mesh: Make inactivity timer configurable

Current mesh code uses ap_max_inactivity as inactivity timer. This patch
makes it configurable.

There is another mesh inactivity timer in mac80211. The timer works even
if user_mpm=1. So this patch sets the max value to the timer for
workaround.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

src/drivers/driver.h

@@ -1040,6 +1040,7 @@ struct wpa_driver_mesh_bss_params {
 	 * See NL80211_MESHCONF_* for all the mesh config parameters.
 	 */
 	unsigned int flags;
+	int peer_link_timeout;
 };
 
 struct wpa_driver_mesh_join_params {

src/drivers/driver_nl80211.c

@@ -7821,6 +7821,7 @@ wpa_driver_nl80211_join_mesh(void *priv,
 	struct nl_msg *msg;
 	struct nlattr *container;
 	int ret = 0;
+	u32 timeout;
 
 	wpa_printf(MSG_DEBUG, "nl80211: mesh join (ifindex=%d)", drv->ifindex);
 	msg = nl80211_drv_msg(drv, 0, NL80211_CMD_JOIN_MESH);
@@ -7868,6 +7869,22 @@ wpa_driver_nl80211_join_mesh(void *priv,
 	    nla_put_u16(msg, NL80211_MESHCONF_MAX_PEER_LINKS,
 			params->max_peer_links))
 		goto fail;
+
+	/*
+	 * Set NL80211_MESHCONF_PLINK_TIMEOUT even if user mpm is used because
+	 * the timer could disconnect stations even in that case.
+	 *
+	 * Set 0xffffffff instead of 0 because NL80211_MESHCONF_PLINK_TIMEOUT
+	 * does not allow 0.
+	 */
+	timeout = params->conf.peer_link_timeout;
+	if ((params->flags & WPA_DRIVER_MESH_FLAG_USER_MPM) || timeout == 0)
+		timeout = 0xffffffff;
+	if (nla_put_u32(msg, NL80211_MESHCONF_PLINK_TIMEOUT, timeout)) {
+		wpa_printf(MSG_ERROR, "nl80211: Failed to set PLINK_TIMEOUT");
+		goto fail;
+	}
+
 	nla_nest_end(msg, container);
 
 	ret = send_and_recv_msgs(drv, msg, NULL, NULL);

wpa_supplicant/config.c

@@ -3476,6 +3476,7 @@ struct wpa_config * wpa_config_alloc_empty(const char *ctrl_interface,
 	config->ap_scan = DEFAULT_AP_SCAN;
 	config->user_mpm = DEFAULT_USER_MPM;
 	config->max_peer_links = DEFAULT_MAX_PEER_LINKS;
+	config->mesh_max_inactivity = DEFAULT_MESH_MAX_INACTIVITY;
 	config->fast_reauth = DEFAULT_FAST_REAUTH;
 	config->p2p_go_intent = DEFAULT_P2P_GO_INTENT;
 	config->p2p_intra_bss = DEFAULT_P2P_INTRA_BSS;
@@ -4026,6 +4027,7 @@ static const struct global_parse_data global_fields[] = {
 #ifdef CONFIG_MESH
 	{ INT(user_mpm), 0 },
 	{ INT_RANGE(max_peer_links, 0, 255), 0 },
+	{ INT(mesh_max_inactivity), 0 },
 #endif /* CONFIG_MESH */
 	{ INT(disable_scan_offload), 0 },
 	{ INT(fast_reauth), 0 },

wpa_supplicant/config.h

@@ -17,6 +17,7 @@
 #endif /* CONFIG_NO_SCAN_PROCESSING */
 #define DEFAULT_USER_MPM 1
 #define DEFAULT_MAX_PEER_LINKS 99
+#define DEFAULT_MESH_MAX_INACTIVITY 300
 #define DEFAULT_FAST_REAUTH 1
 #define DEFAULT_P2P_GO_INTENT 7
 #define DEFAULT_P2P_INTRA_BSS 1
@@ -1128,6 +1129,14 @@ struct wpa_config {
 	 * its certificate chain are included in EAP peer certificate events.
 	 */
 	int cert_in_cb;
+
+	/**
+	 * mesh_max_inactivity - Timeout in seconds to detect STA inactivity
+	 *
+	 * This timeout value is used in mesh STA to clean up inactive stations.
+	 * By default: 300 seconds.
+	 */
+	int mesh_max_inactivity;
 };
 
 

wpa_supplicant/config_file.c

@@ -1223,6 +1223,10 @@ static void wpa_config_write_global(FILE *f, struct wpa_config *config)
 
 	if (config->cert_in_cb != DEFAULT_CERT_IN_CB)
 		fprintf(f, "cert_in_cb=%d\n", config->cert_in_cb);
+
+	if (config->mesh_max_inactivity != DEFAULT_MESH_MAX_INACTIVITY)
+		fprintf(f, "mesh_max_inactivity=%d\n",
+			config->mesh_max_inactivity);
 }
 
 #endif /* CONFIG_NO_CONFIG_WRITE */

wpa_supplicant/mesh.c

@@ -166,6 +166,7 @@ static int wpa_supplicant_mesh_init(struct wpa_supplicant *wpa_s,
 	bss->conf = *conf->bss;
 	bss->conf->start_disabled = 1;
 	bss->conf->mesh = MESH_ENABLED;
+	bss->conf->ap_max_inactivity = wpa_s->conf->mesh_max_inactivity;
 	bss->iconf = conf;
 	ifmsh->conf = conf;
 
@@ -339,6 +340,7 @@ int wpa_supplicant_join_mesh(struct wpa_supplicant *wpa_s,
 		params.flags |= WPA_DRIVER_MESH_FLAG_DRIVER_MPM;
 		params.conf.flags |= WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
 	}
+	params.conf.peer_link_timeout = wpa_s->conf->mesh_max_inactivity;
 
 	if (wpa_supplicant_mesh_init(wpa_s, ssid)) {
 		wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh");

wpa_supplicant/wpa_supplicant.conf

@@ -127,6 +127,11 @@ ap_scan=1
 # Maximum number of mesh peering currently maintained by the STA.
 #max_peer_links=99
 
+# Timeout in seconds to detect STA inactivity (default: 300 seconds)
+#
+# This timeout value is used in mesh STA to clean up inactive stations.
+#mesh_max_inactivity=300
+
 # cert_in_cb - Whether to include a peer certificate dump in events
 # This controls whether peer certificates for authentication server and
 # its certificate chain are included in EAP peer certificate events. This is