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hostapd: Configure spectrum management capability

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Add configuration of Spectrum Management subfield in the Capability
Information of Beacon, Probe Response, and Association Response frames.
Spectrum Management bit is set when directly requested by new
configuration option spectrum_mgmt_required=1 or when AP is running on
DFS channels. In the future, also TPC shall require this bit to be set.

Signed-hostap: Srinivasan <srinivasanb@posedge.com>
Signed-hostap: Chaitanya T K <chaitanyatk@posedge.com>
Signed-hostap: Marek Puzyniak <marek.puzyniak@tieto.com>
This commit is contained in:
Chaitanya T K 2014-02-21 14:42:18 +01:00 • committed by Jouni Malinen
parent e0392f825d
commit 3d7ad2f681
8 changed files with 98 additions and 3 deletions
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41
src/ap/beacon.c
View file

@ -27,6 +27,7 @@
#include "ap_drv_ops.h"
#include "beacon.h"
#include "hs20.h"
#include "dfs.h"
#ifdef NEED_AP_MLME
@ -105,12 +106,43 @@ static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
{
u8 *pos = eid;
u8 local_pwr_constraint = 0;
int dfs;
if (hapd->iconf->local_pwr_constraint == -1 ||
hapd->iface->current_mode == NULL ||
if (hapd->iface->current_mode == NULL ||
hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
return eid;
/*
* There is no DFS support and power constraint was not directly
* requested by config option.
*/
if (!hapd->iconf->ieee80211h &&
hapd->iconf->local_pwr_constraint == -1)
return eid;
/* Check if DFS is required by regulatory. */
dfs = hostapd_is_dfs_required(hapd->iface);
if (dfs < 0) {
wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d",
dfs);
dfs = 0;
}
if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1)
return eid;
/*
* ieee80211h (DFS) is enabled so Power Constraint element shall
* be added when running on DFS channel whenever local_pwr_constraint
* is configured or not. In order to meet regulations when TPC is not
* implemented using a transmit power that is below the legal maximum
* (including any mitigation factor) should help. In this case,
* indicate 3 dB below maximum allowed transmit power.
*/
if (hapd->iconf->local_pwr_constraint == -1)
local_pwr_constraint = 3;
/*
* A STA that is not an AP shall use a transmit power less than or
* equal to the local maximum transmit power level for the channel.
@ -126,7 +158,10 @@ static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
/* Length */
*pos++ = 1;
/* Local Power Constraint */
*pos++ = hapd->iconf->local_pwr_constraint;
if (local_pwr_constraint)
*pos++ = local_pwr_constraint;
else
*pos++ = hapd->iconf->local_pwr_constraint;
return pos;
}