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 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/kernel.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rcupdate.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "driver-ops.h"
31 * monitor mode reception
33 * This function cleans up the SKB, i.e. it removes all the stuff
34 * only useful for monitoring.
36 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
39 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
40 if (likely(skb->len > FCS_LEN))
41 skb_trim(skb, skb->len - FCS_LEN);
53 static inline int should_drop_frame(struct sk_buff *skb,
56 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
57 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
59 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 if (unlikely(skb->len < 16 + present_fcs_len))
63 if (ieee80211_is_ctl(hdr->frame_control) &&
64 !ieee80211_is_pspoll(hdr->frame_control) &&
65 !ieee80211_is_back_req(hdr->frame_control))
71 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
72 struct ieee80211_rx_status *status)
76 /* always present fields */
77 len = sizeof(struct ieee80211_radiotap_header) + 9;
79 if (status->flag & RX_FLAG_TSFT)
81 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
83 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
86 if (len & 1) /* padding for RX_FLAGS if necessary */
93 * ieee80211_add_rx_radiotap_header - add radiotap header
95 * add a radiotap header containing all the fields which the hardware provided.
98 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
100 struct ieee80211_rate *rate,
103 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
104 struct ieee80211_radiotap_header *rthdr;
108 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
109 memset(rthdr, 0, rtap_len);
111 /* radiotap header, set always present flags */
113 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
114 (1 << IEEE80211_RADIOTAP_CHANNEL) |
115 (1 << IEEE80211_RADIOTAP_ANTENNA) |
116 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
117 rthdr->it_len = cpu_to_le16(rtap_len);
119 pos = (unsigned char *)(rthdr+1);
121 /* the order of the following fields is important */
123 /* IEEE80211_RADIOTAP_TSFT */
124 if (status->flag & RX_FLAG_TSFT) {
125 put_unaligned_le64(status->mactime, pos);
127 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
131 /* IEEE80211_RADIOTAP_FLAGS */
132 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
133 *pos |= IEEE80211_RADIOTAP_F_FCS;
134 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
135 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
136 if (status->flag & RX_FLAG_SHORTPRE)
137 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
140 /* IEEE80211_RADIOTAP_RATE */
141 if (status->flag & RX_FLAG_HT) {
143 * TODO: add following information into radiotap header once
144 * suitable fields are defined for it:
145 * - MCS index (status->rate_idx)
146 * - HT40 (status->flag & RX_FLAG_40MHZ)
147 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
151 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
152 *pos = rate->bitrate / 5;
156 /* IEEE80211_RADIOTAP_CHANNEL */
157 put_unaligned_le16(status->freq, pos);
159 if (status->band == IEEE80211_BAND_5GHZ)
160 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
162 else if (status->flag & RX_FLAG_HT)
163 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
165 else if (rate->flags & IEEE80211_RATE_ERP_G)
166 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
169 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
175 *pos = status->signal;
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
181 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
182 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
183 *pos = status->noise;
185 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
189 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
191 /* IEEE80211_RADIOTAP_ANTENNA */
192 *pos = status->antenna;
195 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
197 /* IEEE80211_RADIOTAP_RX_FLAGS */
198 /* ensure 2 byte alignment for the 2 byte field as required */
199 if ((pos - (u8 *)rthdr) & 1)
201 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
202 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
203 put_unaligned_le16(rx_flags, pos);
208 * This function copies a received frame to all monitor interfaces and
209 * returns a cleaned-up SKB that no longer includes the FCS nor the
210 * radiotap header the driver might have added.
212 static struct sk_buff *
213 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
214 struct ieee80211_rate *rate)
216 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
217 struct ieee80211_sub_if_data *sdata;
218 int needed_headroom = 0;
219 struct sk_buff *skb, *skb2;
220 struct net_device *prev_dev = NULL;
221 int present_fcs_len = 0;
224 * First, we may need to make a copy of the skb because
225 * (1) we need to modify it for radiotap (if not present), and
226 * (2) the other RX handlers will modify the skb we got.
228 * We don't need to, of course, if we aren't going to return
229 * the SKB because it has a bad FCS/PLCP checksum.
232 /* room for the radiotap header based on driver features */
233 needed_headroom = ieee80211_rx_radiotap_len(local, status);
235 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
236 present_fcs_len = FCS_LEN;
238 if (!local->monitors) {
239 if (should_drop_frame(origskb, present_fcs_len)) {
240 dev_kfree_skb(origskb);
244 return remove_monitor_info(local, origskb);
247 if (should_drop_frame(origskb, present_fcs_len)) {
248 /* only need to expand headroom if necessary */
253 * This shouldn't trigger often because most devices have an
254 * RX header they pull before we get here, and that should
255 * be big enough for our radiotap information. We should
256 * probably export the length to drivers so that we can have
257 * them allocate enough headroom to start with.
259 if (skb_headroom(skb) < needed_headroom &&
260 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
266 * Need to make a copy and possibly remove radiotap header
267 * and FCS from the original.
269 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
271 origskb = remove_monitor_info(local, origskb);
277 /* prepend radiotap information */
278 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
280 skb_reset_mac_header(skb);
281 skb->ip_summed = CHECKSUM_UNNECESSARY;
282 skb->pkt_type = PACKET_OTHERHOST;
283 skb->protocol = htons(ETH_P_802_2);
285 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
286 if (!netif_running(sdata->dev))
289 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
292 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
296 skb2 = skb_clone(skb, GFP_ATOMIC);
298 skb2->dev = prev_dev;
303 prev_dev = sdata->dev;
304 sdata->dev->stats.rx_packets++;
305 sdata->dev->stats.rx_bytes += skb->len;
318 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
320 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
323 /* does the frame have a qos control field? */
324 if (ieee80211_is_data_qos(hdr->frame_control)) {
325 u8 *qc = ieee80211_get_qos_ctl(hdr);
326 /* frame has qos control */
327 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
328 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
329 rx->flags |= IEEE80211_RX_AMSDU;
331 rx->flags &= ~IEEE80211_RX_AMSDU;
334 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
336 * Sequence numbers for management frames, QoS data
337 * frames with a broadcast/multicast address in the
338 * Address 1 field, and all non-QoS data frames sent
339 * by QoS STAs are assigned using an additional single
340 * modulo-4096 counter, [...]
342 * We also use that counter for non-QoS STAs.
344 tid = NUM_RX_DATA_QUEUES - 1;
348 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
349 * For now, set skb->priority to 0 for other cases. */
350 rx->skb->priority = (tid > 7) ? 0 : tid;
354 * DOC: Packet alignment
356 * Drivers always need to pass packets that are aligned to two-byte boundaries
359 * Additionally, should, if possible, align the payload data in a way that
360 * guarantees that the contained IP header is aligned to a four-byte
361 * boundary. In the case of regular frames, this simply means aligning the
362 * payload to a four-byte boundary (because either the IP header is directly
363 * contained, or IV/RFC1042 headers that have a length divisible by four are
366 * With A-MSDU frames, however, the payload data address must yield two modulo
367 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
368 * push the IP header further back to a multiple of four again. Thankfully, the
369 * specs were sane enough this time around to require padding each A-MSDU
370 * subframe to a length that is a multiple of four.
372 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
373 * the payload is not supported, the driver is required to move the 802.11
374 * header to be directly in front of the payload in that case.
376 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
378 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
381 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
385 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
386 "unaligned packet at 0x%p\n", rx->skb->data))
389 if (!ieee80211_is_data_present(hdr->frame_control))
392 hdrlen = ieee80211_hdrlen(hdr->frame_control);
393 if (rx->flags & IEEE80211_RX_AMSDU)
395 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
396 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
402 static ieee80211_rx_result debug_noinline
403 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
405 struct ieee80211_local *local = rx->local;
406 struct sk_buff *skb = rx->skb;
408 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
409 return ieee80211_scan_rx(rx->sdata, skb);
411 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
412 (rx->flags & IEEE80211_RX_IN_SCAN))) {
413 /* drop all the other packets during a software scan anyway */
414 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
419 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
420 /* scanning finished during invoking of handlers */
421 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
422 return RX_DROP_UNUSABLE;
429 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
431 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
433 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
436 return ieee80211_is_robust_mgmt_frame(hdr);
440 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
442 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
447 return ieee80211_is_robust_mgmt_frame(hdr);
451 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
452 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
454 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
455 struct ieee80211_mmie *mmie;
457 if (skb->len < 24 + sizeof(*mmie) ||
458 !is_multicast_ether_addr(hdr->da))
461 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
462 return -1; /* not a robust management frame */
464 mmie = (struct ieee80211_mmie *)
465 (skb->data + skb->len - sizeof(*mmie));
466 if (mmie->element_id != WLAN_EID_MMIE ||
467 mmie->length != sizeof(*mmie) - 2)
470 return le16_to_cpu(mmie->key_id);
474 static ieee80211_rx_result
475 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
477 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
478 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
479 char *dev_addr = rx->sdata->dev->dev_addr;
481 if (ieee80211_is_data(hdr->frame_control)) {
482 if (is_multicast_ether_addr(hdr->addr1)) {
483 if (ieee80211_has_tods(hdr->frame_control) ||
484 !ieee80211_has_fromds(hdr->frame_control))
485 return RX_DROP_MONITOR;
486 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
487 return RX_DROP_MONITOR;
489 if (!ieee80211_has_a4(hdr->frame_control))
490 return RX_DROP_MONITOR;
491 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
492 return RX_DROP_MONITOR;
496 /* If there is not an established peer link and this is not a peer link
497 * establisment frame, beacon or probe, drop the frame.
500 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
501 struct ieee80211_mgmt *mgmt;
503 if (!ieee80211_is_mgmt(hdr->frame_control))
504 return RX_DROP_MONITOR;
506 if (ieee80211_is_action(hdr->frame_control)) {
507 mgmt = (struct ieee80211_mgmt *)hdr;
508 if (mgmt->u.action.category != MESH_PLINK_CATEGORY)
509 return RX_DROP_MONITOR;
513 if (ieee80211_is_probe_req(hdr->frame_control) ||
514 ieee80211_is_probe_resp(hdr->frame_control) ||
515 ieee80211_is_beacon(hdr->frame_control))
518 return RX_DROP_MONITOR;
522 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
524 if (ieee80211_is_data(hdr->frame_control) &&
525 is_multicast_ether_addr(hdr->addr1) &&
526 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
527 return RX_DROP_MONITOR;
533 #define SEQ_MODULO 0x1000
534 #define SEQ_MASK 0xfff
536 static inline int seq_less(u16 sq1, u16 sq2)
538 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
541 static inline u16 seq_inc(u16 sq)
543 return (sq + 1) & SEQ_MASK;
546 static inline u16 seq_sub(u16 sq1, u16 sq2)
548 return (sq1 - sq2) & SEQ_MASK;
552 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
553 struct tid_ampdu_rx *tid_agg_rx,
555 struct sk_buff_head *frames)
557 struct ieee80211_supported_band *sband;
558 struct ieee80211_rate *rate = NULL;
559 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
560 struct ieee80211_rx_status *status;
565 status = IEEE80211_SKB_RXCB(skb);
567 /* release the reordered frames to stack */
568 sband = hw->wiphy->bands[status->band];
569 if (!(status->flag & RX_FLAG_HT))
570 rate = &sband->bitrates[status->rate_idx];
571 tid_agg_rx->stored_mpdu_num--;
572 tid_agg_rx->reorder_buf[index] = NULL;
573 __skb_queue_tail(frames, skb);
576 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
579 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
580 struct tid_ampdu_rx *tid_agg_rx,
582 struct sk_buff_head *frames)
586 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
587 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
588 tid_agg_rx->buf_size;
589 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
594 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
595 * the skb was added to the buffer longer than this time ago, the earlier
596 * frames that have not yet been received are assumed to be lost and the skb
597 * can be released for processing. This may also release other skb's from the
598 * reorder buffer if there are no additional gaps between the frames.
600 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
603 * As this function belongs to the RX path it must be under
604 * rcu_read_lock protection. It returns false if the frame
605 * can be processed immediately, true if it was consumed.
607 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
608 struct tid_ampdu_rx *tid_agg_rx,
610 struct sk_buff_head *frames)
612 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
613 u16 sc = le16_to_cpu(hdr->seq_ctrl);
614 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
615 u16 head_seq_num, buf_size;
618 buf_size = tid_agg_rx->buf_size;
619 head_seq_num = tid_agg_rx->head_seq_num;
621 /* frame with out of date sequence number */
622 if (seq_less(mpdu_seq_num, head_seq_num)) {
628 * If frame the sequence number exceeds our buffering window
629 * size release some previous frames to make room for this one.
631 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
632 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
633 /* release stored frames up to new head to stack */
634 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
638 /* Now the new frame is always in the range of the reordering buffer */
640 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
642 /* check if we already stored this frame */
643 if (tid_agg_rx->reorder_buf[index]) {
649 * If the current MPDU is in the right order and nothing else
650 * is stored we can process it directly, no need to buffer it.
652 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
653 tid_agg_rx->stored_mpdu_num == 0) {
654 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
658 /* put the frame in the reordering buffer */
659 tid_agg_rx->reorder_buf[index] = skb;
660 tid_agg_rx->reorder_time[index] = jiffies;
661 tid_agg_rx->stored_mpdu_num++;
662 /* release the buffer until next missing frame */
663 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
664 tid_agg_rx->buf_size;
665 if (!tid_agg_rx->reorder_buf[index] &&
666 tid_agg_rx->stored_mpdu_num > 1) {
668 * No buffers ready to be released, but check whether any
669 * frames in the reorder buffer have timed out.
673 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
674 j = (j + 1) % tid_agg_rx->buf_size) {
675 if (!tid_agg_rx->reorder_buf[j]) {
679 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
680 HT_RX_REORDER_BUF_TIMEOUT))
683 #ifdef CONFIG_MAC80211_HT_DEBUG
685 printk(KERN_DEBUG "%s: release an RX reorder "
686 "frame due to timeout on earlier "
688 wiphy_name(hw->wiphy));
690 ieee80211_release_reorder_frame(hw, tid_agg_rx,
694 * Increment the head seq# also for the skipped slots.
696 tid_agg_rx->head_seq_num =
697 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
700 } else while (tid_agg_rx->reorder_buf[index]) {
701 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
702 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
703 tid_agg_rx->buf_size;
710 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
711 * true if the MPDU was buffered, false if it should be processed.
713 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
714 struct sk_buff_head *frames)
716 struct sk_buff *skb = rx->skb;
717 struct ieee80211_local *local = rx->local;
718 struct ieee80211_hw *hw = &local->hw;
719 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
720 struct sta_info *sta = rx->sta;
721 struct tid_ampdu_rx *tid_agg_rx;
725 if (!ieee80211_is_data_qos(hdr->frame_control))
729 * filter the QoS data rx stream according to
730 * STA/TID and check if this STA/TID is on aggregation
736 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
738 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
741 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
743 /* qos null data frames are excluded */
744 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
747 /* new, potentially un-ordered, ampdu frame - process it */
749 /* reset session timer */
750 if (tid_agg_rx->timeout)
751 mod_timer(&tid_agg_rx->session_timer,
752 TU_TO_EXP_TIME(tid_agg_rx->timeout));
754 /* if this mpdu is fragmented - terminate rx aggregation session */
755 sc = le16_to_cpu(hdr->seq_ctrl);
756 if (sc & IEEE80211_SCTL_FRAG) {
757 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
758 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
763 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
767 __skb_queue_tail(frames, skb);
770 static ieee80211_rx_result debug_noinline
771 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
773 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
775 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
776 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
777 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
778 rx->sta->last_seq_ctrl[rx->queue] ==
780 if (rx->flags & IEEE80211_RX_RA_MATCH) {
781 rx->local->dot11FrameDuplicateCount++;
782 rx->sta->num_duplicates++;
784 return RX_DROP_MONITOR;
786 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
789 if (unlikely(rx->skb->len < 16)) {
790 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
791 return RX_DROP_MONITOR;
794 /* Drop disallowed frame classes based on STA auth/assoc state;
795 * IEEE 802.11, Chap 5.5.
797 * mac80211 filters only based on association state, i.e. it drops
798 * Class 3 frames from not associated stations. hostapd sends
799 * deauth/disassoc frames when needed. In addition, hostapd is
800 * responsible for filtering on both auth and assoc states.
803 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
804 return ieee80211_rx_mesh_check(rx);
806 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
807 ieee80211_is_pspoll(hdr->frame_control)) &&
808 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
809 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
810 if ((!ieee80211_has_fromds(hdr->frame_control) &&
811 !ieee80211_has_tods(hdr->frame_control) &&
812 ieee80211_is_data(hdr->frame_control)) ||
813 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
814 /* Drop IBSS frames and frames for other hosts
816 return RX_DROP_MONITOR;
819 return RX_DROP_MONITOR;
826 static ieee80211_rx_result debug_noinline
827 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
829 struct sk_buff *skb = rx->skb;
830 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
831 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
834 ieee80211_rx_result result = RX_DROP_UNUSABLE;
835 struct ieee80211_key *stakey = NULL;
836 int mmie_keyidx = -1;
841 * There are four types of keys:
843 * - IGTK (group keys for management frames)
844 * - PTK (pairwise keys)
845 * - STK (station-to-station pairwise keys)
847 * When selecting a key, we have to distinguish between multicast
848 * (including broadcast) and unicast frames, the latter can only
849 * use PTKs and STKs while the former always use GTKs and IGTKs.
850 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
851 * unicast frames can also use key indices like GTKs. Hence, if we
852 * don't have a PTK/STK we check the key index for a WEP key.
854 * Note that in a regular BSS, multicast frames are sent by the
855 * AP only, associated stations unicast the frame to the AP first
856 * which then multicasts it on their behalf.
858 * There is also a slight problem in IBSS mode: GTKs are negotiated
859 * with each station, that is something we don't currently handle.
860 * The spec seems to expect that one negotiates the same key with
861 * every station but there's no such requirement; VLANs could be
866 * No point in finding a key and decrypting if the frame is neither
867 * addressed to us nor a multicast frame.
869 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
872 /* start without a key */
876 stakey = rcu_dereference(rx->sta->key);
878 if (!ieee80211_has_protected(hdr->frame_control))
879 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
881 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
883 /* Skip decryption if the frame is not protected. */
884 if (!ieee80211_has_protected(hdr->frame_control))
886 } else if (mmie_keyidx >= 0) {
887 /* Broadcast/multicast robust management frame / BIP */
888 if ((status->flag & RX_FLAG_DECRYPTED) &&
889 (status->flag & RX_FLAG_IV_STRIPPED))
892 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
893 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
894 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
895 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
896 } else if (!ieee80211_has_protected(hdr->frame_control)) {
898 * The frame was not protected, so skip decryption. However, we
899 * need to set rx->key if there is a key that could have been
900 * used so that the frame may be dropped if encryption would
901 * have been expected.
903 struct ieee80211_key *key = NULL;
904 if (ieee80211_is_mgmt(hdr->frame_control) &&
905 is_multicast_ether_addr(hdr->addr1) &&
906 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
908 else if ((key = rcu_dereference(rx->sdata->default_key)))
913 * The device doesn't give us the IV so we won't be
914 * able to look up the key. That's ok though, we
915 * don't need to decrypt the frame, we just won't
916 * be able to keep statistics accurate.
917 * Except for key threshold notifications, should
918 * we somehow allow the driver to tell us which key
919 * the hardware used if this flag is set?
921 if ((status->flag & RX_FLAG_DECRYPTED) &&
922 (status->flag & RX_FLAG_IV_STRIPPED))
925 hdrlen = ieee80211_hdrlen(hdr->frame_control);
927 if (rx->skb->len < 8 + hdrlen)
928 return RX_DROP_UNUSABLE; /* TODO: count this? */
931 * no need to call ieee80211_wep_get_keyidx,
932 * it verifies a bunch of things we've done already
934 keyidx = rx->skb->data[hdrlen + 3] >> 6;
936 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
939 * RSNA-protected unicast frames should always be sent with
940 * pairwise or station-to-station keys, but for WEP we allow
941 * using a key index as well.
943 if (rx->key && rx->key->conf.alg != ALG_WEP &&
944 !is_multicast_ether_addr(hdr->addr1))
949 rx->key->tx_rx_count++;
950 /* TODO: add threshold stuff again */
952 return RX_DROP_MONITOR;
955 /* Check for weak IVs if possible */
956 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
957 ieee80211_is_data(hdr->frame_control) &&
958 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
959 !(status->flag & RX_FLAG_DECRYPTED)) &&
960 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
961 rx->sta->wep_weak_iv_count++;
963 switch (rx->key->conf.alg) {
965 result = ieee80211_crypto_wep_decrypt(rx);
968 result = ieee80211_crypto_tkip_decrypt(rx);
971 result = ieee80211_crypto_ccmp_decrypt(rx);
974 result = ieee80211_crypto_aes_cmac_decrypt(rx);
978 /* either the frame has been decrypted or will be dropped */
979 status->flag |= RX_FLAG_DECRYPTED;
984 static ieee80211_rx_result debug_noinline
985 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
987 struct ieee80211_local *local;
988 struct ieee80211_hdr *hdr;
993 hdr = (struct ieee80211_hdr *) skb->data;
995 if (!local->pspolling)
998 if (!ieee80211_has_fromds(hdr->frame_control))
999 /* this is not from AP */
1002 if (!ieee80211_is_data(hdr->frame_control))
1005 if (!ieee80211_has_moredata(hdr->frame_control)) {
1006 /* AP has no more frames buffered for us */
1007 local->pspolling = false;
1011 /* more data bit is set, let's request a new frame from the AP */
1012 ieee80211_send_pspoll(local, rx->sdata);
1017 static void ap_sta_ps_start(struct sta_info *sta)
1019 struct ieee80211_sub_if_data *sdata = sta->sdata;
1020 struct ieee80211_local *local = sdata->local;
1022 atomic_inc(&sdata->bss->num_sta_ps);
1023 set_sta_flags(sta, WLAN_STA_PS_STA);
1024 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
1025 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1026 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1027 sdata->dev->name, sta->sta.addr, sta->sta.aid);
1028 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1031 static void ap_sta_ps_end(struct sta_info *sta)
1033 struct ieee80211_sub_if_data *sdata = sta->sdata;
1035 atomic_dec(&sdata->bss->num_sta_ps);
1037 clear_sta_flags(sta, WLAN_STA_PS_STA);
1039 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1040 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1041 sdata->dev->name, sta->sta.addr, sta->sta.aid);
1042 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1044 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
1045 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1046 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1047 sdata->dev->name, sta->sta.addr, sta->sta.aid);
1048 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1052 ieee80211_sta_ps_deliver_wakeup(sta);
1055 static ieee80211_rx_result debug_noinline
1056 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1058 struct sta_info *sta = rx->sta;
1059 struct sk_buff *skb = rx->skb;
1060 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1061 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1067 * Update last_rx only for IBSS packets which are for the current
1068 * BSSID to avoid keeping the current IBSS network alive in cases
1069 * where other STAs start using different BSSID.
1071 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1072 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1073 NL80211_IFTYPE_ADHOC);
1074 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
1075 sta->last_rx = jiffies;
1076 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1078 * Mesh beacons will update last_rx when if they are found to
1079 * match the current local configuration when processed.
1081 sta->last_rx = jiffies;
1084 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1087 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1088 ieee80211_sta_rx_notify(rx->sdata, hdr);
1090 sta->rx_fragments++;
1091 sta->rx_bytes += rx->skb->len;
1092 sta->last_signal = status->signal;
1093 sta->last_noise = status->noise;
1096 * Change STA power saving mode only at the end of a frame
1097 * exchange sequence.
1099 if (!ieee80211_has_morefrags(hdr->frame_control) &&
1100 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1101 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1102 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
1104 * Ignore doze->wake transitions that are
1105 * indicated by non-data frames, the standard
1106 * is unclear here, but for example going to
1107 * PS mode and then scanning would cause a
1108 * doze->wake transition for the probe request,
1109 * and that is clearly undesirable.
1111 if (ieee80211_is_data(hdr->frame_control) &&
1112 !ieee80211_has_pm(hdr->frame_control))
1115 if (ieee80211_has_pm(hdr->frame_control))
1116 ap_sta_ps_start(sta);
1121 * Drop (qos-)data::nullfunc frames silently, since they
1122 * are used only to control station power saving mode.
1124 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1125 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1126 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1128 * Update counter and free packet here to avoid
1129 * counting this as a dropped packed.
1132 dev_kfree_skb(rx->skb);
1137 } /* ieee80211_rx_h_sta_process */
1139 static inline struct ieee80211_fragment_entry *
1140 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1141 unsigned int frag, unsigned int seq, int rx_queue,
1142 struct sk_buff **skb)
1144 struct ieee80211_fragment_entry *entry;
1147 idx = sdata->fragment_next;
1148 entry = &sdata->fragments[sdata->fragment_next++];
1149 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1150 sdata->fragment_next = 0;
1152 if (!skb_queue_empty(&entry->skb_list)) {
1153 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1154 struct ieee80211_hdr *hdr =
1155 (struct ieee80211_hdr *) entry->skb_list.next->data;
1156 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1157 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1158 "addr1=%pM addr2=%pM\n",
1159 sdata->dev->name, idx,
1160 jiffies - entry->first_frag_time, entry->seq,
1161 entry->last_frag, hdr->addr1, hdr->addr2);
1163 __skb_queue_purge(&entry->skb_list);
1166 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1168 entry->first_frag_time = jiffies;
1170 entry->rx_queue = rx_queue;
1171 entry->last_frag = frag;
1173 entry->extra_len = 0;
1178 static inline struct ieee80211_fragment_entry *
1179 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1180 unsigned int frag, unsigned int seq,
1181 int rx_queue, struct ieee80211_hdr *hdr)
1183 struct ieee80211_fragment_entry *entry;
1186 idx = sdata->fragment_next;
1187 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1188 struct ieee80211_hdr *f_hdr;
1192 idx = IEEE80211_FRAGMENT_MAX - 1;
1194 entry = &sdata->fragments[idx];
1195 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1196 entry->rx_queue != rx_queue ||
1197 entry->last_frag + 1 != frag)
1200 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1203 * Check ftype and addresses are equal, else check next fragment
1205 if (((hdr->frame_control ^ f_hdr->frame_control) &
1206 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1207 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1208 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1211 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1212 __skb_queue_purge(&entry->skb_list);
1221 static ieee80211_rx_result debug_noinline
1222 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1224 struct ieee80211_hdr *hdr;
1227 unsigned int frag, seq;
1228 struct ieee80211_fragment_entry *entry;
1229 struct sk_buff *skb;
1231 hdr = (struct ieee80211_hdr *)rx->skb->data;
1232 fc = hdr->frame_control;
1233 sc = le16_to_cpu(hdr->seq_ctrl);
1234 frag = sc & IEEE80211_SCTL_FRAG;
1236 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1237 (rx->skb)->len < 24 ||
1238 is_multicast_ether_addr(hdr->addr1))) {
1239 /* not fragmented */
1242 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1244 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1247 /* This is the first fragment of a new frame. */
1248 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1249 rx->queue, &(rx->skb));
1250 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1251 ieee80211_has_protected(fc)) {
1252 /* Store CCMP PN so that we can verify that the next
1253 * fragment has a sequential PN value. */
1255 memcpy(entry->last_pn,
1256 rx->key->u.ccmp.rx_pn[rx->queue],
1262 /* This is a fragment for a frame that should already be pending in
1263 * fragment cache. Add this fragment to the end of the pending entry.
1265 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1267 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1268 return RX_DROP_MONITOR;
1271 /* Verify that MPDUs within one MSDU have sequential PN values.
1272 * (IEEE 802.11i, 8.3.3.4.5) */
1275 u8 pn[CCMP_PN_LEN], *rpn;
1276 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1277 return RX_DROP_UNUSABLE;
1278 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1279 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1284 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1285 if (memcmp(pn, rpn, CCMP_PN_LEN))
1286 return RX_DROP_UNUSABLE;
1287 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1290 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1291 __skb_queue_tail(&entry->skb_list, rx->skb);
1292 entry->last_frag = frag;
1293 entry->extra_len += rx->skb->len;
1294 if (ieee80211_has_morefrags(fc)) {
1299 rx->skb = __skb_dequeue(&entry->skb_list);
1300 if (skb_tailroom(rx->skb) < entry->extra_len) {
1301 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1302 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1304 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1305 __skb_queue_purge(&entry->skb_list);
1306 return RX_DROP_UNUSABLE;
1309 while ((skb = __skb_dequeue(&entry->skb_list))) {
1310 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1314 /* Complete frame has been reassembled - process it now */
1315 rx->flags |= IEEE80211_RX_FRAGMENTED;
1319 rx->sta->rx_packets++;
1320 if (is_multicast_ether_addr(hdr->addr1))
1321 rx->local->dot11MulticastReceivedFrameCount++;
1323 ieee80211_led_rx(rx->local);
1327 static ieee80211_rx_result debug_noinline
1328 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1330 struct ieee80211_sub_if_data *sdata = rx->sdata;
1331 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1333 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1334 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1337 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1338 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1339 return RX_DROP_UNUSABLE;
1341 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1342 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1344 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1346 /* Free PS Poll skb here instead of returning RX_DROP that would
1347 * count as an dropped frame. */
1348 dev_kfree_skb(rx->skb);
1353 static ieee80211_rx_result debug_noinline
1354 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1356 u8 *data = rx->skb->data;
1357 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1359 if (!ieee80211_is_data_qos(hdr->frame_control))
1362 /* remove the qos control field, update frame type and meta-data */
1363 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1364 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1365 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1366 /* change frame type to non QOS */
1367 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1373 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1375 if (unlikely(!rx->sta ||
1376 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1383 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1385 struct sk_buff *skb = rx->skb;
1386 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1389 * Pass through unencrypted frames if the hardware has
1390 * decrypted them already.
1392 if (status->flag & RX_FLAG_DECRYPTED)
1395 /* Drop unencrypted frames if key is set. */
1396 if (unlikely(!ieee80211_has_protected(fc) &&
1397 !ieee80211_is_nullfunc(fc) &&
1398 ieee80211_is_data(fc) &&
1399 (rx->key || rx->sdata->drop_unencrypted)))
1401 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1402 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1405 /* BIP does not use Protected field, so need to check MMIE */
1406 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1407 ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1411 * When using MFP, Action frames are not allowed prior to
1412 * having configured keys.
1414 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1415 ieee80211_is_robust_mgmt_frame(
1416 (struct ieee80211_hdr *) rx->skb->data)))
1424 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1426 struct ieee80211_sub_if_data *sdata = rx->sdata;
1427 struct net_device *dev = sdata->dev;
1428 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1430 if (ieee80211_has_a4(hdr->frame_control) &&
1431 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1434 if (is_multicast_ether_addr(hdr->addr1) &&
1435 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1436 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
1439 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
1443 * requires that rx->skb is a frame with ethernet header
1445 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1447 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1448 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1449 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1452 * Allow EAPOL frames to us/the PAE group address regardless
1453 * of whether the frame was encrypted or not.
1455 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1456 (compare_ether_addr(ehdr->h_dest, rx->sdata->dev->dev_addr) == 0 ||
1457 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1460 if (ieee80211_802_1x_port_control(rx) ||
1461 ieee80211_drop_unencrypted(rx, fc))
1468 * requires that rx->skb is a frame with ethernet header
1471 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1473 struct ieee80211_sub_if_data *sdata = rx->sdata;
1474 struct net_device *dev = sdata->dev;
1475 struct ieee80211_local *local = rx->local;
1476 struct sk_buff *skb, *xmit_skb;
1477 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1478 struct sta_info *dsta;
1483 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1484 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1485 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1486 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1487 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1488 if (is_multicast_ether_addr(ehdr->h_dest)) {
1490 * send multicast frames both to higher layers in
1491 * local net stack and back to the wireless medium
1493 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1494 if (!xmit_skb && net_ratelimit())
1495 printk(KERN_DEBUG "%s: failed to clone "
1496 "multicast frame\n", dev->name);
1498 dsta = sta_info_get(local, skb->data);
1499 if (dsta && dsta->sdata->dev == dev) {
1501 * The destination station is associated to
1502 * this AP (in this VLAN), so send the frame
1503 * directly to it and do not pass it to local
1513 int align __maybe_unused;
1515 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1517 * 'align' will only take the values 0 or 2 here
1518 * since all frames are required to be aligned
1519 * to 2-byte boundaries when being passed to
1520 * mac80211. That also explains the __skb_push()
1523 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1525 if (WARN_ON(skb_headroom(skb) < 3)) {
1529 u8 *data = skb->data;
1530 size_t len = skb_headlen(skb);
1532 memmove(skb->data, data, len);
1533 skb_set_tail_pointer(skb, len);
1539 /* deliver to local stack */
1540 skb->protocol = eth_type_trans(skb, dev);
1541 memset(skb->cb, 0, sizeof(skb->cb));
1547 /* send to wireless media */
1548 xmit_skb->protocol = htons(ETH_P_802_3);
1549 skb_reset_network_header(xmit_skb);
1550 skb_reset_mac_header(xmit_skb);
1551 dev_queue_xmit(xmit_skb);
1555 static ieee80211_rx_result debug_noinline
1556 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1558 struct net_device *dev = rx->sdata->dev;
1559 struct ieee80211_local *local = rx->local;
1562 struct sk_buff *skb = rx->skb, *frame = NULL;
1563 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1564 __le16 fc = hdr->frame_control;
1565 const struct ethhdr *eth;
1570 if (unlikely(!ieee80211_is_data(fc)))
1573 if (unlikely(!ieee80211_is_data_present(fc)))
1574 return RX_DROP_MONITOR;
1576 if (!(rx->flags & IEEE80211_RX_AMSDU))
1579 err = __ieee80211_data_to_8023(rx);
1581 return RX_DROP_UNUSABLE;
1585 dev->stats.rx_packets++;
1586 dev->stats.rx_bytes += skb->len;
1588 /* skip the wrapping header */
1589 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1591 return RX_DROP_UNUSABLE;
1593 while (skb != frame) {
1595 __be16 len = eth->h_proto;
1596 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1598 remaining = skb->len;
1599 memcpy(dst, eth->h_dest, ETH_ALEN);
1600 memcpy(src, eth->h_source, ETH_ALEN);
1602 padding = ((4 - subframe_len) & 0x3);
1603 /* the last MSDU has no padding */
1604 if (subframe_len > remaining)
1605 return RX_DROP_UNUSABLE;
1607 skb_pull(skb, sizeof(struct ethhdr));
1608 /* if last subframe reuse skb */
1609 if (remaining <= subframe_len + padding)
1613 * Allocate and reserve two bytes more for payload
1614 * alignment since sizeof(struct ethhdr) is 14.
1616 frame = dev_alloc_skb(
1617 ALIGN(local->hw.extra_tx_headroom, 4) +
1621 return RX_DROP_UNUSABLE;
1624 ALIGN(local->hw.extra_tx_headroom, 4) +
1625 sizeof(struct ethhdr) + 2);
1626 memcpy(skb_put(frame, ntohs(len)), skb->data,
1629 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1632 dev_kfree_skb(frame);
1633 return RX_DROP_UNUSABLE;
1637 skb_reset_network_header(frame);
1639 frame->priority = skb->priority;
1642 payload = frame->data;
1643 ethertype = (payload[6] << 8) | payload[7];
1645 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1646 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1647 compare_ether_addr(payload,
1648 bridge_tunnel_header) == 0)) {
1649 /* remove RFC1042 or Bridge-Tunnel
1650 * encapsulation and replace EtherType */
1652 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1653 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1655 memcpy(skb_push(frame, sizeof(__be16)),
1656 &len, sizeof(__be16));
1657 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1658 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1661 if (!ieee80211_frame_allowed(rx, fc)) {
1662 if (skb == frame) /* last frame */
1663 return RX_DROP_UNUSABLE;
1664 dev_kfree_skb(frame);
1668 ieee80211_deliver_skb(rx);
1674 #ifdef CONFIG_MAC80211_MESH
1675 static ieee80211_rx_result
1676 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1678 struct ieee80211_hdr *hdr;
1679 struct ieee80211s_hdr *mesh_hdr;
1680 unsigned int hdrlen;
1681 struct sk_buff *skb = rx->skb, *fwd_skb;
1682 struct ieee80211_local *local = rx->local;
1683 struct ieee80211_sub_if_data *sdata = rx->sdata;
1685 hdr = (struct ieee80211_hdr *) skb->data;
1686 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1687 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1689 if (!ieee80211_is_data(hdr->frame_control))
1694 return RX_DROP_MONITOR;
1696 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1697 struct mesh_path *mppath;
1701 if (is_multicast_ether_addr(hdr->addr1)) {
1702 mpp_addr = hdr->addr3;
1703 proxied_addr = mesh_hdr->eaddr1;
1705 mpp_addr = hdr->addr4;
1706 proxied_addr = mesh_hdr->eaddr2;
1710 mppath = mpp_path_lookup(proxied_addr, sdata);
1712 mpp_path_add(proxied_addr, mpp_addr, sdata);
1714 spin_lock_bh(&mppath->state_lock);
1715 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1716 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1717 spin_unlock_bh(&mppath->state_lock);
1722 /* Frame has reached destination. Don't forward */
1723 if (!is_multicast_ether_addr(hdr->addr1) &&
1724 compare_ether_addr(sdata->dev->dev_addr, hdr->addr3) == 0)
1729 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1731 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1732 dropped_frames_ttl);
1734 struct ieee80211_hdr *fwd_hdr;
1735 struct ieee80211_tx_info *info;
1737 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1739 if (!fwd_skb && net_ratelimit())
1740 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1743 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1744 memcpy(fwd_hdr->addr2, sdata->dev->dev_addr, ETH_ALEN);
1745 info = IEEE80211_SKB_CB(fwd_skb);
1746 memset(info, 0, sizeof(*info));
1747 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1748 info->control.vif = &rx->sdata->vif;
1749 ieee80211_select_queue(local, fwd_skb);
1750 if (is_multicast_ether_addr(fwd_hdr->addr1))
1751 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1756 * Save TA to addr1 to send TA a path error if a
1757 * suitable next hop is not found
1759 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1761 err = mesh_nexthop_lookup(fwd_skb, sdata);
1762 /* Failed to immediately resolve next hop:
1763 * fwded frame was dropped or will be added
1764 * later to the pending skb queue. */
1766 return RX_DROP_MONITOR;
1768 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1771 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1773 ieee80211_add_pending_skb(local, fwd_skb);
1777 if (is_multicast_ether_addr(hdr->addr1) ||
1778 sdata->dev->flags & IFF_PROMISC)
1781 return RX_DROP_MONITOR;
1785 static ieee80211_rx_result debug_noinline
1786 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1788 struct ieee80211_sub_if_data *sdata = rx->sdata;
1789 struct net_device *dev = sdata->dev;
1790 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1791 __le16 fc = hdr->frame_control;
1794 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1797 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1798 return RX_DROP_MONITOR;
1801 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1802 * that a 4-addr station can be detected and moved into a separate VLAN
1804 if (ieee80211_has_a4(hdr->frame_control) &&
1805 sdata->vif.type == NL80211_IFTYPE_AP)
1806 return RX_DROP_MONITOR;
1808 err = __ieee80211_data_to_8023(rx);
1810 return RX_DROP_UNUSABLE;
1812 if (!ieee80211_frame_allowed(rx, fc))
1813 return RX_DROP_MONITOR;
1817 dev->stats.rx_packets++;
1818 dev->stats.rx_bytes += rx->skb->len;
1820 ieee80211_deliver_skb(rx);
1825 static ieee80211_rx_result debug_noinline
1826 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
1828 struct ieee80211_local *local = rx->local;
1829 struct ieee80211_hw *hw = &local->hw;
1830 struct sk_buff *skb = rx->skb;
1831 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1832 struct tid_ampdu_rx *tid_agg_rx;
1836 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1839 if (ieee80211_is_back_req(bar->frame_control)) {
1841 return RX_DROP_MONITOR;
1842 tid = le16_to_cpu(bar->control) >> 12;
1843 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1844 != HT_AGG_STATE_OPERATIONAL)
1845 return RX_DROP_MONITOR;
1846 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1848 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1850 /* reset session timer */
1851 if (tid_agg_rx->timeout)
1852 mod_timer(&tid_agg_rx->session_timer,
1853 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1855 /* release stored frames up to start of BAR */
1856 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1865 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1866 struct ieee80211_mgmt *mgmt,
1869 struct ieee80211_local *local = sdata->local;
1870 struct sk_buff *skb;
1871 struct ieee80211_mgmt *resp;
1873 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1874 /* Not to own unicast address */
1878 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1879 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1880 /* Not from the current AP or not associated yet. */
1884 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1885 /* Too short SA Query request frame */
1889 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1893 skb_reserve(skb, local->hw.extra_tx_headroom);
1894 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1895 memset(resp, 0, 24);
1896 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1897 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1898 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1899 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1900 IEEE80211_STYPE_ACTION);
1901 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1902 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1903 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1904 memcpy(resp->u.action.u.sa_query.trans_id,
1905 mgmt->u.action.u.sa_query.trans_id,
1906 WLAN_SA_QUERY_TR_ID_LEN);
1908 ieee80211_tx_skb(sdata, skb);
1911 static ieee80211_rx_result debug_noinline
1912 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1914 struct ieee80211_local *local = rx->local;
1915 struct ieee80211_sub_if_data *sdata = rx->sdata;
1916 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1917 int len = rx->skb->len;
1919 if (!ieee80211_is_action(mgmt->frame_control))
1923 return RX_DROP_MONITOR;
1925 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1926 return RX_DROP_MONITOR;
1928 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1929 return RX_DROP_MONITOR;
1931 /* all categories we currently handle have action_code */
1932 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1933 return RX_DROP_MONITOR;
1935 switch (mgmt->u.action.category) {
1936 case WLAN_CATEGORY_BACK:
1938 * The aggregation code is not prepared to handle
1939 * anything but STA/AP due to the BSSID handling;
1940 * IBSS could work in the code but isn't supported
1941 * by drivers or the standard.
1943 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1944 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1945 sdata->vif.type != NL80211_IFTYPE_AP)
1946 return RX_DROP_MONITOR;
1948 switch (mgmt->u.action.u.addba_req.action_code) {
1949 case WLAN_ACTION_ADDBA_REQ:
1950 if (len < (IEEE80211_MIN_ACTION_SIZE +
1951 sizeof(mgmt->u.action.u.addba_req)))
1952 return RX_DROP_MONITOR;
1953 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1955 case WLAN_ACTION_ADDBA_RESP:
1956 if (len < (IEEE80211_MIN_ACTION_SIZE +
1957 sizeof(mgmt->u.action.u.addba_resp)))
1958 return RX_DROP_MONITOR;
1959 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1961 case WLAN_ACTION_DELBA:
1962 if (len < (IEEE80211_MIN_ACTION_SIZE +
1963 sizeof(mgmt->u.action.u.delba)))
1964 return RX_DROP_MONITOR;
1965 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1969 case WLAN_CATEGORY_SPECTRUM_MGMT:
1970 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1971 return RX_DROP_MONITOR;
1973 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1974 return RX_DROP_MONITOR;
1976 switch (mgmt->u.action.u.measurement.action_code) {
1977 case WLAN_ACTION_SPCT_MSR_REQ:
1978 if (len < (IEEE80211_MIN_ACTION_SIZE +
1979 sizeof(mgmt->u.action.u.measurement)))
1980 return RX_DROP_MONITOR;
1981 ieee80211_process_measurement_req(sdata, mgmt, len);
1983 case WLAN_ACTION_SPCT_CHL_SWITCH:
1984 if (len < (IEEE80211_MIN_ACTION_SIZE +
1985 sizeof(mgmt->u.action.u.chan_switch)))
1986 return RX_DROP_MONITOR;
1988 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1989 return RX_DROP_MONITOR;
1991 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1992 return RX_DROP_MONITOR;
1994 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1997 case WLAN_CATEGORY_SA_QUERY:
1998 if (len < (IEEE80211_MIN_ACTION_SIZE +
1999 sizeof(mgmt->u.action.u.sa_query)))
2000 return RX_DROP_MONITOR;
2001 switch (mgmt->u.action.u.sa_query.action) {
2002 case WLAN_ACTION_SA_QUERY_REQUEST:
2003 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2004 return RX_DROP_MONITOR;
2005 ieee80211_process_sa_query_req(sdata, mgmt, len);
2007 case WLAN_ACTION_SA_QUERY_RESPONSE:
2009 * SA Query response is currently only used in AP mode
2010 * and it is processed in user space.
2019 rx->sta->rx_packets++;
2020 dev_kfree_skb(rx->skb);
2024 static ieee80211_rx_result debug_noinline
2025 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2027 struct ieee80211_sub_if_data *sdata = rx->sdata;
2028 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2030 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
2031 return RX_DROP_MONITOR;
2033 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
2034 return RX_DROP_MONITOR;
2036 if (ieee80211_vif_is_mesh(&sdata->vif))
2037 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
2039 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2040 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
2042 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2043 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
2045 return RX_DROP_MONITOR;
2048 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
2049 struct ieee80211_rx_data *rx)
2052 unsigned int hdrlen;
2054 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2055 if (rx->skb->len >= hdrlen + 4)
2056 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2062 * Some hardware seem to generate incorrect Michael MIC
2063 * reports; ignore them to avoid triggering countermeasures.
2068 if (!ieee80211_has_protected(hdr->frame_control))
2071 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
2073 * APs with pairwise keys should never receive Michael MIC
2074 * errors for non-zero keyidx because these are reserved for
2075 * group keys and only the AP is sending real multicast
2076 * frames in the BSS.
2081 if (!ieee80211_is_data(hdr->frame_control) &&
2082 !ieee80211_is_auth(hdr->frame_control))
2085 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2089 /* TODO: use IEEE80211_RX_FRAGMENTED */
2090 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2091 struct ieee80211_rate *rate)
2093 struct ieee80211_sub_if_data *sdata;
2094 struct ieee80211_local *local = rx->local;
2095 struct ieee80211_rtap_hdr {
2096 struct ieee80211_radiotap_header hdr;
2101 } __attribute__ ((packed)) *rthdr;
2102 struct sk_buff *skb = rx->skb, *skb2;
2103 struct net_device *prev_dev = NULL;
2104 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2106 if (status->flag & RX_FLAG_INTERNAL_CMTR)
2109 if (skb_headroom(skb) < sizeof(*rthdr) &&
2110 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2113 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2114 memset(rthdr, 0, sizeof(*rthdr));
2115 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2116 rthdr->hdr.it_present =
2117 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2118 (1 << IEEE80211_RADIOTAP_CHANNEL));
2121 rthdr->rate_or_pad = rate->bitrate / 5;
2122 rthdr->hdr.it_present |=
2123 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2125 rthdr->chan_freq = cpu_to_le16(status->freq);
2127 if (status->band == IEEE80211_BAND_5GHZ)
2128 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2129 IEEE80211_CHAN_5GHZ);
2131 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2132 IEEE80211_CHAN_2GHZ);
2134 skb_set_mac_header(skb, 0);
2135 skb->ip_summed = CHECKSUM_UNNECESSARY;
2136 skb->pkt_type = PACKET_OTHERHOST;
2137 skb->protocol = htons(ETH_P_802_2);
2139 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2140 if (!netif_running(sdata->dev))
2143 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2144 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2148 skb2 = skb_clone(skb, GFP_ATOMIC);
2150 skb2->dev = prev_dev;
2155 prev_dev = sdata->dev;
2156 sdata->dev->stats.rx_packets++;
2157 sdata->dev->stats.rx_bytes += skb->len;
2161 skb->dev = prev_dev;
2167 status->flag |= RX_FLAG_INTERNAL_CMTR;
2175 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
2176 struct ieee80211_rx_data *rx,
2177 struct sk_buff *skb,
2178 struct ieee80211_rate *rate)
2180 struct sk_buff_head reorder_release;
2181 ieee80211_rx_result res = RX_DROP_MONITOR;
2183 __skb_queue_head_init(&reorder_release);
2188 #define CALL_RXH(rxh) \
2191 if (res != RX_CONTINUE) \
2196 * NB: the rxh_next label works even if we jump
2197 * to it from here because then the list will
2198 * be empty, which is a trivial check
2200 CALL_RXH(ieee80211_rx_h_passive_scan)
2201 CALL_RXH(ieee80211_rx_h_check)
2203 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2205 while ((skb = __skb_dequeue(&reorder_release))) {
2207 * all the other fields are valid across frames
2208 * that belong to an aMPDU since they are on the
2209 * same TID from the same station
2213 CALL_RXH(ieee80211_rx_h_decrypt)
2214 CALL_RXH(ieee80211_rx_h_check_more_data)
2215 CALL_RXH(ieee80211_rx_h_sta_process)
2216 CALL_RXH(ieee80211_rx_h_defragment)
2217 CALL_RXH(ieee80211_rx_h_ps_poll)
2218 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2219 /* must be after MMIC verify so header is counted in MPDU mic */
2220 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2221 CALL_RXH(ieee80211_rx_h_amsdu)
2222 #ifdef CONFIG_MAC80211_MESH
2223 if (ieee80211_vif_is_mesh(&sdata->vif))
2224 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2226 CALL_RXH(ieee80211_rx_h_data)
2228 /* special treatment -- needs the queue */
2229 res = ieee80211_rx_h_ctrl(rx, &reorder_release);
2230 if (res != RX_CONTINUE)
2233 CALL_RXH(ieee80211_rx_h_action)
2234 CALL_RXH(ieee80211_rx_h_mgmt)
2240 case RX_DROP_MONITOR:
2241 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2243 rx->sta->rx_dropped++;
2246 ieee80211_rx_cooked_monitor(rx, rate);
2248 case RX_DROP_UNUSABLE:
2249 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2251 rx->sta->rx_dropped++;
2252 dev_kfree_skb(rx->skb);
2255 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2261 /* main receive path */
2263 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2264 struct ieee80211_rx_data *rx,
2265 struct ieee80211_hdr *hdr)
2267 struct sk_buff *skb = rx->skb;
2268 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2269 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2270 int multicast = is_multicast_ether_addr(hdr->addr1);
2272 switch (sdata->vif.type) {
2273 case NL80211_IFTYPE_STATION:
2274 if (!bssid && !sdata->u.mgd.use_4addr)
2277 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
2278 if (!(sdata->dev->flags & IFF_PROMISC))
2280 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2283 case NL80211_IFTYPE_ADHOC:
2286 if (ieee80211_is_beacon(hdr->frame_control)) {
2289 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2290 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2292 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2293 } else if (!multicast &&
2294 compare_ether_addr(sdata->dev->dev_addr,
2296 if (!(sdata->dev->flags & IFF_PROMISC))
2298 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2299 } else if (!rx->sta) {
2301 if (status->flag & RX_FLAG_HT)
2302 rate_idx = 0; /* TODO: HT rates */
2304 rate_idx = status->rate_idx;
2305 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2309 case NL80211_IFTYPE_MESH_POINT:
2311 compare_ether_addr(sdata->dev->dev_addr,
2313 if (!(sdata->dev->flags & IFF_PROMISC))
2316 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2319 case NL80211_IFTYPE_AP_VLAN:
2320 case NL80211_IFTYPE_AP:
2322 if (compare_ether_addr(sdata->dev->dev_addr,
2325 } else if (!ieee80211_bssid_match(bssid,
2326 sdata->dev->dev_addr)) {
2327 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2329 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2332 case NL80211_IFTYPE_WDS:
2333 if (bssid || !ieee80211_is_data(hdr->frame_control))
2335 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2338 case NL80211_IFTYPE_MONITOR:
2339 case NL80211_IFTYPE_UNSPECIFIED:
2340 case __NL80211_IFTYPE_AFTER_LAST:
2341 /* should never get here */
2350 * This is the actual Rx frames handler. as it blongs to Rx path it must
2351 * be called with rcu_read_lock protection.
2353 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2354 struct sk_buff *skb,
2355 struct ieee80211_rate *rate)
2357 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2358 struct ieee80211_local *local = hw_to_local(hw);
2359 struct ieee80211_sub_if_data *sdata;
2360 struct ieee80211_hdr *hdr;
2361 struct ieee80211_rx_data rx;
2363 struct ieee80211_sub_if_data *prev = NULL;
2364 struct sk_buff *skb_new;
2366 hdr = (struct ieee80211_hdr *)skb->data;
2367 memset(&rx, 0, sizeof(rx));
2371 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2372 local->dot11ReceivedFragmentCount++;
2374 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2375 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2376 rx.flags |= IEEE80211_RX_IN_SCAN;
2378 ieee80211_parse_qos(&rx);
2379 ieee80211_verify_alignment(&rx);
2381 rx.sta = sta_info_get(local, hdr->addr2);
2383 rx.sdata = rx.sta->sdata;
2385 if (rx.sdata && ieee80211_is_data(hdr->frame_control)) {
2386 rx.flags |= IEEE80211_RX_RA_MATCH;
2387 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2389 if (status->flag & RX_FLAG_MMIC_ERROR) {
2390 if (rx.flags & IEEE80211_RX_RA_MATCH)
2391 ieee80211_rx_michael_mic_report(hdr, &rx);
2395 } else list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2396 if (!netif_running(sdata->dev))
2399 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2400 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2403 rx.flags |= IEEE80211_RX_RA_MATCH;
2404 prepares = prepare_for_handlers(sdata, &rx, hdr);
2409 if (status->flag & RX_FLAG_MMIC_ERROR) {
2411 if (rx.flags & IEEE80211_RX_RA_MATCH)
2412 ieee80211_rx_michael_mic_report(hdr, &rx);
2417 * frame is destined for this interface, but if it's not
2418 * also for the previous one we handle that after the
2419 * loop to avoid copying the SKB once too much
2428 * frame was destined for the previous interface
2429 * so invoke RX handlers for it
2432 skb_new = skb_copy(skb, GFP_ATOMIC);
2434 if (net_ratelimit())
2435 printk(KERN_DEBUG "%s: failed to copy "
2436 "multicast frame for %s\n",
2437 wiphy_name(local->hw.wiphy),
2441 ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate);
2445 ieee80211_invoke_rx_handlers(prev, &rx, skb, rate);
2451 * This is the receive path handler. It is called by a low level driver when an
2452 * 802.11 MPDU is received from the hardware.
2454 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2456 struct ieee80211_local *local = hw_to_local(hw);
2457 struct ieee80211_rate *rate = NULL;
2458 struct ieee80211_supported_band *sband;
2459 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2461 WARN_ON_ONCE(softirq_count() == 0);
2463 if (WARN_ON(status->band < 0 ||
2464 status->band >= IEEE80211_NUM_BANDS))
2467 sband = local->hw.wiphy->bands[status->band];
2468 if (WARN_ON(!sband))
2472 * If we're suspending, it is possible although not too likely
2473 * that we'd be receiving frames after having already partially
2474 * quiesced the stack. We can't process such frames then since
2475 * that might, for example, cause stations to be added or other
2476 * driver callbacks be invoked.
2478 if (unlikely(local->quiescing || local->suspended))
2482 * The same happens when we're not even started,
2483 * but that's worth a warning.
2485 if (WARN_ON(!local->started))
2488 if (status->flag & RX_FLAG_HT) {
2490 * rate_idx is MCS index, which can be [0-76] as documented on:
2492 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2494 * Anything else would be some sort of driver or hardware error.
2495 * The driver should catch hardware errors.
2497 if (WARN((status->rate_idx < 0 ||
2498 status->rate_idx > 76),
2499 "Rate marked as an HT rate but passed "
2500 "status->rate_idx is not "
2501 "an MCS index [0-76]: %d (0x%02x)\n",
2506 if (WARN_ON(status->rate_idx < 0 ||
2507 status->rate_idx >= sband->n_bitrates))
2509 rate = &sband->bitrates[status->rate_idx];
2513 * key references and virtual interfaces are protected using RCU
2514 * and this requires that we are in a read-side RCU section during
2515 * receive processing
2520 * Frames with failed FCS/PLCP checksum are not returned,
2521 * all other frames are returned without radiotap header
2522 * if it was previously present.
2523 * Also, frames with less than 16 bytes are dropped.
2525 skb = ieee80211_rx_monitor(local, skb, rate);
2531 __ieee80211_rx_handle_packet(hw, skb, rate);
2539 EXPORT_SYMBOL(ieee80211_rx);
2541 /* This is a version of the rx handler that can be called from hard irq
2542 * context. Post the skb on the queue and schedule the tasklet */
2543 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2545 struct ieee80211_local *local = hw_to_local(hw);
2547 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2549 skb->pkt_type = IEEE80211_RX_MSG;
2550 skb_queue_tail(&local->skb_queue, skb);
2551 tasklet_schedule(&local->tasklet);
2553 EXPORT_SYMBOL(ieee80211_rx_irqsafe);