hostapd: enhance wifi reload

Add a radio_config_id property. If the radio config changes return an error
upon receiving the reconf call.

Signed-off-by: John Crispin <john@phrozen.org>

package/network/services/hostapd/patches/700-wifi-reload.patch

@@ -1,5 +1,7 @@
---- a/hostapd/config_file.c
-+++ b/hostapd/config_file.c
+Index: hostapd-2019-08-08-ca8c2bd2/hostapd/config_file.c
+===================================================================
+--- hostapd-2019-08-08-ca8c2bd2.orig/hostapd/config_file.c
++++ hostapd-2019-08-08-ca8c2bd2/hostapd/config_file.c
 @@ -2470,6 +2470,8 @@ static int hostapd_config_fill(struct ho
  		bss->isolate = atoi(pos);
  	} else if (os_strcmp(buf, "ap_max_inactivity") == 0) {
@@ -9,8 +11,19 @@
  	} else if (os_strcmp(buf, "skip_inactivity_poll") == 0) {
  		bss->skip_inactivity_poll = atoi(pos);
  	} else if (os_strcmp(buf, "country_code") == 0) {
---- a/src/ap/ap_config.c
-+++ b/src/ap/ap_config.c
+@@ -3131,6 +3133,8 @@ static int hostapd_config_fill(struct ho
+ 		}
+ 	} else if (os_strcmp(buf, "acs_exclude_dfs") == 0) {
+ 		conf->acs_exclude_dfs = atoi(pos);
++	} else if (os_strcmp(buf, "radio_config_id") == 0) {
++			conf->config_id = os_strdup(pos);
+ 	} else if (os_strcmp(buf, "channel") == 0) {
+ 		if (os_strcmp(pos, "acs_survey") == 0) {
+ #ifndef CONFIG_ACS
+Index: hostapd-2019-08-08-ca8c2bd2/src/ap/ap_config.c
+===================================================================
+--- hostapd-2019-08-08-ca8c2bd2.orig/src/ap/ap_config.c
++++ hostapd-2019-08-08-ca8c2bd2/src/ap/ap_config.c
 @@ -698,6 +698,7 @@ void hostapd_config_free_bss(struct host
  	os_free(conf->radius_req_attr_sqlite);
  	os_free(conf->rsn_preauth_interfaces);
@@ -19,8 +32,18 @@
  	os_free(conf->ca_cert);
  	os_free(conf->server_cert);
  	os_free(conf->server_cert2);
---- a/src/ap/ap_config.h
-+++ b/src/ap/ap_config.h
+@@ -881,6 +882,7 @@ void hostapd_config_free(struct hostapd_
+ 
+ 	for (i = 0; i < conf->num_bss; i++)
+ 		hostapd_config_free_bss(conf->bss[i]);
++	os_free(conf->config_id);
+ 	os_free(conf->bss);
+ 	os_free(conf->supported_rates);
+ 	os_free(conf->basic_rates);
+Index: hostapd-2019-08-08-ca8c2bd2/src/ap/ap_config.h
+===================================================================
+--- hostapd-2019-08-08-ca8c2bd2.orig/src/ap/ap_config.h
++++ hostapd-2019-08-08-ca8c2bd2/src/ap/ap_config.h
 @@ -829,6 +829,7 @@ struct hostapd_bss_config {
  	 */
  	u8 mka_psk_set;
@@ -29,9 +52,39 @@
  };
  
  /**
---- a/src/ap/hostapd.c
-+++ b/src/ap/hostapd.c
-@@ -242,13 +242,13 @@ int hostapd_reload_config(struct hostapd
+@@ -1012,6 +1013,7 @@ struct hostapd_config {
+ 	unsigned int airtime_update_interval;
+ #define AIRTIME_MODE_MAX (__AIRTIME_MODE_MAX - 1)
+ #endif /* CONFIG_AIRTIME_POLICY */
++	char *config_id;
+ };
+ 
+ 
+Index: hostapd-2019-08-08-ca8c2bd2/src/ap/hostapd.c
+===================================================================
+--- hostapd-2019-08-08-ca8c2bd2.orig/src/ap/hostapd.c
++++ hostapd-2019-08-08-ca8c2bd2/src/ap/hostapd.c
+@@ -206,6 +206,10 @@ static int hostapd_iface_conf_changed(st
+ {
+ 	size_t i;
+ 
++	if (newconf->config_id != oldconf->config_id)
++		if (strcmp(newconf->config_id, oldconf->config_id))
++			return 1;
++
+ 	if (newconf->num_bss != oldconf->num_bss)
+ 		return 1;
+ 
+@@ -219,7 +223,7 @@ static int hostapd_iface_conf_changed(st
+ }
+ 
+ 
+-int hostapd_reload_config(struct hostapd_iface *iface)
++int hostapd_reload_config(struct hostapd_iface *iface, int reconf)
+ {
+ 	struct hapd_interfaces *interfaces = iface->interfaces;
+ 	struct hostapd_data *hapd = iface->bss[0];
+@@ -242,13 +246,16 @@ int hostapd_reload_config(struct hostapd
  	if (newconf == NULL)
  		return -1;
  
@@ -42,12 +95,15 @@
  		char *fname;
  		int res;
  
++		if (reconf)
++			return -1;
++
 +		hostapd_clear_old(iface);
 +
  		wpa_printf(MSG_DEBUG,
  			   "Configuration changes include interface/BSS modification - force full disable+enable sequence");
  		fname = os_strdup(iface->config_fname);
-@@ -273,6 +273,22 @@ int hostapd_reload_config(struct hostapd
+@@ -273,6 +280,22 @@ int hostapd_reload_config(struct hostapd
  			wpa_printf(MSG_ERROR,
  				   "Failed to enable interface on config reload");
  		return res;
@@ -70,7 +126,7 @@
  	}
  	iface->conf = newconf;
  
-@@ -289,6 +305,12 @@ int hostapd_reload_config(struct hostapd
+@@ -289,6 +312,12 @@ int hostapd_reload_config(struct hostapd
  
  	for (j = 0; j < iface->num_bss; j++) {
  		hapd = iface->bss[j];
@@ -83,7 +139,7 @@
  		hapd->iconf = newconf;
  		hapd->conf = newconf->bss[j];
  		hostapd_reload_bss(hapd);
-@@ -2257,6 +2279,10 @@ hostapd_alloc_bss_data(struct hostapd_if
+@@ -2257,6 +2286,10 @@ hostapd_alloc_bss_data(struct hostapd_if
  	hapd->iconf = conf;
  	hapd->conf = bss;
  	hapd->iface = hapd_iface;
@@ -94,8 +150,19 @@
  	if (conf)
  		hapd->driver = conf->driver;
  	hapd->ctrl_sock = -1;
---- a/src/ap/hostapd.h
-+++ b/src/ap/hostapd.h
+Index: hostapd-2019-08-08-ca8c2bd2/src/ap/hostapd.h
+===================================================================
+--- hostapd-2019-08-08-ca8c2bd2.orig/src/ap/hostapd.h
++++ hostapd-2019-08-08-ca8c2bd2/src/ap/hostapd.h
+@@ -42,7 +42,7 @@ struct mesh_conf;
+ struct hostapd_iface;
+ 
+ struct hapd_interfaces {
+-	int (*reload_config)(struct hostapd_iface *iface);
++	int (*reload_config)(struct hostapd_iface *iface, int reconf);
+ 	struct hostapd_config * (*config_read_cb)(const char *config_fname);
+ 	int (*ctrl_iface_init)(struct hostapd_data *hapd);
+ 	void (*ctrl_iface_deinit)(struct hostapd_data *hapd);
 @@ -149,6 +149,7 @@ struct hostapd_data {
  	struct hostapd_config *iconf;
  	struct hostapd_bss_config *conf;
@@ -104,8 +171,19 @@
  	int interface_added; /* virtual interface added for this BSS */
  	unsigned int started:1;
  	unsigned int disabled:1;
---- a/src/drivers/driver_nl80211.c
-+++ b/src/drivers/driver_nl80211.c
+@@ -576,7 +577,7 @@ struct hostapd_iface {
+ int hostapd_for_each_interface(struct hapd_interfaces *interfaces,
+ 			       int (*cb)(struct hostapd_iface *iface,
+ 					 void *ctx), void *ctx);
+-int hostapd_reload_config(struct hostapd_iface *iface);
++int hostapd_reload_config(struct hostapd_iface *iface, int reconf);
+ void hostapd_reconfig_encryption(struct hostapd_data *hapd);
+ struct hostapd_data *
+ hostapd_alloc_bss_data(struct hostapd_iface *hapd_iface,
+Index: hostapd-2019-08-08-ca8c2bd2/src/drivers/driver_nl80211.c
+===================================================================
+--- hostapd-2019-08-08-ca8c2bd2.orig/src/drivers/driver_nl80211.c
++++ hostapd-2019-08-08-ca8c2bd2/src/drivers/driver_nl80211.c
 @@ -4295,6 +4295,9 @@ static int wpa_driver_nl80211_set_ap(voi
  	if (ret) {
  		wpa_printf(MSG_DEBUG, "nl80211: Beacon set failed: %d (%s)",
@@ -116,3 +194,42 @@
  	} else {
  		bss->beacon_set = 1;
  		nl80211_set_bss(bss, params->cts_protect, params->preamble,
+Index: hostapd-2019-08-08-ca8c2bd2/hostapd/ctrl_iface.c
+===================================================================
+--- hostapd-2019-08-08-ca8c2bd2.orig/hostapd/ctrl_iface.c
++++ hostapd-2019-08-08-ca8c2bd2/hostapd/ctrl_iface.c
+@@ -182,7 +182,7 @@ static int hostapd_ctrl_iface_update(str
+ 	iface->interfaces->config_read_cb = hostapd_ctrl_iface_config_read;
+ 	reload_opts = txt;
+ 
+-	hostapd_reload_config(iface);
++	hostapd_reload_config(iface, 0);
+ 
+ 	iface->interfaces->config_read_cb = config_read_cb;
+ }
+Index: hostapd-2019-08-08-ca8c2bd2/hostapd/main.c
+===================================================================
+--- hostapd-2019-08-08-ca8c2bd2.orig/hostapd/main.c
++++ hostapd-2019-08-08-ca8c2bd2/hostapd/main.c
+@@ -320,7 +320,7 @@ static void handle_term(int sig, void *s
+ 
+ static int handle_reload_iface(struct hostapd_iface *iface, void *ctx)
+ {
+-	if (hostapd_reload_config(iface) < 0) {
++	if (hostapd_reload_config(iface, 0) < 0) {
+ 		wpa_printf(MSG_WARNING, "Failed to read new configuration "
+ 			   "file - continuing with old.");
+ 	}
+Index: hostapd-2019-08-08-ca8c2bd2/src/ap/wps_hostapd.c
+===================================================================
+--- hostapd-2019-08-08-ca8c2bd2.orig/src/ap/wps_hostapd.c
++++ hostapd-2019-08-08-ca8c2bd2/src/ap/wps_hostapd.c
+@@ -275,7 +275,7 @@ static void wps_reload_config(void *eloo
+ 
+ 	wpa_printf(MSG_DEBUG, "WPS: Reload configuration data");
+ 	if (iface->interfaces == NULL ||
+-	    iface->interfaces->reload_config(iface) < 0) {
++	    iface->interfaces->reload_config(iface, 1) < 0) {
+ 		wpa_printf(MSG_WARNING, "WPS: Failed to reload the updated "
+ 			   "configuration");
+ 	}

package/network/services/hostapd/src/src/ap/ubus.c

@@ -152,8 +152,7 @@ hostapd_bss_reload(struct ubus_context *ctx, struct ubus_object *obj,
 		   struct blob_attr *msg)
 {
 	struct hostapd_data *hapd = container_of(obj, struct hostapd_data, ubus.obj);
-	hostapd_reload_config(hapd->iface);
-	hostapd_reload_iface(hapd->iface);
+	return hostapd_reload_config(hapd->iface, 1);
 }
 
 static int