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"
27 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
28 struct tid_ampdu_rx *tid_agg_rx,
29 struct sk_buff *skb, u16 mpdu_seq_num,
32 * monitor mode reception
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
37 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
41 skb_pull(skb, rtap_len);
43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
45 skb_trim(skb, skb->len - FCS_LEN);
57 static inline int should_drop_frame(struct ieee80211_rx_status *status,
62 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
64 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
66 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
68 if (((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
69 cpu_to_le16(IEEE80211_FTYPE_CTL)) &&
70 ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) !=
71 cpu_to_le16(IEEE80211_STYPE_PSPOLL)) &&
72 ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) !=
73 cpu_to_le16(IEEE80211_STYPE_BACK_REQ)))
79 * This function copies a received frame to all monitor interfaces and
80 * returns a cleaned-up SKB that no longer includes the FCS nor the
81 * radiotap header the driver might have added.
83 static struct sk_buff *
84 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
85 struct ieee80211_rx_status *status,
86 struct ieee80211_rate *rate)
88 struct ieee80211_sub_if_data *sdata;
89 int needed_headroom = 0;
90 struct ieee80211_radiotap_header *rthdr;
91 __le64 *rttsft = NULL;
92 struct ieee80211_rtap_fixed_data {
98 u8 padding_for_rxflags;
100 } __attribute__ ((packed)) *rtfixed;
101 struct sk_buff *skb, *skb2;
102 struct net_device *prev_dev = NULL;
103 int present_fcs_len = 0;
107 * First, we may need to make a copy of the skb because
108 * (1) we need to modify it for radiotap (if not present), and
109 * (2) the other RX handlers will modify the skb we got.
111 * We don't need to, of course, if we aren't going to return
112 * the SKB because it has a bad FCS/PLCP checksum.
114 if (status->flag & RX_FLAG_RADIOTAP)
115 rtap_len = ieee80211_get_radiotap_len(origskb->data);
117 /* room for radiotap header, always present fields and TSFT */
118 needed_headroom = sizeof(*rthdr) + sizeof(*rtfixed) + 8;
120 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
121 present_fcs_len = FCS_LEN;
123 if (!local->monitors) {
124 if (should_drop_frame(status, origskb, present_fcs_len,
126 dev_kfree_skb(origskb);
130 return remove_monitor_info(local, origskb, rtap_len);
133 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
134 /* only need to expand headroom if necessary */
139 * This shouldn't trigger often because most devices have an
140 * RX header they pull before we get here, and that should
141 * be big enough for our radiotap information. We should
142 * probably export the length to drivers so that we can have
143 * them allocate enough headroom to start with.
145 if (skb_headroom(skb) < needed_headroom &&
146 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
152 * Need to make a copy and possibly remove radiotap header
153 * and FCS from the original.
155 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
157 origskb = remove_monitor_info(local, origskb, rtap_len);
163 /* if necessary, prepend radiotap information */
164 if (!(status->flag & RX_FLAG_RADIOTAP)) {
165 rtfixed = (void *) skb_push(skb, sizeof(*rtfixed));
166 rtap_len = sizeof(*rthdr) + sizeof(*rtfixed);
167 if (status->flag & RX_FLAG_TSFT) {
168 rttsft = (void *) skb_push(skb, sizeof(*rttsft));
171 rthdr = (void *) skb_push(skb, sizeof(*rthdr));
172 memset(rthdr, 0, sizeof(*rthdr));
173 memset(rtfixed, 0, sizeof(*rtfixed));
175 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
176 (1 << IEEE80211_RADIOTAP_RATE) |
177 (1 << IEEE80211_RADIOTAP_CHANNEL) |
178 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL) |
179 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
181 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
182 rtfixed->flags |= IEEE80211_RADIOTAP_F_FCS;
185 *rttsft = cpu_to_le64(status->mactime);
187 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
190 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
191 rtfixed->rx_flags = 0;
193 (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
195 cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
197 rtfixed->rate = rate->bitrate / 5;
199 rtfixed->chan_freq = cpu_to_le16(status->freq);
201 if (status->band == IEEE80211_BAND_5GHZ)
202 rtfixed->chan_flags =
203 cpu_to_le16(IEEE80211_CHAN_OFDM |
204 IEEE80211_CHAN_5GHZ);
206 rtfixed->chan_flags =
207 cpu_to_le16(IEEE80211_CHAN_DYN |
208 IEEE80211_CHAN_2GHZ);
210 rtfixed->antsignal = status->ssi;
211 rthdr->it_len = cpu_to_le16(rtap_len);
214 skb_reset_mac_header(skb);
215 skb->ip_summed = CHECKSUM_UNNECESSARY;
216 skb->pkt_type = PACKET_OTHERHOST;
217 skb->protocol = htons(ETH_P_802_2);
219 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
220 if (!netif_running(sdata->dev))
223 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
227 skb2 = skb_clone(skb, GFP_ATOMIC);
229 skb2->dev = prev_dev;
234 prev_dev = sdata->dev;
235 sdata->dev->stats.rx_packets++;
236 sdata->dev->stats.rx_bytes += skb->len;
249 static void ieee80211_parse_qos(struct ieee80211_txrx_data *rx)
251 u8 *data = rx->skb->data;
254 /* does the frame have a qos control field? */
255 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
256 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
257 /* frame has qos control */
258 tid = qc[0] & QOS_CONTROL_TID_MASK;
259 if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
260 rx->flags |= IEEE80211_TXRXD_RX_AMSDU;
262 rx->flags &= ~IEEE80211_TXRXD_RX_AMSDU;
264 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
265 /* Separate TID for management frames */
266 tid = NUM_RX_DATA_QUEUES - 1;
268 /* no qos control present */
269 tid = 0; /* 802.1d - Best Effort */
273 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
274 /* only a debug counter, sta might not be assigned properly yet */
276 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
278 rx->u.rx.queue = tid;
279 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
280 * For now, set skb->priority to 0 for other cases. */
281 rx->skb->priority = (tid > 7) ? 0 : tid;
284 static void ieee80211_verify_ip_alignment(struct ieee80211_txrx_data *rx)
286 #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
289 if (!WLAN_FC_DATA_PRESENT(rx->fc))
293 * Drivers are required to align the payload data in a way that
294 * guarantees that the contained IP header is aligned to a four-
295 * byte boundary. In the case of regular frames, this simply means
296 * aligning the payload to a four-byte boundary (because either
297 * the IP header is directly contained, or IV/RFC1042 headers that
298 * have a length divisible by four are in front of it.
300 * With A-MSDU frames, however, the payload data address must
301 * yield two modulo four because there are 14-byte 802.3 headers
302 * within the A-MSDU frames that push the IP header further back
303 * to a multiple of four again. Thankfully, the specs were sane
304 * enough this time around to require padding each A-MSDU subframe
305 * to a length that is a multiple of four.
307 * Padding like atheros hardware adds which is inbetween the 802.11
308 * header and the payload is not supported, the driver is required
309 * to move the 802.11 header further back in that case.
311 hdrlen = ieee80211_get_hdrlen(rx->fc);
312 if (rx->flags & IEEE80211_TXRXD_RX_AMSDU)
314 WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
319 static u32 ieee80211_rx_load_stats(struct ieee80211_local *local,
321 struct ieee80211_rx_status *status,
322 struct ieee80211_rate *rate)
324 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
325 u32 load = 0, hdrtime;
327 /* Estimate total channel use caused by this frame */
329 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
330 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
332 if (status->band == IEEE80211_BAND_5GHZ ||
333 (status->band == IEEE80211_BAND_5GHZ &&
334 rate->flags & IEEE80211_RATE_ERP_G))
335 hdrtime = CHAN_UTIL_HDR_SHORT;
337 hdrtime = CHAN_UTIL_HDR_LONG;
340 if (!is_multicast_ether_addr(hdr->addr1))
343 /* TODO: optimise again */
344 load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate;
346 /* Divide channel_use by 8 to avoid wrapping around the counter */
347 load >>= CHAN_UTIL_SHIFT;
354 static ieee80211_rx_result
355 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
358 rx->sta->channel_use_raw += rx->u.rx.load;
359 rx->sdata->channel_use_raw += rx->u.rx.load;
363 static ieee80211_rx_result
364 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
366 struct ieee80211_local *local = rx->local;
367 struct sk_buff *skb = rx->skb;
369 if (unlikely(local->sta_hw_scanning))
370 return ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
372 if (unlikely(local->sta_sw_scanning)) {
373 /* drop all the other packets during a software scan anyway */
374 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status)
380 if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
381 /* scanning finished during invoking of handlers */
382 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
383 return RX_DROP_UNUSABLE;
389 static ieee80211_rx_result
390 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
392 struct ieee80211_hdr *hdr;
393 hdr = (struct ieee80211_hdr *) rx->skb->data;
395 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
396 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
397 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
398 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
400 if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
401 rx->local->dot11FrameDuplicateCount++;
402 rx->sta->num_duplicates++;
404 return RX_DROP_MONITOR;
406 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
409 if (unlikely(rx->skb->len < 16)) {
410 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
411 return RX_DROP_MONITOR;
414 /* Drop disallowed frame classes based on STA auth/assoc state;
415 * IEEE 802.11, Chap 5.5.
417 * 80211.o does filtering only based on association state, i.e., it
418 * drops Class 3 frames from not associated stations. hostapd sends
419 * deauth/disassoc frames when needed. In addition, hostapd is
420 * responsible for filtering on both auth and assoc states.
422 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
423 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
424 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
425 rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
426 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
427 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
428 !(rx->fc & IEEE80211_FCTL_TODS) &&
429 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
430 || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
431 /* Drop IBSS frames and frames for other hosts
433 return RX_DROP_MONITOR;
436 return RX_DROP_MONITOR;
443 static ieee80211_rx_result
444 ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
446 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
449 ieee80211_rx_result result = RX_DROP_UNUSABLE;
450 struct ieee80211_key *stakey = NULL;
455 * There are three types of keys:
457 * - PTK (pairwise keys)
458 * - STK (station-to-station pairwise keys)
460 * When selecting a key, we have to distinguish between multicast
461 * (including broadcast) and unicast frames, the latter can only
462 * use PTKs and STKs while the former always use GTKs. Unless, of
463 * course, actual WEP keys ("pre-RSNA") are used, then unicast
464 * frames can also use key indizes like GTKs. Hence, if we don't
465 * have a PTK/STK we check the key index for a WEP key.
467 * Note that in a regular BSS, multicast frames are sent by the
468 * AP only, associated stations unicast the frame to the AP first
469 * which then multicasts it on their behalf.
471 * There is also a slight problem in IBSS mode: GTKs are negotiated
472 * with each station, that is something we don't currently handle.
473 * The spec seems to expect that one negotiates the same key with
474 * every station but there's no such requirement; VLANs could be
478 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
482 * No point in finding a key and decrypting if the frame is neither
483 * addressed to us nor a multicast frame.
485 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
489 stakey = rcu_dereference(rx->sta->key);
491 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
495 * The device doesn't give us the IV so we won't be
496 * able to look up the key. That's ok though, we
497 * don't need to decrypt the frame, we just won't
498 * be able to keep statistics accurate.
499 * Except for key threshold notifications, should
500 * we somehow allow the driver to tell us which key
501 * the hardware used if this flag is set?
503 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
504 (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
507 hdrlen = ieee80211_get_hdrlen(rx->fc);
509 if (rx->skb->len < 8 + hdrlen)
510 return RX_DROP_UNUSABLE; /* TODO: count this? */
513 * no need to call ieee80211_wep_get_keyidx,
514 * it verifies a bunch of things we've done already
516 keyidx = rx->skb->data[hdrlen + 3] >> 6;
518 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
521 * RSNA-protected unicast frames should always be sent with
522 * pairwise or station-to-station keys, but for WEP we allow
523 * using a key index as well.
525 if (rx->key && rx->key->conf.alg != ALG_WEP &&
526 !is_multicast_ether_addr(hdr->addr1))
531 rx->key->tx_rx_count++;
532 /* TODO: add threshold stuff again */
534 #ifdef CONFIG_MAC80211_DEBUG
536 printk(KERN_DEBUG "%s: RX protected frame,"
537 " but have no key\n", rx->dev->name);
538 #endif /* CONFIG_MAC80211_DEBUG */
539 return RX_DROP_MONITOR;
542 /* Check for weak IVs if possible */
543 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
544 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
545 (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
546 !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
547 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
548 rx->sta->wep_weak_iv_count++;
550 switch (rx->key->conf.alg) {
552 result = ieee80211_crypto_wep_decrypt(rx);
555 result = ieee80211_crypto_tkip_decrypt(rx);
558 result = ieee80211_crypto_ccmp_decrypt(rx);
562 /* either the frame has been decrypted or will be dropped */
563 rx->u.rx.status->flag |= RX_FLAG_DECRYPTED;
568 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
570 struct ieee80211_sub_if_data *sdata;
571 DECLARE_MAC_BUF(mac);
573 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
576 atomic_inc(&sdata->bss->num_sta_ps);
577 sta->flags |= WLAN_STA_PS;
579 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
580 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
581 dev->name, print_mac(mac, sta->addr), sta->aid);
582 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
585 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
587 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
590 struct ieee80211_sub_if_data *sdata;
591 struct ieee80211_tx_packet_data *pkt_data;
592 DECLARE_MAC_BUF(mac);
594 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
596 atomic_dec(&sdata->bss->num_sta_ps);
597 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
599 if (!skb_queue_empty(&sta->ps_tx_buf)) {
600 if (local->ops->set_tim)
601 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
603 bss_tim_clear(local, sdata->bss, sta->aid);
605 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
606 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
607 dev->name, print_mac(mac, sta->addr), sta->aid);
608 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
609 /* Send all buffered frames to the station */
610 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
611 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
613 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
616 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
617 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
618 local->total_ps_buffered--;
620 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
621 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
622 "since STA not sleeping anymore\n", dev->name,
623 print_mac(mac, sta->addr), sta->aid);
624 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
625 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
632 static ieee80211_rx_result
633 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
635 struct sta_info *sta = rx->sta;
636 struct net_device *dev = rx->dev;
637 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
642 /* Update last_rx only for IBSS packets which are for the current
643 * BSSID to avoid keeping the current IBSS network alive in cases where
644 * other STAs are using different BSSID. */
645 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
646 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
647 IEEE80211_IF_TYPE_IBSS);
648 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
649 sta->last_rx = jiffies;
651 if (!is_multicast_ether_addr(hdr->addr1) ||
652 rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
653 /* Update last_rx only for unicast frames in order to prevent
654 * the Probe Request frames (the only broadcast frames from a
655 * STA in infrastructure mode) from keeping a connection alive.
657 sta->last_rx = jiffies;
660 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
664 sta->rx_bytes += rx->skb->len;
665 sta->last_rssi = rx->u.rx.status->ssi;
666 sta->last_signal = rx->u.rx.status->signal;
667 sta->last_noise = rx->u.rx.status->noise;
669 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
670 /* Change STA power saving mode only in the end of a frame
671 * exchange sequence */
672 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
673 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
674 else if (!(sta->flags & WLAN_STA_PS) &&
675 (rx->fc & IEEE80211_FCTL_PM))
676 ap_sta_ps_start(dev, sta);
679 /* Drop data::nullfunc frames silently, since they are used only to
680 * control station power saving mode. */
681 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
682 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
683 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
684 /* Update counter and free packet here to avoid counting this
685 * as a dropped packed. */
687 dev_kfree_skb(rx->skb);
692 } /* ieee80211_rx_h_sta_process */
694 static inline struct ieee80211_fragment_entry *
695 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
696 unsigned int frag, unsigned int seq, int rx_queue,
697 struct sk_buff **skb)
699 struct ieee80211_fragment_entry *entry;
702 idx = sdata->fragment_next;
703 entry = &sdata->fragments[sdata->fragment_next++];
704 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
705 sdata->fragment_next = 0;
707 if (!skb_queue_empty(&entry->skb_list)) {
708 #ifdef CONFIG_MAC80211_DEBUG
709 struct ieee80211_hdr *hdr =
710 (struct ieee80211_hdr *) entry->skb_list.next->data;
711 DECLARE_MAC_BUF(mac);
712 DECLARE_MAC_BUF(mac2);
713 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
714 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
715 "addr1=%s addr2=%s\n",
716 sdata->dev->name, idx,
717 jiffies - entry->first_frag_time, entry->seq,
718 entry->last_frag, print_mac(mac, hdr->addr1),
719 print_mac(mac2, hdr->addr2));
720 #endif /* CONFIG_MAC80211_DEBUG */
721 __skb_queue_purge(&entry->skb_list);
724 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
726 entry->first_frag_time = jiffies;
728 entry->rx_queue = rx_queue;
729 entry->last_frag = frag;
731 entry->extra_len = 0;
736 static inline struct ieee80211_fragment_entry *
737 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
738 u16 fc, unsigned int frag, unsigned int seq,
739 int rx_queue, struct ieee80211_hdr *hdr)
741 struct ieee80211_fragment_entry *entry;
744 idx = sdata->fragment_next;
745 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
746 struct ieee80211_hdr *f_hdr;
751 idx = IEEE80211_FRAGMENT_MAX - 1;
753 entry = &sdata->fragments[idx];
754 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
755 entry->rx_queue != rx_queue ||
756 entry->last_frag + 1 != frag)
759 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
760 f_fc = le16_to_cpu(f_hdr->frame_control);
762 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
763 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
764 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
767 if (entry->first_frag_time + 2 * HZ < jiffies) {
768 __skb_queue_purge(&entry->skb_list);
777 static ieee80211_rx_result
778 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
780 struct ieee80211_hdr *hdr;
782 unsigned int frag, seq;
783 struct ieee80211_fragment_entry *entry;
785 DECLARE_MAC_BUF(mac);
787 hdr = (struct ieee80211_hdr *) rx->skb->data;
788 sc = le16_to_cpu(hdr->seq_ctrl);
789 frag = sc & IEEE80211_SCTL_FRAG;
791 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
792 (rx->skb)->len < 24 ||
793 is_multicast_ether_addr(hdr->addr1))) {
797 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
799 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
802 /* This is the first fragment of a new frame. */
803 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
804 rx->u.rx.queue, &(rx->skb));
805 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
806 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
807 /* Store CCMP PN so that we can verify that the next
808 * fragment has a sequential PN value. */
810 memcpy(entry->last_pn,
811 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
817 /* This is a fragment for a frame that should already be pending in
818 * fragment cache. Add this fragment to the end of the pending entry.
820 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
821 rx->u.rx.queue, hdr);
823 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
824 return RX_DROP_MONITOR;
827 /* Verify that MPDUs within one MSDU have sequential PN values.
828 * (IEEE 802.11i, 8.3.3.4.5) */
831 u8 pn[CCMP_PN_LEN], *rpn;
832 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
833 return RX_DROP_UNUSABLE;
834 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
835 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
840 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
841 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
843 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
845 " PN=%02x%02x%02x%02x%02x%02x "
846 "(expected %02x%02x%02x%02x%02x%02x)\n",
847 rx->dev->name, print_mac(mac, hdr->addr2),
848 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
849 rpn[5], pn[0], pn[1], pn[2], pn[3],
851 return RX_DROP_UNUSABLE;
853 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
856 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
857 __skb_queue_tail(&entry->skb_list, rx->skb);
858 entry->last_frag = frag;
859 entry->extra_len += rx->skb->len;
860 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
865 rx->skb = __skb_dequeue(&entry->skb_list);
866 if (skb_tailroom(rx->skb) < entry->extra_len) {
867 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
868 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
870 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
871 __skb_queue_purge(&entry->skb_list);
872 return RX_DROP_UNUSABLE;
875 while ((skb = __skb_dequeue(&entry->skb_list))) {
876 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
880 /* Complete frame has been reassembled - process it now */
881 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
885 rx->sta->rx_packets++;
886 if (is_multicast_ether_addr(hdr->addr1))
887 rx->local->dot11MulticastReceivedFrameCount++;
889 ieee80211_led_rx(rx->local);
893 static ieee80211_rx_result
894 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
896 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
899 DECLARE_MAC_BUF(mac);
901 if (likely(!rx->sta ||
902 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
903 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
904 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
907 if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
908 (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
909 return RX_DROP_UNUSABLE;
911 skb = skb_dequeue(&rx->sta->tx_filtered);
913 skb = skb_dequeue(&rx->sta->ps_tx_buf);
915 rx->local->total_ps_buffered--;
917 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
918 skb_queue_empty(&rx->sta->ps_tx_buf);
921 struct ieee80211_hdr *hdr =
922 (struct ieee80211_hdr *) skb->data;
924 /* tell TX path to send one frame even though the STA may
925 * still remain is PS mode after this frame exchange */
928 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
929 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
930 print_mac(mac, rx->sta->addr), rx->sta->aid,
931 skb_queue_len(&rx->sta->ps_tx_buf));
932 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
934 /* Use MoreData flag to indicate whether there are more
935 * buffered frames for this STA */
936 if (no_pending_pkts) {
937 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
938 rx->sta->flags &= ~WLAN_STA_TIM;
940 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
944 if (no_pending_pkts) {
945 if (rx->local->ops->set_tim)
946 rx->local->ops->set_tim(local_to_hw(rx->local),
949 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
951 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
952 } else if (!rx->u.rx.sent_ps_buffered) {
953 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
954 "though there is no buffered frames for it\n",
955 rx->dev->name, print_mac(mac, rx->sta->addr));
956 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
960 /* Free PS Poll skb here instead of returning RX_DROP that would
961 * count as an dropped frame. */
962 dev_kfree_skb(rx->skb);
967 static ieee80211_rx_result
968 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
971 u8 *data = rx->skb->data;
972 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
974 if (!WLAN_FC_IS_QOS_DATA(fc))
977 /* remove the qos control field, update frame type and meta-data */
978 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
979 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
980 /* change frame type to non QOS */
981 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
982 hdr->frame_control = cpu_to_le16(fc);
988 ieee80211_802_1x_port_control(struct ieee80211_txrx_data *rx)
990 if (unlikely(!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED))) {
991 #ifdef CONFIG_MAC80211_DEBUG
993 printk(KERN_DEBUG "%s: dropped frame "
994 "(unauthorized port)\n", rx->dev->name);
995 #endif /* CONFIG_MAC80211_DEBUG */
1003 ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx)
1006 * Pass through unencrypted frames if the hardware has
1007 * decrypted them already.
1009 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
1012 /* Drop unencrypted frames if key is set. */
1013 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1014 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1015 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1016 (rx->key || rx->sdata->drop_unencrypted))) {
1017 if (net_ratelimit())
1018 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
1019 "encryption\n", rx->dev->name);
1026 ieee80211_data_to_8023(struct ieee80211_txrx_data *rx)
1028 struct net_device *dev = rx->dev;
1029 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1030 u16 fc, hdrlen, ethertype;
1034 struct sk_buff *skb = rx->skb;
1035 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1036 DECLARE_MAC_BUF(mac);
1037 DECLARE_MAC_BUF(mac2);
1038 DECLARE_MAC_BUF(mac3);
1039 DECLARE_MAC_BUF(mac4);
1043 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1046 hdrlen = ieee80211_get_hdrlen(fc);
1048 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1050 * IEEE 802.11 address fields:
1051 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1052 * 0 0 DA SA BSSID n/a
1053 * 0 1 DA BSSID SA n/a
1054 * 1 0 BSSID SA DA n/a
1058 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1059 case IEEE80211_FCTL_TODS:
1061 memcpy(dst, hdr->addr3, ETH_ALEN);
1062 memcpy(src, hdr->addr2, ETH_ALEN);
1064 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
1065 sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) {
1066 if (net_ratelimit())
1067 printk(KERN_DEBUG "%s: dropped ToDS frame "
1068 "(BSSID=%s SA=%s DA=%s)\n",
1070 print_mac(mac, hdr->addr1),
1071 print_mac(mac2, hdr->addr2),
1072 print_mac(mac3, hdr->addr3));
1076 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1078 memcpy(dst, hdr->addr3, ETH_ALEN);
1079 memcpy(src, hdr->addr4, ETH_ALEN);
1081 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS)) {
1082 if (net_ratelimit())
1083 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
1084 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1086 print_mac(mac, hdr->addr1),
1087 print_mac(mac2, hdr->addr2),
1088 print_mac(mac3, hdr->addr3),
1089 print_mac(mac4, hdr->addr4));
1093 case IEEE80211_FCTL_FROMDS:
1095 memcpy(dst, hdr->addr1, ETH_ALEN);
1096 memcpy(src, hdr->addr3, ETH_ALEN);
1098 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
1099 (is_multicast_ether_addr(dst) &&
1100 !compare_ether_addr(src, dev->dev_addr)))
1105 memcpy(dst, hdr->addr1, ETH_ALEN);
1106 memcpy(src, hdr->addr2, ETH_ALEN);
1108 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
1109 if (net_ratelimit()) {
1110 printk(KERN_DEBUG "%s: dropped IBSS frame "
1111 "(DA=%s SA=%s BSSID=%s)\n",
1113 print_mac(mac, hdr->addr1),
1114 print_mac(mac2, hdr->addr2),
1115 print_mac(mac3, hdr->addr3));
1122 if (unlikely(skb->len - hdrlen < 8)) {
1123 if (net_ratelimit()) {
1124 printk(KERN_DEBUG "%s: RX too short data frame "
1125 "payload\n", dev->name);
1130 payload = skb->data + hdrlen;
1131 ethertype = (payload[6] << 8) | payload[7];
1133 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1134 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1135 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1136 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1137 * replace EtherType */
1138 skb_pull(skb, hdrlen + 6);
1139 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1140 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1142 struct ethhdr *ehdr;
1145 skb_pull(skb, hdrlen);
1146 len = htons(skb->len);
1147 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1148 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1149 memcpy(ehdr->h_source, src, ETH_ALEN);
1150 ehdr->h_proto = len;
1156 * requires that rx->skb is a frame with ethernet header
1158 static bool ieee80211_frame_allowed(struct ieee80211_txrx_data *rx)
1160 static const u8 pae_group_addr[ETH_ALEN]
1161 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1162 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1165 * Allow EAPOL frames to us/the PAE group address regardless
1166 * of whether the frame was encrypted or not.
1168 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1169 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1170 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1173 if (ieee80211_802_1x_port_control(rx) ||
1174 ieee80211_drop_unencrypted(rx))
1181 * requires that rx->skb is a frame with ethernet header
1184 ieee80211_deliver_skb(struct ieee80211_txrx_data *rx)
1186 struct net_device *dev = rx->dev;
1187 struct ieee80211_local *local = rx->local;
1188 struct sk_buff *skb, *xmit_skb;
1189 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1190 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1191 struct sta_info *dsta;
1196 if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1197 sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
1198 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
1199 if (is_multicast_ether_addr(ehdr->h_dest)) {
1201 * send multicast frames both to higher layers in
1202 * local net stack and back to the wireless medium
1204 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1205 if (!xmit_skb && net_ratelimit())
1206 printk(KERN_DEBUG "%s: failed to clone "
1207 "multicast frame\n", dev->name);
1209 dsta = sta_info_get(local, skb->data);
1210 if (dsta && dsta->dev == dev) {
1212 * The destination station is associated to
1213 * this AP (in this VLAN), so send the frame
1214 * directly to it and do not pass it to local
1226 /* deliver to local stack */
1227 skb->protocol = eth_type_trans(skb, dev);
1228 memset(skb->cb, 0, sizeof(skb->cb));
1233 /* send to wireless media */
1234 xmit_skb->protocol = htons(ETH_P_802_3);
1235 skb_reset_network_header(xmit_skb);
1236 skb_reset_mac_header(xmit_skb);
1237 dev_queue_xmit(xmit_skb);
1241 static ieee80211_rx_result
1242 ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
1244 struct net_device *dev = rx->dev;
1245 struct ieee80211_local *local = rx->local;
1248 struct sk_buff *skb = rx->skb, *frame = NULL;
1249 const struct ethhdr *eth;
1253 DECLARE_MAC_BUF(mac);
1256 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1259 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1260 return RX_DROP_MONITOR;
1262 if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU))
1265 err = ieee80211_data_to_8023(rx);
1267 return RX_DROP_UNUSABLE;
1271 dev->stats.rx_packets++;
1272 dev->stats.rx_bytes += skb->len;
1274 /* skip the wrapping header */
1275 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1277 return RX_DROP_UNUSABLE;
1279 while (skb != frame) {
1281 __be16 len = eth->h_proto;
1282 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1284 remaining = skb->len;
1285 memcpy(dst, eth->h_dest, ETH_ALEN);
1286 memcpy(src, eth->h_source, ETH_ALEN);
1288 padding = ((4 - subframe_len) & 0x3);
1289 /* the last MSDU has no padding */
1290 if (subframe_len > remaining) {
1291 printk(KERN_DEBUG "%s: wrong buffer size", dev->name);
1292 return RX_DROP_UNUSABLE;
1295 skb_pull(skb, sizeof(struct ethhdr));
1296 /* if last subframe reuse skb */
1297 if (remaining <= subframe_len + padding)
1300 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1304 return RX_DROP_UNUSABLE;
1306 skb_reserve(frame, local->hw.extra_tx_headroom +
1307 sizeof(struct ethhdr));
1308 memcpy(skb_put(frame, ntohs(len)), skb->data,
1311 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1314 printk(KERN_DEBUG "%s: wrong buffer size ",
1316 dev_kfree_skb(frame);
1317 return RX_DROP_UNUSABLE;
1321 skb_reset_network_header(frame);
1323 frame->priority = skb->priority;
1326 payload = frame->data;
1327 ethertype = (payload[6] << 8) | payload[7];
1329 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1330 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1331 compare_ether_addr(payload,
1332 bridge_tunnel_header) == 0)) {
1333 /* remove RFC1042 or Bridge-Tunnel
1334 * encapsulation and replace EtherType */
1336 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1337 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1339 memcpy(skb_push(frame, sizeof(__be16)),
1340 &len, sizeof(__be16));
1341 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1342 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1345 if (!ieee80211_frame_allowed(rx)) {
1346 if (skb == frame) /* last frame */
1347 return RX_DROP_UNUSABLE;
1348 dev_kfree_skb(frame);
1352 ieee80211_deliver_skb(rx);
1358 static ieee80211_rx_result
1359 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
1361 struct net_device *dev = rx->dev;
1366 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1369 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1370 return RX_DROP_MONITOR;
1372 err = ieee80211_data_to_8023(rx);
1374 return RX_DROP_UNUSABLE;
1376 if (!ieee80211_frame_allowed(rx))
1377 return RX_DROP_MONITOR;
1381 dev->stats.rx_packets++;
1382 dev->stats.rx_bytes += rx->skb->len;
1384 ieee80211_deliver_skb(rx);
1389 static ieee80211_rx_result
1390 ieee80211_rx_h_ctrl(struct ieee80211_txrx_data *rx)
1392 struct ieee80211_local *local = rx->local;
1393 struct ieee80211_hw *hw = &local->hw;
1394 struct sk_buff *skb = rx->skb;
1395 struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data;
1396 struct tid_ampdu_rx *tid_agg_rx;
1400 if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL))
1403 if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) {
1406 tid = le16_to_cpu(bar->control) >> 12;
1407 tid_agg_rx = &(rx->sta->ampdu_mlme.tid_rx[tid]);
1408 if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL)
1411 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1413 /* reset session timer */
1414 if (tid_agg_rx->timeout) {
1415 unsigned long expires =
1416 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1417 mod_timer(&tid_agg_rx->session_timer, expires);
1420 /* manage reordering buffer according to requested */
1421 /* sequence number */
1423 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1426 return RX_DROP_UNUSABLE;
1432 static ieee80211_rx_result
1433 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1435 struct ieee80211_sub_if_data *sdata;
1437 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
1438 return RX_DROP_MONITOR;
1440 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1441 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1442 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
1443 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1444 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1446 return RX_DROP_MONITOR;
1451 static inline ieee80211_rx_result __ieee80211_invoke_rx_handlers(
1452 struct ieee80211_local *local,
1453 ieee80211_rx_handler *handlers,
1454 struct ieee80211_txrx_data *rx,
1455 struct sta_info *sta)
1457 ieee80211_rx_handler *handler;
1458 ieee80211_rx_result res = RX_DROP_MONITOR;
1460 for (handler = handlers; *handler != NULL; handler++) {
1461 res = (*handler)(rx);
1466 case RX_DROP_UNUSABLE:
1467 case RX_DROP_MONITOR:
1468 I802_DEBUG_INC(local->rx_handlers_drop);
1473 I802_DEBUG_INC(local->rx_handlers_queued);
1479 if (res == RX_DROP_UNUSABLE || res == RX_DROP_MONITOR)
1480 dev_kfree_skb(rx->skb);
1484 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1485 ieee80211_rx_handler *handlers,
1486 struct ieee80211_txrx_data *rx,
1487 struct sta_info *sta)
1489 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1491 dev_kfree_skb(rx->skb);
1494 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1495 struct ieee80211_hdr *hdr,
1496 struct sta_info *sta,
1497 struct ieee80211_txrx_data *rx)
1500 DECLARE_MAC_BUF(mac);
1501 DECLARE_MAC_BUF(mac2);
1503 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1504 if (rx->skb->len >= hdrlen + 4)
1505 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1509 if (net_ratelimit())
1510 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1511 "failure from %s to %s keyidx=%d\n",
1512 dev->name, print_mac(mac, hdr->addr2),
1513 print_mac(mac2, hdr->addr1), keyidx);
1517 * Some hardware seem to generate incorrect Michael MIC
1518 * reports; ignore them to avoid triggering countermeasures.
1520 if (net_ratelimit())
1521 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1522 "error for unknown address %s\n",
1523 dev->name, print_mac(mac, hdr->addr2));
1527 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1528 if (net_ratelimit())
1529 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1530 "error for a frame with no PROTECTED flag (src "
1531 "%s)\n", dev->name, print_mac(mac, hdr->addr2));
1535 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
1537 * APs with pairwise keys should never receive Michael MIC
1538 * errors for non-zero keyidx because these are reserved for
1539 * group keys and only the AP is sending real multicast
1540 * frames in the BSS.
1542 if (net_ratelimit())
1543 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1544 "a frame with non-zero keyidx (%d)"
1545 " (src %s)\n", dev->name, keyidx,
1546 print_mac(mac, hdr->addr2));
1550 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1551 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1552 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1553 if (net_ratelimit())
1554 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1555 "error for a frame that cannot be encrypted "
1556 "(fc=0x%04x) (src %s)\n",
1557 dev->name, rx->fc, print_mac(mac, hdr->addr2));
1561 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1563 dev_kfree_skb(rx->skb);
1567 ieee80211_rx_handler ieee80211_rx_handlers[] =
1569 ieee80211_rx_h_if_stats,
1570 ieee80211_rx_h_passive_scan,
1571 ieee80211_rx_h_check,
1572 ieee80211_rx_h_decrypt,
1573 ieee80211_rx_h_sta_process,
1574 ieee80211_rx_h_defragment,
1575 ieee80211_rx_h_ps_poll,
1576 ieee80211_rx_h_michael_mic_verify,
1577 /* this must be after decryption - so header is counted in MPDU mic
1578 * must be before pae and data, so QOS_DATA format frames
1579 * are not passed to user space by these functions
1581 ieee80211_rx_h_remove_qos_control,
1582 ieee80211_rx_h_amsdu,
1583 ieee80211_rx_h_data,
1584 ieee80211_rx_h_ctrl,
1585 ieee80211_rx_h_mgmt,
1589 /* main receive path */
1591 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1592 u8 *bssid, struct ieee80211_txrx_data *rx,
1593 struct ieee80211_hdr *hdr)
1595 int multicast = is_multicast_ether_addr(hdr->addr1);
1597 switch (sdata->vif.type) {
1598 case IEEE80211_IF_TYPE_STA:
1601 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1602 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1604 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1605 } else if (!multicast &&
1606 compare_ether_addr(sdata->dev->dev_addr,
1608 if (!(sdata->dev->flags & IFF_PROMISC))
1610 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1613 case IEEE80211_IF_TYPE_IBSS:
1616 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1617 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1619 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1620 } else if (!multicast &&
1621 compare_ether_addr(sdata->dev->dev_addr,
1623 if (!(sdata->dev->flags & IFF_PROMISC))
1625 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1626 } else if (!rx->sta)
1627 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1630 case IEEE80211_IF_TYPE_VLAN:
1631 case IEEE80211_IF_TYPE_AP:
1633 if (compare_ether_addr(sdata->dev->dev_addr,
1636 } else if (!ieee80211_bssid_match(bssid,
1637 sdata->dev->dev_addr)) {
1638 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1640 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1642 if (sdata->dev == sdata->local->mdev &&
1643 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1644 /* do not receive anything via
1645 * master device when not scanning */
1648 case IEEE80211_IF_TYPE_WDS:
1650 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1652 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1655 case IEEE80211_IF_TYPE_MNTR:
1656 /* take everything */
1658 case IEEE80211_IF_TYPE_INVALID:
1659 /* should never get here */
1668 * This is the actual Rx frames handler. as it blongs to Rx path it must
1669 * be called with rcu_read_lock protection.
1671 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1672 struct sk_buff *skb,
1673 struct ieee80211_rx_status *status,
1675 struct ieee80211_rate *rate)
1677 struct ieee80211_local *local = hw_to_local(hw);
1678 struct ieee80211_sub_if_data *sdata;
1679 struct sta_info *sta;
1680 struct ieee80211_hdr *hdr;
1681 struct ieee80211_txrx_data rx;
1684 struct ieee80211_sub_if_data *prev = NULL;
1685 struct sk_buff *skb_new;
1688 hdr = (struct ieee80211_hdr *) skb->data;
1689 memset(&rx, 0, sizeof(rx));
1693 rx.u.rx.status = status;
1694 rx.u.rx.load = load;
1695 rx.u.rx.rate = rate;
1696 rx.fc = le16_to_cpu(hdr->frame_control);
1697 type = rx.fc & IEEE80211_FCTL_FTYPE;
1699 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1700 local->dot11ReceivedFragmentCount++;
1702 sta = rx.sta = sta_info_get(local, hdr->addr2);
1704 rx.dev = rx.sta->dev;
1705 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1708 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1709 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1713 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1714 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1716 ieee80211_parse_qos(&rx);
1717 ieee80211_verify_ip_alignment(&rx);
1721 if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
1722 !atomic_read(&local->iff_promiscs) &&
1723 !is_multicast_ether_addr(hdr->addr1)) {
1724 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1725 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1731 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1732 if (!netif_running(sdata->dev))
1735 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
1738 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1739 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1740 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1741 /* prepare_for_handlers can change sta */
1748 * frame is destined for this interface, but if it's not
1749 * also for the previous one we handle that after the
1750 * loop to avoid copying the SKB once too much
1759 * frame was destined for the previous interface
1760 * so invoke RX handlers for it
1763 skb_new = skb_copy(skb, GFP_ATOMIC);
1765 if (net_ratelimit())
1766 printk(KERN_DEBUG "%s: failed to copy "
1767 "multicast frame for %s",
1768 wiphy_name(local->hw.wiphy),
1772 rx.fc = le16_to_cpu(hdr->frame_control);
1776 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1781 rx.fc = le16_to_cpu(hdr->frame_control);
1785 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1795 #define SEQ_MODULO 0x1000
1796 #define SEQ_MASK 0xfff
1798 static inline int seq_less(u16 sq1, u16 sq2)
1800 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1803 static inline u16 seq_inc(u16 sq)
1805 return ((sq + 1) & SEQ_MASK);
1808 static inline u16 seq_sub(u16 sq1, u16 sq2)
1810 return ((sq1 - sq2) & SEQ_MASK);
1815 * As it function blongs to Rx path it must be called with
1816 * the proper rcu_read_lock protection for its flow.
1818 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
1819 struct tid_ampdu_rx *tid_agg_rx,
1820 struct sk_buff *skb, u16 mpdu_seq_num,
1823 struct ieee80211_local *local = hw_to_local(hw);
1824 struct ieee80211_rx_status status;
1825 u16 head_seq_num, buf_size;
1828 struct ieee80211_supported_band *sband;
1829 struct ieee80211_rate *rate;
1831 buf_size = tid_agg_rx->buf_size;
1832 head_seq_num = tid_agg_rx->head_seq_num;
1834 /* frame with out of date sequence number */
1835 if (seq_less(mpdu_seq_num, head_seq_num)) {
1840 /* if frame sequence number exceeds our buffering window size or
1841 * block Ack Request arrived - release stored frames */
1842 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
1843 /* new head to the ordering buffer */
1845 head_seq_num = mpdu_seq_num;
1848 seq_inc(seq_sub(mpdu_seq_num, buf_size));
1849 /* release stored frames up to new head to stack */
1850 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1851 index = seq_sub(tid_agg_rx->head_seq_num,
1853 % tid_agg_rx->buf_size;
1855 if (tid_agg_rx->reorder_buf[index]) {
1856 /* release the reordered frames to stack */
1858 tid_agg_rx->reorder_buf[index]->cb,
1860 sband = local->hw.wiphy->bands[status.band];
1861 rate = &sband->bitrates[status.rate_idx];
1862 pkt_load = ieee80211_rx_load_stats(local,
1863 tid_agg_rx->reorder_buf[index],
1865 __ieee80211_rx_handle_packet(hw,
1866 tid_agg_rx->reorder_buf[index],
1867 &status, pkt_load, rate);
1868 tid_agg_rx->stored_mpdu_num--;
1869 tid_agg_rx->reorder_buf[index] = NULL;
1871 tid_agg_rx->head_seq_num =
1872 seq_inc(tid_agg_rx->head_seq_num);
1878 /* now the new frame is always in the range of the reordering */
1880 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
1881 % tid_agg_rx->buf_size;
1882 /* check if we already stored this frame */
1883 if (tid_agg_rx->reorder_buf[index]) {
1888 /* if arrived mpdu is in the right order and nothing else stored */
1889 /* release it immediately */
1890 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1891 tid_agg_rx->stored_mpdu_num == 0) {
1892 tid_agg_rx->head_seq_num =
1893 seq_inc(tid_agg_rx->head_seq_num);
1897 /* put the frame in the reordering buffer */
1898 tid_agg_rx->reorder_buf[index] = skb;
1899 tid_agg_rx->stored_mpdu_num++;
1900 /* release the buffer until next missing frame */
1901 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
1902 % tid_agg_rx->buf_size;
1903 while (tid_agg_rx->reorder_buf[index]) {
1904 /* release the reordered frame back to stack */
1905 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
1907 sband = local->hw.wiphy->bands[status.band];
1908 rate = &sband->bitrates[status.rate_idx];
1909 pkt_load = ieee80211_rx_load_stats(local,
1910 tid_agg_rx->reorder_buf[index],
1912 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
1913 &status, pkt_load, rate);
1914 tid_agg_rx->stored_mpdu_num--;
1915 tid_agg_rx->reorder_buf[index] = NULL;
1916 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
1917 index = seq_sub(tid_agg_rx->head_seq_num,
1918 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
1923 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
1924 struct sk_buff *skb)
1926 struct ieee80211_hw *hw = &local->hw;
1927 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1928 struct sta_info *sta;
1929 struct tid_ampdu_rx *tid_agg_rx;
1935 sta = sta_info_get(local, hdr->addr2);
1939 fc = le16_to_cpu(hdr->frame_control);
1941 /* filter the QoS data rx stream according to
1942 * STA/TID and check if this STA/TID is on aggregation */
1943 if (!WLAN_FC_IS_QOS_DATA(fc))
1946 qc = skb->data + ieee80211_get_hdrlen(fc) - QOS_CONTROL_LEN;
1947 tid = qc[0] & QOS_CONTROL_TID_MASK;
1948 tid_agg_rx = &(sta->ampdu_mlme.tid_rx[tid]);
1950 if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL)
1953 /* null data frames are excluded */
1954 if (unlikely(fc & IEEE80211_STYPE_NULLFUNC))
1957 /* new un-ordered ampdu frame - process it */
1959 /* reset session timer */
1960 if (tid_agg_rx->timeout) {
1961 unsigned long expires =
1962 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1963 mod_timer(&tid_agg_rx->session_timer, expires);
1966 /* if this mpdu is fragmented - terminate rx aggregation session */
1967 sc = le16_to_cpu(hdr->seq_ctrl);
1968 if (sc & IEEE80211_SCTL_FRAG) {
1969 ieee80211_sta_stop_rx_ba_session(sta->dev, sta->addr,
1970 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
1975 /* according to mpdu sequence number deal with reordering buffer */
1976 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1977 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
1986 * This is the receive path handler. It is called by a low level driver when an
1987 * 802.11 MPDU is received from the hardware.
1989 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1990 struct ieee80211_rx_status *status)
1992 struct ieee80211_local *local = hw_to_local(hw);
1994 struct ieee80211_rate *rate = NULL;
1995 struct ieee80211_supported_band *sband;
1997 if (status->band < 0 ||
1998 status->band > IEEE80211_NUM_BANDS) {
2003 sband = local->hw.wiphy->bands[status->band];
2006 status->rate_idx < 0 ||
2007 status->rate_idx >= sband->n_bitrates) {
2012 rate = &sband->bitrates[status->rate_idx];
2015 * key references and virtual interfaces are protected using RCU
2016 * and this requires that we are in a read-side RCU section during
2017 * receive processing
2022 * Frames with failed FCS/PLCP checksum are not returned,
2023 * all other frames are returned without radiotap header
2024 * if it was previously present.
2025 * Also, frames with less than 16 bytes are dropped.
2027 skb = ieee80211_rx_monitor(local, skb, status, rate);
2033 pkt_load = ieee80211_rx_load_stats(local, skb, status, rate);
2034 local->channel_use_raw += pkt_load;
2036 if (!ieee80211_rx_reorder_ampdu(local, skb))
2037 __ieee80211_rx_handle_packet(hw, skb, status, pkt_load, rate);
2041 EXPORT_SYMBOL(__ieee80211_rx);
2043 /* This is a version of the rx handler that can be called from hard irq
2044 * context. Post the skb on the queue and schedule the tasklet */
2045 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2046 struct ieee80211_rx_status *status)
2048 struct ieee80211_local *local = hw_to_local(hw);
2050 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2052 skb->dev = local->mdev;
2053 /* copy status into skb->cb for use by tasklet */
2054 memcpy(skb->cb, status, sizeof(*status));
2055 skb->pkt_type = IEEE80211_RX_MSG;
2056 skb_queue_tail(&local->skb_queue, skb);
2057 tasklet_schedule(&local->tasklet);
2059 EXPORT_SYMBOL(ieee80211_rx_irqsafe);