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/kernel.h>
13 #include <linux/skbuff.h>
14 #include <linux/netdevice.h>
15 #include <linux/etherdevice.h>
16 #include <linux/rcupdate.h>
17 #include <net/mac80211.h>
18 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "ieee80211_led.h"
28 * monitor mode reception
30 * This function cleans up the SKB, i.e. it removes all the stuff
31 * only useful for monitoring.
33 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
37 skb_pull(skb, rtap_len);
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 ieee80211_rx_status *status,
58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
62 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
64 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
65 cpu_to_le16(IEEE80211_FTYPE_CTL))
71 * This function copies a received frame to all monitor interfaces and
72 * returns a cleaned-up SKB that no longer includes the FCS nor the
73 * radiotap header the driver might have added.
75 static struct sk_buff *
76 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
77 struct ieee80211_rx_status *status)
79 struct ieee80211_sub_if_data *sdata;
80 struct ieee80211_rate *rate;
81 int needed_headroom = 0;
82 struct ieee80211_rtap_hdr {
83 struct ieee80211_radiotap_header hdr;
89 u8 padding_for_rxflags;
91 } __attribute__ ((packed)) *rthdr;
92 struct sk_buff *skb, *skb2;
93 struct net_device *prev_dev = NULL;
94 int present_fcs_len = 0;
98 * First, we may need to make a copy of the skb because
99 * (1) we need to modify it for radiotap (if not present), and
100 * (2) the other RX handlers will modify the skb we got.
102 * We don't need to, of course, if we aren't going to return
103 * the SKB because it has a bad FCS/PLCP checksum.
105 if (status->flag & RX_FLAG_RADIOTAP)
106 rtap_len = ieee80211_get_radiotap_len(origskb->data);
108 needed_headroom = sizeof(*rthdr);
110 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
111 present_fcs_len = FCS_LEN;
113 if (!local->monitors) {
114 if (should_drop_frame(status, origskb, present_fcs_len,
116 dev_kfree_skb(origskb);
120 return remove_monitor_info(local, origskb, rtap_len);
123 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
124 /* only need to expand headroom if necessary */
129 * This shouldn't trigger often because most devices have an
130 * RX header they pull before we get here, and that should
131 * be big enough for our radiotap information. We should
132 * probably export the length to drivers so that we can have
133 * them allocate enough headroom to start with.
135 if (skb_headroom(skb) < needed_headroom &&
136 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
142 * Need to make a copy and possibly remove radiotap header
143 * and FCS from the original.
145 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
147 origskb = remove_monitor_info(local, origskb, rtap_len);
153 /* if necessary, prepend radiotap information */
154 if (!(status->flag & RX_FLAG_RADIOTAP)) {
155 rthdr = (void *) skb_push(skb, sizeof(*rthdr));
156 memset(rthdr, 0, sizeof(*rthdr));
157 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
158 rthdr->hdr.it_present =
159 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
160 (1 << IEEE80211_RADIOTAP_RATE) |
161 (1 << IEEE80211_RADIOTAP_CHANNEL) |
162 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) |
163 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
164 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
165 IEEE80211_RADIOTAP_F_FCS : 0;
167 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
170 (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
172 cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
174 rate = ieee80211_get_rate(local, status->phymode,
177 rthdr->rate = rate->rate / 5;
179 rthdr->chan_freq = cpu_to_le16(status->freq);
181 if (status->phymode == MODE_IEEE80211A)
183 cpu_to_le16(IEEE80211_CHAN_OFDM |
184 IEEE80211_CHAN_5GHZ);
187 cpu_to_le16(IEEE80211_CHAN_DYN |
188 IEEE80211_CHAN_2GHZ);
190 rthdr->antsignal = status->ssi;
193 skb_set_mac_header(skb, 0);
194 skb->ip_summed = CHECKSUM_UNNECESSARY;
195 skb->pkt_type = PACKET_OTHERHOST;
196 skb->protocol = htons(ETH_P_802_2);
198 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
199 if (!netif_running(sdata->dev))
202 if (sdata->type != IEEE80211_IF_TYPE_MNTR)
206 skb2 = skb_clone(skb, GFP_ATOMIC);
208 skb2->dev = prev_dev;
213 prev_dev = sdata->dev;
214 sdata->dev->stats.rx_packets++;
215 sdata->dev->stats.rx_bytes += skb->len;
230 * these don't have dev/sdata fields in the rx data
231 * The sta value should also not be used because it may
232 * be NULL even though a STA (in IBSS mode) will be added.
235 static ieee80211_txrx_result
236 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
238 u8 *data = rx->skb->data;
241 /* does the frame have a qos control field? */
242 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
243 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
244 /* frame has qos control */
245 tid = qc[0] & QOS_CONTROL_TID_MASK;
247 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
248 /* Separate TID for management frames */
249 tid = NUM_RX_DATA_QUEUES - 1;
251 /* no qos control present */
252 tid = 0; /* 802.1d - Best Effort */
256 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
257 /* only a debug counter, sta might not be assigned properly yet */
259 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
261 rx->u.rx.queue = tid;
262 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
263 * For now, set skb->priority to 0 for other cases. */
264 rx->skb->priority = (tid > 7) ? 0 : tid;
266 return TXRX_CONTINUE;
269 static ieee80211_txrx_result
270 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
272 struct ieee80211_local *local = rx->local;
273 struct sk_buff *skb = rx->skb;
274 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
275 u32 load = 0, hdrtime;
276 struct ieee80211_rate *rate;
277 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
280 /* Estimate total channel use caused by this frame */
282 if (unlikely(mode->num_rates < 0))
283 return TXRX_CONTINUE;
285 rate = &mode->rates[0];
286 for (i = 0; i < mode->num_rates; i++) {
287 if (mode->rates[i].val == rx->u.rx.status->rate) {
288 rate = &mode->rates[i];
293 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
294 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
296 if (mode->mode == MODE_IEEE80211A ||
297 (mode->mode == MODE_IEEE80211G &&
298 rate->flags & IEEE80211_RATE_ERP))
299 hdrtime = CHAN_UTIL_HDR_SHORT;
301 hdrtime = CHAN_UTIL_HDR_LONG;
304 if (!is_multicast_ether_addr(hdr->addr1))
307 load += skb->len * rate->rate_inv;
309 /* Divide channel_use by 8 to avoid wrapping around the counter */
310 load >>= CHAN_UTIL_SHIFT;
311 local->channel_use_raw += load;
312 rx->u.rx.load = load;
314 return TXRX_CONTINUE;
317 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
319 ieee80211_rx_h_parse_qos,
320 ieee80211_rx_h_load_stats,
326 static ieee80211_txrx_result
327 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
330 rx->sta->channel_use_raw += rx->u.rx.load;
331 rx->sdata->channel_use_raw += rx->u.rx.load;
332 return TXRX_CONTINUE;
335 static ieee80211_txrx_result
336 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
338 struct ieee80211_local *local = rx->local;
339 struct sk_buff *skb = rx->skb;
341 if (unlikely(local->sta_hw_scanning))
342 return ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
344 if (unlikely(local->sta_sw_scanning)) {
345 /* drop all the other packets during a software scan anyway */
346 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status)
352 if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
353 /* scanning finished during invoking of handlers */
354 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
358 return TXRX_CONTINUE;
361 static ieee80211_txrx_result
362 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
364 struct ieee80211_hdr *hdr;
365 hdr = (struct ieee80211_hdr *) rx->skb->data;
367 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
368 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
369 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
370 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
372 if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
373 rx->local->dot11FrameDuplicateCount++;
374 rx->sta->num_duplicates++;
378 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
381 if (unlikely(rx->skb->len < 16)) {
382 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
386 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
387 rx->skb->pkt_type = PACKET_OTHERHOST;
388 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
389 rx->skb->pkt_type = PACKET_HOST;
390 else if (is_multicast_ether_addr(hdr->addr1)) {
391 if (is_broadcast_ether_addr(hdr->addr1))
392 rx->skb->pkt_type = PACKET_BROADCAST;
394 rx->skb->pkt_type = PACKET_MULTICAST;
396 rx->skb->pkt_type = PACKET_OTHERHOST;
398 /* Drop disallowed frame classes based on STA auth/assoc state;
399 * IEEE 802.11, Chap 5.5.
401 * 80211.o does filtering only based on association state, i.e., it
402 * drops Class 3 frames from not associated stations. hostapd sends
403 * deauth/disassoc frames when needed. In addition, hostapd is
404 * responsible for filtering on both auth and assoc states.
406 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
407 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
408 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
409 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
410 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
411 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
412 !(rx->fc & IEEE80211_FCTL_TODS) &&
413 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
414 || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
415 /* Drop IBSS frames and frames for other hosts
423 return TXRX_CONTINUE;
427 static ieee80211_txrx_result
428 ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
430 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
433 ieee80211_txrx_result result = TXRX_DROP;
434 struct ieee80211_key *stakey = NULL;
439 * There are three types of keys:
441 * - PTK (pairwise keys)
442 * - STK (station-to-station pairwise keys)
444 * When selecting a key, we have to distinguish between multicast
445 * (including broadcast) and unicast frames, the latter can only
446 * use PTKs and STKs while the former always use GTKs. Unless, of
447 * course, actual WEP keys ("pre-RSNA") are used, then unicast
448 * frames can also use key indizes like GTKs. Hence, if we don't
449 * have a PTK/STK we check the key index for a WEP key.
451 * Note that in a regular BSS, multicast frames are sent by the
452 * AP only, associated stations unicast the frame to the AP first
453 * which then multicasts it on their behalf.
455 * There is also a slight problem in IBSS mode: GTKs are negotiated
456 * with each station, that is something we don't currently handle.
457 * The spec seems to expect that one negotiates the same key with
458 * every station but there's no such requirement; VLANs could be
462 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
463 return TXRX_CONTINUE;
466 * No point in finding a key and decrypting if the frame is neither
467 * addressed to us nor a multicast frame.
469 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
470 return TXRX_CONTINUE;
473 stakey = rcu_dereference(rx->sta->key);
475 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
479 * The device doesn't give us the IV so we won't be
480 * able to look up the key. That's ok though, we
481 * don't need to decrypt the frame, we just won't
482 * be able to keep statistics accurate.
483 * Except for key threshold notifications, should
484 * we somehow allow the driver to tell us which key
485 * the hardware used if this flag is set?
487 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
488 (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
489 return TXRX_CONTINUE;
491 hdrlen = ieee80211_get_hdrlen(rx->fc);
493 if (rx->skb->len < 8 + hdrlen)
494 return TXRX_DROP; /* TODO: count this? */
497 * no need to call ieee80211_wep_get_keyidx,
498 * it verifies a bunch of things we've done already
500 keyidx = rx->skb->data[hdrlen + 3] >> 6;
502 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
505 * RSNA-protected unicast frames should always be sent with
506 * pairwise or station-to-station keys, but for WEP we allow
507 * using a key index as well.
509 if (rx->key && rx->key->conf.alg != ALG_WEP &&
510 !is_multicast_ether_addr(hdr->addr1))
515 rx->key->tx_rx_count++;
516 /* TODO: add threshold stuff again */
518 #ifdef CONFIG_MAC80211_DEBUG
520 printk(KERN_DEBUG "%s: RX protected frame,"
521 " but have no key\n", rx->dev->name);
522 #endif /* CONFIG_MAC80211_DEBUG */
526 /* Check for weak IVs if possible */
527 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
528 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
529 (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
530 !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
531 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
532 rx->sta->wep_weak_iv_count++;
534 switch (rx->key->conf.alg) {
536 result = ieee80211_crypto_wep_decrypt(rx);
539 result = ieee80211_crypto_tkip_decrypt(rx);
542 result = ieee80211_crypto_ccmp_decrypt(rx);
546 /* either the frame has been decrypted or will be dropped */
547 rx->u.rx.status->flag |= RX_FLAG_DECRYPTED;
552 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
554 struct ieee80211_sub_if_data *sdata;
555 DECLARE_MAC_BUF(mac);
557 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
560 atomic_inc(&sdata->bss->num_sta_ps);
561 sta->flags |= WLAN_STA_PS;
563 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
564 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
565 dev->name, print_mac(mac, sta->addr), sta->aid);
566 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
569 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
571 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
574 struct ieee80211_sub_if_data *sdata;
575 struct ieee80211_tx_packet_data *pkt_data;
576 DECLARE_MAC_BUF(mac);
578 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
580 atomic_dec(&sdata->bss->num_sta_ps);
581 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
583 if (!skb_queue_empty(&sta->ps_tx_buf)) {
584 if (local->ops->set_tim)
585 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
587 bss_tim_clear(local, sdata->bss, sta->aid);
589 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
590 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
591 dev->name, print_mac(mac, sta->addr), sta->aid);
592 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
593 /* Send all buffered frames to the station */
594 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
595 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
597 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
600 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
601 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
602 local->total_ps_buffered--;
604 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
605 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
606 "since STA not sleeping anymore\n", dev->name,
607 print_mac(mac, sta->addr), sta->aid);
608 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
609 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
616 static ieee80211_txrx_result
617 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
619 struct sta_info *sta = rx->sta;
620 struct net_device *dev = rx->dev;
621 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
624 return TXRX_CONTINUE;
626 /* Update last_rx only for IBSS packets which are for the current
627 * BSSID to avoid keeping the current IBSS network alive in cases where
628 * other STAs are using different BSSID. */
629 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
630 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
631 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
632 sta->last_rx = jiffies;
634 if (!is_multicast_ether_addr(hdr->addr1) ||
635 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
636 /* Update last_rx only for unicast frames in order to prevent
637 * the Probe Request frames (the only broadcast frames from a
638 * STA in infrastructure mode) from keeping a connection alive.
640 sta->last_rx = jiffies;
643 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
644 return TXRX_CONTINUE;
647 sta->rx_bytes += rx->skb->len;
648 sta->last_rssi = rx->u.rx.status->ssi;
649 sta->last_signal = rx->u.rx.status->signal;
650 sta->last_noise = rx->u.rx.status->noise;
652 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
653 /* Change STA power saving mode only in the end of a frame
654 * exchange sequence */
655 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
656 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
657 else if (!(sta->flags & WLAN_STA_PS) &&
658 (rx->fc & IEEE80211_FCTL_PM))
659 ap_sta_ps_start(dev, sta);
662 /* Drop data::nullfunc frames silently, since they are used only to
663 * control station power saving mode. */
664 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
665 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
666 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
667 /* Update counter and free packet here to avoid counting this
668 * as a dropped packed. */
670 dev_kfree_skb(rx->skb);
674 return TXRX_CONTINUE;
675 } /* ieee80211_rx_h_sta_process */
677 static inline struct ieee80211_fragment_entry *
678 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
679 unsigned int frag, unsigned int seq, int rx_queue,
680 struct sk_buff **skb)
682 struct ieee80211_fragment_entry *entry;
685 idx = sdata->fragment_next;
686 entry = &sdata->fragments[sdata->fragment_next++];
687 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
688 sdata->fragment_next = 0;
690 if (!skb_queue_empty(&entry->skb_list)) {
691 #ifdef CONFIG_MAC80211_DEBUG
692 struct ieee80211_hdr *hdr =
693 (struct ieee80211_hdr *) entry->skb_list.next->data;
694 DECLARE_MAC_BUF(mac);
695 DECLARE_MAC_BUF(mac2);
696 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
697 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
698 "addr1=%s addr2=%s\n",
699 sdata->dev->name, idx,
700 jiffies - entry->first_frag_time, entry->seq,
701 entry->last_frag, print_mac(mac, hdr->addr1),
702 print_mac(mac2, hdr->addr2));
703 #endif /* CONFIG_MAC80211_DEBUG */
704 __skb_queue_purge(&entry->skb_list);
707 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
709 entry->first_frag_time = jiffies;
711 entry->rx_queue = rx_queue;
712 entry->last_frag = frag;
714 entry->extra_len = 0;
719 static inline struct ieee80211_fragment_entry *
720 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
721 u16 fc, unsigned int frag, unsigned int seq,
722 int rx_queue, struct ieee80211_hdr *hdr)
724 struct ieee80211_fragment_entry *entry;
727 idx = sdata->fragment_next;
728 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
729 struct ieee80211_hdr *f_hdr;
734 idx = IEEE80211_FRAGMENT_MAX - 1;
736 entry = &sdata->fragments[idx];
737 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
738 entry->rx_queue != rx_queue ||
739 entry->last_frag + 1 != frag)
742 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
743 f_fc = le16_to_cpu(f_hdr->frame_control);
745 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
746 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
747 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
750 if (entry->first_frag_time + 2 * HZ < jiffies) {
751 __skb_queue_purge(&entry->skb_list);
760 static ieee80211_txrx_result
761 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
763 struct ieee80211_hdr *hdr;
765 unsigned int frag, seq;
766 struct ieee80211_fragment_entry *entry;
768 DECLARE_MAC_BUF(mac);
770 hdr = (struct ieee80211_hdr *) rx->skb->data;
771 sc = le16_to_cpu(hdr->seq_ctrl);
772 frag = sc & IEEE80211_SCTL_FRAG;
774 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
775 (rx->skb)->len < 24 ||
776 is_multicast_ether_addr(hdr->addr1))) {
780 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
782 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
785 /* This is the first fragment of a new frame. */
786 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
787 rx->u.rx.queue, &(rx->skb));
788 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
789 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
790 /* Store CCMP PN so that we can verify that the next
791 * fragment has a sequential PN value. */
793 memcpy(entry->last_pn,
794 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
800 /* This is a fragment for a frame that should already be pending in
801 * fragment cache. Add this fragment to the end of the pending entry.
803 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
804 rx->u.rx.queue, hdr);
806 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
810 /* Verify that MPDUs within one MSDU have sequential PN values.
811 * (IEEE 802.11i, 8.3.3.4.5) */
814 u8 pn[CCMP_PN_LEN], *rpn;
815 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
817 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
818 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
823 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
824 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
826 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
828 " PN=%02x%02x%02x%02x%02x%02x "
829 "(expected %02x%02x%02x%02x%02x%02x)\n",
830 rx->dev->name, print_mac(mac, hdr->addr2),
831 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
832 rpn[5], pn[0], pn[1], pn[2], pn[3],
836 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
839 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
840 __skb_queue_tail(&entry->skb_list, rx->skb);
841 entry->last_frag = frag;
842 entry->extra_len += rx->skb->len;
843 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
848 rx->skb = __skb_dequeue(&entry->skb_list);
849 if (skb_tailroom(rx->skb) < entry->extra_len) {
850 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
851 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
853 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
854 __skb_queue_purge(&entry->skb_list);
858 while ((skb = __skb_dequeue(&entry->skb_list))) {
859 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
863 /* Complete frame has been reassembled - process it now */
864 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
868 rx->sta->rx_packets++;
869 if (is_multicast_ether_addr(hdr->addr1))
870 rx->local->dot11MulticastReceivedFrameCount++;
872 ieee80211_led_rx(rx->local);
873 return TXRX_CONTINUE;
876 static ieee80211_txrx_result
877 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
881 DECLARE_MAC_BUF(mac);
883 if (likely(!rx->sta ||
884 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
885 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
886 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
887 return TXRX_CONTINUE;
889 skb = skb_dequeue(&rx->sta->tx_filtered);
891 skb = skb_dequeue(&rx->sta->ps_tx_buf);
893 rx->local->total_ps_buffered--;
895 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
896 skb_queue_empty(&rx->sta->ps_tx_buf);
899 struct ieee80211_hdr *hdr =
900 (struct ieee80211_hdr *) skb->data;
902 /* tell TX path to send one frame even though the STA may
903 * still remain is PS mode after this frame exchange */
906 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
907 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
908 print_mac(mac, rx->sta->addr), rx->sta->aid,
909 skb_queue_len(&rx->sta->ps_tx_buf));
910 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
912 /* Use MoreData flag to indicate whether there are more
913 * buffered frames for this STA */
914 if (no_pending_pkts) {
915 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
916 rx->sta->flags &= ~WLAN_STA_TIM;
918 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
922 if (no_pending_pkts) {
923 if (rx->local->ops->set_tim)
924 rx->local->ops->set_tim(local_to_hw(rx->local),
927 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
929 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
930 } else if (!rx->u.rx.sent_ps_buffered) {
931 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
932 "though there is no buffered frames for it\n",
933 rx->dev->name, print_mac(mac, rx->sta->addr));
934 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
938 /* Free PS Poll skb here instead of returning TXRX_DROP that would
939 * count as an dropped frame. */
940 dev_kfree_skb(rx->skb);
945 static ieee80211_txrx_result
946 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
949 u8 *data = rx->skb->data;
950 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
952 if (!WLAN_FC_IS_QOS_DATA(fc))
953 return TXRX_CONTINUE;
955 /* remove the qos control field, update frame type and meta-data */
956 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
957 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
958 /* change frame type to non QOS */
959 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
960 hdr->frame_control = cpu_to_le16(fc);
962 return TXRX_CONTINUE;
966 ieee80211_drop_802_1x_pae(struct ieee80211_txrx_data *rx, int hdrlen)
968 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb, hdrlen) &&
969 rx->sdata->type != IEEE80211_IF_TYPE_STA &&
970 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
973 if (unlikely(rx->sdata->ieee802_1x &&
974 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
975 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
976 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
977 !ieee80211_is_eapol(rx->skb, hdrlen))) {
978 #ifdef CONFIG_MAC80211_DEBUG
979 printk(KERN_DEBUG "%s: dropped frame "
980 "(unauthorized port)\n", rx->dev->name);
981 #endif /* CONFIG_MAC80211_DEBUG */
989 ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx, int hdrlen)
992 * Pass through unencrypted frames if the hardware has
993 * decrypted them already.
995 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
998 /* Drop unencrypted frames if key is set. */
999 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1000 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1001 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1002 (rx->key || rx->sdata->drop_unencrypted) &&
1003 (rx->sdata->eapol == 0 ||
1004 !ieee80211_is_eapol(rx->skb, hdrlen)))) {
1005 if (net_ratelimit())
1006 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
1007 "encryption\n", rx->dev->name);
1014 ieee80211_data_to_8023(struct ieee80211_txrx_data *rx)
1016 struct net_device *dev = rx->dev;
1017 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1018 u16 fc, hdrlen, ethertype;
1022 struct sk_buff *skb = rx->skb;
1023 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1024 DECLARE_MAC_BUF(mac);
1025 DECLARE_MAC_BUF(mac2);
1026 DECLARE_MAC_BUF(mac3);
1027 DECLARE_MAC_BUF(mac4);
1031 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1034 hdrlen = ieee80211_get_hdrlen(fc);
1036 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1038 * IEEE 802.11 address fields:
1039 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1040 * 0 0 DA SA BSSID n/a
1041 * 0 1 DA BSSID SA n/a
1042 * 1 0 BSSID SA DA n/a
1046 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1047 case IEEE80211_FCTL_TODS:
1049 memcpy(dst, hdr->addr3, ETH_ALEN);
1050 memcpy(src, hdr->addr2, ETH_ALEN);
1052 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
1053 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
1054 if (net_ratelimit())
1055 printk(KERN_DEBUG "%s: dropped ToDS frame "
1056 "(BSSID=%s SA=%s DA=%s)\n",
1058 print_mac(mac, hdr->addr1),
1059 print_mac(mac2, hdr->addr2),
1060 print_mac(mac3, hdr->addr3));
1064 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1066 memcpy(dst, hdr->addr3, ETH_ALEN);
1067 memcpy(src, hdr->addr4, ETH_ALEN);
1069 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
1070 if (net_ratelimit())
1071 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
1072 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1074 print_mac(mac, hdr->addr1),
1075 print_mac(mac2, hdr->addr2),
1076 print_mac(mac3, hdr->addr3),
1077 print_mac(mac4, hdr->addr4));
1081 case IEEE80211_FCTL_FROMDS:
1083 memcpy(dst, hdr->addr1, ETH_ALEN);
1084 memcpy(src, hdr->addr3, ETH_ALEN);
1086 if (sdata->type != IEEE80211_IF_TYPE_STA ||
1087 (is_multicast_ether_addr(dst) &&
1088 !compare_ether_addr(src, dev->dev_addr)))
1093 memcpy(dst, hdr->addr1, ETH_ALEN);
1094 memcpy(src, hdr->addr2, ETH_ALEN);
1096 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1097 if (net_ratelimit()) {
1098 printk(KERN_DEBUG "%s: dropped IBSS frame "
1099 "(DA=%s SA=%s BSSID=%s)\n",
1101 print_mac(mac, hdr->addr1),
1102 print_mac(mac2, hdr->addr2),
1103 print_mac(mac3, hdr->addr3));
1110 if (unlikely(skb->len - hdrlen < 8)) {
1111 if (net_ratelimit()) {
1112 printk(KERN_DEBUG "%s: RX too short data frame "
1113 "payload\n", dev->name);
1118 payload = skb->data + hdrlen;
1119 ethertype = (payload[6] << 8) | payload[7];
1121 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1122 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1123 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1124 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1125 * replace EtherType */
1126 skb_pull(skb, hdrlen + 6);
1127 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1128 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1130 struct ethhdr *ehdr;
1132 skb_pull(skb, hdrlen);
1133 len = htons(skb->len);
1134 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1135 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1136 memcpy(ehdr->h_source, src, ETH_ALEN);
1137 ehdr->h_proto = len;
1143 ieee80211_deliver_skb(struct ieee80211_txrx_data *rx)
1145 struct net_device *dev = rx->dev;
1146 struct ieee80211_local *local = rx->local;
1147 struct sk_buff *skb, *xmit_skb;
1148 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1153 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1154 || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1155 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
1156 if (is_multicast_ether_addr(skb->data)) {
1157 /* send multicast frames both to higher layers in
1158 * local net stack and back to the wireless media */
1159 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1160 if (!xmit_skb && net_ratelimit())
1161 printk(KERN_DEBUG "%s: failed to clone "
1162 "multicast frame\n", dev->name);
1164 struct sta_info *dsta;
1165 dsta = sta_info_get(local, skb->data);
1166 if (dsta && !dsta->dev) {
1167 if (net_ratelimit())
1168 printk(KERN_DEBUG "Station with null "
1169 "dev structure!\n");
1170 } else if (dsta && dsta->dev == dev) {
1171 /* Destination station is associated to this
1172 * AP, so send the frame directly to it and
1173 * do not pass the frame to local net stack.
1184 /* deliver to local stack */
1185 skb->protocol = eth_type_trans(skb, dev);
1186 memset(skb->cb, 0, sizeof(skb->cb));
1191 /* send to wireless media */
1192 xmit_skb->protocol = __constant_htons(ETH_P_802_3);
1193 skb_set_network_header(xmit_skb, 0);
1194 skb_set_mac_header(xmit_skb, 0);
1195 dev_queue_xmit(xmit_skb);
1199 static ieee80211_txrx_result
1200 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
1202 struct net_device *dev = rx->dev;
1207 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1208 return TXRX_CONTINUE;
1210 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1213 hdrlen = ieee80211_get_hdrlen(fc);
1215 if ((ieee80211_drop_802_1x_pae(rx, hdrlen)) ||
1216 (ieee80211_drop_unencrypted(rx, hdrlen)))
1219 err = ieee80211_data_to_8023(rx);
1225 dev->stats.rx_packets++;
1226 dev->stats.rx_bytes += rx->skb->len;
1228 ieee80211_deliver_skb(rx);
1233 static ieee80211_txrx_result
1234 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1236 struct ieee80211_sub_if_data *sdata;
1238 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
1241 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1242 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1243 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1244 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1245 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1252 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1253 struct ieee80211_local *local,
1254 ieee80211_rx_handler *handlers,
1255 struct ieee80211_txrx_data *rx,
1256 struct sta_info *sta)
1258 ieee80211_rx_handler *handler;
1259 ieee80211_txrx_result res = TXRX_DROP;
1261 for (handler = handlers; *handler != NULL; handler++) {
1262 res = (*handler)(rx);
1268 I802_DEBUG_INC(local->rx_handlers_drop);
1273 I802_DEBUG_INC(local->rx_handlers_queued);
1279 if (res == TXRX_DROP)
1280 dev_kfree_skb(rx->skb);
1284 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1285 ieee80211_rx_handler *handlers,
1286 struct ieee80211_txrx_data *rx,
1287 struct sta_info *sta)
1289 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1291 dev_kfree_skb(rx->skb);
1294 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1295 struct ieee80211_hdr *hdr,
1296 struct sta_info *sta,
1297 struct ieee80211_txrx_data *rx)
1300 DECLARE_MAC_BUF(mac);
1301 DECLARE_MAC_BUF(mac2);
1303 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1304 if (rx->skb->len >= hdrlen + 4)
1305 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1309 if (net_ratelimit())
1310 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1311 "failure from %s to %s keyidx=%d\n",
1312 dev->name, print_mac(mac, hdr->addr2),
1313 print_mac(mac2, hdr->addr1), keyidx);
1317 * Some hardware seem to generate incorrect Michael MIC
1318 * reports; ignore them to avoid triggering countermeasures.
1320 if (net_ratelimit())
1321 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1322 "error for unknown address %s\n",
1323 dev->name, print_mac(mac, hdr->addr2));
1327 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1328 if (net_ratelimit())
1329 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1330 "error for a frame with no PROTECTED flag (src "
1331 "%s)\n", dev->name, print_mac(mac, hdr->addr2));
1335 if (rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
1337 * APs with pairwise keys should never receive Michael MIC
1338 * errors for non-zero keyidx because these are reserved for
1339 * group keys and only the AP is sending real multicast
1340 * frames in the BSS.
1342 if (net_ratelimit())
1343 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1344 "a frame with non-zero keyidx (%d)"
1345 " (src %s)\n", dev->name, keyidx,
1346 print_mac(mac, hdr->addr2));
1350 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1351 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1352 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1353 if (net_ratelimit())
1354 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1355 "error for a frame that cannot be encrypted "
1356 "(fc=0x%04x) (src %s)\n",
1357 dev->name, rx->fc, print_mac(mac, hdr->addr2));
1361 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1363 dev_kfree_skb(rx->skb);
1367 ieee80211_rx_handler ieee80211_rx_handlers[] =
1369 ieee80211_rx_h_if_stats,
1370 ieee80211_rx_h_passive_scan,
1371 ieee80211_rx_h_check,
1372 ieee80211_rx_h_decrypt,
1373 ieee80211_rx_h_sta_process,
1374 ieee80211_rx_h_defragment,
1375 ieee80211_rx_h_ps_poll,
1376 ieee80211_rx_h_michael_mic_verify,
1377 /* this must be after decryption - so header is counted in MPDU mic
1378 * must be before pae and data, so QOS_DATA format frames
1379 * are not passed to user space by these functions
1381 ieee80211_rx_h_remove_qos_control,
1382 ieee80211_rx_h_data,
1383 ieee80211_rx_h_mgmt,
1387 /* main receive path */
1389 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1390 u8 *bssid, struct ieee80211_txrx_data *rx,
1391 struct ieee80211_hdr *hdr)
1393 int multicast = is_multicast_ether_addr(hdr->addr1);
1395 switch (sdata->type) {
1396 case IEEE80211_IF_TYPE_STA:
1399 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1400 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1402 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1403 } else if (!multicast &&
1404 compare_ether_addr(sdata->dev->dev_addr,
1406 if (!(sdata->dev->flags & IFF_PROMISC))
1408 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1411 case IEEE80211_IF_TYPE_IBSS:
1414 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1415 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1417 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1418 } else if (!multicast &&
1419 compare_ether_addr(sdata->dev->dev_addr,
1421 if (!(sdata->dev->flags & IFF_PROMISC))
1423 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1424 } else if (!rx->sta)
1425 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1428 case IEEE80211_IF_TYPE_VLAN:
1429 case IEEE80211_IF_TYPE_AP:
1431 if (compare_ether_addr(sdata->dev->dev_addr,
1434 } else if (!ieee80211_bssid_match(bssid,
1435 sdata->dev->dev_addr)) {
1436 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1438 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1440 if (sdata->dev == sdata->local->mdev &&
1441 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1442 /* do not receive anything via
1443 * master device when not scanning */
1446 case IEEE80211_IF_TYPE_WDS:
1448 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1450 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1453 case IEEE80211_IF_TYPE_MNTR:
1454 /* take everything */
1456 case IEEE80211_IF_TYPE_INVALID:
1457 /* should never get here */
1466 * This is the receive path handler. It is called by a low level driver when an
1467 * 802.11 MPDU is received from the hardware.
1469 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1470 struct ieee80211_rx_status *status)
1472 struct ieee80211_local *local = hw_to_local(hw);
1473 struct ieee80211_sub_if_data *sdata;
1474 struct sta_info *sta;
1475 struct ieee80211_hdr *hdr;
1476 struct ieee80211_txrx_data rx;
1479 struct ieee80211_sub_if_data *prev = NULL;
1480 struct sk_buff *skb_new;
1485 * key references and virtual interfaces are protected using RCU
1486 * and this requires that we are in a read-side RCU section during
1487 * receive processing
1492 * Frames with failed FCS/PLCP checksum are not returned,
1493 * all other frames are returned without radiotap header
1494 * if it was previously present.
1495 * Also, frames with less than 16 bytes are dropped.
1497 skb = ieee80211_rx_monitor(local, skb, status);
1503 hdr = (struct ieee80211_hdr *) skb->data;
1504 memset(&rx, 0, sizeof(rx));
1508 rx.u.rx.status = status;
1509 rx.fc = le16_to_cpu(hdr->frame_control);
1510 type = rx.fc & IEEE80211_FCTL_FTYPE;
1513 * Drivers are required to align the payload data to a four-byte
1514 * boundary, so the last two bits of the address where it starts
1515 * may not be set. The header is required to be directly before
1516 * the payload data, padding like atheros hardware adds which is
1517 * inbetween the 802.11 header and the payload is not supported,
1518 * the driver is required to move the 802.11 header further back
1521 hdrlen = ieee80211_get_hdrlen(rx.fc);
1522 WARN_ON_ONCE(((unsigned long)(skb->data + hdrlen)) & 3);
1524 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1525 local->dot11ReceivedFragmentCount++;
1527 sta = rx.sta = sta_info_get(local, hdr->addr2);
1529 rx.dev = rx.sta->dev;
1530 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1533 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1534 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1538 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1539 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1541 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1542 sta) != TXRX_CONTINUE)
1546 if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
1547 !atomic_read(&local->iff_promiscs) &&
1548 !is_multicast_ether_addr(hdr->addr1)) {
1549 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1550 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1557 bssid = ieee80211_get_bssid(hdr, skb->len);
1559 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1560 if (!netif_running(sdata->dev))
1563 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
1566 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1567 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1568 /* prepare_for_handlers can change sta */
1575 * frame is destined for this interface, but if it's not
1576 * also for the previous one we handle that after the
1577 * loop to avoid copying the SKB once too much
1586 * frame was destined for the previous interface
1587 * so invoke RX handlers for it
1590 skb_new = skb_copy(skb, GFP_ATOMIC);
1592 if (net_ratelimit())
1593 printk(KERN_DEBUG "%s: failed to copy "
1594 "multicast frame for %s",
1595 wiphy_name(local->hw.wiphy),
1602 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1610 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1621 EXPORT_SYMBOL(__ieee80211_rx);
1623 /* This is a version of the rx handler that can be called from hard irq
1624 * context. Post the skb on the queue and schedule the tasklet */
1625 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1626 struct ieee80211_rx_status *status)
1628 struct ieee80211_local *local = hw_to_local(hw);
1630 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1632 skb->dev = local->mdev;
1633 /* copy status into skb->cb for use by tasklet */
1634 memcpy(skb->cb, status, sizeof(*status));
1635 skb->pkt_type = IEEE80211_RX_MSG;
1636 skb_queue_tail(&local->skb_queue, skb);
1637 tasklet_schedule(&local->tasklet);
1639 EXPORT_SYMBOL(ieee80211_rx_irqsafe);