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/mac80211.h>
17 #include <net/ieee80211_radiotap.h>
19 #include "ieee80211_i.h"
20 #include "ieee80211_led.h"
21 #include "ieee80211_common.h"
29 * these don't have dev/sdata fields in the rx data
30 * The sta value should also not be used because it may
31 * be NULL even though a STA (in IBSS mode) will be added.
34 static ieee80211_txrx_result
35 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
37 u8 *data = rx->skb->data;
40 /* does the frame have a qos control field? */
41 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
42 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
43 /* frame has qos control */
44 tid = qc[0] & QOS_CONTROL_TID_MASK;
46 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
47 /* Separate TID for management frames */
48 tid = NUM_RX_DATA_QUEUES - 1;
50 /* no qos control present */
51 tid = 0; /* 802.1d - Best Effort */
55 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
56 /* only a debug counter, sta might not be assigned properly yet */
58 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
61 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
62 * For now, set skb->priority to 0 for other cases. */
63 rx->skb->priority = (tid > 7) ? 0 : tid;
68 static ieee80211_txrx_result
69 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
71 struct ieee80211_local *local = rx->local;
72 struct sk_buff *skb = rx->skb;
73 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
74 u32 load = 0, hdrtime;
75 struct ieee80211_rate *rate;
76 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
79 /* Estimate total channel use caused by this frame */
81 if (unlikely(mode->num_rates < 0))
84 rate = &mode->rates[0];
85 for (i = 0; i < mode->num_rates; i++) {
86 if (mode->rates[i].val == rx->u.rx.status->rate) {
87 rate = &mode->rates[i];
92 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
93 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
95 if (mode->mode == MODE_IEEE80211A ||
96 mode->mode == MODE_ATHEROS_TURBO ||
97 mode->mode == MODE_ATHEROS_TURBOG ||
98 (mode->mode == MODE_IEEE80211G &&
99 rate->flags & IEEE80211_RATE_ERP))
100 hdrtime = CHAN_UTIL_HDR_SHORT;
102 hdrtime = CHAN_UTIL_HDR_LONG;
105 if (!is_multicast_ether_addr(hdr->addr1))
108 load += skb->len * rate->rate_inv;
110 /* Divide channel_use by 8 to avoid wrapping around the counter */
111 load >>= CHAN_UTIL_SHIFT;
112 local->channel_use_raw += load;
113 rx->u.rx.load = load;
115 return TXRX_CONTINUE;
118 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
120 ieee80211_rx_h_parse_qos,
121 ieee80211_rx_h_load_stats,
127 static ieee80211_txrx_result
128 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
131 rx->sta->channel_use_raw += rx->u.rx.load;
132 rx->sdata->channel_use_raw += rx->u.rx.load;
133 return TXRX_CONTINUE;
137 ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
138 struct ieee80211_rx_status *status)
140 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
141 struct ieee80211_sub_if_data *sdata;
142 struct ieee80211_rate *rate;
143 struct ieee80211_rtap_hdr {
144 struct ieee80211_radiotap_header hdr;
150 } __attribute__ ((packed)) *rthdr;
154 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
156 if (status->flag & RX_FLAG_RADIOTAP)
159 if (skb_headroom(skb) < sizeof(*rthdr)) {
160 I802_DEBUG_INC(local->rx_expand_skb_head);
161 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
167 rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
168 memset(rthdr, 0, sizeof(*rthdr));
169 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
170 rthdr->hdr.it_present =
171 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
172 (1 << IEEE80211_RADIOTAP_RATE) |
173 (1 << IEEE80211_RADIOTAP_CHANNEL) |
174 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
175 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
176 IEEE80211_RADIOTAP_F_FCS : 0;
177 rate = ieee80211_get_rate(local, status->phymode, status->rate);
179 rthdr->rate = rate->rate / 5;
180 rthdr->chan_freq = cpu_to_le16(status->freq);
182 status->phymode == MODE_IEEE80211A ?
183 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
184 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
185 rthdr->antsignal = status->ssi;
188 sdata->stats.rx_packets++;
189 sdata->stats.rx_bytes += skb->len;
191 skb_set_mac_header(skb, 0);
192 skb->ip_summed = CHECKSUM_UNNECESSARY;
193 skb->pkt_type = PACKET_OTHERHOST;
194 skb->protocol = htons(ETH_P_802_2);
195 memset(skb->cb, 0, sizeof(skb->cb));
199 static ieee80211_txrx_result
200 ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
202 if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
203 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
207 if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
208 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb->data));
210 return TXRX_CONTINUE;
213 static ieee80211_txrx_result
214 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
216 struct ieee80211_local *local = rx->local;
217 struct sk_buff *skb = rx->skb;
219 if (unlikely(local->sta_scanning != 0)) {
220 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
224 if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
225 /* scanning finished during invoking of handlers */
226 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
230 return TXRX_CONTINUE;
233 static ieee80211_txrx_result
234 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
236 struct ieee80211_hdr *hdr;
237 hdr = (struct ieee80211_hdr *) rx->skb->data;
239 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
240 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
241 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
242 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
244 if (rx->flags & IEEE80211_TXRXD_RXRA_MATCH) {
245 rx->local->dot11FrameDuplicateCount++;
246 rx->sta->num_duplicates++;
250 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
253 if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
254 rx->skb->len > FCS_LEN)
255 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
257 if (unlikely(rx->skb->len < 16)) {
258 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
262 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
263 rx->skb->pkt_type = PACKET_OTHERHOST;
264 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
265 rx->skb->pkt_type = PACKET_HOST;
266 else if (is_multicast_ether_addr(hdr->addr1)) {
267 if (is_broadcast_ether_addr(hdr->addr1))
268 rx->skb->pkt_type = PACKET_BROADCAST;
270 rx->skb->pkt_type = PACKET_MULTICAST;
272 rx->skb->pkt_type = PACKET_OTHERHOST;
274 /* Drop disallowed frame classes based on STA auth/assoc state;
275 * IEEE 802.11, Chap 5.5.
277 * 80211.o does filtering only based on association state, i.e., it
278 * drops Class 3 frames from not associated stations. hostapd sends
279 * deauth/disassoc frames when needed. In addition, hostapd is
280 * responsible for filtering on both auth and assoc states.
282 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
283 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
284 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
285 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
286 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
287 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
288 !(rx->fc & IEEE80211_FCTL_TODS) &&
289 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
290 || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
291 /* Drop IBSS frames and frames for other hosts
296 if (!rx->local->apdev)
299 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
300 ieee80211_msg_sta_not_assoc);
304 return TXRX_CONTINUE;
308 static ieee80211_txrx_result
309 ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
311 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
318 * There are three types of keys:
320 * - PTK (pairwise keys)
321 * - STK (station-to-station pairwise keys)
323 * When selecting a key, we have to distinguish between multicast
324 * (including broadcast) and unicast frames, the latter can only
325 * use PTKs and STKs while the former always use GTKs. Unless, of
326 * course, actual WEP keys ("pre-RSNA") are used, then unicast
327 * frames can also use key indizes like GTKs. Hence, if we don't
328 * have a PTK/STK we check the key index for a WEP key.
330 * There is also a slight problem in IBSS mode: GTKs are negotiated
331 * with each station, that is something we don't currently handle.
334 if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
335 return TXRX_CONTINUE;
338 * No point in finding a key if the frame is neither
339 * addressed to us nor a multicast frame.
341 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
342 return TXRX_CONTINUE;
344 if (!is_multicast_ether_addr(hdr->addr1) && rx->sta && rx->sta->key) {
345 rx->key = rx->sta->key;
348 * The device doesn't give us the IV so we won't be
349 * able to look up the key. That's ok though, we
350 * don't need to decrypt the frame, we just won't
351 * be able to keep statistics accurate.
352 * Except for key threshold notifications, should
353 * we somehow allow the driver to tell us which key
354 * the hardware used if this flag is set?
356 if (!(rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV))
357 return TXRX_CONTINUE;
359 hdrlen = ieee80211_get_hdrlen(rx->fc);
361 if (rx->skb->len < 8 + hdrlen)
362 return TXRX_DROP; /* TODO: count this? */
365 * no need to call ieee80211_wep_get_keyidx,
366 * it verifies a bunch of things we've done already
368 keyidx = rx->skb->data[hdrlen + 3] >> 6;
370 rx->key = rx->sdata->keys[keyidx];
373 * RSNA-protected unicast frames should always be sent with
374 * pairwise or station-to-station keys, but for WEP we allow
375 * using a key index as well.
377 if (rx->key && rx->key->conf.alg != ALG_WEP &&
378 !is_multicast_ether_addr(hdr->addr1))
383 rx->key->tx_rx_count++;
384 if (unlikely(rx->local->key_tx_rx_threshold &&
385 rx->key->tx_rx_count >
386 rx->local->key_tx_rx_threshold)) {
387 ieee80211_key_threshold_notify(rx->dev, rx->key,
392 return TXRX_CONTINUE;
395 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
397 struct ieee80211_sub_if_data *sdata;
398 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
401 atomic_inc(&sdata->bss->num_sta_ps);
402 sta->flags |= WLAN_STA_PS;
404 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
405 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
406 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
407 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
410 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
412 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
415 struct ieee80211_sub_if_data *sdata;
416 struct ieee80211_tx_packet_data *pkt_data;
418 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
420 atomic_dec(&sdata->bss->num_sta_ps);
421 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
423 if (!skb_queue_empty(&sta->ps_tx_buf)) {
424 if (local->ops->set_tim)
425 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
427 bss_tim_clear(local, sdata->bss, sta->aid);
429 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
430 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
431 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
432 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
433 /* Send all buffered frames to the station */
434 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
435 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
437 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
440 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
441 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
442 local->total_ps_buffered--;
444 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
445 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
446 "since STA not sleeping anymore\n", dev->name,
447 MAC_ARG(sta->addr), sta->aid);
448 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
449 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
456 static ieee80211_txrx_result
457 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
459 struct sta_info *sta = rx->sta;
460 struct net_device *dev = rx->dev;
461 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
464 return TXRX_CONTINUE;
466 /* Update last_rx only for IBSS packets which are for the current
467 * BSSID to avoid keeping the current IBSS network alive in cases where
468 * other STAs are using different BSSID. */
469 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
470 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
471 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
472 sta->last_rx = jiffies;
474 if (!is_multicast_ether_addr(hdr->addr1) ||
475 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
476 /* Update last_rx only for unicast frames in order to prevent
477 * the Probe Request frames (the only broadcast frames from a
478 * STA in infrastructure mode) from keeping a connection alive.
480 sta->last_rx = jiffies;
483 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
484 return TXRX_CONTINUE;
487 sta->rx_bytes += rx->skb->len;
488 sta->last_rssi = rx->u.rx.status->ssi;
489 sta->last_signal = rx->u.rx.status->signal;
490 sta->last_noise = rx->u.rx.status->noise;
492 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
493 /* Change STA power saving mode only in the end of a frame
494 * exchange sequence */
495 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
496 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
497 else if (!(sta->flags & WLAN_STA_PS) &&
498 (rx->fc & IEEE80211_FCTL_PM))
499 ap_sta_ps_start(dev, sta);
502 /* Drop data::nullfunc frames silently, since they are used only to
503 * control station power saving mode. */
504 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
505 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
506 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
507 /* Update counter and free packet here to avoid counting this
508 * as a dropped packed. */
510 dev_kfree_skb(rx->skb);
514 return TXRX_CONTINUE;
515 } /* ieee80211_rx_h_sta_process */
517 static ieee80211_txrx_result
518 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
520 if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
521 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
522 !rx->key || rx->key->conf.alg != ALG_WEP ||
523 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
524 return TXRX_CONTINUE;
526 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
527 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
528 !(rx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
529 if (ieee80211_wep_is_weak_iv(rx->skb, rx->key))
530 rx->sta->wep_weak_iv_count++;
532 return TXRX_CONTINUE;
535 static ieee80211_txrx_result
536 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
538 if ((rx->key && rx->key->conf.alg != ALG_WEP) ||
539 !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
540 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
541 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
542 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
543 return TXRX_CONTINUE;
547 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
552 if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
553 !(rx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
554 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
556 printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
557 "failed\n", rx->dev->name);
560 } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
561 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
563 skb_trim(rx->skb, rx->skb->len - 4);
566 return TXRX_CONTINUE;
569 static inline struct ieee80211_fragment_entry *
570 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
571 unsigned int frag, unsigned int seq, int rx_queue,
572 struct sk_buff **skb)
574 struct ieee80211_fragment_entry *entry;
577 idx = sdata->fragment_next;
578 entry = &sdata->fragments[sdata->fragment_next++];
579 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
580 sdata->fragment_next = 0;
582 if (!skb_queue_empty(&entry->skb_list)) {
583 #ifdef CONFIG_MAC80211_DEBUG
584 struct ieee80211_hdr *hdr =
585 (struct ieee80211_hdr *) entry->skb_list.next->data;
586 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
587 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
588 "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
589 sdata->dev->name, idx,
590 jiffies - entry->first_frag_time, entry->seq,
591 entry->last_frag, MAC_ARG(hdr->addr1),
592 MAC_ARG(hdr->addr2));
593 #endif /* CONFIG_MAC80211_DEBUG */
594 __skb_queue_purge(&entry->skb_list);
597 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
599 entry->first_frag_time = jiffies;
601 entry->rx_queue = rx_queue;
602 entry->last_frag = frag;
604 entry->extra_len = 0;
609 static inline struct ieee80211_fragment_entry *
610 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
611 u16 fc, unsigned int frag, unsigned int seq,
612 int rx_queue, struct ieee80211_hdr *hdr)
614 struct ieee80211_fragment_entry *entry;
617 idx = sdata->fragment_next;
618 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
619 struct ieee80211_hdr *f_hdr;
624 idx = IEEE80211_FRAGMENT_MAX - 1;
626 entry = &sdata->fragments[idx];
627 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
628 entry->rx_queue != rx_queue ||
629 entry->last_frag + 1 != frag)
632 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
633 f_fc = le16_to_cpu(f_hdr->frame_control);
635 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
636 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
637 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
640 if (entry->first_frag_time + 2 * HZ < jiffies) {
641 __skb_queue_purge(&entry->skb_list);
650 static ieee80211_txrx_result
651 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
653 struct ieee80211_hdr *hdr;
655 unsigned int frag, seq;
656 struct ieee80211_fragment_entry *entry;
659 hdr = (struct ieee80211_hdr *) rx->skb->data;
660 sc = le16_to_cpu(hdr->seq_ctrl);
661 frag = sc & IEEE80211_SCTL_FRAG;
663 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
664 (rx->skb)->len < 24 ||
665 is_multicast_ether_addr(hdr->addr1))) {
669 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
671 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
674 /* This is the first fragment of a new frame. */
675 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
676 rx->u.rx.queue, &(rx->skb));
677 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
678 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
679 /* Store CCMP PN so that we can verify that the next
680 * fragment has a sequential PN value. */
682 memcpy(entry->last_pn,
683 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
689 /* This is a fragment for a frame that should already be pending in
690 * fragment cache. Add this fragment to the end of the pending entry.
692 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
693 rx->u.rx.queue, hdr);
695 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
699 /* Verify that MPDUs within one MSDU have sequential PN values.
700 * (IEEE 802.11i, 8.3.3.4.5) */
703 u8 pn[CCMP_PN_LEN], *rpn;
704 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
706 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
707 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
712 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
713 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
715 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
716 "sequential A2=" MAC_FMT
717 " PN=%02x%02x%02x%02x%02x%02x "
718 "(expected %02x%02x%02x%02x%02x%02x)\n",
719 rx->dev->name, MAC_ARG(hdr->addr2),
720 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
721 rpn[5], pn[0], pn[1], pn[2], pn[3],
725 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
728 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
729 __skb_queue_tail(&entry->skb_list, rx->skb);
730 entry->last_frag = frag;
731 entry->extra_len += rx->skb->len;
732 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
737 rx->skb = __skb_dequeue(&entry->skb_list);
738 if (skb_tailroom(rx->skb) < entry->extra_len) {
739 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
740 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
742 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
743 __skb_queue_purge(&entry->skb_list);
747 while ((skb = __skb_dequeue(&entry->skb_list))) {
748 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
752 /* Complete frame has been reassembled - process it now */
753 rx->flags |= IEEE80211_TXRXD_FRAGMENTED;
757 rx->sta->rx_packets++;
758 if (is_multicast_ether_addr(hdr->addr1))
759 rx->local->dot11MulticastReceivedFrameCount++;
761 ieee80211_led_rx(rx->local);
762 return TXRX_CONTINUE;
765 static ieee80211_txrx_result
766 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
771 if (likely(!rx->sta ||
772 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
773 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
774 !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
775 return TXRX_CONTINUE;
777 skb = skb_dequeue(&rx->sta->tx_filtered);
779 skb = skb_dequeue(&rx->sta->ps_tx_buf);
781 rx->local->total_ps_buffered--;
783 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
784 skb_queue_empty(&rx->sta->ps_tx_buf);
787 struct ieee80211_hdr *hdr =
788 (struct ieee80211_hdr *) skb->data;
790 /* tell TX path to send one frame even though the STA may
791 * still remain is PS mode after this frame exchange */
794 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
795 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
797 MAC_ARG(rx->sta->addr), rx->sta->aid,
798 skb_queue_len(&rx->sta->ps_tx_buf));
799 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
801 /* Use MoreData flag to indicate whether there are more
802 * buffered frames for this STA */
803 if (no_pending_pkts) {
804 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
805 rx->sta->flags &= ~WLAN_STA_TIM;
807 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
811 if (no_pending_pkts) {
812 if (rx->local->ops->set_tim)
813 rx->local->ops->set_tim(local_to_hw(rx->local),
816 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
818 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
819 } else if (!rx->u.rx.sent_ps_buffered) {
820 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
821 "though there is no buffered frames for it\n",
822 rx->dev->name, MAC_ARG(rx->sta->addr));
823 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
827 /* Free PS Poll skb here instead of returning TXRX_DROP that would
828 * count as an dropped frame. */
829 dev_kfree_skb(rx->skb);
834 static ieee80211_txrx_result
835 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
838 u8 *data = rx->skb->data;
839 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
841 if (!WLAN_FC_IS_QOS_DATA(fc))
842 return TXRX_CONTINUE;
844 /* remove the qos control field, update frame type and meta-data */
845 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
846 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
847 /* change frame type to non QOS */
848 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
849 hdr->frame_control = cpu_to_le16(fc);
851 return TXRX_CONTINUE;
854 static ieee80211_txrx_result
855 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
857 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
858 rx->sdata->type != IEEE80211_IF_TYPE_STA &&
859 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
860 /* Pass both encrypted and unencrypted EAPOL frames to user
861 * space for processing. */
862 if (!rx->local->apdev)
864 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
865 ieee80211_msg_normal);
869 if (unlikely(rx->sdata->ieee802_1x &&
870 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
871 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
872 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
873 !ieee80211_is_eapol(rx->skb))) {
874 #ifdef CONFIG_MAC80211_DEBUG
875 struct ieee80211_hdr *hdr =
876 (struct ieee80211_hdr *) rx->skb->data;
877 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
878 " (unauthorized port)\n", rx->dev->name,
879 MAC_ARG(hdr->addr2));
880 #endif /* CONFIG_MAC80211_DEBUG */
884 return TXRX_CONTINUE;
887 static ieee80211_txrx_result
888 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
891 * Pass through unencrypted frames if the hardware might have
892 * decrypted them already without telling us, but that can only
893 * be true if we either didn't find a key or the found key is
894 * uploaded to the hardware.
896 if ((rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP) &&
897 (!rx->key || (rx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)))
898 return TXRX_CONTINUE;
900 /* Drop unencrypted frames if key is set. */
901 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
902 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
903 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
904 (rx->key || rx->sdata->drop_unencrypted) &&
905 (rx->sdata->eapol == 0 ||
906 !ieee80211_is_eapol(rx->skb)))) {
908 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
909 "encryption\n", rx->dev->name);
912 return TXRX_CONTINUE;
915 static ieee80211_txrx_result
916 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
918 struct net_device *dev = rx->dev;
919 struct ieee80211_local *local = rx->local;
920 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
921 u16 fc, hdrlen, ethertype;
925 struct sk_buff *skb = rx->skb, *skb2;
926 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
929 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
930 return TXRX_CONTINUE;
932 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
935 hdrlen = ieee80211_get_hdrlen(fc);
937 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
939 * IEEE 802.11 address fields:
940 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
941 * 0 0 DA SA BSSID n/a
942 * 0 1 DA BSSID SA n/a
943 * 1 0 BSSID SA DA n/a
947 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
948 case IEEE80211_FCTL_TODS:
950 memcpy(dst, hdr->addr3, ETH_ALEN);
951 memcpy(src, hdr->addr2, ETH_ALEN);
953 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
954 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
956 printk(KERN_DEBUG "%s: dropped ToDS frame "
959 " DA=" MAC_FMT ")\n",
963 MAC_ARG(hdr->addr3));
967 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
969 memcpy(dst, hdr->addr3, ETH_ALEN);
970 memcpy(src, hdr->addr4, ETH_ALEN);
972 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
974 printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
976 " TA=" MAC_FMT " DA=" MAC_FMT
977 " SA=" MAC_FMT ")\n",
982 MAC_ARG(hdr->addr4));
986 case IEEE80211_FCTL_FROMDS:
988 memcpy(dst, hdr->addr1, ETH_ALEN);
989 memcpy(src, hdr->addr3, ETH_ALEN);
991 if (sdata->type != IEEE80211_IF_TYPE_STA ||
992 (is_multicast_ether_addr(dst) &&
993 !compare_ether_addr(src, dev->dev_addr)))
998 memcpy(dst, hdr->addr1, ETH_ALEN);
999 memcpy(src, hdr->addr2, ETH_ALEN);
1001 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
1002 if (net_ratelimit()) {
1003 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
1004 MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
1006 dev->name, MAC_ARG(hdr->addr1),
1007 MAC_ARG(hdr->addr2),
1008 MAC_ARG(hdr->addr3));
1015 payload = skb->data + hdrlen;
1017 if (unlikely(skb->len - hdrlen < 8)) {
1018 if (net_ratelimit()) {
1019 printk(KERN_DEBUG "%s: RX too short data frame "
1020 "payload\n", dev->name);
1025 ethertype = (payload[6] << 8) | payload[7];
1027 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1028 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1029 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1030 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1031 * replace EtherType */
1032 skb_pull(skb, hdrlen + 6);
1033 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1034 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1036 struct ethhdr *ehdr;
1038 skb_pull(skb, hdrlen);
1039 len = htons(skb->len);
1040 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1041 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1042 memcpy(ehdr->h_source, src, ETH_ALEN);
1043 ehdr->h_proto = len;
1049 sdata->stats.rx_packets++;
1050 sdata->stats.rx_bytes += skb->len;
1052 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
1053 || sdata->type == IEEE80211_IF_TYPE_VLAN) &&
1054 (rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
1055 if (is_multicast_ether_addr(skb->data)) {
1056 /* send multicast frames both to higher layers in
1057 * local net stack and back to the wireless media */
1058 skb2 = skb_copy(skb, GFP_ATOMIC);
1059 if (!skb2 && net_ratelimit())
1060 printk(KERN_DEBUG "%s: failed to clone "
1061 "multicast frame\n", dev->name);
1063 struct sta_info *dsta;
1064 dsta = sta_info_get(local, skb->data);
1065 if (dsta && !dsta->dev) {
1066 if (net_ratelimit())
1067 printk(KERN_DEBUG "Station with null "
1068 "dev structure!\n");
1069 } else if (dsta && dsta->dev == dev) {
1070 /* Destination station is associated to this
1071 * AP, so send the frame directly to it and
1072 * do not pass the frame to local net stack.
1083 /* deliver to local stack */
1084 skb->protocol = eth_type_trans(skb, dev);
1085 memset(skb->cb, 0, sizeof(skb->cb));
1090 /* send to wireless media */
1091 skb2->protocol = __constant_htons(ETH_P_802_3);
1092 skb_set_network_header(skb2, 0);
1093 skb_set_mac_header(skb2, 0);
1094 dev_queue_xmit(skb2);
1100 static ieee80211_txrx_result
1101 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
1103 struct ieee80211_sub_if_data *sdata;
1105 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
1108 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1109 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
1110 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
1111 !rx->local->user_space_mlme) {
1112 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
1114 /* Management frames are sent to hostapd for processing */
1115 if (!rx->local->apdev)
1117 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
1118 ieee80211_msg_normal);
1123 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
1124 struct ieee80211_local *local,
1125 ieee80211_rx_handler *handlers,
1126 struct ieee80211_txrx_data *rx,
1127 struct sta_info *sta)
1129 ieee80211_rx_handler *handler;
1130 ieee80211_txrx_result res = TXRX_DROP;
1132 for (handler = handlers; *handler != NULL; handler++) {
1133 res = (*handler)(rx);
1139 I802_DEBUG_INC(local->rx_handlers_drop);
1144 I802_DEBUG_INC(local->rx_handlers_queued);
1150 if (res == TXRX_DROP)
1151 dev_kfree_skb(rx->skb);
1155 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
1156 ieee80211_rx_handler *handlers,
1157 struct ieee80211_txrx_data *rx,
1158 struct sta_info *sta)
1160 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
1162 dev_kfree_skb(rx->skb);
1165 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1166 struct ieee80211_hdr *hdr,
1167 struct sta_info *sta,
1168 struct ieee80211_txrx_data *rx)
1172 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1173 if (rx->skb->len >= hdrlen + 4)
1174 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1178 /* TODO: verify that this is not triggered by fragmented
1179 * frames (hw does not verify MIC for them). */
1180 if (net_ratelimit())
1181 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1182 "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
1183 dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1),
1187 /* Some hardware versions seem to generate incorrect
1188 * Michael MIC reports; ignore them to avoid triggering
1189 * countermeasures. */
1190 if (net_ratelimit())
1191 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1192 "error for unknown address " MAC_FMT "\n",
1193 dev->name, MAC_ARG(hdr->addr2));
1197 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1198 if (net_ratelimit())
1199 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1200 "error for a frame with no ISWEP flag (src "
1201 MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
1205 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
1206 rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
1207 /* AP with Pairwise keys support should never receive Michael
1208 * MIC errors for non-zero keyidx because these are reserved
1209 * for group keys and only the AP is sending real multicast
1211 if (net_ratelimit())
1212 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1213 "a frame with non-zero keyidx (%d)"
1214 " (src " MAC_FMT ")\n", dev->name, keyidx,
1215 MAC_ARG(hdr->addr2));
1219 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1220 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1221 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1222 if (net_ratelimit())
1223 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1224 "error for a frame that cannot be encrypted "
1225 "(fc=0x%04x) (src " MAC_FMT ")\n",
1226 dev->name, rx->fc, MAC_ARG(hdr->addr2));
1230 /* TODO: consider verifying the MIC error report with software
1231 * implementation if we get too many spurious reports from the
1234 mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1236 dev_kfree_skb(rx->skb);
1240 ieee80211_rx_handler ieee80211_rx_handlers[] =
1242 ieee80211_rx_h_if_stats,
1243 ieee80211_rx_h_monitor,
1244 ieee80211_rx_h_passive_scan,
1245 ieee80211_rx_h_check,
1246 ieee80211_rx_h_load_key,
1247 ieee80211_rx_h_sta_process,
1248 ieee80211_rx_h_ccmp_decrypt,
1249 ieee80211_rx_h_tkip_decrypt,
1250 ieee80211_rx_h_wep_weak_iv_detection,
1251 ieee80211_rx_h_wep_decrypt,
1252 ieee80211_rx_h_defragment,
1253 ieee80211_rx_h_ps_poll,
1254 ieee80211_rx_h_michael_mic_verify,
1255 /* this must be after decryption - so header is counted in MPDU mic
1256 * must be before pae and data, so QOS_DATA format frames
1257 * are not passed to user space by these functions
1259 ieee80211_rx_h_remove_qos_control,
1260 ieee80211_rx_h_802_1x_pae,
1261 ieee80211_rx_h_drop_unencrypted,
1262 ieee80211_rx_h_data,
1263 ieee80211_rx_h_mgmt,
1267 /* main receive path */
1269 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1270 u8 *bssid, struct ieee80211_txrx_data *rx,
1271 struct ieee80211_hdr *hdr)
1273 int multicast = is_multicast_ether_addr(hdr->addr1);
1275 switch (sdata->type) {
1276 case IEEE80211_IF_TYPE_STA:
1279 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1280 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1282 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1283 } else if (!multicast &&
1284 compare_ether_addr(sdata->dev->dev_addr,
1286 if (!(sdata->flags & IEEE80211_SDATA_PROMISC))
1288 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1291 case IEEE80211_IF_TYPE_IBSS:
1294 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1295 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1297 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1298 } else if (!multicast &&
1299 compare_ether_addr(sdata->dev->dev_addr,
1301 if (!(sdata->flags & IEEE80211_SDATA_PROMISC))
1303 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1304 } else if (!rx->sta)
1305 rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1308 case IEEE80211_IF_TYPE_AP:
1310 if (compare_ether_addr(sdata->dev->dev_addr,
1313 } else if (!ieee80211_bssid_match(bssid,
1314 sdata->dev->dev_addr)) {
1315 if (!(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1317 rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
1319 if (sdata->dev == sdata->local->mdev &&
1320 !(rx->flags & IEEE80211_TXRXD_RXIN_SCAN))
1321 /* do not receive anything via
1322 * master device when not scanning */
1325 case IEEE80211_IF_TYPE_WDS:
1327 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1329 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1338 * This is the receive path handler. It is called by a low level driver when an
1339 * 802.11 MPDU is received from the hardware.
1341 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1342 struct ieee80211_rx_status *status)
1344 struct ieee80211_local *local = hw_to_local(hw);
1345 struct ieee80211_sub_if_data *sdata;
1346 struct sta_info *sta;
1347 struct ieee80211_hdr *hdr;
1348 struct ieee80211_txrx_data rx;
1350 int radiotap_len = 0, prepres;
1351 struct ieee80211_sub_if_data *prev = NULL;
1352 struct sk_buff *skb_new;
1355 if (status->flag & RX_FLAG_RADIOTAP) {
1356 radiotap_len = ieee80211_get_radiotap_len(skb->data);
1357 skb_pull(skb, radiotap_len);
1360 hdr = (struct ieee80211_hdr *) skb->data;
1361 memset(&rx, 0, sizeof(rx));
1365 rx.u.rx.status = status;
1366 rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
1367 type = rx.fc & IEEE80211_FCTL_FTYPE;
1368 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1369 local->dot11ReceivedFragmentCount++;
1371 if (skb->len >= 16) {
1372 sta = rx.sta = sta_info_get(local, hdr->addr2);
1374 rx.dev = rx.sta->dev;
1375 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
1378 sta = rx.sta = NULL;
1380 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1381 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
1385 if (unlikely(local->sta_scanning))
1386 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
1388 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
1389 sta) != TXRX_CONTINUE)
1393 skb_push(skb, radiotap_len);
1394 if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
1395 !local->iff_promiscs && !is_multicast_ether_addr(hdr->addr1)) {
1396 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1397 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
1403 bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
1405 read_lock(&local->sub_if_lock);
1406 list_for_each_entry(sdata, &local->sub_if_list, list) {
1407 rx.flags |= IEEE80211_TXRXD_RXRA_MATCH;
1409 if (!netif_running(sdata->dev))
1412 prepres = prepare_for_handlers(sdata, bssid, &rx, hdr);
1413 /* prepare_for_handlers can change sta */
1420 * frame is destined for this interface, but if it's not
1421 * also for the previous one we handle that after the
1422 * loop to avoid copying the SKB once too much
1431 * frame was destined for the previous interface
1432 * so invoke RX handlers for it
1435 skb_new = skb_copy(skb, GFP_ATOMIC);
1437 if (net_ratelimit())
1438 printk(KERN_DEBUG "%s: failed to copy "
1439 "multicast frame for %s",
1440 local->mdev->name, prev->dev->name);
1446 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1454 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
1458 read_unlock(&local->sub_if_lock);
1464 EXPORT_SYMBOL(__ieee80211_rx);
1466 /* This is a version of the rx handler that can be called from hard irq
1467 * context. Post the skb on the queue and schedule the tasklet */
1468 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
1469 struct ieee80211_rx_status *status)
1471 struct ieee80211_local *local = hw_to_local(hw);
1473 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
1475 skb->dev = local->mdev;
1476 /* copy status into skb->cb for use by tasklet */
1477 memcpy(skb->cb, status, sizeof(*status));
1478 skb->pkt_type = IEEE80211_RX_MSG;
1479 skb_queue_tail(&local->skb_queue, skb);
1480 tasklet_schedule(&local->tasklet);
1482 EXPORT_SYMBOL(ieee80211_rx_irqsafe);