Significant namespace cleanup of netinet6 symbols.

One worrying bit is in icmp6.h where some htols() and htonl() are
added, which may affect compatibility down the line.  This component
can be reverted if issues show up.  Ports tree greps indicate no issue.

ok claudio mpi etc

1 files changed, 99 insertions, 202 deletions

diff --git a/sys/netinet6/in6.h b/sys/netinet6/in6.h
index 94e3cdf9070..b598c467592 100644
--- a/sys/netinet6/in6.h
+++ b/sys/netinet6/in6.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: in6.h,v 1.66 2013/10/21 12:27:15 deraadt Exp $	*/
+/*	$OpenBSD: in6.h,v 1.67 2013/10/24 11:20:18 deraadt Exp $	*/
 /*	$KAME: in6.h,v 1.83 2001/03/29 02:55:07 jinmei Exp $	*/
 
 /*
@@ -102,8 +102,8 @@ struct in6_addr {
  * Socket address for IPv6
  */
 #if __BSD_VISIBLE
-#define SIN6_LEN
-#endif
+#define SIN6_LEN	/* Indicates sockaddr_in6 has a sin6_len field */
+#endif /* __BSD_VISIBLE */
 struct sockaddr_in6 {
 	u_int8_t	sin6_len;	/* length of this struct(sa_family_t)*/
 	sa_family_t	sin6_family;	/* AF_INET6 (sa_family_t) */
@@ -113,6 +113,7 @@ struct sockaddr_in6 {
 	u_int32_t	sin6_scope_id;	/* intface scope id */
 };
 
+
 /*
  * Local definition for masks
  */
@@ -126,9 +127,7 @@ struct sockaddr_in6 {
 			    0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 }}}
 #define IN6MASK128	{{{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, \
 			    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }}}
-#endif
 
-#ifdef _KERNEL
 extern const struct sockaddr_in6 sa6_any;
 
 extern const struct in6_addr in6mask0;
@@ -138,35 +137,25 @@ extern const struct in6_addr in6mask96;
 extern const struct in6_addr in6mask128;
 #endif /* _KERNEL */
 
+/* Both kernel and libc define these for use */
+extern const struct in6_addr in6addr_any;
+extern const struct in6_addr in6addr_loopback;
+extern const struct in6_addr in6addr_intfacelocal_allnodes;
+extern const struct in6_addr in6addr_linklocal_allnodes;
+
+#if __BSD_VISIBLE
 /*
- * Macros started with IPV6_ADDR is KAME local
+ * IPv6 route structure
  */
-#ifdef _KERNEL	/* XXX nonstandard */
-#if BYTE_ORDER == BIG_ENDIAN
-#define IPV6_ADDR_INT32_ONE	1
-#define IPV6_ADDR_INT32_TWO	2
-#define IPV6_ADDR_INT32_MNL	0xff010000
-#define IPV6_ADDR_INT32_MLL	0xff020000
-#define IPV6_ADDR_INT32_SMP	0x0000ffff
-#define IPV6_ADDR_INT16_ULL	0xfe80
-#define IPV6_ADDR_INT16_USL	0xfec0
-#define IPV6_ADDR_INT16_MLL	0xff02
-#elif BYTE_ORDER == LITTLE_ENDIAN
-#define IPV6_ADDR_INT32_ONE	0x01000000
-#define IPV6_ADDR_INT32_TWO	0x02000000
-#define IPV6_ADDR_INT32_MNL	0x000001ff
-#define IPV6_ADDR_INT32_MLL	0x000002ff
-#define IPV6_ADDR_INT32_SMP	0xffff0000
-#define IPV6_ADDR_INT16_ULL	0x80fe
-#define IPV6_ADDR_INT16_USL	0xc0fe
-#define IPV6_ADDR_INT16_MLL	0x02ff
-#endif
-#endif
+struct route_in6 {
+	struct	rtentry *ro_rt;
+	u_long		 ro_tableid;	/* padded to long for alignment */
+	struct	sockaddr_in6 ro_dst;
+};
 
 /*
  * Definition of some useful macros to handle IP6 addresses
  */
-#if __BSD_VISIBLE
 #define IN6ADDR_ANY_INIT \
 	{{{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }}}
@@ -185,30 +174,23 @@ extern const struct in6_addr in6mask128;
 #define IN6ADDR_LINKLOCAL_ALLROUTERS_INIT \
 	{{{ 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 }}}
-#endif
 
-extern const struct in6_addr in6addr_any;
-extern const struct in6_addr in6addr_loopback;
-#if __BSD_VISIBLE
-extern const struct in6_addr in6addr_intfacelocal_allnodes;
-extern const struct in6_addr in6addr_linklocal_allnodes;
-#endif
+#define IN6_ARE_ADDR_EQUAL(a, b)			\
+    (memcmp(&(a)->s6_addr[0], &(b)->s6_addr[0], sizeof(struct in6_addr)) == 0)
+
+#endif /* __BSD_VISIBLE */
 
 /*
- * Equality
- * NOTE: Some of kernel programming environment (for example, OpenBSD/sparc)
- * does not supply memcmp().  For userland memcmp() is preferred as it is
- * in ANSI standard.
+ * Macros started with IPV6_ADDR is KAME local
  */
-#ifdef _KERNEL
-#define IN6_ARE_ADDR_EQUAL(a, b)			\
-    (bcmp(&(a)->s6_addr[0], &(b)->s6_addr[0], sizeof(struct in6_addr)) == 0)
-#else
-#if __BSD_VISIBLE
-#define IN6_ARE_ADDR_EQUAL(a, b)			\
-    (memcmp(&(a)->s6_addr[0], &(b)->s6_addr[0], sizeof(struct in6_addr)) == 0)
-#endif
-#endif
+#define __IPV6_ADDR_INT32_ONE	htonl(1)
+#define __IPV6_ADDR_INT32_TWO	htonl(2)
+#define __IPV6_ADDR_INT32_MNL	htonl(0xff010000)
+#define __IPV6_ADDR_INT32_MLL	htonl(0xff020000)
+#define __IPV6_ADDR_INT32_SMP	htonl(0x0000ffff)
+#define __IPV6_ADDR_INT16_ULL	htons(0xfe80)
+#define __IPV6_ADDR_INT16_USL	htons(0xfec0)
+#define __IPV6_ADDR_INT16_MLL	htons(0xff02)
 
 /*
  * Unspecified
@@ -226,7 +208,7 @@ extern const struct in6_addr in6addr_linklocal_allnodes;
 	((*(const u_int32_t *)(const void *)(&(a)->s6_addr[0]) == 0) &&	\
 	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[4]) == 0) &&	\
 	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[8]) == 0) &&	\
-	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[12]) == ntohl(1)))
+	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[12]) == __IPV6_ADDR_INT32_ONE))
 
 /*
  * IPv4 compatible
@@ -236,7 +218,7 @@ extern const struct in6_addr in6addr_linklocal_allnodes;
 	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[4]) == 0) &&	\
 	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[8]) == 0) &&	\
 	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[12]) != 0) &&	\
-	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[12]) != ntohl(1)))
+	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[12]) != __IPV6_ADDR_INT32_ONE))
 
 /*
  * Mapped
@@ -244,27 +226,7 @@ extern const struct in6_addr in6addr_linklocal_allnodes;
 #define IN6_IS_ADDR_V4MAPPED(a)		      \
 	((*(const u_int32_t *)(const void *)(&(a)->s6_addr[0]) == 0) &&	\
 	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[4]) == 0) &&	\
-	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[8]) == ntohl(0x0000ffff)))
-
-/*
- * KAME Scope Values
- */
-
-#ifdef _KERNEL	/* XXX nonstandard */
-#define IPV6_ADDR_SCOPE_NODELOCAL	0x01
-#define IPV6_ADDR_SCOPE_INTFACELOCAL	0x01
-#define IPV6_ADDR_SCOPE_LINKLOCAL	0x02
-#define IPV6_ADDR_SCOPE_SITELOCAL	0x05
-#define IPV6_ADDR_SCOPE_ORGLOCAL	0x08	/* just used in this file */
-#define IPV6_ADDR_SCOPE_GLOBAL		0x0e
-#else
-#define __IPV6_ADDR_SCOPE_NODELOCAL	0x01
-#define __IPV6_ADDR_SCOPE_INTFACELOCAL	0x01
-#define __IPV6_ADDR_SCOPE_LINKLOCAL	0x02
-#define __IPV6_ADDR_SCOPE_SITELOCAL	0x05
-#define __IPV6_ADDR_SCOPE_ORGLOCAL	0x08	/* just used in this file */
-#define __IPV6_ADDR_SCOPE_GLOBAL	0x0e
-#endif
+	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[8]) == __IPV6_ADDR_INT32_SMP))
 
 /*
  * Unicast Scope
@@ -278,37 +240,16 @@ extern const struct in6_addr in6addr_linklocal_allnodes;
 /*
  * Multicast
  */
+#define __IPV6_ADDR_MC_SCOPE(a)		((a)->s6_addr[1] & 0x0f)
 #define IN6_IS_ADDR_MULTICAST(a)	((a)->s6_addr[0] == 0xff)
 
-#ifdef _KERNEL	/* XXX nonstandard */
-#define IPV6_ADDR_MC_SCOPE(a)		((a)->s6_addr[1] & 0x0f)
-#else
-#define __IPV6_ADDR_MC_SCOPE(a)		((a)->s6_addr[1] & 0x0f)
-#endif
+#define __IPV6_ADDR_SCOPE_NODELOCAL	0x01
+#define __IPV6_ADDR_SCOPE_INTFACELOCAL	0x01
+#define __IPV6_ADDR_SCOPE_LINKLOCAL	0x02
+#define __IPV6_ADDR_SCOPE_SITELOCAL	0x05
+#define __IPV6_ADDR_SCOPE_ORGLOCAL	0x08	/* just used in this file */
+#define __IPV6_ADDR_SCOPE_GLOBAL	0x0e
 
-/*
- * Multicast Scope
- */
-#ifdef _KERNEL	/* refers nonstandard items */
-#define IN6_IS_ADDR_MC_NODELOCAL(a)	\
-	(IN6_IS_ADDR_MULTICAST(a) &&	\
-	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_NODELOCAL))
-#define IN6_IS_ADDR_MC_INTFACELOCAL(a)	\
-	(IN6_IS_ADDR_MULTICAST(a) &&	\
-	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_INTFACELOCAL))
-#define IN6_IS_ADDR_MC_LINKLOCAL(a)	\
-	(IN6_IS_ADDR_MULTICAST(a) &&	\
-	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_LINKLOCAL))
-#define IN6_IS_ADDR_MC_SITELOCAL(a)	\
-	(IN6_IS_ADDR_MULTICAST(a) && 	\
-	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_SITELOCAL))
-#define IN6_IS_ADDR_MC_ORGLOCAL(a)	\
-	(IN6_IS_ADDR_MULTICAST(a) &&	\
-	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_ORGLOCAL))
-#define IN6_IS_ADDR_MC_GLOBAL(a)	\
-	(IN6_IS_ADDR_MULTICAST(a) &&	\
-	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_GLOBAL))
-#else
 #define IN6_IS_ADDR_MC_NODELOCAL(a)	\
 	(IN6_IS_ADDR_MULTICAST(a) &&	\
 	 (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_NODELOCAL))
@@ -327,12 +268,8 @@ extern const struct in6_addr in6addr_linklocal_allnodes;
 #define IN6_IS_ADDR_MC_GLOBAL(a)	\
 	(IN6_IS_ADDR_MULTICAST(a) &&	\
 	 (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_GLOBAL))
-#endif
 
-#ifdef _KERNEL	/* nonstandard */
-/*
- * KAME Scope
- */
+#ifdef _KERNEL
 #define IN6_IS_SCOPE_LINKLOCAL(a)	\
 	((IN6_IS_ADDR_LINKLOCAL(a)) ||	\
 	 (IN6_IS_ADDR_MC_LINKLOCAL(a)))
@@ -349,33 +286,14 @@ extern const struct in6_addr in6addr_linklocal_allnodes;
 	((a)->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME && \
 	 (u_int32_t)((time_second - (a)->ia6_updatetime)) > \
 	 (a)->ia6_lifetime.ia6t_vltime)
-#endif
 
-/*
- * IP6 route structure
- */
-#if __BSD_VISIBLE
-struct route_in6 {
-	struct	rtentry *ro_rt;
-	u_long		 ro_tableid;	/* padded to long for alignment */
-	struct	sockaddr_in6 ro_dst;
-};
-#endif
+#endif /* _KERNEL */
 
 /*
  * Options for use with [gs]etsockopt at the IPV6 level.
  * First word of comment is data type; bool is stored in int.
  */
-#define IPV6_OPTIONS		1  /* buf/ip6_opts; set/get IP6 options */
-/* no hdrincl */
-#define IPV6_SOCKOPT_RESERVED1	3  /* reserved for future use */
 #define IPV6_UNICAST_HOPS	4  /* int; IP6 hops */
-#if 0 /* the followings are relic in IPv4 and hence are disabled */
-#define IPV6_RECVOPTS		5  /* bool; receive all IP6 opts w/dgram */
-#define IPV6_RECVRETOPTS	6  /* bool; receive IP6 opts for response */
-#define IPV6_RECVDSTADDR	7  /* bool; receive IP6 dst addr w/dgram */
-#define IPV6_RETOPTS		8  /* ip6_opts; set/get IP6 options */
-#endif
 #define IPV6_MULTICAST_IF	9  /* u_char; set/get IP6 multicast i/f */
 #define IPV6_MULTICAST_HOPS	10 /* u_char; set/get IP6 multicast hops */
 #define IPV6_MULTICAST_LOOP	11 /* u_char; set/get IP6 multicast loopback */
@@ -400,13 +318,6 @@ struct route_in6 {
 #define IPV6_CHECKSUM		26 /* int; checksum offset for raw socket */
 #define IPV6_V6ONLY		27 /* bool; make AF_INET6 sockets v6 only */
 
-#if 0 /*KAME IPSEC*/
-#define IPV6_IPSEC_POLICY	28 /* struct; get/set security policy */
-#endif
-#define IPV6_FAITH		29 /* bool; accept FAITH'ed connections */
-
-/* 30-34: reserved */
-
 /* new socket options introduced in RFC3542 */
 #define IPV6_RTHDRDSTOPTS	35 /* ip6_dest; send dst option before rthdr */
 
@@ -425,9 +336,7 @@ struct route_in6 {
 #define IPV6_PATHMTU		44 /* mtuinfo; get the current path MTU (sopt),
 				      4 bytes int; MTU notification (cmsg) */
 
-/* 45: reserved */
-
-/* more new socket options introduced in RFC3542 */
+/* More new socket options introduced in RFC3542 */
 #define IPV6_PKTINFO		46 /* in6_pktinfo; send if, src addr */
 #define IPV6_HOPLIMIT		47 /* int; send hop limit */
 #define IPV6_NEXTHOP		48 /* sockaddr; next hop addr */
@@ -435,7 +344,6 @@ struct route_in6 {
 #define IPV6_DSTOPTS		50 /* ip6_dest; send dst option befor rthdr */
 #define IPV6_RTHDR		51 /* ip6_rthdr; send routing header */
 
-/* 52: reserved */
 #define IPV6_AUTH_LEVEL		53   /* int; authentication used */
 #define IPV6_ESP_TRANS_LEVEL	54   /* int; transport encryption */
 #define IPV6_ESP_NETWORK_LEVEL	55   /* int; full-packet encryption */
@@ -443,7 +351,7 @@ struct route_in6 {
 #define IPSEC6_OUTSA		56   /* set the outbound SA for a socket */
 #endif
 #define IPV6_RECVTCLASS		57   /* bool; recv traffic class values */
-/* 58: reserved */
+
 #define IPV6_AUTOFLOWLABEL	59   /* bool; attach flowlabel automagically */
 #define IPV6_IPCOMP_LEVEL	60   /* int; compression */
 
@@ -456,10 +364,8 @@ struct route_in6 {
 #define IPV6_RTABLE		0x1021	/* int; routing table, see SO_RTABLE */
 
 /* to define items, should talk with KAME guys first, for *BSD compatibility */
-
-#define IPV6_RTHDR_LOOSE     0 /* this hop need not be a neighbor. XXX old spec */
-#define IPV6_RTHDR_STRICT    1 /* this hop must be a neighbor. XXX old spec */
-#define IPV6_RTHDR_TYPE_0    0 /* IPv6 routing header type 0 */
+#define IPV6_RTHDR_LOOSE	0	/* this hop need not be a neighbor */
+#define IPV6_RTHDR_TYPE_0	0	/* IPv6 routing header type 0 */
 
 /*
  * Defaults and limits for options
@@ -501,6 +407,58 @@ struct ip6_mtuinfo {
 #define	IPV6_PORTRANGE_HIGH	1	/* "high" - request firewall bypass */
 #define	IPV6_PORTRANGE_LOW	2	/* "low" - vouchsafe security */
 
+#ifdef __BSD_VISIBLE
+
+#ifndef	_SOCKLEN_T_DEFINED_
+#define	_SOCKLEN_T_DEFINED_
+typedef	__socklen_t	socklen_t;	/* length type for network syscalls */
+#endif
+
+#endif /* __BSD_VISIBLE */
+
+#ifdef _KERNEL
+struct cmsghdr;
+
+int	in6_cksum(struct mbuf *, u_int8_t, u_int32_t, u_int32_t);
+extern void in6_proto_cksum_out(struct mbuf *, struct ifnet *);
+int	in6_localaddr(struct in6_addr *);
+int	in6_addrscope(struct in6_addr *);
+struct	in6_ifaddr *in6_ifawithscope(struct ifnet *, struct in6_addr *, u_int);
+extern void in6_if_up(struct ifnet *);
+void 	in6_get_rand_ifid(struct ifnet *, struct in6_addr *);
+int	in6_mask2len(struct in6_addr *, u_char *);
+
+struct sockaddr;
+struct sockaddr_in6;
+struct ifaddr;
+struct in6_ifaddr;
+
+/*
+ * Convert between address family specific and general structs.
+ * Inline functions check the source type and are stricter than
+ * casts or defines.
+ */
+
+static __inline struct sockaddr_in6 *
+satosin6(struct sockaddr *sa)
+{
+	return ((struct sockaddr_in6 *)(sa));
+}
+
+static __inline struct sockaddr *
+sin6tosa(struct sockaddr_in6 *sin6)
+{
+	return ((struct sockaddr *)(sin6));
+}
+
+static __inline struct in6_ifaddr *
+ifatoia6(struct ifaddr *ifa)
+{
+	return ((struct in6_ifaddr *)(ifa));
+}
+
+#endif /* _KERNEL */
+
 #if __BSD_VISIBLE
 /*
  * Definitions for inet6 sysctl operations.
@@ -606,9 +564,6 @@ struct ip6_mtuinfo {
 #define IPV6CTL_FORWARDING	1	/* act as router */
 #define IPV6CTL_SENDREDIRECTS	2	/* may send redirects when forwarding*/
 #define IPV6CTL_DEFHLIM		3	/* default Hop-Limit */
-#ifdef notyet
-#define IPV6CTL_DEFMTU		4	/* default MTU */
-#endif
 #define IPV6CTL_FORWSRCRT	5	/* forward source-routed dgrams */
 #define IPV6CTL_STATS		6	/* stats */
 #define IPV6CTL_MRTSTATS	7	/* multicast forwarding stats */
@@ -622,13 +577,9 @@ struct ip6_mtuinfo {
 #define IPV6CTL_DAD_COUNT	16
 #define IPV6CTL_AUTO_FLOWLABEL	17
 #define IPV6CTL_DEFMCASTHLIM	18
-#ifdef notdef	/* obsolete */
-#define IPV6CTL_GIF_HLIM	19	/* default HLIM for gif encap packet */
-#endif
 #define IPV6CTL_KAME_VERSION	20
 #define IPV6CTL_USE_DEPRECATED	21	/* use deprecated addr (RFC2462 5.5.4) */
 #define IPV6CTL_RR_PRUNE	22	/* walk timer for router renumbering */
-/*#define IPV6CTL_MAPPED_ADDR	23	not for OpenBSD */
 #define IPV6CTL_V6ONLY		24
 /* 25 to 40: resrved */
 #define IPV6CTL_MAXFRAGS	41	/* max fragments */
@@ -651,7 +602,7 @@ struct ip6_mtuinfo {
 	{ "forwarding", CTLTYPE_INT }, \
 	{ "redirect", CTLTYPE_INT }, \
 	{ "hlim", CTLTYPE_INT }, \
-	{ "mtu", CTLTYPE_INT }, \
+	{ 0, 0 }, \
 	{ "forwsrcrt", CTLTYPE_INT }, \
 	{ 0, 0 }, \
 	{ 0, 0 }, \
@@ -754,57 +705,6 @@ struct ip6_mtuinfo {
 	NULL, \
 }
 
-#endif /* __BSD_VISIBLE */
-
-#ifdef _KERNEL
-struct cmsghdr;
-
-int	in6_cksum(struct mbuf *, u_int8_t, u_int32_t, u_int32_t);
-extern void in6_proto_cksum_out(struct mbuf *, struct ifnet *);
-int	in6_localaddr(struct in6_addr *);
-int	in6_addrscope(struct in6_addr *);
-struct	in6_ifaddr *in6_ifawithscope(struct ifnet *, struct in6_addr *, u_int);
-extern void in6_if_up(struct ifnet *);
-void 	in6_get_rand_ifid(struct ifnet *, struct in6_addr *);
-int	in6_mask2len(struct in6_addr *, u_char *);
-
-struct sockaddr;
-struct sockaddr_in6;
-struct ifaddr;
-struct in6_ifaddr;
-
-/*
- * Convert between address family specific and general structs.
- * Inline functions check the source type and are stricter than
- * casts or defines.
- */
-
-static __inline struct sockaddr_in6 *
-satosin6(struct sockaddr *sa)
-{
-	return ((struct sockaddr_in6 *)(sa));
-}
-
-static __inline struct sockaddr *
-sin6tosa(struct sockaddr_in6 *sin6)
-{
-	return ((struct sockaddr *)(sin6));
-}
-
-static __inline struct in6_ifaddr *
-ifatoia6(struct ifaddr *ifa)
-{
-	return ((struct in6_ifaddr *)(ifa));
-}
-#endif /* _KERNEL */
-
-#if __BSD_VISIBLE
-
-#ifndef	_SOCKLEN_T_DEFINED_
-#define	_SOCKLEN_T_DEFINED_
-typedef	__socklen_t	socklen_t;	/* length type for network syscalls */
-#endif
-
 __BEGIN_DECLS
 struct cmsghdr;
 
@@ -821,9 +721,6 @@ extern struct cmsghdr *inet6_rthdr_init(void *, int);
 extern int inet6_rthdr_add(struct cmsghdr *, const struct in6_addr *,
 		unsigned int);
 extern int inet6_rthdr_lasthop(struct cmsghdr *, unsigned int);
-#if 0 /* not implemented yet */
-extern int inet6_rthdr_reverse(const struct cmsghdr *, struct cmsghdr *);
-#endif
 extern int inet6_rthdr_segments(const struct cmsghdr *);
 extern struct in6_addr *inet6_rthdr_getaddr(struct cmsghdr *, int);
 extern int inet6_rthdr_getflags(const struct cmsghdr *, int);