diff --git a/src/igmpgen.c b/src/igmpgen.c
index ac4d189..984ee59 100644
--- a/src/igmpgen.c
+++ b/src/igmpgen.c
@@ -1,6 +1,27 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <libnet.h>
+#include <netinet/igmp.h>
+
+/* Structure to represent IGMP extra information */
+struct igmp_extra {
+    u_int8_t igmp_version;
+    char *igmp_tag;
+    u_int8_t igmp_type;             /* IGMP type */
+    u_int8_t igmp_code;             /* routing code */
+    char *igmp_dst;
+    int group_override_dst;
+} g_igmp_pkts[] = {
+    /* name,  type (or version+type), code */
+    { 1, "query",  0x11, 0, "224.0.0.1", 0 },
+    { 1, "report", 0x12, 0, "224.0.0.1", 1 },
+    { 1, "dvmrp",  0x13, 0, "224.0.0.1", 0 },
+    { 2, "query",  0x11, 1, "224.0.0.1", 0 },
+    { 2, "report", 0x16, 1, "224.0.0.2", 1 },
+    { 2, "leave",  0x17, 1, "224.0.0.2", 0 },
+    { 0, 0, 0, 0 },
+};
 
 void usage(char *name)
 {
@@ -12,7 +33,6 @@ int main(int argc, char **argv)
     /* misc */
     int c;                      
     char *device = NULL;
-
     printf("IGMP packet generator\n\n");
 
     printf("Parsing command line...\n");
@@ -35,6 +55,7 @@ int main(int argc, char **argv)
         usage(argv[0]);
         exit(EXIT_FAILURE);
     }
+
     printf("done\n");
 
     return 0;