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)
87 struct ieee80211_sub_if_data *sdata;
88 struct ieee80211_rate *rate;
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 rate = ieee80211_get_rate(local, status->phymode,
200 rtfixed->rate = rate->rate / 5;
202 rtfixed->chan_freq = cpu_to_le16(status->freq);
204 if (status->phymode == MODE_IEEE80211A)
205 rtfixed->chan_flags =
206 cpu_to_le16(IEEE80211_CHAN_OFDM |
207 IEEE80211_CHAN_5GHZ);
209 rtfixed->chan_flags =
210 cpu_to_le16(IEEE80211_CHAN_DYN |
211 IEEE80211_CHAN_2GHZ);
213 rtfixed->antsignal = status->ssi;
214 rthdr->it_len = cpu_to_le16(rtap_len);
217 skb_reset_mac_header(skb);
218 skb->ip_summed = CHECKSUM_UNNECESSARY;
219 skb->pkt_type = PACKET_OTHERHOST;
220 skb->protocol = htons(ETH_P_802_2);
222 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
223 if (!netif_running(sdata->dev))
226 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
230 skb2 = skb_clone(skb, GFP_ATOMIC);
232 skb2->dev = prev_dev;
237 prev_dev = sdata->dev;
238 sdata->dev->stats.rx_packets++;
239 sdata->dev->stats.rx_bytes += skb->len;
252 static void ieee80211_parse_qos(struct ieee80211_txrx_data *rx)
254 u8 *data = rx->skb->data;
257 /* does the frame have a qos control field? */
258 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
259 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
260 /* frame has qos control */
261 tid = qc[0] & QOS_CONTROL_TID_MASK;
262 if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
263 rx->flags |= IEEE80211_TXRXD_RX_AMSDU;
265 rx->flags &= ~IEEE80211_TXRXD_RX_AMSDU;
267 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
268 /* Separate TID for management frames */
269 tid = NUM_RX_DATA_QUEUES - 1;
271 /* no qos control present */
272 tid = 0; /* 802.1d - Best Effort */
276 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
277 /* only a debug counter, sta might not be assigned properly yet */
279 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
281 rx->u.rx.queue = tid;
282 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
283 * For now, set skb->priority to 0 for other cases. */
284 rx->skb->priority = (tid > 7) ? 0 : tid;
287 static void ieee80211_verify_ip_alignment(struct ieee80211_txrx_data *rx)
289 #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
292 if (!WLAN_FC_DATA_PRESENT(rx->fc))
296 * Drivers are required to align the payload data in a way that
297 * guarantees that the contained IP header is aligned to a four-
298 * byte boundary. In the case of regular frames, this simply means
299 * aligning the payload to a four-byte boundary (because either
300 * the IP header is directly contained, or IV/RFC1042 headers that
301 * have a length divisible by four are in front of it.
303 * With A-MSDU frames, however, the payload data address must
304 * yield two modulo four because there are 14-byte 802.3 headers
305 * within the A-MSDU frames that push the IP header further back
306 * to a multiple of four again. Thankfully, the specs were sane
307 * enough this time around to require padding each A-MSDU subframe
308 * to a length that is a multiple of four.
310 * Padding like atheros hardware adds which is inbetween the 802.11
311 * header and the payload is not supported, the driver is required
312 * to move the 802.11 header further back in that case.
314 hdrlen = ieee80211_get_hdrlen(rx->fc);
315 if (rx->flags & IEEE80211_TXRXD_RX_AMSDU)
317 WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
322 static u32 ieee80211_rx_load_stats(struct ieee80211_local *local,
324 struct ieee80211_rx_status *status)
326 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
327 u32 load = 0, hdrtime;
328 struct ieee80211_rate *rate;
329 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
332 /* Estimate total channel use caused by this frame */
334 if (unlikely(mode->num_rates < 0))
335 return TXRX_CONTINUE;
337 rate = &mode->rates[0];
338 for (i = 0; i < mode->num_rates; i++) {
339 if (mode->rates[i].val == status->rate) {
340 rate = &mode->rates[i];
345 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
346 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
348 if (mode->mode == MODE_IEEE80211A ||
349 (mode->mode == MODE_IEEE80211G &&
350 rate->flags & IEEE80211_RATE_ERP))
351 hdrtime = CHAN_UTIL_HDR_SHORT;
353 hdrtime = CHAN_UTIL_HDR_LONG;
356 if (!is_multicast_ether_addr(hdr->addr1))
359 load += skb->len * rate->rate_inv;
361 /* Divide channel_use by 8 to avoid wrapping around the counter */
362 load >>= CHAN_UTIL_SHIFT;
369 static ieee80211_txrx_result
370 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
373 rx->sta->channel_use_raw += rx->u.rx.load;
374 rx->sdata->channel_use_raw += rx->u.rx.load;
375 return TXRX_CONTINUE;
378 static ieee80211_txrx_result
379 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
381 struct ieee80211_local *local = rx->local;
382 struct sk_buff *skb = rx->skb;
384 if (unlikely(local->sta_hw_scanning))
385 return ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
387 if (unlikely(local->sta_sw_scanning)) {
388 /* drop all the other packets during a software scan anyway */
389 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status)
395 if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
396 /* scanning finished during invoking of handlers */
397 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
401 return TXRX_CONTINUE;
404 static ieee80211_txrx_result
405 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
407 struct ieee80211_hdr *hdr;
408 hdr = (struct ieee80211_hdr *) rx->skb->data;
410 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
411 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
412 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
413 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
415 if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
416 rx->local->dot11FrameDuplicateCount++;
417 rx->sta->num_duplicates++;
421 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
424 if (unlikely(rx->skb->len < 16)) {
425 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
429 /* Drop disallowed frame classes based on STA auth/assoc state;
430 * IEEE 802.11, Chap 5.5.
432 * 80211.o does filtering only based on association state, i.e., it
433 * drops Class 3 frames from not associated stations. hostapd sends
434 * deauth/disassoc frames when needed. In addition, hostapd is
435 * responsible for filtering on both auth and assoc states.
437 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
438 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
439 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
440 rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
441 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
442 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
443 !(rx->fc & IEEE80211_FCTL_TODS) &&
444 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
445 || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
446 /* Drop IBSS frames and frames for other hosts
454 return TXRX_CONTINUE;
458 static ieee80211_txrx_result
459 ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
461 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
464 ieee80211_txrx_result result = TXRX_DROP;
465 struct ieee80211_key *stakey = NULL;
470 * There are three types of keys:
472 * - PTK (pairwise keys)
473 * - STK (station-to-station pairwise keys)
475 * When selecting a key, we have to distinguish between multicast
476 * (including broadcast) and unicast frames, the latter can only
477 * use PTKs and STKs while the former always use GTKs. Unless, of
478 * course, actual WEP keys ("pre-RSNA") are used, then unicast
479 * frames can also use key indizes like GTKs. Hence, if we don't
480 * have a PTK/STK we check the key index for a WEP key.
482 * Note that in a regular BSS, multicast frames are sent by the
483 * AP only, associated stations unicast the frame to the AP first
484 * which then multicasts it on their behalf.
486 * There is also a slight problem in IBSS mode: GTKs are negotiated
487 * with each station, that is something we don't currently handle.
488 * The spec seems to expect that one negotiates the same key with
489 * every station but there's no such requirement; VLANs could be
493 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
494 return TXRX_CONTINUE;
497 * No point in finding a key and decrypting if the frame is neither
498 * addressed to us nor a multicast frame.
500 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
501 return TXRX_CONTINUE;
504 stakey = rcu_dereference(rx->sta->key);
506 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
510 * The device doesn't give us the IV so we won't be
511 * able to look up the key. That's ok though, we
512 * don't need to decrypt the frame, we just won't
513 * be able to keep statistics accurate.
514 * Except for key threshold notifications, should
515 * we somehow allow the driver to tell us which key
516 * the hardware used if this flag is set?
518 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
519 (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
520 return TXRX_CONTINUE;
522 hdrlen = ieee80211_get_hdrlen(rx->fc);
524 if (rx->skb->len < 8 + hdrlen)
525 return TXRX_DROP; /* TODO: count this? */
528 * no need to call ieee80211_wep_get_keyidx,
529 * it verifies a bunch of things we've done already
531 keyidx = rx->skb->data[hdrlen + 3] >> 6;
533 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
536 * RSNA-protected unicast frames should always be sent with
537 * pairwise or station-to-station keys, but for WEP we allow
538 * using a key index as well.
540 if (rx->key && rx->key->conf.alg != ALG_WEP &&
541 !is_multicast_ether_addr(hdr->addr1))
546 rx->key->tx_rx_count++;
547 /* TODO: add threshold stuff again */
549 #ifdef CONFIG_MAC80211_DEBUG
551 printk(KERN_DEBUG "%s: RX protected frame,"
552 " but have no key\n", rx->dev->name);
553 #endif /* CONFIG_MAC80211_DEBUG */
557 /* Check for weak IVs if possible */
558 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
559 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
560 (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
561 !(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
562 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
563 rx->sta->wep_weak_iv_count++;
565 switch (rx->key->conf.alg) {
567 result = ieee80211_crypto_wep_decrypt(rx);
570 result = ieee80211_crypto_tkip_decrypt(rx);
573 result = ieee80211_crypto_ccmp_decrypt(rx);
577 /* either the frame has been decrypted or will be dropped */
578 rx->u.rx.status->flag |= RX_FLAG_DECRYPTED;
583 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
585 struct ieee80211_sub_if_data *sdata;
586 DECLARE_MAC_BUF(mac);
588 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
591 atomic_inc(&sdata->bss->num_sta_ps);
592 sta->flags |= WLAN_STA_PS;
594 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
595 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
596 dev->name, print_mac(mac, sta->addr), sta->aid);
597 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
600 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
602 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
605 struct ieee80211_sub_if_data *sdata;
606 struct ieee80211_tx_packet_data *pkt_data;
607 DECLARE_MAC_BUF(mac);
609 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
611 atomic_dec(&sdata->bss->num_sta_ps);
612 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
614 if (!skb_queue_empty(&sta->ps_tx_buf)) {
615 if (local->ops->set_tim)
616 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
618 bss_tim_clear(local, sdata->bss, sta->aid);
620 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
621 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
622 dev->name, print_mac(mac, sta->addr), sta->aid);
623 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
624 /* Send all buffered frames to the station */
625 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
626 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
628 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
631 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
632 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
633 local->total_ps_buffered--;
635 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
636 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
637 "since STA not sleeping anymore\n", dev->name,
638 print_mac(mac, sta->addr), sta->aid);
639 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
640 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
647 static ieee80211_txrx_result
648 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
650 struct sta_info *sta = rx->sta;
651 struct net_device *dev = rx->dev;
652 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
655 return TXRX_CONTINUE;
657 /* Update last_rx only for IBSS packets which are for the current
658 * BSSID to avoid keeping the current IBSS network alive in cases where
659 * other STAs are using different BSSID. */
660 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
661 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
662 IEEE80211_IF_TYPE_IBSS);
663 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
664 sta->last_rx = jiffies;
666 if (!is_multicast_ether_addr(hdr->addr1) ||
667 rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
668 /* Update last_rx only for unicast frames in order to prevent
669 * the Probe Request frames (the only broadcast frames from a
670 * STA in infrastructure mode) from keeping a connection alive.
672 sta->last_rx = jiffies;
675 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
676 return TXRX_CONTINUE;
679 sta->rx_bytes += rx->skb->len;
680 sta->last_rssi = rx->u.rx.status->ssi;
681 sta->last_signal = rx->u.rx.status->signal;
682 sta->last_noise = rx->u.rx.status->noise;
684 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
685 /* Change STA power saving mode only in the end of a frame
686 * exchange sequence */
687 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
688 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
689 else if (!(sta->flags & WLAN_STA_PS) &&
690 (rx->fc & IEEE80211_FCTL_PM))
691 ap_sta_ps_start(dev, sta);
694 /* Drop data::nullfunc frames silently, since they are used only to
695 * control station power saving mode. */
696 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
697 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
698 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
699 /* Update counter and free packet here to avoid counting this
700 * as a dropped packed. */
702 dev_kfree_skb(rx->skb);
706 return TXRX_CONTINUE;
707 } /* ieee80211_rx_h_sta_process */
709 static inline struct ieee80211_fragment_entry *
710 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
711 unsigned int frag, unsigned int seq, int rx_queue,
712 struct sk_buff **skb)
714 struct ieee80211_fragment_entry *entry;
717 idx = sdata->fragment_next;
718 entry = &sdata->fragments[sdata->fragment_next++];
719 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
720 sdata->fragment_next = 0;
722 if (!skb_queue_empty(&entry->skb_list)) {
723 #ifdef CONFIG_MAC80211_DEBUG
724 struct ieee80211_hdr *hdr =
725 (struct ieee80211_hdr *) entry->skb_list.next->data;
726 DECLARE_MAC_BUF(mac);
727 DECLARE_MAC_BUF(mac2);
728 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
729 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
730 "addr1=%s addr2=%s\n",
731 sdata->dev->name, idx,
732 jiffies - entry->first_frag_time, entry->seq,
733 entry->last_frag, print_mac(mac, hdr->addr1),
734 print_mac(mac2, hdr->addr2));
735 #endif /* CONFIG_MAC80211_DEBUG */
736 __skb_queue_purge(&entry->skb_list);
739 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
741 entry->first_frag_time = jiffies;
743 entry->rx_queue = rx_queue;
744 entry->last_frag = frag;
746 entry->extra_len = 0;
751 static inline struct ieee80211_fragment_entry *
752 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
753 u16 fc, unsigned int frag, unsigned int seq,
754 int rx_queue, struct ieee80211_hdr *hdr)
756 struct ieee80211_fragment_entry *entry;
759 idx = sdata->fragment_next;
760 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
761 struct ieee80211_hdr *f_hdr;
766 idx = IEEE80211_FRAGMENT_MAX - 1;
768 entry = &sdata->fragments[idx];
769 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
770 entry->rx_queue != rx_queue ||
771 entry->last_frag + 1 != frag)
774 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
775 f_fc = le16_to_cpu(f_hdr->frame_control);
777 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
778 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
779 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
782 if (entry->first_frag_time + 2 * HZ < jiffies) {
783 __skb_queue_purge(&entry->skb_list);
792 static ieee80211_txrx_result
793 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
795 struct ieee80211_hdr *hdr;
797 unsigned int frag, seq;
798 struct ieee80211_fragment_entry *entry;
800 DECLARE_MAC_BUF(mac);
802 hdr = (struct ieee80211_hdr *) rx->skb->data;
803 sc = le16_to_cpu(hdr->seq_ctrl);
804 frag = sc & IEEE80211_SCTL_FRAG;
806 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
807 (rx->skb)->len < 24 ||
808 is_multicast_ether_addr(hdr->addr1))) {
812 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
814 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
817 /* This is the first fragment of a new frame. */
818 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
819 rx->u.rx.queue, &(rx->skb));
820 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
821 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
822 /* Store CCMP PN so that we can verify that the next
823 * fragment has a sequential PN value. */
825 memcpy(entry->last_pn,
826 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
832 /* This is a fragment for a frame that should already be pending in
833 * fragment cache. Add this fragment to the end of the pending entry.
835 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
836 rx->u.rx.queue, hdr);
838 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
842 /* Verify that MPDUs within one MSDU have sequential PN values.
843 * (IEEE 802.11i, 8.3.3.4.5) */
846 u8 pn[CCMP_PN_LEN], *rpn;
847 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
849 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
850 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
855 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
856 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
858 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
860 " PN=%02x%02x%02x%02x%02x%02x "
861 "(expected %02x%02x%02x%02x%02x%02x)\n",
862 rx->dev->name, print_mac(mac, hdr->addr2),
863 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
864 rpn[5], pn[0], pn[1], pn[2], pn[3],
868 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
871 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
872 __skb_queue_tail(&entry->skb_list, rx->skb);
873 entry->last_frag = frag;
874 entry->extra_len += rx->skb->len;
875 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
880 rx->skb = __skb_dequeue(&entry->skb_list);
881 if (skb_tailroom(rx->skb) < entry->extra_len) {
882 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
883 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
885 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
886 __skb_queue_purge(&entry->skb_list);
890 while ((skb = __skb_dequeue(&entry->skb_list))) {
891 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
895 /* Complete frame has been reassembled - process it now */
896 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
900 rx->sta->rx_packets++;
901 if (is_multicast_ether_addr(hdr->addr1))
902 rx->local->dot11MulticastReceivedFrameCount++;
904 ieee80211_led_rx(rx->local);
905 return TXRX_CONTINUE;
908 static ieee80211_txrx_result
909 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
911 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
914 DECLARE_MAC_BUF(mac);
916 if (likely(!rx->sta ||
917 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
918 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
919 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
920 return TXRX_CONTINUE;
922 if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
923 (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
926 skb = skb_dequeue(&rx->sta->tx_filtered);
928 skb = skb_dequeue(&rx->sta->ps_tx_buf);
930 rx->local->total_ps_buffered--;
932 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
933 skb_queue_empty(&rx->sta->ps_tx_buf);
936 struct ieee80211_hdr *hdr =
937 (struct ieee80211_hdr *) skb->data;
939 /* tell TX path to send one frame even though the STA may
940 * still remain is PS mode after this frame exchange */
943 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
944 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
945 print_mac(mac, rx->sta->addr), rx->sta->aid,
946 skb_queue_len(&rx->sta->ps_tx_buf));
947 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
949 /* Use MoreData flag to indicate whether there are more
950 * buffered frames for this STA */
951 if (no_pending_pkts) {
952 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
953 rx->sta->flags &= ~WLAN_STA_TIM;
955 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
959 if (no_pending_pkts) {
960 if (rx->local->ops->set_tim)
961 rx->local->ops->set_tim(local_to_hw(rx->local),
964 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
966 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
967 } else if (!rx->u.rx.sent_ps_buffered) {
968 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
969 "though there is no buffered frames for it\n",
970 rx->dev->name, print_mac(mac, rx->sta->addr));
971 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
975 /* Free PS Poll skb here instead of returning TXRX_DROP that would
976 * count as an dropped frame. */
977 dev_kfree_skb(rx->skb);
982 static ieee80211_txrx_result
983 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
986 u8 *data = rx->skb->data;
987 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
989 if (!WLAN_FC_IS_QOS_DATA(fc))
990 return TXRX_CONTINUE;
992 /* remove the qos control field, update frame type and meta-data */
993 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
994 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
995 /* change frame type to non QOS */
996 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
997 hdr->frame_control = cpu_to_le16(fc);
999 return TXRX_CONTINUE;
1003 ieee80211_802_1x_port_control(struct ieee80211_txrx_data *rx)
1005 if (unlikely(rx->sdata->ieee802_1x_pac &&
1006 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)))) {
1007 #ifdef CONFIG_MAC80211_DEBUG
1008 printk(KERN_DEBUG "%s: dropped frame "
1009 "(unauthorized port)\n", rx->dev->name);
1010 #endif /* CONFIG_MAC80211_DEBUG */
1018 ieee80211_drop_unencrypted(struct ieee80211_txrx_data *rx)
1021 * Pass through unencrypted frames if the hardware has
1022 * decrypted them already.
1024 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED)
1027 /* Drop unencrypted frames if key is set. */
1028 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1029 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1030 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1031 (rx->key || rx->sdata->drop_unencrypted))) {
1032 if (net_ratelimit())
1033 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
1034 "encryption\n", rx->dev->name);
1041 ieee80211_data_to_8023(struct ieee80211_txrx_data *rx)
1043 struct net_device *dev = rx->dev;
1044 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1045 u16 fc, hdrlen, ethertype;
1049 struct sk_buff *skb = rx->skb;
1050 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1051 DECLARE_MAC_BUF(mac);
1052 DECLARE_MAC_BUF(mac2);
1053 DECLARE_MAC_BUF(mac3);
1054 DECLARE_MAC_BUF(mac4);
1058 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1061 hdrlen = ieee80211_get_hdrlen(fc);
1063 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1065 * IEEE 802.11 address fields:
1066 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1067 * 0 0 DA SA BSSID n/a
1068 * 0 1 DA BSSID SA n/a
1069 * 1 0 BSSID SA DA n/a
1073 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1074 case IEEE80211_FCTL_TODS:
1076 memcpy(dst, hdr->addr3, ETH_ALEN);
1077 memcpy(src, hdr->addr2, ETH_ALEN);
1079 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
1080 sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) {
1081 if (net_ratelimit())
1082 printk(KERN_DEBUG "%s: dropped ToDS frame "
1083 "(BSSID=%s SA=%s DA=%s)\n",
1085 print_mac(mac, hdr->addr1),
1086 print_mac(mac2, hdr->addr2),
1087 print_mac(mac3, hdr->addr3));
1091 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1093 memcpy(dst, hdr->addr3, ETH_ALEN);
1094 memcpy(src, hdr->addr4, ETH_ALEN);
1096 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS)) {
1097 if (net_ratelimit())
1098 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
1099 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1101 print_mac(mac, hdr->addr1),
1102 print_mac(mac2, hdr->addr2),
1103 print_mac(mac3, hdr->addr3),
1104 print_mac(mac4, hdr->addr4));
1108 case IEEE80211_FCTL_FROMDS:
1110 memcpy(dst, hdr->addr1, ETH_ALEN);
1111 memcpy(src, hdr->addr3, ETH_ALEN);
1113 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
1114 (is_multicast_ether_addr(dst) &&
1115 !compare_ether_addr(src, dev->dev_addr)))
1120 memcpy(dst, hdr->addr1, ETH_ALEN);
1121 memcpy(src, hdr->addr2, ETH_ALEN);
1123 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
1124 if (net_ratelimit()) {
1125 printk(KERN_DEBUG "%s: dropped IBSS frame "
1126 "(DA=%s SA=%s BSSID=%s)\n",
1128 print_mac(mac, hdr->addr1),
1129 print_mac(mac2, hdr->addr2),
1130 print_mac(mac3, hdr->addr3));
1137 if (unlikely(skb->len - hdrlen < 8)) {
1138 if (net_ratelimit()) {
1139 printk(KERN_DEBUG "%s: RX too short data frame "
1140 "payload\n", dev->name);
1145 payload = skb->data + hdrlen;
1146 ethertype = (payload[6] << 8) | payload[7];
1148 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1149 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1150 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1151 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1152 * replace EtherType */
1153 skb_pull(skb, hdrlen + 6);
1154 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1155 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1157 struct ethhdr *ehdr;
1160 skb_pull(skb, hdrlen);
1161 len = htons(skb->len);
1162 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1163 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1164 memcpy(ehdr->h_source, src, ETH_ALEN);
1165 ehdr->h_proto = len;
1171 * requires that rx->skb is a frame with ethernet header
1173 static bool ieee80211_frame_allowed(struct ieee80211_txrx_data *rx)
1175 static const u8 pae_group_addr[ETH_ALEN]
1176 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1177 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1180 * Allow EAPOL frames to us/the PAE group address regardless
1181 * of whether the frame was encrypted or not.
1183 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1184 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1185 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1188 if (ieee80211_802_1x_port_control(rx) ||
1189 ieee80211_drop_unencrypted(rx))
1196 * requires that rx->skb is a frame with ethernet header
1199 ieee80211_deliver_skb(struct ieee80211_txrx_data *rx)
1201 struct net_device *dev = rx->dev;
1202 struct ieee80211_local *local = rx->local;
1203 struct sk_buff *skb, *xmit_skb;
1204 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1205 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1206 struct sta_info *dsta;
1211 if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1212 sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
1213 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
1214 if (is_multicast_ether_addr(ehdr->h_dest)) {
1216 * send multicast frames both to higher layers in
1217 * local net stack and back to the wireless medium
1219 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1220 if (!xmit_skb && net_ratelimit())
1221 printk(KERN_DEBUG "%s: failed to clone "
1222 "multicast frame\n", dev->name);
1224 dsta = sta_info_get(local, skb->data);
1225 if (dsta && dsta->dev == dev) {
1227 * The destination station is associated to
1228 * this AP (in this VLAN), so send the frame
1229 * directly to it and do not pass it to local
1241 /* deliver to local stack */
1242 skb->protocol = eth_type_trans(skb, dev);
1243 memset(skb->cb, 0, sizeof(skb->cb));
1248 /* send to wireless media */
1249 xmit_skb->protocol = htons(ETH_P_802_3);
1250 skb_reset_network_header(xmit_skb);
1251 skb_reset_mac_header(xmit_skb);
1252 dev_queue_xmit(xmit_skb);
1256 static ieee80211_txrx_result
1257 ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
1259 struct net_device *dev = rx->dev;
1260 struct ieee80211_local *local = rx->local;
1263 struct sk_buff *skb = rx->skb, *frame = NULL;
1264 const struct ethhdr *eth;
1268 DECLARE_MAC_BUF(mac);
1271 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1272 return TXRX_CONTINUE;
1274 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1277 if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU))
1278 return TXRX_CONTINUE;
1280 err = ieee80211_data_to_8023(rx);
1286 dev->stats.rx_packets++;
1287 dev->stats.rx_bytes += skb->len;
1289 /* skip the wrapping header */
1290 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1294 while (skb != frame) {
1296 __be16 len = eth->h_proto;
1297 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1299 remaining = skb->len;
1300 memcpy(dst, eth->h_dest, ETH_ALEN);
1301 memcpy(src, eth->h_source, ETH_ALEN);
1303 padding = ((4 - subframe_len) & 0x3);
1304 /* the last MSDU has no padding */
1305 if (subframe_len > remaining) {
1306 printk(KERN_DEBUG "%s: wrong buffer size", dev->name);
1310 skb_pull(skb, sizeof(struct ethhdr));
1311 /* if last subframe reuse skb */
1312 if (remaining <= subframe_len + padding)
1315 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1321 skb_reserve(frame, local->hw.extra_tx_headroom +
1322 sizeof(struct ethhdr));
1323 memcpy(skb_put(frame, ntohs(len)), skb->data,
1326 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1329 printk(KERN_DEBUG "%s: wrong buffer size ",
1331 dev_kfree_skb(frame);
1336 skb_reset_network_header(frame);
1338 frame->priority = skb->priority;
1341 payload = frame->data;
1342 ethertype = (payload[6] << 8) | payload[7];
1344 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1345 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1346 compare_ether_addr(payload,
1347 bridge_tunnel_header) == 0)) {
1348 /* remove RFC1042 or Bridge-Tunnel
1349 * encapsulation and replace EtherType */
1351 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1352 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1354 memcpy(skb_push(frame, sizeof(__be16)),
1355 &len, sizeof(__be16));
1356 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1357 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1360 if (!ieee80211_frame_allowed(rx)) {
1361 if (skb == frame) /* last frame */
1363 dev_kfree_skb(frame);
1367 ieee80211_deliver_skb(rx);
1373 static ieee80211_txrx_result
1374 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
1376 struct net_device *dev = rx->dev;
1381 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1382 return TXRX_CONTINUE;
1384 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1387 err = ieee80211_data_to_8023(rx);
1391 if (!ieee80211_frame_allowed(rx))
1396 dev->stats.rx_packets++;
1397 dev->stats.rx_bytes += rx->skb->len;
1399 ieee80211_deliver_skb(rx);
1404 static ieee80211_txrx_result
1405 ieee80211_rx_h_ctrl(struct ieee80211_txrx_data *rx)
1407 struct ieee80211_local *local = rx->local;
1408 struct ieee80211_hw *hw = &local->hw;
1409 struct sk_buff *skb = rx->skb;
1410 struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data;
1411 struct tid_ampdu_rx *tid_agg_rx;
1415 if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL))
1416 return TXRX_CONTINUE;
1418 if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) {
1420 return TXRX_CONTINUE;
1421 tid = le16_to_cpu(bar->control) >> 12;
1422 tid_agg_rx = &(rx->sta->ampdu_mlme.tid_rx[tid]);
1423 if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL)
1424 return TXRX_CONTINUE;
1426 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1428 /* reset session timer */
1429 if (tid_agg_rx->timeout) {
1430 unsigned long expires =
1431 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1432 mod_timer(&tid_agg_rx->session_timer, expires);
1435 /* manage reordering buffer according to requested */
1436 /* sequence number */
1438 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1444 return TXRX_CONTINUE;
1447 static ieee80211_txrx_result
1448 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1450 struct ieee80211_sub_if_data *sdata;
1452 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
1455 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1456 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1457 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
1458 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1459 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1466 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1467 struct ieee80211_local *local,
1468 ieee80211_rx_handler *handlers,
1469 struct ieee80211_txrx_data *rx,
1470 struct sta_info *sta)
1472 ieee80211_rx_handler *handler;
1473 ieee80211_txrx_result res = TXRX_DROP;
1475 for (handler = handlers; *handler != NULL; handler++) {
1476 res = (*handler)(rx);
1482 I802_DEBUG_INC(local->rx_handlers_drop);
1487 I802_DEBUG_INC(local->rx_handlers_queued);
1493 if (res == TXRX_DROP)
1494 dev_kfree_skb(rx->skb);
1498 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1499 ieee80211_rx_handler *handlers,
1500 struct ieee80211_txrx_data *rx,
1501 struct sta_info *sta)
1503 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1505 dev_kfree_skb(rx->skb);
1508 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1509 struct ieee80211_hdr *hdr,
1510 struct sta_info *sta,
1511 struct ieee80211_txrx_data *rx)
1514 DECLARE_MAC_BUF(mac);
1515 DECLARE_MAC_BUF(mac2);
1517 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1518 if (rx->skb->len >= hdrlen + 4)
1519 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1523 if (net_ratelimit())
1524 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1525 "failure from %s to %s keyidx=%d\n",
1526 dev->name, print_mac(mac, hdr->addr2),
1527 print_mac(mac2, hdr->addr1), keyidx);
1531 * Some hardware seem to generate incorrect Michael MIC
1532 * reports; ignore them to avoid triggering countermeasures.
1534 if (net_ratelimit())
1535 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1536 "error for unknown address %s\n",
1537 dev->name, print_mac(mac, hdr->addr2));
1541 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1542 if (net_ratelimit())
1543 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1544 "error for a frame with no PROTECTED flag (src "
1545 "%s)\n", dev->name, print_mac(mac, hdr->addr2));
1549 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
1551 * APs with pairwise keys should never receive Michael MIC
1552 * errors for non-zero keyidx because these are reserved for
1553 * group keys and only the AP is sending real multicast
1554 * frames in the BSS.
1556 if (net_ratelimit())
1557 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1558 "a frame with non-zero keyidx (%d)"
1559 " (src %s)\n", dev->name, keyidx,
1560 print_mac(mac, hdr->addr2));
1564 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1565 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1566 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1567 if (net_ratelimit())
1568 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1569 "error for a frame that cannot be encrypted "
1570 "(fc=0x%04x) (src %s)\n",
1571 dev->name, rx->fc, print_mac(mac, hdr->addr2));
1575 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1577 dev_kfree_skb(rx->skb);
1581 ieee80211_rx_handler ieee80211_rx_handlers[] =
1583 ieee80211_rx_h_if_stats,
1584 ieee80211_rx_h_passive_scan,
1585 ieee80211_rx_h_check,
1586 ieee80211_rx_h_decrypt,
1587 ieee80211_rx_h_sta_process,
1588 ieee80211_rx_h_defragment,
1589 ieee80211_rx_h_ps_poll,
1590 ieee80211_rx_h_michael_mic_verify,
1591 /* this must be after decryption - so header is counted in MPDU mic
1592 * must be before pae and data, so QOS_DATA format frames
1593 * are not passed to user space by these functions
1595 ieee80211_rx_h_remove_qos_control,
1596 ieee80211_rx_h_amsdu,
1597 ieee80211_rx_h_data,
1598 ieee80211_rx_h_ctrl,
1599 ieee80211_rx_h_mgmt,
1603 /* main receive path */
1605 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1606 u8 *bssid, struct ieee80211_txrx_data *rx,
1607 struct ieee80211_hdr *hdr)
1609 int multicast = is_multicast_ether_addr(hdr->addr1);
1611 switch (sdata->vif.type) {
1612 case IEEE80211_IF_TYPE_STA:
1615 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1616 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1618 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1619 } else if (!multicast &&
1620 compare_ether_addr(sdata->dev->dev_addr,
1622 if (!(sdata->dev->flags & IFF_PROMISC))
1624 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1627 case IEEE80211_IF_TYPE_IBSS:
1630 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1631 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1633 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1634 } else if (!multicast &&
1635 compare_ether_addr(sdata->dev->dev_addr,
1637 if (!(sdata->dev->flags & IFF_PROMISC))
1639 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1640 } else if (!rx->sta)
1641 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1644 case IEEE80211_IF_TYPE_VLAN:
1645 case IEEE80211_IF_TYPE_AP:
1647 if (compare_ether_addr(sdata->dev->dev_addr,
1650 } else if (!ieee80211_bssid_match(bssid,
1651 sdata->dev->dev_addr)) {
1652 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1654 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1656 if (sdata->dev == sdata->local->mdev &&
1657 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1658 /* do not receive anything via
1659 * master device when not scanning */
1662 case IEEE80211_IF_TYPE_WDS:
1664 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1666 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1669 case IEEE80211_IF_TYPE_MNTR:
1670 /* take everything */
1672 case IEEE80211_IF_TYPE_INVALID:
1673 /* should never get here */
1682 * This is the actual Rx frames handler. as it blongs to Rx path it must
1683 * be called with rcu_read_lock protection.
1685 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1686 struct sk_buff *skb,
1687 struct ieee80211_rx_status *status,
1690 struct ieee80211_local *local = hw_to_local(hw);
1691 struct ieee80211_sub_if_data *sdata;
1692 struct sta_info *sta;
1693 struct ieee80211_hdr *hdr;
1694 struct ieee80211_txrx_data rx;
1697 struct ieee80211_sub_if_data *prev = NULL;
1698 struct sk_buff *skb_new;
1701 hdr = (struct ieee80211_hdr *) skb->data;
1702 memset(&rx, 0, sizeof(rx));
1706 rx.u.rx.status = status;
1707 rx.u.rx.load = load;
1708 rx.fc = le16_to_cpu(hdr->frame_control);
1709 type = rx.fc & IEEE80211_FCTL_FTYPE;
1711 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1712 local->dot11ReceivedFragmentCount++;
1714 sta = rx.sta = sta_info_get(local, hdr->addr2);
1716 rx.dev = rx.sta->dev;
1717 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1720 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1721 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1725 if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1726 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1728 ieee80211_parse_qos(&rx);
1729 ieee80211_verify_ip_alignment(&rx);
1733 if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&
1734 !atomic_read(&local->iff_promiscs) &&
1735 !is_multicast_ether_addr(hdr->addr1)) {
1736 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1737 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1743 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1744 if (!netif_running(sdata->dev))
1747 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
1750 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1751 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1752 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1753 /* prepare_for_handlers can change sta */
1760 * frame is destined for this interface, but if it's not
1761 * also for the previous one we handle that after the
1762 * loop to avoid copying the SKB once too much
1771 * frame was destined for the previous interface
1772 * so invoke RX handlers for it
1775 skb_new = skb_copy(skb, GFP_ATOMIC);
1777 if (net_ratelimit())
1778 printk(KERN_DEBUG "%s: failed to copy "
1779 "multicast frame for %s",
1780 wiphy_name(local->hw.wiphy),
1784 rx.fc = le16_to_cpu(hdr->frame_control);
1788 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1793 rx.fc = le16_to_cpu(hdr->frame_control);
1797 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1807 #define SEQ_MODULO 0x1000
1808 #define SEQ_MASK 0xfff
1810 static inline int seq_less(u16 sq1, u16 sq2)
1812 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1815 static inline u16 seq_inc(u16 sq)
1817 return ((sq + 1) & SEQ_MASK);
1820 static inline u16 seq_sub(u16 sq1, u16 sq2)
1822 return ((sq1 - sq2) & SEQ_MASK);
1827 * As it function blongs to Rx path it must be called with
1828 * the proper rcu_read_lock protection for its flow.
1830 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
1831 struct tid_ampdu_rx *tid_agg_rx,
1832 struct sk_buff *skb, u16 mpdu_seq_num,
1835 struct ieee80211_local *local = hw_to_local(hw);
1836 struct ieee80211_rx_status status;
1837 u16 head_seq_num, buf_size;
1841 buf_size = tid_agg_rx->buf_size;
1842 head_seq_num = tid_agg_rx->head_seq_num;
1844 /* frame with out of date sequence number */
1845 if (seq_less(mpdu_seq_num, head_seq_num)) {
1850 /* if frame sequence number exceeds our buffering window size or
1851 * block Ack Request arrived - release stored frames */
1852 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
1853 /* new head to the ordering buffer */
1855 head_seq_num = mpdu_seq_num;
1858 seq_inc(seq_sub(mpdu_seq_num, buf_size));
1859 /* release stored frames up to new head to stack */
1860 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1861 index = seq_sub(tid_agg_rx->head_seq_num,
1863 % tid_agg_rx->buf_size;
1865 if (tid_agg_rx->reorder_buf[index]) {
1866 /* release the reordered frames to stack */
1868 tid_agg_rx->reorder_buf[index]->cb,
1870 pkt_load = ieee80211_rx_load_stats(local,
1871 tid_agg_rx->reorder_buf[index],
1873 __ieee80211_rx_handle_packet(hw,
1874 tid_agg_rx->reorder_buf[index],
1876 tid_agg_rx->stored_mpdu_num--;
1877 tid_agg_rx->reorder_buf[index] = NULL;
1879 tid_agg_rx->head_seq_num =
1880 seq_inc(tid_agg_rx->head_seq_num);
1886 /* now the new frame is always in the range of the reordering */
1888 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
1889 % tid_agg_rx->buf_size;
1890 /* check if we already stored this frame */
1891 if (tid_agg_rx->reorder_buf[index]) {
1896 /* if arrived mpdu is in the right order and nothing else stored */
1897 /* release it immediately */
1898 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1899 tid_agg_rx->stored_mpdu_num == 0) {
1900 tid_agg_rx->head_seq_num =
1901 seq_inc(tid_agg_rx->head_seq_num);
1905 /* put the frame in the reordering buffer */
1906 tid_agg_rx->reorder_buf[index] = skb;
1907 tid_agg_rx->stored_mpdu_num++;
1908 /* release the buffer until next missing frame */
1909 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
1910 % tid_agg_rx->buf_size;
1911 while (tid_agg_rx->reorder_buf[index]) {
1912 /* release the reordered frame back to stack */
1913 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
1915 pkt_load = ieee80211_rx_load_stats(local,
1916 tid_agg_rx->reorder_buf[index],
1918 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
1920 tid_agg_rx->stored_mpdu_num--;
1921 tid_agg_rx->reorder_buf[index] = NULL;
1922 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
1923 index = seq_sub(tid_agg_rx->head_seq_num,
1924 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
1929 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
1930 struct sk_buff *skb)
1932 struct ieee80211_hw *hw = &local->hw;
1933 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1934 struct sta_info *sta;
1935 struct tid_ampdu_rx *tid_agg_rx;
1941 sta = sta_info_get(local, hdr->addr2);
1945 fc = le16_to_cpu(hdr->frame_control);
1947 /* filter the QoS data rx stream according to
1948 * STA/TID and check if this STA/TID is on aggregation */
1949 if (!WLAN_FC_IS_QOS_DATA(fc))
1952 qc = skb->data + ieee80211_get_hdrlen(fc) - QOS_CONTROL_LEN;
1953 tid = qc[0] & QOS_CONTROL_TID_MASK;
1954 tid_agg_rx = &(sta->ampdu_mlme.tid_rx[tid]);
1956 if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL)
1959 /* null data frames are excluded */
1960 if (unlikely(fc & IEEE80211_STYPE_NULLFUNC))
1963 /* new un-ordered ampdu frame - process it */
1965 /* reset session timer */
1966 if (tid_agg_rx->timeout) {
1967 unsigned long expires =
1968 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1969 mod_timer(&tid_agg_rx->session_timer, expires);
1972 /* if this mpdu is fragmented - terminate rx aggregation session */
1973 sc = le16_to_cpu(hdr->seq_ctrl);
1974 if (sc & IEEE80211_SCTL_FRAG) {
1975 ieee80211_sta_stop_rx_ba_session(sta->dev, sta->addr,
1976 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
1981 /* according to mpdu sequence number deal with reordering buffer */
1982 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1983 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
1992 * This is the receive path handler. It is called by a low level driver when an
1993 * 802.11 MPDU is received from the hardware.
1995 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1996 struct ieee80211_rx_status *status)
1998 struct ieee80211_local *local = hw_to_local(hw);
2002 * key references and virtual interfaces are protected using RCU
2003 * and this requires that we are in a read-side RCU section during
2004 * receive processing
2009 * Frames with failed FCS/PLCP checksum are not returned,
2010 * all other frames are returned without radiotap header
2011 * if it was previously present.
2012 * Also, frames with less than 16 bytes are dropped.
2014 skb = ieee80211_rx_monitor(local, skb, status);
2020 pkt_load = ieee80211_rx_load_stats(local, skb, status);
2021 local->channel_use_raw += pkt_load;
2023 if (!ieee80211_rx_reorder_ampdu(local, skb))
2024 __ieee80211_rx_handle_packet(hw, skb, status, pkt_load);
2028 EXPORT_SYMBOL(__ieee80211_rx);
2030 /* This is a version of the rx handler that can be called from hard irq
2031 * context. Post the skb on the queue and schedule the tasklet */
2032 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2033 struct ieee80211_rx_status *status)
2035 struct ieee80211_local *local = hw_to_local(hw);
2037 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2039 skb->dev = local->mdev;
2040 /* copy status into skb->cb for use by tasklet */
2041 memcpy(skb->cb, status, sizeof(*status));
2042 skb->pkt_type = IEEE80211_RX_MSG;
2043 skb_queue_tail(&local->skb_queue, skb);
2044 tasklet_schedule(&local->tasklet);
2046 EXPORT_SYMBOL(ieee80211_rx_irqsafe);