eap: Load MTU settings from iwd.conf

src/eap.c

@@ -31,6 +31,7 @@
 
 #include "eap.h"
 
+static uint32_t default_mtu;
 struct l_queue *eap_methods;
 
 struct eap_state {
@@ -58,7 +59,7 @@ struct eap_state *eap_new(eap_tx_packet_func_t tx_packet,
 	eap = l_new(struct eap_state, 1);
 
 	eap->last_id = -1;
-	eap->mtu = 1024;
+	eap->mtu = default_mtu;
 
 	eap->tx_packet = tx_packet;
 	eap->complete = complete;
@@ -504,10 +505,20 @@ static void __eap_method_disable(struct eap_method_desc *start,
 extern struct eap_method_desc __start___eap[];
 extern struct eap_method_desc __stop___eap[];
 
-void eap_init(void)
+void eap_init(uint32_t mtu)
 {
 	eap_methods = l_queue_new();
 	__eap_method_enable(__start___eap, __stop___eap);
+
+	/*
+	 * RFC 3748, Section 3.1, [4], "Minimum MTU":
+	 * EAP is capable of functioning on lower layers that
+	 *        provide an EAP MTU size of 1020 octets or greater.
+	 */
+	if (mtu == 0)
+		default_mtu = 1020;
+	else
+		default_mtu = mtu;
 }
 
 void eap_exit(void)

src/eap.h

@@ -59,7 +59,7 @@ size_t eap_get_mtu(struct eap_state *eap);
 
 void eap_rx_packet(struct eap_state *eap, const uint8_t *pkt, size_t len);
 
-void eap_init(void);
+void eap_init(uint32_t default_mtu);
 void eap_exit(void);
 
 /* EAP method API */

src/eapol.c

@@ -1642,8 +1642,6 @@ bool eapol_init()
 {
 	state_machines = l_queue_new();
 
-	eap_init();
-
 	return true;
 }
 
@@ -1654,7 +1652,5 @@ bool eapol_exit()
 
 	l_queue_destroy(state_machines, eapol_sm_destroy);
 
-	eap_exit();
-
 	return true;
 }

src/main.c

@@ -37,6 +37,7 @@
 #include "src/wiphy.h"
 #include "src/dbus.h"
 #include "src/network.h"
+#include "src/eap.h"
 #include "src/eapol.h"
 #include "src/scan.h"
 #include "src/wsc.h"
@@ -145,6 +146,7 @@ int main(int argc, char *argv[])
 	struct l_genl *genl;
 	struct l_genl_family *nl80211;
 	char *config_path;
+	uint32_t eap_mtu;
 
 	for (;;) {
 		int opt;
@@ -244,6 +246,10 @@ int main(int argc, char *argv[])
 	l_genl_family_set_watches(nl80211, nl80211_appeared, nl80211_vanished,
 								nl80211, NULL);
 
+	if (!l_settings_get_uint(iwd_config, "EAP", "mtu", &eap_mtu))
+		eap_mtu = 1400; /* on WiFi the real MTU is around 2304 */
+
+	eap_init(eap_mtu);
 	eapol_init();
 	network_init();
 	known_networks_init();
@@ -256,6 +262,7 @@ int main(int argc, char *argv[])
 	known_networks_exit();
 	network_exit();
 	eapol_exit();
+	eap_exit();
 
 	l_genl_family_unref(nl80211);