Sync with recent KAME.

This work was based on kame-20010528-freebsd43-snap.tgz and some
critical problem after the snap was out were fixed.
There are many many changes since last KAME merge.

TODO:
  - The definitions of SADB_* in sys/net/pfkeyv2.h are still different
    from RFC2407/IANA assignment because of binary compatibility
    issue.  It should be fixed under 5-CURRENT.
  - ip6po_m member of struct ip6_pktopts is no longer used.  But, it
    is still there because of binary compatibility issue.  It should
    be removed under 5-CURRENT.

Reviewed by:	itojun
Obtained from:	KAME
MFC after:	3 weeks

3 files changed, 77 insertions, 592 deletions

diff --git a/usr.sbin/prefix/Makefile b/usr.sbin/prefix/Makefile
index 4681577..69bd0e3 100644
--- a/usr.sbin/prefix/Makefile
+++ b/usr.sbin/prefix/Makefile
@@ -2,9 +2,10 @@
 #	$Id: Makefile,v 1.1.1.1 1999/08/08 23:31:13 itojun Exp $
 #	$FreeBSD$
 
-PROG=	prefix
 MAN=	prefix.8
 
-CFLAGS+=-DINET6
+realinstall:
+	${INSTALL} ${COPY} -o ${BINOWN} -g ${BINGRP} -m ${BINMODE} \
+	    ${.CURDIR}/prefix.sh ${DESTDIR}${BINDIR}/prefix
 
 .include <bsd.prog.mk>
diff --git a/usr.sbin/prefix/prefix.c b/usr.sbin/prefix/prefix.c
deleted file mode 100644
index 84fbf26..0000000
--- a/usr.sbin/prefix/prefix.c
+++ /dev/null
@@ -1,590 +0,0 @@
-/*
- * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
- * All rights reserved.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the project nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- * 
- * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $FreeBSD$
- */
-
-#include <sys/param.h>
-#include <sys/ioctl.h>
-#include <sys/socket.h>
-#include <sys/sysctl.h>
-#include <sys/time.h>
-
-#include <net/if.h>
-#if defined(__FreeBSD__) && __FreeBSD__ >= 3
-#include <net/if_var.h>
-#endif /* __FreeBSD__ >= 3 */
-#include <net/if_dl.h>
-#include <net/if_types.h>
-#include <net/route.h>
-
-#include <netinet/in.h>
-#include <netinet/in_var.h>
-#include <arpa/inet.h>
-#include <netdb.h>
-
-#include <ctype.h>
-#include <err.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#define DEF_ADVVALIDLIFETIME 2592000
-#define DEF_ADVPREFERREDLIFETIME 604800
-struct	in6_prefixreq	prereq = {{NULL}, /* interface name */
-				      PR_ORIG_STATIC,
-				      64, /* default plen */
-				      2592000, /* vltime=30days */
-				      604800, /* pltime=7days */
-				      /* ra onlink=1 autonomous=1 */
-				      {{1,1,0}},
-				      {NULL}};  /* prefix */
-struct	in6_rrenumreq	rrreq = {{NULL}, /* interface name */
-					 PR_ORIG_STATIC, /* default origin */
-					 64, /* default match len */
-					 0, /* default min match len */
-					 128, /* default max match len */
-					 0, /* default uselen */
-					 0, /* default keeplen */
-				         {1,1,0}, /* default raflag mask */
-					 2592000, /* vltime=30days */
-					 604800, /* pltime=7days */
-					 /* ra onlink=1 autonomous=1 */
-					 {{1,1,0}},
-					 {NULL}, /* match prefix */
-					 {NULL} /* use prefix */
-					 };
-
-#define C(x) ((caddr_t) &x)
-
-struct prefix_cmds {
-	const char *errmsg;
-	int cmd;
-	caddr_t req;
-} prcmds[] = {
-	{"SIOCSIFPREFIX_IN6 failed", SIOCSIFPREFIX_IN6, C(prereq)},
-	{"SIOCDIFPREFIX_IN6 failed", SIOCDIFPREFIX_IN6, C(prereq)},
-	{"SIOCAIFPREFIX_IN6 failed", SIOCAIFPREFIX_IN6, C(rrreq)},
-	{"SIOCCIFPREFIX_IN6 failed", SIOCCIFPREFIX_IN6, C(rrreq)},
-	{"SIOCSGIFPREFIX_IN6 failed", SIOCSGIFPREFIX_IN6, C(rrreq)}
-};
-
-#define PREF_CMD_SET		0
-#define PREF_CMD_DELETE		1
-#define PREF_CMD_ADD		2
-#define PREF_CMD_CHANGE		3
-#define PREF_CMD_SETGLOBAL	4
-#define PREF_CMD_MAX		5
-
-u_int	prcmd = PREF_CMD_SET;	/* default command */
-
-char	name[32];
-int	flags;
-
-int	newprefix_setdel, newprefix_match, newprefix_use, newprefix_uselen,
-	newprefix_keeplen;
-
-void	Perror __P((const char *cmd));
-int	prefix __P((int argc, char *const *argv));
-void	usage __P((void));
-void	setlifetime __P((const char *atime, u_int32_t *btime));
-int	all, explicit_prefix = 0;
-
-typedef	void c_func __P((const char *cmd, int arg));
-c_func	set_vltime, set_pltime, set_raf_onlink,
-	set_raf_auto, set_rrf_decrvalid, set_rrf_decrprefd,
-	get_setdelprefix, get_matchprefix, get_useprefix, set_matchlen,
-	set_match_minlen, set_match_maxlen,
-	set_use_uselen, set_use_keeplen, set_prefix_cmd;
-
-void getprefixlen __P((const char *, int));
-void getprefix __P((const char *, int));
-
-#define	NEXTARG		0xffffff
-
-const
-struct	cmd {
-	const	char *c_name;
-	int	c_parameter;		/* NEXTARG means next argv */
-	void	(*c_func) __P((const char *, int));
-} cmds[] = {
-	{ "set",	PREF_CMD_SET, set_prefix_cmd },
-	{ "delete",	PREF_CMD_DELETE, set_prefix_cmd },
-	{ "prefixlen",	NEXTARG,	getprefixlen },
-	{ "add",	PREF_CMD_ADD, set_prefix_cmd },
-	{ "change",	PREF_CMD_CHANGE, set_prefix_cmd },
-	{ "setglobal",	PREF_CMD_SETGLOBAL, set_prefix_cmd },
-	{ "matchpr",	NEXTARG,	get_matchprefix },
-	{ "usepr",	NEXTARG,	get_useprefix },
-	{ "mp_len",	NEXTARG,	set_matchlen },
-	{ "mp_minlen",	NEXTARG,	set_match_minlen },
-	{ "mp_maxlen",	NEXTARG,	set_match_maxlen },
-	{ "up_uselen",	NEXTARG,	set_use_uselen },
-	{ "up_keeplen",	NEXTARG,	set_use_keeplen },
-	{ "vltime",	NEXTARG,	set_vltime },
-	{ "pltime",	NEXTARG,	set_pltime },
-	{ "raf_onlink",		1,	set_raf_onlink },
-	{ "-raf_onlink",	0,	set_raf_onlink },
-	{ "raf_auto",		1,	set_raf_auto },
-	{ "-raf_auto",		0,	set_raf_auto },
-	{ "rrf_decrvalid",	1,	set_rrf_decrvalid },
-	{ "-rrf_decrvalid",	0,	set_rrf_decrvalid },
-	{ "rrf_decrprefd",	1,	set_rrf_decrprefd },
-	{ "-rrf_decrprefd",	0,	set_rrf_decrprefd },
-	{ 0,			0,	get_setdelprefix },
-	{ 0,	0,	0 },
-};
-
-
-void
-usage()
-{
-	fprintf(stderr, "%s",
-	"usage: prefix interface prefix_value [parameters] [set|delete]\n"
-	"       prefix interface\n"
-	"                matchpr matchpr_value mp_len mp_len_value\n"
-	"                usepr usepr_value up_uselen up_uselen_value\n"
-	"                [parameters] [add|change|setglobal]\n"
-	"       prefix -a [-d] [-u]\n"
-	"                matchpr matchpr_value mp_len mp_len_value\n"
-	"                usepr usepr_value up_uselen up_uselen_value\n"
-	"                [parameters] [add|change|setglobal]\n");
-	exit(1);
-}
-
-int
-main(argc, argv)
-	int argc;
-	char *const *argv;
-{
-	int c;
-	int downonly, uponly;
-	int foundit = 0;
-	int addrcount;
-	struct	if_msghdr *ifm, *nextifm;
-	struct	ifa_msghdr *ifam;
-	struct	sockaddr_dl *sdl;
-	char	*buf, *lim, *next;
-
-
-	size_t needed;
-	int mib[6];
-
-	/* Parse leading line options */
-	all = downonly = uponly = 0;
-	while ((c = getopt(argc, argv, "adu")) != -1) {
-		switch (c) {
-		case 'a':	/* scan all interfaces */
-			all++;
-			break;
-		case 'd':	/* restrict scan to "down" interfaces */
-			downonly++;
-			break;
-		case 'u':	/* restrict scan to "up" interfaces */
-			uponly++;
-			break;
-		default:
-			usage();
-			break;
-		}
-	}
-	argc -= optind;
-	argv += optind;
-
-	/* nonsense.. */
-	if (uponly && downonly)
-		usage();
-
-	if (!all) {
-		/* not listing, need an argument */
-		if (argc < 1)
-			usage();
-
-		strncpy(name, *argv, sizeof(name));
-		argc--, argv++;
-	}
-
-	mib[0] = CTL_NET;
-	mib[1] = PF_ROUTE;
-	mib[2] = 0;
-	mib[3] = AF_INET6;	/* address family */
-	mib[4] = NET_RT_IFLIST;
-	mib[5] = 0;
-
-	if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
-		errx(1, "iflist-sysctl-estimate");
-	if ((buf = malloc(needed)) == NULL)
-		errx(1, "malloc");
-	if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
-		errx(1, "actual retrieval of interface table");
-	lim = buf + needed;
-
-	next = buf;
-	while (next < lim) {
-
-		ifm = (struct if_msghdr *)next;
-		
-		if (ifm->ifm_type == RTM_IFINFO) {
-			sdl = (struct sockaddr_dl *)(ifm + 1);
-			flags = ifm->ifm_flags;
-		} else {
-			fprintf(stderr, "out of sync parsing NET_RT_IFLIST\n");
-			fprintf(stderr, "expected %d, got %d\n", RTM_IFINFO,
-				ifm->ifm_type);
-			fprintf(stderr, "msglen = %d\n", ifm->ifm_msglen);
-			fprintf(stderr, "buf:%p, next:%p, lim:%p\n", buf, next,
-				lim);
-			exit (1);
-		}
-
-		next += ifm->ifm_msglen;
-		ifam = NULL;
-		addrcount = 0;
-		while (next < lim) {
-
-			nextifm = (struct if_msghdr *)next;
-
-			if (nextifm->ifm_type != RTM_NEWADDR)
-				break;
-
-			if (ifam == NULL)
-				ifam = (struct ifa_msghdr *)nextifm;
-
-			addrcount++;
-			next += nextifm->ifm_msglen;
-		}
-
-		if (all) {
-			if (uponly)
-				if ((flags & IFF_UP) == 0)
-					continue; /* not up */
-			if (downonly)
-				if (flags & IFF_UP)
-					continue; /* not down */
-			strncpy(name, sdl->sdl_data, sdl->sdl_nlen);
-			name[sdl->sdl_nlen] = '\0';
-		} else {
-			if (strlen(name) != sdl->sdl_nlen)
-				continue; /* not same len */
-			if (strncmp(name, sdl->sdl_data, sdl->sdl_nlen) != 0)
-				continue; /* not same name */
-		}
-
-		if (argc > 0)
-			prefix(argc, argv);
-#if 0
-		else {
-			/* TODO: print prefix status by sysctl */
-		}
-#endif
-
-		if (all == 0) {
-			foundit++; /* flag it as 'done' */
-			break;
-		}
-	}
-	free(buf);
-
-	if (all == 0 && foundit == 0)
-		errx(1, "interface %s does not exist", name);
-
-
-	exit (0);
-}
-
-
-int
-prefix(int argc, char *const *argv)
-{
-	int s;
-
-	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
-		err(1, "socket");
-
-	while (argc > 0) {
-		register const struct cmd *p;
-
-		for (p = cmds; p->c_name; p++)
-			if (strcmp(*argv, p->c_name) == 0)
-				break;
-		if (p->c_func) {
-			if (p->c_parameter == NEXTARG) {
-				if (argv[1] == NULL)
-					errx(1, "'%s' requires argument",
-					    p->c_name);
-				(*p->c_func)(argv[1], 0);
-				argc--, argv++;
-			} else
-				(*p->c_func)(*argv, p->c_parameter);
-		}
-		argc--, argv++;
-	}
-	if (prcmd > PREF_CMD_MAX) {
-		Perror("ioctl: unknown prefix cmd");
-		goto end;
-	}
-	if (prcmd == PREF_CMD_SET || prcmd == PREF_CMD_DELETE) {
-		if (!newprefix_setdel)
-			usage();
-	} else { /* ADD|CHANGE|SETGLOBAL */
-		if (!newprefix_match)
-			usage();
-	}
-	if (!newprefix_use)
-		rrreq.irr_u_uselen = 0; /* make clear that no use_prefix */
-	else if (newprefix_keeplen == NULL && rrreq.irr_u_uselen < 64)
-		/* init keeplen to make uselen + keeplen equal 64 */
-		rrreq.irr_u_keeplen = 64 - rrreq.irr_u_uselen;
-	if (explicit_prefix == 0) {
-		/* Aggregatable address architecture defines all prefixes
-		   are 64. So, it is convenient to set prefixlen to 64 if
-		   it is not specified. */
-		getprefixlen("64", 0);
-	}
-	strncpy(prcmds[prcmd].req, name, IFNAMSIZ);
-	if (ioctl(s, prcmds[prcmd].cmd, prcmds[prcmd].req) < 0) {
-		if (all && errno == EADDRNOTAVAIL)
-			goto end;
-		Perror(prcmds[prcmd].errmsg);
-	}
-    end:
-	close(s);
-	return(0);
-}
-#define PREFIX	0
-#define MPREFIX	1
-#define UPREFIX	2
-
-void
-Perror(cmd)
-	const char *cmd;
-{
-	switch (errno) {
-
-	case ENXIO:
-		errx(1, "%s: no such interface", cmd);
-		break;
-
-	case EPERM:
-		errx(1, "%s: permission denied", cmd);
-		break;
-
-	default:
-		err(1, "%s", cmd);
-	}
-}
-
-#define SIN6(x) ((struct sockaddr_in6 *) &(x))
-struct sockaddr_in6 *sin6tab[] = {
-SIN6(prereq.ipr_prefix), SIN6(rrreq.irr_matchprefix),
-SIN6(rrreq.irr_useprefix)};
-
-void
-getprefixlen(const char *plen, int unused)
-{
-	int len = atoi(plen);
-
-	if ((len < 0) || (len > 128))
-		errx(1, "%s: bad value", plen);
-
-	/* set plen for prereq */
-	prereq.ipr_plen = len;
-	explicit_prefix = 1;
-}
-
-void
-getprefix(const char *prefix, int which)
-{
-	register struct sockaddr_in6 *sin = sin6tab[which];
-
-	/*
-	 * Delay the ioctl to set the interface prefix until flags are all set.
-	 * The prefix interpretation may depend on the flags,
-	 * and the flags may change when the prefix is set.
-	 */
-
-	sin->sin6_len = sizeof(*sin);
-	sin->sin6_family = AF_INET6;
-
-        if (inet_pton(AF_INET6, prefix, &sin->sin6_addr) != 1)
-		errx(1, "%s: bad value", prefix);
-}
-
-void
-get_setdelprefix(const char *prefix, int unused)
-{
-	newprefix_setdel++;
-	getprefix(prefix, PREFIX);
-}
-
-void
-get_matchprefix(const char *prefix, int unused)
-{
-	newprefix_match++;
-	prcmd = (prcmd == PREF_CMD_SET) ? PREF_CMD_ADD : prcmd;
-	getprefix(prefix, MPREFIX);
-}
-
-void
-get_useprefix(const char *prefix, int unused)
-{
-	newprefix_use++;
-	if (newprefix_uselen == 0)
-		rrreq.irr_u_uselen = 64;
-	getprefix(prefix, UPREFIX);
-}
-
-static int
-get_plen(const char *plen)
-{
-	int len;
-
-	len = atoi(plen);
-	if ((len < 0) || (len > 128))
-		errx(1, "%s: bad value", plen);
-	return len;
-}
-
-void
-set_matchlen(const char *plen, int unused)
-{
-	rrreq.irr_m_len = get_plen(plen);
-}
-
-void
-set_match_minlen(const char *plen, int unused)
-{
-	rrreq.irr_m_minlen = get_plen(plen);
-}
-
-void
-set_match_maxlen(const char *plen, int unused)
-{
-	rrreq.irr_m_maxlen = get_plen(plen);
-}
-
-void
-set_use_uselen(const char *plen, int unused)
-{
-	newprefix_uselen++;
-	rrreq.irr_u_uselen = get_plen(plen);
-}
-
-void
-set_use_keeplen(const char *plen, int unused)
-{
-	newprefix_keeplen++;
-	rrreq.irr_u_keeplen = get_plen(plen);
-}
-
-void
-set_vltime(const char *ltime, int unused)
-{
-	setlifetime(ltime, &prereq.ipr_vltime);
-	rrreq.irr_vltime = prereq.ipr_vltime;
-}
-
-void
-set_pltime(const char *ltime, int unused)
-{
-	setlifetime(ltime, &prereq.ipr_pltime);
-	rrreq.irr_pltime = prereq.ipr_pltime;
-}
-
-void
-set_raf_onlink(const char *unused, int value)
-{
-	/* raflagmask is only meaningful when newprefix_rrenum */
-	rrreq.irr_raflagmask.onlink = 1;
-	prereq.ipr_flags.prf_ra.onlink =
-	rrreq.irr_flags.prf_ra.onlink = value ? 1 : 0;
-}
-
-void
-set_raf_auto(const char *unused, int value)
-{
-	/* only meaningful when newprefix_rrenum */
-	rrreq.irr_raflagmask.autonomous = 1;
-	prereq.ipr_flags.prf_ra.autonomous =
-	rrreq.irr_flags.prf_ra.autonomous = value ? 1 : 0;
-}
-
-void
-set_rrf_decrvalid(const char *unused, int value)
-{
-	prereq.ipr_flags.prf_rr.decrvalid =
-	rrreq.irr_flags.prf_rr.decrvalid = value ? 1 : 0;
-}
-
-void
-set_rrf_decrprefd(const char *unused, int value)
-{
-	prereq.ipr_flags.prf_rr.decrprefd =
-	rrreq.irr_flags.prf_rr.decrprefd = value ? 1 : 0;
-}
-
-void
-set_prefix_cmd(const char *unused, int cmd)
-{
-	prcmd = cmd;
-}
-
-void
-setlifetime(const char *atime, u_int32_t *btime)
-{
-	int days = 0, hours = 0, minutes = 0, seconds = 0;
-	u_int32_t ttime;
-	char *check;
-
-	if (strcmp(atime, "infinity") == 0) {
-		*btime = 0xffffffff;
-		return;
-	}
-	ttime = strtoul(atime, &check ,10) & 0xffffffff;
-	if (*check == '\0') {
-		*btime = ttime;
-		return;
-	}
-	if (sscanf(atime, "d%2dh%2dm%2ds%2d", &days, &hours, &minutes,
-		   &seconds) < 0) {
-		Perror("wrong time format: valid is d00h00m00s00, \n"
-		       "where 00 can be any octal number, \n"
-		       "\'d\' is for days, \'h\' is for hours, \n"
-		       "\'m\' is for minutes, and \'s\' is for seconds \n");
-		return;
-	}
-	*btime = 0;
-	*btime += seconds;
-	*btime += minutes * 60;
-	*btime += hours * 3600;
-	*btime += days * 86400;
-	return;
-}
diff --git a/usr.sbin/prefix/prefix.sh b/usr.sbin/prefix/prefix.sh
new file mode 100644
index 0000000..ee727b3
--- /dev/null
+++ b/usr.sbin/prefix/prefix.sh
@@ -0,0 +1,74 @@
+#!/bin/sh
+
+#	$KAME: prefix.sh,v 1.12 2001/05/26 23:38:10 itojun Exp $
+#	$FreeBSD$
+
+# Copyright (c) 2001 WIDE Project. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. Neither the name of the project nor the names of its contributors
+#    may be used to endorse or promote products derived from this software
+#    without specific prior written permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+
+iface=$1
+prefix=$2
+
+usage() {
+    echo "usage: prefix interface prefix [set|delete]"
+}
+
+# We're now invalidating the prefix ioctls and the corresponding command.
+echo "** The prefix command is almost invalidated. Please use ifconfig(8). **"
+
+if [ X"$iface" = X -o X"$prefix" = X ]; then
+    usage
+    exit 1
+fi
+
+if [ -z $3 ]; then
+    command=set
+else
+    command=$3
+fi
+
+case $command in
+    set)
+	laddr=`ifconfig $iface inet6 | grep 'inet6 fe80:' | head -1 | awk '{print $2}'` 
+	if [ X"$laddr" = X ]; then
+	    echo "prefix: no interface ID found"
+	    exit 1
+	fi
+	hostid=`echo $laddr | sed -e 's/^fe80:[0-9a-fA-F]*:/fe80::/' -e 's/^fe80:://' -e 's/%.*//'`
+	address=$2$hostid
+	exec ifconfig $iface inet6 $address prefixlen 64 alias
+    ;;
+    delete)
+    	addrs=`ifconfig $iface inet6 | grep "inet6 $prefix" |  awk '{print $2}'`
+	for a in $addrs; do
+	    ifconfig $iface inet6 $a -alias
+	done
+    ;;
+    *)
+	usage
+	exit 1
+    ;;
+esac