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 <net/iw_handler.h>
17 #include <net/mac80211.h>
18 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "ieee80211_led.h"
22 #include "ieee80211_common.h"
30 * these don't have dev/sdata fields in the rx data
31 * The sta value should also not be used because it may
32 * be NULL even though a STA (in IBSS mode) will be added.
35 static ieee80211_txrx_result
36 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
38 u8 *data = rx->skb->data;
41 /* does the frame have a qos control field? */
42 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
43 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
44 /* frame has qos control */
45 tid = qc[0] & QOS_CONTROL_TID_MASK;
47 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
48 /* Separate TID for management frames */
49 tid = NUM_RX_DATA_QUEUES - 1;
51 /* no qos control present */
52 tid = 0; /* 802.1d - Best Effort */
56 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
57 /* only a debug counter, sta might not be assigned properly yet */
59 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
62 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
63 * For now, set skb->priority to 0 for other cases. */
64 rx->skb->priority = (tid > 7) ? 0 : tid;
69 static ieee80211_txrx_result
70 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
72 struct ieee80211_local *local = rx->local;
73 struct sk_buff *skb = rx->skb;
74 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
75 u32 load = 0, hdrtime;
76 struct ieee80211_rate *rate;
77 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
80 /* Estimate total channel use caused by this frame */
82 if (unlikely(mode->num_rates < 0))
85 rate = &mode->rates[0];
86 for (i = 0; i < mode->num_rates; i++) {
87 if (mode->rates[i].val == rx->u.rx.status->rate) {
88 rate = &mode->rates[i];
93 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
94 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
96 if (mode->mode == MODE_IEEE80211A ||
97 mode->mode == MODE_ATHEROS_TURBO ||
98 mode->mode == MODE_ATHEROS_TURBOG ||
99 (mode->mode == MODE_IEEE80211G &&
100 rate->flags & IEEE80211_RATE_ERP))
101 hdrtime = CHAN_UTIL_HDR_SHORT;
103 hdrtime = CHAN_UTIL_HDR_LONG;
106 if (!is_multicast_ether_addr(hdr->addr1))
109 load += skb->len * rate->rate_inv;
111 /* Divide channel_use by 8 to avoid wrapping around the counter */
112 load >>= CHAN_UTIL_SHIFT;
113 local->channel_use_raw += load;
114 rx->u.rx.load = load;
116 return TXRX_CONTINUE;
119 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
121 ieee80211_rx_h_parse_qos,
122 ieee80211_rx_h_load_stats,
128 static ieee80211_txrx_result
129 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
132 rx->sta->channel_use_raw += rx->u.rx.load;
133 rx->sdata->channel_use_raw += rx->u.rx.load;
134 return TXRX_CONTINUE;
138 ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
139 struct ieee80211_rx_status *status)
141 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
142 struct ieee80211_sub_if_data *sdata;
143 struct ieee80211_rate *rate;
144 struct ieee80211_rtap_hdr {
145 struct ieee80211_radiotap_header hdr;
151 } __attribute__ ((packed)) *rthdr;
155 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
157 if (status->flag & RX_FLAG_RADIOTAP)
160 if (skb_headroom(skb) < sizeof(*rthdr)) {
161 I802_DEBUG_INC(local->rx_expand_skb_head);
162 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
168 rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
169 memset(rthdr, 0, sizeof(*rthdr));
170 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
171 rthdr->hdr.it_present =
172 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
173 (1 << IEEE80211_RADIOTAP_RATE) |
174 (1 << IEEE80211_RADIOTAP_CHANNEL) |
175 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
176 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
177 IEEE80211_RADIOTAP_F_FCS : 0;
178 rate = ieee80211_get_rate(local, status->phymode, status->rate);
180 rthdr->rate = rate->rate / 5;
181 rthdr->chan_freq = cpu_to_le16(status->freq);
183 status->phymode == MODE_IEEE80211A ?
184 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
185 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
186 rthdr->antsignal = status->ssi;
189 sdata->stats.rx_packets++;
190 sdata->stats.rx_bytes += skb->len;
192 skb_set_mac_header(skb, 0);
193 skb->ip_summed = CHECKSUM_UNNECESSARY;
194 skb->pkt_type = PACKET_OTHERHOST;
195 skb->protocol = htons(ETH_P_802_2);
196 memset(skb->cb, 0, sizeof(skb->cb));
200 static ieee80211_txrx_result
201 ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
203 if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
204 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
208 if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
209 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data));
211 return TXRX_CONTINUE;
214 static ieee80211_txrx_result
215 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
217 struct ieee80211_local *local = rx->local;
218 struct sk_buff *skb = rx->skb;
220 if (unlikely(local->sta_scanning != 0)) {
221 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
225 if (unlikely(rx->u.rx.in_scan)) {
226 /* scanning finished during invoking of handlers */
227 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
231 return TXRX_CONTINUE;
234 static ieee80211_txrx_result
235 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
237 struct ieee80211_hdr *hdr;
238 hdr = (struct ieee80211_hdr *) rx->skb->data;
240 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
241 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
242 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
243 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
245 if (rx->u.rx.ra_match) {
246 rx->local->dot11FrameDuplicateCount++;
247 rx->sta->num_duplicates++;
251 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
254 if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
255 rx->skb->len > FCS_LEN)
256 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
258 if (unlikely(rx->skb->len < 16)) {
259 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
263 if (!rx->u.rx.ra_match)
264 rx->skb->pkt_type = PACKET_OTHERHOST;
265 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
266 rx->skb->pkt_type = PACKET_HOST;
267 else if (is_multicast_ether_addr(hdr->addr1)) {
268 if (is_broadcast_ether_addr(hdr->addr1))
269 rx->skb->pkt_type = PACKET_BROADCAST;
271 rx->skb->pkt_type = PACKET_MULTICAST;
273 rx->skb->pkt_type = PACKET_OTHERHOST;
275 /* Drop disallowed frame classes based on STA auth/assoc state;
276 * IEEE 802.11, Chap 5.5.
278 * 80211.o does filtering only based on association state, i.e., it
279 * drops Class 3 frames from not associated stations. hostapd sends
280 * deauth/disassoc frames when needed. In addition, hostapd is
281 * responsible for filtering on both auth and assoc states.
283 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
284 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
285 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
286 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
287 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
288 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
289 !(rx->fc & IEEE80211_FCTL_TODS) &&
290 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
291 || !rx->u.rx.ra_match) {
292 /* Drop IBSS frames and frames for other hosts
297 if (!rx->local->apdev)
300 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
301 ieee80211_msg_sta_not_assoc);
305 return TXRX_CONTINUE;
309 static ieee80211_txrx_result
310 ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
312 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
319 * There are three types of keys:
321 * - PTK (pairwise keys)
322 * - STK (station-to-station pairwise keys)
324 * When selecting a key, we have to distinguish between multicast
325 * (including broadcast) and unicast frames, the latter can only
326 * use PTKs and STKs while the former always use GTKs. Unless, of
327 * course, actual WEP keys ("pre-RSNA") are used, then unicast
328 * frames can also use key indizes like GTKs. Hence, if we don't
329 * have a PTK/STK we check the key index for a WEP key.
331 * There is also a slight problem in IBSS mode: GTKs are negotiated
332 * with each station, that is something we don't currently handle.
335 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
336 return TXRX_CONTINUE;
339 * No point in finding a key if the frame is neither
340 * addressed to us nor a multicast frame.
342 if (!rx->u.rx.ra_match)
343 return TXRX_CONTINUE;
345 if (!is_multicast_ether_addr(hdr->addr1) && rx->sta && rx->sta->key) {
346 rx->key = rx->sta->key;
349 * The device doesn't give us the IV so we won't be
350 * able to look up the key. That's ok though, we
351 * don't need to decrypt the frame, we just won't
352 * be able to keep statistics accurate.
353 * Except for key threshold notifications, should
354 * we somehow allow the driver to tell us which key
355 * the hardware used if this flag is set?
357 if (!(rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV))
358 return TXRX_CONTINUE;
360 hdrlen = ieee80211_get_hdrlen(rx->fc);
362 if (rx->skb->len < 8 + hdrlen)
363 return TXRX_DROP; /* TODO: count this? */
366 * no need to call ieee80211_wep_get_keyidx,
367 * it verifies a bunch of things we've done already
369 keyidx = rx->skb->data[hdrlen + 3] >> 6;
371 rx->key = rx->sdata->keys[keyidx];
374 * RSNA-protected unicast frames should always be sent with
375 * pairwise or station-to-station keys, but for WEP we allow
376 * using a key index as well.
378 if (rx->key && rx->key->alg != ALG_WEP &&
379 !is_multicast_ether_addr(hdr->addr1))
384 rx->key->tx_rx_count++;
385 if (unlikely(rx->local->key_tx_rx_threshold &&
386 rx->key->tx_rx_count >
387 rx->local->key_tx_rx_threshold)) {
388 ieee80211_key_threshold_notify(rx->dev, rx->key,
393 return TXRX_CONTINUE;
396 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
398 struct ieee80211_sub_if_data *sdata;
399 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
402 atomic_inc(&sdata->bss->num_sta_ps);
403 sta->flags |= WLAN_STA_PS;
405 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
406 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
407 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
408 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
411 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
413 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
416 struct ieee80211_sub_if_data *sdata;
417 struct ieee80211_tx_packet_data *pkt_data;
419 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
421 atomic_dec(&sdata->bss->num_sta_ps);
422 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
424 if (!skb_queue_empty(&sta->ps_tx_buf)) {
425 if (local->ops->set_tim)
426 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
428 bss_tim_clear(local, sdata->bss, sta->aid);
430 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
431 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
432 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
433 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
434 /* Send all buffered frames to the station */
435 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
436 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
438 pkt_data->requeue = 1;
441 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
442 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
443 local->total_ps_buffered--;
445 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
446 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
447 "since STA not sleeping anymore\n", dev->name,
448 MAC_ARG(sta->addr), sta->aid);
449 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
450 pkt_data->requeue = 1;
457 static ieee80211_txrx_result
458 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
460 struct sta_info *sta = rx->sta;
461 struct net_device *dev = rx->dev;
462 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
465 return TXRX_CONTINUE;
467 /* Update last_rx only for IBSS packets which are for the current
468 * BSSID to avoid keeping the current IBSS network alive in cases where
469 * other STAs are using different BSSID. */
470 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
471 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
472 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
473 sta->last_rx = jiffies;
475 if (!is_multicast_ether_addr(hdr->addr1) ||
476 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
477 /* Update last_rx only for unicast frames in order to prevent
478 * the Probe Request frames (the only broadcast frames from a
479 * STA in infrastructure mode) from keeping a connection alive.
481 sta->last_rx = jiffies;
484 if (!rx->u.rx.ra_match)
485 return TXRX_CONTINUE;
488 sta->rx_bytes += rx->skb->len;
489 sta->last_rssi = (sta->last_rssi * 15 +
490 rx->u.rx.status->ssi) / 16;
491 sta->last_signal = (sta->last_signal * 15 +
492 rx->u.rx.status->signal) / 16;
493 sta->last_noise = (sta->last_noise * 15 +
494 rx->u.rx.status->noise) / 16;
496 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
497 /* Change STA power saving mode only in the end of a frame
498 * exchange sequence */
499 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
500 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
501 else if (!(sta->flags & WLAN_STA_PS) &&
502 (rx->fc & IEEE80211_FCTL_PM))
503 ap_sta_ps_start(dev, sta);
506 /* Drop data::nullfunc frames silently, since they are used only to
507 * control station power saving mode. */
508 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
509 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
510 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
511 /* Update counter and free packet here to avoid counting this
512 * as a dropped packed. */
514 dev_kfree_skb(rx->skb);
518 return TXRX_CONTINUE;
519 } /* ieee80211_rx_h_sta_process */
521 static ieee80211_txrx_result
522 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
524 if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
525 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
526 !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match)
527 return TXRX_CONTINUE;
529 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
530 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
531 rx->key->force_sw_encrypt) {
532 u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
534 rx->sta->wep_weak_iv_count++;
538 return TXRX_CONTINUE;
541 static ieee80211_txrx_result
542 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
544 if ((rx->key && rx->key->alg != ALG_WEP) ||
545 !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
546 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
547 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
548 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
549 return TXRX_CONTINUE;
553 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
558 if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
559 rx->key->force_sw_encrypt) {
560 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
562 printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
563 "failed\n", rx->dev->name);
566 } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
567 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
569 skb_trim(rx->skb, rx->skb->len - 4);
572 return TXRX_CONTINUE;
575 static inline struct ieee80211_fragment_entry *
576 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
577 unsigned int frag, unsigned int seq, int rx_queue,
578 struct sk_buff **skb)
580 struct ieee80211_fragment_entry *entry;
583 idx = sdata->fragment_next;
584 entry = &sdata->fragments[sdata->fragment_next++];
585 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
586 sdata->fragment_next = 0;
588 if (!skb_queue_empty(&entry->skb_list)) {
589 #ifdef CONFIG_MAC80211_DEBUG
590 struct ieee80211_hdr *hdr =
591 (struct ieee80211_hdr *) entry->skb_list.next->data;
592 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
593 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
594 "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
595 sdata->dev->name, idx,
596 jiffies - entry->first_frag_time, entry->seq,
597 entry->last_frag, MAC_ARG(hdr->addr1),
598 MAC_ARG(hdr->addr2));
599 #endif /* CONFIG_MAC80211_DEBUG */
600 __skb_queue_purge(&entry->skb_list);
603 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
605 entry->first_frag_time = jiffies;
607 entry->rx_queue = rx_queue;
608 entry->last_frag = frag;
610 entry->extra_len = 0;
615 static inline struct ieee80211_fragment_entry *
616 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
617 u16 fc, unsigned int frag, unsigned int seq,
618 int rx_queue, struct ieee80211_hdr *hdr)
620 struct ieee80211_fragment_entry *entry;
623 idx = sdata->fragment_next;
624 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
625 struct ieee80211_hdr *f_hdr;
630 idx = IEEE80211_FRAGMENT_MAX - 1;
632 entry = &sdata->fragments[idx];
633 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
634 entry->rx_queue != rx_queue ||
635 entry->last_frag + 1 != frag)
638 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
639 f_fc = le16_to_cpu(f_hdr->frame_control);
641 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
642 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
643 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
646 if (entry->first_frag_time + 2 * HZ < jiffies) {
647 __skb_queue_purge(&entry->skb_list);
656 static ieee80211_txrx_result
657 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
659 struct ieee80211_hdr *hdr;
661 unsigned int frag, seq;
662 struct ieee80211_fragment_entry *entry;
665 hdr = (struct ieee80211_hdr *) rx->skb->data;
666 sc = le16_to_cpu(hdr->seq_ctrl);
667 frag = sc & IEEE80211_SCTL_FRAG;
669 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
670 (rx->skb)->len < 24 ||
671 is_multicast_ether_addr(hdr->addr1))) {
675 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
677 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
680 /* This is the first fragment of a new frame. */
681 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
682 rx->u.rx.queue, &(rx->skb));
683 if (rx->key && rx->key->alg == ALG_CCMP &&
684 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
685 /* Store CCMP PN so that we can verify that the next
686 * fragment has a sequential PN value. */
688 memcpy(entry->last_pn,
689 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
695 /* This is a fragment for a frame that should already be pending in
696 * fragment cache. Add this fragment to the end of the pending entry.
698 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
699 rx->u.rx.queue, hdr);
701 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
705 /* Verify that MPDUs within one MSDU have sequential PN values.
706 * (IEEE 802.11i, 8.3.3.4.5) */
709 u8 pn[CCMP_PN_LEN], *rpn;
710 if (!rx->key || rx->key->alg != ALG_CCMP)
712 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
713 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
718 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
719 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
721 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
722 "sequential A2=" MAC_FMT
723 " PN=%02x%02x%02x%02x%02x%02x "
724 "(expected %02x%02x%02x%02x%02x%02x)\n",
725 rx->dev->name, MAC_ARG(hdr->addr2),
726 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
727 rpn[5], pn[0], pn[1], pn[2], pn[3],
731 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
734 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
735 __skb_queue_tail(&entry->skb_list, rx->skb);
736 entry->last_frag = frag;
737 entry->extra_len += rx->skb->len;
738 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
743 rx->skb = __skb_dequeue(&entry->skb_list);
744 if (skb_tailroom(rx->skb) < entry->extra_len) {
745 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
746 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
748 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
749 __skb_queue_purge(&entry->skb_list);
753 while ((skb = __skb_dequeue(&entry->skb_list))) {
754 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
758 /* Complete frame has been reassembled - process it now */
763 rx->sta->rx_packets++;
764 if (is_multicast_ether_addr(hdr->addr1))
765 rx->local->dot11MulticastReceivedFrameCount++;
767 ieee80211_led_rx(rx->local);
768 return TXRX_CONTINUE;
771 static ieee80211_txrx_result
772 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
777 if (likely(!rx->sta ||
778 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
779 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
781 return TXRX_CONTINUE;
783 skb = skb_dequeue(&rx->sta->tx_filtered);
785 skb = skb_dequeue(&rx->sta->ps_tx_buf);
787 rx->local->total_ps_buffered--;
789 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
790 skb_queue_empty(&rx->sta->ps_tx_buf);
793 struct ieee80211_hdr *hdr =
794 (struct ieee80211_hdr *) skb->data;
796 /* tell TX path to send one frame even though the STA may
797 * still remain is PS mode after this frame exchange */
800 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
801 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
803 MAC_ARG(rx->sta->addr), rx->sta->aid,
804 skb_queue_len(&rx->sta->ps_tx_buf));
805 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
807 /* Use MoreData flag to indicate whether there are more
808 * buffered frames for this STA */
809 if (no_pending_pkts) {
810 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
811 rx->sta->flags &= ~WLAN_STA_TIM;
813 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
817 if (no_pending_pkts) {
818 if (rx->local->ops->set_tim)
819 rx->local->ops->set_tim(local_to_hw(rx->local),
822 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
824 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
825 } else if (!rx->u.rx.sent_ps_buffered) {
826 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
827 "though there is no buffered frames for it\n",
828 rx->dev->name, MAC_ARG(rx->sta->addr));
829 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
833 /* Free PS Poll skb here instead of returning TXRX_DROP that would
834 * count as an dropped frame. */
835 dev_kfree_skb(rx->skb);
840 static ieee80211_txrx_result
841 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
844 u8 *data = rx->skb->data;
845 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
847 if (!WLAN_FC_IS_QOS_DATA(fc))
848 return TXRX_CONTINUE;
850 /* remove the qos control field, update frame type and meta-data */
851 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
852 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
853 /* change frame type to non QOS */
854 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
855 hdr->frame_control = cpu_to_le16(fc);
857 return TXRX_CONTINUE;
860 static ieee80211_txrx_result
861 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
863 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
864 rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) {
865 /* Pass both encrypted and unencrypted EAPOL frames to user
866 * space for processing. */
867 if (!rx->local->apdev)
869 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
870 ieee80211_msg_normal);
874 if (unlikely(rx->sdata->ieee802_1x &&
875 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
876 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
877 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
878 !ieee80211_is_eapol(rx->skb))) {
879 #ifdef CONFIG_MAC80211_DEBUG
880 struct ieee80211_hdr *hdr =
881 (struct ieee80211_hdr *) rx->skb->data;
882 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
883 " (unauthorized port)\n", rx->dev->name,
884 MAC_ARG(hdr->addr2));
885 #endif /* CONFIG_MAC80211_DEBUG */
889 return TXRX_CONTINUE;
892 static ieee80211_txrx_result
893 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
896 * Pass through unencrypted frames if the hardware might have
897 * decrypted them already without telling us, but that can only
898 * be true if we either didn't find a key or the found key is
899 * uploaded to the hardware.
901 if ((rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP) &&
902 (!rx->key || !rx->key->force_sw_encrypt))
903 return TXRX_CONTINUE;
905 /* Drop unencrypted frames if key is set. */
906 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
907 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
908 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
909 (rx->key || rx->sdata->drop_unencrypted) &&
910 (rx->sdata->eapol == 0 ||
911 !ieee80211_is_eapol(rx->skb)))) {
913 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
914 "encryption\n", rx->dev->name);
917 return TXRX_CONTINUE;
920 static ieee80211_txrx_result
921 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
923 struct net_device *dev = rx->dev;
924 struct ieee80211_local *local = rx->local;
925 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
926 u16 fc, hdrlen, ethertype;
930 struct sk_buff *skb = rx->skb, *skb2;
931 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
934 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
935 return TXRX_CONTINUE;
937 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
940 hdrlen = ieee80211_get_hdrlen(fc);
942 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
944 * IEEE 802.11 address fields:
945 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
946 * 0 0 DA SA BSSID n/a
947 * 0 1 DA BSSID SA n/a
948 * 1 0 BSSID SA DA n/a
952 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
953 case IEEE80211_FCTL_TODS:
955 memcpy(dst, hdr->addr3, ETH_ALEN);
956 memcpy(src, hdr->addr2, ETH_ALEN);
958 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
959 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
961 printk(KERN_DEBUG "%s: dropped ToDS frame "
964 " DA=" MAC_FMT ")\n",
968 MAC_ARG(hdr->addr3));
972 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
974 memcpy(dst, hdr->addr3, ETH_ALEN);
975 memcpy(src, hdr->addr4, ETH_ALEN);
977 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
979 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
981 " TA=" MAC_FMT " DA=" MAC_FMT
982 " SA=" MAC_FMT ")\n",
987 MAC_ARG(hdr->addr4));
991 case IEEE80211_FCTL_FROMDS:
993 memcpy(dst, hdr->addr1, ETH_ALEN);
994 memcpy(src, hdr->addr3, ETH_ALEN);
996 if (sdata->type != IEEE80211_IF_TYPE_STA) {
1002 memcpy(dst, hdr->addr1, ETH_ALEN);
1003 memcpy(src, hdr->addr2, ETH_ALEN);
1005 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1006 if (net_ratelimit()) {
1007 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
1008 MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
1010 dev->name, MAC_ARG(hdr->addr1),
1011 MAC_ARG(hdr->addr2),
1012 MAC_ARG(hdr->addr3));
1019 payload = skb->data + hdrlen;
1021 if (unlikely(skb->len - hdrlen < 8)) {
1022 if (net_ratelimit()) {
1023 printk(KERN_DEBUG "%s: RX too short data frame "
1024 "payload\n", dev->name);
1029 ethertype = (payload[6] << 8) | payload[7];
1031 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1032 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1033 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1034 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1035 * replace EtherType */
1036 skb_pull(skb, hdrlen + 6);
1037 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1038 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1040 struct ethhdr *ehdr;
1042 skb_pull(skb, hdrlen);
1043 len = htons(skb->len);
1044 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1045 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1046 memcpy(ehdr->h_source, src, ETH_ALEN);
1047 ehdr->h_proto = len;
1053 sdata->stats.rx_packets++;
1054 sdata->stats.rx_bytes += skb->len;
1056 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1057 || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) {
1058 if (is_multicast_ether_addr(skb->data)) {
1059 /* send multicast frames both to higher layers in
1060 * local net stack and back to the wireless media */
1061 skb2 = skb_copy(skb, GFP_ATOMIC);
1062 if (!skb2 && net_ratelimit())
1063 printk(KERN_DEBUG "%s: failed to clone "
1064 "multicast frame\n", dev->name);
1066 struct sta_info *dsta;
1067 dsta = sta_info_get(local, skb->data);
1068 if (dsta && !dsta->dev) {
1069 if (net_ratelimit())
1070 printk(KERN_DEBUG "Station with null "
1071 "dev structure!\n");
1072 } else if (dsta && dsta->dev == dev) {
1073 /* Destination station is associated to this
1074 * AP, so send the frame directly to it and
1075 * do not pass the frame to local net stack.
1086 /* deliver to local stack */
1087 skb->protocol = eth_type_trans(skb, dev);
1088 memset(skb->cb, 0, sizeof(skb->cb));
1093 /* send to wireless media */
1094 skb2->protocol = __constant_htons(ETH_P_802_3);
1095 skb_set_network_header(skb2, 0);
1096 skb_set_mac_header(skb2, 0);
1097 dev_queue_xmit(skb2);
1103 static ieee80211_txrx_result
1104 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1106 struct ieee80211_sub_if_data *sdata;
1108 if (!rx->u.rx.ra_match)
1111 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1112 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1113 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1114 !rx->local->user_space_mlme) {
1115 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1117 /* Management frames are sent to hostapd for processing */
1118 if (!rx->local->apdev)
1120 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1121 ieee80211_msg_normal);
1126 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1127 struct ieee80211_local *local,
1128 ieee80211_rx_handler *handlers,
1129 struct ieee80211_txrx_data *rx,
1130 struct sta_info *sta)
1132 ieee80211_rx_handler *handler;
1133 ieee80211_txrx_result res = TXRX_DROP;
1135 for (handler = handlers; *handler != NULL; handler++) {
1136 res = (*handler)(rx);
1142 I802_DEBUG_INC(local->rx_handlers_drop);
1147 I802_DEBUG_INC(local->rx_handlers_queued);
1153 if (res == TXRX_DROP)
1154 dev_kfree_skb(rx->skb);
1158 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1159 ieee80211_rx_handler *handlers,
1160 struct ieee80211_txrx_data *rx,
1161 struct sta_info *sta)
1163 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1165 dev_kfree_skb(rx->skb);
1168 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1169 struct ieee80211_hdr *hdr,
1170 struct sta_info *sta,
1171 struct ieee80211_txrx_data *rx)
1175 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1176 if (rx->skb->len >= hdrlen + 4)
1177 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1181 /* TODO: verify that this is not triggered by fragmented
1182 * frames (hw does not verify MIC for them). */
1183 if (net_ratelimit())
1184 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1185 "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
1186 dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1),
1190 /* Some hardware versions seem to generate incorrect
1191 * Michael MIC reports; ignore them to avoid triggering
1192 * countermeasures. */
1193 if (net_ratelimit())
1194 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1195 "error for unknown address " MAC_FMT "\n",
1196 dev->name, MAC_ARG(hdr->addr2));
1200 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1201 if (net_ratelimit())
1202 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1203 "error for a frame with no ISWEP flag (src "
1204 MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
1208 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
1209 rx->sdata->type == IEEE80211_IF_TYPE_AP) {
1210 keyidx = ieee80211_wep_get_keyidx(rx->skb);
1211 /* AP with Pairwise keys support should never receive Michael
1212 * MIC errors for non-zero keyidx because these are reserved
1213 * for group keys and only the AP is sending real multicast
1216 if (net_ratelimit())
1217 printk(KERN_DEBUG "%s: ignored Michael MIC "
1218 "error for a frame with non-zero keyidx"
1219 " (%d) (src " MAC_FMT ")\n", dev->name,
1220 keyidx, MAC_ARG(hdr->addr2));
1225 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1226 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1227 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1228 if (net_ratelimit())
1229 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1230 "error for a frame that cannot be encrypted "
1231 "(fc=0x%04x) (src " MAC_FMT ")\n",
1232 dev->name, rx->fc, MAC_ARG(hdr->addr2));
1237 union iwreq_data wrqu;
1238 char *buf = kmalloc(128, GFP_ATOMIC);
1242 /* TODO: needed parameters: count, key type, TSC */
1243 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
1244 "keyid=%d %scast addr=" MAC_FMT ")",
1245 keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
1246 MAC_ARG(hdr->addr2));
1247 memset(&wrqu, 0, sizeof(wrqu));
1248 wrqu.data.length = strlen(buf);
1249 wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
1253 /* TODO: consider verifying the MIC error report with software
1254 * implementation if we get too many spurious reports from the
1256 if (!rx->local->apdev)
1258 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1259 ieee80211_msg_michael_mic_failure);
1263 dev_kfree_skb(rx->skb);
1267 ieee80211_rx_handler ieee80211_rx_handlers[] =
1269 ieee80211_rx_h_if_stats,
1270 ieee80211_rx_h_monitor,
1271 ieee80211_rx_h_passive_scan,
1272 ieee80211_rx_h_check,
1273 ieee80211_rx_h_load_key,
1274 ieee80211_rx_h_sta_process,
1275 ieee80211_rx_h_ccmp_decrypt,
1276 ieee80211_rx_h_tkip_decrypt,
1277 ieee80211_rx_h_wep_weak_iv_detection,
1278 ieee80211_rx_h_wep_decrypt,
1279 ieee80211_rx_h_defragment,
1280 ieee80211_rx_h_ps_poll,
1281 ieee80211_rx_h_michael_mic_verify,
1282 /* this must be after decryption - so header is counted in MPDU mic
1283 * must be before pae and data, so QOS_DATA format frames
1284 * are not passed to user space by these functions
1286 ieee80211_rx_h_remove_qos_control,
1287 ieee80211_rx_h_802_1x_pae,
1288 ieee80211_rx_h_drop_unencrypted,
1289 ieee80211_rx_h_data,
1290 ieee80211_rx_h_mgmt,
1294 /* main receive path */
1296 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1297 u8 *bssid, struct ieee80211_txrx_data *rx,
1298 struct ieee80211_hdr *hdr)
1300 int multicast = is_multicast_ether_addr(hdr->addr1);
1302 switch (sdata->type) {
1303 case IEEE80211_IF_TYPE_STA:
1306 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1307 if (!rx->u.rx.in_scan)
1309 rx->u.rx.ra_match = 0;
1310 } else if (!multicast &&
1311 compare_ether_addr(sdata->dev->dev_addr,
1313 if (!sdata->promisc)
1315 rx->u.rx.ra_match = 0;
1318 case IEEE80211_IF_TYPE_IBSS:
1321 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1322 if (!rx->u.rx.in_scan)
1324 rx->u.rx.ra_match = 0;
1325 } else if (!multicast &&
1326 compare_ether_addr(sdata->dev->dev_addr,
1328 if (!sdata->promisc)
1330 rx->u.rx.ra_match = 0;
1331 } else if (!rx->sta)
1332 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1335 case IEEE80211_IF_TYPE_AP:
1337 if (compare_ether_addr(sdata->dev->dev_addr,
1340 } else if (!ieee80211_bssid_match(bssid,
1341 sdata->dev->dev_addr)) {
1342 if (!rx->u.rx.in_scan)
1344 rx->u.rx.ra_match = 0;
1346 if (sdata->dev == sdata->local->mdev && !rx->u.rx.in_scan)
1347 /* do not receive anything via
1348 * master device when not scanning */
1351 case IEEE80211_IF_TYPE_WDS:
1353 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1355 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1364 * This is the receive path handler. It is called by a low level driver when an
1365 * 802.11 MPDU is received from the hardware.
1367 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1368 struct ieee80211_rx_status *status)
1370 struct ieee80211_local *local = hw_to_local(hw);
1371 struct ieee80211_sub_if_data *sdata;
1372 struct sta_info *sta;
1373 struct ieee80211_hdr *hdr;
1374 struct ieee80211_txrx_data rx;
1376 int radiotap_len = 0, prepres;
1377 struct ieee80211_sub_if_data *prev = NULL;
1378 struct sk_buff *skb_new;
1381 if (status->flag & RX_FLAG_RADIOTAP) {
1382 radiotap_len = ieee80211_get_radiotap_len(skb->data);
1383 skb_pull(skb, radiotap_len);
1386 hdr = (struct ieee80211_hdr *) skb->data;
1387 memset(&rx, 0, sizeof(rx));
1391 rx.u.rx.status = status;
1392 rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
1393 type = rx.fc & IEEE80211_FCTL_FTYPE;
1394 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1395 local->dot11ReceivedFragmentCount++;
1397 if (skb->len >= 16) {
1398 sta = rx.sta = sta_info_get(local, hdr->addr2);
1400 rx.dev = rx.sta->dev;
1401 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1404 sta = rx.sta = NULL;
1406 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1407 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1411 if (unlikely(local->sta_scanning))
1412 rx.u.rx.in_scan = 1;
1414 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1415 sta) != TXRX_CONTINUE)
1419 skb_push(skb, radiotap_len);
1420 if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
1421 !local->iff_promiscs && !is_multicast_ether_addr(hdr->addr1)) {
1422 rx.u.rx.ra_match = 1;
1423 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1429 bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
1431 read_lock(&local->sub_if_lock);
1432 list_for_each_entry(sdata, &local->sub_if_list, list) {
1433 rx.u.rx.ra_match = 1;
1435 if (!netif_running(sdata->dev))
1438 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1439 /* prepare_for_handlers can change sta */
1446 * frame is destined for this interface, but if it's not
1447 * also for the previous one we handle that after the
1448 * loop to avoid copying the SKB once too much
1457 * frame was destined for the previous interface
1458 * so invoke RX handlers for it
1461 skb_new = skb_copy(skb, GFP_ATOMIC);
1463 if (net_ratelimit())
1464 printk(KERN_DEBUG "%s: failed to copy "
1465 "multicast frame for %s",
1466 local->mdev->name, prev->dev->name);
1472 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1480 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1484 read_unlock(&local->sub_if_lock);
1490 EXPORT_SYMBOL(__ieee80211_rx);
1492 /* This is a version of the rx handler that can be called from hard irq
1493 * context. Post the skb on the queue and schedule the tasklet */
1494 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1495 struct ieee80211_rx_status *status)
1497 struct ieee80211_local *local = hw_to_local(hw);
1499 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1501 skb->dev = local->mdev;
1502 /* copy status into skb->cb for use by tasklet */
1503 memcpy(skb->cb, status, sizeof(*status));
1504 skb->pkt_type = IEEE80211_RX_MSG;
1505 skb_queue_tail(&local->skb_queue, skb);
1506 tasklet_schedule(&local->tasklet);
1508 EXPORT_SYMBOL(ieee80211_rx_irqsafe);