- Refactoring the interface list. It now supports dynamically

  added/removed interfaces in a more consistent manner and reloading
  the configuration file.

- Add initial support for control socket.  RA information in the
  daemon can be obtained by rtadvctl(8) instead of SIGUSR1 in a similar
  manner to ifconfig(8).  The information dump has been removed in favor of it.

  (reload the configuration file)
  # rtadvctl reload

  (show RA messages being sent on each interfaces)
  # rtadvctl show
  em0: flags=<UP,CONFIGURED,PERSIST> status=<RA_SEND> mtu 1280
        DefaultLifetime: 30m
        MinAdvInterval/MaxAdvInterval: 3m20s/3m20s
        AdvLinkMTU: <none>, Flags: O, Preference: medium
        ReachableTime: 0s, RetransTimer: 0s, CurHopLimit: 64
        AdvIfPrefixes: yes

  (show RA messages being sent only on em0)
  # rtadvctl show em0

  (rtadvctl -v show provides additional information)
  # rtadvctl -v show em0
  em0: flags=<UP,CONFIGURED,PERSIST> status=<RA_SEND> mtu 1280
        DefaultLifetime: 30m
        MinAdvInterval/MaxAdvInterval: 3m20s/3m20s
        AdvLinkMTU: <none>, Flags: O, Preference: medium
        ReachableTime: 0s, RetransTimer: 0s, CurHopLimit: 64
        AdvIfPrefixes: yes
        Prefixes (1):
          2001:db8:1::/64 (CONFIG, vltime=30d, pltime=7d, flags=LA)
        RDNSS entries:
          2001:db8:1::128 (ltime=2m40s)

  (stop rtadvd)
  # rtadvctl shutdown

  A remaining issue when reloading the configuration file is that
  during that period rtadvd cannot communicate with rtadvctl due to some
  additional RA sending for graceful shutdown.  This will be fixed later.

1 files changed, 833 insertions, 0 deletions

diff --git a/usr.sbin/rtadvctl/rtadvctl.c b/usr.sbin/rtadvctl/rtadvctl.c
new file mode 100644
index 0000000..e5be355
--- /dev/null
+++ b/usr.sbin/rtadvctl/rtadvctl.c
@@ -0,0 +1,833 @@
+/*-
+ * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
+ * 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.
+ *
+ * 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/queue.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/un.h>
+#include <sys/uio.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/if_var.h>
+#include <net/ethernet.h>
+#include <netinet/in.h>
+#include <netinet/ip6.h>
+#include <netinet/icmp6.h>
+#include <netinet6/in6_var.h>
+#include <netinet6/nd6.h>
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <syslog.h>
+#include <err.h>
+
+#include "pathnames.h"
+#include "rtadvd.h"
+#include "if.h"
+#include "timer_subr.h"
+#include "control.h"
+#include "control_client.h"
+
+#define RA_IFSTATUS_INACTIVE	0
+#define RA_IFSTATUS_RA_RECV	1
+#define RA_IFSTATUS_RA_SEND	2
+
+static int vflag = LOG_ERR;
+
+static void	usage(void);
+
+static int	action_propset(char *);
+static int	action_propget(char *, struct ctrl_msg_pl *);
+static int	action_plgeneric(int, char *, char *);
+
+static int	action_enable(int, char **);
+static int	action_disable(int, char **);
+static int	action_reload(int, char **);
+static int	action_echo(int, char **);
+static int	action_version(int, char **);
+static int	action_shutdown(int, char **);
+
+static int	action_show(int, char **);
+static int	action_show_prefix(struct prefix *);
+#ifdef ROUTEINFO
+static int	action_show_rtinfo(struct rtinfo *);
+#endif
+static int	action_show_rdnss(void *);
+static int	action_show_dnssl(void *);
+
+static int	csock_client_open(struct sockinfo *);
+static size_t	dname_labeldec(char *, size_t, const char *);
+static void	mysyslog(int, const char *, ...);
+
+static const char *rtpref_str[] = {
+	"medium",		/* 00 */
+	"high",			/* 01 */
+	"rsv",			/* 10 */
+	"low"			/* 11 */
+};
+
+static struct dispatch_table {
+	const char	*dt_comm;
+	int (*dt_act)(int, char **);
+} dtable[] = {
+	{ "show", action_show },
+	{ "reload", action_reload },
+	{ "shutdown", action_shutdown },
+	{ NULL, NULL },
+	{ "enable", action_enable },
+	{ "disable", action_disable },
+	{ "echo", action_echo },
+	{ "version", action_version },
+	{ NULL, NULL },
+};
+
+static void
+mysyslog(int priority, const char * restrict fmt, ...)
+{
+	va_list ap;
+
+	if (vflag >= priority) {
+		va_start(ap, fmt);
+		vfprintf(stderr, fmt, ap);
+		fprintf(stderr, "\n");
+		va_end(ap);
+	}
+}
+
+static void
+usage(void)
+{
+	int i;
+
+	for (i = 0; (size_t)i < sizeof(dtable)/sizeof(dtable[0]); i++) {
+		if (dtable[i].dt_comm == NULL)
+			break;
+		printf("%s\n", dtable[i].dt_comm);
+	}
+
+	exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int i;
+	int ch;
+	int (*action)(int, char **) = NULL;
+	int error;
+
+	while ((ch = getopt(argc, argv, "Dv")) != -1) {
+		switch (ch) {
+		case 'D':
+			vflag = LOG_DEBUG;
+			break;
+		case 'v':
+			vflag++;
+			break;
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argc == 0)
+		usage();
+
+	for (i = 0; (size_t)i < sizeof(dtable)/sizeof(dtable[0]); i++) {
+		if (dtable[i].dt_comm == NULL ||
+		    strcmp(dtable[i].dt_comm, argv[0]) == 0) {
+			action = dtable[i].dt_act;
+			break;
+		}
+	}
+
+	if (action != NULL) {
+		error = (dtable[i].dt_act)(--argc, ++argv);
+		if (error)
+			fprintf(stderr, "%s failed.\n", dtable[i].dt_comm);
+	} else
+		usage();
+
+	return (error);
+}
+
+static int
+csock_client_open(struct sockinfo *s)
+{
+	struct sockaddr_un sun;
+
+	if ((s->si_fd = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
+		err(1, "cannot open control socket.");
+
+	memset(&sun, 0, sizeof(sun));
+	sun.sun_family = AF_UNIX;
+	sun.sun_len = sizeof(sun);
+	strlcpy(sun.sun_path, s->si_name, sizeof(sun.sun_path));
+
+	if (connect(s->si_fd, (struct sockaddr *)&sun, sizeof(sun)) == -1)
+		err(1, "connect: %s", s->si_name);
+
+	mysyslog(LOG_DEBUG,
+	    "<%s> connected to %s", __func__, sun.sun_path);
+
+	return (0);
+}
+
+static int
+action_plgeneric(int action, char *plstr, char *buf)
+{
+	struct ctrl_msg_hdr *cm;
+	struct ctrl_msg_pl cp;
+	struct sockinfo *s;
+	char *msg;
+	char *p;
+	char *q;
+
+	s = &ctrlsock;
+	csock_client_open(s);
+
+	cm = (struct ctrl_msg_hdr *)buf;
+	msg = (char *)buf + sizeof(*cm);
+
+	cm->cm_version = CM_VERSION;
+	cm->cm_type = action;
+	cm->cm_len = sizeof(*cm);
+
+	if (plstr != NULL) {
+		memset(&cp, 0, sizeof(cp));
+		p = strchr(plstr, ':');
+		q = strchr(plstr, '=');
+		if (p != NULL && q != NULL && p > q)
+			return (1);
+
+		if (p == NULL) {		/* No : */
+			cp.cp_ifname = NULL;
+			cp.cp_key = plstr;
+		} else if  (p == plstr) {	/* empty */
+			cp.cp_ifname = NULL;
+			cp.cp_key = plstr + 1;
+		} else {
+			*p++ = '\0';
+			cp.cp_ifname = plstr;
+			cp.cp_key = p;
+		}
+		if (q == NULL)
+			cp.cp_val = NULL;
+		else {
+			*q++ = '\0';
+			cp.cp_val = q;
+		}
+		cm->cm_len += cmsg_pl2bin(msg, &cp);
+
+		mysyslog(LOG_DEBUG, "<%s> key=%s, val_len=%d, ifname=%s",
+		    __func__,cp.cp_key, cp.cp_val_len, cp.cp_ifname);
+	}
+
+	return (cmsg_handler_client(s->si_fd, CM_STATE_MSG_DISPATCH, buf));
+}
+
+static int
+action_propget(char *argv, struct ctrl_msg_pl *cp)
+{
+	int error;
+	struct ctrl_msg_hdr *cm;
+	char buf[CM_MSG_MAXLEN];
+	char *msg;
+
+	memset(cp, 0, sizeof(*cp));
+	cm = (struct ctrl_msg_hdr *)buf;
+	msg = (char *)buf + sizeof(*cm);
+
+	error = action_plgeneric(CM_TYPE_REQ_GET_PROP, argv, buf);
+	if (error || cm->cm_len <= sizeof(*cm))
+		return (1);
+
+	cmsg_bin2pl(msg, cp);
+	mysyslog(LOG_DEBUG, "<%s> type=%d, len=%d",
+	    __func__, cm->cm_type, cm->cm_len);
+	mysyslog(LOG_DEBUG, "<%s> key=%s, val_len=%d, ifname=%s",
+	    __func__,cp->cp_key, cp->cp_val_len, cp->cp_ifname);
+
+	return (0);
+}
+
+static int
+action_propset(char *argv)
+{
+	char buf[CM_MSG_MAXLEN];
+
+	return (action_plgeneric(CM_TYPE_REQ_SET_PROP, argv, buf));
+}
+
+/* XXX */
+static int
+action_enable(int argc, char **argv)
+{
+	argc = argc;
+	argv = argv;
+
+	return (0);
+}
+
+/* XXX */
+static int
+action_disable(int argc, char **argv)
+{
+	argc = argc;
+	argv = argv;
+
+	return (0);
+}
+
+static int
+action_reload(int argc __unused, char **argv __unused)
+{
+	char *action_argv;
+
+	action_argv = strdup("reload");
+	return(action_propset(action_argv));
+}
+
+static int
+action_echo(int argc __unused, char **argv __unused)
+{
+	char *action_argv;
+
+	action_argv = strdup("echo");
+	return(action_propset(action_argv));
+}
+
+static int
+action_shutdown(int argc __unused, char **argv __unused)
+{
+	char *action_argv;
+
+	action_argv = strdup("shutdown");
+	return(action_propset(action_argv));
+}
+
+/* XXX */
+static int
+action_version(int argc __unused, char **argv __unused)
+{
+	char *action_argv;
+	struct ctrl_msg_pl cp;
+	int error;
+
+	action_argv = strdup(":version=");
+	error = action_propget(action_argv, &cp);
+	if (error)
+		return (error);
+
+	printf("version=%s\n", cp.cp_val);
+	return (0);
+}
+
+static int
+action_show(int argc, char **argv)
+{
+	char *action_argv;
+	char argv_ifilist[sizeof(":ifilist=")] = ":ifilist=";
+	char argv_ifi[IFNAMSIZ + sizeof(":ifi=")];
+	char argv_rai[IFNAMSIZ + sizeof(":rai=")];
+#ifdef ROUTEINFO
+	char argv_rti[IFNAMSIZ + sizeof(":rti=")];
+#endif
+	char argv_pfx[IFNAMSIZ + sizeof(":pfx=")];
+	char argv_rdnss[IFNAMSIZ + sizeof(":rdnss=")];
+	char argv_dnssl[IFNAMSIZ + sizeof(":dnssl=")];
+	char ssbuf[SSBUFLEN];
+
+	struct ctrl_msg_pl cp;
+	struct ifinfo *ifi;
+	TAILQ_HEAD(, ifinfo) ifl = TAILQ_HEAD_INITIALIZER(ifl);
+	char *endp;
+	char *p;
+	int error;
+	int i;
+	int len;
+
+	if (argc == 0) {
+		action_argv = argv_ifilist;
+		error = action_propget(action_argv, &cp);
+		if (error)
+			return (error);
+
+		p = cp.cp_val;
+		endp = p + cp.cp_val_len;
+		while (p < endp) {
+			ifi = malloc(sizeof(*ifi));
+			if (ifi == NULL)
+				exit(1);
+			memset(ifi, 0, sizeof(*ifi));
+
+			strcpy(ifi->ifi_ifname, p);
+			ifi->ifi_ifindex = if_nametoindex(ifi->ifi_ifname);
+			TAILQ_INSERT_TAIL(&ifl, ifi, ifi_next);
+			p += strlen(ifi->ifi_ifname) + 1;
+		}
+	} else {
+		for (i = 0; i < argc; i++) {
+			ifi = malloc(sizeof(*ifi));
+			if (ifi == NULL)
+				exit(1);
+			memset(ifi, 0, sizeof(*ifi));
+
+			strcpy(ifi->ifi_ifname, argv[i]);
+			ifi->ifi_ifindex = if_nametoindex(ifi->ifi_ifname);
+			if (ifi->ifi_ifindex == 0)
+				exit(1);
+			TAILQ_INSERT_TAIL(&ifl, ifi, ifi_next);
+		}
+	}
+
+	TAILQ_FOREACH(ifi, &ifl, ifi_next) {
+		struct ifinfo *ifi_s;
+		struct rainfo *rai;
+#ifdef ROUTEINFO
+		struct rtinfo *rti;
+#endif
+		struct prefix *pfx;
+		int c;
+		int ra_ifstatus;
+
+		sprintf(argv_ifi, "%s:ifi=", ifi->ifi_ifname);
+		action_argv = argv_ifi;
+		error = action_propget(action_argv, &cp);
+		if (error)
+			return (error);
+		ifi_s = (struct ifinfo *)cp.cp_val;
+
+		if (!(ifi_s->ifi_persist) && vflag < LOG_NOTICE)
+			continue;
+
+		printf("%s: flags=<", ifi->ifi_ifname);
+
+		/*
+		 * RA_RECV = UP + CONFIGURED + ACCEPT_RTADV
+		 * RA_SEND = UP + CONFIGURED + IPV6FORWARDING
+		 */
+
+		c = 0;
+		if (ifi_s->ifi_ifindex == 0)
+			c += printf("NONEXISTENT");
+		else
+			c += printf("%s", (ifi_s->ifi_flags & IFF_UP) ?
+			    "UP" : "DOWN");
+		if (ifi_s->ifi_state == IFI_STATE_CONFIGURED)
+			c += printf("%s%s", (c) ? "," : "", "CONFIGURED");
+
+		if (ifi_s->ifi_persist)
+			c += printf("%s%s", (c) ? "," : "", "PERSIST");
+		printf(">");
+
+		ra_ifstatus = RA_IFSTATUS_INACTIVE;
+		if ((ifi_s->ifi_flags & IFF_UP) &&
+		    (ifi_s->ifi_state == IFI_STATE_CONFIGURED)) {
+			if (ifi_s->ifi_nd_flags & ND6_IFF_ACCEPT_RTADV)
+				ra_ifstatus = RA_IFSTATUS_RA_RECV;
+			else if (getinet6sysctl(IPV6CTL_FORWARDING))
+				ra_ifstatus = RA_IFSTATUS_RA_SEND;
+			else
+				ra_ifstatus = RA_IFSTATUS_INACTIVE;
+		}
+
+		c = 0;
+		printf(" status=<");
+		if (ra_ifstatus == RA_IFSTATUS_INACTIVE)
+			printf("%s%s", (c) ? "," : "", "INACTIVE");
+		else if (ra_ifstatus == RA_IFSTATUS_RA_RECV)
+			printf("%s%s", (c) ? "," : "", "RA_RECV");
+		else if (ra_ifstatus == RA_IFSTATUS_RA_SEND)
+			printf("%s%s", (c) ? "," : "", "RA_SEND");
+		printf("> ");
+
+		if (ifi_s->ifi_state != IFI_STATE_CONFIGURED) {
+			printf("\n");
+			continue;
+		}
+
+		printf("mtu %d\n", ifi_s->ifi_phymtu);
+
+		sprintf(argv_rai, "%s:rai=", ifi->ifi_ifname);
+		action_argv = argv_rai;
+
+		error = action_propget(action_argv, &cp);
+		if (error)
+			continue;
+
+		rai = (struct rainfo *)cp.cp_val;
+
+		printf("\tDefaultLifetime: %s",
+		    sec2str(rai->rai_lifetime, ssbuf));
+		if (ra_ifstatus != RA_IFSTATUS_RA_SEND &&
+		    rai->rai_lifetime == 0)
+			printf(" (RAs will be sent with zero lifetime)");
+
+		printf("\n");
+
+		printf("\tMinAdvInterval/MaxAdvInterval: %s/%s\n",
+		    sec2str(rai->rai_mininterval, ssbuf),
+		    sec2str(rai->rai_maxinterval, ssbuf));
+		if (rai->rai_linkmtu)
+			printf("\tAdvLinkMTU: %d", rai->rai_linkmtu);
+		else
+			printf("\tAdvLinkMTU: <none>");
+
+		printf(", ");
+
+		printf("Flags: ");
+		if (rai->rai_managedflg || rai->rai_otherflg) {
+			printf("%s", rai->rai_managedflg ? "M" : "");
+			printf("%s", rai->rai_otherflg ? "O" : "");
+		} else
+			printf("<none>");
+
+		printf(", ");
+
+		printf("Preference: %s\n",
+		    rtpref_str[(rai->rai_rtpref >> 3) & 0xff]);
+
+		printf("\t"
+		    "ReachableTime: %s, "
+		    "RetransTimer: %s, "
+		    "CurHopLimit: %d\n",
+		    sec2str(rai->rai_reachabletime, ssbuf),
+		    sec2str(rai->rai_retranstimer, ssbuf),
+		    rai->rai_hoplimit);
+		printf("\tAdvIfPrefixes: %s\n",
+		    rai->rai_advifprefix ? "yes" : "no");
+		if (rai->rai_clockskew)
+			printf("\tClock skew: %ldsec\n",
+			    rai->rai_clockskew);
+
+		if (vflag < LOG_WARNING)
+			continue;
+
+#ifdef ROUTEINFO
+		/* route information */
+		sprintf(argv_rti, "%s:rti=", ifi->ifi_ifname);
+		action_argv = argv_rti;
+		error = action_propget(action_argv, &cp);
+		if (error)
+			return (error);
+
+		rti = (struct rtinfo *)cp.cp_val;
+		len = cp.cp_val_len / sizeof(*rti);
+		if (len > 0) {
+			printf("\tRoute Info:\n");
+
+			for (i = 0; i < len; i++)
+				action_show_rtinfo(&rti[i]);
+		}
+#endif
+		/* prefix information */
+		sprintf(argv_pfx, "%s:pfx=", ifi->ifi_ifname);
+		action_argv = argv_pfx;
+
+		error = action_propget(action_argv, &cp);
+		if (error)
+			continue;
+
+		pfx = (struct prefix *)cp.cp_val;
+		len = cp.cp_val_len / sizeof(*pfx);
+
+		if (len > 0) {
+			printf("\tPrefixes (%d):\n", len);
+
+			for (i = 0; i < len; i++)
+				action_show_prefix(&pfx[i]);
+		}
+
+		/* RDNSS information */
+		sprintf(argv_rdnss, "%s:rdnss=", ifi->ifi_ifname);
+		action_argv = argv_rdnss;
+
+		error = action_propget(action_argv, &cp);
+		if (error)
+			continue;
+
+		len = *((u_int16_t *)cp.cp_val);
+
+		if (len > 0) {
+			printf("\tRDNSS entries:\n");
+			action_show_rdnss(cp.cp_val);
+		}
+
+		/* DNSSL information */
+		sprintf(argv_dnssl, "%s:dnssl=", ifi->ifi_ifname);
+		action_argv = argv_dnssl;
+
+		error = action_propget(action_argv, &cp);
+		if (error)
+			continue;
+
+		len = *((u_int16_t *)cp.cp_val);
+
+		if (len > 0) {
+			printf("\tDNSSL entries:\n");
+			action_show_dnssl(cp.cp_val);
+		}
+
+		if (vflag < LOG_NOTICE)
+			continue;
+
+		printf("\n");
+
+		printf("\tLast RA sent: %s",
+		    (rai->rai_lastsent.tv_sec == 0) ? "never\n" :
+		    ctime((time_t *)&rai->rai_lastsent.tv_sec));
+		printf("\tRA initcounts/waits: %d/%d\n",
+		    rai->rai_initcounter,
+		    rai->rai_waiting);
+		printf("\tRA out/in/inconsistent: %llu/%llu/%llu\n",
+		    ifi_s->ifi_raoutput,
+		    ifi_s->ifi_rainput,
+		    ifi_s->ifi_rainconsistent);
+		printf("\tRS in: %llu\n",
+		    ifi_s->ifi_rsinput);
+
+		printf("\n");
+
+		printf("\tReceived RAs:\n");
+	}
+
+	return (0);
+}
+
+#ifdef ROUTEINFO
+static int
+action_show_rtinfo(struct rtinfo *rti)
+{
+	char ntopbuf[INET6_ADDRSTRLEN];
+	char ssbuf[SSBUFLEN];
+
+	printf("\t  %s/%d (pref: %s, ltime: %s)\n",
+	    inet_ntop(AF_INET6, &rti->rti_prefix,
+		ntopbuf, sizeof(ntopbuf)),
+	    rti->rti_prefixlen,
+	    rtpref_str[0xff & (rti->rti_rtpref >> 3)],
+	    (rti->rti_ltime == ND6_INFINITE_LIFETIME) ?
+	    "infinity" : sec2str(rti->rti_ltime, ssbuf));
+
+	return (0);
+}
+#endif
+
+static int
+action_show_prefix(struct prefix *pfx)
+{
+	char ntopbuf[INET6_ADDRSTRLEN];
+	char ssbuf[SSBUFLEN];
+	struct timeval now;
+
+	gettimeofday(&now, NULL);
+	printf("\t  %s/%d", inet_ntop(AF_INET6, &pfx->pfx_prefix,
+		ntopbuf, sizeof(ntopbuf)), pfx->pfx_prefixlen);
+
+	printf(" (");
+	switch (pfx->pfx_origin) {
+	case PREFIX_FROM_KERNEL:
+		printf("KERNEL");
+		break;
+	case PREFIX_FROM_CONFIG:
+		printf("CONFIG");
+		break;
+	case PREFIX_FROM_DYNAMIC:
+		printf("DYNAMIC");
+		break;
+	}
+
+	printf(",");
+
+	printf(" vltime=%s",
+	    (pfx->pfx_validlifetime == ND6_INFINITE_LIFETIME) ?
+	    "infinity" : sec2str(pfx->pfx_validlifetime, ssbuf));
+
+	if (pfx->pfx_vltimeexpire > 0)
+		printf("(expire: %s)",
+		    ((long)pfx->pfx_vltimeexpire > now.tv_sec) ?
+		    sec2str(pfx->pfx_vltimeexpire - now.tv_sec, ssbuf) :
+		    "0");
+
+	printf(",");
+
+	printf(" pltime=%s",
+	    (pfx->pfx_preflifetime == ND6_INFINITE_LIFETIME) ?
+	    "infinity" : sec2str(pfx->pfx_preflifetime, ssbuf));
+
+	if (pfx->pfx_pltimeexpire > 0)
+		printf("(expire %s)",
+		    ((long)pfx->pfx_pltimeexpire > now.tv_sec) ?
+		    sec2str(pfx->pfx_pltimeexpire - now.tv_sec, ssbuf) :
+		    "0");
+
+	printf(",");
+
+	printf(" flags=");
+	if (pfx->pfx_onlinkflg || pfx->pfx_autoconfflg) {
+		printf("%s", pfx->pfx_onlinkflg ? "L" : "");
+		printf("%s", pfx->pfx_autoconfflg ? "A" : "");
+	} else
+		printf("<none>");
+
+	if (pfx->pfx_timer) {
+		struct timeval *rest;
+
+		rest = rtadvd_timer_rest(pfx->pfx_timer);
+		if (rest) { /* XXX: what if not? */
+			printf(" expire=%s", sec2str(rest->tv_sec, ssbuf));
+		}
+	}
+
+	printf(")\n");
+
+	return (0);
+}
+
+static int
+action_show_rdnss(void *msg)
+{
+	struct rdnss *rdn;
+	struct rdnss_addr *rda;
+	u_int16_t *rdn_cnt;
+	u_int16_t *rda_cnt;
+	int i;
+	int j;
+	char *p;
+	u_int32_t	ltime;
+	char ntopbuf[INET6_ADDRSTRLEN];
+	char ssbuf[SSBUFLEN];
+
+	p = msg;
+	rdn_cnt = (u_int16_t *)p;
+	p += sizeof(*rdn_cnt);
+
+	if (*rdn_cnt > 0) {
+		for (i = 0; i < *rdn_cnt; i++) {
+			rdn = (struct rdnss *)p;
+			ltime = rdn->rd_ltime;
+			p += sizeof(*rdn);
+
+			rda_cnt = (u_int16_t *)p;
+			p += sizeof(*rda_cnt);
+			if (*rda_cnt > 0)
+				for (j = 0; j < *rda_cnt; j++) {
+					rda = (struct rdnss_addr *)p;
+					printf("\t  %s (ltime=%s)\n",
+					    inet_ntop(AF_INET6,
+						&rda->ra_dns,
+						ntopbuf,
+						sizeof(ntopbuf)),
+					    sec2str(ltime, ssbuf));
+					p += sizeof(*rda);
+				}
+		}
+	}
+
+	return (0);
+}
+
+static int
+action_show_dnssl(void *msg)
+{
+	struct dnssl *dns;
+	struct dnssl_addr *dna;
+	u_int16_t *dns_cnt;
+	u_int16_t *dna_cnt;
+	int i;
+	int j;
+	char *p;
+	u_int32_t ltime;
+	char hbuf[NI_MAXHOST];
+	char ssbuf[SSBUFLEN];
+
+	p = msg;
+	dns_cnt = (u_int16_t *)p;
+	p += sizeof(*dns_cnt);
+
+	if (*dns_cnt > 0) {
+		for (i = 0; i < *dns_cnt; i++) {
+			dns = (struct dnssl *)p;
+			ltime = dns->dn_ltime;
+			p += sizeof(*dns);
+
+			dna_cnt = (u_int16_t *)p;
+			p += sizeof(*dna_cnt);
+			if (*dna_cnt > 0)
+				for (j = 0; j < *dna_cnt; j++) {
+					dna = (struct dnssl_addr *)p;
+					dname_labeldec(hbuf, sizeof(hbuf),
+					    dna->da_dom);
+					printf("\t  %s (ltime=%s)\n",
+					    hbuf, sec2str(ltime, ssbuf));
+					p += sizeof(*dna);
+				}
+		}
+	}
+
+	return (0);
+}
+
+/* Decode domain name label encoding in RFC 1035 Section 3.1 */
+static size_t
+dname_labeldec(char *dst, size_t dlen, const char *src)
+{
+	size_t len;
+	const char *src_origin;
+	const char *src_last;
+	const char *dst_origin;
+
+	src_origin = src;
+	src_last = strchr(src, '\0');
+	dst_origin = dst;
+	memset(dst, '\0', dlen);
+	while (src && (len = (uint8_t)(*src++) & 0x3f) &&
+	    (src + len) <= src_last) {
+		if (dst != dst_origin)
+			*dst++ = '.';
+		mysyslog(LOG_DEBUG, "<%s> labellen = %zd", __func__, len);
+		memcpy(dst, src, len);
+		src += len;
+		dst += len;
+	}
+	*dst = '\0';
+
+	return (src - src_origin);
+}