 /* has_a4 already checked in ieee80211_rx_mesh_check */
2100 mpp_addr = hdr->addr4;
2101 proxied_addr = mesh_hdr->eaddr2;
2103 return RX_DROP_MONITOR;
2107 mppath = mpp_path_lookup(sdata, proxied_addr);
2109 mpp_path_add(sdata, proxied_addr, mpp_addr);
2111 spin_lock_bh(&mppath->state_lock);
2112 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2113 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2114 spin_unlock_bh(&mppath->state_lock);
2119 /* Frame has reached destination. Don't forward */
2120 if (!is_multicast_ether_addr(hdr->addr1) &&
2121 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2124 q = ieee80211_select_queue_80211(sdata, skb, hdr);
2125 if (ieee80211_queue_stopped(&local->hw, q)) {
2126 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2127 return RX_DROP_MONITOR;
2129 skb_set_queue_mapping(skb, q);
2131 if (!--mesh_hdr->ttl) {
2132 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2136 if (!ifmsh->mshcfg.dot11MeshForwarding)
2139 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2141 net_info_ratelimited("%s: failed to clone mesh frame\n",
2146 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2147 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2148 info = IEEE80211_SKB_CB(fwd_skb);
2149 memset(info, 0, sizeof(*info));
2150 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2151 info->control.vif = &rx->sdata->vif;
2152 info->control.jiffies = jiffies;
2153 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2154 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2155 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2156 /* update power mode indication when forwarding */
2157 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2158 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2159 /* mesh power mode flags updated in mesh_nexthop_lookup */
2160 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2162 /* unable to resolve next hop */
2163 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2165 WLAN_REASON_MESH_PATH_NOFORWARD,
2167 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2169 return RX_DROP_MONITOR;
2172 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2173 ieee80211_add_pending_skb(local, fwd_skb);
2175 if (is_multicast_ether_addr(hdr->addr1) ||
2176 sdata->dev->flags & IFF_PROMISC)
2179 return RX_DROP_MONITOR;
2183 static ieee80211_rx_result debug_noinline
2184 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2186 struct ieee80211_sub_if_data *sdata = rx->sdata;
2187 struct ieee80211_local *local = rx->local;
2188 struct net_device *dev = sdata->dev;
2189 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2190 __le16 fc = hdr->frame_control;
2194 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2197 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2198 return RX_DROP_MONITOR;
2201 * Send unexpected-4addr-frame event to hostapd. For older versions,
2202 * also drop the frame to cooked monitor interfaces.
2204 if (ieee80211_has_a4(hdr->frame_control) &&
2205 sdata->vif.type == NL80211_IFTYPE_AP) {
2207 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2208 cfg80211_rx_unexpected_4addr_frame(
2209 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2210 return RX_DROP_MONITOR;
2213 err = __ieee80211_data_to_8023(rx, &port_control);
2215 return RX_DROP_UNUSABLE;
2217 if (!ieee80211_frame_allowed(rx, fc))
2218 return RX_DROP_MONITOR;
2220 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2221 unlikely(port_control) && sdata->bss) {
2222 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2230 dev->stats.rx_packets++;
2231 dev->stats.rx_bytes += rx->skb->len;
2233 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2234 !is_multicast_ether_addr(
2235 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2236 (!local->scanning &&
2237 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2238 mod_timer(&local->dynamic_ps_timer, jiffies +
2239 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2242 ieee80211_deliver_skb(rx);
2247 static ieee80211_rx_result debug_noinline
2248 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2250 struct sk_buff *skb = rx->skb;
2251 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2252 struct tid_ampdu_rx *tid_agg_rx;
2256 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2259 if (ieee80211_is_back_req(bar->frame_control)) {
2261 __le16 control, start_seq_num;
2262 } __packed bar_data;
2265 return RX_DROP_MONITOR;
2267 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2268 &bar_data, sizeof(bar_data)))
2269 return RX_DROP_MONITOR;
2271 tid = le16_to_cpu(bar_data.control) >> 12;
2273 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2275 return RX_DROP_MONITOR;
2277 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2279 /* reset session timer */
2280 if (tid_agg_rx->timeout)
2281 mod_timer(&tid_agg_rx->session_timer,
2282 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2284 spin_lock(&tid_agg_rx->reorder_lock);
2285 /* release stored frames up to start of BAR */
2286 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2287 start_seq_num, frames);
2288 spin_unlock(&tid_agg_rx->reorder_lock);
2295 * After this point, we only want management frames,
2296 * so we can drop all remaining control frames to
2297 * cooked monitor interfaces.
2299 return RX_DROP_MONITOR;
2302 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2303 struct ieee80211_mgmt *mgmt,
2306 struct ieee80211_local *local = sdata->local;
2307 struct sk_buff *skb;
2308 struct ieee80211_mgmt *resp;
2310 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2311 /* Not to own unicast address */
2315 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2316 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2317 /* Not from the current AP or not associated yet. */
2321 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2322 /* Too short SA Query request frame */
2326 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2330 skb_reserve(skb, local->hw.extra_tx_headroom);
2331 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2332 memset(resp, 0, 24);
2333 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2334 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2335 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2336 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2337 IEEE80211_STYPE_ACTION);
2338 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2339 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2340 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2341 memcpy(resp->u.action.u.sa_query.trans_id,
2342 mgmt->u.action.u.sa_query.trans_id,
2343 WLAN_SA_QUERY_TR_ID_LEN);
2345 ieee80211_tx_skb(sdata, skb);
2348 static ieee80211_rx_result debug_noinline
2349 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2351 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2352 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2355 * From here on, look only at management frames.
2356 * Data and control frames are already handled,
2357 * and unknown (reserved) frames are useless.
2359 if (rx->skb->len < 24)
2360 return RX_DROP_MONITOR;
2362 if (!ieee80211_is_mgmt(mgmt->frame_control))
2363 return RX_DROP_MONITOR;
2365 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2366 ieee80211_is_beacon(mgmt->frame_control) &&
2367 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2370 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2371 sig = status->signal;
2373 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2374 rx->skb->data, rx->skb->len,
2376 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2379 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2380 return RX_DROP_MONITOR;
2382 if (ieee80211_drop_unencrypted_mgmt(rx))
2383 return RX_DROP_UNUSABLE;
2388 static ieee80211_rx_result debug_noinline
2389 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2391 struct ieee80211_local *local = rx->local;
2392 struct ieee80211_sub_if_data *sdata = rx->sdata;
2393 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2394 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2395 int len = rx->skb->len;
2397 if (!ieee80211_is_action(mgmt->frame_control))
2400 /* drop too small frames */
2401 if (len < IEEE80211_MIN_ACTION_SIZE)
2402 return RX_DROP_UNUSABLE;
2404 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2405 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2406 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2407 return RX_DROP_UNUSABLE;
2409 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2410 return RX_DROP_UNUSABLE;
2412 switch (mgmt->u.action.category) {
2413 case WLAN_CATEGORY_HT:
2414 /* reject HT action frames from stations not supporting HT */
2415 if (!rx->sta->sta.ht_cap.ht_supported)
2418 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2419 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2420 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2421 sdata->vif.type != NL80211_IFTYPE_AP &&
2422 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2425 /* verify action & smps_control/chanwidth are present */
2426 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2429 switch (mgmt->u.action.u.ht_smps.action) {
2430 case WLAN_HT_ACTION_SMPS: {
2431 struct ieee80211_supported_band *sband;
2432 enum ieee80211_smps_mode smps_mode;
2434 /* convert to HT capability */
2435 switch (mgmt->u.action.u.ht_smps.smps_control) {
2436 case WLAN_HT_SMPS_CONTROL_DISABLED:
2437 smps_mode = IEEE80211_SMPS_OFF;
2439 case WLAN_HT_SMPS_CONTROL_STATIC:
2440 smps_mode = IEEE80211_SMPS_STATIC;
2442 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2443 smps_mode = IEEE80211_SMPS_DYNAMIC;
2449 /* if no change do nothing */
2450 if (rx->sta->sta.smps_mode == smps_mode)
2452 rx->sta->sta.smps_mode = smps_mode;
2454 sband = rx->local->hw.wiphy->bands[status->band];
2456 rate_control_rate_update(local, sband, rx->sta,
2457 IEEE80211_RC_SMPS_CHANGED);
2460 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2461 struct ieee80211_supported_band *sband;
2462 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2463 enum ieee80211_sta_rx_bandwidth new_bw;
2465 /* If it doesn't support 40 MHz it can't change ... */
2466 if (!(rx->sta->sta.ht_cap.cap &
2467 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2470 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2471 new_bw = IEEE80211_STA_RX_BW_20;
2473 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2475 if (rx->sta->sta.bandwidth == new_bw)
2478 sband = rx->local->hw.wiphy->bands[status->band];
2480 rate_control_rate_update(local, sband, rx->sta,
2481 IEEE80211_RC_BW_CHANGED);
2489 case WLAN_CATEGORY_PUBLIC:
2490 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2492 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2496 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2498 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2499 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2501 if (len < offsetof(struct ieee80211_mgmt,
2502 u.action.u.ext_chan_switch.variable))
2505 case WLAN_CATEGORY_VHT:
2506 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2507 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2508 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2509 sdata->vif.type != NL80211_IFTYPE_AP &&
2510 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2513 /* verify action code is present */
2514 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2517 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2518 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2521 /* verify opmode is present */
2522 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2525 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2527 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2528 opmode, status->band,
2536 case WLAN_CATEGORY_BACK:
2537 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2538 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2539 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2540 sdata->vif.type != NL80211_IFTYPE_AP &&
2541 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2544 /* verify action_code is present */
2545 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2548 switch (mgmt->u.action.u.addba_req.action_code) {
2549 case WLAN_ACTION_ADDBA_REQ:
2550 if (len < (IEEE80211_MIN_ACTION_SIZE +
2551 sizeof(mgmt->u.action.u.addba_req)))
2554 case WLAN_ACTION_ADDBA_RESP:
2555 if (len < (IEEE80211_MIN_ACTION_SIZE +
2556 sizeof(mgmt->u.action.u.addba_resp)))
2559 case WLAN_ACTION_DELBA:
2560 if (len < (IEEE80211_MIN_ACTION_SIZE +
2561 sizeof(mgmt->u.action.u.delba)))
2569 case WLAN_CATEGORY_SPECTRUM_MGMT:
2570 /* verify action_code is present */
2571 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2574 switch (mgmt->u.action.u.measurement.action_code) {
2575 case WLAN_ACTION_SPCT_MSR_REQ:
2576 if (status->band != IEEE80211_BAND_5GHZ)
2579 if (len < (IEEE80211_MIN_ACTION_SIZE +
2580 sizeof(mgmt->u.action.u.measurement)))
2583 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2586 ieee80211_process_measurement_req(sdata, mgmt, len);
2588 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2590 if (len < (IEEE80211_MIN_ACTION_SIZE +
2591 sizeof(mgmt->u.action.u.chan_switch)))
2594 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2595 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2596 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2599 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2600 bssid = sdata->u.mgd.bssid;
2601 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2602 bssid = sdata->u.ibss.bssid;
2603 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2608 if (!ether_addr_equal(mgmt->bssid, bssid))
2615 case WLAN_CATEGORY_SA_QUERY:
2616 if (len < (IEEE80211_MIN_ACTION_SIZE +
2617 sizeof(mgmt->u.action.u.sa_query)))
2620 switch (mgmt->u.action.u.sa_query.action) {
2621 case WLAN_ACTION_SA_QUERY_REQUEST:
2622 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2624 ieee80211_process_sa_query_req(sdata, mgmt, len);
2628 case WLAN_CATEGORY_SELF_PROTECTED:
2629 if (len < (IEEE80211_MIN_ACTION_SIZE +
2630 sizeof(mgmt->u.action.u.self_prot.action_code)))
2633 switch (mgmt->u.action.u.self_prot.action_code) {
2634 case WLAN_SP_MESH_PEERING_OPEN:
2635 case WLAN_SP_MESH_PEERING_CLOSE:
2636 case WLAN_SP_MESH_PEERING_CONFIRM:
2637 if (!ieee80211_vif_is_mesh(&sdata->vif))
2639 if (sdata->u.mesh.user_mpm)
2640 /* userspace handles this frame */
2643 case WLAN_SP_MGK_INFORM:
2644 case WLAN_SP_MGK_ACK:
2645 if (!ieee80211_vif_is_mesh(&sdata->vif))
2650 case WLAN_CATEGORY_MESH_ACTION:
2651 if (len < (IEEE80211_MIN_ACTION_SIZE +
2652 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2655 if (!ieee80211_vif_is_mesh(&sdata->vif))
2657 if (mesh_action_is_path_sel(mgmt) &&
2658 !mesh_path_sel_is_hwmp(sdata))
2666 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2667 /* will return in the next handlers */
2672 rx->sta->rx_packets++;
2673 dev_kfree_skb(rx->skb);
2677 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2678 skb_queue_tail(&sdata->skb_queue, rx->skb);
2679 ieee80211_queue_work(&local->hw, &sdata->work);
2681 rx->sta->rx_packets++;
2685 static ieee80211_rx_result debug_noinline
2686 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2688 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2691 /* skip known-bad action frames and return them in the next handler */
2692 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2696 * Getting here means the kernel doesn't know how to handle
2697 * it, but maybe userspace does ... include returned frames
2698 * so userspace can register for those to know whether ones
2699 * it transmitted were processed or returned.
2702 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2703 sig = status->signal;
2705 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2706 rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2708 rx->sta->rx_packets++;
2709 dev_kfree_skb(rx->skb);
2716 static ieee80211_rx_result debug_noinline
2717 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2719 struct ieee80211_local *local = rx->local;
2720 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2721 struct sk_buff *nskb;
2722 struct ieee80211_sub_if_data *sdata = rx->sdata;
2723 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2725 if (!ieee80211_is_action(mgmt->frame_control))
2729 * For AP mode, hostapd is responsible for handling any action
2730 * frames that we didn't handle, including returning unknown
2731 * ones. For all other modes we will return them to the sender,
2732 * setting the 0x80 bit in the action category, as required by
2733 * 802.11-2012 9.24.4.
2734 * Newer versions of hostapd shall also use the management frame
2735 * registration mechanisms, but older ones still use cooked
2736 * monitor interfaces so push all frames there.
2738 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2739 (sdata->vif.type == NL80211_IFTYPE_AP ||
2740 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2741 return RX_DROP_MONITOR;
2743 if (is_multicast_ether_addr(mgmt->da))
2744 return RX_DROP_MONITOR;
2746 /* do not return rejected action frames */
2747 if (mgmt->u.action.category & 0x80)
2748 return RX_DROP_UNUSABLE;
2750 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2753 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2755 nmgmt->u.action.category |= 0x80;
2756 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2757 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2759 memset(nskb->cb, 0, sizeof(nskb->cb));
2761 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2762 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2764 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2765 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2766 IEEE80211_TX_CTL_NO_CCK_RATE;
2767 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2769 local->hw.offchannel_tx_hw_queue;
2772 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2775 dev_kfree_skb(rx->skb);
2779 static ieee80211_rx_result debug_noinline
2780 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2782 struct ieee80211_sub_if_data *sdata = rx->sdata;
2783 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2786 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2788 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2789 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2790 sdata->vif.type != NL80211_IFTYPE_STATION)
2791 return RX_DROP_MONITOR;
2794 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2795 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2796 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2797 /* process for all: mesh, mlme, ibss */
2799 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2800 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2801 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2802 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2803 if (is_multicast_ether_addr(mgmt->da) &&
2804 !is_broadcast_ether_addr(mgmt->da))
2805 return RX_DROP_MONITOR;
2807 /* process only for station */
2808 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2809 return RX_DROP_MONITOR;
2811 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2812 /* process only for ibss and mesh */
2813 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2814 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2815 return RX_DROP_MONITOR;
2818 return RX_DROP_MONITOR;
2821 /* queue up frame and kick off work to process it */
2822 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2823 skb_queue_tail(&sdata->skb_queue, rx->skb);
2824 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2826 rx->sta->rx_packets++;
2831 /* TODO: use IEEE80211_RX_FRAGMENTED */
2832 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2833 struct ieee80211_rate *rate)
2835 struct ieee80211_sub_if_data *sdata;
2836 struct ieee80211_local *local = rx->local;
2837 struct sk_buff *skb = rx->skb, *skb2;
2838 struct net_device *prev_dev = NULL;
2839 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2840 int needed_headroom;
2843 * If cooked monitor has been processed already, then
2844 * don't do it again. If not, set the flag.
2846 if (rx->flags & IEEE80211_RX_CMNTR)
2848 rx->flags |= IEEE80211_RX_CMNTR;
2850 /* If there are no cooked monitor interfaces, just free the SKB */
2851 if (!local->cooked_mntrs)
2854 /* room for the radiotap header based on driver features */
2855 needed_headroom = ieee80211_rx_radiotap_space(local, status);
2857 if (skb_headroom(skb) < needed_headroom &&
2858 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2861 /* prepend radiotap information */
2862 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2865 skb_set_mac_header(skb, 0);
2866 skb->ip_summed = CHECKSUM_UNNECESSARY;
2867 skb->pkt_type = PACKET_OTHERHOST;
2868 skb->protocol = htons(ETH_P_802_2);
2870 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2871 if (!ieee80211_sdata_running(sdata))
2874 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2875 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2879 skb2 = skb_clone(skb, GFP_ATOMIC);
2881 skb2->dev = prev_dev;
2882 netif_receive_skb(skb2);
2886 prev_dev = sdata->dev;
2887 sdata->dev->stats.rx_packets++;
2888 sdata->dev->stats.rx_bytes += skb->len;
2892 skb->dev = prev_dev;
2893 netif_receive_skb(skb);
2901 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2902 ieee80211_rx_result res)
2905 case RX_DROP_MONITOR:
2906 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2908 rx->sta->rx_dropped++;
2911 struct ieee80211_rate *rate = NULL;
2912 struct ieee80211_supported_band *sband;
2913 struct ieee80211_rx_status *status;
2915 status = IEEE80211_SKB_RXCB((rx->skb));
2917 sband = rx->local->hw.wiphy->bands[status->band];
2918 if (!(status->flag & RX_FLAG_HT) &&
2919 !(status->flag & RX_FLAG_VHT))
2920 rate = &sband->bitrates[status->rate_idx];
2922 ieee80211_rx_cooked_monitor(rx, rate);
2925 case RX_DROP_UNUSABLE:
2926 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2928 rx->sta->rx_dropped++;
2929 dev_kfree_skb(rx->skb);
2932 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2937 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2938 struct sk_buff_head *frames)
2940 ieee80211_rx_result res = RX_DROP_MONITOR;
2941 struct sk_buff *skb;
2943 #define CALL_RXH(rxh) \
2946 if (res != RX_CONTINUE) \
2950 spin_lock_bh(&rx->local->rx_path_lock);
2952 while ((skb = __skb_dequeue(frames))) {
2954 * all the other fields are valid across frames
2955 * that belong to an aMPDU since they are on the
2956 * same TID from the same station
2960 CALL_RXH(ieee80211_rx_h_check_more_data)
2961 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2962 CALL_RXH(ieee80211_rx_h_sta_process)
2963 CALL_RXH(ieee80211_rx_h_decrypt)
2964 CALL_RXH(ieee80211_rx_h_defragment)
2965 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2966 /* must be after MMIC verify so header is counted in MPDU mic */
2967 #ifdef CONFIG_MAC80211_MESH
2968 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2969 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2971 CALL_RXH(ieee80211_rx_h_amsdu)
2972 CALL_RXH(ieee80211_rx_h_data)
2974 /* special treatment -- needs the queue */
2975 res = ieee80211_rx_h_ctrl(rx, frames);
2976 if (res != RX_CONTINUE)
2979 CALL_RXH(ieee80211_rx_h_mgmt_check)
2980 CALL_RXH(ieee80211_rx_h_action)
2981 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2982 CALL_RXH(ieee80211_rx_h_action_return)
2983 CALL_RXH(ieee80211_rx_h_mgmt)
2986 ieee80211_rx_handlers_result(rx, res);
2991 spin_unlock_bh(&rx->local->rx_path_lock);
2994 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2996 struct sk_buff_head reorder_release;
2997 ieee80211_rx_result res = RX_DROP_MONITOR;
2999 __skb_queue_head_init(&reorder_release);
3001 #define CALL_RXH(rxh) \
3004 if (res != RX_CONTINUE) \
3008 CALL_RXH(ieee80211_rx_h_check)
3010 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3012 ieee80211_rx_handlers(rx, &reorder_release);
3016 ieee80211_rx_handlers_result(rx, res);
3022 * This function makes calls into the RX path, therefore
3023 * it has to be invoked under RCU read lock.
3025 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3027 struct sk_buff_head frames;
3028 struct ieee80211_rx_data rx = {
3030 .sdata = sta->sdata,
3031 .local = sta->local,
3032 /* This is OK -- must be QoS data frame */
3033 .security_idx = tid,
3037 struct tid_ampdu_rx *tid_agg_rx;
3039 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3043 __skb_queue_head_init(&frames);
3045 spin_lock(&tid_agg_rx->reorder_lock);
3046 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3047 spin_unlock(&tid_agg_rx->reorder_lock);
3049 ieee80211_rx_handlers(&rx, &frames);
3052 /* main receive path */
3054 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3055 struct ieee80211_hdr *hdr)
3057 struct ieee80211_sub_if_data *sdata = rx->sdata;
3058 struct sk_buff *skb = rx->skb;
3059 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3060 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3061 int multicast = is_multicast_ether_addr(hdr->addr1);
3063 switch (sdata->vif.type) {
3064 case NL80211_IFTYPE_STATION:
3065 if (!bssid && !sdata->u.mgd.use_4addr)
3068 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3069 if (!(sdata->dev->flags & IFF_PROMISC) ||
3070 sdata->u.mgd.use_4addr)
3072 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3075 case NL80211_IFTYPE_ADHOC:
3078 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3079 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3081 if (ieee80211_is_beacon(hdr->frame_control)) {
3083 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3085 } else if (!multicast &&
3086 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3087 if (!(sdata->dev->flags & IFF_PROMISC))
3089 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3090 } else if (!rx->sta) {
3092 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3093 rate_idx = 0; /* TODO: HT/VHT rates */
3095 rate_idx = status->rate_idx;
3096 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3100 case NL80211_IFTYPE_MESH_POINT:
3102 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3103 if (!(sdata->dev->flags & IFF_PROMISC))
3106 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3109 case NL80211_IFTYPE_AP_VLAN:
3110 case NL80211_IFTYPE_AP:
3112 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3114 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3116 * Accept public action frames even when the
3117 * BSSID doesn't match, this is used for P2P
3118 * and location updates. Note that mac80211
3119 * itself never looks at these frames.
3122 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3124 if (ieee80211_is_public_action(hdr, skb->len))
3126 if (!ieee80211_is_beacon(hdr->frame_control))
3128 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3131 case NL80211_IFTYPE_WDS:
3132 if (bssid || !ieee80211_is_data(hdr->frame_control))
3134 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3137 case NL80211_IFTYPE_P2P_DEVICE:
3138 if (!ieee80211_is_public_action(hdr, skb->len) &&
3139 !ieee80211_is_probe_req(hdr->frame_control) &&
3140 !ieee80211_is_probe_resp(hdr->frame_control) &&
3141 !ieee80211_is_beacon(hdr->frame_control))
3143 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3145 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3148 /* should never get here */
3157 * This function returns whether or not the SKB
3158 * was destined for RX processing or not, which,
3159 * if consume is true, is equivalent to whether
3160 * or not the skb was consumed.
3162 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3163 struct sk_buff *skb, bool consume)
3165 struct ieee80211_local *local = rx->local;
3166 struct ieee80211_sub_if_data *sdata = rx->sdata;
3167 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3168 struct ieee80211_hdr *hdr = (void *)skb->data;
3171 status->rx_flags |= IEEE80211_RX_RA_MATCH;
3173 if (!prepare_for_handlers(rx, hdr))
3177 skb = skb_copy(skb, GFP_ATOMIC);
3179 if (net_ratelimit())
3180 wiphy_debug(local->hw.wiphy,
3181 "failed to copy skb for %s\n",
3189 ieee80211_invoke_rx_handlers(rx);
3194 * This is the actual Rx frames handler. as it blongs to Rx path it must
3195 * be called with rcu_read_lock protection.
3197 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3198 struct sk_buff *skb)
3200 struct ieee80211_local *local = hw_to_local(hw);
3201 struct ieee80211_sub_if_data *sdata;
3202 struct ieee80211_hdr *hdr;
3204 struct ieee80211_rx_data rx;
3205 struct ieee80211_sub_if_data *prev;
3206 struct sta_info *sta, *tmp, *prev_sta;
3209 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3210 memset(&rx, 0, sizeof(rx));
3214 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3215 local->dot11ReceivedFragmentCount++;
3217 if (ieee80211_is_mgmt(fc)) {
3218 /* drop frame if too short for header */
3219 if (skb->len < ieee80211_hdrlen(fc))
3222 err = skb_linearize(skb);
3224 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3232 hdr = (struct ieee80211_hdr *)skb->data;
3233 ieee80211_parse_qos(&rx);
3234 ieee80211_verify_alignment(&rx);
3236 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3237 ieee80211_is_beacon(hdr->frame_control)))
3238 ieee80211_scan_rx(local, skb);
3240 if (ieee80211_is_data(fc)) {
3243 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3250 rx.sdata = prev_sta->sdata;
3251 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3258 rx.sdata = prev_sta->sdata;
3260 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3268 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3269 if (!ieee80211_sdata_running(sdata))
3272 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3273 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3277 * frame is destined for this interface, but if it's
3278 * not also for the previous one we handle that after
3279 * the loop to avoid copying the SKB once too much
3287 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3289 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3295 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3298 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3307 * This is the receive path handler. It is called by a low level driver when an
3308 * 802.11 MPDU is received from the hardware.
3310 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3312 struct ieee80211_local *local = hw_to_local(hw);
3313 struct ieee80211_rate *rate = NULL;
3314 struct ieee80211_supported_band *sband;
3315 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3317 WARN_ON_ONCE(softirq_count() == 0);
3319 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3322 sband = local->hw.wiphy->bands[status->band];
3323 if (WARN_ON(!sband))
3327 * If we're suspending, it is possible although not too likely
3328 * that we'd be receiving frames after having already partially
3329 * quiesced the stack. We can't process such frames then since
3330 * that might, for example, cause stations to be added or other
3331 * driver callbacks be invoked.
3333 if (unlikely(local->quiescing || local->suspended))
3336 /* We might be during a HW reconfig, prevent Rx for the same reason */
3337 if (unlikely(local->in_reconfig))
3341 * The same happens when we're not even started,
3342 * but that's worth a warning.
3344 if (WARN_ON(!local->started))
3347 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3349 * Validate the rate, unless a PLCP error means that
3350 * we probably can't have a valid rate here anyway.
3353 if (status->flag & RX_FLAG_HT) {
3355 * rate_idx is MCS index, which can be [0-76]
3358 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3360 * Anything else would be some sort of driver or
3361 * hardware error. The driver should catch hardware
3364 if (WARN(status->rate_idx > 76,
3365 "Rate marked as an HT rate but passed "
3366 "status->rate_idx is not "
3367 "an MCS index [0-76]: %d (0x%02x)\n",
3371 } else if (status->flag & RX_FLAG_VHT) {
3372 if (WARN_ONCE(status->rate_idx > 9 ||
3374 status->vht_nss > 8,
3375 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3376 status->rate_idx, status->vht_nss))
3379 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3381 rate = &sband->bitrates[status->rate_idx];
3385 status->rx_flags = 0;
3388 * key references and virtual interfaces are protected using RCU
3389 * and this requires that we are in a read-side RCU section during
3390 * receive processing
3395 * Frames with failed FCS/PLCP checksum are not returned,
3396 * all other frames are returned without radiotap header
3397 * if it was previously present.
3398 * Also, frames with less than 16 bytes are dropped.
3400 skb = ieee80211_rx_monitor(local, skb, rate);
3406 ieee80211_tpt_led_trig_rx(local,
3407 ((struct ieee80211_hdr *)skb->data)->frame_control,
3409 __ieee80211_rx_handle_packet(hw, skb);
3417 EXPORT_SYMBOL(ieee80211_rx);
3419 /* This is a version of the rx handler that can be called from hard irq
3420 * context. Post the skb on the queue and schedule the tasklet */
3421 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3423 struct ieee80211_local *local = hw_to_local(hw);
3425 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3427 skb->pkt_type = IEEE80211_RX_MSG;
3428 skb_queue_tail(&local->skb_queue, skb);
3429 tasklet_schedule(&local->tasklet);
3431 EXPORT_SYMBOL(ieee80211_rx_irqsafe);