feature: add ndp tool for ipv6 neighbor

tools/Makefile

@@ -1,4 +1,4 @@
-SUBDIRS=compat libutil libmemstat libxo libnetgraph sysctl ifconfig route top netstat ngctl ipfw arp traffic knictl
+SUBDIRS=compat libutil libmemstat libxo libnetgraph sysctl ifconfig route top netstat ngctl ipfw arp traffic knictl ndp
 PREFIX_BIN=/usr/local/bin
 
 all:
@@ -12,6 +12,7 @@ install:
 
 	cp -rf sbin/ ${PREFIX_BIN}/f-stack
 	ln -sf ${PREFIX_BIN}/f-stack/arp ${PREFIX_BIN}/ff_arp
+	ln -sf ${PREFIX_BIN}/f-stack/ndp ${PREFIX_BIN}/ff_ndp
 	ln -sf ${PREFIX_BIN}/f-stack/ifconfig ${PREFIX_BIN}/ff_ifconfig
 	ln -sf ${PREFIX_BIN}/f-stack/ipfw ${PREFIX_BIN}/ff_ipfw
 	ln -sf ${PREFIX_BIN}/f-stack/netstat ${PREFIX_BIN}/ff_netstat

tools/compat/if_indextoname.c

@@ -0,0 +1,54 @@
+#include <sys/cdefs.h>
+#ifndef FSTACK
+__FBSDID("$FreeBSD$");
+
+#include "namespace.h"
+#endif
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <ifaddrs.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#ifndef FSTACK
+#include "un-namespace.h"
+#endif
+
+char *
+if_indextoname(unsigned int ifindex, char *ifname)
+{
+	struct ifaddrs *ifaddrs, *ifa;
+	int error = 0;
+
+	if (ifindex == 0) {
+		errno = ENXIO;
+		return(NULL);
+	}
+
+	if (getifaddrs(&ifaddrs) < 0)
+		return(NULL);	/* getifaddrs properly set errno */
+
+	for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
+		if (ifa->ifa_addr &&
+		    ifa->ifa_addr->sa_family == AF_LINK &&
+		    ifindex == LLINDEX((struct sockaddr_dl*)ifa->ifa_addr))
+			break;
+	}
+
+	if (ifa == NULL) {
+		error = ENXIO;
+		ifname = NULL;
+	}
+	else
+		strncpy(ifname, ifa->ifa_name, IFNAMSIZ);
+
+	freeifaddrs(ifaddrs);
+
+	errno = error;
+	return(ifname);
+}
+

tools/ndp/Makefile

@@ -0,0 +1,22 @@
+# Copyright (c) 1996 WIDE Project. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modifications, are permitted provided that the above copyright notice
+# and this paragraph are duplicated in all such forms and that any
+# documentation, advertising materials, and other materials related to
+# such distribution and use acknowledge that the software was developed
+# by the WIDE Project, Japan. The name of the Project may not be used to
+# endorse or promote products derived from this software without
+# specific prior written permission. THIS SOFTWARE IS PROVIDED ``AS IS''
+# AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
+# LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE.
+# $FreeBSD: releng/11.0/usr.sbin/ndp/Makefile 201390 2010-01-02 11:07:44Z ed $
+
+
+TOPDIR?=${CURDIR}/../..
+
+PROG=ndp
+
+include ${TOPDIR}/tools/prog.mk
+