P2P: Fix PD retry channel on join-a-group case

Join-a-group needs to force the current operating channel of the target
group as the frequency to use for the PD exchange. When the channel was
selected based on a BSS entry for the GO, this worked only for the first
PD Request frame while the retries reverted to a potentially different
channel based on a P2P peer entry. Fix this by maintaining the forced
channel through the PD retry sequence.

Signed-hostap: Jouni Malinen <j@w1.fi>

src/p2p/p2p.c

@@ -2664,7 +2664,8 @@ static void p2p_retry_pd(struct p2p_data *p2p)
 			MAC2STR(dev->info.p2p_device_addr),
 			dev->req_config_methods);
 		p2p_send_prov_disc_req(p2p, dev,
-				       dev->flags & P2P_DEV_PD_FOR_JOIN, 0);
+				       dev->flags & P2P_DEV_PD_FOR_JOIN,
+				       p2p->pd_force_freq);
 		return;
 	}
 }

src/p2p/p2p_i.h

@@ -442,6 +442,14 @@ struct p2p_data {
 	 */
 	int pd_retries;
 
+	/**
+	 * pd_force_freq - Forced frequency for PD retries or 0 to auto-select
+	 *
+	 * This is is used during PD retries for join-a-group case to use the
+	 * correct operating frequency determined from a BSS entry for the GO.
+	 */
+	int pd_force_freq;
+
 	u8 go_timeout;
 	u8 client_timeout;
 

src/p2p/p2p_pd.c

@@ -437,6 +437,7 @@ int p2p_prov_disc_req(struct p2p_data *p2p, const u8 *peer_addr,
 	}
 
 	p2p->user_initiated_pd = user_initiated_pd;
+	p2p->pd_force_freq = force_freq;
 
 	if (p2p->user_initiated_pd)
 		p2p->pd_retries = MAX_PROV_DISC_REQ_RETRIES;
@@ -472,4 +473,5 @@ void p2p_reset_pending_pd(struct p2p_data *p2p)
 	p2p->user_initiated_pd = 0;
 	os_memset(p2p->pending_pd_devaddr, 0, ETH_ALEN);
 	p2p->pd_retries = 0;
+	p2p->pd_force_freq = 0;
 }