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) + 9;
92 /* allocate extra bitmap */
93 if (status->vendor_radiotap_len)
96 if (ieee80211_have_rx_timestamp(status)) {
100 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
103 /* padding for RX_FLAGS if necessary */
106 if (status->flag & RX_FLAG_HT) /* HT info */
109 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
114 if (status->flag & RX_FLAG_VHT) {
119 if (status->vendor_radiotap_len) {
120 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
121 status->vendor_radiotap_align = 1;
122 /* align standard part of vendor namespace */
124 /* allocate standard part of vendor namespace */
126 /* align vendor-defined part */
127 len = ALIGN(len, status->vendor_radiotap_align);
128 /* vendor-defined part is already in skb */
135 * ieee80211_add_rx_radiotap_header - add radiotap header
137 * add a radiotap header containing all the fields which the hardware provided.
140 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
142 struct ieee80211_rate *rate,
143 int rtap_len, bool has_fcs)
145 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
146 struct ieee80211_radiotap_header *rthdr;
152 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
155 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
156 memset(rthdr, 0, rtap_len);
158 /* radiotap header, set always present flags */
160 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
161 (1 << IEEE80211_RADIOTAP_CHANNEL) |
162 (1 << IEEE80211_RADIOTAP_ANTENNA) |
163 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
164 rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
166 pos = (unsigned char *)(rthdr + 1);
168 if (status->vendor_radiotap_len) {
170 cpu_to_le32(BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE)) |
171 cpu_to_le32(BIT(IEEE80211_RADIOTAP_EXT));
172 put_unaligned_le32(status->vendor_radiotap_bitmap, pos);
176 /* the order of the following fields is important */
178 /* IEEE80211_RADIOTAP_TSFT */
179 if (ieee80211_have_rx_timestamp(status)) {
181 while ((pos - (u8 *)rthdr) & 7)
184 ieee80211_calculate_rx_timestamp(local, status,
187 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
191 /* IEEE80211_RADIOTAP_FLAGS */
192 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
193 *pos |= IEEE80211_RADIOTAP_F_FCS;
194 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
195 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
196 if (status->flag & RX_FLAG_SHORTPRE)
197 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
200 /* IEEE80211_RADIOTAP_RATE */
201 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
203 * Without rate information don't add it. If we have,
204 * MCS information is a separate field in radiotap,
205 * added below. The byte here is needed as padding
206 * for the channel though, so initialise it to 0.
210 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
211 *pos = rate->bitrate / 5;
215 /* IEEE80211_RADIOTAP_CHANNEL */
216 put_unaligned_le16(status->freq, pos);
218 if (status->band == IEEE80211_BAND_5GHZ)
219 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
221 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
222 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
224 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
225 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
228 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
231 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
234 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
235 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
236 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
237 *pos = status->signal;
239 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
243 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
245 /* IEEE80211_RADIOTAP_ANTENNA */
246 *pos = status->antenna;
249 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
251 /* IEEE80211_RADIOTAP_RX_FLAGS */
252 /* ensure 2 byte alignment for the 2 byte field as required */
253 if ((pos - (u8 *)rthdr) & 1)
255 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
256 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
257 put_unaligned_le16(rx_flags, pos);
260 if (status->flag & RX_FLAG_HT) {
261 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
262 *pos++ = local->hw.radiotap_mcs_details;
264 if (status->flag & RX_FLAG_SHORT_GI)
265 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
266 if (status->flag & RX_FLAG_40MHZ)
267 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
268 if (status->flag & RX_FLAG_HT_GF)
269 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
271 *pos++ = status->rate_idx;
274 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
277 /* ensure 4 byte alignment */
278 while ((pos - (u8 *)rthdr) & 3)
281 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
282 put_unaligned_le32(status->ampdu_reference, pos);
284 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
285 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
286 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
287 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
288 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
289 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
290 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
291 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
292 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
293 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
294 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
295 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
296 put_unaligned_le16(flags, pos);
298 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
299 *pos++ = status->ampdu_delimiter_crc;
305 if (status->flag & RX_FLAG_VHT) {
306 u16 known = local->hw.radiotap_vht_details;
308 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
309 /* known field - how to handle 80+80? */
310 if (status->flag & RX_FLAG_80P80MHZ)
311 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
312 put_unaligned_le16(known, pos);
315 if (status->flag & RX_FLAG_SHORT_GI)
316 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
319 if (status->flag & RX_FLAG_80MHZ)
321 else if (status->flag & RX_FLAG_80P80MHZ)
322 *pos++ = 0; /* marked not known above */
323 else if (status->flag & RX_FLAG_160MHZ)
325 else if (status->flag & RX_FLAG_40MHZ)
330 *pos = (status->rate_idx << 4) | status->vht_nss;
340 if (status->vendor_radiotap_len) {
341 /* ensure 2 byte alignment for the vendor field as required */
342 if ((pos - (u8 *)rthdr) & 1)
344 *pos++ = status->vendor_radiotap_oui[0];
345 *pos++ = status->vendor_radiotap_oui[1];
346 *pos++ = status->vendor_radiotap_oui[2];
347 *pos++ = status->vendor_radiotap_subns;
348 put_unaligned_le16(status->vendor_radiotap_len, pos);
350 /* align the actual payload as requested */
351 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
357 * This function copies a received frame to all monitor interfaces and
358 * returns a cleaned-up SKB that no longer includes the FCS nor the
359 * radiotap header the driver might have added.
361 static struct sk_buff *
362 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
363 struct ieee80211_rate *rate)
365 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
366 struct ieee80211_sub_if_data *sdata;
368 struct sk_buff *skb, *skb2;
369 struct net_device *prev_dev = NULL;
370 int present_fcs_len = 0;
373 * First, we may need to make a copy of the skb because
374 * (1) we need to modify it for radiotap (if not present), and
375 * (2) the other RX handlers will modify the skb we got.
377 * We don't need to, of course, if we aren't going to return
378 * the SKB because it has a bad FCS/PLCP checksum.
381 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
382 present_fcs_len = FCS_LEN;
384 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
385 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
386 dev_kfree_skb(origskb);
390 if (!local->monitors) {
391 if (should_drop_frame(origskb, present_fcs_len)) {
392 dev_kfree_skb(origskb);
396 return remove_monitor_info(local, origskb);
399 /* room for the radiotap header based on driver features */
400 needed_headroom = ieee80211_rx_radiotap_space(local, status);
402 if (should_drop_frame(origskb, present_fcs_len)) {
403 /* only need to expand headroom if necessary */
408 * This shouldn't trigger often because most devices have an
409 * RX header they pull before we get here, and that should
410 * be big enough for our radiotap information. We should
411 * probably export the length to drivers so that we can have
412 * them allocate enough headroom to start with.
414 if (skb_headroom(skb) < needed_headroom &&
415 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
421 * Need to make a copy and possibly remove radiotap header
422 * and FCS from the original.
424 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
426 origskb = remove_monitor_info(local, origskb);
432 /* prepend radiotap information */
433 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
436 skb_reset_mac_header(skb);
437 skb->ip_summed = CHECKSUM_UNNECESSARY;
438 skb->pkt_type = PACKET_OTHERHOST;
439 skb->protocol = htons(ETH_P_802_2);
441 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
442 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
445 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
448 if (!ieee80211_sdata_running(sdata))
452 skb2 = skb_clone(skb, GFP_ATOMIC);
454 skb2->dev = prev_dev;
455 netif_receive_skb(skb2);
459 prev_dev = sdata->dev;
460 sdata->dev->stats.rx_packets++;
461 sdata->dev->stats.rx_bytes += skb->len;
466 netif_receive_skb(skb);
473 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
475 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
476 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
477 int tid, seqno_idx, security_idx;
479 /* does the frame have a qos control field? */
480 if (ieee80211_is_data_qos(hdr->frame_control)) {
481 u8 *qc = ieee80211_get_qos_ctl(hdr);
482 /* frame has qos control */
483 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
484 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
485 status->rx_flags |= IEEE80211_RX_AMSDU;
491 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
493 * Sequence numbers for management frames, QoS data
494 * frames with a broadcast/multicast address in the
495 * Address 1 field, and all non-QoS data frames sent
496 * by QoS STAs are assigned using an additional single
497 * modulo-4096 counter, [...]
499 * We also use that counter for non-QoS STAs.
501 seqno_idx = IEEE80211_NUM_TIDS;
503 if (ieee80211_is_mgmt(hdr->frame_control))
504 security_idx = IEEE80211_NUM_TIDS;
508 rx->seqno_idx = seqno_idx;
509 rx->security_idx = security_idx;
510 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
511 * For now, set skb->priority to 0 for other cases. */
512 rx->skb->priority = (tid > 7) ? 0 : tid;
516 * DOC: Packet alignment
518 * Drivers always need to pass packets that are aligned to two-byte boundaries
521 * Additionally, should, if possible, align the payload data in a way that
522 * guarantees that the contained IP header is aligned to a four-byte
523 * boundary. In the case of regular frames, this simply means aligning the
524 * payload to a four-byte boundary (because either the IP header is directly
525 * contained, or IV/RFC1042 headers that have a length divisible by four are
526 * in front of it). If the payload data is not properly aligned and the
527 * architecture doesn't support efficient unaligned operations, mac80211
528 * will align the data.
530 * With A-MSDU frames, however, the payload data address must yield two modulo
531 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
532 * push the IP header further back to a multiple of four again. Thankfully, the
533 * specs were sane enough this time around to require padding each A-MSDU
534 * subframe to a length that is a multiple of four.
536 * Padding like Atheros hardware adds which is between the 802.11 header and
537 * the payload is not supported, the driver is required to move the 802.11
538 * header to be directly in front of the payload in that case.
540 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
542 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
543 WARN_ONCE((unsigned long)rx->skb->data & 1,
544 "unaligned packet at 0x%p\n", rx->skb->data);
551 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
553 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
555 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
558 return ieee80211_is_robust_mgmt_frame(hdr);
562 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
564 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
566 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
569 return ieee80211_is_robust_mgmt_frame(hdr);
573 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
574 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
576 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
577 struct ieee80211_mmie *mmie;
579 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
582 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
583 return -1; /* not a robust management frame */
585 mmie = (struct ieee80211_mmie *)
586 (skb->data + skb->len - sizeof(*mmie));
587 if (mmie->element_id != WLAN_EID_MMIE ||
588 mmie->length != sizeof(*mmie) - 2)
591 return le16_to_cpu(mmie->key_id);
594 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
597 char *dev_addr = rx->sdata->vif.addr;
599 if (ieee80211_is_data(hdr->frame_control)) {
600 if (is_multicast_ether_addr(hdr->addr1)) {
601 if (ieee80211_has_tods(hdr->frame_control) ||
602 !ieee80211_has_fromds(hdr->frame_control))
603 return RX_DROP_MONITOR;
604 if (ether_addr_equal(hdr->addr3, dev_addr))
605 return RX_DROP_MONITOR;
607 if (!ieee80211_has_a4(hdr->frame_control))
608 return RX_DROP_MONITOR;
609 if (ether_addr_equal(hdr->addr4, dev_addr))
610 return RX_DROP_MONITOR;
614 /* If there is not an established peer link and this is not a peer link
615 * establisment frame, beacon or probe, drop the frame.
618 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
619 struct ieee80211_mgmt *mgmt;
621 if (!ieee80211_is_mgmt(hdr->frame_control))
622 return RX_DROP_MONITOR;
624 if (ieee80211_is_action(hdr->frame_control)) {
627 /* make sure category field is present */
628 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
629 return RX_DROP_MONITOR;
631 mgmt = (struct ieee80211_mgmt *)hdr;
632 category = mgmt->u.action.category;
633 if (category != WLAN_CATEGORY_MESH_ACTION &&
634 category != WLAN_CATEGORY_SELF_PROTECTED)
635 return RX_DROP_MONITOR;
639 if (ieee80211_is_probe_req(hdr->frame_control) ||
640 ieee80211_is_probe_resp(hdr->frame_control) ||
641 ieee80211_is_beacon(hdr->frame_control) ||
642 ieee80211_is_auth(hdr->frame_control))
645 return RX_DROP_MONITOR;
651 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
652 struct tid_ampdu_rx *tid_agg_rx,
654 struct sk_buff_head *frames)
656 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
657 struct ieee80211_rx_status *status;
659 lockdep_assert_held(&tid_agg_rx->reorder_lock);
664 /* release the frame from the reorder ring buffer */
665 tid_agg_rx->stored_mpdu_num--;
666 tid_agg_rx->reorder_buf[index] = NULL;
667 status = IEEE80211_SKB_RXCB(skb);
668 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
669 __skb_queue_tail(frames, skb);
672 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
675 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
676 struct tid_ampdu_rx *tid_agg_rx,
678 struct sk_buff_head *frames)
682 lockdep_assert_held(&tid_agg_rx->reorder_lock);
684 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
685 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
687 tid_agg_rx->buf_size;
688 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
694 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
695 * the skb was added to the buffer longer than this time ago, the earlier
696 * frames that have not yet been received are assumed to be lost and the skb
697 * can be released for processing. This may also release other skb's from the
698 * reorder buffer if there are no additional gaps between the frames.
700 * Callers must hold tid_agg_rx->reorder_lock.
702 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
704 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
705 struct tid_ampdu_rx *tid_agg_rx,
706 struct sk_buff_head *frames)
710 lockdep_assert_held(&tid_agg_rx->reorder_lock);
712 /* release the buffer until next missing frame */
713 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
714 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
715 if (!tid_agg_rx->reorder_buf[index] &&
716 tid_agg_rx->stored_mpdu_num) {
718 * No buffers ready to be released, but check whether any
719 * frames in the reorder buffer have timed out.
722 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
723 j = (j + 1) % tid_agg_rx->buf_size) {
724 if (!tid_agg_rx->reorder_buf[j]) {
729 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
730 HT_RX_REORDER_BUF_TIMEOUT))
731 goto set_release_timer;
733 ht_dbg_ratelimited(sdata,
734 "release an RX reorder frame due to timeout on earlier frames\n");
735 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
739 * Increment the head seq# also for the skipped slots.
741 tid_agg_rx->head_seq_num =
742 (tid_agg_rx->head_seq_num +
743 skipped) & IEEE80211_SN_MASK;
746 } else while (tid_agg_rx->reorder_buf[index]) {
747 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
749 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
751 tid_agg_rx->buf_size;
754 if (tid_agg_rx->stored_mpdu_num) {
755 j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
757 tid_agg_rx->buf_size;
759 for (; j != (index - 1) % tid_agg_rx->buf_size;
760 j = (j + 1) % tid_agg_rx->buf_size) {
761 if (tid_agg_rx->reorder_buf[j])
767 mod_timer(&tid_agg_rx->reorder_timer,
768 tid_agg_rx->reorder_time[j] + 1 +
769 HT_RX_REORDER_BUF_TIMEOUT);
771 del_timer(&tid_agg_rx->reorder_timer);
776 * As this function belongs to the RX path it must be under
777 * rcu_read_lock protection. It returns false if the frame
778 * can be processed immediately, true if it was consumed.
780 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
781 struct tid_ampdu_rx *tid_agg_rx,
783 struct sk_buff_head *frames)
785 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
786 u16 sc = le16_to_cpu(hdr->seq_ctrl);
787 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
788 u16 head_seq_num, buf_size;
792 spin_lock(&tid_agg_rx->reorder_lock);
794 buf_size = tid_agg_rx->buf_size;
795 head_seq_num = tid_agg_rx->head_seq_num;
797 /* frame with out of date sequence number */
798 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
804 * If frame the sequence number exceeds our buffering window
805 * size release some previous frames to make room for this one.
807 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
808 head_seq_num = ieee80211_sn_inc(
809 ieee80211_sn_sub(mpdu_seq_num, buf_size));
810 /* release stored frames up to new head to stack */
811 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
812 head_seq_num, frames);
815 /* Now the new frame is always in the range of the reordering buffer */
817 index = ieee80211_sn_sub(mpdu_seq_num,
818 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
820 /* check if we already stored this frame */
821 if (tid_agg_rx->reorder_buf[index]) {
827 * If the current MPDU is in the right order and nothing else
828 * is stored we can process it directly, no need to buffer it.
829 * If it is first but there's something stored, we may be able
830 * to release frames after this one.
832 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
833 tid_agg_rx->stored_mpdu_num == 0) {
834 tid_agg_rx->head_seq_num =
835 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
840 /* put the frame in the reordering buffer */
841 tid_agg_rx->reorder_buf[index] = skb;
842 tid_agg_rx->reorder_time[index] = jiffies;
843 tid_agg_rx->stored_mpdu_num++;
844 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
847 spin_unlock(&tid_agg_rx->reorder_lock);
852 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
853 * true if the MPDU was buffered, false if it should be processed.
855 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
856 struct sk_buff_head *frames)
858 struct sk_buff *skb = rx->skb;
859 struct ieee80211_local *local = rx->local;
860 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
861 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
862 struct sta_info *sta = rx->sta;
863 struct tid_ampdu_rx *tid_agg_rx;
867 if (!ieee80211_is_data_qos(hdr->frame_control) ||
868 is_multicast_ether_addr(hdr->addr1))
872 * filter the QoS data rx stream according to
873 * STA/TID and check if this STA/TID is on aggregation
879 ack_policy = *ieee80211_get_qos_ctl(hdr) &
880 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
881 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
883 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
887 /* qos null data frames are excluded */
888 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
891 /* not part of a BA session */
892 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
893 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
896 /* not actually part of this BA session */
897 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
900 /* new, potentially un-ordered, ampdu frame - process it */
902 /* reset session timer */
903 if (tid_agg_rx->timeout)
904 tid_agg_rx->last_rx = jiffies;
906 /* if this mpdu is fragmented - terminate rx aggregation session */
907 sc = le16_to_cpu(hdr->seq_ctrl);
908 if (sc & IEEE80211_SCTL_FRAG) {
909 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
910 skb_queue_tail(&rx->sdata->skb_queue, skb);
911 ieee80211_queue_work(&local->hw, &rx->sdata->work);
916 * No locking needed -- we will only ever process one
917 * RX packet at a time, and thus own tid_agg_rx. All
918 * other code manipulating it needs to (and does) make
919 * sure that we cannot get to it any more before doing
922 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
927 __skb_queue_tail(frames, skb);
930 static ieee80211_rx_result debug_noinline
931 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
933 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
934 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
937 * Drop duplicate 802.11 retransmissions
938 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
940 if (rx->skb->len >= 24 && rx->sta &&
941 !ieee80211_is_ctl(hdr->frame_control) &&
942 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
943 !is_multicast_ether_addr(hdr->addr1)) {
944 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
945 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
947 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
948 rx->local->dot11FrameDuplicateCount++;
949 rx->sta->num_duplicates++;
951 return RX_DROP_UNUSABLE;
953 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
956 if (unlikely(rx->skb->len < 16)) {
957 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
958 return RX_DROP_MONITOR;
961 /* Drop disallowed frame classes based on STA auth/assoc state;
962 * IEEE 802.11, Chap 5.5.
964 * mac80211 filters only based on association state, i.e. it drops
965 * Class 3 frames from not associated stations. hostapd sends
966 * deauth/disassoc frames when needed. In addition, hostapd is
967 * responsible for filtering on both auth and assoc states.
970 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
971 return ieee80211_rx_mesh_check(rx);
973 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
974 ieee80211_is_pspoll(hdr->frame_control)) &&
975 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
976 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
977 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
979 * accept port control frames from the AP even when it's not
980 * yet marked ASSOC to prevent a race where we don't set the
981 * assoc bit quickly enough before it sends the first frame
983 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
984 ieee80211_is_data_present(hdr->frame_control)) {
988 hdrlen = ieee80211_hdrlen(hdr->frame_control);
990 if (rx->skb->len < hdrlen + 8)
991 return RX_DROP_MONITOR;
993 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
994 if (ethertype == rx->sdata->control_port_protocol)
998 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
999 cfg80211_rx_spurious_frame(rx->sdata->dev,
1002 return RX_DROP_UNUSABLE;
1004 return RX_DROP_MONITOR;
1011 static ieee80211_rx_result debug_noinline
1012 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1014 struct sk_buff *skb = rx->skb;
1015 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1016 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1019 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1020 struct ieee80211_key *sta_ptk = NULL;
1021 int mmie_keyidx = -1;
1027 * There are four types of keys:
1028 * - GTK (group keys)
1029 * - IGTK (group keys for management frames)
1030 * - PTK (pairwise keys)
1031 * - STK (station-to-station pairwise keys)
1033 * When selecting a key, we have to distinguish between multicast
1034 * (including broadcast) and unicast frames, the latter can only
1035 * use PTKs and STKs while the former always use GTKs and IGTKs.
1036 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1037 * unicast frames can also use key indices like GTKs. Hence, if we
1038 * don't have a PTK/STK we check the key index for a WEP key.
1040 * Note that in a regular BSS, multicast frames are sent by the
1041 * AP only, associated stations unicast the frame to the AP first
1042 * which then multicasts it on their behalf.
1044 * There is also a slight problem in IBSS mode: GTKs are negotiated
1045 * with each station, that is something we don't currently handle.
1046 * The spec seems to expect that one negotiates the same key with
1047 * every station but there's no such requirement; VLANs could be
1052 * No point in finding a key and decrypting if the frame is neither
1053 * addressed to us nor a multicast frame.
1055 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1058 /* start without a key */
1062 sta_ptk = rcu_dereference(rx->sta->ptk);
1064 fc = hdr->frame_control;
1066 if (!ieee80211_has_protected(fc))
1067 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1069 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1071 if ((status->flag & RX_FLAG_DECRYPTED) &&
1072 (status->flag & RX_FLAG_IV_STRIPPED))
1074 /* Skip decryption if the frame is not protected. */
1075 if (!ieee80211_has_protected(fc))
1077 } else if (mmie_keyidx >= 0) {
1078 /* Broadcast/multicast robust management frame / BIP */
1079 if ((status->flag & RX_FLAG_DECRYPTED) &&
1080 (status->flag & RX_FLAG_IV_STRIPPED))
1083 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1084 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1085 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1087 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1089 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1090 } else if (!ieee80211_has_protected(fc)) {
1092 * The frame was not protected, so skip decryption. However, we
1093 * need to set rx->key if there is a key that could have been
1094 * used so that the frame may be dropped if encryption would
1095 * have been expected.
1097 struct ieee80211_key *key = NULL;
1098 struct ieee80211_sub_if_data *sdata = rx->sdata;
1101 if (ieee80211_is_mgmt(fc) &&
1102 is_multicast_ether_addr(hdr->addr1) &&
1103 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1107 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1108 key = rcu_dereference(rx->sta->gtk[i]);
1114 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1115 key = rcu_dereference(sdata->keys[i]);
1127 * The device doesn't give us the IV so we won't be
1128 * able to look up the key. That's ok though, we
1129 * don't need to decrypt the frame, we just won't
1130 * be able to keep statistics accurate.
1131 * Except for key threshold notifications, should
1132 * we somehow allow the driver to tell us which key
1133 * the hardware used if this flag is set?
1135 if ((status->flag & RX_FLAG_DECRYPTED) &&
1136 (status->flag & RX_FLAG_IV_STRIPPED))
1139 hdrlen = ieee80211_hdrlen(fc);
1141 if (rx->skb->len < 8 + hdrlen)
1142 return RX_DROP_UNUSABLE; /* TODO: count this? */
1145 * no need to call ieee80211_wep_get_keyidx,
1146 * it verifies a bunch of things we've done already
1148 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1149 keyidx = keyid >> 6;
1151 /* check per-station GTK first, if multicast packet */
1152 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1153 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1155 /* if not found, try default key */
1157 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1160 * RSNA-protected unicast frames should always be
1161 * sent with pairwise or station-to-station keys,
1162 * but for WEP we allow using a key index as well.
1165 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1166 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1167 !is_multicast_ether_addr(hdr->addr1))
1173 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1174 return RX_DROP_MONITOR;
1176 rx->key->tx_rx_count++;
1177 /* TODO: add threshold stuff again */
1179 return RX_DROP_MONITOR;
1182 switch (rx->key->conf.cipher) {
1183 case WLAN_CIPHER_SUITE_WEP40:
1184 case WLAN_CIPHER_SUITE_WEP104:
1185 result = ieee80211_crypto_wep_decrypt(rx);
1187 case WLAN_CIPHER_SUITE_TKIP:
1188 result = ieee80211_crypto_tkip_decrypt(rx);
1190 case WLAN_CIPHER_SUITE_CCMP:
1191 result = ieee80211_crypto_ccmp_decrypt(rx);
1193 case WLAN_CIPHER_SUITE_AES_CMAC:
1194 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1198 * We can reach here only with HW-only algorithms
1199 * but why didn't it decrypt the frame?!
1201 return RX_DROP_UNUSABLE;
1204 /* the hdr variable is invalid after the decrypt handlers */
1206 /* either the frame has been decrypted or will be dropped */
1207 status->flag |= RX_FLAG_DECRYPTED;
1212 static ieee80211_rx_result debug_noinline
1213 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1215 struct ieee80211_local *local;
1216 struct ieee80211_hdr *hdr;
1217 struct sk_buff *skb;
1221 hdr = (struct ieee80211_hdr *) skb->data;
1223 if (!local->pspolling)
1226 if (!ieee80211_has_fromds(hdr->frame_control))
1227 /* this is not from AP */
1230 if (!ieee80211_is_data(hdr->frame_control))
1233 if (!ieee80211_has_moredata(hdr->frame_control)) {
1234 /* AP has no more frames buffered for us */
1235 local->pspolling = false;
1239 /* more data bit is set, let's request a new frame from the AP */
1240 ieee80211_send_pspoll(local, rx->sdata);
1245 static void sta_ps_start(struct sta_info *sta)
1247 struct ieee80211_sub_if_data *sdata = sta->sdata;
1248 struct ieee80211_local *local = sdata->local;
1251 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1252 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1253 ps = &sdata->bss->ps;
1257 atomic_inc(&ps->num_sta_ps);
1258 set_sta_flag(sta, WLAN_STA_PS_STA);
1259 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1260 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1261 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1262 sta->sta.addr, sta->sta.aid);
1265 static void sta_ps_end(struct sta_info *sta)
1267 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1268 sta->sta.addr, sta->sta.aid);
1270 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1271 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1272 sta->sta.addr, sta->sta.aid);
1276 ieee80211_sta_ps_deliver_wakeup(sta);
1279 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1281 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1284 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1286 /* Don't let the same PS state be set twice */
1287 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1288 if ((start && in_ps) || (!start && !in_ps))
1292 sta_ps_start(sta_inf);
1294 sta_ps_end(sta_inf);
1298 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1300 static ieee80211_rx_result debug_noinline
1301 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1303 struct ieee80211_sub_if_data *sdata = rx->sdata;
1304 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1305 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1308 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1311 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1312 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1316 * The device handles station powersave, so don't do anything about
1317 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1318 * it to mac80211 since they're handled.)
1320 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1324 * Don't do anything if the station isn't already asleep. In
1325 * the uAPSD case, the station will probably be marked asleep,
1326 * in the PS-Poll case the station must be confused ...
1328 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1331 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1332 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1333 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1334 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1336 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1339 /* Free PS Poll skb here instead of returning RX_DROP that would
1340 * count as an dropped frame. */
1341 dev_kfree_skb(rx->skb);
1344 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1345 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1346 ieee80211_has_pm(hdr->frame_control) &&
1347 (ieee80211_is_data_qos(hdr->frame_control) ||
1348 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1349 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1350 ac = ieee802_1d_to_ac[tid & 7];
1353 * If this AC is not trigger-enabled do nothing.
1355 * NB: This could/should check a separate bitmap of trigger-
1356 * enabled queues, but for now we only implement uAPSD w/o
1357 * TSPEC changes to the ACs, so they're always the same.
1359 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1362 /* if we are in a service period, do nothing */
1363 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1366 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1367 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1369 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1375 static ieee80211_rx_result debug_noinline
1376 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1378 struct sta_info *sta = rx->sta;
1379 struct sk_buff *skb = rx->skb;
1380 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1381 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1387 * Update last_rx only for IBSS packets which are for the current
1388 * BSSID and for station already AUTHORIZED to avoid keeping the
1389 * current IBSS network alive in cases where other STAs start
1390 * using different BSSID. This will also give the station another
1391 * chance to restart the authentication/authorization in case
1392 * something went wrong the first time.
1394 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1395 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1396 NL80211_IFTYPE_ADHOC);
1397 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1398 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1399 sta->last_rx = jiffies;
1400 if (ieee80211_is_data(hdr->frame_control)) {
1401 sta->last_rx_rate_idx = status->rate_idx;
1402 sta->last_rx_rate_flag = status->flag;
1403 sta->last_rx_rate_vht_nss = status->vht_nss;
1406 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1408 * Mesh beacons will update last_rx when if they are found to
1409 * match the current local configuration when processed.
1411 sta->last_rx = jiffies;
1412 if (ieee80211_is_data(hdr->frame_control)) {
1413 sta->last_rx_rate_idx = status->rate_idx;
1414 sta->last_rx_rate_flag = status->flag;
1415 sta->last_rx_rate_vht_nss = status->vht_nss;
1419 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1422 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1423 ieee80211_sta_rx_notify(rx->sdata, hdr);
1425 sta->rx_fragments++;
1426 sta->rx_bytes += rx->skb->len;
1427 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1428 sta->last_signal = status->signal;
1429 ewma_add(&sta->avg_signal, -status->signal);
1433 * Change STA power saving mode only at the end of a frame
1434 * exchange sequence.
1436 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1437 !ieee80211_has_morefrags(hdr->frame_control) &&
1438 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1439 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1440 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1441 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1443 * Ignore doze->wake transitions that are
1444 * indicated by non-data frames, the standard
1445 * is unclear here, but for example going to
1446 * PS mode and then scanning would cause a
1447 * doze->wake transition for the probe request,
1448 * and that is clearly undesirable.
1450 if (ieee80211_is_data(hdr->frame_control) &&
1451 !ieee80211_has_pm(hdr->frame_control))
1454 if (ieee80211_has_pm(hdr->frame_control))
1459 /* mesh power save support */
1460 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1461 ieee80211_mps_rx_h_sta_process(sta, hdr);
1464 * Drop (qos-)data::nullfunc frames silently, since they
1465 * are used only to control station power saving mode.
1467 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1468 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1469 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1472 * If we receive a 4-addr nullfunc frame from a STA
1473 * that was not moved to a 4-addr STA vlan yet send
1474 * the event to userspace and for older hostapd drop
1475 * the frame to the monitor interface.
1477 if (ieee80211_has_a4(hdr->frame_control) &&
1478 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1479 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1480 !rx->sdata->u.vlan.sta))) {
1481 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1482 cfg80211_rx_unexpected_4addr_frame(
1483 rx->sdata->dev, sta->sta.addr,
1485 return RX_DROP_MONITOR;
1488 * Update counter and free packet here to avoid
1489 * counting this as a dropped packed.
1492 dev_kfree_skb(rx->skb);
1497 } /* ieee80211_rx_h_sta_process */
1499 static inline struct ieee80211_fragment_entry *
1500 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1501 unsigned int frag, unsigned int seq, int rx_queue,
1502 struct sk_buff **skb)
1504 struct ieee80211_fragment_entry *entry;
1506 entry = &sdata->fragments[sdata->fragment_next++];
1507 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1508 sdata->fragment_next = 0;
1510 if (!skb_queue_empty(&entry->skb_list))
1511 __skb_queue_purge(&entry->skb_list);
1513 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1515 entry->first_frag_time = jiffies;
1517 entry->rx_queue = rx_queue;
1518 entry->last_frag = frag;
1520 entry->extra_len = 0;
1525 static inline struct ieee80211_fragment_entry *
1526 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1527 unsigned int frag, unsigned int seq,
1528 int rx_queue, struct ieee80211_hdr *hdr)
1530 struct ieee80211_fragment_entry *entry;
1533 idx = sdata->fragment_next;
1534 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1535 struct ieee80211_hdr *f_hdr;
1539 idx = IEEE80211_FRAGMENT_MAX - 1;
1541 entry = &sdata->fragments[idx];
1542 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1543 entry->rx_queue != rx_queue ||
1544 entry->last_frag + 1 != frag)
1547 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1550 * Check ftype and addresses are equal, else check next fragment
1552 if (((hdr->frame_control ^ f_hdr->frame_control) &
1553 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1554 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1555 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1558 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1559 __skb_queue_purge(&entry->skb_list);
1568 static ieee80211_rx_result debug_noinline
1569 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1571 struct ieee80211_hdr *hdr;
1574 unsigned int frag, seq;
1575 struct ieee80211_fragment_entry *entry;
1576 struct sk_buff *skb;
1577 struct ieee80211_rx_status *status;
1579 hdr = (struct ieee80211_hdr *)rx->skb->data;
1580 fc = hdr->frame_control;
1582 if (ieee80211_is_ctl(fc))
1585 sc = le16_to_cpu(hdr->seq_ctrl);
1586 frag = sc & IEEE80211_SCTL_FRAG;
1588 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1589 is_multicast_ether_addr(hdr->addr1))) {
1590 /* not fragmented */
1593 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1595 if (skb_linearize(rx->skb))
1596 return RX_DROP_UNUSABLE;
1599 * skb_linearize() might change the skb->data and
1600 * previously cached variables (in this case, hdr) need to
1601 * be refreshed with the new data.
1603 hdr = (struct ieee80211_hdr *)rx->skb->data;
1604 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1607 /* This is the first fragment of a new frame. */
1608 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1609 rx->seqno_idx, &(rx->skb));
1610 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1611 ieee80211_has_protected(fc)) {
1612 int queue = rx->security_idx;
1613 /* Store CCMP PN so that we can verify that the next
1614 * fragment has a sequential PN value. */
1616 memcpy(entry->last_pn,
1617 rx->key->u.ccmp.rx_pn[queue],
1623 /* This is a fragment for a frame that should already be pending in
1624 * fragment cache. Add this fragment to the end of the pending entry.
1626 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1627 rx->seqno_idx, hdr);
1629 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1630 return RX_DROP_MONITOR;
1633 /* Verify that MPDUs within one MSDU have sequential PN values.
1634 * (IEEE 802.11i, 8.3.3.4.5) */
1637 u8 pn[CCMP_PN_LEN], *rpn;
1639 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1640 return RX_DROP_UNUSABLE;
1641 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1642 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1647 queue = rx->security_idx;
1648 rpn = rx->key->u.ccmp.rx_pn[queue];
1649 if (memcmp(pn, rpn, CCMP_PN_LEN))
1650 return RX_DROP_UNUSABLE;
1651 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1654 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1655 __skb_queue_tail(&entry->skb_list, rx->skb);
1656 entry->last_frag = frag;
1657 entry->extra_len += rx->skb->len;
1658 if (ieee80211_has_morefrags(fc)) {
1663 rx->skb = __skb_dequeue(&entry->skb_list);
1664 if (skb_tailroom(rx->skb) < entry->extra_len) {
1665 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1666 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1668 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1669 __skb_queue_purge(&entry->skb_list);
1670 return RX_DROP_UNUSABLE;
1673 while ((skb = __skb_dequeue(&entry->skb_list))) {
1674 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1678 /* Complete frame has been reassembled - process it now */
1679 status = IEEE80211_SKB_RXCB(rx->skb);
1680 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1684 rx->sta->rx_packets++;
1685 if (is_multicast_ether_addr(hdr->addr1))
1686 rx->local->dot11MulticastReceivedFrameCount++;
1688 ieee80211_led_rx(rx->local);
1692 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1694 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1700 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1702 struct sk_buff *skb = rx->skb;
1703 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1706 * Pass through unencrypted frames if the hardware has
1707 * decrypted them already.
1709 if (status->flag & RX_FLAG_DECRYPTED)
1712 /* Drop unencrypted frames if key is set. */
1713 if (unlikely(!ieee80211_has_protected(fc) &&
1714 !ieee80211_is_nullfunc(fc) &&
1715 ieee80211_is_data(fc) &&
1716 (rx->key || rx->sdata->drop_unencrypted)))
1722 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1724 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1725 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1726 __le16 fc = hdr->frame_control;
1729 * Pass through unencrypted frames if the hardware has
1730 * decrypted them already.
1732 if (status->flag & RX_FLAG_DECRYPTED)
1735 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1736 if (unlikely(!ieee80211_has_protected(fc) &&
1737 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1739 if (ieee80211_is_deauth(fc))
1740 cfg80211_send_unprot_deauth(rx->sdata->dev,
1743 else if (ieee80211_is_disassoc(fc))
1744 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1749 /* BIP does not use Protected field, so need to check MMIE */
1750 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1751 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1752 if (ieee80211_is_deauth(fc))
1753 cfg80211_send_unprot_deauth(rx->sdata->dev,
1756 else if (ieee80211_is_disassoc(fc))
1757 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1763 * When using MFP, Action frames are not allowed prior to
1764 * having configured keys.
1766 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1767 ieee80211_is_robust_mgmt_frame(
1768 (struct ieee80211_hdr *) rx->skb->data)))
1776 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1778 struct ieee80211_sub_if_data *sdata = rx->sdata;
1779 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1780 bool check_port_control = false;
1781 struct ethhdr *ehdr;
1784 *port_control = false;
1785 if (ieee80211_has_a4(hdr->frame_control) &&
1786 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1789 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1790 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1792 if (!sdata->u.mgd.use_4addr)
1795 check_port_control = true;
1798 if (is_multicast_ether_addr(hdr->addr1) &&
1799 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1802 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1806 ehdr = (struct ethhdr *) rx->skb->data;
1807 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1808 *port_control = true;
1809 else if (check_port_control)
1816 * requires that rx->skb is a frame with ethernet header
1818 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1820 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1821 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1822 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1825 * Allow EAPOL frames to us/the PAE group address regardless
1826 * of whether the frame was encrypted or not.
1828 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1829 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1830 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1833 if (ieee80211_802_1x_port_control(rx) ||
1834 ieee80211_drop_unencrypted(rx, fc))
1841 * requires that rx->skb is a frame with ethernet header
1844 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1846 struct ieee80211_sub_if_data *sdata = rx->sdata;
1847 struct net_device *dev = sdata->dev;
1848 struct sk_buff *skb, *xmit_skb;
1849 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1850 struct sta_info *dsta;
1851 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1856 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1857 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1858 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1859 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1860 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1861 if (is_multicast_ether_addr(ehdr->h_dest)) {
1863 * send multicast frames both to higher layers in
1864 * local net stack and back to the wireless medium
1866 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1868 net_info_ratelimited("%s: failed to clone multicast frame\n",
1871 dsta = sta_info_get(sdata, skb->data);
1874 * The destination station is associated to
1875 * this AP (in this VLAN), so send the frame
1876 * directly to it and do not pass it to local
1886 int align __maybe_unused;
1888 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1890 * 'align' will only take the values 0 or 2 here
1891 * since all frames are required to be aligned
1892 * to 2-byte boundaries when being passed to
1893 * mac80211; the code here works just as well if
1894 * that isn't true, but mac80211 assumes it can
1895 * access fields as 2-byte aligned (e.g. for
1896 * compare_ether_addr)
1898 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1900 if (WARN_ON(skb_headroom(skb) < 3)) {
1904 u8 *data = skb->data;
1905 size_t len = skb_headlen(skb);
1907 memmove(skb->data, data, len);
1908 skb_set_tail_pointer(skb, len);
1914 /* deliver to local stack */
1915 skb->protocol = eth_type_trans(skb, dev);
1916 memset(skb->cb, 0, sizeof(skb->cb));
1917 netif_receive_skb(skb);
1923 * Send to wireless media and increase priority by 256 to
1924 * keep the received priority instead of reclassifying
1925 * the frame (see cfg80211_classify8021d).
1927 xmit_skb->priority += 256;
1928 xmit_skb->protocol = htons(ETH_P_802_3);
1929 skb_reset_network_header(xmit_skb);
1930 skb_reset_mac_header(xmit_skb);
1931 dev_queue_xmit(xmit_skb);
1935 static ieee80211_rx_result debug_noinline
1936 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1938 struct net_device *dev = rx->sdata->dev;
1939 struct sk_buff *skb = rx->skb;
1940 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1941 __le16 fc = hdr->frame_control;
1942 struct sk_buff_head frame_list;
1943 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1945 if (unlikely(!ieee80211_is_data(fc)))
1948 if (unlikely(!ieee80211_is_data_present(fc)))
1949 return RX_DROP_MONITOR;
1951 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1954 if (ieee80211_has_a4(hdr->frame_control) &&
1955 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1956 !rx->sdata->u.vlan.sta)
1957 return RX_DROP_UNUSABLE;
1959 if (is_multicast_ether_addr(hdr->addr1) &&
1960 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1961 rx->sdata->u.vlan.sta) ||
1962 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1963 rx->sdata->u.mgd.use_4addr)))
1964 return RX_DROP_UNUSABLE;
1967 __skb_queue_head_init(&frame_list);
1969 if (skb_linearize(skb))
1970 return RX_DROP_UNUSABLE;
1972 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1973 rx->sdata->vif.type,
1974 rx->local->hw.extra_tx_headroom, true);
1976 while (!skb_queue_empty(&frame_list)) {
1977 rx->skb = __skb_dequeue(&frame_list);
1979 if (!ieee80211_frame_allowed(rx, fc)) {
1980 dev_kfree_skb(rx->skb);
1983 dev->stats.rx_packets++;
1984 dev->stats.rx_bytes += rx->skb->len;
1986 ieee80211_deliver_skb(rx);
1992 #ifdef CONFIG_MAC80211_MESH
1993 static ieee80211_rx_result
1994 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1996 struct ieee80211_hdr *fwd_hdr, *hdr;
1997 struct ieee80211_tx_info *info;
1998 struct ieee80211s_hdr *mesh_hdr;
1999 struct sk_buff *skb = rx->skb, *fwd_skb;
2000 struct ieee80211_local *local = rx->local;
2001 struct ieee80211_sub_if_data *sdata = rx->sdata;
2002 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2003 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2004 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
2007 hdr = (struct ieee80211_hdr *) skb->data;
2008 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2010 /* make sure fixed part of mesh header is there, also checks skb len */
2011 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2012 return RX_DROP_MONITOR;
2014 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2016 /* make sure full mesh header is there, also checks skb len */
2017 if (!pskb_may_pull(rx->skb,
2018 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2019 return RX_DROP_MONITOR;
2021 /* reload pointers */
2022 hdr = (struct ieee80211_hdr *) skb->data;
2023 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2025 /* frame is in RMC, don't forward */
2026 if (ieee80211_is_data(hdr->frame_control) &&
2027 is_multicast_ether_addr(hdr->addr1) &&
2028 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2029 return RX_DROP_MONITOR;
2031 if (!ieee80211_is_data(hdr->frame_control) ||
2032 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2036 return RX_DROP_MONITOR;
2038 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2039 struct mesh_path *mppath;
2043 if (is_multicast_ether_addr(hdr->addr1)) {
2044 mpp_addr = hdr->addr3;
2045 proxied_addr = mesh_hdr->eaddr1;
2046 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2047 /* has_a4 already checked in ieee80211_rx_mesh_check */
2048 mpp_addr = hdr->addr4;
2049 proxied_addr = mesh_hdr->eaddr2;
2051 return RX_DROP_MONITOR;
2055 mppath = mpp_path_lookup(sdata, proxied_addr);
2057 mpp_path_add(sdata, proxied_addr, mpp_addr);
2059 spin_lock_bh(&mppath->state_lock);
2060 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2061 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2062 spin_unlock_bh(&mppath->state_lock);
2067 /* Frame has reached destination. Don't forward */
2068 if (!is_multicast_ether_addr(hdr->addr1) &&
2069 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2072 q = ieee80211_select_queue_80211(sdata, skb, hdr);
2073 if (ieee80211_queue_stopped(&local->hw, q)) {
2074 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2075 return RX_DROP_MONITOR;
2077 skb_set_queue_mapping(skb, q);
2079 if (!--mesh_hdr->ttl) {
2080 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2084 if (!ifmsh->mshcfg.dot11MeshForwarding)
2087 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2089 net_info_ratelimited("%s: failed to clone mesh frame\n",
2094 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2095 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2096 info = IEEE80211_SKB_CB(fwd_skb);
2097 memset(info, 0, sizeof(*info));
2098 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2099 info->control.vif = &rx->sdata->vif;
2100 info->control.jiffies = jiffies;
2101 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2102 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2103 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2104 /* update power mode indication when forwarding */
2105 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2106 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2107 /* mesh power mode flags updated in mesh_nexthop_lookup */
2108 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2110 /* unable to resolve next hop */
2111 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2112 fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
2113 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2115 return RX_DROP_MONITOR;
2118 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2119 ieee80211_add_pending_skb(local, fwd_skb);
2121 if (is_multicast_ether_addr(hdr->addr1) ||
2122 sdata->dev->flags & IFF_PROMISC)
2125 return RX_DROP_MONITOR;
2129 static ieee80211_rx_result debug_noinline
2130 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2132 struct ieee80211_sub_if_data *sdata = rx->sdata;
2133 struct ieee80211_local *local = rx->local;
2134 struct net_device *dev = sdata->dev;
2135 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2136 __le16 fc = hdr->frame_control;
2140 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2143 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2144 return RX_DROP_MONITOR;
2147 * Send unexpected-4addr-frame event to hostapd. For older versions,
2148 * also drop the frame to cooked monitor interfaces.
2150 if (ieee80211_has_a4(hdr->frame_control) &&
2151 sdata->vif.type == NL80211_IFTYPE_AP) {
2153 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2154 cfg80211_rx_unexpected_4addr_frame(
2155 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2156 return RX_DROP_MONITOR;
2159 err = __ieee80211_data_to_8023(rx, &port_control);
2161 return RX_DROP_UNUSABLE;
2163 if (!ieee80211_frame_allowed(rx, fc))
2164 return RX_DROP_MONITOR;
2166 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2167 unlikely(port_control) && sdata->bss) {
2168 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2176 dev->stats.rx_packets++;
2177 dev->stats.rx_bytes += rx->skb->len;
2179 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2180 !is_multicast_ether_addr(
2181 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2182 (!local->scanning &&
2183 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2184 mod_timer(&local->dynamic_ps_timer, jiffies +
2185 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2188 ieee80211_deliver_skb(rx);
2193 static ieee80211_rx_result debug_noinline
2194 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2196 struct sk_buff *skb = rx->skb;
2197 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2198 struct tid_ampdu_rx *tid_agg_rx;
2202 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2205 if (ieee80211_is_back_req(bar->frame_control)) {
2207 __le16 control, start_seq_num;
2208 } __packed bar_data;
2211 return RX_DROP_MONITOR;
2213 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2214 &bar_data, sizeof(bar_data)))
2215 return RX_DROP_MONITOR;
2217 tid = le16_to_cpu(bar_data.control) >> 12;
2219 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2221 return RX_DROP_MONITOR;
2223 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2225 /* reset session timer */
2226 if (tid_agg_rx->timeout)
2227 mod_timer(&tid_agg_rx->session_timer,
2228 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2230 spin_lock(&tid_agg_rx->reorder_lock);
2231 /* release stored frames up to start of BAR */
2232 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2233 start_seq_num, frames);
2234 spin_unlock(&tid_agg_rx->reorder_lock);
2241 * After this point, we only want management frames,
2242 * so we can drop all remaining control frames to
2243 * cooked monitor interfaces.
2245 return RX_DROP_MONITOR;
2248 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2249 struct ieee80211_mgmt *mgmt,
2252 struct ieee80211_local *local = sdata->local;
2253 struct sk_buff *skb;
2254 struct ieee80211_mgmt *resp;
2256 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2257 /* Not to own unicast address */
2261 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2262 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2263 /* Not from the current AP or not associated yet. */
2267 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2268 /* Too short SA Query request frame */
2272 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2276 skb_reserve(skb, local->hw.extra_tx_headroom);
2277 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2278 memset(resp, 0, 24);
2279 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2280 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2281 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2282 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2283 IEEE80211_STYPE_ACTION);
2284 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2285 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2286 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2287 memcpy(resp->u.action.u.sa_query.trans_id,
2288 mgmt->u.action.u.sa_query.trans_id,
2289 WLAN_SA_QUERY_TR_ID_LEN);
2291 ieee80211_tx_skb(sdata, skb);
2294 static ieee80211_rx_result debug_noinline
2295 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2297 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2298 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2301 * From here on, look only at management frames.
2302 * Data and control frames are already handled,
2303 * and unknown (reserved) frames are useless.
2305 if (rx->skb->len < 24)
2306 return RX_DROP_MONITOR;
2308 if (!ieee80211_is_mgmt(mgmt->frame_control))
2309 return RX_DROP_MONITOR;
2311 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2312 ieee80211_is_beacon(mgmt->frame_control) &&
2313 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2316 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2317 sig = status->signal;
2319 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2320 rx->skb->data, rx->skb->len,
2322 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2325 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2326 return RX_DROP_MONITOR;
2328 if (ieee80211_drop_unencrypted_mgmt(rx))
2329 return RX_DROP_UNUSABLE;
2334 static ieee80211_rx_result debug_noinline
2335 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2337 struct ieee80211_local *local = rx->local;
2338 struct ieee80211_sub_if_data *sdata = rx->sdata;
2339 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2340 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2341 int len = rx->skb->len;
2343 if (!ieee80211_is_action(mgmt->frame_control))
2346 /* drop too small frames */
2347 if (len < IEEE80211_MIN_ACTION_SIZE)
2348 return RX_DROP_UNUSABLE;
2350 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2351 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
2352 return RX_DROP_UNUSABLE;
2354 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2355 return RX_DROP_UNUSABLE;
2357 switch (mgmt->u.action.category) {
2358 case WLAN_CATEGORY_HT:
2359 /* reject HT action frames from stations not supporting HT */
2360 if (!rx->sta->sta.ht_cap.ht_supported)
2363 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2364 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2365 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2366 sdata->vif.type != NL80211_IFTYPE_AP &&
2367 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2370 /* verify action & smps_control/chanwidth are present */
2371 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2374 switch (mgmt->u.action.u.ht_smps.action) {
2375 case WLAN_HT_ACTION_SMPS: {
2376 struct ieee80211_supported_band *sband;
2377 enum ieee80211_smps_mode smps_mode;
2379 /* convert to HT capability */
2380 switch (mgmt->u.action.u.ht_smps.smps_control) {
2381 case WLAN_HT_SMPS_CONTROL_DISABLED:
2382 smps_mode = IEEE80211_SMPS_OFF;
2384 case WLAN_HT_SMPS_CONTROL_STATIC:
2385 smps_mode = IEEE80211_SMPS_STATIC;
2387 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2388 smps_mode = IEEE80211_SMPS_DYNAMIC;
2394 /* if no change do nothing */
2395 if (rx->sta->sta.smps_mode == smps_mode)
2397 rx->sta->sta.smps_mode = smps_mode;
2399 sband = rx->local->hw.wiphy->bands[status->band];
2401 rate_control_rate_update(local, sband, rx->sta,
2402 IEEE80211_RC_SMPS_CHANGED);
2405 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2406 struct ieee80211_supported_band *sband;
2407 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2408 enum ieee80211_sta_rx_bandwidth new_bw;
2410 /* If it doesn't support 40 MHz it can't change ... */
2411 if (!(rx->sta->sta.ht_cap.cap &
2412 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2415 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2416 new_bw = IEEE80211_STA_RX_BW_20;
2418 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2420 if (rx->sta->sta.bandwidth == new_bw)
2423 sband = rx->local->hw.wiphy->bands[status->band];
2425 rate_control_rate_update(local, sband, rx->sta,
2426 IEEE80211_RC_BW_CHANGED);
2434 case WLAN_CATEGORY_PUBLIC:
2435 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2437 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2441 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2443 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2444 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2446 if (len < offsetof(struct ieee80211_mgmt,
2447 u.action.u.ext_chan_switch.variable))
2450 case WLAN_CATEGORY_VHT:
2451 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2452 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2453 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2454 sdata->vif.type != NL80211_IFTYPE_AP &&
2455 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2458 /* verify action code is present */
2459 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2462 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2463 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2466 /* verify opmode is present */
2467 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2470 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2472 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2473 opmode, status->band,
2481 case WLAN_CATEGORY_BACK:
2482 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2483 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2484 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2485 sdata->vif.type != NL80211_IFTYPE_AP &&
2486 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2489 /* verify action_code is present */
2490 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2493 switch (mgmt->u.action.u.addba_req.action_code) {
2494 case WLAN_ACTION_ADDBA_REQ:
2495 if (len < (IEEE80211_MIN_ACTION_SIZE +
2496 sizeof(mgmt->u.action.u.addba_req)))
2499 case WLAN_ACTION_ADDBA_RESP:
2500 if (len < (IEEE80211_MIN_ACTION_SIZE +
2501 sizeof(mgmt->u.action.u.addba_resp)))
2504 case WLAN_ACTION_DELBA:
2505 if (len < (IEEE80211_MIN_ACTION_SIZE +
2506 sizeof(mgmt->u.action.u.delba)))
2514 case WLAN_CATEGORY_SPECTRUM_MGMT:
2515 if (status->band != IEEE80211_BAND_5GHZ)
2518 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2521 /* verify action_code is present */
2522 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2525 switch (mgmt->u.action.u.measurement.action_code) {
2526 case WLAN_ACTION_SPCT_MSR_REQ:
2527 if (len < (IEEE80211_MIN_ACTION_SIZE +
2528 sizeof(mgmt->u.action.u.measurement)))
2530 ieee80211_process_measurement_req(sdata, mgmt, len);
2532 case WLAN_ACTION_SPCT_CHL_SWITCH:
2533 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2536 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2542 case WLAN_CATEGORY_SA_QUERY:
2543 if (len < (IEEE80211_MIN_ACTION_SIZE +
2544 sizeof(mgmt->u.action.u.sa_query)))
2547 switch (mgmt->u.action.u.sa_query.action) {
2548 case WLAN_ACTION_SA_QUERY_REQUEST:
2549 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2551 ieee80211_process_sa_query_req(sdata, mgmt, len);
2555 case WLAN_CATEGORY_SELF_PROTECTED:
2556 if (len < (IEEE80211_MIN_ACTION_SIZE +
2557 sizeof(mgmt->u.action.u.self_prot.action_code)))
2560 switch (mgmt->u.action.u.self_prot.action_code) {
2561 case WLAN_SP_MESH_PEERING_OPEN:
2562 case WLAN_SP_MESH_PEERING_CLOSE:
2563 case WLAN_SP_MESH_PEERING_CONFIRM:
2564 if (!ieee80211_vif_is_mesh(&sdata->vif))
2566 if (sdata->u.mesh.user_mpm)
2567 /* userspace handles this frame */
2570 case WLAN_SP_MGK_INFORM:
2571 case WLAN_SP_MGK_ACK:
2572 if (!ieee80211_vif_is_mesh(&sdata->vif))
2577 case WLAN_CATEGORY_MESH_ACTION:
2578 if (len < (IEEE80211_MIN_ACTION_SIZE +
2579 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2582 if (!ieee80211_vif_is_mesh(&sdata->vif))
2584 if (mesh_action_is_path_sel(mgmt) &&
2585 !mesh_path_sel_is_hwmp(sdata))
2593 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2594 /* will return in the next handlers */
2599 rx->sta->rx_packets++;
2600 dev_kfree_skb(rx->skb);
2604 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2605 skb_queue_tail(&sdata->skb_queue, rx->skb);
2606 ieee80211_queue_work(&local->hw, &sdata->work);
2608 rx->sta->rx_packets++;
2612 static ieee80211_rx_result debug_noinline
2613 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2615 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2618 /* skip known-bad action frames and return them in the next handler */
2619 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2623 * Getting here means the kernel doesn't know how to handle
2624 * it, but maybe userspace does ... include returned frames
2625 * so userspace can register for those to know whether ones
2626 * it transmitted were processed or returned.
2629 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2630 sig = status->signal;
2632 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2633 rx->skb->data, rx->skb->len,
2636 rx->sta->rx_packets++;
2637 dev_kfree_skb(rx->skb);
2644 static ieee80211_rx_result debug_noinline
2645 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2647 struct ieee80211_local *local = rx->local;
2648 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2649 struct sk_buff *nskb;
2650 struct ieee80211_sub_if_data *sdata = rx->sdata;
2651 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2653 if (!ieee80211_is_action(mgmt->frame_control))
2657 * For AP mode, hostapd is responsible for handling any action
2658 * frames that we didn't handle, including returning unknown
2659 * ones. For all other modes we will return them to the sender,
2660 * setting the 0x80 bit in the action category, as required by
2661 * 802.11-2012 9.24.4.
2662 * Newer versions of hostapd shall also use the management frame
2663 * registration mechanisms, but older ones still use cooked
2664 * monitor interfaces so push all frames there.
2666 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2667 (sdata->vif.type == NL80211_IFTYPE_AP ||
2668 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2669 return RX_DROP_MONITOR;
2671 if (is_multicast_ether_addr(mgmt->da))
2672 return RX_DROP_MONITOR;
2674 /* do not return rejected action frames */
2675 if (mgmt->u.action.category & 0x80)
2676 return RX_DROP_UNUSABLE;
2678 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2681 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2683 nmgmt->u.action.category |= 0x80;
2684 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2685 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2687 memset(nskb->cb, 0, sizeof(nskb->cb));
2689 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2690 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2692 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2693 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2694 IEEE80211_TX_CTL_NO_CCK_RATE;
2695 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2697 local->hw.offchannel_tx_hw_queue;
2700 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2703 dev_kfree_skb(rx->skb);
2707 static ieee80211_rx_result debug_noinline
2708 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2710 struct ieee80211_sub_if_data *sdata = rx->sdata;
2711 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2714 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2716 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2717 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2718 sdata->vif.type != NL80211_IFTYPE_STATION)
2719 return RX_DROP_MONITOR;
2722 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2723 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2724 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2725 /* process for all: mesh, mlme, ibss */
2727 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2728 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2729 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2730 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2731 if (is_multicast_ether_addr(mgmt->da) &&
2732 !is_broadcast_ether_addr(mgmt->da))
2733 return RX_DROP_MONITOR;
2735 /* process only for station */
2736 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2737 return RX_DROP_MONITOR;
2739 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2740 /* process only for ibss and mesh */
2741 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2742 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2743 return RX_DROP_MONITOR;
2746 return RX_DROP_MONITOR;
2749 /* queue up frame and kick off work to process it */
2750 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2751 skb_queue_tail(&sdata->skb_queue, rx->skb);
2752 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2754 rx->sta->rx_packets++;
2759 /* TODO: use IEEE80211_RX_FRAGMENTED */
2760 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2761 struct ieee80211_rate *rate)
2763 struct ieee80211_sub_if_data *sdata;
2764 struct ieee80211_local *local = rx->local;
2765 struct sk_buff *skb = rx->skb, *skb2;
2766 struct net_device *prev_dev = NULL;
2767 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2768 int needed_headroom;
2771 * If cooked monitor has been processed already, then
2772 * don't do it again. If not, set the flag.
2774 if (rx->flags & IEEE80211_RX_CMNTR)
2776 rx->flags |= IEEE80211_RX_CMNTR;
2778 /* If there are no cooked monitor interfaces, just free the SKB */
2779 if (!local->cooked_mntrs)
2782 /* room for the radiotap header based on driver features */
2783 needed_headroom = ieee80211_rx_radiotap_space(local, status);
2785 if (skb_headroom(skb) < needed_headroom &&
2786 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2789 /* prepend radiotap information */
2790 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2793 skb_set_mac_header(skb, 0);
2794 skb->ip_summed = CHECKSUM_UNNECESSARY;
2795 skb->pkt_type = PACKET_OTHERHOST;
2796 skb->protocol = htons(ETH_P_802_2);
2798 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2799 if (!ieee80211_sdata_running(sdata))
2802 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2803 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2807 skb2 = skb_clone(skb, GFP_ATOMIC);
2809 skb2->dev = prev_dev;
2810 netif_receive_skb(skb2);
2814 prev_dev = sdata->dev;
2815 sdata->dev->stats.rx_packets++;
2816 sdata->dev->stats.rx_bytes += skb->len;
2820 skb->dev = prev_dev;
2821 netif_receive_skb(skb);
2829 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2830 ieee80211_rx_result res)
2833 case RX_DROP_MONITOR:
2834 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2836 rx->sta->rx_dropped++;
2839 struct ieee80211_rate *rate = NULL;
2840 struct ieee80211_supported_band *sband;
2841 struct ieee80211_rx_status *status;
2843 status = IEEE80211_SKB_RXCB((rx->skb));
2845 sband = rx->local->hw.wiphy->bands[status->band];
2846 if (!(status->flag & RX_FLAG_HT) &&
2847 !(status->flag & RX_FLAG_VHT))
2848 rate = &sband->bitrates[status->rate_idx];
2850 ieee80211_rx_cooked_monitor(rx, rate);
2853 case RX_DROP_UNUSABLE:
2854 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2856 rx->sta->rx_dropped++;
2857 dev_kfree_skb(rx->skb);
2860 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2865 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2866 struct sk_buff_head *frames)
2868 ieee80211_rx_result res = RX_DROP_MONITOR;
2869 struct sk_buff *skb;
2871 #define CALL_RXH(rxh) \
2874 if (res != RX_CONTINUE) \
2878 spin_lock_bh(&rx->local->rx_path_lock);
2880 while ((skb = __skb_dequeue(frames))) {
2882 * all the other fields are valid across frames
2883 * that belong to an aMPDU since they are on the
2884 * same TID from the same station
2888 CALL_RXH(ieee80211_rx_h_decrypt)
2889 CALL_RXH(ieee80211_rx_h_check_more_data)
2890 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2891 CALL_RXH(ieee80211_rx_h_sta_process)
2892 CALL_RXH(ieee80211_rx_h_defragment)
2893 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2894 /* must be after MMIC verify so header is counted in MPDU mic */
2895 #ifdef CONFIG_MAC80211_MESH
2896 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2897 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2899 CALL_RXH(ieee80211_rx_h_amsdu)
2900 CALL_RXH(ieee80211_rx_h_data)
2902 /* special treatment -- needs the queue */
2903 res = ieee80211_rx_h_ctrl(rx, frames);
2904 if (res != RX_CONTINUE)
2907 CALL_RXH(ieee80211_rx_h_mgmt_check)
2908 CALL_RXH(ieee80211_rx_h_action)
2909 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2910 CALL_RXH(ieee80211_rx_h_action_return)
2911 CALL_RXH(ieee80211_rx_h_mgmt)
2914 ieee80211_rx_handlers_result(rx, res);
2919 spin_unlock_bh(&rx->local->rx_path_lock);
2922 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2924 struct sk_buff_head reorder_release;
2925 ieee80211_rx_result res = RX_DROP_MONITOR;
2927 __skb_queue_head_init(&reorder_release);
2929 #define CALL_RXH(rxh) \
2932 if (res != RX_CONTINUE) \
2936 CALL_RXH(ieee80211_rx_h_check)
2938 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2940 ieee80211_rx_handlers(rx, &reorder_release);
2944 ieee80211_rx_handlers_result(rx, res);
2950 * This function makes calls into the RX path, therefore
2951 * it has to be invoked under RCU read lock.
2953 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2955 struct sk_buff_head frames;
2956 struct ieee80211_rx_data rx = {
2958 .sdata = sta->sdata,
2959 .local = sta->local,
2960 /* This is OK -- must be QoS data frame */
2961 .security_idx = tid,
2965 struct tid_ampdu_rx *tid_agg_rx;
2967 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2971 __skb_queue_head_init(&frames);
2973 spin_lock(&tid_agg_rx->reorder_lock);
2974 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2975 spin_unlock(&tid_agg_rx->reorder_lock);
2977 ieee80211_rx_handlers(&rx, &frames);
2980 /* main receive path */
2982 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2983 struct ieee80211_hdr *hdr)
2985 struct ieee80211_sub_if_data *sdata = rx->sdata;
2986 struct sk_buff *skb = rx->skb;
2987 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2988 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2989 int multicast = is_multicast_ether_addr(hdr->addr1);
2991 switch (sdata->vif.type) {
2992 case NL80211_IFTYPE_STATION:
2993 if (!bssid && !sdata->u.mgd.use_4addr)
2996 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2997 if (!(sdata->dev->flags & IFF_PROMISC) ||
2998 sdata->u.mgd.use_4addr)
3000 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3003 case NL80211_IFTYPE_ADHOC:
3006 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3007 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3009 if (ieee80211_is_beacon(hdr->frame_control)) {
3011 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3013 } else if (!multicast &&
3014 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3015 if (!(sdata->dev->flags & IFF_PROMISC))
3017 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3018 } else if (!rx->sta) {
3020 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3021 rate_idx = 0; /* TODO: HT/VHT rates */
3023 rate_idx = status->rate_idx;
3024 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3028 case NL80211_IFTYPE_MESH_POINT:
3030 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3031 if (!(sdata->dev->flags & IFF_PROMISC))
3034 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3037 case NL80211_IFTYPE_AP_VLAN:
3038 case NL80211_IFTYPE_AP:
3040 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3042 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3044 * Accept public action frames even when the
3045 * BSSID doesn't match, this is used for P2P
3046 * and location updates. Note that mac80211
3047 * itself never looks at these frames.
3050 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3052 if (ieee80211_is_public_action(hdr, skb->len))
3054 if (!ieee80211_is_beacon(hdr->frame_control))
3056 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3059 case NL80211_IFTYPE_WDS:
3060 if (bssid || !ieee80211_is_data(hdr->frame_control))
3062 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3065 case NL80211_IFTYPE_P2P_DEVICE:
3066 if (!ieee80211_is_public_action(hdr, skb->len) &&
3067 !ieee80211_is_probe_req(hdr->frame_control) &&
3068 !ieee80211_is_probe_resp(hdr->frame_control) &&
3069 !ieee80211_is_beacon(hdr->frame_control))
3071 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3073 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3076 /* should never get here */
3085 * This function returns whether or not the SKB
3086 * was destined for RX processing or not, which,
3087 * if consume is true, is equivalent to whether
3088 * or not the skb was consumed.
3090 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3091 struct sk_buff *skb, bool consume)
3093 struct ieee80211_local *local = rx->local;
3094 struct ieee80211_sub_if_data *sdata = rx->sdata;
3095 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3096 struct ieee80211_hdr *hdr = (void *)skb->data;
3100 status->rx_flags |= IEEE80211_RX_RA_MATCH;
3101 prepares = prepare_for_handlers(rx, hdr);
3107 skb = skb_copy(skb, GFP_ATOMIC);
3109 if (net_ratelimit())
3110 wiphy_debug(local->hw.wiphy,
3111 "failed to copy skb for %s\n",
3119 ieee80211_invoke_rx_handlers(rx);
3124 * This is the actual Rx frames handler. as it blongs to Rx path it must
3125 * be called with rcu_read_lock protection.
3127 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3128 struct sk_buff *skb)
3130 struct ieee80211_local *local = hw_to_local(hw);
3131 struct ieee80211_sub_if_data *sdata;
3132 struct ieee80211_hdr *hdr;
3134 struct ieee80211_rx_data rx;
3135 struct ieee80211_sub_if_data *prev;
3136 struct sta_info *sta, *tmp, *prev_sta;
3139 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3140 memset(&rx, 0, sizeof(rx));
3144 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3145 local->dot11ReceivedFragmentCount++;
3147 if (ieee80211_is_mgmt(fc)) {
3148 /* drop frame if too short for header */
3149 if (skb->len < ieee80211_hdrlen(fc))
3152 err = skb_linearize(skb);
3154 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3162 hdr = (struct ieee80211_hdr *)skb->data;
3163 ieee80211_parse_qos(&rx);
3164 ieee80211_verify_alignment(&rx);
3166 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3167 ieee80211_is_beacon(hdr->frame_control)))
3168 ieee80211_scan_rx(local, skb);
3170 if (ieee80211_is_data(fc)) {
3173 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3180 rx.sdata = prev_sta->sdata;
3181 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3188 rx.sdata = prev_sta->sdata;
3190 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3198 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3199 if (!ieee80211_sdata_running(sdata))
3202 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3203 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3207 * frame is destined for this interface, but if it's
3208 * not also for the previous one we handle that after
3209 * the loop to avoid copying the SKB once too much
3217 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3219 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3225 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3228 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3237 * This is the receive path handler. It is called by a low level driver when an
3238 * 802.11 MPDU is received from the hardware.
3240 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3242 struct ieee80211_local *local = hw_to_local(hw);
3243 struct ieee80211_rate *rate = NULL;
3244 struct ieee80211_supported_band *sband;
3245 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3247 WARN_ON_ONCE(softirq_count() == 0);
3249 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3252 sband = local->hw.wiphy->bands[status->band];
3253 if (WARN_ON(!sband))
3257 * If we're suspending, it is possible although not too likely
3258 * that we'd be receiving frames after having already partially
3259 * quiesced the stack. We can't process such frames then since
3260 * that might, for example, cause stations to be added or other
3261 * driver callbacks be invoked.
3263 if (unlikely(local->quiescing || local->suspended))
3266 /* We might be during a HW reconfig, prevent Rx for the same reason */
3267 if (unlikely(local->in_reconfig))
3271 * The same happens when we're not even started,
3272 * but that's worth a warning.
3274 if (WARN_ON(!local->started))
3277 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3279 * Validate the rate, unless a PLCP error means that
3280 * we probably can't have a valid rate here anyway.
3283 if (status->flag & RX_FLAG_HT) {
3285 * rate_idx is MCS index, which can be [0-76]
3288 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3290 * Anything else would be some sort of driver or
3291 * hardware error. The driver should catch hardware
3294 if (WARN(status->rate_idx > 76,
3295 "Rate marked as an HT rate but passed "
3296 "status->rate_idx is not "
3297 "an MCS index [0-76]: %d (0x%02x)\n",
3301 } else if (status->flag & RX_FLAG_VHT) {
3302 if (WARN_ONCE(status->rate_idx > 9 ||
3304 status->vht_nss > 8,
3305 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3306 status->rate_idx, status->vht_nss))
3309 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3311 rate = &sband->bitrates[status->rate_idx];
3315 status->rx_flags = 0;
3318 * key references and virtual interfaces are protected using RCU
3319 * and this requires that we are in a read-side RCU section during
3320 * receive processing
3325 * Frames with failed FCS/PLCP checksum are not returned,
3326 * all other frames are returned without radiotap header
3327 * if it was previously present.
3328 * Also, frames with less than 16 bytes are dropped.
3330 skb = ieee80211_rx_monitor(local, skb, rate);
3336 ieee80211_tpt_led_trig_rx(local,
3337 ((struct ieee80211_hdr *)skb->data)->frame_control,
3339 __ieee80211_rx_handle_packet(hw, skb);
3347 EXPORT_SYMBOL(ieee80211_rx);
3349 /* This is a version of the rx handler that can be called from hard irq
3350 * context. Post the skb on the queue and schedule the tasklet */
3351 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3353 struct ieee80211_local *local = hw_to_local(hw);
3355 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3357 skb->pkt_type = IEEE80211_RX_MSG;
3358 skb_queue_tail(&local->skb_queue, skb);
3359 tasklet_schedule(&local->tasklet);
3361 EXPORT_SYMBOL(ieee80211_rx_irqsafe);