diff --git a/libctru/include/netinet/in.h b/libctru/include/netinet/in.h
index bc8d6f8..5d274b0 100644
--- a/libctru/include/netinet/in.h
+++ b/libctru/include/netinet/in.h
@@ -3,15 +3,25 @@
 #include <stdint.h>
 #include <sys/socket.h>
 
-#define INADDR_ANY		0x00000000
-#define INADDR_BROADCAST	0xFFFFFFFF
-#define INADDR_NONE		0xFFFFFFFF
+#define INADDR_ANY       0x00000000
+#define INADDR_BROADCAST 0xFFFFFFFF
+#define INADDR_NONE		 0xFFFFFFFF
 
 #define INET_ADDRSTRLEN		16
 
-//#define IPPROTO_IP		???
-//#define IPPROTO_TCP		???
-//#define IPPROTO_UDP		???
+/*
+ * Protocols (See RFC 1700 and the IANA)
+ */
+#define IPPROTO_IP          0               /* dummy for IP */
+#define IPPROTO_UDP        17               /* user datagram protocol */
+#define IPPROTO_TCP         6               /* tcp */
+
+#define	IP_TOS              7
+#define	IP_TTL              8
+#define IP_MULTICAST_LOOP   9
+#define	IP_MULTICAST_TTL   10
+#define	IP_ADD_MEMBERSHIP  11
+#define	IP_DROP_MEMBERSHIP 12
 
 typedef uint16_t in_port_t;
 typedef uint32_t in_addr_t;
@@ -26,3 +36,9 @@ struct sockaddr_in {
 	struct in_addr	sin_addr;
 	unsigned char	sin_zero[8];
 };
+
+/* Request struct for multicast socket ops */
+struct ip_mreq  {
+	struct in_addr imr_multiaddr;	/* IP multicast address of group */
+	struct in_addr imr_interface;	/* local IP address of interface */
+};
\ No newline at end of file