MTU config

if_helper.c

@@ -24,6 +24,16 @@ int if_down(char *name) {
     return ret;
 }
 
+int if_mtu(char *name, int mtu) {
+    char buf[128];
+    snprintf(buf, sizeof(buf), "ifconfig %s mtu %d", name, mtu);
+    int ret = system(buf);
+    if (ret != 0) {
+        printf("Could set MTU for interface %s\n", name);
+    }
+    return ret;
+}
+
 int if_enable_ibss(char *name) {
     char buf[128];
     snprintf(buf, sizeof(buf), "iw %s set type ibss", name);

if_helper.h

@@ -3,6 +3,7 @@
 
 int if_up(char *name);
 int if_down(char *name);
+int if_mtu(char *name, int mtu);
 int if_promisc(char *name);
 int if_enable_ibss(char *name);
 int if_join_ibss(char *name, char *essid, int frequency);

main.c

@@ -40,7 +40,7 @@ int domainSocket;
 #define PROTOCOL_IDENTIFIER 0x9f77
 
 // Max payload length
-#define PAYLOAD_LENGTH 4096
+#define PAYLOAD_LENGTH 1500
 
 // ESSID and frequency for network
 #define ESSID "WiPacket"
@@ -358,6 +358,7 @@ void configureInterface() {
     if_down(if_name);
     if_enable_ibss(if_name);
     if_up(if_name);
+    if_mtu(if_name, PAYLOAD_LENGTH);
     if_join_ibss(if_name, essid, frequency);
     if_promisc(if_name);
 }