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;
338 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
340 else if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
341 *pos++ = 0; /* marked not known above */
342 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
344 else if (status->flag & RX_FLAG_40MHZ)
349 *pos = (status->rate_idx << 4) | status->vht_nss;
352 if (status->flag & RX_FLAG_LDPC)
353 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
361 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
362 *pos++ = status->chain_signal[chain];
368 * This function copies a received frame to all monitor interfaces and
369 * returns a cleaned-up SKB that no longer includes the FCS nor the
370 * radiotap header the driver might have added.
372 static struct sk_buff *
373 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
374 struct ieee80211_rate *rate)
376 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
377 struct ieee80211_sub_if_data *sdata;
379 struct sk_buff *skb, *skb2;
380 struct net_device *prev_dev = NULL;
381 int present_fcs_len = 0;
384 * First, we may need to make a copy of the skb because
385 * (1) we need to modify it for radiotap (if not present), and
386 * (2) the other RX handlers will modify the skb we got.
388 * We don't need to, of course, if we aren't going to return
389 * the SKB because it has a bad FCS/PLCP checksum.
392 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
393 present_fcs_len = FCS_LEN;
395 /* ensure hdr->frame_control is in skb head */
396 if (!pskb_may_pull(origskb, 2)) {
397 dev_kfree_skb(origskb);
401 if (!local->monitors) {
402 if (should_drop_frame(origskb, present_fcs_len)) {
403 dev_kfree_skb(origskb);
407 return remove_monitor_info(local, origskb);
410 /* room for the radiotap header based on driver features */
411 needed_headroom = ieee80211_rx_radiotap_space(local, status);
413 if (should_drop_frame(origskb, present_fcs_len)) {
414 /* only need to expand headroom if necessary */
419 * This shouldn't trigger often because most devices have an
420 * RX header they pull before we get here, and that should
421 * be big enough for our radiotap information. We should
422 * probably export the length to drivers so that we can have
423 * them allocate enough headroom to start with.
425 if (skb_headroom(skb) < needed_headroom &&
426 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
432 * Need to make a copy and possibly remove radiotap header
433 * and FCS from the original.
435 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
437 origskb = remove_monitor_info(local, origskb);
443 /* prepend radiotap information */
444 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
447 skb_reset_mac_header(skb);
448 skb->ip_summed = CHECKSUM_UNNECESSARY;
449 skb->pkt_type = PACKET_OTHERHOST;
450 skb->protocol = htons(ETH_P_802_2);
452 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
453 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
456 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
459 if (!ieee80211_sdata_running(sdata))
463 skb2 = skb_clone(skb, GFP_ATOMIC);
465 skb2->dev = prev_dev;
466 netif_receive_skb(skb2);
470 prev_dev = sdata->dev;
471 sdata->dev->stats.rx_packets++;
472 sdata->dev->stats.rx_bytes += skb->len;
477 netif_receive_skb(skb);
484 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
486 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
487 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
488 int tid, seqno_idx, security_idx;
490 /* does the frame have a qos control field? */
491 if (ieee80211_is_data_qos(hdr->frame_control)) {
492 u8 *qc = ieee80211_get_qos_ctl(hdr);
493 /* frame has qos control */
494 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
495 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
496 status->rx_flags |= IEEE80211_RX_AMSDU;
502 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
504 * Sequence numbers for management frames, QoS data
505 * frames with a broadcast/multicast address in the
506 * Address 1 field, and all non-QoS data frames sent
507 * by QoS STAs are assigned using an additional single
508 * modulo-4096 counter, [...]
510 * We also use that counter for non-QoS STAs.
512 seqno_idx = IEEE80211_NUM_TIDS;
514 if (ieee80211_is_mgmt(hdr->frame_control))
515 security_idx = IEEE80211_NUM_TIDS;
519 rx->seqno_idx = seqno_idx;
520 rx->security_idx = security_idx;
521 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
522 * For now, set skb->priority to 0 for other cases. */
523 rx->skb->priority = (tid > 7) ? 0 : tid;
527 * DOC: Packet alignment
529 * Drivers always need to pass packets that are aligned to two-byte boundaries
532 * Additionally, should, if possible, align the payload data in a way that
533 * guarantees that the contained IP header is aligned to a four-byte
534 * boundary. In the case of regular frames, this simply means aligning the
535 * payload to a four-byte boundary (because either the IP header is directly
536 * contained, or IV/RFC1042 headers that have a length divisible by four are
537 * in front of it). If the payload data is not properly aligned and the
538 * architecture doesn't support efficient unaligned operations, mac80211
539 * will align the data.
541 * With A-MSDU frames, however, the payload data address must yield two modulo
542 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
543 * push the IP header further back to a multiple of four again. Thankfully, the
544 * specs were sane enough this time around to require padding each A-MSDU
545 * subframe to a length that is a multiple of four.
547 * Padding like Atheros hardware adds which is between the 802.11 header and
548 * the payload is not supported, the driver is required to move the 802.11
549 * header to be directly in front of the payload in that case.
551 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
553 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
554 WARN_ONCE((unsigned long)rx->skb->data & 1,
555 "unaligned packet at 0x%p\n", rx->skb->data);
562 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
564 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
566 if (is_multicast_ether_addr(hdr->addr1))
569 return ieee80211_is_robust_mgmt_frame(skb);
573 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
575 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
577 if (!is_multicast_ether_addr(hdr->addr1))
580 return ieee80211_is_robust_mgmt_frame(skb);
584 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
585 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
587 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
588 struct ieee80211_mmie *mmie;
590 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
593 if (!ieee80211_is_robust_mgmt_frame(skb))
594 return -1; /* not a robust management frame */
596 mmie = (struct ieee80211_mmie *)
597 (skb->data + skb->len - sizeof(*mmie));
598 if (mmie->element_id != WLAN_EID_MMIE ||
599 mmie->length != sizeof(*mmie) - 2)
602 return le16_to_cpu(mmie->key_id);
605 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
608 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
613 fc = hdr->frame_control;
614 hdrlen = ieee80211_hdrlen(fc);
616 if (skb->len < hdrlen + cs->hdr_len)
619 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
620 keyid &= cs->key_idx_mask;
621 keyid >>= cs->key_idx_shift;
626 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
628 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
629 char *dev_addr = rx->sdata->vif.addr;
631 if (ieee80211_is_data(hdr->frame_control)) {
632 if (is_multicast_ether_addr(hdr->addr1)) {
633 if (ieee80211_has_tods(hdr->frame_control) ||
634 !ieee80211_has_fromds(hdr->frame_control))
635 return RX_DROP_MONITOR;
636 if (ether_addr_equal(hdr->addr3, dev_addr))
637 return RX_DROP_MONITOR;
639 if (!ieee80211_has_a4(hdr->frame_control))
640 return RX_DROP_MONITOR;
641 if (ether_addr_equal(hdr->addr4, dev_addr))
642 return RX_DROP_MONITOR;
646 /* If there is not an established peer link and this is not a peer link
647 * establisment frame, beacon or probe, drop the frame.
650 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
651 struct ieee80211_mgmt *mgmt;
653 if (!ieee80211_is_mgmt(hdr->frame_control))
654 return RX_DROP_MONITOR;
656 if (ieee80211_is_action(hdr->frame_control)) {
659 /* make sure category field is present */
660 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
661 return RX_DROP_MONITOR;
663 mgmt = (struct ieee80211_mgmt *)hdr;
664 category = mgmt->u.action.category;
665 if (category != WLAN_CATEGORY_MESH_ACTION &&
666 category != WLAN_CATEGORY_SELF_PROTECTED)
667 return RX_DROP_MONITOR;
671 if (ieee80211_is_probe_req(hdr->frame_control) ||
672 ieee80211_is_probe_resp(hdr->frame_control) ||
673 ieee80211_is_beacon(hdr->frame_control) ||
674 ieee80211_is_auth(hdr->frame_control))
677 return RX_DROP_MONITOR;
683 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
684 struct tid_ampdu_rx *tid_agg_rx,
686 struct sk_buff_head *frames)
688 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
689 struct ieee80211_rx_status *status;
691 lockdep_assert_held(&tid_agg_rx->reorder_lock);
696 /* release the frame from the reorder ring buffer */
697 tid_agg_rx->stored_mpdu_num--;
698 tid_agg_rx->reorder_buf[index] = NULL;
699 status = IEEE80211_SKB_RXCB(skb);
700 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
701 __skb_queue_tail(frames, skb);
704 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
707 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
708 struct tid_ampdu_rx *tid_agg_rx,
710 struct sk_buff_head *frames)
714 lockdep_assert_held(&tid_agg_rx->reorder_lock);
716 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
717 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
718 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
724 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
725 * the skb was added to the buffer longer than this time ago, the earlier
726 * frames that have not yet been received are assumed to be lost and the skb
727 * can be released for processing. This may also release other skb's from the
728 * reorder buffer if there are no additional gaps between the frames.
730 * Callers must hold tid_agg_rx->reorder_lock.
732 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
734 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
735 struct tid_ampdu_rx *tid_agg_rx,
736 struct sk_buff_head *frames)
740 lockdep_assert_held(&tid_agg_rx->reorder_lock);
742 /* release the buffer until next missing frame */
743 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
744 if (!tid_agg_rx->reorder_buf[index] &&
745 tid_agg_rx->stored_mpdu_num) {
747 * No buffers ready to be released, but check whether any
748 * frames in the reorder buffer have timed out.
751 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
752 j = (j + 1) % tid_agg_rx->buf_size) {
753 if (!tid_agg_rx->reorder_buf[j]) {
758 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
759 HT_RX_REORDER_BUF_TIMEOUT))
760 goto set_release_timer;
762 ht_dbg_ratelimited(sdata,
763 "release an RX reorder frame due to timeout on earlier frames\n");
764 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
768 * Increment the head seq# also for the skipped slots.
770 tid_agg_rx->head_seq_num =
771 (tid_agg_rx->head_seq_num +
772 skipped) & IEEE80211_SN_MASK;
775 } else while (tid_agg_rx->reorder_buf[index]) {
776 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
778 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
781 if (tid_agg_rx->stored_mpdu_num) {
782 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
784 for (; j != (index - 1) % tid_agg_rx->buf_size;
785 j = (j + 1) % tid_agg_rx->buf_size) {
786 if (tid_agg_rx->reorder_buf[j])
792 mod_timer(&tid_agg_rx->reorder_timer,
793 tid_agg_rx->reorder_time[j] + 1 +
794 HT_RX_REORDER_BUF_TIMEOUT);
796 del_timer(&tid_agg_rx->reorder_timer);
801 * As this function belongs to the RX path it must be under
802 * rcu_read_lock protection. It returns false if the frame
803 * can be processed immediately, true if it was consumed.
805 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
806 struct tid_ampdu_rx *tid_agg_rx,
808 struct sk_buff_head *frames)
810 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
811 u16 sc = le16_to_cpu(hdr->seq_ctrl);
812 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
813 u16 head_seq_num, buf_size;
817 spin_lock(&tid_agg_rx->reorder_lock);
819 buf_size = tid_agg_rx->buf_size;
820 head_seq_num = tid_agg_rx->head_seq_num;
822 /* frame with out of date sequence number */
823 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
829 * If frame the sequence number exceeds our buffering window
830 * size release some previous frames to make room for this one.
832 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
833 head_seq_num = ieee80211_sn_inc(
834 ieee80211_sn_sub(mpdu_seq_num, buf_size));
835 /* release stored frames up to new head to stack */
836 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
837 head_seq_num, frames);
840 /* Now the new frame is always in the range of the reordering buffer */
842 index = mpdu_seq_num % tid_agg_rx->buf_size;
844 /* check if we already stored this frame */
845 if (tid_agg_rx->reorder_buf[index]) {
851 * If the current MPDU is in the right order and nothing else
852 * is stored we can process it directly, no need to buffer it.
853 * If it is first but there's something stored, we may be able
854 * to release frames after this one.
856 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
857 tid_agg_rx->stored_mpdu_num == 0) {
858 tid_agg_rx->head_seq_num =
859 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
864 /* put the frame in the reordering buffer */
865 tid_agg_rx->reorder_buf[index] = skb;
866 tid_agg_rx->reorder_time[index] = jiffies;
867 tid_agg_rx->stored_mpdu_num++;
868 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
871 spin_unlock(&tid_agg_rx->reorder_lock);
876 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
877 * true if the MPDU was buffered, false if it should be processed.
879 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
880 struct sk_buff_head *frames)
882 struct sk_buff *skb = rx->skb;
883 struct ieee80211_local *local = rx->local;
884 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
885 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
886 struct sta_info *sta = rx->sta;
887 struct tid_ampdu_rx *tid_agg_rx;
891 if (!ieee80211_is_data_qos(hdr->frame_control) ||
892 is_multicast_ether_addr(hdr->addr1))
896 * filter the QoS data rx stream according to
897 * STA/TID and check if this STA/TID is on aggregation
903 ack_policy = *ieee80211_get_qos_ctl(hdr) &
904 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
905 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
907 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
911 /* qos null data frames are excluded */
912 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
915 /* not part of a BA session */
916 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
917 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
920 /* not actually part of this BA session */
921 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
924 /* new, potentially un-ordered, ampdu frame - process it */
926 /* reset session timer */
927 if (tid_agg_rx->timeout)
928 tid_agg_rx->last_rx = jiffies;
930 /* if this mpdu is fragmented - terminate rx aggregation session */
931 sc = le16_to_cpu(hdr->seq_ctrl);
932 if (sc & IEEE80211_SCTL_FRAG) {
933 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
934 skb_queue_tail(&rx->sdata->skb_queue, skb);
935 ieee80211_queue_work(&local->hw, &rx->sdata->work);
940 * No locking needed -- we will only ever process one
941 * RX packet at a time, and thus own tid_agg_rx. All
942 * other code manipulating it needs to (and does) make
943 * sure that we cannot get to it any more before doing
946 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
951 __skb_queue_tail(frames, skb);
954 static ieee80211_rx_result debug_noinline
955 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
957 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
958 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
961 * Drop duplicate 802.11 retransmissions
962 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
964 if (rx->skb->len >= 24 && rx->sta &&
965 !ieee80211_is_ctl(hdr->frame_control) &&
966 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
967 !is_multicast_ether_addr(hdr->addr1)) {
968 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
969 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
971 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
972 rx->local->dot11FrameDuplicateCount++;
973 rx->sta->num_duplicates++;
975 return RX_DROP_UNUSABLE;
976 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
977 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
981 if (unlikely(rx->skb->len < 16)) {
982 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
983 return RX_DROP_MONITOR;
986 /* Drop disallowed frame classes based on STA auth/assoc state;
987 * IEEE 802.11, Chap 5.5.
989 * mac80211 filters only based on association state, i.e. it drops
990 * Class 3 frames from not associated stations. hostapd sends
991 * deauth/disassoc frames when needed. In addition, hostapd is
992 * responsible for filtering on both auth and assoc states.
995 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
996 return ieee80211_rx_mesh_check(rx);
998 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
999 ieee80211_is_pspoll(hdr->frame_control)) &&
1000 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1001 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1002 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1004 * accept port control frames from the AP even when it's not
1005 * yet marked ASSOC to prevent a race where we don't set the
1006 * assoc bit quickly enough before it sends the first frame
1008 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1009 ieee80211_is_data_present(hdr->frame_control)) {
1010 unsigned int hdrlen;
1013 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1015 if (rx->skb->len < hdrlen + 8)
1016 return RX_DROP_MONITOR;
1018 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1019 if (ethertype == rx->sdata->control_port_protocol)
1023 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1024 cfg80211_rx_spurious_frame(rx->sdata->dev,
1027 return RX_DROP_UNUSABLE;
1029 return RX_DROP_MONITOR;
1036 static ieee80211_rx_result debug_noinline
1037 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1039 struct ieee80211_local *local;
1040 struct ieee80211_hdr *hdr;
1041 struct sk_buff *skb;
1045 hdr = (struct ieee80211_hdr *) skb->data;
1047 if (!local->pspolling)
1050 if (!ieee80211_has_fromds(hdr->frame_control))
1051 /* this is not from AP */
1054 if (!ieee80211_is_data(hdr->frame_control))
1057 if (!ieee80211_has_moredata(hdr->frame_control)) {
1058 /* AP has no more frames buffered for us */
1059 local->pspolling = false;
1063 /* more data bit is set, let's request a new frame from the AP */
1064 ieee80211_send_pspoll(local, rx->sdata);
1069 static void sta_ps_start(struct sta_info *sta)
1071 struct ieee80211_sub_if_data *sdata = sta->sdata;
1072 struct ieee80211_local *local = sdata->local;
1075 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1076 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1077 ps = &sdata->bss->ps;
1081 atomic_inc(&ps->num_sta_ps);
1082 set_sta_flag(sta, WLAN_STA_PS_STA);
1083 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1084 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1085 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1086 sta->sta.addr, sta->sta.aid);
1089 static void sta_ps_end(struct sta_info *sta)
1091 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1092 sta->sta.addr, sta->sta.aid);
1094 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1096 * Clear the flag only if the other one is still set
1097 * so that the TX path won't start TX'ing new frames
1098 * directly ... In the case that the driver flag isn't
1099 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1101 clear_sta_flag(sta, WLAN_STA_PS_STA);
1102 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1103 sta->sta.addr, sta->sta.aid);
1107 ieee80211_sta_ps_deliver_wakeup(sta);
1110 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1112 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1115 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1117 /* Don't let the same PS state be set twice */
1118 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1119 if ((start && in_ps) || (!start && !in_ps))
1123 sta_ps_start(sta_inf);
1125 sta_ps_end(sta_inf);
1129 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1131 static ieee80211_rx_result debug_noinline
1132 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1134 struct ieee80211_sub_if_data *sdata = rx->sdata;
1135 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1136 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1139 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1142 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1143 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1147 * The device handles station powersave, so don't do anything about
1148 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1149 * it to mac80211 since they're handled.)
1151 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1155 * Don't do anything if the station isn't already asleep. In
1156 * the uAPSD case, the station will probably be marked asleep,
1157 * in the PS-Poll case the station must be confused ...
1159 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1162 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1163 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1164 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1165 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1167 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1170 /* Free PS Poll skb here instead of returning RX_DROP that would
1171 * count as an dropped frame. */
1172 dev_kfree_skb(rx->skb);
1175 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1176 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1177 ieee80211_has_pm(hdr->frame_control) &&
1178 (ieee80211_is_data_qos(hdr->frame_control) ||
1179 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1180 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1181 ac = ieee802_1d_to_ac[tid & 7];
1184 * If this AC is not trigger-enabled do nothing.
1186 * NB: This could/should check a separate bitmap of trigger-
1187 * enabled queues, but for now we only implement uAPSD w/o
1188 * TSPEC changes to the ACs, so they're always the same.
1190 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1193 /* if we are in a service period, do nothing */
1194 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1197 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1198 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1200 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1206 static ieee80211_rx_result debug_noinline
1207 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1209 struct sta_info *sta = rx->sta;
1210 struct sk_buff *skb = rx->skb;
1211 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1212 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1219 * Update last_rx only for IBSS packets which are for the current
1220 * BSSID and for station already AUTHORIZED to avoid keeping the
1221 * current IBSS network alive in cases where other STAs start
1222 * using different BSSID. This will also give the station another
1223 * chance to restart the authentication/authorization in case
1224 * something went wrong the first time.
1226 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1227 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1228 NL80211_IFTYPE_ADHOC);
1229 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1230 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1231 sta->last_rx = jiffies;
1232 if (ieee80211_is_data(hdr->frame_control)) {
1233 sta->last_rx_rate_idx = status->rate_idx;
1234 sta->last_rx_rate_flag = status->flag;
1235 sta->last_rx_rate_vht_flag = status->vht_flag;
1236 sta->last_rx_rate_vht_nss = status->vht_nss;
1239 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1241 * Mesh beacons will update last_rx when if they are found to
1242 * match the current local configuration when processed.
1244 sta->last_rx = jiffies;
1245 if (ieee80211_is_data(hdr->frame_control)) {
1246 sta->last_rx_rate_idx = status->rate_idx;
1247 sta->last_rx_rate_flag = status->flag;
1248 sta->last_rx_rate_vht_nss = status->vht_nss;
1252 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1255 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1256 ieee80211_sta_rx_notify(rx->sdata, hdr);
1258 sta->rx_fragments++;
1259 sta->rx_bytes += rx->skb->len;
1260 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1261 sta->last_signal = status->signal;
1262 ewma_add(&sta->avg_signal, -status->signal);
1265 if (status->chains) {
1266 sta->chains = status->chains;
1267 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1268 int signal = status->chain_signal[i];
1270 if (!(status->chains & BIT(i)))
1273 sta->chain_signal_last[i] = signal;
1274 ewma_add(&sta->chain_signal_avg[i], -signal);
1279 * Change STA power saving mode only at the end of a frame
1280 * exchange sequence.
1282 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1283 !ieee80211_has_morefrags(hdr->frame_control) &&
1284 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1285 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1286 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1287 /* PM bit is only checked in frames where it isn't reserved,
1288 * in AP mode it's reserved in non-bufferable management frames
1289 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1291 (!ieee80211_is_mgmt(hdr->frame_control) ||
1292 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1293 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1294 if (!ieee80211_has_pm(hdr->frame_control))
1297 if (ieee80211_has_pm(hdr->frame_control))
1302 /* mesh power save support */
1303 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1304 ieee80211_mps_rx_h_sta_process(sta, hdr);
1307 * Drop (qos-)data::nullfunc frames silently, since they
1308 * are used only to control station power saving mode.
1310 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1311 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1312 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1315 * If we receive a 4-addr nullfunc frame from a STA
1316 * that was not moved to a 4-addr STA vlan yet send
1317 * the event to userspace and for older hostapd drop
1318 * the frame to the monitor interface.
1320 if (ieee80211_has_a4(hdr->frame_control) &&
1321 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1322 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1323 !rx->sdata->u.vlan.sta))) {
1324 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1325 cfg80211_rx_unexpected_4addr_frame(
1326 rx->sdata->dev, sta->sta.addr,
1328 return RX_DROP_MONITOR;
1331 * Update counter and free packet here to avoid
1332 * counting this as a dropped packed.
1335 dev_kfree_skb(rx->skb);
1340 } /* ieee80211_rx_h_sta_process */
1342 static ieee80211_rx_result debug_noinline
1343 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1345 struct sk_buff *skb = rx->skb;
1346 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1347 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1350 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1351 struct ieee80211_key *sta_ptk = NULL;
1352 int mmie_keyidx = -1;
1354 const struct ieee80211_cipher_scheme *cs = NULL;
1359 * There are four types of keys:
1360 * - GTK (group keys)
1361 * - IGTK (group keys for management frames)
1362 * - PTK (pairwise keys)
1363 * - STK (station-to-station pairwise keys)
1365 * When selecting a key, we have to distinguish between multicast
1366 * (including broadcast) and unicast frames, the latter can only
1367 * use PTKs and STKs while the former always use GTKs and IGTKs.
1368 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1369 * unicast frames can also use key indices like GTKs. Hence, if we
1370 * don't have a PTK/STK we check the key index for a WEP key.
1372 * Note that in a regular BSS, multicast frames are sent by the
1373 * AP only, associated stations unicast the frame to the AP first
1374 * which then multicasts it on their behalf.
1376 * There is also a slight problem in IBSS mode: GTKs are negotiated
1377 * with each station, that is something we don't currently handle.
1378 * The spec seems to expect that one negotiates the same key with
1379 * every station but there's no such requirement; VLANs could be
1384 * No point in finding a key and decrypting if the frame is neither
1385 * addressed to us nor a multicast frame.
1387 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1390 /* start without a key */
1392 fc = hdr->frame_control;
1395 int keyid = rx->sta->ptk_idx;
1397 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1398 cs = rx->sta->cipher_scheme;
1399 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1400 if (unlikely(keyid < 0))
1401 return RX_DROP_UNUSABLE;
1403 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1406 if (!ieee80211_has_protected(fc))
1407 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1409 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1411 if ((status->flag & RX_FLAG_DECRYPTED) &&
1412 (status->flag & RX_FLAG_IV_STRIPPED))
1414 /* Skip decryption if the frame is not protected. */
1415 if (!ieee80211_has_protected(fc))
1417 } else if (mmie_keyidx >= 0) {
1418 /* Broadcast/multicast robust management frame / BIP */
1419 if ((status->flag & RX_FLAG_DECRYPTED) &&
1420 (status->flag & RX_FLAG_IV_STRIPPED))
1423 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1424 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1425 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1427 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1429 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1430 } else if (!ieee80211_has_protected(fc)) {
1432 * The frame was not protected, so skip decryption. However, we
1433 * need to set rx->key if there is a key that could have been
1434 * used so that the frame may be dropped if encryption would
1435 * have been expected.
1437 struct ieee80211_key *key = NULL;
1438 struct ieee80211_sub_if_data *sdata = rx->sdata;
1441 if (ieee80211_is_mgmt(fc) &&
1442 is_multicast_ether_addr(hdr->addr1) &&
1443 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1447 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1448 key = rcu_dereference(rx->sta->gtk[i]);
1454 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1455 key = rcu_dereference(sdata->keys[i]);
1468 * The device doesn't give us the IV so we won't be
1469 * able to look up the key. That's ok though, we
1470 * don't need to decrypt the frame, we just won't
1471 * be able to keep statistics accurate.
1472 * Except for key threshold notifications, should
1473 * we somehow allow the driver to tell us which key
1474 * the hardware used if this flag is set?
1476 if ((status->flag & RX_FLAG_DECRYPTED) &&
1477 (status->flag & RX_FLAG_IV_STRIPPED))
1480 hdrlen = ieee80211_hdrlen(fc);
1483 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1485 if (unlikely(keyidx < 0))
1486 return RX_DROP_UNUSABLE;
1488 if (rx->skb->len < 8 + hdrlen)
1489 return RX_DROP_UNUSABLE; /* TODO: count this? */
1491 * no need to call ieee80211_wep_get_keyidx,
1492 * it verifies a bunch of things we've done already
1494 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1495 keyidx = keyid >> 6;
1498 /* check per-station GTK first, if multicast packet */
1499 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1500 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1502 /* if not found, try default key */
1504 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1507 * RSNA-protected unicast frames should always be
1508 * sent with pairwise or station-to-station keys,
1509 * but for WEP we allow using a key index as well.
1512 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1513 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1514 !is_multicast_ether_addr(hdr->addr1))
1520 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1521 return RX_DROP_MONITOR;
1523 rx->key->tx_rx_count++;
1524 /* TODO: add threshold stuff again */
1526 return RX_DROP_MONITOR;
1529 switch (rx->key->conf.cipher) {
1530 case WLAN_CIPHER_SUITE_WEP40:
1531 case WLAN_CIPHER_SUITE_WEP104:
1532 result = ieee80211_crypto_wep_decrypt(rx);
1534 case WLAN_CIPHER_SUITE_TKIP:
1535 result = ieee80211_crypto_tkip_decrypt(rx);
1537 case WLAN_CIPHER_SUITE_CCMP:
1538 result = ieee80211_crypto_ccmp_decrypt(rx);
1540 case WLAN_CIPHER_SUITE_AES_CMAC:
1541 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1544 result = ieee80211_crypto_hw_decrypt(rx);
1547 /* the hdr variable is invalid after the decrypt handlers */
1549 /* either the frame has been decrypted or will be dropped */
1550 status->flag |= RX_FLAG_DECRYPTED;
1555 static inline struct ieee80211_fragment_entry *
1556 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1557 unsigned int frag, unsigned int seq, int rx_queue,
1558 struct sk_buff **skb)
1560 struct ieee80211_fragment_entry *entry;
1562 entry = &sdata->fragments[sdata->fragment_next++];
1563 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1564 sdata->fragment_next = 0;
1566 if (!skb_queue_empty(&entry->skb_list))
1567 __skb_queue_purge(&entry->skb_list);
1569 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1571 entry->first_frag_time = jiffies;
1573 entry->rx_queue = rx_queue;
1574 entry->last_frag = frag;
1576 entry->extra_len = 0;
1581 static inline struct ieee80211_fragment_entry *
1582 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1583 unsigned int frag, unsigned int seq,
1584 int rx_queue, struct ieee80211_hdr *hdr)
1586 struct ieee80211_fragment_entry *entry;
1589 idx = sdata->fragment_next;
1590 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1591 struct ieee80211_hdr *f_hdr;
1595 idx = IEEE80211_FRAGMENT_MAX - 1;
1597 entry = &sdata->fragments[idx];
1598 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1599 entry->rx_queue != rx_queue ||
1600 entry->last_frag + 1 != frag)
1603 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1606 * Check ftype and addresses are equal, else check next fragment
1608 if (((hdr->frame_control ^ f_hdr->frame_control) &
1609 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1610 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1611 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1614 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1615 __skb_queue_purge(&entry->skb_list);
1624 static ieee80211_rx_result debug_noinline
1625 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1627 struct ieee80211_hdr *hdr;
1630 unsigned int frag, seq;
1631 struct ieee80211_fragment_entry *entry;
1632 struct sk_buff *skb;
1633 struct ieee80211_rx_status *status;
1635 hdr = (struct ieee80211_hdr *)rx->skb->data;
1636 fc = hdr->frame_control;
1638 if (ieee80211_is_ctl(fc))
1641 sc = le16_to_cpu(hdr->seq_ctrl);
1642 frag = sc & IEEE80211_SCTL_FRAG;
1644 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1645 is_multicast_ether_addr(hdr->addr1))) {
1646 /* not fragmented */
1649 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1651 if (skb_linearize(rx->skb))
1652 return RX_DROP_UNUSABLE;
1655 * skb_linearize() might change the skb->data and
1656 * previously cached variables (in this case, hdr) need to
1657 * be refreshed with the new data.
1659 hdr = (struct ieee80211_hdr *)rx->skb->data;
1660 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1663 /* This is the first fragment of a new frame. */
1664 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1665 rx->seqno_idx, &(rx->skb));
1666 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1667 ieee80211_has_protected(fc)) {
1668 int queue = rx->security_idx;
1669 /* Store CCMP PN so that we can verify that the next
1670 * fragment has a sequential PN value. */
1672 memcpy(entry->last_pn,
1673 rx->key->u.ccmp.rx_pn[queue],
1674 IEEE80211_CCMP_PN_LEN);
1679 /* This is a fragment for a frame that should already be pending in
1680 * fragment cache. Add this fragment to the end of the pending entry.
1682 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1683 rx->seqno_idx, hdr);
1685 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1686 return RX_DROP_MONITOR;
1689 /* Verify that MPDUs within one MSDU have sequential PN values.
1690 * (IEEE 802.11i, 8.3.3.4.5) */
1693 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1695 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1696 return RX_DROP_UNUSABLE;
1697 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1698 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1703 queue = rx->security_idx;
1704 rpn = rx->key->u.ccmp.rx_pn[queue];
1705 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1706 return RX_DROP_UNUSABLE;
1707 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1710 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1711 __skb_queue_tail(&entry->skb_list, rx->skb);
1712 entry->last_frag = frag;
1713 entry->extra_len += rx->skb->len;
1714 if (ieee80211_has_morefrags(fc)) {
1719 rx->skb = __skb_dequeue(&entry->skb_list);
1720 if (skb_tailroom(rx->skb) < entry->extra_len) {
1721 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1722 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1724 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1725 __skb_queue_purge(&entry->skb_list);
1726 return RX_DROP_UNUSABLE;
1729 while ((skb = __skb_dequeue(&entry->skb_list))) {
1730 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1734 /* Complete frame has been reassembled - process it now */
1735 status = IEEE80211_SKB_RXCB(rx->skb);
1736 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1740 rx->sta->rx_packets++;
1741 if (is_multicast_ether_addr(hdr->addr1))
1742 rx->local->dot11MulticastReceivedFrameCount++;
1744 ieee80211_led_rx(rx->local);
1748 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1750 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1756 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1758 struct sk_buff *skb = rx->skb;
1759 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1762 * Pass through unencrypted frames if the hardware has
1763 * decrypted them already.
1765 if (status->flag & RX_FLAG_DECRYPTED)
1768 /* Drop unencrypted frames if key is set. */
1769 if (unlikely(!ieee80211_has_protected(fc) &&
1770 !ieee80211_is_nullfunc(fc) &&
1771 ieee80211_is_data(fc) &&
1772 (rx->key || rx->sdata->drop_unencrypted)))
1778 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1780 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1781 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1782 __le16 fc = hdr->frame_control;
1785 * Pass through unencrypted frames if the hardware has
1786 * decrypted them already.
1788 if (status->flag & RX_FLAG_DECRYPTED)
1791 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1792 if (unlikely(!ieee80211_has_protected(fc) &&
1793 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1795 if (ieee80211_is_deauth(fc) ||
1796 ieee80211_is_disassoc(fc))
1797 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1802 /* BIP does not use Protected field, so need to check MMIE */
1803 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1804 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1805 if (ieee80211_is_deauth(fc) ||
1806 ieee80211_is_disassoc(fc))
1807 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1813 * When using MFP, Action frames are not allowed prior to
1814 * having configured keys.
1816 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1817 ieee80211_is_robust_mgmt_frame(rx->skb)))
1825 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1827 struct ieee80211_sub_if_data *sdata = rx->sdata;
1828 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1829 bool check_port_control = false;
1830 struct ethhdr *ehdr;
1833 *port_control = false;
1834 if (ieee80211_has_a4(hdr->frame_control) &&
1835 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1838 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1839 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1841 if (!sdata->u.mgd.use_4addr)
1844 check_port_control = true;
1847 if (is_multicast_ether_addr(hdr->addr1) &&
1848 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1851 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1855 ehdr = (struct ethhdr *) rx->skb->data;
1856 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1857 *port_control = true;
1858 else if (check_port_control)
1865 * requires that rx->skb is a frame with ethernet header
1867 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1869 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1870 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1871 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1874 * Allow EAPOL frames to us/the PAE group address regardless
1875 * of whether the frame was encrypted or not.
1877 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1878 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1879 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1882 if (ieee80211_802_1x_port_control(rx) ||
1883 ieee80211_drop_unencrypted(rx, fc))
1890 * requires that rx->skb is a frame with ethernet header
1893 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1895 struct ieee80211_sub_if_data *sdata = rx->sdata;
1896 struct net_device *dev = sdata->dev;
1897 struct sk_buff *skb, *xmit_skb;
1898 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1899 struct sta_info *dsta;
1900 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1905 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1906 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1907 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1908 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1909 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1910 if (is_multicast_ether_addr(ehdr->h_dest)) {
1912 * send multicast frames both to higher layers in
1913 * local net stack and back to the wireless medium
1915 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1917 net_info_ratelimited("%s: failed to clone multicast frame\n",
1920 dsta = sta_info_get(sdata, skb->data);
1923 * The destination station is associated to
1924 * this AP (in this VLAN), so send the frame
1925 * directly to it and do not pass it to local
1934 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1936 /* 'align' will only take the values 0 or 2 here since all
1937 * frames are required to be aligned to 2-byte boundaries
1938 * when being passed to mac80211; the code here works just
1939 * as well if that isn't true, but mac80211 assumes it can
1940 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1944 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
1946 if (WARN_ON(skb_headroom(skb) < 3)) {
1950 u8 *data = skb->data;
1951 size_t len = skb_headlen(skb);
1953 memmove(skb->data, data, len);
1954 skb_set_tail_pointer(skb, len);
1961 /* deliver to local stack */
1962 skb->protocol = eth_type_trans(skb, dev);
1963 memset(skb->cb, 0, sizeof(skb->cb));
1964 if (rx->local->napi)
1965 napi_gro_receive(rx->local->napi, skb);
1967 netif_receive_skb(skb);
1972 * Send to wireless media and increase priority by 256 to
1973 * keep the received priority instead of reclassifying
1974 * the frame (see cfg80211_classify8021d).
1976 xmit_skb->priority += 256;
1977 xmit_skb->protocol = htons(ETH_P_802_3);
1978 skb_reset_network_header(xmit_skb);
1979 skb_reset_mac_header(xmit_skb);
1980 dev_queue_xmit(xmit_skb);
1984 static ieee80211_rx_result debug_noinline
1985 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1987 struct net_device *dev = rx->sdata->dev;
1988 struct sk_buff *skb = rx->skb;
1989 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1990 __le16 fc = hdr->frame_control;
1991 struct sk_buff_head frame_list;
1992 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1994 if (unlikely(!ieee80211_is_data(fc)))
1997 if (unlikely(!ieee80211_is_data_present(fc)))
1998 return RX_DROP_MONITOR;
2000 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2003 if (ieee80211_has_a4(hdr->frame_control) &&
2004 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2005 !rx->sdata->u.vlan.sta)
2006 return RX_DROP_UNUSABLE;
2008 if (is_multicast_ether_addr(hdr->addr1) &&
2009 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2010 rx->sdata->u.vlan.sta) ||
2011 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2012 rx->sdata->u.mgd.use_4addr)))
2013 return RX_DROP_UNUSABLE;
2016 __skb_queue_head_init(&frame_list);
2018 if (skb_linearize(skb))
2019 return RX_DROP_UNUSABLE;
2021 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2022 rx->sdata->vif.type,
2023 rx->local->hw.extra_tx_headroom, true);
2025 while (!skb_queue_empty(&frame_list)) {
2026 rx->skb = __skb_dequeue(&frame_list);
2028 if (!ieee80211_frame_allowed(rx, fc)) {
2029 dev_kfree_skb(rx->skb);
2032 dev->stats.rx_packets++;
2033 dev->stats.rx_bytes += rx->skb->len;
2035 ieee80211_deliver_skb(rx);
2041 #ifdef CONFIG_MAC80211_MESH
2042 static ieee80211_rx_result
2043 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2045 struct ieee80211_hdr *fwd_hdr, *hdr;
2046 struct ieee80211_tx_info *info;
2047 struct ieee80211s_hdr *mesh_hdr;
2048 struct sk_buff *skb = rx->skb, *fwd_skb;
2049 struct ieee80211_local *local = rx->local;
2050 struct ieee80211_sub_if_data *sdata = rx->sdata;
2051 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2052 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2055 hdr = (struct ieee80211_hdr *) skb->data;
2056 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2058 /* make sure fixed part of mesh header is there, also checks skb len */
2059 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2060 return RX_DROP_MONITOR;
2062 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2064 /* make sure full mesh header is there, also checks skb len */
2065 if (!pskb_may_pull(rx->skb,
2066 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2067 return RX_DROP_MONITOR;
2069 /* reload pointers */
2070 hdr = (struct ieee80211_hdr *) skb->data;
2071 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2073 /* frame is in RMC, don't forward */
2074 if (ieee80211_is_data(hdr->frame_control) &&
2075 is_multicast_ether_addr(hdr->addr1) &&
2076 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2077 return RX_DROP_MONITOR;
2079 if (!ieee80211_is_data(hdr->frame_control) ||
2080 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2084 return RX_DROP_MONITOR;
2086 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2087 struct mesh_path *mppath;
2091 if (is_multicast_ether_addr(hdr->addr1)) {
2092 mpp_addr = hdr->addr3;
2093 proxied_addr = mesh_hdr->eaddr1;
2094 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2095 /* has_a4 already checked in ieee80211_rx_mesh_check */
2096 mpp_addr = hdr->addr4;
2097 proxied_addr = mesh_hdr->eaddr2;
2099 return RX_DROP_MONITOR;
2103 mppath = mpp_path_lookup(sdata, proxied_addr);
2105 mpp_path_add(sdata, proxied_addr, mpp_addr);
2107 spin_lock_bh(&mppath->state_lock);
2108 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2109 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2110 spin_unlock_bh(&mppath->state_lock);
2115 /* Frame has reached destination. Don't forward */
2116 if (!is_multicast_ether_addr(hdr->addr1) &&
2117 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2120 q = ieee80211_select_queue_80211(sdata, skb, hdr);
2121 if (ieee80211_queue_stopped(&local->hw, q)) {
2122 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2123 return RX_DROP_MONITOR;
2125 skb_set_queue_mapping(skb, q);
2127 if (!--mesh_hdr->ttl) {
2128 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2132 if (!ifmsh->mshcfg.dot11MeshForwarding)
2135 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2137 net_info_ratelimited("%s: failed to clone mesh frame\n",
2142 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2143 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2144 info = IEEE80211_SKB_CB(fwd_skb);
2145 memset(info, 0, sizeof(*info));
2146 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2147 info->control.vif = &rx->sdata->vif;
2148 info->control.jiffies = jiffies;
2149 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2150 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2151 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2152 /* update power mode indication when forwarding */
2153 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2154 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2155 /* mesh power mode flags updated in mesh_nexthop_lookup */
2156 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2158 /* unable to resolve next hop */
2159 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2161 WLAN_REASON_MESH_PATH_NOFORWARD,
2163 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2165 return RX_DROP_MONITOR;
2168 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2169 ieee80211_add_pending_skb(local, fwd_skb);
2171 if (is_multicast_ether_addr(hdr->addr1) ||
2172 sdata->dev->flags & IFF_PROMISC)
2175 return RX_DROP_MONITOR;
2179 static ieee80211_rx_result debug_noinline
2180 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2182 struct ieee80211_sub_if_data *sdata = rx->sdata;
2183 struct ieee80211_local *local = rx->local;
2184 struct net_device *dev = sdata->dev;
2185 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2186 __le16 fc = hdr->frame_control;
2190 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2193 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2194 return RX_DROP_MONITOR;
2197 * Send unexpected-4addr-frame event to hostapd. For older versions,
2198 * also drop the frame to cooked monitor interfaces.
2200 if (ieee80211_has_a4(hdr->frame_control) &&
2201 sdata->vif.type == NL80211_IFTYPE_AP) {
2203 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2204 cfg80211_rx_unexpected_4addr_frame(
2205 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2206 return RX_DROP_MONITOR;
2209 err = __ieee80211_data_to_8023(rx, &port_control);
2211 return RX_DROP_UNUSABLE;
2213 if (!ieee80211_frame_allowed(rx, fc))
2214 return RX_DROP_MONITOR;
2216 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2217 unlikely(port_control) && sdata->bss) {
2218 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2226 dev->stats.rx_packets++;
2227 dev->stats.rx_bytes += rx->skb->len;
2229 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2230 !is_multicast_ether_addr(
2231 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2232 (!local->scanning &&
2233 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2234 mod_timer(&local->dynamic_ps_timer, jiffies +
2235 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2238 ieee80211_deliver_skb(rx);
2243 static ieee80211_rx_result debug_noinline
2244 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2246 struct sk_buff *skb = rx->skb;
2247 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2248 struct tid_ampdu_rx *tid_agg_rx;
2252 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2255 if (ieee80211_is_back_req(bar->frame_control)) {
2257 __le16 control, start_seq_num;
2258 } __packed bar_data;
2261 return RX_DROP_MONITOR;
2263 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2264 &bar_data, sizeof(bar_data)))
2265 return RX_DROP_MONITOR;
2267 tid = le16_to_cpu(bar_data.control) >> 12;
2269 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2271 return RX_DROP_MONITOR;
2273 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2275 /* reset session timer */
2276 if (tid_agg_rx->timeout)
2277 mod_timer(&tid_agg_rx->session_timer,
2278 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2280 spin_lock(&tid_agg_rx->reorder_lock);
2281 /* release stored frames up to start of BAR */
2282 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2283 start_seq_num, frames);
2284 spin_unlock(&tid_agg_rx->reorder_lock);
2291 * After this point, we only want management frames,
2292 * so we can drop all remaining control frames to
2293 * cooked monitor interfaces.
2295 return RX_DROP_MONITOR;
2298 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2299 struct ieee80211_mgmt *mgmt,
2302 struct ieee80211_local *local = sdata->local;
2303 struct sk_buff *skb;
2304 struct ieee80211_mgmt *resp;
2306 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2307 /* Not to own unicast address */
2311 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2312 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2313 /* Not from the current AP or not associated yet. */
2317 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2318 /* Too short SA Query request frame */
2322 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2326 skb_reserve(skb, local->hw.extra_tx_headroom);
2327 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2328 memset(resp, 0, 24);
2329 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2330 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2331 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2332 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2333 IEEE80211_STYPE_ACTION);
2334 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2335 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2336 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2337 memcpy(resp->u.action.u.sa_query.trans_id,
2338 mgmt->u.action.u.sa_query.trans_id,
2339 WLAN_SA_QUERY_TR_ID_LEN);
2341 ieee80211_tx_skb(sdata, skb);
2344 static ieee80211_rx_result debug_noinline
2345 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2347 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2348 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2351 * From here on, look only at management frames.
2352 * Data and control frames are already handled,
2353 * and unknown (reserved) frames are useless.
2355 if (rx->skb->len < 24)
2356 return RX_DROP_MONITOR;
2358 if (!ieee80211_is_mgmt(mgmt->frame_control))
2359 return RX_DROP_MONITOR;
2361 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2362 ieee80211_is_beacon(mgmt->frame_control) &&
2363 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2366 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2367 sig = status->signal;
2369 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2370 rx->skb->data, rx->skb->len,
2372 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2375 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2376 return RX_DROP_MONITOR;
2378 if (ieee80211_drop_unencrypted_mgmt(rx))
2379 return RX_DROP_UNUSABLE;
2384 static ieee80211_rx_result debug_noinline
2385 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2387 struct ieee80211_local *local = rx->local;
2388 struct ieee80211_sub_if_data *sdata = rx->sdata;
2389 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2390 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2391 int len = rx->skb->len;
2393 if (!ieee80211_is_action(mgmt->frame_control))
2396 /* drop too small frames */
2397 if (len < IEEE80211_MIN_ACTION_SIZE)
2398 return RX_DROP_UNUSABLE;
2400 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2401 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2402 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2403 return RX_DROP_UNUSABLE;
2405 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2406 return RX_DROP_UNUSABLE;
2408 switch (mgmt->u.action.category) {
2409 case WLAN_CATEGORY_HT:
2410 /* reject HT action frames from stations not supporting HT */
2411 if (!rx->sta->sta.ht_cap.ht_supported)
2414 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2415 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2416 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2417 sdata->vif.type != NL80211_IFTYPE_AP &&
2418 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2421 /* verify action & smps_control/chanwidth are present */
2422 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2425 switch (mgmt->u.action.u.ht_smps.action) {
2426 case WLAN_HT_ACTION_SMPS: {
2427 struct ieee80211_supported_band *sband;
2428 enum ieee80211_smps_mode smps_mode;
2430 /* convert to HT capability */
2431 switch (mgmt->u.action.u.ht_smps.smps_control) {
2432 case WLAN_HT_SMPS_CONTROL_DISABLED:
2433 smps_mode = IEEE80211_SMPS_OFF;
2435 case WLAN_HT_SMPS_CONTROL_STATIC:
2436 smps_mode = IEEE80211_SMPS_STATIC;
2438 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2439 smps_mode = IEEE80211_SMPS_DYNAMIC;
2445 /* if no change do nothing */
2446 if (rx->sta->sta.smps_mode == smps_mode)
2448 rx->sta->sta.smps_mode = smps_mode;
2450 sband = rx->local->hw.wiphy->bands[status->band];
2452 rate_control_rate_update(local, sband, rx->sta,
2453 IEEE80211_RC_SMPS_CHANGED);
2456 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2457 struct ieee80211_supported_band *sband;
2458 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2459 enum ieee80211_sta_rx_bandwidth new_bw;
2461 /* If it doesn't support 40 MHz it can't change ... */
2462 if (!(rx->sta->sta.ht_cap.cap &
2463 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2466 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2467 new_bw = IEEE80211_STA_RX_BW_20;
2469 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2471 if (rx->sta->sta.bandwidth == new_bw)
2474 sband = rx->local->hw.wiphy->bands[status->band];
2476 rate_control_rate_update(local, sband, rx->sta,
2477 IEEE80211_RC_BW_CHANGED);
2485 case WLAN_CATEGORY_PUBLIC:
2486 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2488 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2492 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2494 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2495 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2497 if (len < offsetof(struct ieee80211_mgmt,
2498 u.action.u.ext_chan_switch.variable))
2501 case WLAN_CATEGORY_VHT:
2502 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2503 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2504 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2505 sdata->vif.type != NL80211_IFTYPE_AP &&
2506 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2509 /* verify action code is present */
2510 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2513 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2514 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2517 /* verify opmode is present */
2518 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2521 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2523 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2524 opmode, status->band,
2532 case WLAN_CATEGORY_BACK:
2533 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2534 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2535 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2536 sdata->vif.type != NL80211_IFTYPE_AP &&
2537 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2540 /* verify action_code is present */
2541 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2544 switch (mgmt->u.action.u.addba_req.action_code) {
2545 case WLAN_ACTION_ADDBA_REQ:
2546 if (len < (IEEE80211_MIN_ACTION_SIZE +
2547 sizeof(mgmt->u.action.u.addba_req)))
2550 case WLAN_ACTION_ADDBA_RESP:
2551 if (len < (IEEE80211_MIN_ACTION_SIZE +
2552 sizeof(mgmt->u.action.u.addba_resp)))
2555 case WLAN_ACTION_DELBA:
2556 if (len < (IEEE80211_MIN_ACTION_SIZE +
2557 sizeof(mgmt->u.action.u.delba)))
2565 case WLAN_CATEGORY_SPECTRUM_MGMT:
2566 /* verify action_code is present */
2567 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2570 switch (mgmt->u.action.u.measurement.action_code) {
2571 case WLAN_ACTION_SPCT_MSR_REQ:
2572 if (status->band != IEEE80211_BAND_5GHZ)
2575 if (len < (IEEE80211_MIN_ACTION_SIZE +
2576 sizeof(mgmt->u.action.u.measurement)))
2579 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2582 ieee80211_process_measurement_req(sdata, mgmt, len);
2584 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2586 if (len < (IEEE80211_MIN_ACTION_SIZE +
2587 sizeof(mgmt->u.action.u.chan_switch)))
2590 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2591 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2592 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2595 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2596 bssid = sdata->u.mgd.bssid;
2597 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2598 bssid = sdata->u.ibss.bssid;
2599 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2604 if (!ether_addr_equal(mgmt->bssid, bssid))
2611 case WLAN_CATEGORY_SA_QUERY:
2612 if (len < (IEEE80211_MIN_ACTION_SIZE +
2613 sizeof(mgmt->u.action.u.sa_query)))
2616 switch (mgmt->u.action.u.sa_query.action) {
2617 case WLAN_ACTION_SA_QUERY_REQUEST:
2618 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2620 ieee80211_process_sa_query_req(sdata, mgmt, len);
2624 case WLAN_CATEGORY_SELF_PROTECTED:
2625 if (len < (IEEE80211_MIN_ACTION_SIZE +
2626 sizeof(mgmt->u.action.u.self_prot.action_code)))
2629 switch (mgmt->u.action.u.self_prot.action_code) {
2630 case WLAN_SP_MESH_PEERING_OPEN:
2631 case WLAN_SP_MESH_PEERING_CLOSE:
2632 case WLAN_SP_MESH_PEERING_CONFIRM:
2633 if (!ieee80211_vif_is_mesh(&sdata->vif))
2635 if (sdata->u.mesh.user_mpm)
2636 /* userspace handles this frame */
2639 case WLAN_SP_MGK_INFORM:
2640 case WLAN_SP_MGK_ACK:
2641 if (!ieee80211_vif_is_mesh(&sdata->vif))
2646 case WLAN_CATEGORY_MESH_ACTION:
2647 if (len < (IEEE80211_MIN_ACTION_SIZE +
2648 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2651 if (!ieee80211_vif_is_mesh(&sdata->vif))
2653 if (mesh_action_is_path_sel(mgmt) &&
2654 !mesh_path_sel_is_hwmp(sdata))
2662 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2663 /* will return in the next handlers */
2668 rx->sta->rx_packets++;
2669 dev_kfree_skb(rx->skb);
2673 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2674 skb_queue_tail(&sdata->skb_queue, rx->skb);
2675 ieee80211_queue_work(&local->hw, &sdata->work);
2677 rx->sta->rx_packets++;
2681 static ieee80211_rx_result debug_noinline
2682 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2684 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2687 /* skip known-bad action frames and return them in the next handler */
2688 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2692 * Getting here means the kernel doesn't know how to handle
2693 * it, but maybe userspace does ... include returned frames
2694 * so userspace can register for those to know whether ones
2695 * it transmitted were processed or returned.
2698 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2699 sig = status->signal;
2701 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2702 rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2704 rx->sta->rx_packets++;
2705 dev_kfree_skb(rx->skb);
2712 static ieee80211_rx_result debug_noinline
2713 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2715 struct ieee80211_local *local = rx->local;
2716 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2717 struct sk_buff *nskb;
2718 struct ieee80211_sub_if_data *sdata = rx->sdata;
2719 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2721 if (!ieee80211_is_action(mgmt->frame_control))
2725 * For AP mode, hostapd is responsible for handling any action
2726 * frames that we didn't handle, including returning unknown
2727 * ones. For all other modes we will return them to the sender,
2728 * setting the 0x80 bit in the action category, as required by
2729 * 802.11-2012 9.24.4.
2730 * Newer versions of hostapd shall also use the management frame
2731 * registration mechanisms, but older ones still use cooked
2732 * monitor interfaces so push all frames there.
2734 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2735 (sdata->vif.type == NL80211_IFTYPE_AP ||
2736 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2737 return RX_DROP_MONITOR;
2739 if (is_multicast_ether_addr(mgmt->da))
2740 return RX_DROP_MONITOR;
2742 /* do not return rejected action frames */
2743 if (mgmt->u.action.category & 0x80)
2744 return RX_DROP_UNUSABLE;
2746 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2749 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2751 nmgmt->u.action.category |= 0x80;
2752 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2753 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2755 memset(nskb->cb, 0, sizeof(nskb->cb));
2757 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2758 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2760 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2761 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2762 IEEE80211_TX_CTL_NO_CCK_RATE;
2763 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2765 local->hw.offchannel_tx_hw_queue;
2768 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2771 dev_kfree_skb(rx->skb);
2775 static ieee80211_rx_result debug_noinline
2776 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2778 struct ieee80211_sub_if_data *sdata = rx->sdata;
2779 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2782 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2784 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2785 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2786 sdata->vif.type != NL80211_IFTYPE_STATION)
2787 return RX_DROP_MONITOR;
2790 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2791 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2792 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2793 /* process for all: mesh, mlme, ibss */
2795 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2796 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2797 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2798 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2799 if (is_multicast_ether_addr(mgmt->da) &&
2800 !is_broadcast_ether_addr(mgmt->da))
2801 return RX_DROP_MONITOR;
2803 /* process only for station */
2804 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2805 return RX_DROP_MONITOR;
2807 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2808 /* process only for ibss and mesh */
2809 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2810 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2811 return RX_DROP_MONITOR;
2814 return RX_DROP_MONITOR;
2817 /* queue up frame and kick off work to process it */
2818 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2819 skb_queue_tail(&sdata->skb_queue, rx->skb);
2820 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2822 rx->sta->rx_packets++;
2827 /* TODO: use IEEE80211_RX_FRAGMENTED */
2828 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2829 struct ieee80211_rate *rate)
2831 struct ieee80211_sub_if_data *sdata;
2832 struct ieee80211_local *local = rx->local;
2833 struct sk_buff *skb = rx->skb, *skb2;
2834 struct net_device *prev_dev = NULL;
2835 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2836 int needed_headroom;
2839 * If cooked monitor has been processed already, then
2840 * don't do it again. If not, set the flag.
2842 if (rx->flags & IEEE80211_RX_CMNTR)
2844 rx->flags |= IEEE80211_RX_CMNTR;
2846 /* If there are no cooked monitor interfaces, just free the SKB */
2847 if (!local->cooked_mntrs)
2850 /* room for the radiotap header based on driver features */
2851 needed_headroom = ieee80211_rx_radiotap_space(local, status);
2853 if (skb_headroom(skb) < needed_headroom &&
2854 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2857 /* prepend radiotap information */
2858 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2861 skb_set_mac_header(skb, 0);
2862 skb->ip_summed = CHECKSUM_UNNECESSARY;
2863 skb->pkt_type = PACKET_OTHERHOST;
2864 skb->protocol = htons(ETH_P_802_2);
2866 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2867 if (!ieee80211_sdata_running(sdata))
2870 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2871 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2875 skb2 = skb_clone(skb, GFP_ATOMIC);
2877 skb2->dev = prev_dev;
2878 netif_receive_skb(skb2);
2882 prev_dev = sdata->dev;
2883 sdata->dev->stats.rx_packets++;
2884 sdata->dev->stats.rx_bytes += skb->len;
2888 skb->dev = prev_dev;
2889 netif_receive_skb(skb);
2897 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2898 ieee80211_rx_result res)
2901 case RX_DROP_MONITOR:
2902 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2904 rx->sta->rx_dropped++;
2907 struct ieee80211_rate *rate = NULL;
2908 struct ieee80211_supported_band *sband;
2909 struct ieee80211_rx_status *status;
2911 status = IEEE80211_SKB_RXCB((rx->skb));
2913 sband = rx->local->hw.wiphy->bands[status->band];
2914 if (!(status->flag & RX_FLAG_HT) &&
2915 !(status->flag & RX_FLAG_VHT))
2916 rate = &sband->bitrates[status->rate_idx];
2918 ieee80211_rx_cooked_monitor(rx, rate);
2921 case RX_DROP_UNUSABLE:
2922 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2924 rx->sta->rx_dropped++;
2925 dev_kfree_skb(rx->skb);
2928 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2933 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2934 struct sk_buff_head *frames)
2936 ieee80211_rx_result res = RX_DROP_MONITOR;
2937 struct sk_buff *skb;
2939 #define CALL_RXH(rxh) \
2942 if (res != RX_CONTINUE) \
2946 spin_lock_bh(&rx->local->rx_path_lock);
2948 while ((skb = __skb_dequeue(frames))) {
2950 * all the other fields are valid across frames
2951 * that belong to an aMPDU since they are on the
2952 * same TID from the same station
2956 CALL_RXH(ieee80211_rx_h_check_more_data)
2957 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2958 CALL_RXH(ieee80211_rx_h_sta_process)
2959 CALL_RXH(ieee80211_rx_h_decrypt)
2960 CALL_RXH(ieee80211_rx_h_defragment)
2961 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2962 /* must be after MMIC verify so header is counted in MPDU mic */
2963 #ifdef CONFIG_MAC80211_MESH
2964 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2965 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2967 CALL_RXH(ieee80211_rx_h_amsdu)
2968 CALL_RXH(ieee80211_rx_h_data)
2970 /* special treatment -- needs the queue */
2971 res = ieee80211_rx_h_ctrl(rx, frames);
2972 if (res != RX_CONTINUE)
2975 CALL_RXH(ieee80211_rx_h_mgmt_check)
2976 CALL_RXH(ieee80211_rx_h_action)
2977 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2978 CALL_RXH(ieee80211_rx_h_action_return)
2979 CALL_RXH(ieee80211_rx_h_mgmt)
2982 ieee80211_rx_handlers_result(rx, res);
2987 spin_unlock_bh(&rx->local->rx_path_lock);
2990 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2992 struct sk_buff_head reorder_release;
2993 ieee80211_rx_result res = RX_DROP_MONITOR;
2995 __skb_queue_head_init(&reorder_release);
2997 #define CALL_RXH(rxh) \
3000 if (res != RX_CONTINUE) \
3004 CALL_RXH(ieee80211_rx_h_check)
3006 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3008 ieee80211_rx_handlers(rx, &reorder_release);
3012 ieee80211_rx_handlers_result(rx, res);
3018 * This function makes calls into the RX path, therefore
3019 * it has to be invoked under RCU read lock.
3021 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3023 struct sk_buff_head frames;
3024 struct ieee80211_rx_data rx = {
3026 .sdata = sta->sdata,
3027 .local = sta->local,
3028 /* This is OK -- must be QoS data frame */
3029 .security_idx = tid,
3033 struct tid_ampdu_rx *tid_agg_rx;
3035 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3039 __skb_queue_head_init(&frames);
3041 spin_lock(&tid_agg_rx->reorder_lock);
3042 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3043 spin_unlock(&tid_agg_rx->reorder_lock);
3045 ieee80211_rx_handlers(&rx, &frames);
3048 /* main receive path */
3050 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3051 struct ieee80211_hdr *hdr)
3053 struct ieee80211_sub_if_data *sdata = rx->sdata;
3054 struct sk_buff *skb = rx->skb;
3055 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3056 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3057 int multicast = is_multicast_ether_addr(hdr->addr1);
3059 switch (sdata->vif.type) {
3060 case NL80211_IFTYPE_STATION:
3061 if (!bssid && !sdata->u.mgd.use_4addr)
3064 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3065 if (!(sdata->dev->flags & IFF_PROMISC) ||
3066 sdata->u.mgd.use_4addr)
3068 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3071 case NL80211_IFTYPE_ADHOC:
3074 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3075 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3077 if (ieee80211_is_beacon(hdr->frame_control)) {
3079 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3081 } else if (!multicast &&
3082 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3083 if (!(sdata->dev->flags & IFF_PROMISC))
3085 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3086 } else if (!rx->sta) {
3088 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3089 rate_idx = 0; /* TODO: HT/VHT rates */
3091 rate_idx = status->rate_idx;
3092 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3096 case NL80211_IFTYPE_MESH_POINT:
3098 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3099 if (!(sdata->dev->flags & IFF_PROMISC))
3102 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3105 case NL80211_IFTYPE_AP_VLAN:
3106 case NL80211_IFTYPE_AP:
3108 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3110 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3112 * Accept public action frames even when the
3113 * BSSID doesn't match, this is used for P2P
3114 * and location updates. Note that mac80211
3115 * itself never looks at these frames.
3118 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3120 if (ieee80211_is_public_action(hdr, skb->len))
3122 if (!ieee80211_is_beacon(hdr->frame_control))
3124 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3127 case NL80211_IFTYPE_WDS:
3128 if (bssid || !ieee80211_is_data(hdr->frame_control))
3130 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3133 case NL80211_IFTYPE_P2P_DEVICE:
3134 if (!ieee80211_is_public_action(hdr, skb->len) &&
3135 !ieee80211_is_probe_req(hdr->frame_control) &&
3136 !ieee80211_is_probe_resp(hdr->frame_control) &&
3137 !ieee80211_is_beacon(hdr->frame_control))
3139 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3141 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3144 /* should never get here */
3153 * This function returns whether or not the SKB
3154 * was destined for RX processing or not, which,
3155 * if consume is true, is equivalent to whether
3156 * or not the skb was consumed.
3158 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3159 struct sk_buff *skb, bool consume)
3161 struct ieee80211_local *local = rx->local;
3162 struct ieee80211_sub_if_data *sdata = rx->sdata;
3163 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3164 struct ieee80211_hdr *hdr = (void *)skb->data;
3167 status->rx_flags |= IEEE80211_RX_RA_MATCH;
3169 if (!prepare_for_handlers(rx, hdr))
3173 skb = skb_copy(skb, GFP_ATOMIC);
3175 if (net_ratelimit())
3176 wiphy_debug(local->hw.wiphy,
3177 "failed to copy skb for %s\n",
3185 ieee80211_invoke_rx_handlers(rx);
3190 * This is the actual Rx frames handler. as it blongs to Rx path it must
3191 * be called with rcu_read_lock protection.
3193 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3194 struct sk_buff *skb)
3196 struct ieee80211_local *local = hw_to_local(hw);
3197 struct ieee80211_sub_if_data *sdata;
3198 struct ieee80211_hdr *hdr;
3200 struct ieee80211_rx_data rx;
3201 struct ieee80211_sub_if_data *prev;
3202 struct sta_info *sta, *tmp, *prev_sta;
3205 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3206 memset(&rx, 0, sizeof(rx));
3210 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3211 local->dot11ReceivedFragmentCount++;
3213 if (ieee80211_is_mgmt(fc)) {
3214 /* drop frame if too short for header */
3215 if (skb->len < ieee80211_hdrlen(fc))
3218 err = skb_linearize(skb);
3220 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3228 hdr = (struct ieee80211_hdr *)skb->data;
3229 ieee80211_parse_qos(&rx);
3230 ieee80211_verify_alignment(&rx);
3232 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3233 ieee80211_is_beacon(hdr->frame_control)))
3234 ieee80211_scan_rx(local, skb);
3236 if (ieee80211_is_data(fc)) {
3239 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3246 rx.sdata = prev_sta->sdata;
3247 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3254 rx.sdata = prev_sta->sdata;
3256 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3264 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3265 if (!ieee80211_sdata_running(sdata))
3268 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3269 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3273 * frame is destined for this interface, but if it's
3274 * not also for the previous one we handle that after
3275 * the loop to avoid copying the SKB once too much
3283 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3285 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3291 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3294 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3303 * This is the receive path handler. It is called by a low level driver when an
3304 * 802.11 MPDU is received from the hardware.
3306 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3308 struct ieee80211_local *local = hw_to_local(hw);
3309 struct ieee80211_rate *rate = NULL;
3310 struct ieee80211_supported_band *sband;
3311 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3313 WARN_ON_ONCE(softirq_count() == 0);
3315 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3318 sband = local->hw.wiphy->bands[status->band];
3319 if (WARN_ON(!sband))
3323 * If we're suspending, it is possible although not too likely
3324 * that we'd be receiving frames after having already partially
3325 * quiesced the stack. We can't process such frames then since
3326 * that might, for example, cause stations to be added or other
3327 * driver callbacks be invoked.
3329 if (unlikely(local->quiescing || local->suspended))
3332 /* We might be during a HW reconfig, prevent Rx for the same reason */
3333 if (unlikely(local->in_reconfig))
3337 * The same happens when we're not even started,
3338 * but that's worth a warning.
3340 if (WARN_ON(!local->started))
3343 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3345 * Validate the rate, unless a PLCP error means that
3346 * we probably can't have a valid rate here anyway.
3349 if (status->flag & RX_FLAG_HT) {
3351 * rate_idx is MCS index, which can be [0-76]
3354 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3356 * Anything else would be some sort of driver or
3357 * hardware error. The driver should catch hardware
3360 if (WARN(status->rate_idx > 76,
3361 "Rate marked as an HT rate but passed "
3362 "status->rate_idx is not "
3363 "an MCS index [0-76]: %d (0x%02x)\n",
3367 } else if (status->flag & RX_FLAG_VHT) {
3368 if (WARN_ONCE(status->rate_idx > 9 ||
3370 status->vht_nss > 8,
3371 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3372 status->rate_idx, status->vht_nss))
3375 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3377 rate = &sband->bitrates[status->rate_idx];
3381 status->rx_flags = 0;
3384 * key references and virtual interfaces are protected using RCU
3385 * and this requires that we are in a read-side RCU section during
3386 * receive processing
3391 * Frames with failed FCS/PLCP checksum are not returned,
3392 * all other frames are returned without radiotap header
3393 * if it was previously present.
3394 * Also, frames with less than 16 bytes are dropped.
3396 skb = ieee80211_rx_monitor(local, skb, rate);
3402 ieee80211_tpt_led_trig_rx(local,
3403 ((struct ieee80211_hdr *)skb->data)->frame_control,
3405 __ieee80211_rx_handle_packet(hw, skb);
3413 EXPORT_SYMBOL(ieee80211_rx);
3415 /* This is a version of the rx handler that can be called from hard irq
3416 * context. Post the skb on the queue and schedule the tasklet */
3417 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3419 struct ieee80211_local *local = hw_to_local(hw);
3421 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3423 skb->pkt_type = IEEE80211_RX_MSG;
3424 skb_queue_tail(&local->skb_queue, skb);
3425 tasklet_schedule(&local->tasklet);
3427 EXPORT_SYMBOL(ieee80211_rx_irqsafe);