[PATCH 1/2] hostapd: fix dpp_listen in dpp responder scenario

Michal Kazior kazikcz at gmail.com
Tue Dec 15 04:34:54 EST 2020

From: Michal Kazior <michal at plume.com>

Some time ago it was found some drivers are
setting their hw/ucode rx filters restrictively
enough to prevent DPP multicast frames from being

A set of patches was introduced to the kernel and
ath9k driver as well as hostapd, eg.

  a39e9af90 ("nl80211: DPP listen mode callback")
  4d2ec436e ("DPP: Add driver operation for enabling/disabling listen mode")

The hostapd code itself was not calling the new
multicast registration. As such the AP side of
things wasn't working as expected in some

I've found this while trying to get ath9k working
as an AP Responder/Configurator.

The problem wasn't seen on, eg. mac80211 hwsim

Signed-off-by: Michal Kazior <michal at plume.com>
 src/ap/ap_drv_ops.c  | 8 ++++++++
 src/ap/ap_drv_ops.h  | 1 +
 src/ap/dpp_hostapd.c | 2 ++
 3 files changed, 11 insertions(+)

diff --git a/src/ap/ap_drv_ops.c b/src/ap/ap_drv_ops.c
index f15765945..d1642d7df 100644
--- a/src/ap/ap_drv_ops.c
+++ b/src/ap/ap_drv_ops.c
@@ -988,3 +988,11 @@ int hostapd_drv_update_dh_ie(struct hostapd_data *hapd, const u8 *peer,
 	return hapd->driver->update_dh_ie(hapd->drv_priv, peer, reason_code,
 					  ie, ielen);
+int hostapd_drv_dpp_listen(struct hostapd_data *hapd, bool enable)
+	if (!hapd->driver || !hapd->driver->dpp_listen || !hapd->drv_priv)
+		return 0;
+	return hapd->driver->dpp_listen(hapd->drv_priv, enable);
diff --git a/src/ap/ap_drv_ops.h b/src/ap/ap_drv_ops.h
index 0257c3a65..582ab61d8 100644
--- a/src/ap/ap_drv_ops.h
+++ b/src/ap/ap_drv_ops.h
@@ -134,6 +134,7 @@ int hostapd_start_dfs_cac(struct hostapd_iface *iface,
 int hostapd_drv_do_acs(struct hostapd_data *hapd);
 int hostapd_drv_update_dh_ie(struct hostapd_data *hapd, const u8 *peer,
 			     u16 reason_code, const u8 *ie, size_t ielen);
+int hostapd_drv_dpp_listen(struct hostapd_data *hapd, bool enable);
 #include "drivers/driver.h"
diff --git a/src/ap/dpp_hostapd.c b/src/ap/dpp_hostapd.c
index 6772a8748..42993b53e 100644
--- a/src/ap/dpp_hostapd.c
+++ b/src/ap/dpp_hostapd.c
@@ -661,12 +661,14 @@ int hostapd_dpp_listen(struct hostapd_data *hapd, const char *cmd)
 		return -1;
+	hostapd_drv_dpp_listen(hapd, true);
 	return 0;
 void hostapd_dpp_listen_stop(struct hostapd_data *hapd)
+	hostapd_drv_dpp_listen(hapd, false);
 	/* TODO: Stop listen operation on non-operating channel */

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