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 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
47 __pskb_trim(skb, skb->len - FCS_LEN);
56 if (status->vendor_radiotap_len)
57 __pskb_pull(skb, status->vendor_radiotap_len);
62 static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
64 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
65 struct ieee80211_hdr *hdr;
67 hdr = (void *)(skb->data + status->vendor_radiotap_len);
69 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
70 RX_FLAG_FAILED_PLCP_CRC |
71 RX_FLAG_AMPDU_IS_ZEROLEN))
73 if (unlikely(skb->len < 16 + present_fcs_len +
74 status->vendor_radiotap_len))
76 if (ieee80211_is_ctl(hdr->frame_control) &&
77 !ieee80211_is_pspoll(hdr->frame_control) &&
78 !ieee80211_is_back_req(hdr->frame_control))
84 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
85 struct ieee80211_rx_status *status)
89 /* always present fields */
90 len = sizeof(struct ieee80211_radiotap_header) + 8;
92 /* allocate extra bitmaps */
93 if (status->vendor_radiotap_len)
96 len += 4 * hweight8(status->chains);
98 if (ieee80211_have_rx_timestamp(status)) {
102 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
105 /* antenna field, if we don't have per-chain info */
109 /* padding for RX_FLAGS if necessary */
112 if (status->flag & RX_FLAG_HT) /* HT info */
115 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
120 if (status->flag & RX_FLAG_VHT) {
125 if (status->chains) {
126 /* antenna and antenna signal fields */
127 len += 2 * hweight8(status->chains);
130 if (status->vendor_radiotap_len) {
131 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
132 status->vendor_radiotap_align = 1;
133 /* align standard part of vendor namespace */
135 /* allocate standard part of vendor namespace */
137 /* align vendor-defined part */
138 len = ALIGN(len, status->vendor_radiotap_align);
139 /* vendor-defined part is already in skb */
146 * ieee80211_add_rx_radiotap_header - add radiotap header
148 * add a radiotap header containing all the fields which the hardware provided.
151 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
153 struct ieee80211_rate *rate,
154 int rtap_len, bool has_fcs)
156 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
157 struct ieee80211_radiotap_header *rthdr;
162 u16 channel_flags = 0;
164 unsigned long chains = status->chains;
167 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
170 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
171 memset(rthdr, 0, rtap_len);
172 it_present = &rthdr->it_present;
174 /* radiotap header, set always present flags */
175 rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
176 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
177 BIT(IEEE80211_RADIOTAP_CHANNEL) |
178 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
181 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
183 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
185 BIT(IEEE80211_RADIOTAP_EXT) |
186 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
187 put_unaligned_le32(it_present_val, it_present);
189 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
190 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
193 if (status->vendor_radiotap_len) {
194 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
195 BIT(IEEE80211_RADIOTAP_EXT);
196 put_unaligned_le32(it_present_val, it_present);
198 it_present_val = status->vendor_radiotap_bitmap;
201 put_unaligned_le32(it_present_val, it_present);
203 pos = (void *)(it_present + 1);
205 /* the order of the following fields is important */
207 /* IEEE80211_RADIOTAP_TSFT */
208 if (ieee80211_have_rx_timestamp(status)) {
210 while ((pos - (u8 *)rthdr) & 7)
213 ieee80211_calculate_rx_timestamp(local, status,
216 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
220 /* IEEE80211_RADIOTAP_FLAGS */
221 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
222 *pos |= IEEE80211_RADIOTAP_F_FCS;
223 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
224 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
225 if (status->flag & RX_FLAG_SHORTPRE)
226 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
229 /* IEEE80211_RADIOTAP_RATE */
230 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
232 * Without rate information don't add it. If we have,
233 * MCS information is a separate field in radiotap,
234 * added below. The byte here is needed as padding
235 * for the channel though, so initialise it to 0.
240 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
241 if (status->flag & RX_FLAG_10MHZ)
243 else if (status->flag & RX_FLAG_5MHZ)
245 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
249 /* IEEE80211_RADIOTAP_CHANNEL */
250 put_unaligned_le16(status->freq, pos);
252 if (status->flag & RX_FLAG_10MHZ)
253 channel_flags |= IEEE80211_CHAN_HALF;
254 else if (status->flag & RX_FLAG_5MHZ)
255 channel_flags |= IEEE80211_CHAN_QUARTER;
257 if (status->band == IEEE80211_BAND_5GHZ)
258 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
259 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
260 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
261 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
262 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
264 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
266 channel_flags |= IEEE80211_CHAN_2GHZ;
267 put_unaligned_le16(channel_flags, pos);
270 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
271 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
272 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
273 *pos = status->signal;
275 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
279 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
281 if (!status->chains) {
282 /* IEEE80211_RADIOTAP_ANTENNA */
283 *pos = status->antenna;
287 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
289 /* IEEE80211_RADIOTAP_RX_FLAGS */
290 /* ensure 2 byte alignment for the 2 byte field as required */
291 if ((pos - (u8 *)rthdr) & 1)
293 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
294 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
295 put_unaligned_le16(rx_flags, pos);
298 if (status->flag & RX_FLAG_HT) {
301 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
302 *pos++ = local->hw.radiotap_mcs_details;
304 if (status->flag & RX_FLAG_SHORT_GI)
305 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
306 if (status->flag & RX_FLAG_40MHZ)
307 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
308 if (status->flag & RX_FLAG_HT_GF)
309 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
310 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
311 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
313 *pos++ = status->rate_idx;
316 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
319 /* ensure 4 byte alignment */
320 while ((pos - (u8 *)rthdr) & 3)
323 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
324 put_unaligned_le32(status->ampdu_reference, pos);
326 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
327 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
328 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
329 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
330 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
331 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
332 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
333 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
334 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
335 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
336 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
337 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
338 put_unaligned_le16(flags, pos);
340 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
341 *pos++ = status->ampdu_delimiter_crc;
347 if (status->flag & RX_FLAG_VHT) {
348 u16 known = local->hw.radiotap_vht_details;
350 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
351 /* known field - how to handle 80+80? */
352 if (status->flag & RX_FLAG_80P80MHZ)
353 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
354 put_unaligned_le16(known, pos);
357 if (status->flag & RX_FLAG_SHORT_GI)
358 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
361 if (status->flag & RX_FLAG_80MHZ)
363 else if (status->flag & RX_FLAG_80P80MHZ)
364 *pos++ = 0; /* marked not known above */
365 else if (status->flag & RX_FLAG_160MHZ)
367 else if (status->flag & RX_FLAG_40MHZ)
372 *pos = (status->rate_idx << 4) | status->vht_nss;
382 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
383 *pos++ = status->chain_signal[chain];
387 if (status->vendor_radiotap_len) {
388 /* ensure 2 byte alignment for the vendor field as required */
389 if ((pos - (u8 *)rthdr) & 1)
391 *pos++ = status->vendor_radiotap_oui[0];
392 *pos++ = status->vendor_radiotap_oui[1];
393 *pos++ = status->vendor_radiotap_oui[2];
394 *pos++ = status->vendor_radiotap_subns;
395 put_unaligned_le16(status->vendor_radiotap_len, pos);
397 /* align the actual payload as requested */
398 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
404 * This function copies a received frame to all monitor interfaces and
405 * returns a cleaned-up SKB that no longer includes the FCS nor the
406 * radiotap header the driver might have added.
408 static struct sk_buff *
409 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
410 struct ieee80211_rate *rate)
412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
413 struct ieee80211_sub_if_data *sdata;
415 struct sk_buff *skb, *skb2;
416 struct net_device *prev_dev = NULL;
417 int present_fcs_len = 0;
420 * First, we may need to make a copy of the skb because
421 * (1) we need to modify it for radiotap (if not present), and
422 * (2) the other RX handlers will modify the skb we got.
424 * We don't need to, of course, if we aren't going to return
425 * the SKB because it has a bad FCS/PLCP checksum.
428 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
429 present_fcs_len = FCS_LEN;
431 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
432 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
433 dev_kfree_skb(origskb);
437 if (!local->monitors) {
438 if (should_drop_frame(origskb, present_fcs_len)) {
439 dev_kfree_skb(origskb);
443 return remove_monitor_info(local, origskb);
446 /* room for the radiotap header based on driver features */
447 needed_headroom = ieee80211_rx_radiotap_space(local, status);
449 if (should_drop_frame(origskb, present_fcs_len)) {
450 /* only need to expand headroom if necessary */
455 * This shouldn't trigger often because most devices have an
456 * RX header they pull before we get here, and that should
457 * be big enough for our radiotap information. We should
458 * probably export the length to drivers so that we can have
459 * them allocate enough headroom to start with.
461 if (skb_headroom(skb) < needed_headroom &&
462 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
468 * Need to make a copy and possibly remove radiotap header
469 * and FCS from the original.
471 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
473 origskb = remove_monitor_info(local, origskb);
479 /* prepend radiotap information */
480 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
483 skb_reset_mac_header(skb);
484 skb->ip_summed = CHECKSUM_UNNECESSARY;
485 skb->pkt_type = PACKET_OTHERHOST;
486 skb->protocol = htons(ETH_P_802_2);
488 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
489 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
492 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
495 if (!ieee80211_sdata_running(sdata))
499 skb2 = skb_clone(skb, GFP_ATOMIC);
501 skb2->dev = prev_dev;
502 netif_receive_skb(skb2);
506 prev_dev = sdata->dev;
507 sdata->dev->stats.rx_packets++;
508 sdata->dev->stats.rx_bytes += skb->len;
513 netif_receive_skb(skb);
520 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
522 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
523 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
524 int tid, seqno_idx, security_idx;
526 /* does the frame have a qos control field? */
527 if (ieee80211_is_data_qos(hdr->frame_control)) {
528 u8 *qc = ieee80211_get_qos_ctl(hdr);
529 /* frame has qos control */
530 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
531 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
532 status->rx_flags |= IEEE80211_RX_AMSDU;
538 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
540 * Sequence numbers for management frames, QoS data
541 * frames with a broadcast/multicast address in the
542 * Address 1 field, and all non-QoS data frames sent
543 * by QoS STAs are assigned using an additional single
544 * modulo-4096 counter, [...]
546 * We also use that counter for non-QoS STAs.
548 seqno_idx = IEEE80211_NUM_TIDS;
550 if (ieee80211_is_mgmt(hdr->frame_control))
551 security_idx = IEEE80211_NUM_TIDS;
555 rx->seqno_idx = seqno_idx;
556 rx->security_idx = security_idx;
557 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
558 * For now, set skb->priority to 0 for other cases. */
559 rx->skb->priority = (tid > 7) ? 0 : tid;
563 * DOC: Packet alignment
565 * Drivers always need to pass packets that are aligned to two-byte boundaries
568 * Additionally, should, if possible, align the payload data in a way that
569 * guarantees that the contained IP header is aligned to a four-byte
570 * boundary. In the case of regular frames, this simply means aligning the
571 * payload to a four-byte boundary (because either the IP header is directly
572 * contained, or IV/RFC1042 headers that have a length divisible by four are
573 * in front of it). If the payload data is not properly aligned and the
574 * architecture doesn't support efficient unaligned operations, mac80211
575 * will align the data.
577 * With A-MSDU frames, however, the payload data address must yield two modulo
578 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
579 * push the IP header further back to a multiple of four again. Thankfully, the
580 * specs were sane enough this time around to require padding each A-MSDU
581 * subframe to a length that is a multiple of four.
583 * Padding like Atheros hardware adds which is between the 802.11 header and
584 * the payload is not supported, the driver is required to move the 802.11
585 * header to be directly in front of the payload in that case.
587 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
589 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
590 WARN_ONCE((unsigned long)rx->skb->data & 1,
591 "unaligned packet at 0x%p\n", rx->skb->data);
598 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
600 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
602 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
605 return ieee80211_is_robust_mgmt_frame(hdr);
609 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
613 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
616 return ieee80211_is_robust_mgmt_frame(hdr);
620 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
621 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
623 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
624 struct ieee80211_mmie *mmie;
626 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
629 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
630 return -1; /* not a robust management frame */
632 mmie = (struct ieee80211_mmie *)
633 (skb->data + skb->len - sizeof(*mmie));
634 if (mmie->element_id != WLAN_EID_MMIE ||
635 mmie->length != sizeof(*mmie) - 2)
638 return le16_to_cpu(mmie->key_id);
641 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
644 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
649 fc = hdr->frame_control;
650 hdrlen = ieee80211_hdrlen(fc);
652 if (skb->len < hdrlen + cs->hdr_len)
655 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
656 keyid &= cs->key_idx_mask;
657 keyid >>= cs->key_idx_shift;
662 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
664 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
665 char *dev_addr = rx->sdata->vif.addr;
667 if (ieee80211_is_data(hdr->frame_control)) {
668 if (is_multicast_ether_addr(hdr->addr1)) {
669 if (ieee80211_has_tods(hdr->frame_control) ||
670 !ieee80211_has_fromds(hdr->frame_control))
671 return RX_DROP_MONITOR;
672 if (ether_addr_equal(hdr->addr3, dev_addr))
673 return RX_DROP_MONITOR;
675 if (!ieee80211_has_a4(hdr->frame_control))
676 return RX_DROP_MONITOR;
677 if (ether_addr_equal(hdr->addr4, dev_addr))
678 return RX_DROP_MONITOR;
682 /* If there is not an established peer link and this is not a peer link
683 * establisment frame, beacon or probe, drop the frame.
686 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
687 struct ieee80211_mgmt *mgmt;
689 if (!ieee80211_is_mgmt(hdr->frame_control))
690 return RX_DROP_MONITOR;
692 if (ieee80211_is_action(hdr->frame_control)) {
695 /* make sure category field is present */
696 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
697 return RX_DROP_MONITOR;
699 mgmt = (struct ieee80211_mgmt *)hdr;
700 category = mgmt->u.action.category;
701 if (category != WLAN_CATEGORY_MESH_ACTION &&
702 category != WLAN_CATEGORY_SELF_PROTECTED)
703 return RX_DROP_MONITOR;
707 if (ieee80211_is_probe_req(hdr->frame_control) ||
708 ieee80211_is_probe_resp(hdr->frame_control) ||
709 ieee80211_is_beacon(hdr->frame_control) ||
710 ieee80211_is_auth(hdr->frame_control))
713 return RX_DROP_MONITOR;
719 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
720 struct tid_ampdu_rx *tid_agg_rx,
722 struct sk_buff_head *frames)
724 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
725 struct ieee80211_rx_status *status;
727 lockdep_assert_held(&tid_agg_rx->reorder_lock);
732 /* release the frame from the reorder ring buffer */
733 tid_agg_rx->stored_mpdu_num--;
734 tid_agg_rx->reorder_buf[index] = NULL;
735 status = IEEE80211_SKB_RXCB(skb);
736 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
737 __skb_queue_tail(frames, skb);
740 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
743 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
744 struct tid_ampdu_rx *tid_agg_rx,
746 struct sk_buff_head *frames)
750 lockdep_assert_held(&tid_agg_rx->reorder_lock);
752 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
753 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
754 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
760 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
761 * the skb was added to the buffer longer than this time ago, the earlier
762 * frames that have not yet been received are assumed to be lost and the skb
763 * can be released for processing. This may also release other skb's from the
764 * reorder buffer if there are no additional gaps between the frames.
766 * Callers must hold tid_agg_rx->reorder_lock.
768 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
770 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
771 struct tid_ampdu_rx *tid_agg_rx,
772 struct sk_buff_head *frames)
776 lockdep_assert_held(&tid_agg_rx->reorder_lock);
778 /* release the buffer until next missing frame */
779 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
780 if (!tid_agg_rx->reorder_buf[index] &&
781 tid_agg_rx->stored_mpdu_num) {
783 * No buffers ready to be released, but check whether any
784 * frames in the reorder buffer have timed out.
787 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
788 j = (j + 1) % tid_agg_rx->buf_size) {
789 if (!tid_agg_rx->reorder_buf[j]) {
794 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
795 HT_RX_REORDER_BUF_TIMEOUT))
796 goto set_release_timer;
798 ht_dbg_ratelimited(sdata,
799 "release an RX reorder frame due to timeout on earlier frames\n");
800 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
804 * Increment the head seq# also for the skipped slots.
806 tid_agg_rx->head_seq_num =
807 (tid_agg_rx->head_seq_num +
808 skipped) & IEEE80211_SN_MASK;
811 } else while (tid_agg_rx->reorder_buf[index]) {
812 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
814 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
817 if (tid_agg_rx->stored_mpdu_num) {
818 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
820 for (; j != (index - 1) % tid_agg_rx->buf_size;
821 j = (j + 1) % tid_agg_rx->buf_size) {
822 if (tid_agg_rx->reorder_buf[j])
828 mod_timer(&tid_agg_rx->reorder_timer,
829 tid_agg_rx->reorder_time[j] + 1 +
830 HT_RX_REORDER_BUF_TIMEOUT);
832 del_timer(&tid_agg_rx->reorder_timer);
837 * As this function belongs to the RX path it must be under
838 * rcu_read_lock protection. It returns false if the frame
839 * can be processed immediately, true if it was consumed.
841 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
842 struct tid_ampdu_rx *tid_agg_rx,
844 struct sk_buff_head *frames)
846 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
847 u16 sc = le16_to_cpu(hdr->seq_ctrl);
848 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
849 u16 head_seq_num, buf_size;
853 spin_lock(&tid_agg_rx->reorder_lock);
855 buf_size = tid_agg_rx->buf_size;
856 head_seq_num = tid_agg_rx->head_seq_num;
858 /* frame with out of date sequence number */
859 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
865 * If frame the sequence number exceeds our buffering window
866 * size release some previous frames to make room for this one.
868 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
869 head_seq_num = ieee80211_sn_inc(
870 ieee80211_sn_sub(mpdu_seq_num, buf_size));
871 /* release stored frames up to new head to stack */
872 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
873 head_seq_num, frames);
876 /* Now the new frame is always in the range of the reordering buffer */
878 index = mpdu_seq_num % tid_agg_rx->buf_size;
880 /* check if we already stored this frame */
881 if (tid_agg_rx->reorder_buf[index]) {
887 * If the current MPDU is in the right order and nothing else
888 * is stored we can process it directly, no need to buffer it.
889 * If it is first but there's something stored, we may be able
890 * to release frames after this one.
892 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
893 tid_agg_rx->stored_mpdu_num == 0) {
894 tid_agg_rx->head_seq_num =
895 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
900 /* put the frame in the reordering buffer */
901 tid_agg_rx->reorder_buf[index] = skb;
902 tid_agg_rx->reorder_time[index] = jiffies;
903 tid_agg_rx->stored_mpdu_num++;
904 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
907 spin_unlock(&tid_agg_rx->reorder_lock);
912 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
913 * true if the MPDU was buffered, false if it should be processed.
915 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
916 struct sk_buff_head *frames)
918 struct sk_buff *skb = rx->skb;
919 struct ieee80211_local *local = rx->local;
920 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
921 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
922 struct sta_info *sta = rx->sta;
923 struct tid_ampdu_rx *tid_agg_rx;
927 if (!ieee80211_is_data_qos(hdr->frame_control))
931 * filter the QoS data rx stream according to
932 * STA/TID and check if this STA/TID is on aggregation
938 ack_policy = *ieee80211_get_qos_ctl(hdr) &
939 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
940 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
942 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
946 /* qos null data frames are excluded */
947 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
950 /* not part of a BA session */
951 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
952 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
955 /* not actually part of this BA session */
956 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
959 /* new, potentially un-ordered, ampdu frame - process it */
961 /* reset session timer */
962 if (tid_agg_rx->timeout)
963 tid_agg_rx->last_rx = jiffies;
965 /* if this mpdu is fragmented - terminate rx aggregation session */
966 sc = le16_to_cpu(hdr->seq_ctrl);
967 if (sc & IEEE80211_SCTL_FRAG) {
968 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
969 skb_queue_tail(&rx->sdata->skb_queue, skb);
970 ieee80211_queue_work(&local->hw, &rx->sdata->work);
975 * No locking needed -- we will only ever process one
976 * RX packet at a time, and thus own tid_agg_rx. All
977 * other code manipulating it needs to (and does) make
978 * sure that we cannot get to it any more before doing
981 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
986 __skb_queue_tail(frames, skb);
989 static ieee80211_rx_result debug_noinline
990 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
992 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
993 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
996 * Drop duplicate 802.11 retransmissions
997 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
999 if (rx->skb->len >= 24 && rx->sta &&
1000 !ieee80211_is_ctl(hdr->frame_control) &&
1001 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1002 !is_multicast_ether_addr(hdr->addr1)) {
1003 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1004 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
1006 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1007 rx->local->dot11FrameDuplicateCount++;
1008 rx->sta->num_duplicates++;
1010 return RX_DROP_UNUSABLE;
1011 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1012 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1016 if (unlikely(rx->skb->len < 16)) {
1017 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1018 return RX_DROP_MONITOR;
1021 /* Drop disallowed frame classes based on STA auth/assoc state;
1022 * IEEE 802.11, Chap 5.5.
1024 * mac80211 filters only based on association state, i.e. it drops
1025 * Class 3 frames from not associated stations. hostapd sends
1026 * deauth/disassoc frames when needed. In addition, hostapd is
1027 * responsible for filtering on both auth and assoc states.
1030 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1031 return ieee80211_rx_mesh_check(rx);
1033 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1034 ieee80211_is_pspoll(hdr->frame_control)) &&
1035 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1036 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1037 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1039 * accept port control frames from the AP even when it's not
1040 * yet marked ASSOC to prevent a race where we don't set the
1041 * assoc bit quickly enough before it sends the first frame
1043 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1044 ieee80211_is_data_present(hdr->frame_control)) {
1045 unsigned int hdrlen;
1048 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1050 if (rx->skb->len < hdrlen + 8)
1051 return RX_DROP_MONITOR;
1053 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1054 if (ethertype == rx->sdata->control_port_protocol)
1058 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1059 cfg80211_rx_spurious_frame(rx->sdata->dev,
1062 return RX_DROP_UNUSABLE;
1064 return RX_DROP_MONITOR;
1071 static ieee80211_rx_result debug_noinline
1072 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1074 struct ieee80211_local *local;
1075 struct ieee80211_hdr *hdr;
1076 struct sk_buff *skb;
1080 hdr = (struct ieee80211_hdr *) skb->data;
1082 if (!local->pspolling)
1085 if (!ieee80211_has_fromds(hdr->frame_control))
1086 /* this is not from AP */
1089 if (!ieee80211_is_data(hdr->frame_control))
1092 if (!ieee80211_has_moredata(hdr->frame_control)) {
1093 /* AP has no more frames buffered for us */
1094 local->pspolling = false;
1098 /* more data bit is set, let's request a new frame from the AP */
1099 ieee80211_send_pspoll(local, rx->sdata);
1104 static void sta_ps_start(struct sta_info *sta)
1106 struct ieee80211_sub_if_data *sdata = sta->sdata;
1107 struct ieee80211_local *local = sdata->local;
1110 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1111 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1112 ps = &sdata->bss->ps;
1116 atomic_inc(&ps->num_sta_ps);
1117 set_sta_flag(sta, WLAN_STA_PS_STA);
1118 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1119 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1120 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1121 sta->sta.addr, sta->sta.aid);
1124 static void sta_ps_end(struct sta_info *sta)
1126 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1127 sta->sta.addr, sta->sta.aid);
1129 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1130 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1131 sta->sta.addr, sta->sta.aid);
1135 ieee80211_sta_ps_deliver_wakeup(sta);
1138 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1140 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1143 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1145 /* Don't let the same PS state be set twice */
1146 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1147 if ((start && in_ps) || (!start && !in_ps))
1151 sta_ps_start(sta_inf);
1153 sta_ps_end(sta_inf);
1157 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1159 static ieee80211_rx_result debug_noinline
1160 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1162 struct ieee80211_sub_if_data *sdata = rx->sdata;
1163 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1164 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1167 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1170 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1171 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1175 * The device handles station powersave, so don't do anything about
1176 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1177 * it to mac80211 since they're handled.)
1179 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1183 * Don't do anything if the station isn't already asleep. In
1184 * the uAPSD case, the station will probably be marked asleep,
1185 * in the PS-Poll case the station must be confused ...
1187 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1190 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1191 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1192 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1193 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1195 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1198 /* Free PS Poll skb here instead of returning RX_DROP that would
1199 * count as an dropped frame. */
1200 dev_kfree_skb(rx->skb);
1203 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1204 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1205 ieee80211_has_pm(hdr->frame_control) &&
1206 (ieee80211_is_data_qos(hdr->frame_control) ||
1207 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1208 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1209 ac = ieee802_1d_to_ac[tid & 7];
1212 * If this AC is not trigger-enabled do nothing.
1214 * NB: This could/should check a separate bitmap of trigger-
1215 * enabled queues, but for now we only implement uAPSD w/o
1216 * TSPEC changes to the ACs, so they're always the same.
1218 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1221 /* if we are in a service period, do nothing */
1222 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1225 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1226 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1228 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1234 static ieee80211_rx_result debug_noinline
1235 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1237 struct sta_info *sta = rx->sta;
1238 struct sk_buff *skb = rx->skb;
1239 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1240 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1247 * Update last_rx only for IBSS packets which are for the current
1248 * BSSID and for station already AUTHORIZED to avoid keeping the
1249 * current IBSS network alive in cases where other STAs start
1250 * using different BSSID. This will also give the station another
1251 * chance to restart the authentication/authorization in case
1252 * something went wrong the first time.
1254 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1255 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1256 NL80211_IFTYPE_ADHOC);
1257 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1258 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1259 sta->last_rx = jiffies;
1260 if (ieee80211_is_data(hdr->frame_control)) {
1261 sta->last_rx_rate_idx = status->rate_idx;
1262 sta->last_rx_rate_flag = status->flag;
1263 sta->last_rx_rate_vht_nss = status->vht_nss;
1266 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1268 * Mesh beacons will update last_rx when if they are found to
1269 * match the current local configuration when processed.
1271 sta->last_rx = jiffies;
1272 if (ieee80211_is_data(hdr->frame_control)) {
1273 sta->last_rx_rate_idx = status->rate_idx;
1274 sta->last_rx_rate_flag = status->flag;
1275 sta->last_rx_rate_vht_nss = status->vht_nss;
1279 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1282 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1283 ieee80211_sta_rx_notify(rx->sdata, hdr);
1285 sta->rx_fragments++;
1286 sta->rx_bytes += rx->skb->len;
1287 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1288 sta->last_signal = status->signal;
1289 ewma_add(&sta->avg_signal, -status->signal);
1292 if (status->chains) {
1293 sta->chains = status->chains;
1294 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1295 int signal = status->chain_signal[i];
1297 if (!(status->chains & BIT(i)))
1300 sta->chain_signal_last[i] = signal;
1301 ewma_add(&sta->chain_signal_avg[i], -signal);
1306 * Change STA power saving mode only at the end of a frame
1307 * exchange sequence.
1309 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1310 !ieee80211_has_morefrags(hdr->frame_control) &&
1311 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1312 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1313 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1314 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1316 * Ignore doze->wake transitions that are
1317 * indicated by non-data frames, the standard
1318 * is unclear here, but for example going to
1319 * PS mode and then scanning would cause a
1320 * doze->wake transition for the probe request,
1321 * and that is clearly undesirable.
1323 if (ieee80211_is_data(hdr->frame_control) &&
1324 !ieee80211_has_pm(hdr->frame_control))
1327 if (ieee80211_has_pm(hdr->frame_control))
1332 /* mesh power save support */
1333 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1334 ieee80211_mps_rx_h_sta_process(sta, hdr);
1337 * Drop (qos-)data::nullfunc frames silently, since they
1338 * are used only to control station power saving mode.
1340 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1341 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1342 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1345 * If we receive a 4-addr nullfunc frame from a STA
1346 * that was not moved to a 4-addr STA vlan yet send
1347 * the event to userspace and for older hostapd drop
1348 * the frame to the monitor interface.
1350 if (ieee80211_has_a4(hdr->frame_control) &&
1351 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1353 !rx->sdata->u.vlan.sta))) {
1354 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1355 cfg80211_rx_unexpected_4addr_frame(
1356 rx->sdata->dev, sta->sta.addr,
1358 return RX_DROP_MONITOR;
1361 * Update counter and free packet here to avoid
1362 * counting this as a dropped packed.
1365 dev_kfree_skb(rx->skb);
1370 } /* ieee80211_rx_h_sta_process */
1372 static ieee80211_rx_result debug_noinline
1373 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1375 struct sk_buff *skb = rx->skb;
1376 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1377 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1380 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1381 struct ieee80211_key *sta_ptk = NULL;
1382 int mmie_keyidx = -1;
1384 const struct ieee80211_cipher_scheme *cs = NULL;
1389 * There are four types of keys:
1390 * - GTK (group keys)
1391 * - IGTK (group keys for management frames)
1392 * - PTK (pairwise keys)
1393 * - STK (station-to-station pairwise keys)
1395 * When selecting a key, we have to distinguish between multicast
1396 * (including broadcast) and unicast frames, the latter can only
1397 * use PTKs and STKs while the former always use GTKs and IGTKs.
1398 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1399 * unicast frames can also use key indices like GTKs. Hence, if we
1400 * don't have a PTK/STK we check the key index for a WEP key.
1402 * Note that in a regular BSS, multicast frames are sent by the
1403 * AP only, associated stations unicast the frame to the AP first
1404 * which then multicasts it on their behalf.
1406 * There is also a slight problem in IBSS mode: GTKs are negotiated
1407 * with each station, that is something we don't currently handle.
1408 * The spec seems to expect that one negotiates the same key with
1409 * every station but there's no such requirement; VLANs could be
1414 * No point in finding a key and decrypting if the frame is neither
1415 * addressed to us nor a multicast frame.
1417 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1420 /* start without a key */
1422 fc = hdr->frame_control;
1425 int keyid = rx->sta->ptk_idx;
1427 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1428 cs = rx->sta->cipher_scheme;
1429 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1430 if (unlikely(keyid < 0))
1431 return RX_DROP_UNUSABLE;
1433 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1436 if (!ieee80211_has_protected(fc))
1437 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1439 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1441 if ((status->flag & RX_FLAG_DECRYPTED) &&
1442 (status->flag & RX_FLAG_IV_STRIPPED))
1444 /* Skip decryption if the frame is not protected. */
1445 if (!ieee80211_has_protected(fc))
1447 } else if (mmie_keyidx >= 0) {
1448 /* Broadcast/multicast robust management frame / BIP */
1449 if ((status->flag & RX_FLAG_DECRYPTED) &&
1450 (status->flag & RX_FLAG_IV_STRIPPED))
1453 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1454 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1455 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1457 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1459 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1460 } else if (!ieee80211_has_protected(fc)) {
1462 * The frame was not protected, so skip decryption. However, we
1463 * need to set rx->key if there is a key that could have been
1464 * used so that the frame may be dropped if encryption would
1465 * have been expected.
1467 struct ieee80211_key *key = NULL;
1468 struct ieee80211_sub_if_data *sdata = rx->sdata;
1471 if (ieee80211_is_mgmt(fc) &&
1472 is_multicast_ether_addr(hdr->addr1) &&
1473 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1477 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1478 key = rcu_dereference(rx->sta->gtk[i]);
1484 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1485 key = rcu_dereference(sdata->keys[i]);
1498 * The device doesn't give us the IV so we won't be
1499 * able to look up the key. That's ok though, we
1500 * don't need to decrypt the frame, we just won't
1501 * be able to keep statistics accurate.
1502 * Except for key threshold notifications, should
1503 * we somehow allow the driver to tell us which key
1504 * the hardware used if this flag is set?
1506 if ((status->flag & RX_FLAG_DECRYPTED) &&
1507 (status->flag & RX_FLAG_IV_STRIPPED))
1510 hdrlen = ieee80211_hdrlen(fc);
1513 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1515 if (unlikely(keyidx < 0))
1516 return RX_DROP_UNUSABLE;
1518 if (rx->skb->len < 8 + hdrlen)
1519 return RX_DROP_UNUSABLE; /* TODO: count this? */
1521 * no need to call ieee80211_wep_get_keyidx,
1522 * it verifies a bunch of things we've done already
1524 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1525 keyidx = keyid >> 6;
1528 /* check per-station GTK first, if multicast packet */
1529 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1530 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1532 /* if not found, try default key */
1534 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1537 * RSNA-protected unicast frames should always be
1538 * sent with pairwise or station-to-station keys,
1539 * but for WEP we allow using a key index as well.
1542 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1543 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1544 !is_multicast_ether_addr(hdr->addr1))
1550 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1551 return RX_DROP_MONITOR;
1553 rx->key->tx_rx_count++;
1554 /* TODO: add threshold stuff again */
1556 return RX_DROP_MONITOR;
1559 switch (rx->key->conf.cipher) {
1560 case WLAN_CIPHER_SUITE_WEP40:
1561 case WLAN_CIPHER_SUITE_WEP104:
1562 result = ieee80211_crypto_wep_decrypt(rx);
1564 case WLAN_CIPHER_SUITE_TKIP:
1565 result = ieee80211_crypto_tkip_decrypt(rx);
1567 case WLAN_CIPHER_SUITE_CCMP:
1568 result = ieee80211_crypto_ccmp_decrypt(rx);
1570 case WLAN_CIPHER_SUITE_AES_CMAC:
1571 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1574 result = ieee80211_crypto_hw_decrypt(rx);
1577 /* the hdr variable is invalid after the decrypt handlers */
1579 /* either the frame has been decrypted or will be dropped */
1580 status->flag |= RX_FLAG_DECRYPTED;
1585 static inline struct ieee80211_fragment_entry *
1586 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1587 unsigned int frag, unsigned int seq, int rx_queue,
1588 struct sk_buff **skb)
1590 struct ieee80211_fragment_entry *entry;
1592 entry = &sdata->fragments[sdata->fragment_next++];
1593 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1594 sdata->fragment_next = 0;
1596 if (!skb_queue_empty(&entry->skb_list))
1597 __skb_queue_purge(&entry->skb_list);
1599 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1601 entry->first_frag_time = jiffies;
1603 entry->rx_queue = rx_queue;
1604 entry->last_frag = frag;
1606 entry->extra_len = 0;
1611 static inline struct ieee80211_fragment_entry *
1612 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1613 unsigned int frag, unsigned int seq,
1614 int rx_queue, struct ieee80211_hdr *hdr)
1616 struct ieee80211_fragment_entry *entry;
1619 idx = sdata->fragment_next;
1620 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1621 struct ieee80211_hdr *f_hdr;
1625 idx = IEEE80211_FRAGMENT_MAX - 1;
1627 entry = &sdata->fragments[idx];
1628 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1629 entry->rx_queue != rx_queue ||
1630 entry->last_frag + 1 != frag)
1633 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1636 * Check ftype and addresses are equal, else check next fragment
1638 if (((hdr->frame_control ^ f_hdr->frame_control) &
1639 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1640 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1641 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1644 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1645 __skb_queue_purge(&entry->skb_list);
1654 static ieee80211_rx_result debug_noinline
1655 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1657 struct ieee80211_hdr *hdr;
1660 unsigned int frag, seq;
1661 struct ieee80211_fragment_entry *entry;
1662 struct sk_buff *skb;
1663 struct ieee80211_rx_status *status;
1665 hdr = (struct ieee80211_hdr *)rx->skb->data;
1666 fc = hdr->frame_control;
1668 if (ieee80211_is_ctl(fc))
1671 sc = le16_to_cpu(hdr->seq_ctrl);
1672 frag = sc & IEEE80211_SCTL_FRAG;
1674 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1675 is_multicast_ether_addr(hdr->addr1))) {
1676 /* not fragmented */
1679 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1681 if (skb_linearize(rx->skb))
1682 return RX_DROP_UNUSABLE;
1685 * skb_linearize() might change the skb->data and
1686 * previously cached variables (in this case, hdr) need to
1687 * be refreshed with the new data.
1689 hdr = (struct ieee80211_hdr *)rx->skb->data;
1690 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1693 /* This is the first fragment of a new frame. */
1694 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1695 rx->seqno_idx, &(rx->skb));
1696 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1697 ieee80211_has_protected(fc)) {
1698 int queue = rx->security_idx;
1699 /* Store CCMP PN so that we can verify that the next
1700 * fragment has a sequential PN value. */
1702 memcpy(entry->last_pn,
1703 rx->key->u.ccmp.rx_pn[queue],
1704 IEEE80211_CCMP_PN_LEN);
1709 /* This is a fragment for a frame that should already be pending in
1710 * fragment cache. Add this fragment to the end of the pending entry.
1712 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1713 rx->seqno_idx, hdr);
1715 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1716 return RX_DROP_MONITOR;
1719 /* Verify that MPDUs within one MSDU have sequential PN values.
1720 * (IEEE 802.11i, 8.3.3.4.5) */
1723 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1725 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1726 return RX_DROP_UNUSABLE;
1727 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1728 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1733 queue = rx->security_idx;
1734 rpn = rx->key->u.ccmp.rx_pn[queue];
1735 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1736 return RX_DROP_UNUSABLE;
1737 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1740 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1741 __skb_queue_tail(&entry->skb_list, rx->skb);
1742 entry->last_frag = frag;
1743 entry->extra_len += rx->skb->len;
1744 if (ieee80211_has_morefrags(fc)) {
1749 rx->skb = __skb_dequeue(&entry->skb_list);
1750 if (skb_tailroom(rx->skb) < entry->extra_len) {
1751 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1752 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1754 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1755 __skb_queue_purge(&entry->skb_list);
1756 return RX_DROP_UNUSABLE;
1759 while ((skb = __skb_dequeue(&entry->skb_list))) {
1760 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1764 /* Complete frame has been reassembled - process it now */
1765 status = IEEE80211_SKB_RXCB(rx->skb);
1766 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1770 rx->sta->rx_packets++;
1771 if (is_multicast_ether_addr(hdr->addr1))
1772 rx->local->dot11MulticastReceivedFrameCount++;
1774 ieee80211_led_rx(rx->local);
1778 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1780 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1786 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1788 struct sk_buff *skb = rx->skb;
1789 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1792 * Pass through unencrypted frames if the hardware has
1793 * decrypted them already.
1795 if (status->flag & RX_FLAG_DECRYPTED)
1798 /* Drop unencrypted frames if key is set. */
1799 if (unlikely(!ieee80211_has_protected(fc) &&
1800 !ieee80211_is_nullfunc(fc) &&
1801 ieee80211_is_data(fc) &&
1802 (rx->key || rx->sdata->drop_unencrypted)))
1808 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1810 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1811 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1812 __le16 fc = hdr->frame_control;
1815 * Pass through unencrypted frames if the hardware has
1816 * decrypted them already.
1818 if (status->flag & RX_FLAG_DECRYPTED)
1821 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1822 if (unlikely(!ieee80211_has_protected(fc) &&
1823 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1825 if (ieee80211_is_deauth(fc) ||
1826 ieee80211_is_disassoc(fc))
1827 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1832 /* BIP does not use Protected field, so need to check MMIE */
1833 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1834 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1835 if (ieee80211_is_deauth(fc) ||
1836 ieee80211_is_disassoc(fc))
1837 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1843 * When using MFP, Action frames are not allowed prior to
1844 * having configured keys.
1846 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1847 ieee80211_is_robust_mgmt_frame(
1848 (struct ieee80211_hdr *) rx->skb->data)))
1856 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1858 struct ieee80211_sub_if_data *sdata = rx->sdata;
1859 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1860 bool check_port_control = false;
1861 struct ethhdr *ehdr;
1864 *port_control = false;
1865 if (ieee80211_has_a4(hdr->frame_control) &&
1866 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1869 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1870 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1872 if (!sdata->u.mgd.use_4addr)
1875 check_port_control = true;
1878 if (is_multicast_ether_addr(hdr->addr1) &&
1879 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1882 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1886 ehdr = (struct ethhdr *) rx->skb->data;
1887 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1888 *port_control = true;
1889 else if (check_port_control)
1896 * requires that rx->skb is a frame with ethernet header
1898 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1900 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1901 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1902 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1905 * Allow EAPOL frames to us/the PAE group address regardless
1906 * of whether the frame was encrypted or not.
1908 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1909 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1910 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1913 if (ieee80211_802_1x_port_control(rx) ||
1914 ieee80211_drop_unencrypted(rx, fc))
1921 * requires that rx->skb is a frame with ethernet header
1924 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1926 struct ieee80211_sub_if_data *sdata = rx->sdata;
1927 struct net_device *dev = sdata->dev;
1928 struct sk_buff *skb, *xmit_skb;
1929 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1930 struct sta_info *dsta;
1931 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1936 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1937 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1938 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1939 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1940 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1941 if (is_multicast_ether_addr(ehdr->h_dest)) {
1943 * send multicast frames both to higher layers in
1944 * local net stack and back to the wireless medium
1946 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1948 net_info_ratelimited("%s: failed to clone multicast frame\n",
1951 dsta = sta_info_get(sdata, skb->data);
1954 * The destination station is associated to
1955 * this AP (in this VLAN), so send the frame
1956 * directly to it and do not pass it to local
1966 int align __maybe_unused;
1968 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1970 * 'align' will only take the values 0 or 2 here
1971 * since all frames are required to be aligned
1972 * to 2-byte boundaries when being passed to
1973 * mac80211; the code here works just as well if
1974 * that isn't true, but mac80211 assumes it can
1975 * access fields as 2-byte aligned (e.g. for
1976 * compare_ether_addr)
1978 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1980 if (WARN_ON(skb_headroom(skb) < 3)) {
1984 u8 *data = skb->data;
1985 size_t len = skb_headlen(skb);
1987 memmove(skb->data, data, len);
1988 skb_set_tail_pointer(skb, len);
1994 /* deliver to local stack */
1995 skb->protocol = eth_type_trans(skb, dev);
1996 memset(skb->cb, 0, sizeof(skb->cb));
1997 netif_receive_skb(skb);
2003 * Send to wireless media and increase priority by 256 to
2004 * keep the received priority instead of reclassifying
2005 * the frame (see cfg80211_classify8021d).
2007 xmit_skb->priority += 256;
2008 xmit_skb->protocol = htons(ETH_P_802_3);
2009 skb_reset_network_header(xmit_skb);
2010 skb_reset_mac_header(xmit_skb);
2011 dev_queue_xmit(xmit_skb);
2015 static ieee80211_rx_result debug_noinline
2016 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2018 struct net_device *dev = rx->sdata->dev;
2019 struct sk_buff *skb = rx->skb;
2020 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2021 __le16 fc = hdr->frame_control;
2022 struct sk_buff_head frame_list;
2023 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2025 if (unlikely(!ieee80211_is_data(fc)))
2028 if (unlikely(!ieee80211_is_data_present(fc)))
2029 return RX_DROP_MONITOR;
2031 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2034 if (ieee80211_has_a4(hdr->frame_control) &&
2035 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2036 !rx->sdata->u.vlan.sta)
2037 return RX_DROP_UNUSABLE;
2039 if (is_multicast_ether_addr(hdr->addr1) &&
2040 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2041 rx->sdata->u.vlan.sta) ||
2042 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2043 rx->sdata->u.mgd.use_4addr)))
2044 return RX_DROP_UNUSABLE;
2047 __skb_queue_head_init(&frame_list);
2049 if (skb_linearize(skb))
2050 return RX_DROP_UNUSABLE;
2052 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2053 rx->sdata->vif.type,
2054 rx->local->hw.extra_tx_headroom, true);
2056 while (!skb_queue_empty(&frame_list)) {
2057 rx->skb = __skb_dequeue(&frame_list);
2059 if (!ieee80211_frame_allowed(rx, fc)) {
2060 dev_kfree_skb(rx->skb);
2063 dev->stats.rx_packets++;
2064 dev->stats.rx_bytes += rx->skb->len;
2066 ieee80211_deliver_skb(rx);
2072 #ifdef CONFIG_MAC80211_MESH
2073 static ieee80211_rx_result
2074 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2076 struct ieee80211_hdr *fwd_hdr, *hdr;
2077 struct ieee80211_tx_info *info;
2078 struct ieee80211s_hdr *mesh_hdr;
2079 struct sk_buff *skb = rx->skb, *fwd_skb;
2080 struct ieee80211_local *local = rx->local;
2081 struct ieee80211_sub_if_data *sdata = rx->sdata;
2082 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2083 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2084 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
2087 hdr = (struct ieee80211_hdr *) skb->data;
2088 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2090 /* make sure fixed part of mesh header is there, also checks skb len */
2091 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2092 return RX_DROP_MONITOR;
2094 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2096 /* make sure full mesh header is there, also checks skb len */
2097 if (!pskb_may_pull(rx->skb,
2098 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2099 return RX_DROP_MONITOR;
2101 /* reload pointers */
2102 hdr = (struct ieee80211_hdr *) skb->data;
2103 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2105 /* frame is in RMC, don't forward */
2106 if (ieee80211_is_data(hdr->frame_control) &&
2107 is_multicast_ether_addr(hdr->addr1) &&
2108 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2109 return RX_DROP_MONITOR;
2111 if (!ieee80211_is_data(hdr->frame_control) ||
2112 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2116 return RX_DROP_MONITOR;
2118 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2119 struct mesh_path *mppath;
2123 if (is_multicast_ether_addr(hdr->addr1)) {
2124 mpp_addr = hdr->addr3;
2125 proxied_addr = mesh_hdr->eaddr1;
2126 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2127 /* has_a4 already checked in ieee80211_rx_mesh_check */
2128 mpp_addr = hdr->addr4;
2129 proxied_addr = mesh_hdr->eaddr2;
2131 return RX_DROP_MONITOR;
2135 mppath = mpp_path_lookup(sdata, proxied_addr);
2137 mpp_path_add(sdata, proxied_addr, mpp_addr);
2139 spin_lock_bh(&mppath->state_lock);
2140 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2141 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2142 spin_unlock_bh(&mppath->state_lock);
2147 /* Frame has reached destination. Don't forward */
2148 if (!is_multicast_ether_addr(hdr->addr1) &&
2149 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2152 q = ieee80211_select_queue_80211(sdata, skb, hdr);
2153 if (ieee80211_queue_stopped(&local->hw, q)) {
2154 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2155 return RX_DROP_MONITOR;
2157 skb_set_queue_mapping(skb, q);
2159 if (!--mesh_hdr->ttl) {
2160 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2164 if (!ifmsh->mshcfg.dot11MeshForwarding)
2167 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2169 net_info_ratelimited("%s: failed to clone mesh frame\n",
2174 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2175 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2176 info = IEEE80211_SKB_CB(fwd_skb);
2177 memset(info, 0, sizeof(*info));
2178 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2179 info->control.vif = &rx->sdata->vif;
2180 info->control.jiffies = jiffies;
2181 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2182 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2183 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2184 /* update power mode indication when forwarding */
2185 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2186 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2187 /* mesh power mode flags updated in mesh_nexthop_lookup */
2188 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2190 /* unable to resolve next hop */
2191 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2192 fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
2193 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2195 return RX_DROP_MONITOR;
2198 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2199 ieee80211_add_pending_skb(local, fwd_skb);
2201 if (is_multicast_ether_addr(hdr->addr1) ||
2202 sdata->dev->flags & IFF_PROMISC)
2205 return RX_DROP_MONITOR;
2209 static ieee80211_rx_result debug_noinline
2210 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2212 struct ieee80211_sub_if_data *sdata = rx->sdata;
2213 struct ieee80211_local *local = rx->local;
2214 struct net_device *dev = sdata->dev;
2215 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2216 __le16 fc = hdr->frame_control;
2220 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2223 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2224 return RX_DROP_MONITOR;
2227 * Send unexpected-4addr-frame event to hostapd. For older versions,
2228 * also drop the frame to cooked monitor interfaces.
2230 if (ieee80211_has_a4(hdr->frame_control) &&
2231 sdata->vif.type == NL80211_IFTYPE_AP) {
2233 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2234 cfg80211_rx_unexpected_4addr_frame(
2235 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2236 return RX_DROP_MONITOR;
2239 err = __ieee80211_data_to_8023(rx, &port_control);
2241 return RX_DROP_UNUSABLE;
2243 if (!ieee80211_frame_allowed(rx, fc))
2244 return RX_DROP_MONITOR;
2246 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2247 unlikely(port_control) && sdata->bss) {
2248 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2256 dev->stats.rx_packets++;
2257 dev->stats.rx_bytes += rx->skb->len;
2259 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2260 !is_multicast_ether_addr(
2261 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2262 (!local->scanning &&
2263 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2264 mod_timer(&local->dynamic_ps_timer, jiffies +
2265 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2268 ieee80211_deliver_skb(rx);
2273 static ieee80211_rx_result debug_noinline
2274 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2276 struct sk_buff *skb = rx->skb;
2277 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2278 struct tid_ampdu_rx *tid_agg_rx;
2282 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2285 if (ieee80211_is_back_req(bar->frame_control)) {
2287 __le16 control, start_seq_num;
2288 } __packed bar_data;
2291 return RX_DROP_MONITOR;
2293 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2294 &bar_data, sizeof(bar_data)))
2295 return RX_DROP_MONITOR;
2297 tid = le16_to_cpu(bar_data.control) >> 12;
2299 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2301 return RX_DROP_MONITOR;
2303 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2305 /* reset session timer */
2306 if (tid_agg_rx->timeout)
2307 mod_timer(&tid_agg_rx->session_timer,
2308 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2310 spin_lock(&tid_agg_rx->reorder_lock);
2311 /* release stored frames up to start of BAR */
2312 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2313 start_seq_num, frames);
2314 spin_unlock(&tid_agg_rx->reorder_lock);
2321 * After this point, we only want management frames,
2322 * so we can drop all remaining control frames to
2323 * cooked monitor interfaces.
2325 return RX_DROP_MONITOR;
2328 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2329 struct ieee80211_mgmt *mgmt,
2332 struct ieee80211_local *local = sdata->local;
2333 struct sk_buff *skb;
2334 struct ieee80211_mgmt *resp;
2336 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2337 /* Not to own unicast address */
2341 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2342 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2343 /* Not from the current AP or not associated yet. */
2347 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2348 /* Too short SA Query request frame */
2352 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2356 skb_reserve(skb, local->hw.extra_tx_headroom);
2357 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2358 memset(resp, 0, 24);
2359 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2360 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2361 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2362 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2363 IEEE80211_STYPE_ACTION);
2364 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2365 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2366 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2367 memcpy(resp->u.action.u.sa_query.trans_id,
2368 mgmt->u.action.u.sa_query.trans_id,
2369 WLAN_SA_QUERY_TR_ID_LEN);
2371 ieee80211_tx_skb(sdata, skb);
2374 static ieee80211_rx_result debug_noinline
2375 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2377 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2378 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2381 * From here on, look only at management frames.
2382 * Data and control frames are already handled,
2383 * and unknown (reserved) frames are useless.
2385 if (rx->skb->len < 24)
2386 return RX_DROP_MONITOR;
2388 if (!ieee80211_is_mgmt(mgmt->frame_control))
2389 return RX_DROP_MONITOR;
2391 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2392 ieee80211_is_beacon(mgmt->frame_control) &&
2393 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2396 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2397 sig = status->signal;
2399 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2400 rx->skb->data, rx->skb->len,
2402 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2405 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2406 return RX_DROP_MONITOR;
2408 if (ieee80211_drop_unencrypted_mgmt(rx))
2409 return RX_DROP_UNUSABLE;
2414 static ieee80211_rx_result debug_noinline
2415 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2417 struct ieee80211_local *local = rx->local;
2418 struct ieee80211_sub_if_data *sdata = rx->sdata;
2419 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2420 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2421 int len = rx->skb->len;
2423 if (!ieee80211_is_action(mgmt->frame_control))
2426 /* drop too small frames */
2427 if (len < IEEE80211_MIN_ACTION_SIZE)
2428 return RX_DROP_UNUSABLE;
2430 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2431 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2432 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2433 return RX_DROP_UNUSABLE;
2435 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2436 return RX_DROP_UNUSABLE;
2438 switch (mgmt->u.action.category) {
2439 case WLAN_CATEGORY_HT:
2440 /* reject HT action frames from stations not supporting HT */
2441 if (!rx->sta->sta.ht_cap.ht_supported)
2444 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2445 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2446 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2447 sdata->vif.type != NL80211_IFTYPE_AP &&
2448 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2451 /* verify action & smps_control/chanwidth are present */
2452 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2455 switch (mgmt->u.action.u.ht_smps.action) {
2456 case WLAN_HT_ACTION_SMPS: {
2457 struct ieee80211_supported_band *sband;
2458 enum ieee80211_smps_mode smps_mode;
2460 /* convert to HT capability */
2461 switch (mgmt->u.action.u.ht_smps.smps_control) {
2462 case WLAN_HT_SMPS_CONTROL_DISABLED:
2463 smps_mode = IEEE80211_SMPS_OFF;
2465 case WLAN_HT_SMPS_CONTROL_STATIC:
2466 smps_mode = IEEE80211_SMPS_STATIC;
2468 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2469 smps_mode = IEEE80211_SMPS_DYNAMIC;
2475 /* if no change do nothing */
2476 if (rx->sta->sta.smps_mode == smps_mode)
2478 rx->sta->sta.smps_mode = smps_mode;
2480 sband = rx->local->hw.wiphy->bands[status->band];
2482 rate_control_rate_update(local, sband, rx->sta,
2483 IEEE80211_RC_SMPS_CHANGED);
2486 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2487 struct ieee80211_supported_band *sband;
2488 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2489 enum ieee80211_sta_rx_bandwidth new_bw;
2491 /* If it doesn't support 40 MHz it can't change ... */
2492 if (!(rx->sta->sta.ht_cap.cap &
2493 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2496 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2497 new_bw = IEEE80211_STA_RX_BW_20;
2499 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2501 if (rx->sta->sta.bandwidth == new_bw)
2504 sband = rx->local->hw.wiphy->bands[status->band];
2506 rate_control_rate_update(local, sband, rx->sta,
2507 IEEE80211_RC_BW_CHANGED);
2515 case WLAN_CATEGORY_PUBLIC:
2516 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2518 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2522 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2524 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2525 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2527 if (len < offsetof(struct ieee80211_mgmt,
2528 u.action.u.ext_chan_switch.variable))
2531 case WLAN_CATEGORY_VHT:
2532 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2533 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2534 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2535 sdata->vif.type != NL80211_IFTYPE_AP &&
2536 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2539 /* verify action code is present */
2540 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2543 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2544 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2547 /* verify opmode is present */
2548 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2551 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2553 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2554 opmode, status->band,
2562 case WLAN_CATEGORY_BACK:
2563 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2564 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2565 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2566 sdata->vif.type != NL80211_IFTYPE_AP &&
2567 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2570 /* verify action_code is present */
2571 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2574 switch (mgmt->u.action.u.addba_req.action_code) {
2575 case WLAN_ACTION_ADDBA_REQ:
2576 if (len < (IEEE80211_MIN_ACTION_SIZE +
2577 sizeof(mgmt->u.action.u.addba_req)))
2580 case WLAN_ACTION_ADDBA_RESP:
2581 if (len < (IEEE80211_MIN_ACTION_SIZE +
2582 sizeof(mgmt->u.action.u.addba_resp)))
2585 case WLAN_ACTION_DELBA:
2586 if (len < (IEEE80211_MIN_ACTION_SIZE +
2587 sizeof(mgmt->u.action.u.delba)))
2595 case WLAN_CATEGORY_SPECTRUM_MGMT:
2596 /* verify action_code is present */
2597 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2600 switch (mgmt->u.action.u.measurement.action_code) {
2601 case WLAN_ACTION_SPCT_MSR_REQ:
2602 if (status->band != IEEE80211_BAND_5GHZ)
2605 if (len < (IEEE80211_MIN_ACTION_SIZE +
2606 sizeof(mgmt->u.action.u.measurement)))
2609 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2612 ieee80211_process_measurement_req(sdata, mgmt, len);
2614 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2616 if (len < (IEEE80211_MIN_ACTION_SIZE +
2617 sizeof(mgmt->u.action.u.chan_switch)))
2620 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2621 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2622 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2625 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2626 bssid = sdata->u.mgd.bssid;
2627 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2628 bssid = sdata->u.ibss.bssid;
2629 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2634 if (!ether_addr_equal(mgmt->bssid, bssid))
2641 case WLAN_CATEGORY_SA_QUERY:
2642 if (len < (IEEE80211_MIN_ACTION_SIZE +
2643 sizeof(mgmt->u.action.u.sa_query)))
2646 switch (mgmt->u.action.u.sa_query.action) {
2647 case WLAN_ACTION_SA_QUERY_REQUEST:
2648 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2650 ieee80211_process_sa_query_req(sdata, mgmt, len);
2654 case WLAN_CATEGORY_SELF_PROTECTED:
2655 if (len < (IEEE80211_MIN_ACTION_SIZE +
2656 sizeof(mgmt->u.action.u.self_prot.action_code)))
2659 switch (mgmt->u.action.u.self_prot.action_code) {
2660 case WLAN_SP_MESH_PEERING_OPEN:
2661 case WLAN_SP_MESH_PEERING_CLOSE:
2662 case WLAN_SP_MESH_PEERING_CONFIRM:
2663 if (!ieee80211_vif_is_mesh(&sdata->vif))
2665 if (sdata->u.mesh.user_mpm)
2666 /* userspace handles this frame */
2669 case WLAN_SP_MGK_INFORM:
2670 case WLAN_SP_MGK_ACK:
2671 if (!ieee80211_vif_is_mesh(&sdata->vif))
2676 case WLAN_CATEGORY_MESH_ACTION:
2677 if (len < (IEEE80211_MIN_ACTION_SIZE +
2678 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2681 if (!ieee80211_vif_is_mesh(&sdata->vif))
2683 if (mesh_action_is_path_sel(mgmt) &&
2684 !mesh_path_sel_is_hwmp(sdata))
2692 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2693 /* will return in the next handlers */
2698 rx->sta->rx_packets++;
2699 dev_kfree_skb(rx->skb);
2703 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2704 skb_queue_tail(&sdata->skb_queue, rx->skb);
2705 ieee80211_queue_work(&local->hw, &sdata->work);
2707 rx->sta->rx_packets++;
2711 static ieee80211_rx_result debug_noinline
2712 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2714 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2717 /* skip known-bad action frames and return them in the next handler */
2718 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2722 * Getting here means the kernel doesn't know how to handle
2723 * it, but maybe userspace does ... include returned frames
2724 * so userspace can register for those to know whether ones
2725 * it transmitted were processed or returned.
2728 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2729 sig = status->signal;
2731 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2732 rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2734 rx->sta->rx_packets++;
2735 dev_kfree_skb(rx->skb);
2742 static ieee80211_rx_result debug_noinline
2743 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2745 struct ieee80211_local *local = rx->local;
2746 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2747 struct sk_buff *nskb;
2748 struct ieee80211_sub_if_data *sdata = rx->sdata;
2749 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2751 if (!ieee80211_is_action(mgmt->frame_control))
2755 * For AP mode, hostapd is responsible for handling any action
2756 * frames that we didn't handle, including returning unknown
2757 * ones. For all other modes we will return them to the sender,
2758 * setting the 0x80 bit in the action category, as required by
2759 * 802.11-2012 9.24.4.
2760 * Newer versions of hostapd shall also use the management frame
2761 * registration mechanisms, but older ones still use cooked
2762 * monitor interfaces so push all frames there.
2764 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2765 (sdata->vif.type == NL80211_IFTYPE_AP ||
2766 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2767 return RX_DROP_MONITOR;
2769 if (is_multicast_ether_addr(mgmt->da))
2770 return RX_DROP_MONITOR;
2772 /* do not return rejected action frames */
2773 if (mgmt->u.action.category & 0x80)
2774 return RX_DROP_UNUSABLE;
2776 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2779 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2781 nmgmt->u.action.category |= 0x80;
2782 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2783 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2785 memset(nskb->cb, 0, sizeof(nskb->cb));
2787 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2788 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2790 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2791 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2792 IEEE80211_TX_CTL_NO_CCK_RATE;
2793 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2795 local->hw.offchannel_tx_hw_queue;
2798 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2801 dev_kfree_skb(rx->skb);
2805 static ieee80211_rx_result debug_noinline
2806 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2808 struct ieee80211_sub_if_data *sdata = rx->sdata;
2809 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2812 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2814 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2815 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2816 sdata->vif.type != NL80211_IFTYPE_STATION)
2817 return RX_DROP_MONITOR;
2820 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2821 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2822 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2823 /* process for all: mesh, mlme, ibss */
2825 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2826 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2827 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2828 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2829 if (is_multicast_ether_addr(mgmt->da) &&
2830 !is_broadcast_ether_addr(mgmt->da))
2831 return RX_DROP_MONITOR;
2833 /* process only for station */
2834 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2835 return RX_DROP_MONITOR;
2837 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2838 /* process only for ibss and mesh */
2839 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2840 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2841 return RX_DROP_MONITOR;
2844 return RX_DROP_MONITOR;
2847 /* queue up frame and kick off work to process it */
2848 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2849 skb_queue_tail(&sdata->skb_queue, rx->skb);
2850 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2852 rx->sta->rx_packets++;
2857 /* TODO: use IEEE80211_RX_FRAGMENTED */
2858 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2859 struct ieee80211_rate *rate)
2861 struct ieee80211_sub_if_data *sdata;
2862 struct ieee80211_local *local = rx->local;
2863 struct sk_buff *skb = rx->skb, *skb2;
2864 struct net_device *prev_dev = NULL;
2865 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2866 int needed_headroom;
2869 * If cooked monitor has been processed already, then
2870 * don't do it again. If not, set the flag.
2872 if (rx->flags & IEEE80211_RX_CMNTR)
2874 rx->flags |= IEEE80211_RX_CMNTR;
2876 /* If there are no cooked monitor interfaces, just free the SKB */
2877 if (!local->cooked_mntrs)
2880 /* room for the radiotap header based on driver features */
2881 needed_headroom = ieee80211_rx_radiotap_space(local, status);
2883 if (skb_headroom(skb) < needed_headroom &&
2884 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2887 /* prepend radiotap information */
2888 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2891 skb_set_mac_header(skb, 0);
2892 skb->ip_summed = CHECKSUM_UNNECESSARY;
2893 skb->pkt_type = PACKET_OTHERHOST;
2894 skb->protocol = htons(ETH_P_802_2);
2896 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2897 if (!ieee80211_sdata_running(sdata))
2900 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2901 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2905 skb2 = skb_clone(skb, GFP_ATOMIC);
2907 skb2->dev = prev_dev;
2908 netif_receive_skb(skb2);
2912 prev_dev = sdata->dev;
2913 sdata->dev->stats.rx_packets++;
2914 sdata->dev->stats.rx_bytes += skb->len;
2918 skb->dev = prev_dev;
2919 netif_receive_skb(skb);
2927 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2928 ieee80211_rx_result res)
2931 case RX_DROP_MONITOR:
2932 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2934 rx->sta->rx_dropped++;
2937 struct ieee80211_rate *rate = NULL;
2938 struct ieee80211_supported_band *sband;
2939 struct ieee80211_rx_status *status;
2941 status = IEEE80211_SKB_RXCB((rx->skb));
2943 sband = rx->local->hw.wiphy->bands[status->band];
2944 if (!(status->flag & RX_FLAG_HT) &&
2945 !(status->flag & RX_FLAG_VHT))
2946 rate = &sband->bitrates[status->rate_idx];
2948 ieee80211_rx_cooked_monitor(rx, rate);
2951 case RX_DROP_UNUSABLE:
2952 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2954 rx->sta->rx_dropped++;
2955 dev_kfree_skb(rx->skb);
2958 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2963 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2964 struct sk_buff_head *frames)
2966 ieee80211_rx_result res = RX_DROP_MONITOR;
2967 struct sk_buff *skb;
2969 #define CALL_RXH(rxh) \
2972 if (res != RX_CONTINUE) \
2976 spin_lock_bh(&rx->local->rx_path_lock);
2978 while ((skb = __skb_dequeue(frames))) {
2980 * all the other fields are valid across frames
2981 * that belong to an aMPDU since they are on the
2982 * same TID from the same station
2986 CALL_RXH(ieee80211_rx_h_check_more_data)
2987 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2988 CALL_RXH(ieee80211_rx_h_sta_process)
2989 CALL_RXH(ieee80211_rx_h_decrypt)
2990 CALL_RXH(ieee80211_rx_h_defragment)
2991 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2992 /* must be after MMIC verify so header is counted in MPDU mic */
2993 #ifdef CONFIG_MAC80211_MESH
2994 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2995 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2997 CALL_RXH(ieee80211_rx_h_amsdu)
2998 CALL_RXH(ieee80211_rx_h_data)
3000 /* special treatment -- needs the queue */
3001 res = ieee80211_rx_h_ctrl(rx, frames);
3002 if (res != RX_CONTINUE)
3005 CALL_RXH(ieee80211_rx_h_mgmt_check)
3006 CALL_RXH(ieee80211_rx_h_action)
3007 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3008 CALL_RXH(ieee80211_rx_h_action_return)
3009 CALL_RXH(ieee80211_rx_h_mgmt)
3012 ieee80211_rx_handlers_result(rx, res);
3017 spin_unlock_bh(&rx->local->rx_path_lock);
3020 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3022 struct sk_buff_head reorder_release;
3023 ieee80211_rx_result res = RX_DROP_MONITOR;
3025 __skb_queue_head_init(&reorder_release);
3027 #define CALL_RXH(rxh) \
3030 if (res != RX_CONTINUE) \
3034 CALL_RXH(ieee80211_rx_h_check)
3036 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3038 ieee80211_rx_handlers(rx, &reorder_release);
3042 ieee80211_rx_handlers_result(rx, res);
3048 * This function makes calls into the RX path, therefore
3049 * it has to be invoked under RCU read lock.
3051 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3053 struct sk_buff_head frames;
3054 struct ieee80211_rx_data rx = {
3056 .sdata = sta->sdata,
3057 .local = sta->local,
3058 /* This is OK -- must be QoS data frame */
3059 .security_idx = tid,
3063 struct tid_ampdu_rx *tid_agg_rx;
3065 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3069 __skb_queue_head_init(&frames);
3071 spin_lock(&tid_agg_rx->reorder_lock);
3072 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3073 spin_unlock(&tid_agg_rx->reorder_lock);
3075 ieee80211_rx_handlers(&rx, &frames);
3078 /* main receive path */
3080 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
3081 struct ieee80211_hdr *hdr)
3083 struct ieee80211_sub_if_data *sdata = rx->sdata;
3084 struct sk_buff *skb = rx->skb;
3085 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3086 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3087 int multicast = is_multicast_ether_addr(hdr->addr1);
3089 switch (sdata->vif.type) {
3090 case NL80211_IFTYPE_STATION:
3091 if (!bssid && !sdata->u.mgd.use_4addr)
3094 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3095 if (!(sdata->dev->flags & IFF_PROMISC) ||
3096 sdata->u.mgd.use_4addr)
3098 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3101 case NL80211_IFTYPE_ADHOC:
3104 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3105 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3107 if (ieee80211_is_beacon(hdr->frame_control)) {
3109 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3111 } else if (!multicast &&
3112 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3113 if (!(sdata->dev->flags & IFF_PROMISC))
3115 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3116 } else if (!rx->sta) {
3118 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3119 rate_idx = 0; /* TODO: HT/VHT rates */
3121 rate_idx = status->rate_idx;
3122 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3126 case NL80211_IFTYPE_MESH_POINT:
3128 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3129 if (!(sdata->dev->flags & IFF_PROMISC))
3132 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3135 case NL80211_IFTYPE_AP_VLAN:
3136 case NL80211_IFTYPE_AP:
3138 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3140 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3142 * Accept public action frames even when the
3143 * BSSID doesn't match, this is used for P2P
3144 * and location updates. Note that mac80211
3145 * itself never looks at these frames.
3148 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3150 if (ieee80211_is_public_action(hdr, skb->len))
3152 if (!ieee80211_is_beacon(hdr->frame_control))
3154 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3157 case NL80211_IFTYPE_WDS:
3158 if (bssid || !ieee80211_is_data(hdr->frame_control))
3160 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3163 case NL80211_IFTYPE_P2P_DEVICE:
3164 if (!ieee80211_is_public_action(hdr, skb->len) &&
3165 !ieee80211_is_probe_req(hdr->frame_control) &&
3166 !ieee80211_is_probe_resp(hdr->frame_control) &&
3167 !ieee80211_is_beacon(hdr->frame_control))
3169 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3171 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3174 /* should never get here */
3183 * This function returns whether or not the SKB
3184 * was destined for RX processing or not, which,
3185 * if consume is true, is equivalent to whether
3186 * or not the skb was consumed.
3188 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3189 struct sk_buff *skb, bool consume)
3191 struct ieee80211_local *local = rx->local;
3192 struct ieee80211_sub_if_data *sdata = rx->sdata;
3193 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3194 struct ieee80211_hdr *hdr = (void *)skb->data;
3198 status->rx_flags |= IEEE80211_RX_RA_MATCH;
3199 prepares = prepare_for_handlers(rx, hdr);
3205 skb = skb_copy(skb, GFP_ATOMIC);
3207 if (net_ratelimit())
3208 wiphy_debug(local->hw.wiphy,
3209 "failed to copy skb for %s\n",
3217 ieee80211_invoke_rx_handlers(rx);
3222 * This is the actual Rx frames handler. as it blongs to Rx path it must
3223 * be called with rcu_read_lock protection.
3225 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3226 struct sk_buff *skb)
3228 struct ieee80211_local *local = hw_to_local(hw);
3229 struct ieee80211_sub_if_data *sdata;
3230 struct ieee80211_hdr *hdr;
3232 struct ieee80211_rx_data rx;
3233 struct ieee80211_sub_if_data *prev;
3234 struct sta_info *sta, *tmp, *prev_sta;
3237 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3238 memset(&rx, 0, sizeof(rx));
3242 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3243 local->dot11ReceivedFragmentCount++;
3245 if (ieee80211_is_mgmt(fc)) {
3246 /* drop frame if too short for header */
3247 if (skb->len < ieee80211_hdrlen(fc))
3250 err = skb_linearize(skb);
3252 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3260 hdr = (struct ieee80211_hdr *)skb->data;
3261 ieee80211_parse_qos(&rx);
3262 ieee80211_verify_alignment(&rx);
3264 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3265 ieee80211_is_beacon(hdr->frame_control)))
3266 ieee80211_scan_rx(local, skb);
3268 if (ieee80211_is_data(fc)) {
3271 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3278 rx.sdata = prev_sta->sdata;
3279 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3286 rx.sdata = prev_sta->sdata;
3288 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3296 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3297 if (!ieee80211_sdata_running(sdata))
3300 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3301 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3305 * frame is destined for this interface, but if it's
3306 * not also for the previous one we handle that after
3307 * the loop to avoid copying the SKB once too much
3315 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3317 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3323 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3326 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3335 * This is the receive path handler. It is called by a low level driver when an
3336 * 802.11 MPDU is received from the hardware.
3338 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3340 struct ieee80211_local *local = hw_to_local(hw);
3341 struct ieee80211_rate *rate = NULL;
3342 struct ieee80211_supported_band *sband;
3343 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3345 WARN_ON_ONCE(softirq_count() == 0);
3347 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3350 sband = local->hw.wiphy->bands[status->band];
3351 if (WARN_ON(!sband))
3355 * If we're suspending, it is possible although not too likely
3356 * that we'd be receiving frames after having already partially
3357 * quiesced the stack. We can't process such frames then since
3358 * that might, for example, cause stations to be added or other
3359 * driver callbacks be invoked.
3361 if (unlikely(local->quiescing || local->suspended))
3364 /* We might be during a HW reconfig, prevent Rx for the same reason */
3365 if (unlikely(local->in_reconfig))
3369 * The same happens when we're not even started,
3370 * but that's worth a warning.
3372 if (WARN_ON(!local->started))
3375 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3377 * Validate the rate, unless a PLCP error means that
3378 * we probably can't have a valid rate here anyway.
3381 if (status->flag & RX_FLAG_HT) {
3383 * rate_idx is MCS index, which can be [0-76]
3386 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3388 * Anything else would be some sort of driver or
3389 * hardware error. The driver should catch hardware
3392 if (WARN(status->rate_idx > 76,
3393 "Rate marked as an HT rate but passed "
3394 "status->rate_idx is not "
3395 "an MCS index [0-76]: %d (0x%02x)\n",
3399 } else if (status->flag & RX_FLAG_VHT) {
3400 if (WARN_ONCE(status->rate_idx > 9 ||
3402 status->vht_nss > 8,
3403 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3404 status->rate_idx, status->vht_nss))
3407 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3409 rate = &sband->bitrates[status->rate_idx];
3413 status->rx_flags = 0;
3416 * key references and virtual interfaces are protected using RCU
3417 * and this requires that we are in a read-side RCU section during
3418 * receive processing
3423 * Frames with failed FCS/PLCP checksum are not returned,
3424 * all other frames are returned without radiotap header
3425 * if it was previously present.
3426 * Also, frames with less than 16 bytes are dropped.
3428 skb = ieee80211_rx_monitor(local, skb, rate);
3434 ieee80211_tpt_led_trig_rx(local,
3435 ((struct ieee80211_hdr *)skb->data)->frame_control,
3437 __ieee80211_rx_handle_packet(hw, skb);
3445 EXPORT_SYMBOL(ieee80211_rx);
3447 /* This is a version of the rx handler that can be called from hard irq
3448 * context. Post the skb on the queue and schedule the tasklet */
3449 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3451 struct ieee80211_local *local = hw_to_local(hw);
3453 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3455 skb->pkt_type = IEEE80211_RX_MSG;
3456 skb_queue_tail(&local->skb_queue, skb);
3457 tasklet_schedule(&local->tasklet);
3459 EXPORT_SYMBOL(ieee80211_rx_irqsafe);