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mac80211: IBSS fix scan request

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In case of wide bandwidth (wider than 20MHz) used by IBSS,
scan all channels in chandef to be able to find neighboring
IBSS netwqworks that use the same overall channels but a different
control channel.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Janusz.Dziedzic@tieto.com
2015-03-20 06:37:00 +01:00
committed by Johannes Berg
parent 97ffe75791
commit 76bed0f43b
3 changed files with 97 additions and 12 deletions
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81
net/mac80211/ibss.c
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@@ -1270,7 +1270,7 @@ static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
NULL, scan_width);
NULL, 0, scan_width);
}
static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
@@ -1307,6 +1307,76 @@ static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
capability, 0, true);
}
static unsigned ibss_setup_channels(struct wiphy *wiphy,
struct ieee80211_channel **channels,
unsigned int channels_max,
u32 center_freq, u32 width)
{
struct ieee80211_channel *chan = NULL;
unsigned int n_chan = 0;
u32 start_freq, end_freq, freq;
if (width <= 20) {
start_freq = center_freq;
end_freq = center_freq;
} else {
start_freq = center_freq - width / 2 + 10;
end_freq = center_freq + width / 2 - 10;
}
for (freq = start_freq; freq <= end_freq; freq += 20) {
chan = ieee80211_get_channel(wiphy, freq);
if (!chan)
continue;
if (n_chan >= channels_max)
return n_chan;
channels[n_chan] = chan;
n_chan++;
}
return n_chan;
}
static unsigned int
ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy,
const struct cfg80211_chan_def *chandef,
struct ieee80211_channel **channels,
unsigned int channels_max)
{
unsigned int n_chan = 0;
u32 width, cf1, cf2 = 0;
switch (chandef->width) {
case NL80211_CHAN_WIDTH_40:
width = 40;
break;
case NL80211_CHAN_WIDTH_80P80:
cf2 = chandef->center_freq2;
/* fall through */
case NL80211_CHAN_WIDTH_80:
width = 80;
break;
case NL80211_CHAN_WIDTH_160:
width = 160;
break;
default:
width = 20;
break;
}
cf1 = chandef->center_freq1;
n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width);
if (cf2)
n_chan += ibss_setup_channels(wiphy, &channels[n_chan],
channels_max - n_chan, cf2,
width);
return n_chan;
}
/*
* This function is called with state == IEEE80211_IBSS_MLME_SEARCH
*/
@@ -1372,11 +1442,18 @@ static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
/* Selected IBSS not found in current scan results - try to scan */
if (time_after(jiffies, ifibss->last_scan_completed +
IEEE80211_SCAN_INTERVAL)) {
struct ieee80211_channel *channels[8];
unsigned int num;
sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
&ifibss->chandef,
channels,
ARRAY_SIZE(channels));
scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
ieee80211_request_ibss_scan(sdata, ifibss->ssid,
ifibss->ssid_len, chan,
ifibss->ssid_len, channels, num,
scan_width);
} else {
int interval = IEEE80211_SCAN_INTERVAL;