Getaddrinfo(), getnameinfo(), and etc support in libc/net.

Several udp and raw apps IPv6 support.

Reviewed by: freebsd-arch, cvs-committers
Obtained from: KAME project

1 files changed, 2913 insertions, 0 deletions

diff --git a/usr.sbin/route6d/route6d.c b/usr.sbin/route6d/route6d.c
new file mode 100644
index 0000000..857f5cb
--- /dev/null
+++ b/usr.sbin/route6d/route6d.c
@@ -0,0 +1,2913 @@
+/*
+ * $Header: /cvsroot/kame/kame/kame/kame/route6d/route6d.c,v 1.6 1999/09/10 08:20:59 itojun Exp $
+ */
+
+/*
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	lint
+static char _rcsid[] = "$Id: route6d.c,v 1.6 1999/09/10 08:20:59 itojun Exp $";
+#endif
+
+#include <stdio.h>
+
+#include <time.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#ifdef __STDC__
+#include <stdarg.h>
+#else
+#include <varargs.h>
+#endif
+#include <syslog.h>
+#include <stddef.h>
+#include <err.h>
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/sysctl.h>
+#include <sys/errno.h>
+#ifdef ADVAPI
+#include <sys/uio.h>
+#endif
+#include <net/if.h>
+#if defined(__FreeBSD__) && __FreeBSD__ >= 3
+#include <net/if_var.h>
+#endif /* __FreeBSD__ >= 3 */
+#define	KERNEL	1
+#include <net/route.h>
+#undef KERNEL
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include <netinet/ip6.h>
+#include <netinet/udp.h>
+#include <netdb.h>
+
+#include <arpa/inet.h>
+
+#include "route6d.h"
+
+#define	MAXFILTER	40
+
+#ifdef	DEBUG
+#define	INIT_INTERVAL6	6
+#else
+#define	INIT_INTERVAL6	10	/* Wait to submit a initial riprequest */
+#endif
+
+/* alignment constraint for routing socket */
+#define	ROUNDUP(a) \
+	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
+#define	ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
+
+/*
+ * Following two macros are highly depending on KAME Release
+ */
+#define	IN6_LINKLOCAL_IFINDEX(addr) \
+	((addr).s6_addr[2] << 8 | (addr).s6_addr[3])
+
+#define	SET_IN6_LINKLOCAL_IFINDEX(addr, index) \
+	do { \
+		(addr).s6_addr[2] = ((index) >> 8) & 0xff; \
+		(addr).s6_addr[3] = (index) & 0xff; \
+	} while (0)
+
+struct	ifc {			/* Configuration of an interface */
+	char	*ifc_name;			/* if name */
+	struct	ifc *ifc_next;
+	int	ifc_index;			/* if index */
+	int	ifc_mtu;			/* if mtu */
+	int	ifc_metric;			/* if metric */
+	short	ifc_flags;			/* flags */
+	struct	in6_addr ifc_mylladdr;		/* my link-local address */
+	struct	sockaddr_in6 ifc_ripsin;	/* rip multicast address */
+	struct	iff *ifc_filter;		/* filter structure */
+	struct	ifac *ifc_addr;			/* list of AF_INET6 addresses */
+	int	ifc_joined;			/* joined to ff02::9 */
+};
+
+struct	ifac {			/* Adddress associated to an interface */
+	struct	ifc *ifa_conf;		/* back pointer */
+	struct	ifac *ifa_next;
+	struct	in6_addr ifa_addr;	/* address */
+	struct	in6_addr ifa_raddr;	/* remote address, valid in p2p */
+	int	ifa_plen;		/* prefix length */
+};
+
+struct	iff {
+	int	iff_type;
+	struct	in6_addr iff_addr;
+	int	iff_plen;
+	struct	iff *iff_next;
+};
+
+struct	ifc *ifc;
+int	nifc;		/* number of valid ifc's */
+struct	ifc **index2ifc;
+int	nindex2ifc;
+struct	ifc *loopifcp = NULL;	/* pointing to loopback */
+int	loopifindex = 0;	/* ditto */
+fd_set	sockvec;	/* vector to select() for receiving */
+int	rtsock;		/* the routing socket */
+int	ripsock;	/* socket to send/receive RIP datagram */
+
+struct	rip6 *ripbuf;	/* packet buffer for sending */
+
+/*
+ * Maintain the routes in a linked list. When the number of the routes
+ * grows, somebody would like to introduce a hash based or a radix tree
+ * based strucutre. I believe the number of routes handled by RIP is
+ * limited and I don't have to manage a complex data structure, however.
+ *
+ * One of the major drawbacks of the linear linked list is the difficulty
+ * of representing the relationship between a couple of routes. This may
+ * be a significant problem when we have to support route aggregation with
+ * supressing the specifices covered by the aggregate.
+ */
+
+struct	riprt {
+	struct	riprt *rrt_next;	/* next destination */
+	struct	riprt *rrt_same;	/* same destination - future use */
+	struct	netinfo6 rrt_info;	/* network info */
+	struct	in6_addr rrt_gw;	/* gateway */
+	u_long	rrt_flags;
+	time_t	rrt_t;			/* when the route validated */
+	int	rrt_index;		/* ifindex from which this route got */
+};
+
+struct	riprt *riprt = 0;
+
+int	dflag = 0;	/* debug flag */
+int	qflag = 0;	/* quiet flag */
+int	nflag = 0;	/* don't update kernel routing table */
+int	aflag = 0;	/* age out even the statically defined routes */
+int	hflag = 0;	/* don't split horizon */
+int	lflag = 0;	/* exchange site local routes */
+int	sflag = 0;	/* announce static routes w/ split horizon */
+int	Sflag = 0;	/* announce static routes to every interface */
+int	routetag = 0;	/* route tag attached on originating case */
+
+char	*filter[MAXFILTER];
+int	filtertype[MAXFILTER];
+int	nfilter = 0;
+
+pid_t	pid;
+
+struct	sockaddr_storage ripsin;
+
+struct	rtentry rtentry;
+
+int	interval = 1;
+time_t	nextalarm = 0;
+time_t	sup_trig_update = 0;
+
+FILE	*rtlog = NULL;
+
+int logopened = 0;
+
+static	u_long	seq = 0;
+
+#define	RTF_AGGREGATE		0x08000000
+#define	RTF_NOADVERTISE		0x10000000
+#define	RTF_NH_NOT_LLADDR	0x20000000
+#define	RTF_SENDANYWAY		0x40000000
+#define	RTF_CHANGED		0x80000000
+#define	RTF_ROUTE_H		0xffff
+
+extern int errno;
+
+int main __P((int, char **));
+void ripalarm __P((int));
+void riprecv __P((void));
+void ripsend __P((struct ifc *, struct sockaddr_in6 *, int));
+void init __P((void));
+void sockopt __P((struct ifc *));
+void ifconfig __P((void));
+void ifconfig1 __P((struct ifreq *, struct ifc *, int));
+void rtrecv __P((void));
+int rt_del __P((const struct sockaddr_in6 *, const struct sockaddr_in6 *,
+	const struct sockaddr_in6 *));
+int rt_deladdr __P((struct ifc *, const struct sockaddr_in6 *,
+	const struct sockaddr_in6 *));
+void filterconfig __P((void));
+int getifmtu __P((int));
+const char *rttypes __P((struct rt_msghdr *rtm));
+const char *rtflags __P((struct rt_msghdr *rtm));
+const char *ifflags __P((int flags));
+void ifrt __P((struct ifc *, int));
+void applymask __P((struct in6_addr *, struct in6_addr *));
+void applyplen __P((struct in6_addr *, int));
+void ifrtdump __P((int));
+void ifdump __P((int));
+void ifdump0 __P((FILE *, const struct ifc *));
+void rtdump __P((int));
+void rt_entry __P((struct rt_msghdr *, int));
+void rtdexit __P((int));
+void riprequest __P((struct ifc *, struct netinfo6 *, int, struct sockaddr_in6 *));
+void ripflush __P((struct ifc *, struct sockaddr_in6 *));
+void sendrequest __P((struct ifc *));
+int mask2len __P((const struct in6_addr *, int));
+int sendpacket __P((struct sockaddr_in6 *, int));
+int addroute __P((struct riprt *, const struct in6_addr *, struct ifc *));
+int delroute __P((struct netinfo6 *, struct in6_addr *));
+struct in6_addr *getroute __P((struct netinfo6 *, struct in6_addr *));
+void krtread __P((int));
+int tobeadv __P((struct riprt *, struct ifc *));
+char *allocopy __P((char *));
+char *hms __P((void));
+const char *inet6_n2p __P((const struct in6_addr *));
+struct ifac *ifa_match __P((const struct ifc *, const struct in6_addr *, int));
+struct in6_addr *plen2mask __P((int));
+struct riprt *rtsearch __P((struct netinfo6 *));
+int ripinterval __P((int));
+time_t ripsuptrig __P((void));
+void fatal __P((const char *, ...));
+void trace __P((int, const char *, ...));
+void tracet __P((int, const char *, ...));
+unsigned int if_maxindex __P((void));
+struct ifc *ifc_find __P((char *));
+struct iff *iff_find __P((struct ifc *, int));
+void setindex2ifc __P((int, struct ifc *));
+
+#define	MALLOC(type)	((type *)malloc(sizeof(type)))
+
+int
+main(argc, argv)
+	int	argc;
+	char	**argv;
+{
+	int	ch;
+	int	error = 0;
+	struct	ifc *ifcp;
+	sigset_t mask, omask;
+	FILE	*pidfile;
+	extern char *optarg;
+	extern int optind;
+	char *progname;
+
+	progname = strrchr(*argv, '/');
+	if (progname)
+		progname++;
+	else
+		progname = *argv;
+
+	pid = getpid();
+	while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != EOF) {
+		switch (ch) {
+		case 'A':
+		case 'N':
+		case 'O':
+		case 'T':
+		case 'L':
+			if (nfilter >= MAXFILTER)
+				fatal("Exceeds MAXFILTER");
+			filtertype[nfilter] = ch;
+			filter[nfilter++] = allocopy(optarg);
+			break;
+		case 't':
+			sscanf(optarg, "%i", &routetag);
+			if (routetag & ~0xffff) {
+				fatal("invalid route tag");
+				/*NOTREACHED*/
+			}
+			break;
+		case 'R':
+			if ((rtlog = fopen(optarg, "w")) == NULL)
+				fatal("Can not write to routelog");
+			break;
+#define	FLAG(c, flag, n)	case c: flag = n; break
+		FLAG('a', aflag, 1);
+		FLAG('d', dflag, 1);
+		FLAG('D', dflag, 2);
+		FLAG('h', hflag, 1);
+		FLAG('l', lflag, 1);
+		FLAG('n', nflag, 1);
+		FLAG('q', qflag, 1);
+		FLAG('s', sflag, 1);
+		FLAG('S', Sflag, 1);
+#undef	FLAG
+		default:
+			fatal("Invalid option specified, terminating");
+		}
+	}
+	argc -= optind;
+	argv += optind;
+	if (argc > 0)
+		fatal("bogus extra arguments");
+
+	if (geteuid()) {
+		nflag = 1;
+		fprintf(stderr, "No kernel update is allowed\n");
+	}
+	openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
+	logopened++;
+	init();
+	ifconfig();
+	for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
+		if (ifcp->ifc_index < 0) {
+			fprintf(stderr,
+"No ifindex found at %s (no link-local address?)\n",
+				ifcp->ifc_name);
+			error++;
+		}
+	}
+	if (error)
+		exit(1);
+	if (loopifcp == NULL)
+		fatal("No loopback found");
+	loopifindex = loopifcp->ifc_index;
+	for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
+		ifrt(ifcp, 0);
+	filterconfig();
+	krtread(0);
+	if (dflag)
+		ifrtdump(0);
+
+	if (dflag == 0) {
+#if 1
+		if (daemon(0, 0) < 0)
+			fatal("daemon");
+#else
+		if (fork())
+			exit(0);
+		if (setsid() < 0)
+			fatal("setid");
+#endif
+	}
+	pid = getpid();
+	if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) {
+		fprintf(pidfile, "%d\n", pid);
+		fclose(pidfile);
+	}
+
+	if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL)
+		fatal("malloc");
+	ripbuf->rip6_cmd = RIP6_RESPONSE;
+	ripbuf->rip6_vers = RIP6_VERSION;
+	ripbuf->rip6_res1[0] = 0;
+	ripbuf->rip6_res1[1] = 0;
+
+	if (signal(SIGALRM, ripalarm) == SIG_ERR)
+		fatal("signal: SIGALRM");
+	if (signal(SIGQUIT, rtdexit) == SIG_ERR)
+		fatal("signal: SIGQUIT");
+	if (signal(SIGTERM, rtdexit) == SIG_ERR)
+		fatal("signal: SIGTERM");
+	if (signal(SIGUSR1, ifrtdump) == SIG_ERR)
+		fatal("signal: SIGUSR1");
+	if (signal(SIGHUP, ifrtdump) == SIG_ERR)
+		fatal("signal: SIGHUP");
+	if (signal(SIGINT, ifrtdump) == SIG_ERR)
+		fatal("signal: SIGINT");
+	/*
+	 * To avoid rip packet congestion (not on a cable but in this
+	 * process), wait for a moment to send the first RIP6_RESPONSE
+	 * packets.
+	 */
+	alarm(ripinterval(INIT_INTERVAL6));
+
+	for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
+		if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
+			sendrequest(ifcp);
+	}
+
+	syslog(LOG_INFO, "**** Started ****");
+	sigemptyset(&mask);
+	sigaddset(&mask, SIGALRM);
+	while (1) {
+		fd_set	recvec;
+
+		FD_COPY(&sockvec, &recvec);
+		switch (select(FD_SETSIZE, &recvec, 0, 0, 0)) {
+		case -1:
+			if (errno == EINTR)
+				continue;
+			fatal("select");
+		case 0:
+			continue;
+		default:
+			if (FD_ISSET(ripsock, &recvec)) {
+				sigprocmask(SIG_BLOCK, &mask, &omask);
+				riprecv();
+				sigprocmask(SIG_SETMASK, &omask, NULL);
+			}
+			if (FD_ISSET(rtsock, &recvec)) {
+				sigprocmask(SIG_BLOCK, &mask, &omask);
+				rtrecv();
+				sigprocmask(SIG_SETMASK, &omask, NULL);
+			}
+		}
+	}
+}
+
+/*
+ * gracefully exits after resetting sockopts.
+ */
+/* ARGSUSED */
+void
+rtdexit(sig)
+	int sig;
+{
+	struct	riprt *rrt;
+
+	alarm(0);
+	for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
+		if (rrt->rrt_flags & RTF_AGGREGATE) {
+			delroute(&rrt->rrt_info, &rrt->rrt_gw);
+		}
+	}
+	close(ripsock);
+	close(rtsock);
+	syslog(LOG_INFO, "**** Terminated ****");
+	closelog();
+	exit(1);
+}
+
+/*
+ * Called periodically:
+ *	1. age out the learned route. remove it if necessary.
+ *	2. submit RIP6_RESPONSE packets.
+ * Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have
+ * to invoke this function in every 1 or 5 or 10 seconds only to age the
+ * routes more precisely.
+ */
+/* ARGSUSED */
+void
+ripalarm(sig)
+	int sig;
+{
+	struct	ifc *ifcp;
+	struct	riprt *rrt, *rrt_prev, *rrt_next;
+	time_t	t_lifetime, t_holddown;
+
+	/* age the RIP routes */
+	rrt_prev = 0;
+	t_lifetime = time(NULL) - RIP_LIFETIME;
+	t_holddown = t_lifetime - RIP_HOLDDOWN;
+	for (rrt = riprt; rrt; rrt = rrt_next) {
+		rrt_next = rrt->rrt_next;
+
+		if (rrt->rrt_t == 0) {
+			rrt_prev = rrt;
+			continue;
+		}
+		if (rrt->rrt_t < t_holddown) {
+			if (rrt_prev) {
+				rrt_prev->rrt_next = rrt->rrt_next;
+			} else {
+				riprt = rrt->rrt_next;
+			}
+			delroute(&rrt->rrt_info, &rrt->rrt_gw);
+			free(rrt);
+			continue;
+		}
+		if (rrt->rrt_t < t_lifetime)
+			rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
+		rrt_prev = rrt;
+	}
+	/* Supply updates */
+	for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
+		if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
+			ripsend(ifcp, &ifcp->ifc_ripsin, 0);
+	}
+	alarm(ripinterval(SUPPLY_INTERVAL6));
+}
+
+void
+init()
+{
+#ifdef ADVAPI
+	int	i;
+#endif
+	int	int0, int255, error;
+	struct	addrinfo hints, *res;
+	char	port[10];
+
+	ifc = (struct ifc *)NULL;
+	nifc = 0;
+	nindex2ifc = 0;	/*initial guess*/
+	index2ifc = NULL;
+	snprintf(port, sizeof(port), "%d", RIP6_PORT);
+
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = PF_INET6;
+	hints.ai_socktype = SOCK_DGRAM;
+	hints.ai_flags = AI_PASSIVE;
+	error = getaddrinfo(NULL, port, &hints, &res);
+	if (error)
+		fatal(gai_strerror(error));
+	if (res->ai_next)
+		fatal(":: resolved to multiple address");
+
+	int0 = 0; int255 = 255;
+	ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+	if (ripsock < 0)
+		fatal("rip socket");
+	if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0)
+		fatal("rip bind");
+	if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
+		&int255, sizeof(int255)) < 0)
+		fatal("rip IPV6_MULTICAST_HOPS");
+	if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
+		&int0, sizeof(int0)) < 0)
+		fatal("rip IPV6_MULTICAST_LOOP");
+#ifdef ADVAPI
+	i = 1;
+	if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, &i, sizeof(i)) < 0)
+		fatal("rip IPV6_PKTINFO");
+#endif /*ADVAPI*/
+
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = PF_INET6;
+	hints.ai_socktype = SOCK_DGRAM;
+	error = getaddrinfo(RIP6_DEST, port, &hints, &res);
+	if (error)
+		fatal(gai_strerror(error));
+	if (res->ai_next)
+		fatal("%s resolved to multiple address", RIP6_DEST);
+	memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
+
+#ifdef FD_ZERO
+	FD_ZERO(&sockvec);
+#else
+	memset(&sockvec, 0, sizeof(sockvec));
+#endif
+	FD_SET(ripsock, &sockvec);
+
+	if (nflag == 0) {
+		if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0)
+			fatal("route socket");
+		FD_SET(rtsock, &sockvec);
+	} else
+		rtsock = -1;	/*just for safety */
+}
+
+#define	RIPSIZE(n)	(sizeof(struct rip6) + (n-1) * sizeof(struct netinfo6))
+
+/*
+ * ripflush flushes the rip datagram stored in the rip buffer
+ */
+static int nrt;
+static struct netinfo6 *np;
+
+void
+ripflush(ifcp, sin)
+	struct ifc *ifcp;
+	struct sockaddr_in6 *sin;
+{
+	int i;
+	int error;
+
+	if (ifcp)
+		tracet(1, "Send(%s): info(%d) to %s.%d\n",
+			ifcp->ifc_name, nrt,
+			inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port));
+	else
+		tracet(1, "Send: info(%d) to %s.%d\n",
+			nrt, inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port));
+	if (dflag >= 2) {
+		np = ripbuf->rip6_nets;
+		for (i = 0; i < nrt; i++, np++) {
+			if (np->rip6_metric == NEXTHOP_METRIC) {
+				if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest))
+						trace(2, "    NextHop reset");
+				else {
+					trace(2, "    NextHop %s",
+						inet6_n2p(&np->rip6_dest));
+				}
+			} else {
+				trace(2, "    %s/%d[%d]",
+					inet6_n2p(&np->rip6_dest),
+					np->rip6_plen, np->rip6_metric);
+			}
+			if (np->rip6_tag) {
+				trace(2, "  tag=0x%04x",
+					ntohs(np->rip6_tag) & 0xffff);
+			}
+			trace(2, "\n");
+		}
+	}
+	error = sendpacket(sin, RIPSIZE(nrt));
+	if (error == EAFNOSUPPORT) {
+		/* Protocol not supported */
+		tracet(1, "Could not send info to %s (%s): "
+			"set IFF_UP to 0\n",
+			ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
+		ifcp->ifc_flags &= ~IFF_UP;	/* As if down for AF_INET6 */
+	}
+	nrt = 0; np = ripbuf->rip6_nets;
+}
+
+/*
+ * Generate RIP6_RESPONSE packets and send them.
+ */
+void
+ripsend(ifcp, sin, flag)
+	struct	ifc *ifcp;
+	struct	sockaddr_in6 *sin;
+	int flag;
+{
+	struct	riprt *rrt;
+	struct	in6_addr *nh;	/* next hop */
+	struct	in6_addr ia;
+	struct	iff *iffp;
+	int	maxrte, ok;
+
+	if (ifcp == NULL) {
+		/*
+		 * Request from non-link local address is not
+		 * a regular route6d update.
+		 */
+		maxrte = (IFMINMTU - sizeof(struct ip6_hdr) -
+				sizeof(struct udphdr) -
+				sizeof(struct rip6) + sizeof(struct netinfo6)) /
+				sizeof(struct netinfo6);
+		nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
+		for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
+			if (rrt->rrt_flags & RTF_NOADVERTISE)
+				continue;
+			/* Put the route to the buffer */
+			*np = rrt->rrt_info;
+			np++; nrt++;
+			if (nrt == maxrte) {
+				ripflush(NULL, sin);
+				nh = NULL;
+			}
+		}
+		if (nrt)	/* Send last packet */
+			ripflush(NULL, sin);
+		return;
+	}
+
+	if ((flag & RTF_SENDANYWAY) == 0 &&
+	    (qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
+		return;
+	if (iff_find(ifcp, 'N') != NULL)
+		return;
+	if (iff_find(ifcp, 'T') != NULL) {
+		struct netinfo6 rrt_info;
+		memset(&rrt_info, 0, sizeof(struct netinfo6));
+		rrt_info.rip6_dest = in6addr_any;
+		rrt_info.rip6_plen = 0;
+		rrt_info.rip6_metric = 1;
+		rrt_info.rip6_tag = htons(routetag & 0xffff);
+		np = ripbuf->rip6_nets;
+		*np = rrt_info;
+		nrt = 1;
+		ripflush(ifcp, sin);
+		return;
+	}
+	maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
+			sizeof(struct udphdr) -
+			sizeof(struct rip6) + sizeof(struct netinfo6)) /
+			sizeof(struct netinfo6);
+	nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
+	for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
+		if (rrt->rrt_flags & RTF_NOADVERTISE)
+			continue;
+		/* Need to check filer here */
+		ok = 1;
+		for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
+			if (iffp->iff_type != 'A')
+				continue;
+			if (rrt->rrt_info.rip6_plen <= iffp->iff_plen)
+				continue;
+			ia = rrt->rrt_info.rip6_dest;
+			applyplen(&ia, iffp->iff_plen);
+			if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
+				ok = 0;
+				break;
+			}
+		}
+		if (!ok)
+			continue;
+		for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
+			if (iffp->iff_type != 'O')
+				continue;
+			ok = 0;
+			if (rrt->rrt_info.rip6_plen < iffp->iff_plen)
+				continue;
+			ia = rrt->rrt_info.rip6_dest;
+			applyplen(&ia, iffp->iff_plen);
+			if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
+				ok = 1;
+				break;
+			}
+		}
+		if (!ok)
+			continue;
+		/* Check split horizon and other conditions */
+		if (tobeadv(rrt, ifcp) == 0)
+			continue;
+		/* Only considers the routes with flag if specified */
+		if ((flag & RTF_CHANGED) && (rrt->rrt_flags & RTF_CHANGED) == 0)
+			continue;
+		/* Check nexthop */
+		if (rrt->rrt_index == ifcp->ifc_index &&
+		    !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) &&
+		    (rrt->rrt_flags & RTF_NH_NOT_LLADDR) == 0) {
+			if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) {
+				if (nrt == maxrte - 2)
+					ripflush(ifcp, sin);
+				np->rip6_dest = rrt->rrt_gw;
+				if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest))
+					SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0);
+				np->rip6_plen = 0;
+				np->rip6_tag = 0;
+				np->rip6_metric = NEXTHOP_METRIC;
+				nh = &rrt->rrt_gw;
+				np++; nrt++;
+			}
+		} else if (nh && (rrt->rrt_index != ifcp->ifc_index ||
+			          !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) ||
+				  rrt->rrt_flags & RTF_NH_NOT_LLADDR)) {
+			/* Reset nexthop */
+			if (nrt == maxrte - 2)
+				ripflush(ifcp, sin);
+			memset(np, 0, sizeof(struct netinfo6));
+			np->rip6_metric = NEXTHOP_METRIC;
+			nh = NULL;
+			np++; nrt++;
+		}
+		/* Put the route to the buffer */
+		*np = rrt->rrt_info;
+		np++; nrt++;
+		if (nrt == maxrte) {
+			ripflush(ifcp, sin);
+			nh = NULL;
+		}
+	}
+	if (nrt)	/* Send last packet */
+		ripflush(ifcp, sin);
+}
+
+/*
+ * Determine if the route is to be advertised on the specified interface.
+ * It checks options specified in the arguments and the split horizon rule.
+ */
+int
+tobeadv(rrt, ifcp)
+	struct riprt *rrt;
+	struct ifc *ifcp;
+{
+
+	/* Special care for static routes */
+	if (rrt->rrt_flags & RTF_STATIC) {
+		if (Sflag)	/* Yes, advertise it anyway */
+			return 1;
+		if (sflag && rrt->rrt_index != ifcp->ifc_index)
+			return 1;
+		return 0;
+	}
+	/* Regular split horizon */
+	if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index)
+		return 0;
+	return 1;
+}
+
+/*
+ * Send a rip packet actually.
+ */
+int
+sendpacket(sin, len)
+	struct	sockaddr_in6 *sin;
+	int	len;
+{
+	/*
+	 * MSG_DONTROUTE should not be specified when it responds with a
+	 * RIP6_REQUEST message. SO_DONTROUTE has been specified to
+	 * other sockets.
+	 */
+#ifdef ADVAPI
+	struct msghdr m;
+	struct cmsghdr *cm;
+	struct iovec iov[2];
+	u_char cmsgbuf[256];
+	struct in6_pktinfo *pi;
+	int index;
+	struct sockaddr_in6 sincopy;
+
+	/* do not overwrite the given sin */
+	sincopy = *sin;
+	sin = &sincopy;
+
+	if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr)
+	 || IN6_IS_ADDR_MULTICAST(&sin->sin6_addr)) {
+		index = IN6_LINKLOCAL_IFINDEX(sin->sin6_addr);
+		SET_IN6_LINKLOCAL_IFINDEX(sin->sin6_addr, 0);
+	} else
+		index = 0;
+
+	m.msg_name = (caddr_t)sin;
+	m.msg_namelen = sizeof(*sin);
+	iov[0].iov_base = (caddr_t)ripbuf;
+	iov[0].iov_len = len;
+	m.msg_iov = iov;
+	m.msg_iovlen = 1;
+	if (!index) {
+		m.msg_control = NULL;
+		m.msg_controllen = 0;
+	} else {
+		memset(cmsgbuf, 0, sizeof(cmsgbuf));
+		cm = (struct cmsghdr *)cmsgbuf;
+		m.msg_control = (caddr_t)cm;
+		m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
+
+		cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
+		cm->cmsg_level = IPPROTO_IPV6;
+		cm->cmsg_type = IPV6_PKTINFO;
+		pi = (struct in6_pktinfo *)CMSG_DATA(cm);
+		memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/
+		pi->ipi6_ifindex = index;
+	}
+
+	if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) {
+		trace(1, "sendmsg: %s\n", strerror(errno));
+		return errno;
+	}
+#else
+	if (sendto(ripsock, ripbuf, len, 0 /*MSG_DONTROUTE*/,
+		(struct sockaddr *)sin, sizeof(struct sockaddr_in6)) < 0) {
+		trace(1, "sendto: %s\n", strerror(errno));
+		return errno;
+	}
+#endif
+	return 0;
+}
+
+/*
+ * Receive and process RIP packets. Update the routes/kernel forwarding
+ * table if necessary.
+ */
+void
+riprecv()
+{
+	struct	ifc *ifcp, *ic;
+	struct	sockaddr_in6 fsock;
+	struct	in6_addr nh;	/* next hop */
+	struct	rip6 *rp;
+	struct	netinfo6 *np, *nq;
+	struct	riprt *rrt;
+	int	len, nn, need_trigger, index;
+#ifndef ADVAPI
+	int	flen;
+#endif
+	char	buf[4 * RIP6_MAXMTU];
+	time_t	t;
+#ifdef ADVAPI
+	struct msghdr m;
+	struct cmsghdr *cm;
+	struct iovec iov[2];
+	u_char cmsgbuf[256];
+	struct in6_pktinfo *pi;
+#endif /*ADVAPI*/
+	struct iff *iffp;
+	struct in6_addr ia;
+	int ok;
+
+	need_trigger = 0;
+#ifdef ADVAPI
+	m.msg_name = (caddr_t)&fsock;
+	m.msg_namelen = sizeof(fsock);
+	iov[0].iov_base = (caddr_t)buf;
+	iov[0].iov_len = sizeof(buf);
+	m.msg_iov = iov;
+	m.msg_iovlen = 1;
+	cm = (struct cmsghdr *)cmsgbuf;
+	m.msg_control = (caddr_t)cm;
+	m.msg_controllen = sizeof(cmsgbuf);
+	if ((len = recvmsg(ripsock, &m, 0)) < 0)
+		fatal("recvmsg");
+	index = 0;
+	for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
+	     cm;
+	     cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
+		if (cm->cmsg_level == IPPROTO_IPV6
+		 && cm->cmsg_type == IPV6_PKTINFO) {
+			pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
+			index = pi->ipi6_ifindex;
+			break;
+		}
+	}
+	if (index && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
+		SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, index);
+#else
+	flen = sizeof(struct sockaddr_in6);
+	if ((len = recvfrom(ripsock, buf, sizeof(buf), 0,
+		(struct sockaddr *)&fsock, &flen)) < 0)
+		fatal("recvfrom");
+	if (IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
+		index = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
+	else
+		index = 0;
+#endif /*ADVAPI*/
+
+	nh = fsock.sin6_addr;
+	nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
+		sizeof(struct netinfo6);
+	rp = (struct rip6 *)buf;
+	np = rp->rip6_nets;
+
+	if (rp->rip6_vers !=  RIP6_VERSION) {
+		trace(1, "Incorrect RIP version %d\n", rp->rip6_vers);
+		return;
+	}
+	if (rp->rip6_cmd == RIP6_REQUEST) {
+		if (index && index < nindex2ifc) {
+			ifcp = index2ifc[index];
+			riprequest(ifcp, np, nn, &fsock);
+		} else {
+			riprequest(NULL, np, nn, &fsock);
+		}
+		return;
+	}
+
+	if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) {
+		trace(1, "Packets from non-ll addr: %s\n",
+			inet6_n2p(&fsock.sin6_addr));
+		return;		/* Ignore packets from non-link-local addr */
+	}
+	index = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
+	ifcp = (index < nindex2ifc) ? index2ifc[index] : NULL;
+	if (!ifcp) {
+		trace(1, "Packets to unknown interface index %d\n", index);
+		return;		/* Ignore it */
+	}
+	if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr))
+		return;		/* The packet is from me; ignore */
+	if (rp->rip6_cmd != RIP6_RESPONSE) {
+		trace(1, "Invalid command %d\n", rp->rip6_cmd);
+		return;
+	}
+	if (iff_find(ifcp, 'N') != NULL)
+		return;
+	tracet(1, "Recv(%s): from %s.%d info(%d)\n",
+		ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn);
+
+	t = time(NULL);
+	for (; nn; nn--, np++) {
+		if (np->rip6_metric == NEXTHOP_METRIC) {
+			/* modify neighbor address */
+			if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
+				nh = np->rip6_dest;
+				SET_IN6_LINKLOCAL_IFINDEX(nh, index);
+				trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
+			} else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) {
+				nh = fsock.sin6_addr;
+				trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
+			} else {
+				nh = fsock.sin6_addr;
+				trace(1, "\tInvalid Nexthop: %s\n",
+					inet6_n2p(&np->rip6_dest));
+			}
+			continue;
+		}
+		if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) {
+			trace(1, "\tMulticast netinfo6: %s/%d [%d]\n",
+				inet6_n2p(&np->rip6_dest),
+				np->rip6_plen, np->rip6_metric);
+			continue;
+		}
+		if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) {
+			trace(1, "\tLoopback netinfo6: %s/%d [%d]\n",
+				inet6_n2p(&np->rip6_dest),
+				np->rip6_plen, np->rip6_metric);
+			continue;
+		}
+		if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
+			trace(1, "\tLink Local netinfo6: %s/%d [%d]\n",
+				inet6_n2p(&np->rip6_dest),
+				np->rip6_plen, np->rip6_metric);
+			continue;
+		}
+		/* may need to pass sitelocal prefix in some case, however*/
+		if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) {
+			trace(1, "\tSite Local netinfo6: %s/%d [%d]\n",
+				inet6_n2p(&np->rip6_dest),
+				np->rip6_plen, np->rip6_metric);
+			continue;
+		}
+		trace(2, "\tnetinfo6: %s/%d [%d]",
+			inet6_n2p(&np->rip6_dest),
+			np->rip6_plen, np->rip6_metric);
+		if (np->rip6_tag)
+			trace(2, "  tag=0x%04x", ntohs(np->rip6_tag) & 0xffff);
+
+		/* Listen-only filter */
+		ok = 1;		/* if there's no L filter, it is ok */
+		for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
+			if (iffp->iff_type != 'L')
+				continue;
+			ok = 0;
+			if (np->rip6_plen < iffp->iff_plen)
+				continue;
+			/* special rule: ::/0 means default, not "in /0" */
+			if (iffp->iff_plen == 0 && np->rip6_plen > 0)
+				continue;
+			ia = np->rip6_dest;
+			applyplen(&ia, iffp->iff_plen);
+			if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
+				ok = 1;
+				break;
+			}
+		}
+		if (!ok) {
+			trace(2, "  (filtered)\n");
+			continue;
+		}
+
+		trace(2, "\n");
+		np->rip6_metric++;
+		np->rip6_metric += ifcp->ifc_metric;
+		if (np->rip6_metric > HOPCNT_INFINITY6)
+			np->rip6_metric = HOPCNT_INFINITY6;
+
+		applyplen(&np->rip6_dest, np->rip6_plen);
+		if ((rrt = rtsearch(np)) != NULL) {
+			if (rrt->rrt_t == 0)
+				continue;	/* Intf route has priority */
+			nq = &rrt->rrt_info;
+			if (nq->rip6_metric > np->rip6_metric) {
+				if (rrt->rrt_index == ifcp->ifc_index &&
+				    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
+					/* Small metric from the same gateway */
+					nq->rip6_metric = np->rip6_metric;
+				} else {
+					/* Better route found */
+					rrt->rrt_index = ifcp->ifc_index;
+					/* Update routing table */
+					delroute(nq, &rrt->rrt_gw);
+					rrt->rrt_gw = nh;
+					*nq = *np;
+					addroute(rrt, &nh, ifcp);
+				}
+				rrt->rrt_flags |= RTF_CHANGED;
+				rrt->rrt_t = t;
+				need_trigger = 1;
+			} else if (nq->rip6_metric < np->rip6_metric &&
+				   rrt->rrt_index == ifcp->ifc_index &&
+				   IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
+				/* Got worse route from same gw */
+				nq->rip6_metric = np->rip6_metric;
+				rrt->rrt_t = t;
+				rrt->rrt_flags |= RTF_CHANGED;
+				need_trigger = 1;
+			} else if (nq->rip6_metric == np->rip6_metric &&
+				   rrt->rrt_index == ifcp->ifc_index &&
+				   IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw) &&
+				   np->rip6_metric < HOPCNT_INFINITY6) {
+				/* same metric, same route from same gw */
+				rrt->rrt_t = t;
+			}
+			/*
+			 * if nq->rip6_metric == HOPCNT_INFINITY6 then
+			 * do not update age value. Do nothing.
+			 */
+		} else if (np->rip6_metric < HOPCNT_INFINITY6) {
+			/* Got a new valid route */
+			if ((rrt = MALLOC(struct riprt)) == NULL)
+				fatal("malloc: struct riprt");
+			nq = &rrt->rrt_info;
+
+			rrt->rrt_same = NULL;
+			rrt->rrt_index = ifcp->ifc_index;
+			rrt->rrt_flags = RTF_UP|RTF_GATEWAY;
+			rrt->rrt_gw = nh;
+			*nq = *np;
+			applyplen(&nq->rip6_dest, nq->rip6_plen);
+			if (nq->rip6_plen == sizeof(struct in6_addr) * 8)
+				rrt->rrt_flags |= RTF_HOST;
+
+			/* Put the route to the list */
+			rrt->rrt_next = riprt;
+			riprt = rrt;
+			/* Update routing table */
+			addroute(rrt, &nh, ifcp);
+			rrt->rrt_flags |= RTF_CHANGED;
+			need_trigger = 1;
+			rrt->rrt_t = t;
+		}
+	}
+	/* XXX need to care the interval between triggered updates */
+	if (need_trigger) {
+		if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
+			for (ic = ifc; ic; ic = ic->ifc_next) {
+				if (ifcp->ifc_index == ic->ifc_index)
+					continue;
+				if (ic->ifc_flags & IFF_UP)
+					ripsend(ic, &ic->ifc_ripsin,
+						RTF_CHANGED);
+			}
+		}
+		/* Reset the flag */
+		for (rrt = riprt; rrt; rrt = rrt->rrt_next)
+			rrt->rrt_flags &= ~RTF_CHANGED;
+	}
+}
+
+/*
+ * Send all routes request packet to the specified interface.
+ */
+void
+sendrequest(ifcp)
+	struct ifc *ifcp;
+{
+	struct netinfo6 *np;
+	int error;
+
+	if (ifcp->ifc_flags & IFF_LOOPBACK)
+		return;
+	ripbuf->rip6_cmd = RIP6_REQUEST;
+	np = ripbuf->rip6_nets;
+	memset(np, 0, sizeof(struct netinfo6));
+	np->rip6_metric = HOPCNT_INFINITY6;
+	tracet(1, "Send rtdump Request to %s (%s)\n",
+		ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
+	error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
+	if (error == EAFNOSUPPORT) {
+		/* Protocol not supported */
+		tracet(1, "Could not send rtdump Request to %s (%s): "
+			"set IFF_UP to 0\n",
+			ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
+		ifcp->ifc_flags &= ~IFF_UP;	/* As if down for AF_INET6 */
+	}
+	ripbuf->rip6_cmd = RIP6_RESPONSE;
+}
+
+/*
+ * Process a RIP6_REQUEST packet.
+ */
+void
+riprequest(ifcp, np, nn, sin)
+	struct ifc *ifcp;
+	struct netinfo6 *np;
+	int nn;
+	struct sockaddr_in6 *sin;
+{
+	int i;
+	struct riprt *rrt;
+
+	if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) &&
+	      np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) {
+		/* Specific response, don't split-horizon */
+		trace(1, "\tRIP Request\n");
+		for (i = 0; i < nn; i++, np++) {
+			rrt = rtsearch(np);
+			if (rrt)
+				np->rip6_metric = rrt->rrt_info.rip6_metric;
+			else
+				np->rip6_metric = HOPCNT_INFINITY6;
+		}
+		(void)sendpacket(sin, RIPSIZE(nn));
+		return;
+	}
+	/* Whole routing table dump */
+	trace(1, "\tRIP Request -- whole routing table\n");
+	ripsend(ifcp, sin, RTF_SENDANYWAY);
+}
+
+/*
+ * Get information of each interface.
+ */
+void
+ifconfig()
+{
+	int	s, i;
+	char	*buf;
+	struct	ifconf ifconf;
+	struct	ifreq *ifrp, ifr;
+	struct	ifc *ifcp;
+	struct	ipv6_mreq mreq;
+	int	bufsiz;
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
+		fatal("socket");
+
+	/* wild guess - v4, media, link, v6 * 3 */
+	bufsiz = if_maxindex() * sizeof(struct ifreq) * 6;
+	if ((buf = (char *)malloc(bufsiz)) == NULL)
+		fatal("malloc");
+
+	/*
+	 * ioctl(SIOCGIFCONF) does not return error on buffer size.
+	 * we'll try to guess the buffer size by trying it twice, with
+	 * different buffer size.
+	 */
+	ifconf.ifc_buf = buf;
+	ifconf.ifc_len = bufsiz / 2;
+	if (ioctl(s, SIOCGIFCONF, (char *)&ifconf) < 0)
+		fatal("ioctl: SIOCGIFCONF");
+	i = ifconf.ifc_len;
+	while (1) {
+		ifconf.ifc_buf = buf;
+		ifconf.ifc_len = bufsiz;
+		if (ioctl(s, SIOCGIFCONF, (char *)&ifconf) < 0)
+			fatal("ioctl: SIOCGIFCONF");
+		if (i == ifconf.ifc_len)
+			break;
+		i = ifconf.ifc_len;
+		bufsiz *= 2;
+		if ((buf = (char *)realloc(buf, bufsiz)) == NULL)
+			fatal("realloc");
+	}
+	for (i = 0; i < ifconf.ifc_len; ) {
+		ifrp = (struct ifreq *)(buf + i);
+		if (ifrp->ifr_addr.sa_family != AF_INET6)
+			goto skip;
+		ifcp = ifc_find(ifrp->ifr_name);
+		strcpy(ifr.ifr_name, ifrp->ifr_name);
+		if (ioctl(s, SIOCGIFFLAGS, (char *)&ifr) < 0)
+			fatal("ioctl: SIOCGIFFLAGS");
+		/* we are interested in multicast-capable interfaces */
+		if ((ifr.ifr_flags & IFF_MULTICAST) == 0)
+			goto skip;
+		if (!ifcp) {
+			/* new interface */
+			ifcp = (struct ifc *)malloc(sizeof(*ifcp));
+			memset(ifcp, 0, sizeof(*ifcp));
+			ifcp->ifc_index = -1;
+			ifcp->ifc_next = ifc;
+			ifc = ifcp;
+			nifc++;
+			ifcp->ifc_name = allocopy(ifrp->ifr_name);
+			ifcp->ifc_addr = 0;
+			ifcp->ifc_filter = 0;
+			ifcp->ifc_flags = ifr.ifr_flags;
+			trace(1, "newif %s <%s>\n", ifcp->ifc_name,
+				ifflags(ifcp->ifc_flags));
+			if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))
+				loopifcp = ifcp;
+		} else {
+			/* update flag, this may be up again */
+			if (ifcp->ifc_flags != ifr.ifr_flags) {
+				trace(1, "%s: <%s> -> ", ifcp->ifc_name,
+					ifflags(ifcp->ifc_flags));
+				trace(1, "<%s>\n", ifflags(ifr.ifr_flags));
+			}
+			ifcp->ifc_flags = ifr.ifr_flags;
+		}
+		ifconfig1(ifrp, ifcp, s);
+		if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP
+		 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) {
+			mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr;
+			mreq.ipv6mr_interface = ifcp->ifc_index;
+			if (setsockopt(ripsock, IPPROTO_IPV6,
+				IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) < 0)
+				fatal("IPV6_JOIN_GROUP");
+			trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST);
+			ifcp->ifc_joined++;
+		}
+skip:
+		i += IFNAMSIZ;
+		if (ifrp->ifr_addr.sa_len > sizeof(struct sockaddr))
+			i += ifrp->ifr_addr.sa_len;
+		else
+			i += sizeof(struct sockaddr);
+	}
+	close(s);
+	free(buf);
+}
+
+void
+ifconfig1(ifrp, ifcp, s)
+	struct	ifreq *ifrp;
+	struct	ifc *ifcp;
+	int	s;
+{
+	struct	in6_ifreq ifr;
+	struct	sockaddr_in6 *sin;
+	struct	ifac *ifa;
+	int	plen;
+	char	buf[BUFSIZ];
+
+	sin = (struct sockaddr_in6 *)&ifrp->ifr_addr;
+	ifr.ifr_addr = *sin;
+	strcpy(ifr.ifr_name, ifrp->ifr_name);
+	if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0)
+		fatal("ioctl: SIOCGIFNETMASK_IN6");
+	plen = mask2len(&ifr.ifr_addr.sin6_addr, 16);
+	if ((ifa = ifa_match(ifcp, &sin->sin6_addr, plen)) != NULL) {
+		/* same interface found */
+		/* need check if something changed */
+		/* XXX not yet implemented */
+		return;
+	}
+	/*
+	 * New address is found
+	 */
+	if ((ifa = MALLOC(struct ifac)) == NULL)
+		fatal("malloc: struct ifac");
+	ifa->ifa_conf = ifcp;
+	ifa->ifa_next = ifcp->ifc_addr;
+	ifcp->ifc_addr = ifa;
+	ifa->ifa_addr = sin->sin6_addr;
+	ifa->ifa_plen = plen;
+	if (ifcp->ifc_flags & IFF_POINTOPOINT) {
+		ifr.ifr_addr = *sin;
+		if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0)
+			fatal("ioctl: SIOCGIFDSTADDR_IN6");
+		ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;
+		inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf));
+		trace(1, "found address %s/%d -- %s\n",
+			inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf);
+	} else {
+		trace(1, "found address %s/%d\n",
+			inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen);
+	}
+	if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
+		ifcp->ifc_mylladdr = ifa->ifa_addr;
+		ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr);
+		memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
+		SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr,
+			ifcp->ifc_index);
+		setindex2ifc(ifcp->ifc_index, ifcp);
+		ifcp->ifc_mtu = getifmtu(ifcp->ifc_index);
+		if (ifcp->ifc_mtu > RIP6_MAXMTU)
+			ifcp->ifc_mtu = RIP6_MAXMTU;
+		if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0)
+			fatal("ioctl: SIOCGIFMETRIC");
+		ifcp->ifc_metric = ifr.ifr_metric;
+		trace(1, "\tindex: %d, mtu: %d, metric: %d\n",
+			ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric);
+	}
+}
+
+/*
+ * Receive and process routing messages.
+ * Update interface information as necesssary.
+ */
+void
+rtrecv()
+{
+	char buf[BUFSIZ];
+	char *p, *q;
+	struct rt_msghdr *rtm;
+	struct ifa_msghdr *ifam;
+	struct if_msghdr *ifm;
+	int len;
+	struct ifc *ifcp;
+	int iface = 0, rtable = 0;
+	struct sockaddr_in6 *rta[RTAX_MAX];
+	int i, addrs;
+
+	if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
+		perror("read from rtsock");
+		exit(-1);
+	}
+	if (len < sizeof(*rtm)) {
+		trace(1, "short read from rtsock: %d (should be > %d)\n",
+			len, sizeof(*rtm));
+		return;
+	}
+
+	for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) {
+		/* safety against bogus message */
+		if (((struct rt_msghdr *)p)->rtm_msglen <= 0) {
+			trace(1, "bogus rtmsg: length=%d\n",
+				((struct rt_msghdr *)p)->rtm_msglen);
+			break;
+		}
+		rtm = NULL;
+		ifam = NULL;
+		ifm = NULL;
+		switch (((struct rt_msghdr *)p)->rtm_type) {
+		case RTM_NEWADDR:
+		case RTM_DELADDR:
+			ifam = (struct ifa_msghdr *)p;
+			addrs = ifam->ifam_addrs;
+			q = (char *)(ifam + 1);
+			break;
+		case RTM_IFINFO:
+			ifm = (struct if_msghdr *)p;
+			addrs = ifm->ifm_addrs;
+			q = (char *)(ifm + 1);
+			break;
+		default:
+			rtm = (struct rt_msghdr *)p;
+			addrs = rtm->rtm_addrs;
+			q = (char *)(rtm + 1);
+			if (rtm->rtm_version != RTM_VERSION) {
+				trace(1, "unexpected rtmsg version %d "
+					"(should be %d)\n",
+					rtm->rtm_version, RTM_VERSION);
+				continue;
+			}
+			if (rtm->rtm_pid == pid) {
+#if 0
+				trace(1, "rtmsg looped back to me, ignored\n");
+#endif
+				continue;
+			}
+			break;
+		}
+		memset(&rta, 0, sizeof(rta));
+		for (i = 0; i < RTAX_MAX; i++) {
+			if (addrs & (1 << i)) {
+				rta[i] = (struct sockaddr_in6 *)q;
+				q += ROUNDUP(rta[i]->sin6_len);
+			}
+		}
+
+		trace(1, "rtsock: %s (addrs=%x)\n",
+			rttypes((struct rt_msghdr *)p), addrs);
+		if (dflag >= 2) {
+			int i;
+			for (i = 0;
+			     i < ((struct rt_msghdr *)p)->rtm_msglen;
+			     i++) {
+				fprintf(stderr, "%02x ", p[i] & 0xff);
+				if (i % 16 == 15) fprintf(stderr, "\n");
+			}
+			fprintf(stderr, "\n");
+		}
+
+		/*
+		 * Easy ones first.
+		 *
+		 * We may be able to optimize by using ifm->ifm_index or
+		 * ifam->ifam_index.  For simplicity we don't do that here.
+		 */
+		switch (((struct rt_msghdr *)p)->rtm_type) {
+		case RTM_NEWADDR:
+		case RTM_IFINFO:
+			iface++;
+			continue;
+		case RTM_ADD:
+			rtable++;
+			continue;
+		case RTM_LOSING:
+		case RTM_MISS:
+		case RTM_RESOLVE:
+		case RTM_GET:
+		case RTM_LOCK:
+			/* nothing to be done here */
+			trace(1, "\tnothing to be done, ignored\n");
+			continue;
+		}
+
+#if 0
+		if (rta[RTAX_DST] == NULL) {
+			trace(1, "\tno destination, ignored\n");
+			continue;
+		}
+		if (rta[RTAX_DST]->sin6_family != AF_INET6) {
+			trace(1, "\taf mismatch, ignored\n");
+			continue;
+		}
+		if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) {
+			trace(1, "\tlinklocal destination, ignored\n");
+			continue;
+		}
+		if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) {
+			trace(1, "\tloopback destination, ignored\n");
+			continue;		/* Loopback */
+		}
+		if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) {
+			trace(1, "\tmulticast destination, ignored\n");
+			continue;
+		}
+#endif
+
+		/* hard ones */
+		switch (((struct rt_msghdr *)p)->rtm_type) {
+		case RTM_NEWADDR:
+		case RTM_IFINFO:
+		case RTM_ADD:
+		case RTM_LOSING:
+		case RTM_MISS:
+		case RTM_RESOLVE:
+		case RTM_GET:
+		case RTM_LOCK:
+			/* should already be handled */
+			fatal("rtrecv: never reach here");
+		case RTM_DELETE:
+			if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]
+			 || !rta[RTAX_NETMASK]) {
+				trace(1, "\tsome of dst/gw/netamsk are unavailable, ignored\n");
+				break;
+			}
+			if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY], rta[RTAX_NETMASK]) == 0) {
+				rtable++;	/*just to be sure*/
+			}
+			break;
+		case RTM_CHANGE:
+		case RTM_REDIRECT:
+			trace(1, "\tnot supported yet, ignored\n");
+			break;
+		case RTM_DELADDR:
+			if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) {
+				trace(1, "\tno netmask or ifa given, ignored\n");
+				break;
+			}
+			if (ifam->ifam_index < nindex2ifc)
+				ifcp = index2ifc[ifam->ifam_index];
+			else
+				ifcp = NULL;
+			if (!ifcp) {
+				trace(1, "\tinvalid ifam_index %d, ignored\n",
+					ifam->ifam_index);
+				break;
+			}
+			rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK]);
+			iface++;
+			break;
+		case RTM_OLDADD:
+		case RTM_OLDDEL:
+			trace(1, "\tnot supported yet, ignored\n");
+			break;
+		}
+
+	}
+
+	if (iface) {
+		trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n");
+		ifconfig();
+		for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
+			ifrt(ifcp, 1);
+	}
+	if (rtable) {
+		trace(1, "rtsock: read routing table again\n");
+		krtread(1);
+	}
+}
+
+/*
+ * remove specified route from the internal routing table.
+ */
+int
+rt_del(sdst, sgw, smask)
+	const struct sockaddr_in6 *sdst;
+	const struct sockaddr_in6 *sgw;
+	const struct sockaddr_in6 *smask;
+{
+	const struct in6_addr *dst = NULL;
+	const struct in6_addr *gw = NULL;
+	int prefix;
+	struct netinfo6 ni6;
+	struct riprt *rrt = NULL;
+	time_t t_lifetime;
+
+	if (sdst->sin6_family != AF_INET6) {
+		trace(1, "\tother AF, ignored\n");
+		return -1;
+	}
+	if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr)
+	 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback)
+	 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) {
+		trace(1, "\taddress %s not interesting, ignored\n",
+			inet6_n2p(&sdst->sin6_addr));
+		return -1;
+	}
+	dst = &sdst->sin6_addr;
+	if (sgw->sin6_family == AF_INET6
+	 && smask->sin6_family == AF_INET6) {
+		/* easy case */
+		gw = &sgw->sin6_addr;
+		prefix = mask2len(&smask->sin6_addr, 16);
+	} else if (sgw->sin6_family == AF_LINK) {
+		/*
+		 * Interface route... a hard case.  We need to get the prefix
+		 * length from the kernel, but we now are parsing rtmsg.
+		 * We'll purge matching routes from my list, then get the
+		 * fresh list.
+		 */
+		struct riprt *longest;
+		trace(1, "\t%s is a interface route, guessing prefixlen\n",
+			inet6_n2p(dst));
+		longest = NULL;
+		for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
+			if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
+					&sdst->sin6_addr)
+			 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
+				if (!longest
+				 || longest->rrt_info.rip6_plen <
+						 rrt->rrt_info.rip6_plen) {
+					longest = rrt;
+				}
+			}
+		}
+		rrt = longest;
+		if (!rrt) {
+			trace(1, "\tno matching interface route found\n");
+			return -1;
+		}
+		gw = &in6addr_loopback;
+		prefix = rrt->rrt_info.rip6_plen;
+	} else {
+		trace(1, "\tunsupported af: (gw=%d, mask=%d)\n",
+			sgw->sin6_family, smask->sin6_family);
+		return -1;
+	}
+
+	trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix);
+	trace(1, "gw %s\n", inet6_n2p(gw));
+	t_lifetime = time(NULL) - RIP_LIFETIME;
+	/* age route for interface address */
+	memset(&ni6, 0, sizeof(ni6));
+	ni6.rip6_dest = *dst;
+	ni6.rip6_plen = prefix;
+	applyplen(&ni6.rip6_dest, ni6.rip6_plen);	/*to be sure*/
+	trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest),
+		ni6.rip6_plen);
+	if (!rrt && (rrt = rtsearch(&ni6)) == NULL) {
+		trace(1, "\tno route found\n");
+		return -1;
+	}
+	if ((rrt->rrt_flags & RTF_STATIC) == 0) {
+		trace(1, "\tyou can delete static routes only\n");
+	} else if (memcmp(&rrt->rrt_gw, gw, sizeof(rrt->rrt_gw)) != 0) {
+		trace(1, "\tgw mismatch: %s <-> ",
+			inet6_n2p(&rrt->rrt_gw));
+		trace(1, "%s\n", inet6_n2p(gw));
+	} else {
+		trace(1, "\troute found, age it\n");
+		if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
+			rrt->rrt_t = t_lifetime;
+			rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
+		}
+	}
+	return 0;
+}
+
+/*
+ * remove specified address from internal interface/routing table.
+ */
+int
+rt_deladdr(ifcp, sifa, smask)
+	struct ifc *ifcp;
+	const struct sockaddr_in6 *sifa;
+	const struct sockaddr_in6 *smask;
+{
+	const struct in6_addr *addr = NULL;
+	int prefix;
+	struct ifac *ifa = NULL;
+	struct netinfo6 ni6;
+	struct riprt *rrt = NULL;
+	time_t t_lifetime;
+	int updated = 0;
+
+	if (sifa->sin6_family != AF_INET6 || smask->sin6_family != AF_INET6) {
+		trace(1, "\tother AF, ignored\n");
+		return -1;
+	}
+	addr = &sifa->sin6_addr;
+	prefix = mask2len(&smask->sin6_addr, 16);
+
+	trace(1, "\tdeleting %s/%d from %s\n",
+		inet6_n2p(addr), prefix, ifcp->ifc_name);
+	ifa = ifa_match(ifcp, addr, prefix);
+	if (!ifa) {
+		trace(1, "\tno matching ifa found for %s/%d on %s\n",
+			inet6_n2p(addr), prefix, ifcp->ifc_name);
+		return -1;
+	}
+	if (ifa->ifa_conf != ifcp) {
+		trace(1, "\taddress table corrupt: back pointer does not match "
+			"(%s != %s)\n",
+			ifcp->ifc_name, ifa->ifa_conf->ifc_name);
+		return -1;
+	}
+	/* remove ifa from interface */
+	if (ifcp->ifc_addr == ifa)
+		ifcp->ifc_addr = ifa->ifa_next;
+	else {
+		struct ifac *p;
+		for (p = ifcp->ifc_addr; p; p = p->ifa_next) {
+			if (p->ifa_next == ifa) {
+				p->ifa_next = ifa->ifa_next;
+				break;
+			}
+		}
+	}
+	ifa->ifa_next = NULL;
+	ifa->ifa_conf = NULL;
+	t_lifetime = time(NULL) - RIP_LIFETIME;
+	/* age route for interface address */
+	memset(&ni6, 0, sizeof(ni6));
+	ni6.rip6_dest = ifa->ifa_addr;
+	ni6.rip6_plen = ifa->ifa_plen;
+	applyplen(&ni6.rip6_dest, ni6.rip6_plen);
+	trace(1, "\tfind interface route %s/%d on %d\n",
+		inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index);
+	if ((rrt = rtsearch(&ni6)) != NULL) {
+		struct in6_addr none;
+		memset(&none, 0, sizeof(none));
+		if (rrt->rrt_index == ifcp->ifc_index
+		 && memcmp(&rrt->rrt_gw, &none, sizeof(rrt->rrt_gw)) == 0) {
+			trace(1, "\troute found, age it\n");
+			if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
+				rrt->rrt_t = t_lifetime;
+				rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
+			}
+			updated++;
+		} else {
+			trace(1, "\tnon-interface route found: %s/%d on %d\n",
+				inet6_n2p(&rrt->rrt_info.rip6_dest),
+				rrt->rrt_info.rip6_plen,
+				rrt->rrt_index);
+		}
+	} else
+		trace(1, "\tno interface route found\n");
+	/* age route for p2p destination */
+	if (ifcp->ifc_flags & IFF_POINTOPOINT) {
+		memset(&ni6, 0, sizeof(ni6));
+		ni6.rip6_dest = ifa->ifa_raddr;
+		ni6.rip6_plen = 128;
+		applyplen(&ni6.rip6_dest, ni6.rip6_plen);	/*to be sure*/
+		trace(1, "\tfind p2p route %s/%d on %d\n",
+			inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen,
+			ifcp->ifc_index);
+		if ((rrt = rtsearch(&ni6)) != NULL) {
+			if (rrt->rrt_index == ifcp->ifc_index
+			 && memcmp(&rrt->rrt_gw, &ifa->ifa_addr,
+					 sizeof(rrt->rrt_gw)) == 0) {
+				trace(1, "\troute found, age it\n");
+				if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
+					rrt->rrt_t = t_lifetime;
+					rrt->rrt_info.rip6_metric =
+						HOPCNT_INFINITY6;
+					updated++;
+				}
+			} else {
+				trace(1, "\tnon-p2p route found: %s/%d on %d\n",
+					inet6_n2p(&rrt->rrt_info.rip6_dest),
+					rrt->rrt_info.rip6_plen,
+					rrt->rrt_index);
+			}
+		} else
+			trace(1, "\tno p2p route found\n");
+	}
+	return updated ? 0 : -1;
+}
+
+/*
+ * Get each interface address and put those interface routes to the route
+ * list.
+ */
+void
+ifrt(ifcp, again)
+	struct	ifc *ifcp;
+	int again;
+{
+	struct	ifac *ifa;
+	struct	riprt *rrt;
+	struct	netinfo6 *np;
+
+	if (ifcp->ifc_flags & IFF_LOOPBACK)
+		return;			/* ignore loopback */
+	for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
+		if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr))
+			continue;	/* don't advertise link local addr */
+		if ((rrt = MALLOC(struct riprt)) == NULL)
+			fatal("malloc: struct riprt");
+		rrt->rrt_same = NULL;
+		rrt->rrt_index = ifcp->ifc_index;
+		rrt->rrt_t = 0;	/* don't age */
+		rrt->rrt_info.rip6_dest = ifa->ifa_addr;
+		rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
+		rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
+		rrt->rrt_info.rip6_plen = ifa->ifa_plen;
+		applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen);
+		memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
+		np = &rrt->rrt_info;
+		if (rtsearch(np) == NULL) {
+			/* Attach the route to the list */
+			rrt->rrt_next = riprt;
+			riprt = rrt;
+		} else {
+			/* Already found */
+			if (!again) {
+				trace(1, "route: %s/%d: already registered\n",
+					inet6_n2p(&np->rip6_dest),
+					np->rip6_plen);
+			}
+			free(rrt);
+		}
+
+		if (ifcp->ifc_flags & IFF_POINTOPOINT) {
+			if ((rrt = MALLOC(struct riprt)) == NULL)
+				fatal("malloc: struct riprt");
+			rrt->rrt_same = NULL;
+			rrt->rrt_index = ifcp->ifc_index;
+			rrt->rrt_t = 0;	/* Don't age */
+			rrt->rrt_info.rip6_dest = ifa->ifa_raddr;
+			rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
+			rrt->rrt_info.rip6_metric = 1;
+			rrt->rrt_info.rip6_plen = 128;
+			rrt->rrt_gw = ifa->ifa_addr;
+			rrt->rrt_flags |= RTF_NOADVERTISE;
+			np = &rrt->rrt_info;
+			if (rtsearch(np) == NULL) {
+				/* Attach the route to the list */
+				rrt->rrt_next = riprt;
+				riprt = rrt;
+			} else {
+				/* Already found */
+				if (!again) {
+					trace(1, "route: %s/%d: already registered\n",
+						inet6_n2p(&np->rip6_dest),
+						np->rip6_plen);
+				}
+				free(rrt);
+			}
+		}
+	}
+}
+
+int
+getifmtu(ifindex)
+	int	ifindex;
+{
+	int	mib[6];
+	char	*buf;
+	size_t	msize;
+	struct	if_msghdr *ifm;
+	int	mtu;
+
+	mib[0] = CTL_NET;
+	mib[1] = PF_ROUTE;
+	mib[2] = 0;
+	mib[3] = AF_INET6;
+	mib[4] = NET_RT_IFLIST;
+	mib[5] = ifindex;
+	if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0)
+		fatal("sysctl estimate NET_RT_IFLIST");
+	if ((buf = malloc(msize)) == NULL)
+		fatal("malloc");
+	if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0)
+		fatal("sysctl NET_RT_IFLIST");
+	ifm = (struct if_msghdr *)buf;
+	mtu = ifm->ifm_data.ifi_mtu;
+#ifdef	__FREEBSD__
+	if (ifindex != ifm->ifm_index)
+		fatal("ifindex does not match with ifm_index");
+#endif	/* __FREEBSD__ */
+	free(buf);
+	return mtu;
+}
+
+const char *
+rttypes(rtm)
+	struct rt_msghdr *rtm;
+{
+#define	RTTYPE(s, f)	if (rtm->rtm_type == (f)) return (s)
+	RTTYPE("ADD", RTM_ADD);
+	RTTYPE("DELETE", RTM_DELETE);
+	RTTYPE("CHANGE", RTM_CHANGE);
+	RTTYPE("GET", RTM_GET);
+	RTTYPE("LOSING", RTM_LOSING);
+	RTTYPE("REDIRECT", RTM_REDIRECT);
+	RTTYPE("MISS", RTM_MISS);
+	RTTYPE("LOCK", RTM_LOCK);
+	RTTYPE("OLDADD", RTM_OLDADD);
+	RTTYPE("OLDDEL", RTM_OLDDEL);
+	RTTYPE("RESOLVE", RTM_RESOLVE);
+	RTTYPE("NEWADDR", RTM_NEWADDR);
+	RTTYPE("DELADDR", RTM_DELADDR);
+	RTTYPE("IFINFO", RTM_IFINFO);
+#undef RTTYPE
+	return NULL;
+}
+
+const char *
+rtflags(rtm)
+	struct rt_msghdr *rtm;
+{
+	static char buf[BUFSIZ];
+
+	strcpy(buf, "");
+#define	RTFLAG(s, f)	if (rtm->rtm_flags & (f)) strcat(buf, (s))
+	RTFLAG("U", RTF_UP);
+	RTFLAG("G", RTF_GATEWAY);
+	RTFLAG("H", RTF_HOST);
+	RTFLAG("R", RTF_REJECT);
+	RTFLAG("D", RTF_DYNAMIC);
+	RTFLAG("M", RTF_MODIFIED);
+	RTFLAG("d", RTF_DONE);
+#ifdef	RTF_MASK
+	RTFLAG("m", RTF_MASK);
+#endif
+	RTFLAG("C", RTF_CLONING);
+	RTFLAG("X", RTF_XRESOLVE);
+	RTFLAG("L", RTF_LLINFO);
+	RTFLAG("S", RTF_STATIC);
+	RTFLAG("B", RTF_BLACKHOLE);
+	RTFLAG("2", RTF_PROTO2);
+	RTFLAG("1", RTF_PROTO1);
+#undef RTFLAG
+	return buf;
+}
+
+const char *
+ifflags(flags)
+	int flags;
+{
+	static char buf[BUFSIZ];
+
+	strcpy(buf, "");
+#define	IFFLAG(s, f)	\
+	if (flags & f) { if (buf[0]) strcat(buf, ","); strcat(buf, s); }
+	IFFLAG("UP", IFF_UP);
+	IFFLAG("BROADCAST", IFF_BROADCAST);
+	IFFLAG("DEBUG", IFF_DEBUG);
+	IFFLAG("LOOPBACK", IFF_LOOPBACK);
+	IFFLAG("POINTOPOINT", IFF_POINTOPOINT);
+#ifdef IFF_NOTRAILERS
+	IFFLAG("NOTRAILERS", IFF_NOTRAILERS);
+#endif
+	IFFLAG("RUNNING", IFF_RUNNING);
+	IFFLAG("NOARP", IFF_NOARP);
+	IFFLAG("PROMISC", IFF_PROMISC);
+	IFFLAG("ALLMULTI", IFF_ALLMULTI);
+	IFFLAG("OACTIVE", IFF_OACTIVE);
+	IFFLAG("SIMPLEX", IFF_SIMPLEX);
+	IFFLAG("LINK0", IFF_LINK0);
+	IFFLAG("LINK1", IFF_LINK1);
+	IFFLAG("LINK2", IFF_LINK2);
+	IFFLAG("MULTICAST", IFF_MULTICAST);
+#undef IFFLAG
+	return buf;
+}
+
+void
+krtread(again)
+	int again;
+{
+	int mib[6];
+	size_t msize;
+	char *buf, *p, *lim;
+	struct rt_msghdr *rtm;
+	int retry;
+	const char *errmsg;
+
+	retry = 0;
+	buf = NULL;
+	mib[0] = CTL_NET;
+	mib[1] = PF_ROUTE;
+	mib[2] = 0;
+	mib[3] = AF_INET6;	/* Address family */
+	mib[4] = NET_RT_DUMP;	/* Dump the kernel routing table */
+	mib[5] = 0;		/* No flags */
+	do {
+		retry++;
+		errmsg = NULL;
+		if (buf)
+			free(buf);
+		if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
+			errmsg = "sysctl estimate";
+			continue;
+		}
+		if ((buf = malloc(msize)) == NULL) {
+			errmsg = "malloc";
+			continue;
+		}
+		if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
+			errmsg = "sysctl NET_RT_DUMP";
+			continue;
+		}
+	} while (retry < 5 && errmsg != NULL);
+	if (errmsg)
+		fatal("%s (with %d retries, msize=%d)", errmsg, retry, msize);
+	else if (1 < retry)
+		syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry);
+
+	lim = buf + msize;
+	for (p = buf; p < lim; p += rtm->rtm_msglen) {
+		rtm = (struct rt_msghdr *)p;
+		rt_entry(rtm, again);
+	}
+	free(buf);
+}
+
+void
+rt_entry(rtm, again)
+	struct rt_msghdr *rtm;
+	int again;
+{
+	struct	sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask;
+	struct	sockaddr_in6 *sin6_genmask, *sin6_ifp;
+	char	*rtmp, *ifname = NULL;
+	char	buf[BUFSIZ];
+	struct	riprt *rrt;
+	struct	netinfo6 *np;
+	int	s;
+
+	sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0;
+	if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
+		(RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE))
+		return;		/* not interested in the link route */
+	rtmp = (char *)(rtm + 1);
+	/* Destination */
+	if ((rtm->rtm_addrs & RTA_DST) == 0)
+		return;		/* ignore routes without destination address */
+	sin6_dst = (struct sockaddr_in6 *)rtmp;
+	rtmp += sin6_dst->sin6_len;
+	if (rtm->rtm_addrs & RTA_GATEWAY) {
+		sin6_gw = (struct sockaddr_in6 *)rtmp;
+		rtmp += ROUNDUP(sin6_gw->sin6_len);
+	}
+	if (rtm->rtm_addrs & RTA_NETMASK) {
+		sin6_mask = (struct sockaddr_in6 *)rtmp;
+		rtmp += ROUNDUP(sin6_mask->sin6_len);
+	}
+	if (rtm->rtm_addrs & RTA_GENMASK) {
+		sin6_genmask = (struct sockaddr_in6 *)rtmp;
+		rtmp += ROUNDUP(sin6_genmask->sin6_len);
+	}
+	if (rtm->rtm_addrs & RTA_IFP) {
+		sin6_ifp = (struct sockaddr_in6 *)rtmp;
+		rtmp += ROUNDUP(sin6_ifp->sin6_len);
+	}
+
+	/* Destination */
+	if (sin6_dst->sin6_family != AF_INET6)
+		return;
+	if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr))
+		return;		/* Link-local */
+	if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback))
+		return;		/* Loopback */
+	if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr))
+		return;
+
+	if ((rrt = MALLOC(struct riprt)) == NULL)
+		fatal("malloc: struct riprt");
+	np = &rrt->rrt_info;
+	rrt->rrt_same = NULL;
+	rrt->rrt_t = time(NULL);
+	if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC))
+		rrt->rrt_t = 0;	/* Don't age static routes */
+#if 0
+	np->rip6_tag = htons(routetag & 0xffff);
+#else
+	np->rip6_tag = 0;
+#endif
+	np->rip6_metric = rtm->rtm_rmx.rmx_hopcount;
+	if (np->rip6_metric < 1)
+		np->rip6_metric = 1;
+	rrt->rrt_flags = rtm->rtm_flags;
+	np->rip6_dest = sin6_dst->sin6_addr;
+
+	/* Mask or plen */
+	if (rtm->rtm_flags & RTF_HOST)
+		np->rip6_plen = 128;	/* Host route */
+	else if (sin6_mask) {
+		np->rip6_plen = mask2len(&sin6_mask->sin6_addr,
+			sin6_mask->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
+	} else
+		np->rip6_plen = 0;
+
+	if (rtsearch(np)) {
+		/* Already found */
+		if (!again) {
+			trace(1, "route: %s/%d flags %s: already registered\n",
+				inet6_n2p(&np->rip6_dest), np->rip6_plen,
+				rtflags(rtm));
+		}
+		free(rrt);
+		return;
+	}
+	/* Gateway */
+	if (!sin6_gw)
+		memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
+	else {
+		if (sin6_gw->sin6_family == AF_INET6)
+			rrt->rrt_gw = sin6_gw->sin6_addr;
+		else if (sin6_gw->sin6_family == AF_LINK) {
+			/* XXX in case ppp link? */
+			rrt->rrt_gw = in6addr_loopback;
+		} else
+			memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
+	}
+	trace(1, "route: %s/%d flags %s",
+		inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm));
+	trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw));
+
+	/* Interface */
+	s = rtm->rtm_index;
+	if (s < nindex2ifc && index2ifc[s])
+		ifname = index2ifc[s]->ifc_name;
+	else
+		fatal("Unknown interface %d", s);
+	trace(1, " if %s sock %d\n", ifname, s);
+	rrt->rrt_index = s;
+
+	/* Check gateway */
+	if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
+	    !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)
+#ifdef __FreeBSD__
+	 && (rrt->rrt_flags & RTF_LOCAL) == 0
+#endif
+	    ) {
+		inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
+			buf, sizeof(buf));
+		trace(0, "***** Gateway %s is not a link-local address.\n",
+			inet6_n2p(&rrt->rrt_gw));
+		trace(0, "*****     dest(%s) if(%s) -- Not optimized.\n",
+			buf, ifname);
+		rrt->rrt_flags |= RTF_NH_NOT_LLADDR;
+	}
+
+	/* Put it to the route list */
+	rrt->rrt_next = riprt;
+	riprt = rrt;
+}
+
+int
+addroute(rrt, gw, ifcp)
+	struct riprt *rrt;
+	const struct in6_addr *gw;
+	struct ifc *ifcp;
+{
+	struct	netinfo6 *np;
+	u_char	buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ];
+	struct	rt_msghdr	*rtm;
+	struct	sockaddr_in6	*sin;
+	int	len;
+
+	np = &rrt->rrt_info;
+	inet_ntop(AF_INET6, (void *)gw, (char *)buf1, sizeof(buf1));
+	inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2));
+	tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n",
+		inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
+		np->rip6_metric - 1, buf2);
+	if (rtlog)
+		fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(),
+			inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
+			np->rip6_metric - 1, buf2);
+	if (nflag)
+		return 0;
+
+	memset(buf, 0, sizeof(buf));
+	rtm = (struct rt_msghdr *)buf;
+	rtm->rtm_type = RTM_ADD;
+	rtm->rtm_version = RTM_VERSION;
+	rtm->rtm_seq = ++seq;
+	rtm->rtm_pid = pid;
+	rtm->rtm_flags = rrt->rrt_flags & RTF_ROUTE_H;
+	rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
+	rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1;
+	rtm->rtm_inits = RTV_HOPCOUNT;
+	sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
+	/* Destination */
+	sin->sin6_len = sizeof(struct sockaddr_in6);
+	sin->sin6_family = AF_INET6;
+	sin->sin6_addr = np->rip6_dest;
+	sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
+	/* Gateway */
+	sin->sin6_len = sizeof(struct sockaddr_in6);
+	sin->sin6_family = AF_INET6;
+	sin->sin6_addr = *gw;
+	sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
+	/* Netmask */
+	sin->sin6_len = sizeof(struct sockaddr_in6);
+	sin->sin6_family = AF_INET6;
+	sin->sin6_addr = *(plen2mask(np->rip6_plen));
+	sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
+
+	len = (char *)sin - (char *)buf;
+	rtm->rtm_msglen = len;
+	if (write(rtsock, buf, len) > 0)
+		return 0;
+
+	if (errno == EEXIST) {
+		trace(0, "ADD: Route already exists %s/%d gw %s\n",
+			inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
+		if (rtlog)
+			fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n",
+				inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
+	} else {
+		trace(0, "Can not write to rtsock (addroute): %s\n",
+			strerror(errno));
+		if (rtlog)
+			fprintf(rtlog, "\tCan not write to rtsock: %s\n",
+				strerror(errno));
+	}
+	return -1;
+}
+
+int
+delroute(np, gw)
+	struct netinfo6 *np;
+	struct in6_addr *gw;
+{
+	u_char	buf[BUFSIZ], buf2[BUFSIZ];
+	struct	rt_msghdr	*rtm;
+	struct	sockaddr_in6	*sin;
+	int	len;
+
+	inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2));
+	tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest),
+		np->rip6_plen, buf2);
+	if (rtlog)
+		fprintf(rtlog, "%s: DEL: %s/%d gw %s\n",
+			hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
+	if (nflag)
+		return 0;
+
+	memset(buf, 0, sizeof(buf));
+	rtm = (struct rt_msghdr *)buf;
+	rtm->rtm_type = RTM_DELETE;
+	rtm->rtm_version = RTM_VERSION;
+	rtm->rtm_seq = ++seq;
+	rtm->rtm_pid = pid;
+	rtm->rtm_flags = RTF_UP | RTF_GATEWAY;
+	rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
+	sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
+	/* Destination */
+	sin->sin6_len = sizeof(struct sockaddr_in6);
+	sin->sin6_family = AF_INET6;
+	sin->sin6_addr = np->rip6_dest;
+	sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
+	/* Gateway */
+	sin->sin6_len = sizeof(struct sockaddr_in6);
+	sin->sin6_family = AF_INET6;
+	sin->sin6_addr = *gw;
+	sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
+	/* Netmask */
+	sin->sin6_len = sizeof(struct sockaddr_in6);
+	sin->sin6_family = AF_INET6;
+	sin->sin6_addr = *(plen2mask(np->rip6_plen));
+	sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
+
+	len = (char *)sin - (char *)buf;
+	rtm->rtm_msglen = len;
+	if (write(rtsock, buf, len) >= 0)
+		return 0;
+
+	if (errno == ESRCH) {
+		trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n",
+			inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
+		if (rtlog)
+			fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n",
+				inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
+	} else {
+		trace(0, "Can not write to rtsock (delroute): %s\n",
+			strerror(errno));
+		if (rtlog)
+			fprintf(rtlog, "\tCan not write to rtsock: %s\n",
+				strerror(errno));
+	}
+	return -1;
+}
+
+struct in6_addr *
+getroute(np, gw)
+	struct netinfo6 *np;
+	struct in6_addr *gw;
+{
+	u_char buf[BUFSIZ];
+	u_long myseq;
+	int len;
+	struct rt_msghdr *rtm;
+	struct sockaddr_in6 *sin;
+
+	rtm = (struct rt_msghdr *)buf;
+	len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6);
+	memset(rtm, 0, len);
+	rtm->rtm_type = RTM_GET;
+	rtm->rtm_version = RTM_VERSION;
+	myseq = ++seq;
+	rtm->rtm_seq = myseq;
+	rtm->rtm_addrs = RTA_DST;
+	rtm->rtm_msglen = len;
+	sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
+	sin->sin6_len = sizeof(struct sockaddr_in6);
+	sin->sin6_family = AF_INET6;
+	sin->sin6_addr = np->rip6_dest;
+	if (write(rtsock, buf, len) < 0) {
+		if (errno == ESRCH)	/* No such route found */
+			return NULL;
+		perror("write to rtsock");
+		exit(-1);
+	}
+	do {
+		if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
+			perror("read from rtsock");
+			exit(-1);
+		}
+		rtm = (struct rt_msghdr *)buf;
+	} while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid);
+	sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
+	if (rtm->rtm_addrs & RTA_DST) {
+		sin = (struct sockaddr_in6 *)
+			((char *)sin + ROUNDUP(sin->sin6_len));
+	}
+	if (rtm->rtm_addrs & RTA_GATEWAY) {
+		*gw = sin->sin6_addr;
+		return gw;
+	}
+	return NULL;
+}
+
+const char *
+inet6_n2p(p)
+	const struct in6_addr *p;
+{
+	static char buf[BUFSIZ];
+
+	return inet_ntop(AF_INET6, (void *)p, buf, sizeof(buf));
+}
+
+void
+ifrtdump(sig)
+	int sig;
+{
+
+	ifdump(sig);
+	rtdump(sig);
+}
+
+void
+ifdump(sig)
+	int sig;
+{
+	struct ifc *ifcp;
+	FILE *dump;
+	int i;
+
+	if (sig == 0)
+		dump = stderr;
+	else
+		if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
+			dump = stderr;
+
+	fprintf(dump, "%s: Interface Table Dump\n", hms());
+	fprintf(dump, "  Number of interfaces: %d\n", nifc);
+	for (i = 0; i < 2; i++) {
+		fprintf(dump, "  %sadvertising interfaces:\n", i ? "non-" : "");
+		for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
+			if (i == 0) {
+				if ((ifcp->ifc_flags & IFF_UP) == 0)
+					continue;
+				if (iff_find(ifcp, 'N') != NULL)
+					continue;
+			} else {
+				if (ifcp->ifc_flags & IFF_UP)
+					continue;
+			}
+			ifdump0(dump, ifcp);
+		}
+	}
+	fprintf(dump, "\n");
+	if (dump != stderr)
+		fclose(dump);
+}
+
+void
+ifdump0(dump, ifcp)
+	FILE *dump;
+	const struct ifc *ifcp;
+{
+	struct ifac *ifa;
+	struct iff *iffp;
+	char buf[BUFSIZ];
+	const char *ft;
+	int addr;
+
+	fprintf(dump, "    %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n",
+		ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags),
+		inet6_n2p(&ifcp->ifc_mylladdr),
+		ifcp->ifc_mtu, ifcp->ifc_metric);
+	for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
+		if (ifcp->ifc_flags & IFF_POINTOPOINT) {
+			inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr,
+				buf, sizeof(buf));
+			fprintf(dump, "\t%s/%d -- %s\n",
+				inet6_n2p(&ifa->ifa_addr),
+				ifa->ifa_plen, buf);
+		} else {
+			fprintf(dump, "\t%s/%d\n",
+				inet6_n2p(&ifa->ifa_addr),
+				ifa->ifa_plen);
+		}
+	}
+	if (ifcp->ifc_filter) {
+		fprintf(dump, "\tFilter:");
+		for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
+			addr = 0;
+			switch (iffp->iff_type) {
+			case 'A':
+				ft = "Aggregate"; addr++; break;
+			case 'N':
+				ft = "No-advertise"; break;
+			case 'O':
+				ft = "Advertise-only"; addr++; break;
+			case 'T':
+				ft = "Default-only"; break;
+			case 'L':
+				ft = "Listen-only"; addr++; break;
+			default:
+				snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
+				ft = buf;
+				addr++;
+				break;
+			}
+			fprintf(dump, " %s", ft);
+			if (addr) {
+				fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr),
+					iffp->iff_plen);
+			}
+		}
+		fprintf(dump, "\n");
+	}
+}
+
+void
+rtdump(sig)
+	int sig;
+{
+	struct	riprt *rrt;
+	char	buf[BUFSIZ];
+	FILE	*dump;
+	time_t	t, age;
+
+	if (sig == 0)
+		dump = stderr;
+	else
+		if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
+			dump = stderr;
+
+	t = time(NULL);
+	fprintf(dump, "\n%s: Routing Table Dump\n", hms());
+	for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
+		if (rrt->rrt_t == 0)
+			age = 0;
+		else
+			age = t - rrt->rrt_t;
+		inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
+			buf, sizeof(buf));
+		fprintf(dump, "    %s/%d if(%d:%s) gw(%s) [%d] age(%ld)",
+			buf, rrt->rrt_info.rip6_plen, rrt->rrt_index,
+			index2ifc[rrt->rrt_index]->ifc_name,
+			inet6_n2p(&rrt->rrt_gw),
+			rrt->rrt_info.rip6_metric, (long)age);
+		if (rrt->rrt_info.rip6_tag) {
+			fprintf(dump, " tag(0x%04x)",
+				ntohs(rrt->rrt_info.rip6_tag) & 0xffff);
+		}
+		if (rrt->rrt_flags & RTF_NH_NOT_LLADDR)
+			fprintf(dump, " NOT-LL");
+		if (rrt->rrt_flags & RTF_NOADVERTISE)
+			fprintf(dump, " NO-ADV");
+		fprintf(dump, "\n");
+	}
+	fprintf(dump, "\n");
+	if (dump != stderr)
+		fclose(dump);
+}
+
+/*
+ * Parse the -A (and -O) options and put corresponding filter object to the
+ * specified interface structures. Each of the -A/O option has the following
+ * syntax:	-A 5f09:c400::/32,ef0,ef1  (aggregate)
+ * 		-O 5f09:c400::/32,ef0,ef1  (only when match)
+ */
+void
+filterconfig()
+{
+	int i;
+	char *p, *ap, *iflp, *ifname;
+	struct	iff ftmp, *iff_obj;
+	struct	ifc *ifcp;
+	struct	riprt *rrt;
+	struct	in6_addr gw;
+
+	for (i = 0; i < nfilter; i++) {
+		ap = filter[i];
+		iflp = NULL;
+		ifcp = NULL;
+		if (filtertype[i] == 'N' || filtertype[i] == 'T') {
+			iflp = ap;
+			goto ifonly;
+		}
+		if ((p = index(ap, ',')) != NULL) {
+			*p++ = '\0';
+			iflp = p;
+		}
+		if ((p = index(ap, '/')) == NULL)
+			fatal("no prefixlen specified for '%s'", ap);
+		*p++ = '\0';
+		if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1)
+			fatal("invalid prefix specified for '%s'", ap);
+		ftmp.iff_plen = atoi(p);
+		ftmp.iff_next = NULL;
+		applyplen(&ftmp.iff_addr, ftmp.iff_plen);
+ifonly:
+		ftmp.iff_type = filtertype[i];
+		if (iflp == NULL || *iflp == '\0')
+			fatal("no interface specified for '%s'", ap);
+		/* parse the interface listing portion */
+		while (iflp) {
+			ifname = iflp;
+			if ((iflp = index(iflp, ',')) != NULL)
+				*iflp++ = '\0';
+			ifcp = ifc_find(ifname);
+			if (ifcp == NULL)
+				fatal("no interface %s exists", ifname);
+			iff_obj = (struct iff *)malloc(sizeof(struct iff));
+			if (iff_obj == NULL)
+				fatal("malloc of iff_obj");
+			memcpy((void *)iff_obj, (void *)&ftmp,
+				sizeof(struct iff));
+			/* link it to the interface filter */
+			iff_obj->iff_next = ifcp->ifc_filter;
+			ifcp->ifc_filter = iff_obj;
+		}
+		if (filtertype[i] != 'A')
+			continue;
+		/* put the aggregate to the kernel routing table */
+		rrt = (struct riprt *)malloc(sizeof(struct riprt));
+		if (rrt == NULL)
+			fatal("malloc: rrt");
+		memset(rrt, 0, sizeof(struct riprt));
+		rrt->rrt_info.rip6_dest = ftmp.iff_addr;
+		rrt->rrt_info.rip6_plen = ftmp.iff_plen;
+		rrt->rrt_info.rip6_metric = 1;
+		rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
+		rrt->rrt_gw = in6addr_loopback;
+		rrt->rrt_flags = RTF_UP | RTF_REJECT | RTF_AGGREGATE;
+		rrt->rrt_t = 0;
+		rrt->rrt_index = loopifindex;
+		/* Put the route to the list */
+		rrt->rrt_next = riprt;
+		riprt = rrt;
+		trace(1, "Aggregate: %s/%d for %s\n",
+			inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen,
+			ifcp->ifc_name);
+		/* Add this route to the kernel */
+		if (nflag) 	/* do not modify kernel routing table */
+			continue;
+		if (getroute(&rrt->rrt_info, &gw)) {
+			/*
+			 * When the address has already been registered in the
+			 * kernel routing table, it should be removed
+			 */
+			delroute(&rrt->rrt_info, &gw);
+		}
+		addroute(rrt, &in6addr_loopback, loopifcp);
+	}
+}
+
+/***************** utility functions *****************/
+
+/*
+ * Returns a pointer to ifac whose address and prefix length matches
+ * with the address and prefix length specified in the arguments.
+ */
+struct ifac *
+ifa_match(ifcp, ia, plen)
+	const struct ifc *ifcp;
+	const struct in6_addr *ia;
+	int plen;
+{
+	struct ifac *ifa;
+
+	for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
+		if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) &&
+		    ifa->ifa_plen == plen)
+			break;
+	}
+	return ifa;
+}
+
+/*
+ * Return a pointer to riprt structure whose address and prefix length
+ * matches with the address and prefix length found in the argument.
+ * Note: This is not a rtalloc(). Therefore exact match is necessary.
+ */
+
+struct riprt *
+rtsearch(np)
+	struct	netinfo6 *np;
+{
+	struct	riprt	*rrt;
+
+	for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
+		if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
+		    IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
+				       &np->rip6_dest))
+			return rrt;
+	}
+	return 0;
+}
+
+int
+mask2len(addr, lenlim)
+	const struct in6_addr *addr;
+	int lenlim;
+{
+	int i = 0, j;
+	u_char *p = (u_char *)addr;
+
+	for (j = 0; j < lenlim; j++, p++) {
+		if (*p != 0xff)
+			break;
+		i += 8;
+	}
+	if (j < lenlim) {
+		switch (*p) {
+#define	MASKLEN(m, l)	case m: i += l; break
+		MASKLEN(0xfe, 7);
+		MASKLEN(0xfc, 6);
+		MASKLEN(0xf8, 5);
+		MASKLEN(0xf0, 4);
+		MASKLEN(0xe0, 3);
+		MASKLEN(0xc0, 2);
+		MASKLEN(0x80, 1);
+#undef	MASKLEN
+		}
+	}
+	return i;
+}
+
+void
+applymask(addr, mask)
+	struct in6_addr *addr, *mask;
+{
+	int	i;
+	u_long	*p, *q;
+
+	p = (u_long *)addr; q = (u_long *)mask;
+	for (i = 0; i < 4; i++)
+		*p++ &= *q++;
+}
+
+static const u_char plent[8] = {
+	0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
+};
+
+void
+applyplen(ia, plen)
+	struct	in6_addr *ia;
+	int	plen;
+{
+	u_char	*p;
+	int	i;
+
+	p = ia->s6_addr;
+	for (i = 0; i < 16; i++) {
+		if (plen <= 0)
+			*p = 0;
+		else if (plen < 8)
+			*p &= plent[plen];
+		p++, plen -= 8;
+	}
+}
+
+static const int pl2m[9] = {
+	0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
+};
+
+struct in6_addr *
+plen2mask(n)
+	int	n;
+{
+	static struct in6_addr ia;
+	u_char	*p;
+	int	i;
+
+	memset(&ia, 0, sizeof(struct in6_addr));
+	p = (u_char *)&ia;
+	for (i = 0; i < 16; i++, p++, n -= 8) {
+		if (n >= 8) {
+			*p = 0xff;
+			continue;
+		}
+		*p = pl2m[n];
+		break;
+	}
+	return &ia;
+}
+
+char *
+allocopy(p)
+	char *p;
+{
+	char *q = (char *)malloc(strlen(p) + 1);
+
+	strcpy(q, p);
+	return q;
+}
+
+char *
+hms()
+{
+	static char buf[BUFSIZ];
+	time_t t;
+	struct	tm *tm;
+
+	t = time(NULL);
+	if ((tm = localtime(&t)) == 0)
+		fatal("localtime");
+	snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, tm->tm_sec);
+	return buf;
+}
+
+#define	RIPRANDDEV	1.0	/* 30 +- 15, max - min = 30 */
+
+int
+ripinterval(timer)
+	int timer;
+{
+	double r = rand();
+
+	interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5));
+	nextalarm = time(NULL) + interval;
+	return interval;
+}
+
+time_t
+ripsuptrig()
+{
+	time_t t;
+
+	double r = rand();
+	t  = (int)(RIP_TRIG_INT6_MIN +
+		(RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX ));
+	sup_trig_update = time(NULL) + t;
+	return t;
+}
+
+void
+#ifdef __STDC__
+fatal(const char *fmt, ...)
+#else
+fatal(fmt, va_alist)
+	char	*fmt;
+	va_dcl
+#endif
+{
+	va_list ap;
+	char buf[1024];
+
+#ifdef __STDC__
+	va_start(ap, fmt);
+#else
+	va_start(ap);
+#endif
+	vsnprintf(buf, sizeof(buf), fmt, ap);
+	perror(buf);
+	syslog(LOG_ERR, "%s: %s", buf, strerror(errno));
+	rtdexit(0);
+	va_end(ap);
+}
+
+void
+#ifdef __STDC__
+tracet(int level, const char *fmt, ...)
+#else
+tracet(level, fmt, va_alist)
+	int level;
+	char *fmt;
+	va_dcl
+#endif
+{
+	va_list ap;
+
+#ifdef __STDC__
+	va_start(ap, fmt);
+#else
+	va_start(ap);
+#endif
+	if (level <= dflag) {
+		fprintf(stderr, "%s: ", hms());
+		vfprintf(stderr, fmt, ap);
+	}
+	if (dflag) {
+		if (level > 0)
+			vsyslog(LOG_DEBUG, fmt, ap);
+		else
+			vsyslog(LOG_WARNING, fmt, ap);
+	}
+	va_end(ap);
+}
+
+void
+#ifdef __STDC__
+trace(int level, const char *fmt, ...)
+#else
+trace(level, fmt, va_alist)
+	int level;
+	char *fmt;
+	va_dcl
+#endif
+{
+	va_list ap;
+
+#ifdef __STDC__
+	va_start(ap, fmt);
+#else
+	va_start(ap);
+#endif
+	if (level <= dflag)
+		vfprintf(stderr, fmt, ap);
+	if (dflag) {
+		if (level > 0)
+			vsyslog(LOG_DEBUG, fmt, ap);
+		else
+			vsyslog(LOG_WARNING, fmt, ap);
+	}
+	va_end(ap);
+}
+
+unsigned int
+if_maxindex()
+{
+	struct if_nameindex *p, *p0;
+	unsigned int max = 0;
+
+	p0 = if_nameindex();
+	for (p = p0; p && p->if_index && p->if_name; p++) {
+		if (max < p->if_index)
+			max = p->if_index;
+	}
+	if_freenameindex(p0);
+	return max;
+}
+
+struct ifc *
+ifc_find(name)
+	char *name;
+{
+	struct ifc *ifcp;
+
+	for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
+		if (strcmp(name, ifcp->ifc_name) == 0)
+			return ifcp;
+	}
+	return (struct ifc *)NULL;
+}
+
+struct iff *
+iff_find(ifcp, type)
+	struct ifc *ifcp;
+	int type;
+{
+	struct iff *iffp;
+
+	for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
+		if (iffp->iff_type == type)
+			return iffp;
+	}
+	return NULL;
+}
+
+void
+setindex2ifc(index, ifcp)
+	int index;
+	struct ifc *ifcp;
+{
+	int n;
+
+	if (!index2ifc) {
+		nindex2ifc = 5;	/*initial guess*/
+		index2ifc = (struct ifc **)
+			malloc(sizeof(*index2ifc) * nindex2ifc);
+		if (index2ifc == NULL)
+			fatal("malloc");
+		memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc);
+	}
+	n = nindex2ifc;
+	while (nindex2ifc <= index)
+		nindex2ifc *= 2;
+	if (n != nindex2ifc) {
+		index2ifc = (struct ifc **)
+			realloc(index2ifc, sizeof(*index2ifc) * nindex2ifc);
+		if (index2ifc == NULL)
+			fatal("realloc");
+	}
+	index2ifc[index] = ifcp;
+}