2
* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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#include <linux/jiffies.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/rcupdate.h>
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#include <linux/export.h>
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#include <net/mac80211.h>
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#include <net/ieee80211_radiotap.h>
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#include <asm/unaligned.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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* monitor mode reception
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* This function cleans up the SKB, i.e. it removes all the stuff
38
* only useful for monitoring.
40
static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
43
if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
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if (likely(skb->len > FCS_LEN))
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__pskb_trim(skb, skb->len - FCS_LEN);
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static inline int should_drop_frame(struct sk_buff *skb,
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struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
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if (unlikely(skb->len < 16 + present_fcs_len))
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if (ieee80211_is_ctl(hdr->frame_control) &&
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!ieee80211_is_pspoll(hdr->frame_control) &&
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!ieee80211_is_back_req(hdr->frame_control))
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ieee80211_rx_radiotap_len(struct ieee80211_local *local,
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struct ieee80211_rx_status *status)
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/* always present fields */
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len = sizeof(struct ieee80211_radiotap_header) + 9;
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if (status->flag & RX_FLAG_MACTIME_MPDU)
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if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
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if (len & 1) /* padding for RX_FLAGS if necessary */
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if (status->flag & RX_FLAG_HT) /* HT info */
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* ieee80211_add_rx_radiotap_header - add radiotap header
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* add a radiotap header containing all the fields which the hardware provided.
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ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
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struct ieee80211_rate *rate,
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int rtap_len, bool has_fcs)
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struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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struct ieee80211_radiotap_header *rthdr;
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rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
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memset(rthdr, 0, rtap_len);
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/* radiotap header, set always present flags */
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cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
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(1 << IEEE80211_RADIOTAP_CHANNEL) |
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(1 << IEEE80211_RADIOTAP_ANTENNA) |
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(1 << IEEE80211_RADIOTAP_RX_FLAGS));
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rthdr->it_len = cpu_to_le16(rtap_len);
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pos = (unsigned char *)(rthdr+1);
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/* the order of the following fields is important */
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/* IEEE80211_RADIOTAP_TSFT */
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if (status->flag & RX_FLAG_MACTIME_MPDU) {
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put_unaligned_le64(status->mactime, pos);
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cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
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/* IEEE80211_RADIOTAP_FLAGS */
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if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
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*pos |= IEEE80211_RADIOTAP_F_FCS;
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if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
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*pos |= IEEE80211_RADIOTAP_F_BADFCS;
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if (status->flag & RX_FLAG_SHORTPRE)
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*pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
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/* IEEE80211_RADIOTAP_RATE */
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if (!rate || status->flag & RX_FLAG_HT) {
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* Without rate information don't add it. If we have,
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* MCS information is a separate field in radiotap,
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* added below. The byte here is needed as padding
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* for the channel though, so initialise it to 0.
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rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
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*pos = rate->bitrate / 5;
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/* IEEE80211_RADIOTAP_CHANNEL */
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put_unaligned_le16(status->freq, pos);
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if (status->band == IEEE80211_BAND_5GHZ)
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put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
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else if (status->flag & RX_FLAG_HT)
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put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
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else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
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put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
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put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
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put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
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/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
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if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
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!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
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*pos = status->signal;
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cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
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/* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
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/* IEEE80211_RADIOTAP_ANTENNA */
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*pos = status->antenna;
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/* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
196
/* IEEE80211_RADIOTAP_RX_FLAGS */
197
/* ensure 2 byte alignment for the 2 byte field as required */
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if ((pos - (u8 *)rthdr) & 1)
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if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
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rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
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put_unaligned_le16(rx_flags, pos);
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if (status->flag & RX_FLAG_HT) {
206
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
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*pos++ = local->hw.radiotap_mcs_details;
209
if (status->flag & RX_FLAG_SHORT_GI)
210
*pos |= IEEE80211_RADIOTAP_MCS_SGI;
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if (status->flag & RX_FLAG_40MHZ)
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*pos |= IEEE80211_RADIOTAP_MCS_BW_40;
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if (status->flag & RX_FLAG_HT_GF)
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*pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
216
*pos++ = status->rate_idx;
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* This function copies a received frame to all monitor interfaces and
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* returns a cleaned-up SKB that no longer includes the FCS nor the
223
* radiotap header the driver might have added.
225
static struct sk_buff *
226
ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
227
struct ieee80211_rate *rate)
229
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
230
struct ieee80211_sub_if_data *sdata;
232
struct sk_buff *skb, *skb2;
233
struct net_device *prev_dev = NULL;
234
int present_fcs_len = 0;
237
* First, we may need to make a copy of the skb because
238
* (1) we need to modify it for radiotap (if not present), and
239
* (2) the other RX handlers will modify the skb we got.
241
* We don't need to, of course, if we aren't going to return
242
* the SKB because it has a bad FCS/PLCP checksum.
245
/* room for the radiotap header based on driver features */
246
needed_headroom = ieee80211_rx_radiotap_len(local, status);
248
if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
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present_fcs_len = FCS_LEN;
251
/* make sure hdr->frame_control is on the linear part */
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if (!pskb_may_pull(origskb, 2)) {
253
dev_kfree_skb(origskb);
257
if (!local->monitors) {
258
if (should_drop_frame(origskb, present_fcs_len)) {
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dev_kfree_skb(origskb);
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return remove_monitor_info(local, origskb);
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if (should_drop_frame(origskb, present_fcs_len)) {
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/* only need to expand headroom if necessary */
272
* This shouldn't trigger often because most devices have an
273
* RX header they pull before we get here, and that should
274
* be big enough for our radiotap information. We should
275
* probably export the length to drivers so that we can have
276
* them allocate enough headroom to start with.
278
if (skb_headroom(skb) < needed_headroom &&
279
pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
285
* Need to make a copy and possibly remove radiotap header
286
* and FCS from the original.
288
skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
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origskb = remove_monitor_info(local, origskb);
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/* prepend radiotap information */
297
ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
300
skb_reset_mac_header(skb);
301
skb->ip_summed = CHECKSUM_UNNECESSARY;
302
skb->pkt_type = PACKET_OTHERHOST;
303
skb->protocol = htons(ETH_P_802_2);
305
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
306
if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
309
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
312
if (!ieee80211_sdata_running(sdata))
316
skb2 = skb_clone(skb, GFP_ATOMIC);
318
skb2->dev = prev_dev;
319
netif_receive_skb(skb2);
323
prev_dev = sdata->dev;
324
sdata->dev->stats.rx_packets++;
325
sdata->dev->stats.rx_bytes += skb->len;
330
netif_receive_skb(skb);
338
static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
340
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
341
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
342
int tid, seqno_idx, security_idx;
344
/* does the frame have a qos control field? */
345
if (ieee80211_is_data_qos(hdr->frame_control)) {
346
u8 *qc = ieee80211_get_qos_ctl(hdr);
347
/* frame has qos control */
348
tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
349
if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
350
status->rx_flags |= IEEE80211_RX_AMSDU;
356
* IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
358
* Sequence numbers for management frames, QoS data
359
* frames with a broadcast/multicast address in the
360
* Address 1 field, and all non-QoS data frames sent
361
* by QoS STAs are assigned using an additional single
362
* modulo-4096 counter, [...]
364
* We also use that counter for non-QoS STAs.
366
seqno_idx = NUM_RX_DATA_QUEUES;
368
if (ieee80211_is_mgmt(hdr->frame_control))
369
security_idx = NUM_RX_DATA_QUEUES;
373
rx->seqno_idx = seqno_idx;
374
rx->security_idx = security_idx;
375
/* Set skb->priority to 1d tag if highest order bit of TID is not set.
376
* For now, set skb->priority to 0 for other cases. */
377
rx->skb->priority = (tid > 7) ? 0 : tid;
381
* DOC: Packet alignment
383
* Drivers always need to pass packets that are aligned to two-byte boundaries
386
* Additionally, should, if possible, align the payload data in a way that
387
* guarantees that the contained IP header is aligned to a four-byte
388
* boundary. In the case of regular frames, this simply means aligning the
389
* payload to a four-byte boundary (because either the IP header is directly
390
* contained, or IV/RFC1042 headers that have a length divisible by four are
391
* in front of it). If the payload data is not properly aligned and the
392
* architecture doesn't support efficient unaligned operations, mac80211
393
* will align the data.
395
* With A-MSDU frames, however, the payload data address must yield two modulo
396
* four because there are 14-byte 802.3 headers within the A-MSDU frames that
397
* push the IP header further back to a multiple of four again. Thankfully, the
398
* specs were sane enough this time around to require padding each A-MSDU
399
* subframe to a length that is a multiple of four.
401
* Padding like Atheros hardware adds which is between the 802.11 header and
402
* the payload is not supported, the driver is required to move the 802.11
403
* header to be directly in front of the payload in that case.
405
static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
407
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
408
WARN_ONCE((unsigned long)rx->skb->data & 1,
409
"unaligned packet at 0x%p\n", rx->skb->data);
416
static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
418
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
420
if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
423
return ieee80211_is_robust_mgmt_frame(hdr);
427
static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
429
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
431
if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
434
return ieee80211_is_robust_mgmt_frame(hdr);
438
/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
439
static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
441
struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
442
struct ieee80211_mmie *mmie;
444
if (skb->len < 24 + sizeof(*mmie) ||
445
!is_multicast_ether_addr(hdr->da))
448
if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
449
return -1; /* not a robust management frame */
451
mmie = (struct ieee80211_mmie *)
452
(skb->data + skb->len - sizeof(*mmie));
453
if (mmie->element_id != WLAN_EID_MMIE ||
454
mmie->length != sizeof(*mmie) - 2)
457
return le16_to_cpu(mmie->key_id);
461
static ieee80211_rx_result
462
ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
464
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
465
char *dev_addr = rx->sdata->vif.addr;
467
if (ieee80211_is_data(hdr->frame_control)) {
468
if (is_multicast_ether_addr(hdr->addr1)) {
469
if (ieee80211_has_tods(hdr->frame_control) ||
470
!ieee80211_has_fromds(hdr->frame_control))
471
return RX_DROP_MONITOR;
472
if (ether_addr_equal(hdr->addr3, dev_addr))
473
return RX_DROP_MONITOR;
475
if (!ieee80211_has_a4(hdr->frame_control))
476
return RX_DROP_MONITOR;
477
if (ether_addr_equal(hdr->addr4, dev_addr))
478
return RX_DROP_MONITOR;
482
/* If there is not an established peer link and this is not a peer link
483
* establisment frame, beacon or probe, drop the frame.
486
if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
487
struct ieee80211_mgmt *mgmt;
489
if (!ieee80211_is_mgmt(hdr->frame_control))
490
return RX_DROP_MONITOR;
492
if (ieee80211_is_action(hdr->frame_control)) {
494
mgmt = (struct ieee80211_mgmt *)hdr;
495
category = mgmt->u.action.category;
496
if (category != WLAN_CATEGORY_MESH_ACTION &&
497
category != WLAN_CATEGORY_SELF_PROTECTED)
498
return RX_DROP_MONITOR;
502
if (ieee80211_is_probe_req(hdr->frame_control) ||
503
ieee80211_is_probe_resp(hdr->frame_control) ||
504
ieee80211_is_beacon(hdr->frame_control) ||
505
ieee80211_is_auth(hdr->frame_control))
508
return RX_DROP_MONITOR;
515
#define SEQ_MODULO 0x1000
516
#define SEQ_MASK 0xfff
518
static inline int seq_less(u16 sq1, u16 sq2)
520
return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
523
static inline u16 seq_inc(u16 sq)
525
return (sq + 1) & SEQ_MASK;
528
static inline u16 seq_sub(u16 sq1, u16 sq2)
530
return (sq1 - sq2) & SEQ_MASK;
534
static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
535
struct tid_ampdu_rx *tid_agg_rx,
538
struct ieee80211_local *local = sdata->local;
539
struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
540
struct ieee80211_rx_status *status;
542
lockdep_assert_held(&tid_agg_rx->reorder_lock);
547
/* release the frame from the reorder ring buffer */
548
tid_agg_rx->stored_mpdu_num--;
549
tid_agg_rx->reorder_buf[index] = NULL;
550
status = IEEE80211_SKB_RXCB(skb);
551
status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
552
skb_queue_tail(&local->rx_skb_queue, skb);
555
tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
558
static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
559
struct tid_ampdu_rx *tid_agg_rx,
564
lockdep_assert_held(&tid_agg_rx->reorder_lock);
566
while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
567
index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
568
tid_agg_rx->buf_size;
569
ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
574
* Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
575
* the skb was added to the buffer longer than this time ago, the earlier
576
* frames that have not yet been received are assumed to be lost and the skb
577
* can be released for processing. This may also release other skb's from the
578
* reorder buffer if there are no additional gaps between the frames.
580
* Callers must hold tid_agg_rx->reorder_lock.
582
#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
584
static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
585
struct tid_ampdu_rx *tid_agg_rx)
589
lockdep_assert_held(&tid_agg_rx->reorder_lock);
591
/* release the buffer until next missing frame */
592
index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
593
tid_agg_rx->buf_size;
594
if (!tid_agg_rx->reorder_buf[index] &&
595
tid_agg_rx->stored_mpdu_num) {
597
* No buffers ready to be released, but check whether any
598
* frames in the reorder buffer have timed out.
601
for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
602
j = (j + 1) % tid_agg_rx->buf_size) {
603
if (!tid_agg_rx->reorder_buf[j]) {
608
!time_after(jiffies, tid_agg_rx->reorder_time[j] +
609
HT_RX_REORDER_BUF_TIMEOUT))
610
goto set_release_timer;
612
ht_dbg_ratelimited(sdata,
613
"release an RX reorder frame due to timeout on earlier frames\n");
614
ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
617
* Increment the head seq# also for the skipped slots.
619
tid_agg_rx->head_seq_num =
620
(tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
623
} else while (tid_agg_rx->reorder_buf[index]) {
624
ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
625
index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
626
tid_agg_rx->buf_size;
629
if (tid_agg_rx->stored_mpdu_num) {
630
j = index = seq_sub(tid_agg_rx->head_seq_num,
631
tid_agg_rx->ssn) % tid_agg_rx->buf_size;
633
for (; j != (index - 1) % tid_agg_rx->buf_size;
634
j = (j + 1) % tid_agg_rx->buf_size) {
635
if (tid_agg_rx->reorder_buf[j])
641
mod_timer(&tid_agg_rx->reorder_timer,
642
tid_agg_rx->reorder_time[j] + 1 +
643
HT_RX_REORDER_BUF_TIMEOUT);
645
del_timer(&tid_agg_rx->reorder_timer);
650
* As this function belongs to the RX path it must be under
651
* rcu_read_lock protection. It returns false if the frame
652
* can be processed immediately, true if it was consumed.
654
static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
655
struct tid_ampdu_rx *tid_agg_rx,
658
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
659
u16 sc = le16_to_cpu(hdr->seq_ctrl);
660
u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
661
u16 head_seq_num, buf_size;
665
spin_lock(&tid_agg_rx->reorder_lock);
667
buf_size = tid_agg_rx->buf_size;
668
head_seq_num = tid_agg_rx->head_seq_num;
670
/* frame with out of date sequence number */
671
if (seq_less(mpdu_seq_num, head_seq_num)) {
677
* If frame the sequence number exceeds our buffering window
678
* size release some previous frames to make room for this one.
680
if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
681
head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
682
/* release stored frames up to new head to stack */
683
ieee80211_release_reorder_frames(sdata, tid_agg_rx,
687
/* Now the new frame is always in the range of the reordering buffer */
689
index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
691
/* check if we already stored this frame */
692
if (tid_agg_rx->reorder_buf[index]) {
698
* If the current MPDU is in the right order and nothing else
699
* is stored we can process it directly, no need to buffer it.
700
* If it is first but there's something stored, we may be able
701
* to release frames after this one.
703
if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
704
tid_agg_rx->stored_mpdu_num == 0) {
705
tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
710
/* put the frame in the reordering buffer */
711
tid_agg_rx->reorder_buf[index] = skb;
712
tid_agg_rx->reorder_time[index] = jiffies;
713
tid_agg_rx->stored_mpdu_num++;
714
ieee80211_sta_reorder_release(sdata, tid_agg_rx);
717
spin_unlock(&tid_agg_rx->reorder_lock);
722
* Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
723
* true if the MPDU was buffered, false if it should be processed.
725
static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
727
struct sk_buff *skb = rx->skb;
728
struct ieee80211_local *local = rx->local;
729
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
730
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
731
struct sta_info *sta = rx->sta;
732
struct tid_ampdu_rx *tid_agg_rx;
736
if (!ieee80211_is_data_qos(hdr->frame_control))
740
* filter the QoS data rx stream according to
741
* STA/TID and check if this STA/TID is on aggregation
747
ack_policy = *ieee80211_get_qos_ctl(hdr) &
748
IEEE80211_QOS_CTL_ACK_POLICY_MASK;
749
tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
751
tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
755
/* qos null data frames are excluded */
756
if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
759
/* not part of a BA session */
760
if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
761
ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
764
/* not actually part of this BA session */
765
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
768
/* new, potentially un-ordered, ampdu frame - process it */
770
/* reset session timer */
771
if (tid_agg_rx->timeout)
772
tid_agg_rx->last_rx = jiffies;
774
/* if this mpdu is fragmented - terminate rx aggregation session */
775
sc = le16_to_cpu(hdr->seq_ctrl);
776
if (sc & IEEE80211_SCTL_FRAG) {
777
skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
778
skb_queue_tail(&rx->sdata->skb_queue, skb);
779
ieee80211_queue_work(&local->hw, &rx->sdata->work);
784
* No locking needed -- we will only ever process one
785
* RX packet at a time, and thus own tid_agg_rx. All
786
* other code manipulating it needs to (and does) make
787
* sure that we cannot get to it any more before doing
790
if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb))
794
skb_queue_tail(&local->rx_skb_queue, skb);
797
static ieee80211_rx_result debug_noinline
798
ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
800
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
801
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
803
/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
804
if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
805
if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
806
rx->sta->last_seq_ctrl[rx->seqno_idx] ==
808
if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
809
rx->local->dot11FrameDuplicateCount++;
810
rx->sta->num_duplicates++;
812
return RX_DROP_UNUSABLE;
814
rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
817
if (unlikely(rx->skb->len < 16)) {
818
I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
819
return RX_DROP_MONITOR;
822
/* Drop disallowed frame classes based on STA auth/assoc state;
823
* IEEE 802.11, Chap 5.5.
825
* mac80211 filters only based on association state, i.e. it drops
826
* Class 3 frames from not associated stations. hostapd sends
827
* deauth/disassoc frames when needed. In addition, hostapd is
828
* responsible for filtering on both auth and assoc states.
831
if (ieee80211_vif_is_mesh(&rx->sdata->vif))
832
return ieee80211_rx_mesh_check(rx);
834
if (unlikely((ieee80211_is_data(hdr->frame_control) ||
835
ieee80211_is_pspoll(hdr->frame_control)) &&
836
rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
837
rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
838
(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
840
* accept port control frames from the AP even when it's not
841
* yet marked ASSOC to prevent a race where we don't set the
842
* assoc bit quickly enough before it sends the first frame
844
if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
845
ieee80211_is_data_present(hdr->frame_control)) {
849
payload = rx->skb->data +
850
ieee80211_hdrlen(hdr->frame_control);
851
ethertype = (payload[6] << 8) | payload[7];
852
if (cpu_to_be16(ethertype) ==
853
rx->sdata->control_port_protocol)
857
if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
858
cfg80211_rx_spurious_frame(rx->sdata->dev,
861
return RX_DROP_UNUSABLE;
863
return RX_DROP_MONITOR;
870
static ieee80211_rx_result debug_noinline
871
ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
873
struct sk_buff *skb = rx->skb;
874
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
875
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
878
ieee80211_rx_result result = RX_DROP_UNUSABLE;
879
struct ieee80211_key *sta_ptk = NULL;
880
int mmie_keyidx = -1;
886
* There are four types of keys:
888
* - IGTK (group keys for management frames)
889
* - PTK (pairwise keys)
890
* - STK (station-to-station pairwise keys)
892
* When selecting a key, we have to distinguish between multicast
893
* (including broadcast) and unicast frames, the latter can only
894
* use PTKs and STKs while the former always use GTKs and IGTKs.
895
* Unless, of course, actual WEP keys ("pre-RSNA") are used, then
896
* unicast frames can also use key indices like GTKs. Hence, if we
897
* don't have a PTK/STK we check the key index for a WEP key.
899
* Note that in a regular BSS, multicast frames are sent by the
900
* AP only, associated stations unicast the frame to the AP first
901
* which then multicasts it on their behalf.
903
* There is also a slight problem in IBSS mode: GTKs are negotiated
904
* with each station, that is something we don't currently handle.
905
* The spec seems to expect that one negotiates the same key with
906
* every station but there's no such requirement; VLANs could be
911
* No point in finding a key and decrypting if the frame is neither
912
* addressed to us nor a multicast frame.
914
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
917
/* start without a key */
921
sta_ptk = rcu_dereference(rx->sta->ptk);
923
fc = hdr->frame_control;
925
if (!ieee80211_has_protected(fc))
926
mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
928
if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
930
if ((status->flag & RX_FLAG_DECRYPTED) &&
931
(status->flag & RX_FLAG_IV_STRIPPED))
933
/* Skip decryption if the frame is not protected. */
934
if (!ieee80211_has_protected(fc))
936
} else if (mmie_keyidx >= 0) {
937
/* Broadcast/multicast robust management frame / BIP */
938
if ((status->flag & RX_FLAG_DECRYPTED) &&
939
(status->flag & RX_FLAG_IV_STRIPPED))
942
if (mmie_keyidx < NUM_DEFAULT_KEYS ||
943
mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
944
return RX_DROP_MONITOR; /* unexpected BIP keyidx */
946
rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
948
rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
949
} else if (!ieee80211_has_protected(fc)) {
951
* The frame was not protected, so skip decryption. However, we
952
* need to set rx->key if there is a key that could have been
953
* used so that the frame may be dropped if encryption would
954
* have been expected.
956
struct ieee80211_key *key = NULL;
957
struct ieee80211_sub_if_data *sdata = rx->sdata;
960
if (ieee80211_is_mgmt(fc) &&
961
is_multicast_ether_addr(hdr->addr1) &&
962
(key = rcu_dereference(rx->sdata->default_mgmt_key)))
966
for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
967
key = rcu_dereference(rx->sta->gtk[i]);
973
for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
974
key = rcu_dereference(sdata->keys[i]);
986
* The device doesn't give us the IV so we won't be
987
* able to look up the key. That's ok though, we
988
* don't need to decrypt the frame, we just won't
989
* be able to keep statistics accurate.
990
* Except for key threshold notifications, should
991
* we somehow allow the driver to tell us which key
992
* the hardware used if this flag is set?
994
if ((status->flag & RX_FLAG_DECRYPTED) &&
995
(status->flag & RX_FLAG_IV_STRIPPED))
998
hdrlen = ieee80211_hdrlen(fc);
1000
if (rx->skb->len < 8 + hdrlen)
1001
return RX_DROP_UNUSABLE; /* TODO: count this? */
1004
* no need to call ieee80211_wep_get_keyidx,
1005
* it verifies a bunch of things we've done already
1007
skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1008
keyidx = keyid >> 6;
1010
/* check per-station GTK first, if multicast packet */
1011
if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1012
rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1014
/* if not found, try default key */
1016
rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1019
* RSNA-protected unicast frames should always be
1020
* sent with pairwise or station-to-station keys,
1021
* but for WEP we allow using a key index as well.
1024
rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1025
rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1026
!is_multicast_ether_addr(hdr->addr1))
1032
if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1033
return RX_DROP_MONITOR;
1035
rx->key->tx_rx_count++;
1036
/* TODO: add threshold stuff again */
1038
return RX_DROP_MONITOR;
1041
switch (rx->key->conf.cipher) {
1042
case WLAN_CIPHER_SUITE_WEP40:
1043
case WLAN_CIPHER_SUITE_WEP104:
1044
result = ieee80211_crypto_wep_decrypt(rx);
1046
case WLAN_CIPHER_SUITE_TKIP:
1047
result = ieee80211_crypto_tkip_decrypt(rx);
1049
case WLAN_CIPHER_SUITE_CCMP:
1050
result = ieee80211_crypto_ccmp_decrypt(rx);
1052
case WLAN_CIPHER_SUITE_AES_CMAC:
1053
result = ieee80211_crypto_aes_cmac_decrypt(rx);
1057
* We can reach here only with HW-only algorithms
1058
* but why didn't it decrypt the frame?!
1060
return RX_DROP_UNUSABLE;
1063
/* the hdr variable is invalid after the decrypt handlers */
1065
/* either the frame has been decrypted or will be dropped */
1066
status->flag |= RX_FLAG_DECRYPTED;
1071
static ieee80211_rx_result debug_noinline
1072
ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1074
struct ieee80211_local *local;
1075
struct ieee80211_hdr *hdr;
1076
struct sk_buff *skb;
1080
hdr = (struct ieee80211_hdr *) skb->data;
1082
if (!local->pspolling)
1085
if (!ieee80211_has_fromds(hdr->frame_control))
1086
/* this is not from AP */
1089
if (!ieee80211_is_data(hdr->frame_control))
1092
if (!ieee80211_has_moredata(hdr->frame_control)) {
1093
/* AP has no more frames buffered for us */
1094
local->pspolling = false;
1098
/* more data bit is set, let's request a new frame from the AP */
1099
ieee80211_send_pspoll(local, rx->sdata);
1104
static void ap_sta_ps_start(struct sta_info *sta)
1106
struct ieee80211_sub_if_data *sdata = sta->sdata;
1107
struct ieee80211_local *local = sdata->local;
1109
atomic_inc(&sdata->bss->num_sta_ps);
1110
set_sta_flag(sta, WLAN_STA_PS_STA);
1111
if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1112
drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1113
ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1114
sta->sta.addr, sta->sta.aid);
1117
static void ap_sta_ps_end(struct sta_info *sta)
1119
ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1120
sta->sta.addr, sta->sta.aid);
1122
if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1123
ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1124
sta->sta.addr, sta->sta.aid);
1128
ieee80211_sta_ps_deliver_wakeup(sta);
1131
int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1133
struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1136
WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1138
/* Don't let the same PS state be set twice */
1139
in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1140
if ((start && in_ps) || (!start && !in_ps))
1144
ap_sta_ps_start(sta_inf);
1146
ap_sta_ps_end(sta_inf);
1150
EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1152
static ieee80211_rx_result debug_noinline
1153
ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1155
struct ieee80211_sub_if_data *sdata = rx->sdata;
1156
struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1157
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1160
if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1163
if (sdata->vif.type != NL80211_IFTYPE_AP &&
1164
sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1168
* The device handles station powersave, so don't do anything about
1169
* uAPSD and PS-Poll frames (the latter shouldn't even come up from
1170
* it to mac80211 since they're handled.)
1172
if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1176
* Don't do anything if the station isn't already asleep. In
1177
* the uAPSD case, the station will probably be marked asleep,
1178
* in the PS-Poll case the station must be confused ...
1180
if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1183
if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1184
if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1185
if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1186
ieee80211_sta_ps_deliver_poll_response(rx->sta);
1188
set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1191
/* Free PS Poll skb here instead of returning RX_DROP that would
1192
* count as an dropped frame. */
1193
dev_kfree_skb(rx->skb);
1196
} else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1197
!(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1198
ieee80211_has_pm(hdr->frame_control) &&
1199
(ieee80211_is_data_qos(hdr->frame_control) ||
1200
ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1201
tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1202
ac = ieee802_1d_to_ac[tid & 7];
1205
* If this AC is not trigger-enabled do nothing.
1207
* NB: This could/should check a separate bitmap of trigger-
1208
* enabled queues, but for now we only implement uAPSD w/o
1209
* TSPEC changes to the ACs, so they're always the same.
1211
if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1214
/* if we are in a service period, do nothing */
1215
if (test_sta_flag(rx->sta, WLAN_STA_SP))
1218
if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1219
ieee80211_sta_ps_deliver_uapsd(rx->sta);
1221
set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1227
static ieee80211_rx_result debug_noinline
1228
ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1230
struct sta_info *sta = rx->sta;
1231
struct sk_buff *skb = rx->skb;
1232
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1233
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1239
* Update last_rx only for IBSS packets which are for the current
1240
* BSSID to avoid keeping the current IBSS network alive in cases
1241
* where other STAs start using different BSSID.
1243
if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1244
u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1245
NL80211_IFTYPE_ADHOC);
1246
if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid)) {
1247
sta->last_rx = jiffies;
1248
if (ieee80211_is_data(hdr->frame_control)) {
1249
sta->last_rx_rate_idx = status->rate_idx;
1250
sta->last_rx_rate_flag = status->flag;
1253
} else if (!is_multicast_ether_addr(hdr->addr1)) {
1255
* Mesh beacons will update last_rx when if they are found to
1256
* match the current local configuration when processed.
1258
sta->last_rx = jiffies;
1259
if (ieee80211_is_data(hdr->frame_control)) {
1260
sta->last_rx_rate_idx = status->rate_idx;
1261
sta->last_rx_rate_flag = status->flag;
1265
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1268
if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1269
ieee80211_sta_rx_notify(rx->sdata, hdr);
1271
sta->rx_fragments++;
1272
sta->rx_bytes += rx->skb->len;
1273
if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1274
sta->last_signal = status->signal;
1275
ewma_add(&sta->avg_signal, -status->signal);
1279
* Change STA power saving mode only at the end of a frame
1280
* exchange sequence.
1282
if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1283
!ieee80211_has_morefrags(hdr->frame_control) &&
1284
!(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1285
(rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1286
rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1287
if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1289
* Ignore doze->wake transitions that are
1290
* indicated by non-data frames, the standard
1291
* is unclear here, but for example going to
1292
* PS mode and then scanning would cause a
1293
* doze->wake transition for the probe request,
1294
* and that is clearly undesirable.
1296
if (ieee80211_is_data(hdr->frame_control) &&
1297
!ieee80211_has_pm(hdr->frame_control))
1300
if (ieee80211_has_pm(hdr->frame_control))
1301
ap_sta_ps_start(sta);
1306
* Drop (qos-)data::nullfunc frames silently, since they
1307
* are used only to control station power saving mode.
1309
if (ieee80211_is_nullfunc(hdr->frame_control) ||
1310
ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1311
I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1314
* If we receive a 4-addr nullfunc frame from a STA
1315
* that was not moved to a 4-addr STA vlan yet send
1316
* the event to userspace and for older hostapd drop
1317
* the frame to the monitor interface.
1319
if (ieee80211_has_a4(hdr->frame_control) &&
1320
(rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1321
(rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1322
!rx->sdata->u.vlan.sta))) {
1323
if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1324
cfg80211_rx_unexpected_4addr_frame(
1325
rx->sdata->dev, sta->sta.addr,
1327
return RX_DROP_MONITOR;
1330
* Update counter and free packet here to avoid
1331
* counting this as a dropped packed.
1334
dev_kfree_skb(rx->skb);
1339
} /* ieee80211_rx_h_sta_process */
1341
static inline struct ieee80211_fragment_entry *
1342
ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1343
unsigned int frag, unsigned int seq, int rx_queue,
1344
struct sk_buff **skb)
1346
struct ieee80211_fragment_entry *entry;
1349
idx = sdata->fragment_next;
1350
entry = &sdata->fragments[sdata->fragment_next++];
1351
if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1352
sdata->fragment_next = 0;
1354
if (!skb_queue_empty(&entry->skb_list))
1355
__skb_queue_purge(&entry->skb_list);
1357
__skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1359
entry->first_frag_time = jiffies;
1361
entry->rx_queue = rx_queue;
1362
entry->last_frag = frag;
1364
entry->extra_len = 0;
1369
static inline struct ieee80211_fragment_entry *
1370
ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1371
unsigned int frag, unsigned int seq,
1372
int rx_queue, struct ieee80211_hdr *hdr)
1374
struct ieee80211_fragment_entry *entry;
1377
idx = sdata->fragment_next;
1378
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1379
struct ieee80211_hdr *f_hdr;
1383
idx = IEEE80211_FRAGMENT_MAX - 1;
1385
entry = &sdata->fragments[idx];
1386
if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1387
entry->rx_queue != rx_queue ||
1388
entry->last_frag + 1 != frag)
1391
f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1394
* Check ftype and addresses are equal, else check next fragment
1396
if (((hdr->frame_control ^ f_hdr->frame_control) &
1397
cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1398
!ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1399
!ether_addr_equal(hdr->addr2, f_hdr->addr2))
1402
if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1403
__skb_queue_purge(&entry->skb_list);
1412
static ieee80211_rx_result debug_noinline
1413
ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1415
struct ieee80211_hdr *hdr;
1418
unsigned int frag, seq;
1419
struct ieee80211_fragment_entry *entry;
1420
struct sk_buff *skb;
1421
struct ieee80211_rx_status *status;
1423
hdr = (struct ieee80211_hdr *)rx->skb->data;
1424
fc = hdr->frame_control;
1425
sc = le16_to_cpu(hdr->seq_ctrl);
1426
frag = sc & IEEE80211_SCTL_FRAG;
1428
if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1429
(rx->skb)->len < 24 ||
1430
is_multicast_ether_addr(hdr->addr1))) {
1431
/* not fragmented */
1434
I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1436
if (skb_linearize(rx->skb))
1437
return RX_DROP_UNUSABLE;
1440
* skb_linearize() might change the skb->data and
1441
* previously cached variables (in this case, hdr) need to
1442
* be refreshed with the new data.
1444
hdr = (struct ieee80211_hdr *)rx->skb->data;
1445
seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1448
/* This is the first fragment of a new frame. */
1449
entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1450
rx->seqno_idx, &(rx->skb));
1451
if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1452
ieee80211_has_protected(fc)) {
1453
int queue = rx->security_idx;
1454
/* Store CCMP PN so that we can verify that the next
1455
* fragment has a sequential PN value. */
1457
memcpy(entry->last_pn,
1458
rx->key->u.ccmp.rx_pn[queue],
1464
/* This is a fragment for a frame that should already be pending in
1465
* fragment cache. Add this fragment to the end of the pending entry.
1467
entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1468
rx->seqno_idx, hdr);
1470
I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1471
return RX_DROP_MONITOR;
1474
/* Verify that MPDUs within one MSDU have sequential PN values.
1475
* (IEEE 802.11i, 8.3.3.4.5) */
1478
u8 pn[CCMP_PN_LEN], *rpn;
1480
if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1481
return RX_DROP_UNUSABLE;
1482
memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1483
for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1488
queue = rx->security_idx;
1489
rpn = rx->key->u.ccmp.rx_pn[queue];
1490
if (memcmp(pn, rpn, CCMP_PN_LEN))
1491
return RX_DROP_UNUSABLE;
1492
memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1495
skb_pull(rx->skb, ieee80211_hdrlen(fc));
1496
__skb_queue_tail(&entry->skb_list, rx->skb);
1497
entry->last_frag = frag;
1498
entry->extra_len += rx->skb->len;
1499
if (ieee80211_has_morefrags(fc)) {
1504
rx->skb = __skb_dequeue(&entry->skb_list);
1505
if (skb_tailroom(rx->skb) < entry->extra_len) {
1506
I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1507
if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1509
I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1510
__skb_queue_purge(&entry->skb_list);
1511
return RX_DROP_UNUSABLE;
1514
while ((skb = __skb_dequeue(&entry->skb_list))) {
1515
memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1519
/* Complete frame has been reassembled - process it now */
1520
status = IEEE80211_SKB_RXCB(rx->skb);
1521
status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1525
rx->sta->rx_packets++;
1526
if (is_multicast_ether_addr(hdr->addr1))
1527
rx->local->dot11MulticastReceivedFrameCount++;
1529
ieee80211_led_rx(rx->local);
1534
ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1536
if (unlikely(!rx->sta ||
1537
!test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1544
ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1546
struct sk_buff *skb = rx->skb;
1547
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1550
* Pass through unencrypted frames if the hardware has
1551
* decrypted them already.
1553
if (status->flag & RX_FLAG_DECRYPTED)
1556
/* Drop unencrypted frames if key is set. */
1557
if (unlikely(!ieee80211_has_protected(fc) &&
1558
!ieee80211_is_nullfunc(fc) &&
1559
ieee80211_is_data(fc) &&
1560
(rx->key || rx->sdata->drop_unencrypted)))
1567
ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1569
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1570
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1571
__le16 fc = hdr->frame_control;
1574
* Pass through unencrypted frames if the hardware has
1575
* decrypted them already.
1577
if (status->flag & RX_FLAG_DECRYPTED)
1580
if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1581
if (unlikely(!ieee80211_has_protected(fc) &&
1582
ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1584
if (ieee80211_is_deauth(fc))
1585
cfg80211_send_unprot_deauth(rx->sdata->dev,
1588
else if (ieee80211_is_disassoc(fc))
1589
cfg80211_send_unprot_disassoc(rx->sdata->dev,
1594
/* BIP does not use Protected field, so need to check MMIE */
1595
if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1596
ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1597
if (ieee80211_is_deauth(fc))
1598
cfg80211_send_unprot_deauth(rx->sdata->dev,
1601
else if (ieee80211_is_disassoc(fc))
1602
cfg80211_send_unprot_disassoc(rx->sdata->dev,
1608
* When using MFP, Action frames are not allowed prior to
1609
* having configured keys.
1611
if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1612
ieee80211_is_robust_mgmt_frame(
1613
(struct ieee80211_hdr *) rx->skb->data)))
1621
__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1623
struct ieee80211_sub_if_data *sdata = rx->sdata;
1624
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1625
bool check_port_control = false;
1626
struct ethhdr *ehdr;
1629
*port_control = false;
1630
if (ieee80211_has_a4(hdr->frame_control) &&
1631
sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1634
if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1635
!!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1637
if (!sdata->u.mgd.use_4addr)
1640
check_port_control = true;
1643
if (is_multicast_ether_addr(hdr->addr1) &&
1644
sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1647
ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1651
ehdr = (struct ethhdr *) rx->skb->data;
1652
if (ehdr->h_proto == rx->sdata->control_port_protocol)
1653
*port_control = true;
1654
else if (check_port_control)
1661
* requires that rx->skb is a frame with ethernet header
1663
static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1665
static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1666
= { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1667
struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1670
* Allow EAPOL frames to us/the PAE group address regardless
1671
* of whether the frame was encrypted or not.
1673
if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1674
(ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1675
ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1678
if (ieee80211_802_1x_port_control(rx) ||
1679
ieee80211_drop_unencrypted(rx, fc))
1686
* requires that rx->skb is a frame with ethernet header
1689
ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1691
struct ieee80211_sub_if_data *sdata = rx->sdata;
1692
struct net_device *dev = sdata->dev;
1693
struct sk_buff *skb, *xmit_skb;
1694
struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1695
struct sta_info *dsta;
1696
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1701
if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1702
sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1703
!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1704
(status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1705
(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1706
if (is_multicast_ether_addr(ehdr->h_dest)) {
1708
* send multicast frames both to higher layers in
1709
* local net stack and back to the wireless medium
1711
xmit_skb = skb_copy(skb, GFP_ATOMIC);
1713
net_info_ratelimited("%s: failed to clone multicast frame\n",
1716
dsta = sta_info_get(sdata, skb->data);
1719
* The destination station is associated to
1720
* this AP (in this VLAN), so send the frame
1721
* directly to it and do not pass it to local
1731
int align __maybe_unused;
1733
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1735
* 'align' will only take the values 0 or 2 here
1736
* since all frames are required to be aligned
1737
* to 2-byte boundaries when being passed to
1738
* mac80211. That also explains the __skb_push()
1741
align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1743
if (WARN_ON(skb_headroom(skb) < 3)) {
1747
u8 *data = skb->data;
1748
size_t len = skb_headlen(skb);
1750
memmove(skb->data, data, len);
1751
skb_set_tail_pointer(skb, len);
1757
/* deliver to local stack */
1758
skb->protocol = eth_type_trans(skb, dev);
1759
memset(skb->cb, 0, sizeof(skb->cb));
1760
netif_receive_skb(skb);
1766
* Send to wireless media and increase priority by 256 to
1767
* keep the received priority instead of reclassifying
1768
* the frame (see cfg80211_classify8021d).
1770
xmit_skb->priority += 256;
1771
xmit_skb->protocol = htons(ETH_P_802_3);
1772
skb_reset_network_header(xmit_skb);
1773
skb_reset_mac_header(xmit_skb);
1774
dev_queue_xmit(xmit_skb);
1778
static ieee80211_rx_result debug_noinline
1779
ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1781
struct net_device *dev = rx->sdata->dev;
1782
struct sk_buff *skb = rx->skb;
1783
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1784
__le16 fc = hdr->frame_control;
1785
struct sk_buff_head frame_list;
1786
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1788
if (unlikely(!ieee80211_is_data(fc)))
1791
if (unlikely(!ieee80211_is_data_present(fc)))
1792
return RX_DROP_MONITOR;
1794
if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1797
if (ieee80211_has_a4(hdr->frame_control) &&
1798
rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1799
!rx->sdata->u.vlan.sta)
1800
return RX_DROP_UNUSABLE;
1802
if (is_multicast_ether_addr(hdr->addr1) &&
1803
((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1804
rx->sdata->u.vlan.sta) ||
1805
(rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1806
rx->sdata->u.mgd.use_4addr)))
1807
return RX_DROP_UNUSABLE;
1810
__skb_queue_head_init(&frame_list);
1812
if (skb_linearize(skb))
1813
return RX_DROP_UNUSABLE;
1815
ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1816
rx->sdata->vif.type,
1817
rx->local->hw.extra_tx_headroom, true);
1819
while (!skb_queue_empty(&frame_list)) {
1820
rx->skb = __skb_dequeue(&frame_list);
1822
if (!ieee80211_frame_allowed(rx, fc)) {
1823
dev_kfree_skb(rx->skb);
1826
dev->stats.rx_packets++;
1827
dev->stats.rx_bytes += rx->skb->len;
1829
ieee80211_deliver_skb(rx);
1835
#ifdef CONFIG_MAC80211_MESH
1836
static ieee80211_rx_result
1837
ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1839
struct ieee80211_hdr *fwd_hdr, *hdr;
1840
struct ieee80211_tx_info *info;
1841
struct ieee80211s_hdr *mesh_hdr;
1842
struct sk_buff *skb = rx->skb, *fwd_skb;
1843
struct ieee80211_local *local = rx->local;
1844
struct ieee80211_sub_if_data *sdata = rx->sdata;
1845
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1846
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1847
__le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1850
hdr = (struct ieee80211_hdr *) skb->data;
1851
hdrlen = ieee80211_hdrlen(hdr->frame_control);
1852
mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1854
/* frame is in RMC, don't forward */
1855
if (ieee80211_is_data(hdr->frame_control) &&
1856
is_multicast_ether_addr(hdr->addr1) &&
1857
mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1858
return RX_DROP_MONITOR;
1860
if (!ieee80211_is_data(hdr->frame_control))
1864
return RX_DROP_MONITOR;
1866
if (mesh_hdr->flags & MESH_FLAGS_AE) {
1867
struct mesh_path *mppath;
1871
if (is_multicast_ether_addr(hdr->addr1)) {
1872
mpp_addr = hdr->addr3;
1873
proxied_addr = mesh_hdr->eaddr1;
1875
mpp_addr = hdr->addr4;
1876
proxied_addr = mesh_hdr->eaddr2;
1880
mppath = mpp_path_lookup(proxied_addr, sdata);
1882
mpp_path_add(proxied_addr, mpp_addr, sdata);
1884
spin_lock_bh(&mppath->state_lock);
1885
if (!ether_addr_equal(mppath->mpp, mpp_addr))
1886
memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1887
spin_unlock_bh(&mppath->state_lock);
1892
/* Frame has reached destination. Don't forward */
1893
if (!is_multicast_ether_addr(hdr->addr1) &&
1894
ether_addr_equal(sdata->vif.addr, hdr->addr3))
1897
q = ieee80211_select_queue_80211(sdata, skb, hdr);
1898
if (ieee80211_queue_stopped(&local->hw, q)) {
1899
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
1900
return RX_DROP_MONITOR;
1902
skb_set_queue_mapping(skb, q);
1904
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1907
if (!--mesh_hdr->ttl) {
1908
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1909
return RX_DROP_MONITOR;
1912
if (!ifmsh->mshcfg.dot11MeshForwarding)
1915
fwd_skb = skb_copy(skb, GFP_ATOMIC);
1917
net_info_ratelimited("%s: failed to clone mesh frame\n",
1922
fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1923
info = IEEE80211_SKB_CB(fwd_skb);
1924
memset(info, 0, sizeof(*info));
1925
info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1926
info->control.vif = &rx->sdata->vif;
1927
info->control.jiffies = jiffies;
1928
if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1929
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1930
memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1931
} else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1932
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1934
/* unable to resolve next hop */
1935
mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1936
0, reason, fwd_hdr->addr2, sdata);
1937
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
1939
return RX_DROP_MONITOR;
1942
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1943
ieee80211_add_pending_skb(local, fwd_skb);
1945
if (is_multicast_ether_addr(hdr->addr1) ||
1946
sdata->dev->flags & IFF_PROMISC)
1949
return RX_DROP_MONITOR;
1953
static ieee80211_rx_result debug_noinline
1954
ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1956
struct ieee80211_sub_if_data *sdata = rx->sdata;
1957
struct ieee80211_local *local = rx->local;
1958
struct net_device *dev = sdata->dev;
1959
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1960
__le16 fc = hdr->frame_control;
1964
if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1967
if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1968
return RX_DROP_MONITOR;
1971
* Send unexpected-4addr-frame event to hostapd. For older versions,
1972
* also drop the frame to cooked monitor interfaces.
1974
if (ieee80211_has_a4(hdr->frame_control) &&
1975
sdata->vif.type == NL80211_IFTYPE_AP) {
1977
!test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
1978
cfg80211_rx_unexpected_4addr_frame(
1979
rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
1980
return RX_DROP_MONITOR;
1983
err = __ieee80211_data_to_8023(rx, &port_control);
1985
return RX_DROP_UNUSABLE;
1987
if (!ieee80211_frame_allowed(rx, fc))
1988
return RX_DROP_MONITOR;
1990
if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1991
unlikely(port_control) && sdata->bss) {
1992
sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2000
dev->stats.rx_packets++;
2001
dev->stats.rx_bytes += rx->skb->len;
2003
if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2004
!is_multicast_ether_addr(
2005
((struct ethhdr *)rx->skb->data)->h_dest) &&
2006
(!local->scanning &&
2007
!test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2008
mod_timer(&local->dynamic_ps_timer, jiffies +
2009
msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2012
ieee80211_deliver_skb(rx);
2017
static ieee80211_rx_result debug_noinline
2018
ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2020
struct sk_buff *skb = rx->skb;
2021
struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2022
struct tid_ampdu_rx *tid_agg_rx;
2026
if (likely(!ieee80211_is_ctl(bar->frame_control)))
2029
if (ieee80211_is_back_req(bar->frame_control)) {
2031
__le16 control, start_seq_num;
2032
} __packed bar_data;
2035
return RX_DROP_MONITOR;
2037
if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2038
&bar_data, sizeof(bar_data)))
2039
return RX_DROP_MONITOR;
2041
tid = le16_to_cpu(bar_data.control) >> 12;
2043
tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2045
return RX_DROP_MONITOR;
2047
start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2049
/* reset session timer */
2050
if (tid_agg_rx->timeout)
2051
mod_timer(&tid_agg_rx->session_timer,
2052
TU_TO_EXP_TIME(tid_agg_rx->timeout));
2054
spin_lock(&tid_agg_rx->reorder_lock);
2055
/* release stored frames up to start of BAR */
2056
ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2058
spin_unlock(&tid_agg_rx->reorder_lock);
2065
* After this point, we only want management frames,
2066
* so we can drop all remaining control frames to
2067
* cooked monitor interfaces.
2069
return RX_DROP_MONITOR;
2072
static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2073
struct ieee80211_mgmt *mgmt,
2076
struct ieee80211_local *local = sdata->local;
2077
struct sk_buff *skb;
2078
struct ieee80211_mgmt *resp;
2080
if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2081
/* Not to own unicast address */
2085
if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2086
!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2087
/* Not from the current AP or not associated yet. */
2091
if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2092
/* Too short SA Query request frame */
2096
skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2100
skb_reserve(skb, local->hw.extra_tx_headroom);
2101
resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2102
memset(resp, 0, 24);
2103
memcpy(resp->da, mgmt->sa, ETH_ALEN);
2104
memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2105
memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2106
resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2107
IEEE80211_STYPE_ACTION);
2108
skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2109
resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2110
resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2111
memcpy(resp->u.action.u.sa_query.trans_id,
2112
mgmt->u.action.u.sa_query.trans_id,
2113
WLAN_SA_QUERY_TR_ID_LEN);
2115
ieee80211_tx_skb(sdata, skb);
2118
static ieee80211_rx_result debug_noinline
2119
ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2121
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2122
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2125
* From here on, look only at management frames.
2126
* Data and control frames are already handled,
2127
* and unknown (reserved) frames are useless.
2129
if (rx->skb->len < 24)
2130
return RX_DROP_MONITOR;
2132
if (!ieee80211_is_mgmt(mgmt->frame_control))
2133
return RX_DROP_MONITOR;
2135
if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2136
ieee80211_is_beacon(mgmt->frame_control) &&
2137
!(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2140
if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2141
sig = status->signal;
2143
cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2144
rx->skb->data, rx->skb->len,
2145
status->freq, sig, GFP_ATOMIC);
2146
rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2149
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2150
return RX_DROP_MONITOR;
2152
if (ieee80211_drop_unencrypted_mgmt(rx))
2153
return RX_DROP_UNUSABLE;
2158
static ieee80211_rx_result debug_noinline
2159
ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2161
struct ieee80211_local *local = rx->local;
2162
struct ieee80211_sub_if_data *sdata = rx->sdata;
2163
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2164
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2165
int len = rx->skb->len;
2167
if (!ieee80211_is_action(mgmt->frame_control))
2170
/* drop too small frames */
2171
if (len < IEEE80211_MIN_ACTION_SIZE)
2172
return RX_DROP_UNUSABLE;
2174
if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2175
return RX_DROP_UNUSABLE;
2177
if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2178
return RX_DROP_UNUSABLE;
2180
switch (mgmt->u.action.category) {
2181
case WLAN_CATEGORY_HT:
2182
/* reject HT action frames from stations not supporting HT */
2183
if (!rx->sta->sta.ht_cap.ht_supported)
2186
if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2187
sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2188
sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2189
sdata->vif.type != NL80211_IFTYPE_AP &&
2190
sdata->vif.type != NL80211_IFTYPE_ADHOC)
2193
/* verify action & smps_control are present */
2194
if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2197
switch (mgmt->u.action.u.ht_smps.action) {
2198
case WLAN_HT_ACTION_SMPS: {
2199
struct ieee80211_supported_band *sband;
2202
/* convert to HT capability */
2203
switch (mgmt->u.action.u.ht_smps.smps_control) {
2204
case WLAN_HT_SMPS_CONTROL_DISABLED:
2205
smps = WLAN_HT_CAP_SM_PS_DISABLED;
2207
case WLAN_HT_SMPS_CONTROL_STATIC:
2208
smps = WLAN_HT_CAP_SM_PS_STATIC;
2210
case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2211
smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2216
smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2218
/* if no change do nothing */
2219
if ((rx->sta->sta.ht_cap.cap &
2220
IEEE80211_HT_CAP_SM_PS) == smps)
2223
rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2224
rx->sta->sta.ht_cap.cap |= smps;
2226
sband = rx->local->hw.wiphy->bands[status->band];
2228
rate_control_rate_update(local, sband, rx->sta,
2229
IEEE80211_RC_SMPS_CHANGED);
2237
case WLAN_CATEGORY_BACK:
2238
if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2239
sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2240
sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2241
sdata->vif.type != NL80211_IFTYPE_AP &&
2242
sdata->vif.type != NL80211_IFTYPE_ADHOC)
2245
/* verify action_code is present */
2246
if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2249
switch (mgmt->u.action.u.addba_req.action_code) {
2250
case WLAN_ACTION_ADDBA_REQ:
2251
if (len < (IEEE80211_MIN_ACTION_SIZE +
2252
sizeof(mgmt->u.action.u.addba_req)))
2255
case WLAN_ACTION_ADDBA_RESP:
2256
if (len < (IEEE80211_MIN_ACTION_SIZE +
2257
sizeof(mgmt->u.action.u.addba_resp)))
2260
case WLAN_ACTION_DELBA:
2261
if (len < (IEEE80211_MIN_ACTION_SIZE +
2262
sizeof(mgmt->u.action.u.delba)))
2270
case WLAN_CATEGORY_SPECTRUM_MGMT:
2271
if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2274
if (sdata->vif.type != NL80211_IFTYPE_STATION)
2277
/* verify action_code is present */
2278
if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2281
switch (mgmt->u.action.u.measurement.action_code) {
2282
case WLAN_ACTION_SPCT_MSR_REQ:
2283
if (len < (IEEE80211_MIN_ACTION_SIZE +
2284
sizeof(mgmt->u.action.u.measurement)))
2286
ieee80211_process_measurement_req(sdata, mgmt, len);
2288
case WLAN_ACTION_SPCT_CHL_SWITCH:
2289
if (len < (IEEE80211_MIN_ACTION_SIZE +
2290
sizeof(mgmt->u.action.u.chan_switch)))
2293
if (sdata->vif.type != NL80211_IFTYPE_STATION)
2296
if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2302
case WLAN_CATEGORY_SA_QUERY:
2303
if (len < (IEEE80211_MIN_ACTION_SIZE +
2304
sizeof(mgmt->u.action.u.sa_query)))
2307
switch (mgmt->u.action.u.sa_query.action) {
2308
case WLAN_ACTION_SA_QUERY_REQUEST:
2309
if (sdata->vif.type != NL80211_IFTYPE_STATION)
2311
ieee80211_process_sa_query_req(sdata, mgmt, len);
2315
case WLAN_CATEGORY_SELF_PROTECTED:
2316
switch (mgmt->u.action.u.self_prot.action_code) {
2317
case WLAN_SP_MESH_PEERING_OPEN:
2318
case WLAN_SP_MESH_PEERING_CLOSE:
2319
case WLAN_SP_MESH_PEERING_CONFIRM:
2320
if (!ieee80211_vif_is_mesh(&sdata->vif))
2322
if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2323
/* userspace handles this frame */
2326
case WLAN_SP_MGK_INFORM:
2327
case WLAN_SP_MGK_ACK:
2328
if (!ieee80211_vif_is_mesh(&sdata->vif))
2333
case WLAN_CATEGORY_MESH_ACTION:
2334
if (!ieee80211_vif_is_mesh(&sdata->vif))
2336
if (mesh_action_is_path_sel(mgmt) &&
2337
(!mesh_path_sel_is_hwmp(sdata)))
2345
status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2346
/* will return in the next handlers */
2351
rx->sta->rx_packets++;
2352
dev_kfree_skb(rx->skb);
2356
rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2357
skb_queue_tail(&sdata->skb_queue, rx->skb);
2358
ieee80211_queue_work(&local->hw, &sdata->work);
2360
rx->sta->rx_packets++;
2364
static ieee80211_rx_result debug_noinline
2365
ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2367
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2370
/* skip known-bad action frames and return them in the next handler */
2371
if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2375
* Getting here means the kernel doesn't know how to handle
2376
* it, but maybe userspace does ... include returned frames
2377
* so userspace can register for those to know whether ones
2378
* it transmitted were processed or returned.
2381
if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2382
sig = status->signal;
2384
if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2385
rx->skb->data, rx->skb->len,
2388
rx->sta->rx_packets++;
2389
dev_kfree_skb(rx->skb);
2397
static ieee80211_rx_result debug_noinline
2398
ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2400
struct ieee80211_local *local = rx->local;
2401
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2402
struct sk_buff *nskb;
2403
struct ieee80211_sub_if_data *sdata = rx->sdata;
2404
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2406
if (!ieee80211_is_action(mgmt->frame_control))
2410
* For AP mode, hostapd is responsible for handling any action
2411
* frames that we didn't handle, including returning unknown
2412
* ones. For all other modes we will return them to the sender,
2413
* setting the 0x80 bit in the action category, as required by
2414
* 802.11-2012 9.24.4.
2415
* Newer versions of hostapd shall also use the management frame
2416
* registration mechanisms, but older ones still use cooked
2417
* monitor interfaces so push all frames there.
2419
if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2420
(sdata->vif.type == NL80211_IFTYPE_AP ||
2421
sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2422
return RX_DROP_MONITOR;
2424
if (is_multicast_ether_addr(mgmt->da))
2425
return RX_DROP_MONITOR;
2427
/* do not return rejected action frames */
2428
if (mgmt->u.action.category & 0x80)
2429
return RX_DROP_UNUSABLE;
2431
nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2434
struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2436
nmgmt->u.action.category |= 0x80;
2437
memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2438
memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2440
memset(nskb->cb, 0, sizeof(nskb->cb));
2442
ieee80211_tx_skb(rx->sdata, nskb);
2444
dev_kfree_skb(rx->skb);
2448
static ieee80211_rx_result debug_noinline
2449
ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2451
struct ieee80211_sub_if_data *sdata = rx->sdata;
2452
struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2455
stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2457
if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2458
sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2459
sdata->vif.type != NL80211_IFTYPE_STATION)
2460
return RX_DROP_MONITOR;
2463
case cpu_to_le16(IEEE80211_STYPE_AUTH):
2464
case cpu_to_le16(IEEE80211_STYPE_BEACON):
2465
case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2466
/* process for all: mesh, mlme, ibss */
2468
case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2469
case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2470
case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2471
case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2472
if (is_multicast_ether_addr(mgmt->da) &&
2473
!is_broadcast_ether_addr(mgmt->da))
2474
return RX_DROP_MONITOR;
2476
/* process only for station */
2477
if (sdata->vif.type != NL80211_IFTYPE_STATION)
2478
return RX_DROP_MONITOR;
2480
case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2481
/* process only for ibss */
2482
if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2483
return RX_DROP_MONITOR;
2486
return RX_DROP_MONITOR;
2489
/* queue up frame and kick off work to process it */
2490
rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2491
skb_queue_tail(&sdata->skb_queue, rx->skb);
2492
ieee80211_queue_work(&rx->local->hw, &sdata->work);
2494
rx->sta->rx_packets++;
2499
/* TODO: use IEEE80211_RX_FRAGMENTED */
2500
static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2501
struct ieee80211_rate *rate)
2503
struct ieee80211_sub_if_data *sdata;
2504
struct ieee80211_local *local = rx->local;
2505
struct sk_buff *skb = rx->skb, *skb2;
2506
struct net_device *prev_dev = NULL;
2507
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2508
int needed_headroom;
2511
* If cooked monitor has been processed already, then
2512
* don't do it again. If not, set the flag.
2514
if (rx->flags & IEEE80211_RX_CMNTR)
2516
rx->flags |= IEEE80211_RX_CMNTR;
2518
/* If there are no cooked monitor interfaces, just free the SKB */
2519
if (!local->cooked_mntrs)
2522
/* room for the radiotap header based on driver features */
2523
needed_headroom = ieee80211_rx_radiotap_len(local, status);
2525
if (skb_headroom(skb) < needed_headroom &&
2526
pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2529
/* prepend radiotap information */
2530
ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2533
skb_set_mac_header(skb, 0);
2534
skb->ip_summed = CHECKSUM_UNNECESSARY;
2535
skb->pkt_type = PACKET_OTHERHOST;
2536
skb->protocol = htons(ETH_P_802_2);
2538
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2539
if (!ieee80211_sdata_running(sdata))
2542
if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2543
!(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2547
skb2 = skb_clone(skb, GFP_ATOMIC);
2549
skb2->dev = prev_dev;
2550
netif_receive_skb(skb2);
2554
prev_dev = sdata->dev;
2555
sdata->dev->stats.rx_packets++;
2556
sdata->dev->stats.rx_bytes += skb->len;
2560
skb->dev = prev_dev;
2561
netif_receive_skb(skb);
2569
static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2570
ieee80211_rx_result res)
2573
case RX_DROP_MONITOR:
2574
I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2576
rx->sta->rx_dropped++;
2579
struct ieee80211_rate *rate = NULL;
2580
struct ieee80211_supported_band *sband;
2581
struct ieee80211_rx_status *status;
2583
status = IEEE80211_SKB_RXCB((rx->skb));
2585
sband = rx->local->hw.wiphy->bands[status->band];
2586
if (!(status->flag & RX_FLAG_HT))
2587
rate = &sband->bitrates[status->rate_idx];
2589
ieee80211_rx_cooked_monitor(rx, rate);
2592
case RX_DROP_UNUSABLE:
2593
I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2595
rx->sta->rx_dropped++;
2596
dev_kfree_skb(rx->skb);
2599
I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2604
static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2606
ieee80211_rx_result res = RX_DROP_MONITOR;
2607
struct sk_buff *skb;
2609
#define CALL_RXH(rxh) \
2612
if (res != RX_CONTINUE) \
2616
spin_lock(&rx->local->rx_skb_queue.lock);
2617
if (rx->local->running_rx_handler)
2620
rx->local->running_rx_handler = true;
2622
while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2623
spin_unlock(&rx->local->rx_skb_queue.lock);
2626
* all the other fields are valid across frames
2627
* that belong to an aMPDU since they are on the
2628
* same TID from the same station
2632
CALL_RXH(ieee80211_rx_h_decrypt)
2633
CALL_RXH(ieee80211_rx_h_check_more_data)
2634
CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2635
CALL_RXH(ieee80211_rx_h_sta_process)
2636
CALL_RXH(ieee80211_rx_h_defragment)
2637
CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2638
/* must be after MMIC verify so header is counted in MPDU mic */
2639
#ifdef CONFIG_MAC80211_MESH
2640
if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2641
CALL_RXH(ieee80211_rx_h_mesh_fwding);
2643
CALL_RXH(ieee80211_rx_h_amsdu)
2644
CALL_RXH(ieee80211_rx_h_data)
2645
CALL_RXH(ieee80211_rx_h_ctrl);
2646
CALL_RXH(ieee80211_rx_h_mgmt_check)
2647
CALL_RXH(ieee80211_rx_h_action)
2648
CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2649
CALL_RXH(ieee80211_rx_h_action_return)
2650
CALL_RXH(ieee80211_rx_h_mgmt)
2653
ieee80211_rx_handlers_result(rx, res);
2654
spin_lock(&rx->local->rx_skb_queue.lock);
2658
rx->local->running_rx_handler = false;
2661
spin_unlock(&rx->local->rx_skb_queue.lock);
2664
static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2666
ieee80211_rx_result res = RX_DROP_MONITOR;
2668
#define CALL_RXH(rxh) \
2671
if (res != RX_CONTINUE) \
2675
CALL_RXH(ieee80211_rx_h_check)
2677
ieee80211_rx_reorder_ampdu(rx);
2679
ieee80211_rx_handlers(rx);
2683
ieee80211_rx_handlers_result(rx, res);
2689
* This function makes calls into the RX path, therefore
2690
* it has to be invoked under RCU read lock.
2692
void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2694
struct ieee80211_rx_data rx = {
2696
.sdata = sta->sdata,
2697
.local = sta->local,
2698
/* This is OK -- must be QoS data frame */
2699
.security_idx = tid,
2703
struct tid_ampdu_rx *tid_agg_rx;
2705
tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2709
spin_lock(&tid_agg_rx->reorder_lock);
2710
ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2711
spin_unlock(&tid_agg_rx->reorder_lock);
2713
ieee80211_rx_handlers(&rx);
2716
/* main receive path */
2718
static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2719
struct ieee80211_hdr *hdr)
2721
struct ieee80211_sub_if_data *sdata = rx->sdata;
2722
struct sk_buff *skb = rx->skb;
2723
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2724
u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2725
int multicast = is_multicast_ether_addr(hdr->addr1);
2727
switch (sdata->vif.type) {
2728
case NL80211_IFTYPE_STATION:
2729
if (!bssid && !sdata->u.mgd.use_4addr)
2732
!ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2733
if (!(sdata->dev->flags & IFF_PROMISC) ||
2734
sdata->u.mgd.use_4addr)
2736
status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2739
case NL80211_IFTYPE_ADHOC:
2742
if (ieee80211_is_beacon(hdr->frame_control)) {
2744
} else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2746
} else if (!multicast &&
2747
!ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2748
if (!(sdata->dev->flags & IFF_PROMISC))
2750
status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2751
} else if (!rx->sta) {
2753
if (status->flag & RX_FLAG_HT)
2754
rate_idx = 0; /* TODO: HT rates */
2756
rate_idx = status->rate_idx;
2757
ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2761
case NL80211_IFTYPE_MESH_POINT:
2763
!ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
2764
if (!(sdata->dev->flags & IFF_PROMISC))
2767
status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2770
case NL80211_IFTYPE_AP_VLAN:
2771
case NL80211_IFTYPE_AP:
2773
if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2775
} else if (!ieee80211_bssid_match(bssid,
2778
* Accept public action frames even when the
2779
* BSSID doesn't match, this is used for P2P
2780
* and location updates. Note that mac80211
2781
* itself never looks at these frames.
2783
if (ieee80211_is_public_action(hdr, skb->len))
2785
if (!ieee80211_is_beacon(hdr->frame_control))
2787
status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2790
case NL80211_IFTYPE_WDS:
2791
if (bssid || !ieee80211_is_data(hdr->frame_control))
2793
if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
2797
/* should never get here */
2806
* This function returns whether or not the SKB
2807
* was destined for RX processing or not, which,
2808
* if consume is true, is equivalent to whether
2809
* or not the skb was consumed.
2811
static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2812
struct sk_buff *skb, bool consume)
2814
struct ieee80211_local *local = rx->local;
2815
struct ieee80211_sub_if_data *sdata = rx->sdata;
2816
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2817
struct ieee80211_hdr *hdr = (void *)skb->data;
2821
status->rx_flags |= IEEE80211_RX_RA_MATCH;
2822
prepares = prepare_for_handlers(rx, hdr);
2828
skb = skb_copy(skb, GFP_ATOMIC);
2830
if (net_ratelimit())
2831
wiphy_debug(local->hw.wiphy,
2832
"failed to copy skb for %s\n",
2840
ieee80211_invoke_rx_handlers(rx);
2845
* This is the actual Rx frames handler. as it blongs to Rx path it must
2846
* be called with rcu_read_lock protection.
2848
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2849
struct sk_buff *skb)
2851
struct ieee80211_local *local = hw_to_local(hw);
2852
struct ieee80211_sub_if_data *sdata;
2853
struct ieee80211_hdr *hdr;
2855
struct ieee80211_rx_data rx;
2856
struct ieee80211_sub_if_data *prev;
2857
struct sta_info *sta, *tmp, *prev_sta;
2860
fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2861
memset(&rx, 0, sizeof(rx));
2865
if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2866
local->dot11ReceivedFragmentCount++;
2868
if (ieee80211_is_mgmt(fc))
2869
err = skb_linearize(skb);
2871
err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2878
hdr = (struct ieee80211_hdr *)skb->data;
2879
ieee80211_parse_qos(&rx);
2880
ieee80211_verify_alignment(&rx);
2882
if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
2883
ieee80211_is_beacon(hdr->frame_control)))
2884
ieee80211_scan_rx(local, skb);
2886
if (ieee80211_is_data(fc)) {
2889
for_each_sta_info(local, hdr->addr2, sta, tmp) {
2896
rx.sdata = prev_sta->sdata;
2897
ieee80211_prepare_and_rx_handle(&rx, skb, false);
2904
rx.sdata = prev_sta->sdata;
2906
if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2914
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2915
if (!ieee80211_sdata_running(sdata))
2918
if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2919
sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2923
* frame is destined for this interface, but if it's
2924
* not also for the previous one we handle that after
2925
* the loop to avoid copying the SKB once too much
2933
rx.sta = sta_info_get_bss(prev, hdr->addr2);
2935
ieee80211_prepare_and_rx_handle(&rx, skb, false);
2941
rx.sta = sta_info_get_bss(prev, hdr->addr2);
2944
if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2953
* This is the receive path handler. It is called by a low level driver when an
2954
* 802.11 MPDU is received from the hardware.
2956
void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2958
struct ieee80211_local *local = hw_to_local(hw);
2959
struct ieee80211_rate *rate = NULL;
2960
struct ieee80211_supported_band *sband;
2961
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2963
WARN_ON_ONCE(softirq_count() == 0);
2965
if (WARN_ON(status->band < 0 ||
2966
status->band >= IEEE80211_NUM_BANDS))
2969
sband = local->hw.wiphy->bands[status->band];
2970
if (WARN_ON(!sband))
2974
* If we're suspending, it is possible although not too likely
2975
* that we'd be receiving frames after having already partially
2976
* quiesced the stack. We can't process such frames then since
2977
* that might, for example, cause stations to be added or other
2978
* driver callbacks be invoked.
2980
if (unlikely(local->quiescing || local->suspended))
2983
/* We might be during a HW reconfig, prevent Rx for the same reason */
2984
if (unlikely(local->in_reconfig))
2988
* The same happens when we're not even started,
2989
* but that's worth a warning.
2991
if (WARN_ON(!local->started))
2994
if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
2996
* Validate the rate, unless a PLCP error means that
2997
* we probably can't have a valid rate here anyway.
3000
if (status->flag & RX_FLAG_HT) {
3002
* rate_idx is MCS index, which can be [0-76]
3005
* http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3007
* Anything else would be some sort of driver or
3008
* hardware error. The driver should catch hardware
3011
if (WARN((status->rate_idx < 0 ||
3012
status->rate_idx > 76),
3013
"Rate marked as an HT rate but passed "
3014
"status->rate_idx is not "
3015
"an MCS index [0-76]: %d (0x%02x)\n",
3020
if (WARN_ON(status->rate_idx < 0 ||
3021
status->rate_idx >= sband->n_bitrates))
3023
rate = &sband->bitrates[status->rate_idx];
3027
status->rx_flags = 0;
3030
* key references and virtual interfaces are protected using RCU
3031
* and this requires that we are in a read-side RCU section during
3032
* receive processing
3037
* Frames with failed FCS/PLCP checksum are not returned,
3038
* all other frames are returned without radiotap header
3039
* if it was previously present.
3040
* Also, frames with less than 16 bytes are dropped.
3042
skb = ieee80211_rx_monitor(local, skb, rate);
3048
ieee80211_tpt_led_trig_rx(local,
3049
((struct ieee80211_hdr *)skb->data)->frame_control,
3051
__ieee80211_rx_handle_packet(hw, skb);
3059
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32))
3060
EXPORT_SYMBOL(ieee80211_rx);
3062
EXPORT_SYMBOL(mac80211_ieee80211_rx);
3066
/* This is a version of the rx handler that can be called from hard irq
3067
* context. Post the skb on the queue and schedule the tasklet */
3068
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3070
struct ieee80211_local *local = hw_to_local(hw);
3072
BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3074
skb->pkt_type = IEEE80211_RX_MSG;
3075
skb_queue_tail(&local->skb_queue, skb);
3076
tasklet_schedule(&local->tasklet);
3078
EXPORT_SYMBOL(ieee80211_rx_irqsafe);