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diff --git a/sys/netinet6/in6.h b/sys/netinet6/in6.h
new file mode 100644
index 00000000000..46bebc06b2e
--- /dev/null
+++ b/sys/netinet6/in6.h
@@ -0,0 +1,393 @@
+/*
+%%% copyright-nrl-95
+This software is Copyright 1995-1998 by Randall Atkinson, Ronald Lee,
+Daniel McDonald, Bao Phan, and Chris Winters. All Rights Reserved. All
+rights under this copyright have been assigned to the US Naval Research
+Laboratory (NRL). The NRL Copyright Notice and License Agreement Version
+1.1 (January 17, 1995) applies to this software.
+You should have received a copy of the license with this software. If you
+didn't get a copy, you may request one from <license@ipv6.nrl.navy.mil>.
+
+*/
+
+#ifndef _NETINET6_IN6_H
+#define _NETINET6_IN6_H 1
+
+#if !defined(_NETINET_IN_H) && !defined(_NETINET_IN_H_)
+#error in6.h should no longer be included directly; include <netinet/in.h>
+#endif /* !defined(_NETINET_IN_H) && !defined(_NETINET_IN_H_) */
+#if __bsdi__ && !defined(_BSDI_VERSION)
+#include <sys/param.h>
+#endif /* __bsdi__ && !defined(_BSDI_VERSION) */
+
+/*
+ * Next header types (called Protocols in netinet/in.h).
+ */
+
+#define IPPROTO_HOPOPTS		0	/* Hop-by-hop option header. */
+#define IPPROTO_IPV4		4	/* IPv4 in IPv6 (?!?) */
+#define IPPROTO_IPV6		41	/* IPv6 in IPv6 */
+#define IPPROTO_ROUTING		43	/* Routing header. */
+#define IPPROTO_FRAGMENT	44	/* Fragmentation/reassembly header. */
+#define IPPROTO_ESP		50	/* Encapsulating security payload. */
+#define IPPROTO_AH		51	/* Authentication header. */
+#define IPPROTO_ICMPV6		58      /* ICMP for IPv6 */
+#define IPPROTO_NONE		59	/* No next header */
+#define IPPROTO_DSTOPTS		60	/* Destination options header. */
+
+/*
+ * Following are TBD, and subject to change rapidly
+ */
+#define IPPROTO_RAW		255	/* Payload of unknown type? */
+#define IPPROTO_MAX		256	/* Upper bound for next header type. */
+
+/* IPPROTO type macros. */
+
+#define IS_PREFRAG(x)   ( (x)==IPPROTO_HOPOPTS || (x)==IPPROTO_ROUTING || \
+			 (x) == IPPROTO_DSTOPTS)
+#define IS_IPV6OPT(x)   ( (x)==IPPROTO_FRAGMENT || (x) == IPPROTO_AH || \
+			 IS_PRFRAG(x) )
+
+#if !defined(_BSDI_VERSION) || (_BSDI_VERSION < 199802)
+struct in6_addr
+{
+  union 
+    {
+      uint8_t bytes[16];
+      uint32_t words[4];
+    } in6a_u;
+#define in6a_words in6a_u.words
+#define s6_addr in6a_u.bytes
+};
+#endif /* !defined(_BSDI_VERSION) || (_BSDI_VERSION < 199802) */
+
+#if !defined(SIN6_LEN)
+struct sockaddr_in6 {
+#if __linux__
+  uint16_t sin6_family;
+#else /* __linux__ */
+#define SIN6_LEN
+  uint8_t sin6_len;
+  uint8_t sin6_family;
+#endif /* __linux__ */
+  uint16_t sin6_port;
+  uint32_t sin6_flowinfo;
+  struct in6_addr sin6_addr;
+};
+#endif /* !defined(SIN6_LEN) */
+
+#define CREATE_IPV6_MAPPED(v6, v4) { \
+	v6.in6a_words[0] = 0; \
+	v6.in6a_words[1] = 0; \
+	v6.in6a_words[2] = htonl(0xffff); \
+	v6.in6a_words[3] = v4; }
+
+#if 0 /* defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__) */
+#define IN6_ARE_ADDR_EQUAL(x, y) memcmp((x), (y), sizeof(struct in6_addr))
+#else /* defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__) */
+#define IN6_ARE_ADDR_EQUAL(x, y) ( \
+        (x)->in6a_words[0] == (y)->in6a_words[0] && \
+        (x)->in6a_words[1] == (y)->in6a_words[1] && \
+        (x)->in6a_words[2] == (y)->in6a_words[2] && \
+        (x)->in6a_words[3] == (y)->in6a_words[3])
+#endif /* defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__) */
+
+#ifndef IN6_IS_ADDR_UNSPECIFIED
+#define IN6_IS_ADDR_UNSPECIFIED(a) ( \
+        ((a)->in6a_words[0] == 0) && \
+        ((a)->in6a_words[1] == 0) && \
+        ((a)->in6a_words[2] == 0) && \
+        ((a)->in6a_words[3] == 0))
+
+#define IN6_IS_ADDR_LOOPBACK(a) ( \
+        ((a)->in6a_words[0] == 0) && \
+        ((a)->in6a_words[1] == 0) && \
+        ((a)->in6a_words[2] == 0) && \
+        ((a)->in6a_words[3] == htonl(1)))
+
+#define IN6_IS_ADDR_MULTICAST(a) ((a)->s6_addr[0] == 0xff)
+
+#define IN6_IS_ADDR_LINKLOCAL(a) \
+        (((a)->in6a_words[0] & htonl(0xffc00000)) == htonl(0xfe800000))
+
+#define IN6_IS_ADDR_SITELOCAL(a) \
+        (((a)->in6a_words[0] & htonl(0xffc00000)) == htonl(0xfec00000))
+
+#define IN6_IS_ADDR_V4MAPPED(a) ( \
+        ((a)->in6a_words[0] == 0) && \
+        ((a)->in6a_words[1] == 0) && \
+        ((a)->in6a_words[2] == htonl(0xffff)))
+
+#define IN6_IS_ADDR_V4COMPAT(a) ( \
+        ((a)->in6a_words[0] == 0) && \
+        ((a)->in6a_words[1] == 0) && \
+        ((a)->in6a_words[2] == 0) && \
+        ((a)->in6a_words[3] & htonl(0xfffffffe)))
+
+#define IN6_IS_ADDR_MC_NODELOCAL(a) \
+        (GET_IN6_MCASTSCOPE(*a) == IN6_INTRA_NODE)
+
+#define IN6_IS_ADDR_MC_LINKLOCAL(a) \
+        (GET_IN6_MCASTSCOPE(*a) == IN6_INTRA_LINK)
+
+#define IN6_IS_ADDR_MC_SITELOCAL(a) \
+        (GET_IN6_MCASTSCOPE(*a) == IN6_INTRA_SITE)
+
+#define IN6_IS_ADDR_MC_ORGLOCAL(a) \
+        (GET_IN6_MCASTSCOPE(*a) == IN6_INTRA_ORG)
+
+#define IN6_IS_ADDR_MC_COMMLOCAL(a) \
+        (GET_IN6_MCASTSCOPE(*a) == IN6_INTRA_COMM)
+
+#define IN6_IS_ADDR_MC_GLOBAL(a) \
+        (GET_IN6_MCASTSCOPE(*a) == IN6_GLOBAL)
+#endif /* IN6_IS_ADDR_UNSPECIFIED */
+
+/* NOTE:  IS_IN6_ALL* macros only check the 0x1 and 0x2 scoping levels.
+          The IN6 ROAD document doesn't say those are good for higher
+          scoping levels.
+*/
+
+#define IN6_INTRA_NODE 1  /*  intra-node scope */
+#define IN6_INTRA_LINK 2  /*  intra-link scope */
+/*            3  (unassigned)
+            4  (unassigned)
+*/
+#define IN6_INTRA_SITE 5  /* intra-site scope */
+/*            6  (unassigned)
+            7  (unassigned)
+*/
+#define IN6_INTRA_ORG  8  /* intra-organization scope */
+/*            9  (unassigned)
+            A  (unassigned)
+*/
+#define IN6_INTRA_COMM 0xB/*  intra-community scope */
+/*            C  (unassigned)
+            D  (unassigned)
+*/
+
+#define IN6_GLOBAL   0xE  /* global scope*/
+/*            F  reserved
+*/
+
+#if BYTE_ORDER ==  BIG_ENDIAN
+
+#define SET_IN6_ALLNODES(a)  {(a).in6a_words[0]=0xff000000;(a).in6a_words[3]=1;\
+                              (a).in6a_words[1]=0;(a).in6a_words[2]=0;}
+#define SET_IN6_ALLROUTERS(a)  {(a).in6a_words[0]=0xff000000;(a).in6a_words[3]=2;\
+                              (a).in6a_words[1]=0;(a).in6a_words[2]=0;}
+
+#define SET_IN6_MCASTSCOPE(a,bits) {(a).in6a_words[0]&=0xfff0ffff;\
+                                    (a).in6a_words[0]|=(bits<<16);}
+#define GET_IN6_MCASTSCOPE(a) ( ((a).in6a_words[0] & 0x000f0000) >> 16  )
+
+#else   /* BYTE_ORDER == LITTLE_ENDIAN */
+
+#define SET_IN6_ALLNODES(a)  {(a).in6a_words[0]=0xff;(a).in6a_words[3]=0x01000000;\
+                              (a).in6a_words[1] = 0; (a).in6a_words[2] = 0;}
+#define SET_IN6_ALLROUTERS(a)  {(a).in6a_words[0]=0xff;(a).in6a_words[3]=0x02000000;\
+                              (a).in6a_words[1] = 0; (a).in6a_words[2] = 0;}
+
+#define SET_IN6_MCASTSCOPE(a,bits) {(a).in6a_words[0]&=0xfffff0ff;\
+                                    (a).in6a_words[0]|=(bits<<8);}
+#define GET_IN6_MCASTSCOPE(a)  ( ((a).in6a_words[0] & 0x00000f00) >>8)
+
+#endif  /* BYTE_ORDER == {BIG,LITTLE}_ENDIAN */
+
+/*
+ * Additonal type information.
+ */
+
+#if !defined(_BSDI_VERSION) || (_BSDI_VERSION < 199802)
+struct ipv6_mreq
+{
+  struct in6_addr ipv6mr_multiaddr;     /* Group addr. to join/leave. */
+  unsigned int ipv6mr_interface;     /* Interface on which to do it. */
+};
+#endif /* !defined(_BSDI_VERSION) || (_BSDI_VERSION < 199802) */
+
+/*
+ * IP options for IPv6.  Note I use the IPV6_* semantics for IPv6-
+ * specific options.  Another reason for the inclusion of <netinet/in.h> is
+ * for the options that are common between IPv6 and IPv4.
+ */
+
+#ifdef __linux__
+#define IPV6_ADDRFORM           1
+#define IPV6_PKTINFO            2
+#define IPV6_HOPOPTS            3
+#define IPV6_DSTOPTS            4
+#define IPV6_RTHDR              5
+#define IPV6_PKTOPTIONS         6
+#define IPV6_CHECKSUM           7
+#define IPV6_HOPLIMIT           8
+
+#define IPV6_UNICAST_HOPS       16
+#define IPV6_MULTICAST_IF       17
+#define IPV6_MULTICAST_HOPS     18
+#define IPV6_MULTICAST_LOOP     19
+#define IPV6_ADD_MEMBERSHIP     20
+#define IPV6_DROP_MEMBERSHIP    21
+#else /* __linux__ */
+#define	IPV6_OPTIONS		1    /* buf/ipv6_opts; set/get IP options */
+#define	IPV6_HDRINCL		2    /* int; header is included with data */
+#define	IPV6_TOS		3    /* int; IP type of service and preced. */
+#define	IPV6_UNICAST_HOPS	4    /* int; IPv6 unicast hop limit */
+#define IPV6_PKTINFO            5    /* struct in6_pktinfo: if. and addr */
+#define IPV6_HOPLIMIT		6    /* int; hop limit */
+#define IPV6_CHECKSUM		7    /* int: checksum offset */
+#define ICMPV6_FILTER		8    /* struct icmpv6_filter: type filter */
+#define	IPV6_MULTICAST_IF	9    /* u_int; set/get multicast interface */
+#define	IPV6_MULTICAST_HOPS	10   /* int; set/get multicast hop limit */
+#define	IPV6_MULTICAST_LOOP	11   /* u_int; set/get multicast loopback */
+#define	IPV6_ADD_MEMBERSHIP	12   /* ipv6_mreq; add group membership */
+#define	IPV6_DROP_MEMBERSHIP	13   /* ipv6_mreq; drop group membership */
+
+#define IPV6_ADDRFORM         0x16   /* int; get/set form of returned addrs */
+#define IPV6_HOPOPTS          0x19   /* int; receive hop-by-hop options */
+#define IPV6_DSTOPTS          0x1a   /* int; receive destination options */
+#define IPV6_RTHDR            0x1b   /* int; receive routing header */
+
+#define IN6_MAX_MEMBERSHIPS 20  /* Maximum number of multicast memberships. */
+#define IPV6_DEFAULT_MCAST_HOPS 1
+#define IPV6_DEFAULT_MCAST_LOOP 1
+
+/*
+ * Definitions for inet6 sysctl operations.
+ *
+ * Third level is protocol number.
+ * Fourth level is desired variable within that protocol.
+ */
+
+#define	IPV6PROTO_MAXID	(IPPROTO_ICMPV6 + 1)	/* don't list to IPPROTO_MAX. */
+
+#define	CTL_IPV6PROTO_NAMES { \
+	{ "ipv6", CTLTYPE_NODE }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ "ipv4", CTLTYPE_NODE }, \
+	{ 0, 0 }, \
+	{ "tcp", CTLTYPE_NODE }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ "udp", CTLTYPE_NODE }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ "esp", CTLTYPE_NODE }, \
+	{ "ah", CTLTYPE_NODE }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ 0, 0 }, \
+	{ "icmpv6", CTLTYPE_NODE }, \
+}
+ 
+/*
+ * Names for IPv6 sysctl objects
+ */
+
+#define	IPV6CTL_FORWARDING	1	/* act as router */
+#define	IPV6CTL_SENDREDIRECTS	2	/* may send redirects when forwarding */
+#define	IPV6CTL_DEFTTL		3	/* default TTL */
+#ifdef notyet
+#define	IPV6CTL_DEFMTU		4	/* default MTU */
+#endif
+#define	IPV6CTL_STATS		5
+#define	IPV6CTL_ROUTERSOLICIT	6
+#define	IPV6CTL_MAXID		7
+
+#define	IPV6CTL_NAMES { \
+	{ 0, 0 }, \
+	{ "forwarding", CTLTYPE_INT }, \
+	{ "redirect", CTLTYPE_INT }, \
+	{ "ttl", CTLTYPE_INT }, \
+	{ "mtu", CTLTYPE_INT }, \
+	{ "stats", CTLTYPE_STRUCT }, \
+	{ "routersolicit", CTLTYPE_INT }, \
+	{ 0, 0 }, \
+}
+
+#define IPV6CTL_VARS { \
+	0, \
+	&ipv6forwarding, \
+	0, \
+	&ipv6_defhoplmt, \
+	0, \
+	&ipv6rsolicit \
+}
+
+/* Cheesy hack for if net/route.h included... */
+#ifdef RTM_VERSION 
+/*
+ * sizeof(struct sockaddr_in6) > sizeof(struct sockaddr), therefore, I
+ * need to define... 
+ */ 
+struct route6
+{
+  struct  rtentry *ro_rt;
+  struct  sockaddr_in6 ro_dst;
+};
+#endif RTM_VERSION 
+
+#ifdef KERNEL
+/* Function prototypes go here. */
+int in6_cksum __P((struct mbuf *,int, u_int, u_int));
+#endif /* KERNEL */
+#endif /* __linux__ */
+
+extern const struct in6_addr in6addr_any;
+extern const struct in6_addr in6addr_loopback;
+
+#define IN6ADDR_ANY_INIT {{{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }}}
+#define IN6ADDR_LOOPBACK_INIT {{{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 }}}
+
+struct in6_pktinfo {
+  struct in6_addr ipi6_addr;
+  unsigned int ipi6_ifindex;
+};
+
+#define INET_ADDRSTRLEN 16
+#define INET6_ADDRSTRLEN 46
+
+#endif /* _NETINET6_IN6_H */