Release 4.11 net/mac80211/scan.c
/*
* Scanning implementation
*
* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
* Copyright 2004, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
* Copyright 2013-2015 Intel Mobile Communications GmbH
* Copyright 2016 Intel Deutschland GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <net/sch_generic.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "mesh.h"
#define IEEE80211_PROBE_DELAY (HZ / 33)
#define IEEE80211_CHANNEL_TIME (HZ / 33)
#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9)
void ieee80211_rx_bss_put(struct ieee80211_local *local,
struct ieee80211_bss *bss)
{
if (!bss)
return;
cfg80211_put_bss(local->hw.wiphy,
container_of((void *)bss, struct cfg80211_bss, priv));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Johannes Berg | 44 | 100.00% | 5 | 100.00% |
Total | 44 | 100.00% | 5 | 100.00% |
static bool is_uapsd_supported(struct ieee802_11_elems *elems)
{
u8 qos_info;
if (elems->wmm_info && elems->wmm_info_len == 7
&& elems->wmm_info[5] == 1)
qos_info = elems->wmm_info[6];
else if (elems->wmm_param && elems->wmm_param_len == 24
&& elems->wmm_param[5] == 1)
qos_info = elems->wmm_param[6];
else
/* no valid wmm information or parameter element found */
return false;
return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kalle Valo | 85 | 100.00% | 1 | 100.00% |
Total | 85 | 100.00% | 1 | 100.00% |
struct ieee80211_bss *
ieee80211_bss_info_update(struct ieee80211_local *local,
struct ieee80211_rx_status *rx_status,
struct ieee80211_mgmt *mgmt, size_t len,
struct ieee802_11_elems *elems,
struct ieee80211_channel *channel)
{
bool beacon = ieee80211_is_beacon(mgmt->frame_control);
struct cfg80211_bss *cbss;
struct ieee80211_bss *bss;
int clen, srlen;
struct cfg80211_inform_bss bss_meta = {
.boottime_ns = rx_status->boottime_ns,
};
bool signal_valid;
struct ieee80211_sub_if_data *scan_sdata;
if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
bss_meta.signal = rx_status->signal * 100;
else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20;
if (rx_status->flag & RX_FLAG_5MHZ)
bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5;
if (rx_status->flag & RX_FLAG_10MHZ)
bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;
bss_meta.chan = channel;
rcu_read_lock();
scan_sdata = rcu_dereference(local->scan_sdata);
if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
scan_sdata->vif.bss_conf.assoc &&
ieee80211_have_rx_timestamp(rx_status)) {
bss_meta.parent_tsf =
ieee80211_calculate_rx_timestamp(local, rx_status,
len + FCS_LEN, 24);
ether_addr_copy(bss_meta.parent_bssid,
scan_sdata->vif.bss_conf.bssid);
}
rcu_read_unlock();
cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
mgmt, len, GFP_ATOMIC);
if (!cbss)
return NULL;
/* In case the signal is invalid update the status */
signal_valid = abs(channel->center_freq - cbss->channel->center_freq)
<= local->hw.wiphy->max_adj_channel_rssi_comp;
if (!signal_valid)
rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
bss = (void *)cbss->priv;
if (beacon)
bss->device_ts_beacon = rx_status->device_timestamp;
else
bss->device_ts_presp = rx_status->device_timestamp;
if (elems->parse_error) {
if (beacon)
bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
else
bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
} else {
if (beacon)
bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
else
bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
}
/* save the ERP value so that it is available at association time */
if (elems->erp_info && (!elems->parse_error ||
!(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
bss->erp_value = elems->erp_info[0];
bss->has_erp_value = true;
if (!elems->parse_error)
bss->valid_data |= IEEE80211_BSS_VALID_ERP;
}
/* replace old supported rates if we get new values */
if (!elems->parse_error ||
!(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
srlen = 0;
if (elems->supp_rates) {
clen = IEEE80211_MAX_SUPP_RATES;
if (clen > elems->supp_rates_len)
clen = elems->supp_rates_len;
memcpy(bss->supp_rates, elems->supp_rates, clen);
srlen += clen;
}
if (elems->ext_supp_rates) {
clen = IEEE80211_MAX_SUPP_RATES - srlen;
if (clen > elems->ext_supp_rates_len)
clen = elems->ext_supp_rates_len;
memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
clen);
srlen += clen;
}
if (srlen) {
bss->supp_rates_len = srlen;
if (!elems->parse_error)
bss->valid_data |= IEEE80211_BSS_VALID_RATES;
}
}
if (!elems->parse_error ||
!(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
bss->wmm_used = elems->wmm_param || elems->wmm_info;
bss->uapsd_supported = is_uapsd_supported(elems);
if (!elems->parse_error)
bss->valid_data |= IEEE80211_BSS_VALID_WMM;
}
if (beacon) {
struct ieee80211_supported_band *sband =
local->hw.wiphy->bands[rx_status->band];
if (!(rx_status->flag & RX_FLAG_HT) &&
!(rx_status->flag & RX_FLAG_VHT))
bss->beacon_rate =
&sband->bitrates[rx_status->rate_idx];
}
return bss;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Johannes Berg | 316 | 45.47% | 10 | 52.63% |
Paul Stewart | 136 | 19.57% | 1 | 5.26% |
Avraham Stern | 79 | 11.37% | 1 | 5.26% |
Alexander Bondar | 58 | 8.35% | 1 | 5.26% |
Sara Sharon | 38 | 5.47% | 1 | 5.26% |
Simon Wunderlich | 29 | 4.17% | 1 | 5.26% |
Stanislaw Gruszka | 19 | 2.73% | 1 | 5.26% |
Emmanuel Grumbach | 10 | 1.44% | 1 | 5.26% |
Kalle Valo | 9 | 1.29% | 1 | 5.26% |
Rusty Russell | 1 | 0.14% | 1 | 5.26% |
Total | 695 | 100.00% | 19 | 100.00% |
void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
{
struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_sub_if_data *sdata1, *sdata2;
struct ieee80211_mgmt *mgmt = (void *)skb->data;
struct ieee80211_bss *bss;
u8 *elements;
struct ieee80211_channel *channel;
size_t baselen;
struct ieee802_11_elems elems;
if (skb->len < 24 ||
(!ieee80211_is_probe_resp(mgmt->frame_control) &&
!ieee80211_is_beacon(mgmt->frame_control)))
return;
sdata1 = rcu_dereference(local->scan_sdata);
sdata2 = rcu_dereference(local->sched_scan_sdata);
if (likely(!sdata1 && !sdata2))
return;
if (ieee80211_is_probe_resp(mgmt->frame_control)) {
struct cfg80211_scan_request *scan_req;
struct cfg80211_sched_scan_request *sched_scan_req;
scan_req = rcu_dereference(local->scan_req);
sched_scan_req = rcu_dereference(local->sched_scan_req);
/* ignore ProbeResp to foreign address unless scanning
* with randomised address
*/
if (!(sdata1 &&
(ether_addr_equal(mgmt->da, sdata1->vif.addr) ||
scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)) &&
!(sdata2 &&
(ether_addr_equal(mgmt->da, sdata2->vif.addr) ||
sched_scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)))
return;
elements = mgmt->u.probe_resp.variable;
baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
} else {
baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
elements = mgmt->u.beacon.variable;
}
if (baselen > skb->len)
return;
ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems);
channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
return;
bss = ieee80211_bss_info_update(local, rx_status,
mgmt, skb->len, &elems,
channel);
if (bss)
ieee80211_rx_bss_put(local, bss);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Johannes Berg | 348 | 98.58% | 9 | 81.82% |
Jouni Malinen | 4 | 1.13% | 1 | 9.09% |
Joe Perches | 1 | 0.28% | 1 | 9.09% |
Total | 353 | 100.00% | 11 | 100.00% |
static void
ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
enum nl80211_bss_scan_width scan_width)
{
memset(chandef, 0, sizeof(*chandef));
switch (scan_width) {
case NL80211_BSS_CHAN_WIDTH_5:
chandef->width = NL80211_CHAN_WIDTH_5;
break;
case NL80211_BSS_CHAN_WIDTH_10:
chandef->width = NL80211_CHAN_WIDTH_10;
break;
default:
chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
break;
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Simon Wunderlich | 62 | 100.00% | 1 | 100.00% |
Total | 62 | 100.00% | 1 | 100.00% |
/* return false if no more work */
static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
{
struct cfg80211_scan_request *req;
struct cfg80211_chan_def chandef;
u8 bands_used = 0;
int i, ielen, n_chans;
req = rcu_dereference_protected(local->scan_req,
lockdep_is_held(&local->mtx));
if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
return false;
if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
for (i = 0; i < req->n_channels; i++) {
local->hw_scan_req->req.channels[i] = req->channels[i];
bands_used |= BIT(req->channels[i]->band);
}
n_chans = req->n_channels;
} else {
do {
if (local->hw_scan_band == NUM_NL80211_BANDS)
return false;
n_chans = 0;
for (i = 0; i < req->n_channels; i++) {
if (req->channels[i]->band !=
local->hw_scan_band)
continue;
local->hw_scan_req->req.channels[n_chans] =
req->channels[i];
n_chans++;
bands_used |= BIT(req->channels[i]->band);
}
local->hw_scan_band++;
} while (!n_chans);
}
local->hw_scan_req->req.n_channels = n_chans;
ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
ielen = ieee80211_build_preq_ies(local,
(u8 *)local->hw_scan_req->req.ie,
local->hw_scan_ies_bufsize,
&local->hw_scan_req->ies,
req->ie, req->ie_len,
bands_used, req->rates, &chandef);
local->hw_scan_req->req.ie_len = ielen;
local->hw_scan_req->req.no_cck = req->no_cck;
ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
req->mac_addr_mask);
ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
return true;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Johannes Berg | 215 | 58.11% | 9 | 60.00% |
David Spinadel | 107 | 28.92% | 1 | 6.67% |
Jouni Malinen | 17 | 4.59% | 3 | 20.00% |
Simon Wunderlich | 16 | 4.32% | 1 | 6.67% |
Emmanuel Grumbach | 15 | 4.05% | 1 | 6.67% |
Total | 370 | 100.00% | 15 | 100.00% |
static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
{
struct ieee80211_local *local = hw_to_local(hw);
bool hw_scan = local->ops->hw_scan;
bool was_scanning = local->scanning;
struct cfg80211_scan_request *scan_req;
struct ieee80211_sub_if_data *scan_sdata;
struct ieee80211_sub_if_data *sdata;
lockdep_assert_held(&local->mtx);
/*
* It's ok to abort a not-yet-running scan (that
* we have one at all will be verified by checking
* local->scan_req next), but not to complete it
* successfully.
*/
if (WARN_ON(!local->scanning && !aborted))
aborted = true;
if (WARN_ON(!local->scan_req))
return;
if (hw_scan && !aborted &&
!ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
ieee80211_prep_hw_scan(local)) {
int rc;
rc = drv_hw_scan(local,
rcu_dereference_protected(local->scan_sdata,
lockdep_is_held(&local->mtx)),
local->hw_scan_req);
if (rc == 0)
return;
/* HW scan failed and is going to be reported as aborted,
* so clear old scan info.
*/
memset(&local->scan_info, 0, sizeof(local->scan_info));
aborted = true;
}
kfree(local->hw_scan_req);
local->hw_scan_req = NULL;
scan_req = rcu_dereference_protected(local->scan_req,
lockdep_is_held(&local->mtx));
if (scan_req != local->int_scan_req) {
local->scan_info.aborted = aborted;
cfg80211_scan_done(scan_req, &local->scan_info);
}
RCU_INIT_POINTER(local->scan_req, NULL);
scan_sdata = rcu_dereference_protected(local->scan_sdata,
lockdep_is_held(&local->mtx));
RCU_INIT_POINTER(local->scan_sdata, NULL);
local->scanning = 0;
local->scan_chandef.chan = NULL;
/* Set power back to normal operating levels. */
ieee80211_hw_config(local, 0);
if (!hw_scan) {
ieee80211_configure_filter(local);
drv_sw_scan_complete(local, scan_sdata);
ieee80211_offchannel_return(local);
}
ieee80211_recalc_idle(local);
ieee80211_mlme_notify_scan_completed(local);
ieee80211_ibss_notify_scan_completed(local);
/* Requeue all the work that might have been ignored while
* the scan was in progress; if there was none this will
* just be a no-op for the particular interface.
*/
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (ieee80211_sdata_running(sdata))
ieee80211_queue_work(&sdata->local->hw, &sdata->work);
}
if (was_scanning)
ieee80211_start_next_roc(local);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Johannes Berg | 241 | 64.96% | 25 | 64.10% |
Sachin Kulkarni | 34 | 9.16% | 1 | 2.56% |
Avraham Stern | 31 | 8.36% | 2 | 5.13% |
Eliad Peller | 22 | 5.93% | 2 | 5.13% |
Stanislaw Gruszka | 16 | 4.31% | 2 | 5.13% |
Ben Greear | 10 | 2.70% | 2 | 5.13% |
Luis R. Rodriguez | 5 | 1.35% | 1 | 2.56% |
David Spinadel | 5 | 1.35% | 1 | 2.56% |
Helmut Schaa | 3 | 0.81% | 1 | 2.56% |
Simon Wunderlich | 3 | 0.81% | 1 | 2.56% |
Monam Agarwal | 1 | 0.27% | 1 | 2.56% |
Total | 371 | 100.00% | 39 | 100.00% |
void ieee80211_scan_completed(struct ieee80211_hw *hw,
struct cfg80211_scan_info *info)
{
struct ieee80211_local *local = hw_to_local(hw);
trace_api_scan_completed(local, info->aborted);
set_bit(SCAN_COMPLETED, &local->scanning);
if (info->aborted)
set_bit(SCAN_ABORTED, &local->scanning);
memcpy(&local->scan_info, info, sizeof(*info));
ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Johannes Berg | 68 | 74.73% | 2 | 66.67% |
Avraham Stern | 23 | 25.27% | 1 | 33.33% |
Total | 91 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL(ieee80211_scan_completed);
static int ieee80211_start_sw_scan(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{
/* Software scan is not supported in multi-channel cases */
if (local->use_chanctx)
return -EOPNOTSUPP;
/*
* Hardware/driver doesn't support hw_scan, so use software
* scanning instead. First send a nullfunc frame with power save
* bit on so that AP will buffer the frames for us while we are not
* listening, then send probe requests to each channel and wait for
* the responses. After all channels are scanned, tune back to the
* original channel and send a nullfunc frame with power save bit
* off to trigger the AP to send us all the buffered frames.
*
* Note that while local->sw_scanning is true everything else but
* nullfunc frames and probe requests will be dropped in
* ieee80211_tx_h_check_assoc().
*/
drv_sw_scan_start(local, sdata, local->scan_addr);
local->leave_oper_channel_time = jiffies;
local->next_scan_state = SCAN_DECISION;
local->scan_channel_idx = 0;
ieee80211_offchannel_stop_vifs(local);
/* ensure nullfunc is transmitted before leaving operating channel */
ieee80211_flush_queues(local, NULL, false);
ieee80211_configure_filter(local);
/* We need to set power level at maximum rate for scanning. */
ieee80211_hw_config(local, 0);
ieee80211_queue_delayed_work(&local->hw,
&local->scan_work, 0);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Johannes Berg | 77 | 74.76% | 10 | 55.56% |
Ben Greear | 8 | 7.77% | 1 | 5.56% |
Helmut Schaa | 7 | 6.80% | 3 | 16.67% |
Seth Forshee | 6 | 5.83% | 1 | 5.56% |
Emmanuel Grumbach | 2 | 1.94% | 1 | 5.56% |
Luis R. Rodriguez | 2 | 1.94% | 1 | 5.56% |
Rajkumar Manoharan | 1 | 0.97% | 1 | 5.56% |
Total | 103 | 100.00% | 18 | 100.00% |
static bool ieee80211_can_scan(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{
if (ieee80211_is_radar_required(local))
return false;
if (!list_empty(&local->roc_list))
return false;
if (sdata->vif.type == NL80211_IFTYPE_STATION &&
sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
return false;
return true;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Stanislaw Gruszka | 55 | 83.33% | 1 | 25.00% |
Simon Wunderlich | 7 | 10.61% | 1 | 25.00% |
Eliad Peller | 3 | 4.55% | 1 | 25.00% |
Johannes Berg | 1 | 1.52% | 1 | 25.00% |
Total | 66 | 100.00% | 4 | 100.00% |
void ieee80211_run_deferred_scan(struct ieee80211_local *local)
{
lockdep_assert_held(&local->mtx);
if (!local->scan_req || local->scanning)
return;
if (!ieee80211_can_scan(local,
rcu_dereference_protected(
local->scan_sdata,
lockdep_is_held(&local->mtx))))
return;
ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
round_jiffies_relative(0));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Stanislaw Gruszka | 61 | 84.72% | 1 | 50.00% |
Johannes Berg | 11 | 15.28% | 1 | 50.00% |
Total | 72 | 100.00% | 2 | 100.00% |
static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
unsigned long *next_delay)
{
int i;
struct ieee80211_sub_if_data *sdata;
struct cfg80211_scan_request *scan_req;
enum nl80211_band band = local->hw.conf.chandef.chan->band;
u32 tx_flags;
scan_req = rcu_dereference_protected(local->scan_req,
lockdep_is_held(&local->mtx));
tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
if (scan_req->no_cck)
tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
sdata = rcu_dereference_protected(local->scan_sdata,
lockdep_is_held(&local->mtx));
for (i = 0; i < scan_req->n_ssids; i++)
ieee80211_send_probe_req(
sdata, local->scan_addr, scan_req->bssid,
scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
scan_req->ie, scan_req->ie_len,
scan_req->rates[band], false,
tx_flags, local->hw.conf.chandef.chan, true);
/*
* After sending probe requests, wait for probe responses
* on the channel.
*/
*next_delay = IEEE80211_CHANNEL_TIME;
local->next_scan_state = SCAN_DECISION;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Ben Greear | 105 | 56.76% | 1 | 10.00% |
Johannes Berg | 53 | 28.65% | 6 | 60.00% |
Seth Forshee | 18 | 9.73% | 1 | 10.00% |
Karl Beldan | 6 | 3.24% | 1 | 10.00% |
Jouni Malinen | 3 | 1.62% | 1 | 10.00% |
Total | 185 | 100.00% | 10 | 100.00% |
static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
struct cfg80211_scan_request *req)
{
struct ieee80211_local *local = sdata->local;
int rc;
lockdep_assert_held(&local->mtx);
if (local->scan_req || ieee80211_is_radar_required(local))
return -EBUSY;
if (!ieee80211_can_scan(local, sdata)) {
/* wait for the work to finish/time out */
rcu_assign_pointer(local->scan_req, req);
rcu_assign_pointer(local->scan_sdata, sdata);
return 0;
}
if (local->ops->hw_scan) {
u8 *ies;
local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
int i, n_bands = 0;
u8 bands_counted = 0;
for (i = 0; i < req->n_channels; i++) {
if (bands_counted & BIT(req->channels[i]->band))
continue;
bands_counted |= BIT(req->channels[i]->band);
n_bands++;
}
local->hw_scan_ies_bufsize *= n_bands;
}
local->hw_scan_req = kmalloc(
sizeof(*local->hw_scan_req) +
req->n_channels * sizeof(req->channels[0]) +
local->hw_scan_ies_bufsize, GFP_KERNEL);
if (!local->hw_scan_req)
return -ENOMEM;
local->hw_scan_req->req.ssids = req->ssids;
local->hw_scan_req->req.n_ssids = req->n_ssids;
ies = (u8 *)local->hw_scan_req +
sizeof(*local->hw_scan_req) +
req->n_channels * sizeof(req->channels[0]);
local->hw_scan_req->req.ie = ies;
local->hw_scan_req->req.flags = req->flags;
eth_broadcast_addr(local->hw_scan_req->req.bssid);
local->hw_scan_req->req.duration = req->duration;
local->hw_scan_req->req.duration_mandatory =
req->duration_mandatory;
local->hw_scan_band = 0;
/*
* After allocating local->hw_scan_req, we must
* go through until ieee80211_prep_hw_scan(), so
* anything that might be changed here and leave
* this function early must not go after this
* allocation.
*/
}
rcu_assign_pointer(local->scan_req, req);
rcu_assign_pointer(local->scan_sdata, sdata);
if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
get_random_mask_addr(local->scan_addr,
req->mac_addr,
req->mac_addr_mask);
else
memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
if (local->ops->hw_scan) {
__set_bit(SCAN_HW_SCANNING, &local->scanning);
} else if ((req->n_channels == 1) &&
(req->channels[0] == local->_oper_chandef.chan)) {
/*
* If we are scanning only on the operating channel
* then we do not need to stop normal activities
*/
unsigned long next_delay;
__set_bit(SCAN_ONCHANNEL_SCANNING, &local->