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

8 files changed, 1964 insertions, 0 deletions

diff --git a/usr.sbin/rtsold/Makefile b/usr.sbin/rtsold/Makefile
new file mode 100644
index 0000000..e348b27
--- /dev/null
+++ b/usr.sbin/rtsold/Makefile
@@ -0,0 +1,25 @@
+# Copyright (c) 1996 WIDE Project. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modifications, are permitted provided that the above copyright notice
+# and this paragraph are duplicated in all such forms and that any
+# documentation, advertising materials, and other materials related to
+# such distribution and use acknowledge that the software was developed
+# by the WIDE Project, Japan. The name of the Project may not be used to
+# endorse or promote products derived from this software without
+# specific prior written permission. THIS SOFTWARE IS PROVIDED ``AS IS''
+# AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
+# LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE.
+# $FreeBSD$
+
+PROG=	rtsold
+SRCS=	rtsold.c rtsol.c if.c probe.c dump.c
+CFLAGS+=-DINET6
+LDADD+=	-lkvm
+DPADD+=	${LIBKVM}
+
+MAN8=	rtsold.8
+MLINKS=	rtsold.8 rtsol.8
+
+.include <bsd.prog.mk>
diff --git a/usr.sbin/rtsold/dump.c b/usr.sbin/rtsold/dump.c
new file mode 100644
index 0000000..1587721
--- /dev/null
+++ b/usr.sbin/rtsold/dump.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 1999 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/types.h>
+#include <sys/time.h>
+
+#include <netinet/in.h>
+#include <netinet/icmp6.h>
+
+#include <syslog.h>
+#include <time.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include "rtsold.h"
+
+static FILE *fp;
+
+extern struct ifinfo *iflist;
+
+static char *sec2str __P((time_t));
+char *ifstatstr[] = {"IDLE", "DELAY", "PROBE", "DOWN", "TENTATIVE"};
+
+static void
+dump_interface_status()
+{
+	struct ifinfo *ifinfo;
+	struct timeval now;
+
+	gettimeofday(&now, NULL);
+
+	for (ifinfo = iflist; ifinfo; ifinfo = ifinfo->next) {
+		fprintf(fp, "Interface %s\n", ifinfo->ifname);
+		fprintf(fp, "  probe interval: ");
+		if (ifinfo->probeinterval) {
+			fprintf(fp, "%d\n", ifinfo->probeinterval);
+			fprintf(fp, "  probe timer: %d\n", ifinfo->probetimer);
+		}
+		else {
+			fprintf(fp, "infinity\n");
+			fprintf(fp, "  no probe timer\n");
+		}
+		fprintf(fp, "  interface status: %s\n",
+			ifinfo->active > 0 ? "active" : "inactive");
+		fprintf(fp, "  rtsold status: %s\n", ifstatstr[ifinfo->state]);
+		fprintf(fp, "  carrier detection: %s\n",
+			ifinfo->mediareqok ? "available" : "unavailable");
+		fprintf(fp, "  probes: %d, dadcount = %d\n",
+			ifinfo->probes, ifinfo->dadcount);
+		if (ifinfo->timer.tv_sec == tm_max.tv_sec &&
+		    ifinfo->timer.tv_usec == tm_max.tv_usec)
+			fprintf(fp, "  no timer\n");
+		else {
+			fprintf(fp, "  timer: interval=%d:%d, expire=%s\n",
+				(int)ifinfo->timer.tv_sec,
+				(int)ifinfo->timer.tv_usec,
+				(ifinfo->expire.tv_sec < now.tv_sec) ? "expired"
+				: sec2str(ifinfo->expire.tv_sec - now.tv_sec));
+		}
+		fprintf(fp, "  number of valid RAs: %d\n", ifinfo->racnt);
+	}
+}
+
+void
+rtsold_dump_file(dumpfile)
+	char *dumpfile;
+{
+	if ((fp = fopen(dumpfile, "w")) == NULL) {
+		warnmsg(LOG_WARNING, __FUNCTION__, "open a dump file(%s)",
+			dumpfile, strerror(errno));
+		return;
+	}
+
+	dump_interface_status();
+
+	fclose(fp);
+}
+
+static char *
+sec2str(total)
+	time_t total;
+{
+	static char result[256];
+	int days, hours, mins, secs;
+	int first = 1;
+	char *p = result;
+
+	days = total / 3600 / 24;
+	hours = (total / 3600) % 24;
+	mins = (total / 60) % 60;
+	secs = total % 60;
+
+	if (days) {
+		first = 0;
+		p += sprintf(p, "%dd", days);
+	}
+	if (!first || hours) {
+		first = 0;
+		p += sprintf(p, "%dh", hours);
+	}
+	if (!first || mins) {
+		first = 0;
+		p += sprintf(p, "%dm", mins);
+	}
+	sprintf(p, "%ds", secs);
+
+	return(result);
+}
diff --git a/usr.sbin/rtsold/if.c b/usr.sbin/rtsold/if.c
new file mode 100644
index 0000000..4ac1d4b
--- /dev/null
+++ b/usr.sbin/rtsold/if.c
@@ -0,0 +1,423 @@
+/*
+ * 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/socket.h>
+#include <sys/sysctl.h>
+#include <sys/ioctl.h>
+
+#include <net/if.h>
+#if defined(__FreeBSD__) && __FreeBSD__ >= 3
+#include <net/if_var.h>
+#endif /* __FreeBSD__ >= 3 */
+#include <net/if_types.h>
+#include <net/route.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+#ifdef __FreeBSD__
+# include <net/ethernet.h>
+#endif
+#ifdef __NetBSD__
+#include <net/if_ether.h>
+#endif
+#if defined(__bsdi__) || defined(__OpenBSD__)
+# include <netinet/in.h>
+# include <netinet/if_ether.h>
+#endif
+#include <netinet/in.h>
+#include <netinet/icmp6.h>
+
+#include <netinet6/in6_var.h>
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <kvm.h>
+#include <nlist.h>
+#include <limits.h>
+
+#include "rtsold.h"
+
+static int ifsock;
+
+static int getifa __P((char *name, struct in6_ifaddr *ifap));
+static void get_rtaddrs __P((int addrs, struct sockaddr *sa,
+			     struct sockaddr **rti_info));
+
+int
+ifinit()
+{
+	if ((ifsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "socket: %s", strerror(errno));
+		return(-1);
+	}
+
+	return(0);
+}
+
+int
+interface_up(char *name)
+{
+	struct ifreq ifr;
+	struct in6_ifaddr ifa;
+
+	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+
+	if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
+		warnmsg(LOG_WARNING, __FUNCTION__, "ioctl(SIOCGIFFLAGS): %s",
+		       strerror(errno));
+		return(-1);
+	}
+	if (!(ifr.ifr_flags & IFF_UP)) {
+		ifr.ifr_flags |= IFF_UP;
+		if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) {
+			warnmsg(LOG_ERR, __FUNCTION__,
+				"ioctl(SIOCSIFFLAGS): %s", strerror(errno));
+		}
+		return(-1);
+	}
+
+	warnmsg(LOG_DEBUG, __FUNCTION__, "checking if %s is ready...", name);
+
+	if (getifa(name, &ifa) < 0) {
+		warnmsg(LOG_WARNING, __FUNCTION__,
+			"getifa() failed, anyway I'll try");
+		return 0;
+	}
+
+	if (!(ifa.ia6_flags & IN6_IFF_NOTREADY)) {
+		warnmsg(LOG_DEBUG, __FUNCTION__,
+			"%s is ready", name);
+		return(0);
+	}
+	else {
+		if (ifa.ia6_flags & IN6_IFF_TENTATIVE) {
+			warnmsg(LOG_DEBUG, __FUNCTION__, "%s is tentative",
+			       name);
+			return IFS_TENTATIVE;
+		}
+		if (ifa.ia6_flags & IN6_IFF_DUPLICATED)
+			warnmsg(LOG_DEBUG, __FUNCTION__, "%s is duplicated",
+			       name);
+		return -1;
+	}
+}
+
+int
+interface_status(struct ifinfo *ifinfo)
+{
+	char *ifname = ifinfo->ifname;
+	struct ifreq ifr;
+	struct ifmediareq ifmr;
+
+	/* get interface flags */
+	memset(&ifr, 0, sizeof(ifr));
+	strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+	if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGIFFLAGS) on %s: %s",
+		       ifname, strerror(errno));
+		return(-1);
+	}
+	/*
+	 * if one of UP and RUNNING flags is dropped,
+	 * the interface is not active.
+	 */
+	if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
+		goto inactive;
+	}
+
+	/* Next, check carrier on the interface, if possible */
+	if (!ifinfo->mediareqok)
+		goto active;
+	memset(&ifmr, 0, sizeof(ifmr));
+	strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
+
+	if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
+		if (errno != EINVAL) {
+			warnmsg(LOG_DEBUG, __FUNCTION__,
+				"ioctl(SIOCGIFMEDIA) on %s: %s",
+			       ifname, strerror(errno));
+			return(-1);
+		}
+		/*
+		 * EINVAL simply means that the interface does not support
+		 * the SIOCGIFMEDIA ioctl. We regard it alive.
+		 */
+		ifinfo->mediareqok = 0;
+		goto active;
+	}
+
+	if (ifmr.ifm_status & IFM_AVALID) {
+		switch(ifmr.ifm_active & IFM_NMASK) {
+		 case IFM_ETHER:
+			 if (ifmr.ifm_status & IFM_ACTIVE)
+				 goto active;
+			 else
+				 goto inactive;
+			 break;
+		 default:
+			 goto inactive;
+		}
+	}
+
+  inactive:
+	return(0);
+
+  active:
+	return(1);
+}
+
+#define	ROUNDUP(a, size) \
+	(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
+
+#define	NEXT_SA(ap) (ap) = (struct sockaddr *) \
+	((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
+						 sizeof(u_long)) :\
+			  			 sizeof(u_long)))
+#define	ROUNDUP8(a) (1 + (((a) - 1) | 7))
+
+int
+lladdropt_length(struct sockaddr_dl *sdl)
+{
+	switch(sdl->sdl_type) {
+	 case IFT_ETHER:
+		 return(ROUNDUP8(ETHER_ADDR_LEN + 2));
+	 default:
+		 return(0);
+	}
+}
+
+void
+lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
+{
+	char *addr;
+
+	ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
+
+	switch(sdl->sdl_type) {
+	 case IFT_ETHER:
+		 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
+		 addr = (char *)(ndopt + 1);
+		 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
+		 break;
+	 default:
+		 warnmsg(LOG_ERR, __FUNCTION__,
+			 "unsupported link type(%d)", sdl->sdl_type);
+		 exit(1);
+	}
+
+	return;
+}
+
+struct sockaddr_dl *
+if_nametosdl(char *name)
+{
+	int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
+	char *buf, *next, *lim;
+	size_t len;
+	struct if_msghdr *ifm;
+	struct sockaddr *sa, *rti_info[RTAX_MAX];
+	struct sockaddr_dl *sdl = NULL, *ret_sdl;
+
+	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
+		return(NULL);
+	if ((buf = malloc(len)) == NULL)
+		return(NULL);
+	if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
+		free(buf);
+		return(NULL);
+	}
+
+	lim = buf + len;
+	for (next = buf; next < lim; next += ifm->ifm_msglen) {
+		ifm = (struct if_msghdr *)next;
+		if (ifm->ifm_type == RTM_IFINFO) {
+			sa = (struct sockaddr *)(ifm + 1);
+			get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
+			if ((sa = rti_info[RTAX_IFP]) != NULL) {
+				if (sa->sa_family == AF_LINK) {
+					sdl = (struct sockaddr_dl *)sa;
+					if (strncmp(&sdl->sdl_data[0],
+						    name,
+						    sdl->sdl_nlen) == 0) {
+						break;
+					}
+				}
+			}
+		}
+	}
+	if (next == lim) {
+		/* search failed */
+		free(buf);
+		return(NULL);
+	}
+
+	if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
+		return(NULL);
+	memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
+
+	return(ret_sdl);
+}
+
+int
+getinet6sysctl(int code)
+{
+	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
+	int value;
+	size_t size;
+
+	mib[3] = code;
+	size = sizeof(value);
+	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
+		return -1;
+	else
+		return value;
+}
+
+/*------------------------------------------------------------*/
+
+static struct nlist nl[] = {
+#define	N_IFNET	0
+	{ "_ifnet" },
+	{ "" },
+};
+
+#define	KREAD(x, y, z) { \
+	if (kvm_read(kvmd, (u_long)x, (void *)y, sizeof(z)) != sizeof(z)) { \
+		warnmsg(LOG_ERR, __FUNCTION__, "kvm_read failed");	\
+		goto bad;						\
+	}								\
+   }
+
+static int
+getifa(char *name, struct in6_ifaddr *ifap)
+{
+	u_short index;
+	kvm_t *kvmd = NULL;
+	char buf[_POSIX2_LINE_MAX];
+	struct ifnet *ifp;
+	struct ifnet ifnet;
+	struct in6_ifaddr *ifa;
+
+	if (!ifap)
+		exit(1);
+
+	index = (u_short)if_nametoindex(name);
+	if (index == 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "if_nametoindex failed for %s",
+		       name);
+		goto bad;
+	}
+	if ((kvmd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, buf)) == NULL) {
+		warnmsg(LOG_ERR, __FUNCTION__, "kvm_openfiles failed");
+		goto bad;
+	}
+	if (kvm_nlist(kvmd, nl) < 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "kvm_nlist failed");
+		goto bad;
+	}
+	if (nl[N_IFNET].n_value == 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "symbol \"%s\" not found",
+		       nl[N_IFNET].n_name);
+		goto bad;
+	}
+
+	KREAD(nl[N_IFNET].n_value, &ifp, struct ifnet *);
+	while (ifp) {
+		KREAD(ifp, &ifnet, struct ifnet);
+		if (ifnet.if_index == index)
+			break;
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+		ifp = TAILQ_NEXT(&ifnet, if_list);
+#elif defined(__FreeBSD__) && __FreeBSD__ >= 3
+		ifp = TAILQ_NEXT(&ifnet, if_link);
+#else
+		ifp = ifnet.if_next;
+#endif
+	}
+	if (!ifp) {
+		warnmsg(LOG_ERR, __FUNCTION__, "interface \"%s\" not found",
+		       name);
+		goto bad;
+	}
+
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+	ifa = (struct in6_ifaddr *)TAILQ_FIRST(&ifnet.if_addrlist);
+#elif defined(__FreeBSD__) && __FreeBSD__ >= 3
+	ifa = (struct in6_ifaddr *)TAILQ_FIRST(&ifnet.if_addrhead);
+#else
+	ifa = (struct in6_ifaddr *)ifnet.if_addrlist;
+#endif
+	while (ifa) {
+		KREAD(ifa, ifap, *ifap);
+		if (ifap->ia_addr.sin6_family == AF_INET6
+		 && IN6_IS_ADDR_LINKLOCAL(&ifap->ia_addr.sin6_addr)) {
+			kvm_close(kvmd);
+			return 0;
+		}
+
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+		ifa = (struct in6_ifaddr *)
+			TAILQ_NEXT((struct ifaddr *)ifap, ifa_list);
+#elif defined(__FreeBSD__) && __FreeBSD__ >= 3
+		ifa = (struct in6_ifaddr *)
+			TAILQ_NEXT((struct ifaddr *)ifap, ifa_link);
+#else
+		ifa = (struct in6_ifaddr *)(((struct ifaddr *)ifap)->ifa_next);
+#endif
+	}
+	warnmsg(LOG_ERR, __FUNCTION__, "no IPv6 link-local address for %s",
+	       name);
+
+  bad:
+	if (kvmd)
+		kvm_close(kvmd);
+	return -1;
+}
+
+static void
+get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
+{
+	int i;
+
+	for (i = 0; i < RTAX_MAX; i++) {
+		if (addrs & (1 << i)) {
+			rti_info[i] = sa;
+			NEXT_SA(sa);
+		}
+		else
+			rti_info[i] = NULL;
+	}
+}
diff --git a/usr.sbin/rtsold/probe.c b/usr.sbin/rtsold/probe.c
new file mode 100644
index 0000000..4b42c21
--- /dev/null
+++ b/usr.sbin/rtsold/probe.c
@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 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/types.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+
+#include <net/if.h>
+#if defined(__FreeBSD__) && __FreeBSD__ >= 3
+#include <net/if_var.h>
+#endif /* __FreeBSD__ >= 3 */
+
+#include <netinet/in.h>
+#include <netinet6/in6_var.h>
+#include <netinet/icmp6.h>
+#include <netinet6/nd6.h>
+
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <syslog.h>
+
+#include "rtsold.h"
+
+static struct msghdr sndmhdr;
+static struct iovec sndiov[2];
+static int probesock;
+static void sendprobe __P((struct in6_addr *addr, int ifindex));
+
+int
+probe_init()
+{
+	static u_char sndcmsgbuf[CMSG_SPACE(sizeof(struct in6_pktinfo)) +
+				CMSG_SPACE(sizeof(int))];
+
+	if ((probesock = socket(AF_INET6, SOCK_RAW, IPPROTO_NONE)) < 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "socket: %s", strerror(errno));
+		return(-1);
+	}
+
+	/* make the socket send-only */
+	if (shutdown(probesock, 0)) {
+		warnmsg(LOG_ERR, __FUNCTION__, "shutdown: %s", strerror(errno));
+		return(-1);
+	}
+
+	/* initialize msghdr for sending packets */
+	sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
+	sndmhdr.msg_iov = sndiov;
+	sndmhdr.msg_iovlen = 1;
+	sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
+	sndmhdr.msg_controllen = sizeof(sndcmsgbuf);
+
+	return(0);
+}
+
+/*
+ * Probe if each router in the default router list is still alive.
+ */
+void
+defrouter_probe(int ifindex)
+{
+	struct in6_drlist dr;
+	int s, i;
+	u_char ntopbuf[INET6_ADDRSTRLEN];
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "socket: %s", strerror(errno));
+		return;
+	}
+	bzero(&dr, sizeof(dr));
+	strcpy(dr.ifname, "lo0"); /* dummy interface */
+	if (ioctl(s, SIOCGDRLST_IN6, (caddr_t)&dr) < 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGDRLST_IN6): %s",
+		       strerror(errno));
+		goto closeandend;
+	}
+
+	for(i = 0; dr.defrouter[i].if_index && i < PRLSTSIZ; i++) {
+		if (ifindex && dr.defrouter[i].if_index == ifindex) {
+			/* sanity check */
+			if (!IN6_IS_ADDR_LINKLOCAL(&dr.defrouter[i].rtaddr)) {
+				warnmsg(LOG_ERR, __FUNCTION__,
+					"default router list contains a "
+					"non-linklocal address(%s)",
+				       inet_ntop(AF_INET6,
+						 &dr.defrouter[i].rtaddr,
+						 ntopbuf, INET6_ADDRSTRLEN));
+				continue; /* ignore the address */
+			}
+			sendprobe(&dr.defrouter[i].rtaddr,
+				  dr.defrouter[i].if_index);
+		}
+	}
+
+  closeandend:
+	close(s);
+	return;
+}
+
+static void
+sendprobe(struct in6_addr *addr, int ifindex)
+{
+	struct sockaddr_in6 sa6_probe;
+	struct in6_pktinfo *pi;
+	struct cmsghdr *cm;
+	u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];;
+
+	bzero(&sa6_probe, sizeof(sa6_probe));
+	sa6_probe.sin6_family = AF_INET6;
+	sa6_probe.sin6_len = sizeof(sa6_probe);
+	sa6_probe.sin6_addr = *addr;
+
+	sndmhdr.msg_name = (caddr_t)&sa6_probe;
+	sndmhdr.msg_iov[0].iov_base = NULL;
+	sndmhdr.msg_iov[0].iov_len = 0;
+
+	cm = CMSG_FIRSTHDR(&sndmhdr);
+	/* specify the outgoing interface */
+	cm->cmsg_level = IPPROTO_IPV6;
+	cm->cmsg_type = IPV6_PKTINFO;
+	cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
+	pi = (struct in6_pktinfo *)CMSG_DATA(cm);
+	memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr));	/*XXX*/
+	pi->ipi6_ifindex = ifindex;
+
+	/* specify the hop limit of the packet for safety */
+	{
+		int hoplimit = 1;
+
+		cm = CMSG_NXTHDR(&sndmhdr, cm);
+		cm->cmsg_level = IPPROTO_IPV6;
+		cm->cmsg_type = IPV6_HOPLIMIT;
+		cm->cmsg_len = CMSG_LEN(sizeof(int));
+		memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
+	}
+
+	warnmsg(LOG_DEBUG, __FUNCTION__, "probe a router %s on %s",
+	       inet_ntop(AF_INET6, addr, ntopbuf, INET6_ADDRSTRLEN),
+	       if_indextoname(ifindex, ifnamebuf));
+
+	if (sendmsg(probesock, &sndmhdr, 0))
+		warnmsg(LOG_ERR, __FUNCTION__, "sendmsg on %s: %s",
+			if_indextoname(ifindex, ifnamebuf), strerror(errno));
+
+	return;
+}
diff --git a/usr.sbin/rtsold/rtsol.c b/usr.sbin/rtsold/rtsol.c
new file mode 100644
index 0000000..5b76403
--- /dev/null
+++ b/usr.sbin/rtsold/rtsol.c
@@ -0,0 +1,312 @@
+/*
+ * 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/socket.h>
+#include <sys/uio.h>
+#include <sys/time.h>
+
+#include <net/if.h>
+#include <net/route.h>
+#include <net/if_dl.h>
+
+#include <netinet/in.h>
+#include <netinet/ip6.h>
+#include <netinet6/ip6_var.h>
+#include <netinet/icmp6.h>
+
+#include <arpa/inet.h>
+
+#include <time.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <err.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include "rtsold.h"
+
+#define	ALLROUTER "ff02::2"
+
+static struct msghdr rcvmhdr;
+static struct msghdr sndmhdr;
+static struct iovec rcviov[2];
+static struct iovec sndiov[2];
+static struct sockaddr_in6 from;
+
+static int rssock;
+
+static struct sockaddr_in6 sin6_allrouters = {sizeof(sin6_allrouters), AF_INET6};
+
+int
+sockopen()
+{
+	int on;
+	struct icmp6_filter filt;
+	static u_char answer[1500];
+	static u_char rcvcmsgbuf[CMSG_SPACE(sizeof(struct in6_pktinfo)) +
+				CMSG_SPACE(sizeof(int))];
+	static u_char sndcmsgbuf[CMSG_SPACE(sizeof(struct in6_pktinfo)) +
+				CMSG_SPACE(sizeof(int))];
+
+	memset(&sin6_allrouters, 0, sizeof(struct sockaddr_in6));
+	if (inet_pton(AF_INET6, ALLROUTER,
+		      &sin6_allrouters.sin6_addr.s6_addr) != 1) {
+		warnmsg(LOG_ERR, __FUNCTION__, "inet_pton failed for %s",
+		       ALLROUTER);
+		return(-1);
+	}
+
+	if ((rssock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "socket: %s", strerror(errno));
+		return(-1);
+	}
+
+	/* specify to tell receiving interface */
+	on = 1;
+	if (setsockopt(rssock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
+		       sizeof(on)) < 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "IPV6_PKTINFO: %s",
+		       strerror(errno));
+		exit(1);
+	}
+
+	on = 1;
+	/* specify to tell value of hoplimit field of received IP6 hdr */
+	if (setsockopt(rssock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
+		       sizeof(on)) < 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "IPV6_HOPLIMIT: %s",
+		       strerror(errno));
+		exit(1);
+	}
+
+	/* specfiy to accept only router advertisements on the socket */
+	ICMP6_FILTER_SETBLOCKALL(&filt);
+	ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
+	if (setsockopt(rssock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
+		       sizeof(filt)) == -1) {
+		warnmsg(LOG_ERR, __FUNCTION__, "setsockopt(ICMP6_FILTER): %s",
+		       strerror(errno));
+		return(-1);
+	}
+
+	/* initialize msghdr for receiving packets */
+	rcviov[0].iov_base = (caddr_t)answer;
+	rcviov[0].iov_len = sizeof(answer);
+	rcvmhdr.msg_name = (caddr_t)&from;
+	rcvmhdr.msg_namelen = sizeof(from);
+	rcvmhdr.msg_iov = rcviov;
+	rcvmhdr.msg_iovlen = 1;
+	rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
+	rcvmhdr.msg_controllen = sizeof(rcvcmsgbuf);
+
+	/* initialize msghdr for sending packets */
+	sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
+	sndmhdr.msg_iov = sndiov;
+	sndmhdr.msg_iovlen = 1;
+	sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
+	sndmhdr.msg_controllen = sizeof(sndcmsgbuf);
+
+	return(rssock);
+}
+
+void
+sendpacket(struct ifinfo *ifinfo)
+{
+	int i;
+	struct cmsghdr *cm;
+	struct in6_pktinfo *pi;
+
+	sndmhdr.msg_name = (caddr_t)&sin6_allrouters;
+	sndmhdr.msg_iov[0].iov_base = (caddr_t)ifinfo->rs_data;
+	sndmhdr.msg_iov[0].iov_len = ifinfo->rs_datalen;
+
+	cm = CMSG_FIRSTHDR(&sndmhdr);
+	/* specify the outgoing interface */
+	cm->cmsg_level = IPPROTO_IPV6;
+	cm->cmsg_type = IPV6_PKTINFO;
+	cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
+	pi = (struct in6_pktinfo *)CMSG_DATA(cm);
+	memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr));	/*XXX*/
+	pi->ipi6_ifindex = ifinfo->sdl->sdl_index;
+
+	/* specify the hop limit of the packet */
+	{
+		int hoplimit = 255;
+
+		cm = CMSG_NXTHDR(&sndmhdr, cm);
+		cm->cmsg_level = IPPROTO_IPV6;
+		cm->cmsg_type = IPV6_HOPLIMIT;
+		cm->cmsg_len = CMSG_LEN(sizeof(int));
+		memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
+	}
+
+	warnmsg(LOG_DEBUG,
+	       __FUNCTION__, "send RS on %s, whose state is %d",
+	       ifinfo->ifname, ifinfo->state);
+
+	i = sendmsg(rssock, &sndmhdr, 0);
+
+	if (i < 0 || i != ifinfo->rs_datalen) {
+		/*
+		 * ENETDOWN is not so serious, especially when using several
+		 * network cards on a mobile node. We ignore it.
+		 */
+		if (errno != ENETDOWN || dflag > 0)
+			warnmsg(LOG_ERR, __FUNCTION__, "sendmsg on %s: %s",
+				ifinfo->ifname, strerror(errno));
+	}
+
+	/* update counter */
+	ifinfo->probes++;
+}
+
+void
+rtsol_input(int s)
+{
+	int i;
+	int *hlimp = NULL;
+	struct icmp6_hdr *icp;
+	int ifindex = 0;
+	struct cmsghdr *cm;
+	struct in6_pktinfo *pi = NULL;
+	struct ifinfo *ifi = NULL;
+	u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
+
+	/* get message */
+	if ((i = recvmsg(s, &rcvmhdr, 0)) < 0) {
+		warnmsg(LOG_ERR, __FUNCTION__, "recvmsg: %s", strerror(errno));
+		return;
+	}
+
+	/* extract optional information via Advanced API */
+	for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr);
+	     cm;
+	     cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
+		if (cm->cmsg_level == IPPROTO_IPV6 &&
+		    cm->cmsg_type == IPV6_PKTINFO &&
+		    cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
+			pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
+			ifindex = pi->ipi6_ifindex;
+		}
+		if (cm->cmsg_level == IPPROTO_IPV6 &&
+		    cm->cmsg_type == IPV6_HOPLIMIT &&
+		    cm->cmsg_len == CMSG_LEN(sizeof(int)))
+			hlimp = (int *)CMSG_DATA(cm);
+	}
+
+	if (ifindex == 0) {
+		warnmsg(LOG_ERR,
+		       __FUNCTION__, "failed to get receiving interface");
+		return;
+	}
+	if (hlimp == NULL) {
+		warnmsg(LOG_ERR,
+		       __FUNCTION__, "failed to get receiving hop limit");
+		return;
+	}
+
+	if (i < sizeof(struct nd_router_advert)) {
+		warnmsg(LOG_ERR,
+		       __FUNCTION__, "packet size(%d) is too short", i);
+		return;
+	}
+
+	icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
+
+	if (icp->icmp6_type != ND_ROUTER_ADVERT) {
+		warnmsg(LOG_ERR, __FUNCTION__,
+			"invalid icmp type(%d) from %s on %s", icp->icmp6_type,
+		       inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
+				 INET6_ADDRSTRLEN),
+		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+		return;
+	}
+
+	if (icp->icmp6_code != 0) {
+		warnmsg(LOG_ERR, __FUNCTION__,
+			"invalid icmp code(%d) from %s on %s", icp->icmp6_code,
+		       inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
+				 INET6_ADDRSTRLEN),
+		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+		return;
+	}
+
+	if (*hlimp != 255) {
+		warnmsg(LOG_NOTICE, __FUNCTION__,
+			"invalid RA with hop limit(%d) from %s on %s",
+		       *hlimp,
+		       inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
+				 INET6_ADDRSTRLEN),
+		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+		return;
+	}
+
+	if (pi && !IN6_IS_ADDR_LINKLOCAL(&from.sin6_addr)) {
+		warnmsg(LOG_NOTICE, __FUNCTION__,
+			"invalid RA with non link-local source from %s on %s",
+		       inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
+				 INET6_ADDRSTRLEN),
+		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+		return;
+	}
+
+	/* xxx: more validation? */
+
+	if ((ifi = find_ifinfo(pi->ipi6_ifindex)) == NULL) {
+		warnmsg(LOG_NOTICE, __FUNCTION__,
+			"received RA from %s on an unexpeced IF(%s)",
+		       inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
+				 INET6_ADDRSTRLEN),
+		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+		return;
+	}
+
+	warnmsg(LOG_DEBUG, __FUNCTION__,
+		"received RA from %s on %s, state is %d",
+	       inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
+			 INET6_ADDRSTRLEN),
+	       ifi->ifname, ifi->state);
+
+	ifi->racnt++;
+
+	switch(ifi->state) {
+	 case IFS_IDLE:		/* should be ignored */
+	 case IFS_DELAY:		/* right? */
+		 break;
+	 case IFS_PROBE:
+		 ifi->state = IFS_IDLE;
+		 ifi->probes = 0;
+		 rtsol_timer_update(ifi);
+		 break;
+	}
+}
diff --git a/usr.sbin/rtsold/rtsold.8 b/usr.sbin/rtsold/rtsold.8
new file mode 100644
index 0000000..90d483a
--- /dev/null
+++ b/usr.sbin/rtsold/rtsold.8
@@ -0,0 +1,175 @@
+.\" 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.
+.\"
+.\"     $Id: rtsold.8,v 1.4 1999/09/30 00:57:15 jinmei Exp $
+.\"	$FreeBSD$
+.\"
+.Dd May 17, 1998
+.Dt RTSOLD 8
+.Os KAME
+.\"
+.Sh NAME
+.Nm rtsold
+.Nd router solicitation daemon
+.\"
+.Sh SYNOPSIS
+.Nm
+.Op Fl dDfm1
+.Ar interface ...
+.Nm rtsol
+.Op Fl dD
+.Ar interface ...
+.\"
+.Sh DESCRIPTION
+.Nm Rtsold
+is the daemon program to send ICMPv6 Router Solicitation messages
+on the specified interfaces.
+If a node (re)attaches to a link,
+.Nm
+sends some Router Solicitations on the link destined to the link-local scope
+all-routers multicast address to discover new routers
+and to get non link-local addresses.
+.Lp
+Specifically,
+.Nm
+sends at most 3 Router Solicitations on an interface
+after one of the following events:
+.Bl -bullet -compact
+.It
+Just after invocation of
+.Nm
+daemon.
+.It
+The interface is up after a temporary interface failure.
+.Nm Rtsold
+detects it by periodically probing if the status of the
+interface is active or not.
+Note that some network cards and drivers do not allow users
+to extract link state.
+In such cases,
+.Nm
+cannot detect the change of the interface status.
+.It
+Every one minute if
+.Fl m
+option is specified and
+.Nm
+daemon cannot get the interface status.
+This feature does not conform to IPv6 neighbor discovery
+specification, but is provided for mobile stations.
+Default interval of router advertisements, which is on the order of 10
+minutes, is slightly long for mobile stations.
+This feature is provided
+for such stations so that they can find new routers as soon as possible
+when they attach another link.
+.El
+.Lp
+Once
+.Nm
+sends a Router Solicitation, and receives a valid Router Advertisement,
+it desists from sending additional solicitations on that interface, until
+the next time one of the above events occurs.
+.Lp
+When sending a Router Solicitation on an interface,
+.Nm
+includes a Source Link-layer address option if the interface
+has its link-layer address.
+.Pp
+Upon receipt of signal
+.Dv SIGUSR1 ,
+.Nm
+will dump the current internal state into
+.Pa /var/tmp/rtsold.dump.
+.\"
+.Sh OPTIONS
+.Bl -tag -width indent
+.\"
+.It Fl d
+Enable debugging.
+.It Fl D
+Enable more debugging including to print internal timer information.
+.It Fl f
+.Fl f
+prevents
+.Nm
+from becoming a daemon (foreground mode).
+Warning messages are generated to standard error output,
+instead of
+.Xr syslog 3 .
+.It Fl m
+Enable mobility support.
+If this option is specified,
+.Nm
+sends probing packets to default routers that have advertised Router
+Advertisements
+when the node (re)attaches to an interface.
+Moreover, if the option is specified,
+.Nm
+periodically sends Router Solicitation on an interface that does not support
+.Dv SIOCGIFMEDIA
+ioctl.
+.It Fl 1
+Perform only one probe.
+Transmit Router Solcitation packet until valid Router Advertisement packet
+arrives all the interfaces more than once, then exit.
+.El
+.Pp
+If you invoke the program as
+.Nm rtsol ,
+it will behave as
+.Do
+.Nm
+.Fl f1
+.Ar interfaces
+.Dc .
+.Sh RETURN VALUES
+The program exits with 0 on success, non-zero on failures.
+.\"
+.Sh FILES
+.Bl -tag -width /var/run/rtsold.dump -compact
+.It Pa /var/run/rtsold.pid
+the pid of the currently running
+.Nm rtsold .
+.It Pa /var/tmp/rtsold.dump
+dumps internal state on.
+.El
+.\"
+.Sh SEE ALSO
+.Xr rtadvd 8 ,
+.Xr sysctl 8
+.\"
+.Sh HISTORY
+The
+.Nm
+command is based on
+.Nm rtsol
+command, which first appeared in WIDE/KAME IPv6 protocol stack kit.
+.Nm rtsol
+is now integrated into
+.Xr rtsold 8 .
+.\" .Sh BUGS
+.\" (to be written)
diff --git a/usr.sbin/rtsold/rtsold.c b/usr.sbin/rtsold/rtsold.c
new file mode 100644
index 0000000..8d5646f
--- /dev/null
+++ b/usr.sbin/rtsold/rtsold.c
@@ -0,0 +1,622 @@
+/*
+ * 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/types.h>
+#include <sys/time.h>
+
+#include <net/if_dl.h>
+
+#include <netinet/in.h>
+#include <netinet/icmp6.h>
+
+#include <signal.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <err.h>
+#include <stdarg.h>
+#include "rtsold.h"
+
+struct ifinfo *iflist;
+struct timeval tm_max =	{0x7fffffff, 0x7fffffff};
+int dflag;
+static int log_upto = 999;
+static int fflag = 0;
+
+/* protocol constatns */
+#define	MAX_RTR_SOLICITATION_DELAY	1 /* second */
+#define	RTR_SOLICITATION_INTERVAL	4 /* seconds */
+#define	MAX_RTR_SOLICITATIONS		3 /* times */
+
+/* implementation dependent constants */
+#define	PROBE_INTERVAL 60	/* secondes XXX: should be configurable */
+
+/* utility macros */
+/* a < b */
+#define	TIMEVAL_LT(a, b) (((a).tv_sec < (b).tv_sec) ||\
+			  (((a).tv_sec == (b).tv_sec) && \
+			    ((a).tv_usec < (b).tv_usec)))
+
+/* a <= b */
+#define	TIMEVAL_LEQ(a, b) (((a).tv_sec < (b).tv_sec) ||\
+			   (((a).tv_sec == (b).tv_sec) &&\
+ 			    ((a).tv_usec <= (b).tv_usec)))
+
+/* a == b */
+#define	TIMEVAL_EQ(a, b) (((a).tv_sec==(b).tv_sec) && ((a).tv_usec==(b).tv_usec))
+
+int main __P((int argc, char *argv[]));
+
+/* static variables and functions */
+static int mobile_node = 0;
+static int do_dump;
+static char *dumpfilename = "/var/tmp/rtsold.dump"; /* XXX: should be configurable */
+static char *pidfilename = "/var/run/rtsold.pid"; /* should be configurable */
+
+static int ifconfig __P((char *ifname));
+static int make_packet __P((struct ifinfo *ifinfo));
+static struct timeval *rtsol_check_timer __P((void));
+static void TIMEVAL_ADD __P((struct timeval *a, struct timeval *b,
+			     struct timeval *result));
+static void TIMEVAL_SUB __P((struct timeval *a, struct timeval *b,
+			     struct timeval *result));
+
+static void rtsold_set_dump_file __P(());
+static void usage __P((char *progname));
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	int s, ch;
+	int once = 0;
+	struct timeval *timeout;
+	struct fd_set fdset;
+	char *argv0;
+	char *opts;
+
+	/*
+	 * Initialization
+	 */
+	argv0 = argv[0];
+
+	/* get option */
+	if (argv0 && argv0[strlen(argv0) - 1] != 'd') {
+		fflag = 1;
+		once = 1;
+		opts = "dD";
+	} else
+		opts = "dDfm1";
+
+	while ((ch = getopt(argc, argv, opts)) != -1) {
+		switch(ch) {
+		 case 'd':
+			 dflag = 1;
+			 break;
+		 case 'D':
+			 dflag = 2;
+			 break;
+		 case 'f':
+			 fflag = 1;
+			 break;
+		 case 'm':
+			 mobile_node = 1;
+			 break;
+		 case '1':
+			 once = 1;
+			 break;
+		 default:
+			 usage(argv0);
+		}
+	}
+	argc -= optind;
+	argv += optind;
+	if (argc == 0)
+		usage(argv0);
+
+	/* set log level */
+	if (dflag == 0)
+		log_upto = LOG_NOTICE;
+	if (!fflag) {
+		char *ident;
+		ident = strrchr(argv0, '/');
+		if (!ident)
+			ident = argv0;
+		else
+			ident++;
+		openlog(ident, LOG_NDELAY|LOG_PID, LOG_DAEMON);
+		if (log_upto >= 0)
+			setlogmask(LOG_UPTO(log_upto));
+	}
+
+	/* random value initilization */
+	srandom((u_long)time(NULL));
+
+	/* warn if accept_rtadv is down */
+	if (!getinet6sysctl(IPV6CTL_ACCEPT_RTADV))
+		warnx("kernel is configured not to accept RAs");
+
+	/* initialization to dump internal status to a file */
+	if (signal(SIGUSR1, (void *)rtsold_set_dump_file) < 0)
+		errx(1, "failed to set signal for dump status");
+
+	/* configuration per interface */
+	if (ifinit())
+		errx(1, "failed to initilizatoin interfaces");
+	while (argc--) {
+		if (ifconfig(*argv))
+			errx(1, "failed to initilize %s", *argv);
+		argv++;
+	}
+
+	/* open a socket for sending RS and receiving RA */
+	if ((s = sockopen()) < 0)
+		errx(1, "failed to open a socket");
+
+	/* setup for probing default routers */
+	if (probe_init())
+		errx(1, "failed to setup for probing routers");
+
+	if (!fflag)
+		daemon(0, 0);		/* act as a daemon */
+
+	/* dump the current pid */
+	if (!once) {
+		pid_t pid = getpid();
+		FILE *fp;
+
+		if ((fp = fopen(pidfilename, "w")) == NULL)
+			warnmsg(LOG_ERR, __FUNCTION__,
+				"failed to open a log file(%s)",
+				pidfilename, strerror(errno));
+		else {
+			fprintf(fp, "%d\n", pid);
+			fclose(fp);
+		}
+	}
+
+	FD_ZERO(&fdset);
+	FD_SET(s, &fdset);
+	while (1) {		/* main loop */
+		extern int errno;
+		int e;
+		struct fd_set select_fd = fdset;
+
+		if (do_dump) {	/* SIGUSR1 */
+			do_dump = 0;
+			rtsold_dump_file(dumpfilename);
+		}
+
+		timeout = rtsol_check_timer();
+
+		if (once) {
+			struct ifinfo *ifi;
+
+			/* if we have no timeout, we are done (or failed) */
+			if (timeout == NULL)
+				break;
+
+			/* if all interfaces have got RA packet, we are done */
+			for (ifi = iflist; ifi; ifi = ifi->next) {
+				if (ifi->state != IFS_DOWN && ifi->racnt == 0)
+					break;
+			}
+			if (ifi == NULL)
+				break;
+		}
+
+		if ((e = select(s + 1, &select_fd, NULL, NULL, timeout)) < 1) {
+			if (e < 0 && errno != EINTR) {
+				warnmsg(LOG_ERR, __FUNCTION__, "select: %s",
+				       strerror(errno));
+			}
+			continue;
+		}
+
+		/* packet reception */
+		if (FD_ISSET(s, &fdset))
+			rtsol_input(s);
+	}
+	/* NOTREACHED */
+
+	return 0;
+}
+
+static int
+ifconfig(char *ifname)
+{
+	struct ifinfo *ifinfo;
+	struct sockaddr_dl *sdl;
+	int flags;
+
+	if ((sdl = if_nametosdl(ifname)) == NULL) {
+		warnmsg(LOG_ERR, __FUNCTION__,
+		       "failed to get link layer information for %s", ifname);
+		return(-1);
+	}
+	if (find_ifinfo(sdl->sdl_index)) {
+		warnmsg(LOG_ERR, __FUNCTION__,
+			"interface %s was already cofigured", ifname);
+		return(-1);
+	}
+
+	if ((ifinfo = malloc(sizeof(*ifinfo))) == NULL) {
+		warnmsg(LOG_ERR, __FUNCTION__, "memory allocation failed");
+		return(-1);
+	}
+	memset(ifinfo, 0, sizeof(*ifinfo));
+	ifinfo->sdl = sdl;
+
+	strncpy(ifinfo->ifname, ifname, sizeof(ifinfo->ifname));
+
+	/* construct a router solicitation message */
+	if (make_packet(ifinfo))
+		goto bad;
+
+	/*
+	 * check if the interface is available.
+	 * also check if SIOCGIFMEDIA ioctl is OK on the interface.
+	 */
+	ifinfo->mediareqok = 1;
+	ifinfo->active = interface_status(ifinfo);
+	if (!ifinfo->mediareqok) {
+		/*
+		 * probe routers periodically even if the link status
+		 * does not change.
+		 */
+		ifinfo->probeinterval = PROBE_INTERVAL;
+	}
+
+	/* activate interface: interface_up returns 0 on success */
+	flags = interface_up(ifinfo->ifname);
+	if (flags == 0)
+		ifinfo->state = IFS_DELAY;
+	else if (flags == IFS_TENTATIVE)
+		ifinfo->state = IFS_TENTATIVE;
+	else
+		ifinfo->state = IFS_DOWN;
+
+	rtsol_timer_update(ifinfo);
+
+	/* link into chain */
+	if (iflist)
+		ifinfo->next = iflist;
+	iflist = ifinfo;
+
+	return(0);
+
+  bad:
+	free(ifinfo);
+	free(ifinfo->sdl);
+	return(-1);
+}
+
+struct ifinfo *
+find_ifinfo(int ifindex)
+{
+	struct ifinfo *ifi;
+
+	for (ifi = iflist; ifi; ifi = ifi->next)
+		if (ifi->sdl->sdl_index == ifindex)
+			return(ifi);
+
+	return(NULL);
+}
+
+static int
+make_packet(struct ifinfo *ifinfo)
+{
+	char *buf;
+	struct nd_router_solicit *rs;
+	size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
+
+	if ((lladdroptlen = lladdropt_length(ifinfo->sdl)) == 0) {
+		warnmsg(LOG_INFO, __FUNCTION__,
+			"link-layer address option has null length"
+		       " on %s. Treat as not included.", ifinfo->ifname);
+	}
+	packlen += lladdroptlen;
+	ifinfo->rs_datalen = packlen;
+
+	/* allocate buffer */
+	if ((buf = malloc(packlen)) == NULL) {
+		warnmsg(LOG_ERR, __FUNCTION__,
+			"memory allocation failed for %s", ifinfo->ifname);
+		return(-1);
+	}
+	ifinfo->rs_data = buf;
+
+	/* fill in the message */
+	rs = (struct nd_router_solicit *)buf;
+	rs->nd_rs_type = ND_ROUTER_SOLICIT;
+	rs->nd_rs_code = 0;
+	rs->nd_rs_cksum = 0;
+	rs->nd_rs_reserved = 0;
+	buf += sizeof(*rs);
+
+	/* fill in source link-layer address option */
+	if (lladdroptlen)
+		lladdropt_fill(ifinfo->sdl, (struct nd_opt_hdr *)buf);
+
+	return(0);
+}
+
+static struct timeval *
+rtsol_check_timer()
+{
+	static struct timeval returnval;
+	struct timeval now, rtsol_timer;
+	struct ifinfo *ifinfo;
+	int flags;
+
+	gettimeofday(&now, NULL);
+
+	rtsol_timer = tm_max;
+
+	for (ifinfo = iflist; ifinfo; ifinfo = ifinfo->next) {
+		if (TIMEVAL_LEQ(ifinfo->expire, now)) {
+			if (dflag > 1)
+				warnmsg(LOG_DEBUG, __FUNCTION__,
+					"timer expiration on %s, "
+				       "state = %d", ifinfo->ifname,
+				       ifinfo->state);
+
+			switch(ifinfo->state) {
+			case IFS_DOWN:
+			case IFS_TENTATIVE:
+				/* interface_up returns 0 on success */
+				flags = interface_up(ifinfo->ifname);
+				if (flags == 0)
+					ifinfo->state = IFS_DELAY;
+				else if (flags == IFS_TENTATIVE)
+					ifinfo->state = IFS_TENTATIVE;
+				else
+					ifinfo->state = IFS_DOWN;
+				break;
+			case IFS_IDLE:
+			{
+				int oldstatus = ifinfo->active;
+				int probe = 0;
+
+				ifinfo->active =
+					interface_status(ifinfo);
+
+				if (oldstatus != ifinfo->active) {
+					warnmsg(LOG_DEBUG, __FUNCTION__,
+						"%s status is changed"
+						" from %d to %d",
+						ifinfo->ifname,
+						oldstatus, ifinfo->active);
+					probe = 1;
+					ifinfo->state = IFS_DELAY;
+				}
+				else if (ifinfo->probeinterval &&
+					 (ifinfo->probetimer -=
+					  ifinfo->timer.tv_sec) <= 0) {
+					/* probe timer expired */
+					ifinfo->probetimer =
+						ifinfo->probeinterval;
+					probe = 1;
+					ifinfo->state = IFS_PROBE;
+				}
+
+				if (probe && mobile_node)
+					defrouter_probe(ifinfo->sdl->sdl_index);
+				break;
+			}
+			case IFS_DELAY:
+				ifinfo->state = IFS_PROBE;
+				sendpacket(ifinfo);
+				break;
+			case IFS_PROBE:
+				if (ifinfo->probes < MAX_RTR_SOLICITATIONS)
+					sendpacket(ifinfo);
+				else {
+					warnmsg(LOG_INFO, __FUNCTION__,
+						"No answer "
+						"after sending %d RSs",
+						ifinfo->probes);
+					ifinfo->probes = 0;
+					ifinfo->state = IFS_IDLE;
+				}
+				break;
+			}
+			rtsol_timer_update(ifinfo);
+		}
+
+		if (TIMEVAL_LT(ifinfo->expire, rtsol_timer))
+			rtsol_timer = ifinfo->expire;
+	}
+
+	if (TIMEVAL_EQ(rtsol_timer, tm_max)) {
+		warnmsg(LOG_DEBUG, __FUNCTION__, "there is no timer");
+		return(NULL);
+	}
+	else if (TIMEVAL_LT(rtsol_timer, now))
+		/* this may occur when the interval is too small */
+		returnval.tv_sec = returnval.tv_usec = 0;
+	else
+		TIMEVAL_SUB(&rtsol_timer, &now, &returnval);
+
+	if (dflag > 1)
+		warnmsg(LOG_DEBUG, __FUNCTION__, "New timer is %d:%08d",
+		       returnval.tv_sec, returnval.tv_usec);
+
+	return(&returnval);
+}
+
+void
+rtsol_timer_update(struct ifinfo *ifinfo)
+{
+#define	MILLION 1000000
+#define	DADRETRY 10		/* XXX: adhoc */
+	long interval;
+	struct timeval now;
+
+	bzero(&ifinfo->timer, sizeof(ifinfo->timer));
+
+	switch (ifinfo->state) {
+	case IFS_DOWN:
+	case IFS_TENTATIVE:
+		if (++ifinfo->dadcount > DADRETRY) {
+			ifinfo->dadcount = 0;
+			ifinfo->timer.tv_sec = PROBE_INTERVAL;
+		}
+		else
+			ifinfo->timer.tv_sec = 1;
+		break;
+	case IFS_IDLE:
+		if (mobile_node) {
+			/* XXX should be configurable */
+			ifinfo->timer.tv_sec = 3;
+		}
+		else
+			ifinfo->timer = tm_max;	/* stop timer(valid?) */
+		break;
+	case IFS_DELAY:
+		interval = random() % (MAX_RTR_SOLICITATION_DELAY * MILLION);
+		ifinfo->timer.tv_sec = interval / MILLION;
+		ifinfo->timer.tv_usec = interval % MILLION;
+		break;
+	case IFS_PROBE:
+		ifinfo->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
+		break;
+	default:
+		warnmsg(LOG_ERR, __FUNCTION__,
+			"illegal interface state(%d) on %s",
+			ifinfo->state, ifinfo->ifname);
+		return;
+	}
+
+	/* reset the timer */
+	if (TIMEVAL_EQ(ifinfo->timer, tm_max)) {
+		ifinfo->expire = tm_max;
+		warnmsg(LOG_DEBUG, __FUNCTION__,
+			"stop timer for %s", ifinfo->ifname);
+	}
+	else {
+		gettimeofday(&now, NULL);
+		TIMEVAL_ADD(&now, &ifinfo->timer, &ifinfo->expire);
+
+		if (dflag > 1)
+			warnmsg(LOG_DEBUG, __FUNCTION__,
+				"set timer for %s to %d:%d", ifinfo->ifname,
+			       (int)ifinfo->timer.tv_sec,
+			       (int)ifinfo->timer.tv_usec);
+	}
+
+#undef MILLION
+}
+
+/* timer related utility functions */
+#define	MILLION 1000000
+
+/* result = a + b */
+static void
+TIMEVAL_ADD(struct timeval *a, struct timeval *b, struct timeval *result)
+{
+	long l;
+
+	if ((l = a->tv_usec + b->tv_usec) < MILLION) {
+		result->tv_usec = l;
+		result->tv_sec = a->tv_sec + b->tv_sec;
+	}
+	else {
+		result->tv_usec = l - MILLION;
+		result->tv_sec = a->tv_sec + b->tv_sec + 1;
+	}
+}
+
+/*
+ * result = a - b
+ * XXX: this function assumes that a >= b.
+ */
+void
+TIMEVAL_SUB(struct timeval *a, struct timeval *b, struct timeval *result)
+{
+	long l;
+
+	if ((l = a->tv_usec - b->tv_usec) >= 0) {
+		result->tv_usec = l;
+		result->tv_sec = a->tv_sec - b->tv_sec;
+	}
+	else {
+		result->tv_usec = MILLION + l;
+		result->tv_sec = a->tv_sec - b->tv_sec - 1;
+	}
+}
+
+static void
+rtsold_set_dump_file()
+{
+	do_dump = 1;
+}
+
+static void
+usage(char *progname)
+{
+	if (progname && progname[strlen(progname) - 1] != 'd')
+		fprintf(stderr, "usage: rtsol [-dD] interfaces\n");
+	else
+		fprintf(stderr, "usage: rtsold [-dDfm1] interfaces\n");
+	exit(1);
+}
+
+void
+#if __STDC__
+warnmsg(int priority, const char *func, const char *msg, ...)
+#else
+warnmsg(priority, func, msg, va_alist)
+	int priority;
+	const char *func;
+	const char *msg;
+	va_dcl
+#endif
+{
+	va_list ap;
+	char buf[BUFSIZ];
+
+	va_start(ap, msg);
+	if (fflag) {
+		if (priority <= log_upto) {
+			(void)vfprintf(stderr, msg, ap);
+			(void)fprintf(stderr, "\n");
+		}
+	} else {
+		snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
+		vsyslog(priority, buf, ap);
+	}
+	va_end(ap);
+}
diff --git a/usr.sbin/rtsold/rtsold.h b/usr.sbin/rtsold/rtsold.h
new file mode 100644
index 0000000..afb5088
--- /dev/null
+++ b/usr.sbin/rtsold/rtsold.h
@@ -0,0 +1,91 @@
+/*
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+struct ifinfo {
+	struct ifinfo *next;	/* pointer to the next interface */
+
+	struct sockaddr_dl *sdl; /* link-layer address */
+	char ifname[16];	/* interface name */
+	int active;		/* interface status */
+	int probeinterval;	/* interval of probe timer(if necessary) */
+	int probetimer;		/* rest of probe timer */
+	int mediareqok;		/* wheter the IF supports SIOCGIFMEDIA */
+	int state;
+	int probes;
+	int dadcount;
+	struct timeval timer;
+	struct timeval expire;
+
+	int racnt;		/* total # of valid RAs it have got */
+
+	size_t rs_datalen;
+	u_char *rs_data;
+};
+
+/* per interface status */
+#define	IFS_IDLE	0
+#define	IFS_DELAY	1
+#define	IFS_PROBE	2
+#define	IFS_DOWN	3
+#define	IFS_TENTATIVE	4
+
+/* rtsold.c */
+extern struct timeval tm_max;
+extern int dflag;
+struct ifinfo *find_ifinfo __P((int ifindex));
+void rtsol_timer_update __P((struct ifinfo *ifinfo));
+#ifdef __STDC__
+extern void warnmsg __P((int, const char *, const char *, ...));
+#else
+extern void warnmsg __P((int, const char *, const char *, va_list));
+#endif
+
+/* if.c */
+extern int ifinit __P((void));
+extern int interface_up __P((char *name));
+extern int interface_status __P((struct ifinfo*));
+extern int lladdropt_length __P((struct sockaddr_dl *sdl));
+extern void lladdropt_fill __P((struct sockaddr_dl *sdl,
+				struct nd_opt_hdr *ndopt));
+extern struct sockaddr_dl *if_nametosdl __P((char *name));
+extern int getinet6sysctl __P((int code));
+
+/* rtsol.c */
+extern int sockopen __P((void));
+extern void sendpacket __P((struct ifinfo *ifinfo));
+extern void rtsol_input __P((int s));
+
+/* probe.c */
+extern int probe_init __P((void));
+extern void defrouter_probe __P((int ifindex));
+
+/* dump.c */
+extern void rtsold_dump_file __P((char *));