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DFS: Fix available channels list for VHT80 

Add a table of available VHT80 channels. This table contains the first
available channel. We will also choose this first channel as the control
one.

Signed-hostap: Janusz Dziedzic <janusz.dziedzic@tieto.com>
This commit is contained in:
Janusz Dziedzic 2013-10-26 16:25:41 +03:00 committed by Jouni Malinen
parent 34068ac3b1
commit 1dc17db34a
1 changed files with 30 additions and 6 deletions
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36
src/ap/dfs.c
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@ -55,13 +55,37 @@ static int dfs_channel_available(struct hostapd_channel_data *chan)
}
static int dfs_is_ht40_allowed(struct hostapd_channel_data *chan)
static int dfs_is_chan_allowed(struct hostapd_channel_data *chan, int n_chans)
{
int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
184, 192 };
unsigned int i;
/*
* The tables contain first valid channel number based on channel width.
* We will also choose this first channel as the control one.
*/
int allowed_40[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
184, 192 };
/*
* VHT80, valid channels based on center frequency:
* 42, 58, 106, 122, 138, 155
*/
int allowed_80[] = { 36, 52, 100, 116, 132, 149 };
int *allowed = allowed_40;
unsigned int i, allowed_no = 0;
for (i = 0; i < sizeof(allowed) / sizeof(allowed[0]); i++) {
switch (n_chans) {
case 2:
allowed = allowed_40;
allowed_no = sizeof(allowed_40) / sizeof(allowed_40[0]);
break;
case 4:
allowed = allowed_80;
allowed_no = sizeof(allowed_80) / sizeof(allowed_80[0]);
break;
default:
wpa_printf(MSG_DEBUG, "Unknown width for %d channels", n_chans);
break;
}
for (i = 0; i < allowed_no; i++) {
if (chan->chan == allowed[i])
return 1;
}
@ -92,7 +116,7 @@ static int dfs_find_channel(struct hostapd_data *hapd,
/* Skip HT40/VHT uncompatible channels */
if (hapd->iconf->ieee80211n &&
hapd->iconf->secondary_channel) {
if (!dfs_is_ht40_allowed(chan))
if (!dfs_is_chan_allowed(chan, n_chans))
continue;
for (j = 1; j < n_chans; j++) {