diff --git a/headers/posix/netinet/in.h b/headers/posix/netinet/in.h
index 0e16b70f1f..9d050f1664 100644
--- a/headers/posix/netinet/in.h
+++ b/headers/posix/netinet/in.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009, Haiku, Inc. All Rights Reserved.
+ * Copyright 2002-2010, Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _NETINET_IN_H_
@@ -139,10 +139,16 @@ struct group_source_req {
 #define MCAST_JOIN_SOURCE_GROUP		22	/* group_source_req */
 #define MCAST_LEAVE_SOURCE_GROUP	23	/* group_source_req */
 
+/* IPPROTO_IPV6 options */
 #define IPV6_MULTICAST_IF			24	/* int */
 #define IPV6_MULTICAST_HOPS			25	/* int */
 #define IPV6_MULTICAST_LOOP			26	/* int */
 
+#define IPV6_UNICAST_HOPS			27	/* int */
+#define IPV6_JOIN_GROUP				28	/* struct ipv6_mreq */
+#define IPV6_LEAVE_GROUP			29	/* struct ipv6_mreq */
+#define IPV6_V6ONLY					30	/* int */
+
 #define INADDR_ANY					((in_addr_t)0x00000000)
 #define INADDR_LOOPBACK				((in_addr_t)0x7f000001)
 #define INADDR_BROADCAST			((in_addr_t)0xffffffff)	/* must be masked */
diff --git a/headers/posix/netinet6/in6.h b/headers/posix/netinet6/in6.h
index b8db2dd316..a17beb13ed 100644
--- a/headers/posix/netinet6/in6.h
+++ b/headers/posix/netinet6/in6.h
@@ -36,6 +36,12 @@ extern const struct in6_addr in6addr_any;
 extern const struct in6_addr in6addr_loopback;
 
 
+struct ipv6_mreq {
+	struct in6_addr ipv6mr_multiaddr;
+	unsigned	ipv6mr_interface;
+};
+
+
 /* Non-standard helper defines (same as in FreeBSD, though) */
 #define __IPV6_ADDR_SCOPE_NODELOCAL			0x01
 #define __IPV6_ADDR_SCOPE_INTFACELOCAL		0x01