Import macOS userland

adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106

1 files changed, 1650 insertions, 0 deletions

diff --git a/network_cmds/rtadvd.tproj/rtadvd.c b/network_cmds/rtadvd.tproj/rtadvd.c
new file mode 100644
index 0000000..be5c0f8
--- /dev/null
+++ b/network_cmds/rtadvd.tproj/rtadvd.c
@@ -0,0 +1,1650 @@
+/*
+ * Copyright (c) 2020 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+/*	$KAME: rtadvd.c,v 1.82 2003/08/05 12:34:23 itojun Exp $	*/
+
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * 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.
+ * 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.
+ */
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <sys/time.h>
+#include <sys/queue.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 <stdlib.h>
+#include <err.h>
+#include <errno.h>
+#include <libutil.h>
+#include <string.h>
+#include <stdlib.h>
+#include "rtadvd.h"
+#include "rrenum.h"
+#include "advcap.h"
+#include "timer.h"
+#include "if.h"
+#include "config.h"
+#include "dump.h"
+
+struct msghdr rcvmhdr;
+static u_char *rcvcmsgbuf;
+static size_t rcvcmsgbuflen;
+static u_char *sndcmsgbuf = NULL;
+static size_t sndcmsgbuflen;
+volatile sig_atomic_t do_dump;
+volatile sig_atomic_t do_die;
+struct msghdr sndmhdr;
+struct iovec rcviov[2];
+struct iovec sndiov[2];
+struct sockaddr_in6 rcvfrom;
+struct sockaddr_in6 sin6_allnodes = {sizeof(sin6_allnodes), AF_INET6};
+struct in6_addr in6a_site_allrouters;
+static char *dumpfilename = "/var/run/rtadvd.dump";
+static char *pidfilename = "/var/run/rtadvd.pid";
+static struct pidfh *pfh;
+static char *mcastif;
+int sock;
+int rtsock = -1;
+int accept_rr = 0;
+int dflag = 0, sflag = 0;
+int so_traffic_class = SO_TC_CTL;	/* use control class, by default */
+char *conffile = NULL;
+
+struct rainfo *ralist = NULL;
+
+struct nd_optlist {
+	struct nd_optlist *next;
+	struct nd_opt_hdr *opt;
+};
+union nd_opts {
+	struct nd_opt_hdr *nd_opt_array[9];
+	struct {
+		struct nd_opt_hdr *zero;
+		struct nd_opt_hdr *src_lladdr;
+		struct nd_opt_hdr *tgt_lladdr;
+		struct nd_opt_prefix_info *pi;
+		struct nd_opt_rd_hdr *rh;
+		struct nd_opt_mtu *mtu;
+		struct nd_optlist *list;
+	} nd_opt_each;
+};
+#define nd_opts_src_lladdr	nd_opt_each.src_lladdr
+#define nd_opts_tgt_lladdr	nd_opt_each.tgt_lladdr
+#define nd_opts_pi		nd_opt_each.pi
+#define nd_opts_rh		nd_opt_each.rh
+#define nd_opts_mtu		nd_opt_each.mtu
+#define nd_opts_list		nd_opt_each.list
+
+#define NDOPT_FLAG_SRCLINKADDR 0x1
+#define NDOPT_FLAG_TGTLINKADDR 0x2
+#define NDOPT_FLAG_PREFIXINFO 0x4
+#define NDOPT_FLAG_RDHDR 0x8
+#define NDOPT_FLAG_MTU 0x10
+
+u_int32_t ndopt_flags[] = {
+	0, NDOPT_FLAG_SRCLINKADDR, NDOPT_FLAG_TGTLINKADDR,
+	NDOPT_FLAG_PREFIXINFO, NDOPT_FLAG_RDHDR, NDOPT_FLAG_MTU,
+};
+
+int main(int, char *[]);
+static void set_die(int);
+static void die(void);
+static void sock_open(void);
+static void rtsock_open(void);
+static void rtadvd_input(void);
+static void rs_input(int, struct nd_router_solicit *,
+			  struct in6_pktinfo *, struct sockaddr_in6 *);
+static void ra_input(int, struct nd_router_advert *,
+			  struct in6_pktinfo *, struct sockaddr_in6 *);
+static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *,
+			     struct sockaddr_in6 *);
+static int nd6_options(struct nd_opt_hdr *, int,
+			    union nd_opts *, u_int32_t);
+static void free_ndopts(union nd_opts *);
+static void ra_output(struct rainfo *);
+static void rtmsg_input(void);
+static void rtadvd_set_dump_file(int);
+static void set_short_delay(struct rainfo *);
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	fd_set *fdsetp, *selectfdp;
+	int fdmasks;
+	int maxfd = 0;
+	struct timeval *timeout;
+	int i, ch;
+	int fflag = 0;
+	pid_t pid, otherpid;
+
+	/* get command line options and arguments */
+	while ((ch = getopt(argc, argv, "c:dDF:fMp:Rs")) != -1) {
+		switch (ch) {
+		case 'c':
+			conffile = optarg;
+			break;
+		case 'd':
+			dflag = 1;
+			break;
+		case 'D':
+			dflag = 2;
+			break;
+		case 'f':
+			fflag = 1;
+			break;
+		case 'M':
+			mcastif = optarg;
+			break;
+		case 'R':
+			fprintf(stderr, "rtadvd: "
+				"the -R option is currently ignored.\n");
+			/* accept_rr = 1; */
+			/* run anyway... */
+			break;
+		case 's':
+			sflag = 1;
+			break;
+		case 'p':
+			pidfilename = optarg;
+			break;
+		case 'F':
+			dumpfilename = optarg;
+			break;
+		}
+	}
+	argc -= optind;
+	argv += optind;
+	if (argc == 0) {
+		fprintf(stderr,
+			"usage: rtadvd [-dDfMRs] [-c conffile] "
+			"[-F dumpfile] [-p pidfile] interfaces...\n");
+		exit(1);
+	}
+
+	/* timer initialization */
+	rtadvd_timer_init();
+
+	/* random value initialization */
+	srandom((u_long)time(NULL));
+
+	/* get iflist block from kernel */
+	init_iflist();
+
+	while (argc--)
+		getconfig(*argv++);
+
+	if (inet_pton(AF_INET6, ALLNODES, &sin6_allnodes.sin6_addr) != 1) {
+		fprintf(stderr, "fatal: inet_pton failed\n");
+		exit(1);
+	}
+
+	pfh = pidfile_open(pidfilename, 0600, &otherpid);
+	if (pfh == NULL) {
+		if (errno == EEXIST)
+			errx(1, "%s already running, pid: %d",
+			    getprogname(), otherpid);
+		errorlog("<%s> failed to open the pid log file, run anyway.",
+		    __func__);
+	}
+
+	if (!fflag)
+		daemon(1, 0);
+
+	sock_open();
+
+	/* record the current PID */
+	pid = getpid();
+	pidfile_write(pfh);
+
+	maxfd = sock;
+	if (sflag == 0) {
+		rtsock_open();
+		if (rtsock > sock)
+			maxfd = rtsock;
+	} else
+		rtsock = -1;
+
+	fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask);
+	if ((fdsetp = malloc(fdmasks)) == NULL) {
+		err(1, "malloc");
+		/*NOTREACHED*/
+	}
+	if ((selectfdp = malloc(fdmasks)) == NULL) {
+		err(1, "malloc");
+		/*NOTREACHED*/
+	}
+	memset(fdsetp, 0, fdmasks);
+	FD_SET(sock, fdsetp);
+	if (rtsock >= 0)
+		FD_SET(rtsock, fdsetp);
+
+	signal(SIGTERM, set_die);
+	signal(SIGUSR1, rtadvd_set_dump_file);
+
+	while (1) {
+		memcpy(selectfdp, fdsetp, fdmasks); /* reinitialize */
+
+		if (do_dump) {	/* SIGUSR1 */
+			do_dump = 0;
+			rtadvd_dump_file(dumpfilename);
+		}
+
+		if (do_die) {
+			die();
+			/*NOTREACHED*/
+		}
+
+		/* timer expiration check and reset the timer */
+		timeout = rtadvd_check_timer();
+
+		if (timeout != NULL) {
+			debuglog("<%s> set timer to %ld:%ld. waiting for "
+			    "inputs or timeout", __func__,
+			    (long int)timeout->tv_sec,
+			    (long int)timeout->tv_usec);
+		} else {
+			debuglog("<%s> there's no timer. waiting for inputs",
+			    __func__);
+		}
+
+		if ((i = select(maxfd + 1, selectfdp, NULL, NULL,
+		    timeout)) < 0) {
+			/* EINTR would occur upon SIGUSR1 for status dump */
+			if (errno != EINTR)
+				errorlog( "<%s> select: %s",
+				    __func__, strerror(errno));
+			continue;
+		}
+		if (i == 0)	/* timeout */
+			continue;
+		if (rtsock != -1 && FD_ISSET(rtsock, selectfdp))
+			rtmsg_input();
+		if (FD_ISSET(sock, selectfdp))
+			rtadvd_input();
+	}
+	exit(0);		/* NOTREACHED */
+}
+
+static void
+rtadvd_set_dump_file(sig)
+	int sig;
+{
+	do_dump = 1;
+}
+
+static void
+set_die(sig)
+	int sig;
+{
+	do_die = 1;
+}
+
+static void
+die()
+{
+	struct rainfo *ra;
+	int i;
+	const int retrans = MAX_FINAL_RTR_ADVERTISEMENTS;
+
+	if (dflag > 1) {
+		debuglog("<%s> cease to be an advertising router\n",
+		    __func__);
+	}
+
+	for (ra = ralist; ra; ra = ra->next) {
+		ra->lifetime = 0;
+		make_packet(ra);
+	}
+	for (i = 0; i < retrans; i++) {
+		for (ra = ralist; ra; ra = ra->next)
+			ra_output(ra);
+			
+		if (retrans != 1)
+			sleep(MIN_DELAY_BETWEEN_RAS);
+	}
+	pidfile_remove(pfh);
+	exit(0);
+	/*NOTREACHED*/
+}
+
+static void
+rtmsg_input()
+{
+	int n, type, ifindex = 0, plen;
+	size_t len;
+	char msg[2048], *next, *lim;
+	char ifname[IF_NAMESIZE];
+	struct prefix *prefix;
+	struct rainfo *rai;
+	struct in6_addr *addr;
+	char addrbuf[INET6_ADDRSTRLEN];
+	int prefixchange = 0;
+
+	n = read(rtsock, msg, sizeof(msg));
+	if (dflag > 1) {
+		debuglog( "<%s> received a routing message "
+		    "(type = %d, len = %d)", __func__, rtmsg_type(msg), n);
+	}
+	if (n > rtmsg_len(msg)) {
+		/*
+		 * This usually won't happen for messages received on 
+		 * a routing socket.
+		 */
+		if (dflag > 1)
+			debuglog("<%s> received data length is larger than "
+			    "1st routing message len. multiple messages? "
+			    "read %d bytes, but 1st msg len = %d",
+			    __func__, n, rtmsg_len(msg));
+#if 0
+		/* adjust length */
+		n = rtmsg_len(msg);
+#endif
+	}
+
+	lim = msg + n;
+	for (next = msg; next < lim; next += len) {
+        struct if_msghdr * ifm = NULL;
+		int oldifflags;
+
+		next = get_next_msg(next, lim, 0, &len,
+				    RTADV_TYPE2BITMASK(RTM_ADD) |
+				    RTADV_TYPE2BITMASK(RTM_DELETE) |
+				    RTADV_TYPE2BITMASK(RTM_NEWADDR) |
+				    RTADV_TYPE2BITMASK(RTM_DELADDR) |
+				    RTADV_TYPE2BITMASK(RTM_IFINFO));
+		if (len == 0)
+			break;
+		type = rtmsg_type(next);
+		switch (type) {
+		case RTM_ADD:
+		case RTM_DELETE:
+			ifindex = get_rtm_ifindex(next);
+			break;
+		case RTM_NEWADDR:
+		case RTM_DELADDR:
+			ifindex = get_ifam_ifindex(next);
+			break;
+		case RTM_IFINFO:
+			ifindex = get_ifm_ifindex(next);
+			break;
+		default:
+			/* should not reach here */
+			if (dflag > 1) {
+				debuglog("<%s:%d> unknown rtmsg %d on %s",
+				       __func__, __LINE__, type,
+				       if_indextoname(ifindex, ifname));
+			}
+			continue;
+		}
+
+		if ((rai = if_indextorainfo(ifindex)) == NULL) {
+			if (dflag > 1) {
+				debuglog("<%s> route changed on "
+				       "non advertising interface(%s)",
+				       __func__,
+				       if_indextoname(ifindex, ifname));
+			}
+			continue;
+		}
+        ifm = get_interface_entry(ifindex);
+        if (ifm == NULL) {
+            debuglog("Couldn't find interface entry for %d. Skipping.", ifindex);
+            continue;
+        }
+		oldifflags = ifm->ifm_flags;
+
+		switch (type) {
+		case RTM_ADD:
+			/* init ifflags because it may have changed */
+			ifm->ifm_flags =
+			    if_getflags(ifindex, ifm->ifm_flags);
+
+			if (sflag)
+				break;	/* we aren't interested in prefixes  */
+
+			addr = get_addr(msg);
+			plen = get_prefixlen(msg);
+			/* sanity check for plen */
+			/* as RFC2373, prefixlen is at least 4 */
+			if (plen < 4 || plen > 127) {
+				infolog("<%s> new interface route's"
+				    "plen %d is invalid for a prefix",
+				    __func__, plen);
+				break;
+			}
+			prefix = find_prefix(rai, addr, plen);
+			if (prefix) {
+				if (prefix->timer) {
+					/*
+					 * If the prefix has been invalidated,
+					 * make it available again.
+					 */
+					update_prefix(prefix);
+					prefixchange = 1;
+				} else if (dflag > 1) {
+					debuglog("<%s> new prefix(%s/%d) "
+					    "added on %s, "
+					    "but it was already in list",
+					    __func__,
+					    inet_ntop(AF_INET6, addr,
+					    (char *)addrbuf, INET6_ADDRSTRLEN),
+					    plen, rai->ifname);
+				}
+				break;
+			}
+			make_prefix(rai, ifindex, addr, plen);
+			prefixchange = 1;
+			break;
+		case RTM_DELETE:
+			/* init ifflags because it may have changed */
+			ifm->ifm_flags = if_getflags(ifindex, ifm->ifm_flags);
+
+			if (sflag)
+				break;
+
+			addr = get_addr(msg);
+			plen = get_prefixlen(msg);
+			/* sanity check for plen */
+			/* as RFC2373, prefixlen is at least 4 */
+			if (plen < 4 || plen > 127) {
+				infolog("<%s> deleted interface route's "
+				    "plen %d is invalid for a prefix",
+				    __func__, plen);
+				break;
+			}
+			prefix = find_prefix(rai, addr, plen);
+			if (prefix == NULL) {
+				if (dflag > 1) {
+					debuglog("<%s> prefix(%s/%d) was "
+					    "deleted on %s, "
+					    "but it was not in list",
+					    __func__,
+					    inet_ntop(AF_INET6, addr,
+					    (char *)addrbuf, INET6_ADDRSTRLEN),
+					    plen, rai->ifname);
+				}
+				break;
+			}
+			invalidate_prefix(prefix);
+			prefixchange = 1;
+			break;
+		case RTM_NEWADDR:
+		case RTM_DELADDR:
+			/* init ifflags because it may have changed */
+			ifm->ifm_flags = if_getflags(ifindex, ifm->ifm_flags);
+			break;
+		case RTM_IFINFO:
+			ifm->ifm_flags = get_ifm_flags(next);
+			break;
+		default:
+			/* should not reach here */
+			if (dflag > 1) {
+				debuglog("<%s:%d> unknown rtmsg %d on %s",
+				    __func__, __LINE__, type,
+				    if_indextoname(ifindex, ifname));
+			}
+			return;
+		}
+
+		/* check if an interface flag is changed */
+		if ((oldifflags & IFF_UP) && /* UP to DOWN */
+		    !(ifm->ifm_flags & IFF_UP)) {
+			infolog("<%s> interface %s becomes down. stop timer.",
+			    __func__, rai->ifname);
+			rtadvd_remove_timer(&rai->timer);
+		} else if (!(oldifflags & IFF_UP) && /* DOWN to UP */
+			 (ifm->ifm_flags & IFF_UP)) {
+			infolog("<%s> interface %s becomes up. restart timer.",
+			    __func__, rai->ifname);
+
+			rai->initcounter = 0; /* reset the counter */
+			rai->waiting = 0; /* XXX */
+			rai->timer = rtadvd_add_timer(ra_timeout,
+			    ra_timer_update, rai, rai);
+			ra_timer_update((void *)rai, &rai->timer->tm);
+			rtadvd_set_timer(&rai->timer->tm, rai->timer);
+		} else if (prefixchange &&
+		    (ifm->ifm_flags & IFF_UP)) {
+			/*
+			 * An advertised prefix has been added or invalidated.
+			 * Will notice the change in a short delay.
+			 */
+			rai->initcounter = 0;
+			set_short_delay(rai);
+		}
+	}
+
+	return;
+}
+
+void
+rtadvd_input()
+{
+	int i;
+	int *hlimp = NULL;
+#ifdef OLDRAWSOCKET
+	struct ip6_hdr *ip;
+#endif 
+	struct icmp6_hdr *icp;
+	int ifindex = 0;
+	struct cmsghdr *cm;
+	struct in6_pktinfo *pi = NULL;
+	char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
+	struct in6_addr dst = in6addr_any;
+    struct if_msghdr *ifm = NULL;
+
+	/*
+	 * Get message. We reset msg_controllen since the field could
+	 * be modified if we had received a message before setting
+	 * receive options.
+	 */
+	rcvmhdr.msg_controllen = rcvcmsgbuflen;
+	if ((i = recvmsg(sock, &rcvmhdr, 0)) < 0)
+		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;
+			dst = pi->ipi6_addr;
+		}
+		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) {
+		errorlog("<%s> failed to get receiving interface",
+		       __func__);
+		return;
+	}
+	if (hlimp == NULL) {
+		errorlog("<%s> failed to get receiving hop limit",
+		       __func__);
+		return;
+	}
+
+    ifm = get_interface_entry(pi->ipi6_ifindex);
+	/*
+	 * If we happen to receive data on an interface which is now gone
+	 * or down, just discard the data.
+	 */
+	if (ifm == NULL ||
+	    (ifm->ifm_flags & IFF_UP) == 0) {
+		infolog("<%s> received data on a disabled interface (%s)",
+		       __func__,
+		       (ifm == NULL) ? "[gone]" :
+			    if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+		return;
+	}
+
+#ifdef OLDRAWSOCKET
+	if (i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) {
+		errorlog("<%s> packet size(%d) is too short",
+		       __func__, i);
+		return;
+	}
+
+	ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base;
+	icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */
+#else
+	if (i < sizeof(struct icmp6_hdr)) {
+		errorlog("<%s> packet size(%d) is too short",
+		       __func__, i);
+		return;
+	}
+
+	icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
+#endif
+
+	switch (icp->icmp6_type) {
+	case ND_ROUTER_SOLICIT:
+		/*
+		 * Message verification - RFC-2461 6.1.1
+		 * XXX: these checks must be done in the kernel as well,
+		 *      but we can't completely rely on them.
+		 */
+		if (*hlimp != 255) {
+			noticelog("<%s> RS with invalid hop limit(%d) "
+			    "received from %s on %s",
+			    __func__, *hlimp,
+			    inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
+			    INET6_ADDRSTRLEN),
+			    if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+			return;
+		}
+		if (icp->icmp6_code) {
+			noticelog("<%s> RS with invalid ICMP6 code(%d) "
+			    "received from %s on %s",
+			    __func__, icp->icmp6_code,
+			    inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
+			    INET6_ADDRSTRLEN),
+			    if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+			return;
+		}
+		if (i < sizeof(struct nd_router_solicit)) {
+			noticelog("<%s> RS from %s on %s does not have enough "
+			    "length (len = %d)",
+			    __func__,
+			    inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
+			    INET6_ADDRSTRLEN),
+			    if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
+			return;
+		}
+		rs_input(i, (struct nd_router_solicit *)icp, pi, &rcvfrom);
+		break;
+	case ND_ROUTER_ADVERT:
+		/*
+		 * Message verification - RFC-2461 6.1.2
+		 * XXX: there's a same dilemma as above... 
+		 */
+		if (*hlimp != 255) {
+			noticelog("<%s> RA with invalid hop limit(%d) "
+			    "received from %s on %s",
+			    __func__, *hlimp,
+			    inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
+			    INET6_ADDRSTRLEN),
+			    if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+			return;
+		}
+		if (icp->icmp6_code) {
+			noticelog("<%s> RA with invalid ICMP6 code(%d) "
+			    "received from %s on %s",
+			    __func__, icp->icmp6_code,
+			    inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
+			    INET6_ADDRSTRLEN),
+			    if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+			return;
+		}
+		if (i < sizeof(struct nd_router_advert)) {
+			noticelog("<%s> RA from %s on %s does not have enough "
+			    "length (len = %d)",
+			    __func__,
+			    inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
+			    INET6_ADDRSTRLEN),
+			    if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
+			return;
+		}
+		ra_input(i, (struct nd_router_advert *)icp, pi, &rcvfrom);
+		break;
+	case ICMP6_ROUTER_RENUMBERING:
+		if (accept_rr == 0) {
+			errorlog("<%s> received a router renumbering "
+			    "message, but not allowed to be accepted",
+			    __func__);
+			break;
+		}
+		rr_input(i, (struct icmp6_router_renum *)icp, pi, &rcvfrom,
+			 &dst);
+		break;
+	default:
+		/*
+		 * Note that this case is POSSIBLE, especially just
+		 * after invocation of the daemon. This is because we
+		 * could receive message after opening the socket and
+		 * before setting ICMP6 type filter(see sock_open()).
+		 */
+		errorlog("<%s> invalid icmp type(%d)",
+		    __func__, icp->icmp6_type);
+		return;
+	}
+
+	return;
+}
+
+static void
+rs_input(int len, struct nd_router_solicit *rs,
+	 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
+{
+	char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
+	union nd_opts ndopts;
+	struct rainfo *ra;
+	struct soliciter *sol;
+
+	debuglog(
+	       "<%s> RS received from %s on %s",
+	       __func__,
+	       inet_ntop(AF_INET6, &from->sin6_addr,
+			 ntopbuf, INET6_ADDRSTRLEN),
+	       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+
+	/* ND option check */
+	memset(&ndopts, 0, sizeof(ndopts));
+	if (nd6_options((struct nd_opt_hdr *)(rs + 1),
+			len - sizeof(struct nd_router_solicit),
+			&ndopts, NDOPT_FLAG_SRCLINKADDR)) {
+		infolog("<%s> ND option check failed for an RS from %s on %s",
+		       __func__,
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+		return;
+	}
+
+	/*
+	 * If the IP source address is the unspecified address, there
+	 * must be no source link-layer address option in the message.
+	 * (RFC-2461 6.1.1)
+	 */
+	if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) &&
+	    ndopts.nd_opts_src_lladdr) {
+		infolog("<%s> RS from unspecified src on %s has a link-layer"
+		       " address option",
+		       __func__,
+		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+		goto done;
+	}
+
+	ra = ralist;
+	while (ra != NULL) {
+		if (pi->ipi6_ifindex == ra->ifindex)
+			break;
+		ra = ra->next;
+	}
+	if (ra == NULL) {
+		infolog("<%s> RS received on non advertising interface(%s)",
+		       __func__,
+		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+		goto done;
+	}
+
+	ra->rsinput++;		/* increment statistics */
+
+	/*
+	 * Decide whether to send RA according to the rate-limit
+	 * consideration.
+	 */
+
+	/* record sockaddr waiting for RA, if possible */
+	sol = (struct soliciter *)malloc(sizeof(*sol));
+	if (sol) {
+		sol->addr = *from;
+		/* XXX RFC2553 need clarification on flowinfo */
+		sol->addr.sin6_flowinfo = 0;
+		sol->next = ra->soliciter;
+		ra->soliciter = sol;
+	}
+
+	/*
+	 * If there is already a waiting RS packet, don't
+	 * update the timer.
+	 */
+	if (ra->waiting++)
+		goto done;
+
+	set_short_delay(ra);
+
+  done:
+	free_ndopts(&ndopts);
+	return;
+}
+
+static void
+set_short_delay(rai)
+	struct rainfo *rai;
+{
+	long delay;	/* must not be greater than 1000000 */
+	struct timeval interval, now, min_delay, tm_tmp, *rest;
+
+	if (rai->timer == NULL)
+		return;
+	/*
+	 * Compute a random delay. If the computed value
+	 * corresponds to a time later than the time the next
+	 * multicast RA is scheduled to be sent, ignore the random
+	 * delay and send the advertisement at the
+	 * already-scheduled time. RFC-2461 6.2.6
+	 */
+#ifdef HAVE_ARC4RANDOM
+	delay = arc4random_uniform(MAX_RA_DELAY_TIME);
+#else
+	delay = random() % MAX_RA_DELAY_TIME;
+#endif
+	interval.tv_sec = 0;
+	interval.tv_usec = delay;
+	rest = rtadvd_timer_rest(rai->timer);
+	if (TIMEVAL_LT(*rest, interval)) {
+		debuglog("<%s> random delay is larger than "
+		    "the rest of the current timer", __func__);
+		interval = *rest;
+	}
+
+	/*
+	 * If we sent a multicast Router Advertisement within
+	 * the last MIN_DELAY_BETWEEN_RAS seconds, schedule
+	 * the advertisement to be sent at a time corresponding to
+	 * MIN_DELAY_BETWEEN_RAS plus the random value after the
+	 * previous advertisement was sent.
+	 */
+	gettimeofday(&now, NULL);
+	TIMEVAL_SUB(&now, &rai->lastsent, &tm_tmp);
+	min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS;
+	min_delay.tv_usec = 0;
+	if (TIMEVAL_LT(tm_tmp, min_delay)) {
+		TIMEVAL_SUB(&min_delay, &tm_tmp, &min_delay);
+		TIMEVAL_ADD(&min_delay, &interval, &interval);
+	}
+	rtadvd_set_timer(&interval, rai->timer);
+}
+
+static void
+ra_input(int len, struct nd_router_advert *ra,
+	 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
+{
+	struct rainfo *rai;
+	char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
+	union nd_opts ndopts;
+	char *on_off[] = {"OFF", "ON"};
+	u_int32_t reachabletime, retranstimer, mtu;
+	int inconsistent = 0;
+
+	debuglog("<%s> RA received from %s on %s",
+	       __func__,
+	       inet_ntop(AF_INET6, &from->sin6_addr,
+			 ntopbuf, INET6_ADDRSTRLEN),
+	       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+	
+	/* ND option check */
+	memset(&ndopts, 0, sizeof(ndopts));
+	if (nd6_options((struct nd_opt_hdr *)(ra + 1),
+			len - sizeof(struct nd_router_advert),
+			&ndopts, NDOPT_FLAG_SRCLINKADDR |
+			NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU)) {
+		infolog("<%s> ND option check failed for an RA from %s on %s",
+		       __func__,
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+		return;
+	}
+
+	/*
+	 * RA consistency check according to RFC-2461 6.2.7
+	 */
+	if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == 0) {
+		infolog("<%s> received RA from %s on non-advertising"
+		       " interface(%s)",
+		       __func__,
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+		goto done;
+	}
+	rai->rainput++;		/* increment statistics */
+	
+	/* Cur Hop Limit value */
+	if (ra->nd_ra_curhoplimit && rai->hoplimit &&
+	    ra->nd_ra_curhoplimit != rai->hoplimit) {
+		infolog("<%s> CurHopLimit inconsistent on %s:"
+		       " %d from %s, %d from us",
+		       __func__,
+		       rai->ifname,
+		       ra->nd_ra_curhoplimit,
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       rai->hoplimit);
+		inconsistent++;
+	}
+	/* M flag */
+	if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) !=
+	    rai->managedflg) {
+		infolog("<%s> M flag inconsistent on %s:"
+		       " %s from %s, %s from us",
+		       __func__,
+		       rai->ifname,
+		       on_off[!rai->managedflg],
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       on_off[rai->managedflg]);
+		inconsistent++;
+	}
+	/* O flag */
+	if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) !=
+	    rai->otherflg) {
+		infolog("<%s> O flag inconsistent on %s:"
+		       " %s from %s, %s from us",
+		       __func__,
+		       rai->ifname,
+		       on_off[!rai->otherflg],
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       on_off[rai->otherflg]);
+		inconsistent++;
+	}
+	/* Reachable Time */
+	reachabletime = ntohl(ra->nd_ra_reachable);
+	if (reachabletime && rai->reachabletime &&
+	    reachabletime != rai->reachabletime) {
+		infolog("<%s> ReachableTime inconsistent on %s:"
+		       " %d from %s, %d from us",
+		       __func__,
+		       rai->ifname,
+		       reachabletime,
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       rai->reachabletime);
+		inconsistent++;
+	}
+	/* Retrans Timer */
+	retranstimer = ntohl(ra->nd_ra_retransmit);
+	if (retranstimer && rai->retranstimer &&
+	    retranstimer != rai->retranstimer) {
+		infolog("<%s> RetranceTimer inconsistent on %s:"
+		       " %d from %s, %d from us",
+		       __func__,
+		       rai->ifname,
+		       retranstimer,
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       rai->retranstimer);
+		inconsistent++;
+	}
+	/* Values in the MTU options */
+	if (ndopts.nd_opts_mtu) {
+		mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
+		if (mtu && rai->linkmtu && mtu != rai->linkmtu) {
+			infolog("<%s> MTU option value inconsistent on %s:"
+			       " %d from %s, %d from us",
+			       __func__,
+			       rai->ifname, mtu,
+			       inet_ntop(AF_INET6, &from->sin6_addr,
+					 ntopbuf, INET6_ADDRSTRLEN),
+			       rai->linkmtu);
+			inconsistent++;
+		}
+	}
+	/* Preferred and Valid Lifetimes for prefixes */
+	{
+		struct nd_optlist *optp = ndopts.nd_opts_list;
+
+		if (ndopts.nd_opts_pi) {
+			if (prefix_check(ndopts.nd_opts_pi, rai, from))
+				inconsistent++;
+		}
+		while (optp) {
+			if (prefix_check((struct nd_opt_prefix_info *)optp->opt,
+					 rai, from))
+				inconsistent++;
+			optp = optp->next;
+		}
+	}
+
+	if (inconsistent)
+		rai->rainconsistent++;
+	
+  done:
+	free_ndopts(&ndopts);
+	return;
+}
+
+/* return a non-zero value if the received prefix is inconsitent with ours */
+static int
+prefix_check(struct nd_opt_prefix_info *pinfo,
+	     struct rainfo *rai, struct sockaddr_in6 *from)
+{
+	u_int32_t preferred_time, valid_time;
+	struct prefix *pp;
+	int inconsistent = 0;
+	char ntopbuf[INET6_ADDRSTRLEN], prefixbuf[INET6_ADDRSTRLEN];
+	struct timeval now;
+
+#if 0				/* impossible */
+	if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION)
+		return(0);
+#endif
+
+	/*
+	 * log if the adveritsed prefix has link-local scope(sanity check?)
+	 */
+	if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix)) {
+		infolog("<%s> link-local prefix %s/%d is advertised "
+		       "from %s on %s",
+		       __func__,
+		       inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
+				 prefixbuf, INET6_ADDRSTRLEN),
+		       pinfo->nd_opt_pi_prefix_len,
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       rai->ifname);
+	}
+
+	if ((pp = find_prefix(rai, &pinfo->nd_opt_pi_prefix,
+			      pinfo->nd_opt_pi_prefix_len)) == NULL) {
+		infolog("<%s> prefix %s/%d from %s on %s is not in our list",
+		       __func__,
+		       inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
+				 prefixbuf, INET6_ADDRSTRLEN),
+		       pinfo->nd_opt_pi_prefix_len,
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       rai->ifname);
+		return(0);
+	}
+
+	preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time);
+	if (pp->pltimeexpire) {
+		/*
+		 * The lifetime is decremented in real time, so we should
+		 * compare the expiration time.
+		 * (RFC 2461 Section 6.2.7.)
+		 * XXX: can we really expect that all routers on the link
+		 * have synchronized clocks?
+		 */
+		gettimeofday(&now, NULL);
+		preferred_time += now.tv_sec;
+
+		if (!pp->timer && rai->clockskew &&
+		    preferred_time - pp->pltimeexpire > rai->clockskew) {
+			infolog("<%s> preferred lifetime for %s/%d"
+			       " (decr. in real time) inconsistent on %s:"
+			       " %d from %s, %ld from us",
+			       __func__,
+			       inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
+					 prefixbuf, INET6_ADDRSTRLEN),
+			       pinfo->nd_opt_pi_prefix_len,
+			       rai->ifname, preferred_time,
+			       inet_ntop(AF_INET6, &from->sin6_addr,
+					 ntopbuf, INET6_ADDRSTRLEN),
+			       pp->pltimeexpire);
+			inconsistent++;
+		}
+	} else if (!pp->timer && preferred_time != pp->preflifetime) {
+		infolog("<%s> preferred lifetime for %s/%d"
+		       " inconsistent on %s:"
+		       " %d from %s, %d from us",
+		       __func__,
+		       inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
+				 prefixbuf, INET6_ADDRSTRLEN),
+		       pinfo->nd_opt_pi_prefix_len,
+		       rai->ifname, preferred_time,
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       pp->preflifetime);
+	}
+
+	valid_time = ntohl(pinfo->nd_opt_pi_valid_time);
+	if (pp->vltimeexpire) {
+		gettimeofday(&now, NULL);
+		valid_time += now.tv_sec;
+
+		if (!pp->timer && rai->clockskew &&
+		    valid_time - pp->vltimeexpire > rai->clockskew) {
+			infolog("<%s> valid lifetime for %s/%d"
+			       " (decr. in real time) inconsistent on %s:"
+			       " %d from %s, %ld from us",
+			       __func__,
+			       inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
+					 prefixbuf, INET6_ADDRSTRLEN),
+			       pinfo->nd_opt_pi_prefix_len,
+			       rai->ifname, preferred_time,
+			       inet_ntop(AF_INET6, &from->sin6_addr,
+					 ntopbuf, INET6_ADDRSTRLEN),
+			       pp->vltimeexpire);
+			inconsistent++;
+		}
+	} else if (!pp->timer && valid_time != pp->validlifetime) {
+		infolog("<%s> valid lifetime for %s/%d"
+		       " inconsistent on %s:"
+		       " %d from %s, %d from us",
+		       __func__,
+		       inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
+				 prefixbuf, INET6_ADDRSTRLEN),
+		       pinfo->nd_opt_pi_prefix_len,
+		       rai->ifname, valid_time,
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				 ntopbuf, INET6_ADDRSTRLEN),
+		       pp->validlifetime);
+		inconsistent++;
+	}
+
+	return(inconsistent);
+}
+
+struct prefix *
+find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen)
+{
+	struct prefix *pp;
+	int bytelen, bitlen;
+	u_char bitmask;
+
+	for (pp = rai->prefix.next; pp != &rai->prefix; pp = pp->next) {
+		if (plen != pp->prefixlen)
+			continue;
+		bytelen = plen / 8;
+		bitlen = plen % 8;
+		bitmask = 0xff << (8 - bitlen);
+		if (memcmp((void *)prefix, (void *)&pp->prefix, bytelen))
+			continue;
+		if (bitlen == 0 ||
+		    ((prefix->s6_addr[bytelen] & bitmask) == 
+		     (pp->prefix.s6_addr[bytelen] & bitmask))) {
+			return(pp);
+		}
+	}
+
+	return(NULL);
+}
+
+/* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */
+int
+prefix_match(struct in6_addr *p0, int plen0,
+	     struct in6_addr *p1, int plen1)
+{
+	int bytelen, bitlen;
+	u_char bitmask;
+
+	if (plen0 < plen1)
+		return(0);
+	bytelen = plen1 / 8;
+	bitlen = plen1 % 8;
+	bitmask = 0xff << (8 - bitlen);
+	if (memcmp((void *)p0, (void *)p1, bytelen))
+		return(0);
+	if (bitlen == 0 ||
+	    ((p0->s6_addr[bytelen] & bitmask) ==
+	     (p1->s6_addr[bytelen] & bitmask))) {
+		return(1);
+	}
+
+	return(0);
+}
+
+static int
+nd6_options(struct nd_opt_hdr *hdr, int limit,
+	    union nd_opts *ndopts, u_int32_t optflags)
+{
+	int optlen = 0;
+
+	for (; limit > 0; limit -= optlen) {
+		if (limit < sizeof(struct nd_opt_hdr)) {
+			infolog("<%s> short option header", __func__);
+			goto bad;
+		}
+
+		hdr = (struct nd_opt_hdr *)((caddr_t)hdr + optlen);
+		if (hdr->nd_opt_len == 0) {
+			infolog("<%s> bad ND option length(0) (type = %d)",
+			    __func__, hdr->nd_opt_type);
+			goto bad;
+		}
+		optlen = hdr->nd_opt_len << 3;
+		if (optlen > limit) {
+			infolog("<%s> short option", __func__);
+			goto bad;
+		}
+
+		if (hdr->nd_opt_type > ND_OPT_MTU) {
+			infolog("<%s> unknown ND option(type %d)",
+			    __func__, hdr->nd_opt_type);
+			continue;
+		}
+
+		if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) {
+			infolog("<%s> unexpected ND option(type %d)",
+			    __func__, hdr->nd_opt_type);
+			continue;
+		}
+
+		/*
+		 * Option length check.  Do it here for all fixed-length
+		 * options.
+		 */
+		if ((hdr->nd_opt_type == ND_OPT_MTU &&
+		    (optlen != sizeof(struct nd_opt_mtu))) ||
+		    ((hdr->nd_opt_type == ND_OPT_PREFIX_INFORMATION &&
+		    optlen != sizeof(struct nd_opt_prefix_info)))) {
+			infolog("<%s> invalid option length",
+			    __func__);
+			continue;
+		}
+
+		switch (hdr->nd_opt_type) {
+		case ND_OPT_TARGET_LINKADDR:
+		case ND_OPT_REDIRECTED_HEADER:
+			break;	/* we don't care about these options */
+		case ND_OPT_SOURCE_LINKADDR:
+		case ND_OPT_MTU:
+			if (ndopts->nd_opt_array[hdr->nd_opt_type]) {
+				infolog("<%s> duplicated ND option (type = %d)",
+				    __func__, hdr->nd_opt_type);
+			}
+			ndopts->nd_opt_array[hdr->nd_opt_type] = hdr;
+			break;
+		case ND_OPT_PREFIX_INFORMATION:
+		{
+			struct nd_optlist *pfxlist;
+
+			if (ndopts->nd_opts_pi == 0) {
+				ndopts->nd_opts_pi =
+				    (struct nd_opt_prefix_info *)hdr;
+				continue;
+			}
+			if ((pfxlist = malloc(sizeof(*pfxlist))) == NULL) {
+				errorlog("<%s> can't allocate memory",
+				    __func__);
+				goto bad;
+			}
+			pfxlist->next = ndopts->nd_opts_list;
+			pfxlist->opt = hdr;
+			ndopts->nd_opts_list = pfxlist;
+
+			break;
+		}
+		default:	/* impossible */
+			break;
+		}
+	}
+
+	return(0);
+
+  bad:
+	free_ndopts(ndopts);
+
+	return(-1);
+}
+
+static void
+free_ndopts(union nd_opts *ndopts)
+{
+	struct nd_optlist *opt = ndopts->nd_opts_list, *next;
+
+	while (opt) {
+		next = opt->next;
+		free(opt);
+		opt = next;
+	}
+}
+
+void
+sock_open()
+{
+	struct icmp6_filter filt;
+	struct ipv6_mreq mreq;
+	struct rainfo *ra = ralist;
+	int on;
+	/* XXX: should be max MTU attached to the node */
+	static u_char answer[1500];
+
+	rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
+				CMSG_SPACE(sizeof(int));
+	rcvcmsgbuf = (u_char *)malloc(rcvcmsgbuflen);
+	if (rcvcmsgbuf == NULL) {
+		errorlog("<%s> not enough core", __func__);
+		exit(1);
+	}
+
+	sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 
+				CMSG_SPACE(sizeof(int));
+	sndcmsgbuf = (u_char *)malloc(sndcmsgbuflen);
+	if (sndcmsgbuf == NULL) {
+		errorlog("<%s> not enough core", __func__);
+		exit(1);
+	}
+
+	if ((sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
+		errorlog("<%s> socket: %s", __func__,
+		       strerror(errno));
+		exit(1);
+	}
+
+	(void) setsockopt(sock, SOL_SOCKET, SO_TRAFFIC_CLASS,
+	    (void *)&so_traffic_class, sizeof (so_traffic_class));
+
+	/* specify to tell receiving interface */
+	on = 1;
+#ifdef IPV6_RECVPKTINFO
+	if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
+		       sizeof(on)) < 0) {
+		errorlog("<%s> IPV6_RECVPKTINFO: %s",
+		       __func__, strerror(errno));
+		exit(1);
+	}
+#else  /* old adv. API */
+	if (setsockopt(sock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
+		       sizeof(on)) < 0) {
+		errorlog("<%s> IPV6_PKTINFO: %s",
+		       __func__, strerror(errno));
+		exit(1);
+	}
+#endif 
+
+	on = 1;
+	/* specify to tell value of hoplimit field of received IP6 hdr */
+#ifdef IPV6_RECVHOPLIMIT
+	if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
+		       sizeof(on)) < 0) {
+		errorlog( "<%s> IPV6_RECVHOPLIMIT: %s",
+		       __func__, strerror(errno));
+		exit(1);
+	}
+#else  /* old adv. API */
+	if (setsockopt(sock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
+		       sizeof(on)) < 0) {
+		errorlog("<%s> IPV6_HOPLIMIT: %s",
+		       __func__, strerror(errno));
+		exit(1);
+	}
+#endif
+
+	on = 1;
+	if (setsockopt(sock, IPPROTO_IPV6, IPV6_DONTFRAG, &on,
+		       sizeof(on)) < 0) {
+		errorlog("<%s> IPV6_DONTFRAG: %s",
+		       __func__, strerror(errno));
+		exit(1);
+	}
+
+	ICMP6_FILTER_SETBLOCKALL(&filt);
+	ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt);
+	ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
+	if (accept_rr)
+		ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
+	if (setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
+		       sizeof(filt)) < 0) {
+		errorlog("<%s> IICMP6_FILTER: %s",
+		       __func__, strerror(errno));
+		exit(1);
+	}
+
+	/*
+	 * join all routers multicast address on each advertising interface.
+	 */
+	if (inet_pton(AF_INET6, ALLROUTERS_LINK,
+		      &mreq.ipv6mr_multiaddr.s6_addr)
+	    != 1) {
+		errorlog("<%s> inet_pton failed(library bug?)",
+		       __func__);
+		exit(1);
+	}
+	while (ra) {
+		mreq.ipv6mr_interface = ra->ifindex;
+		if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
+			       sizeof(mreq)) < 0) {
+			errorlog("<%s> IPV6_JOIN_GROUP(link) on %s: %s",
+			       __func__, ra->ifname, strerror(errno));
+			exit(1);
+		}
+		ra = ra->next;
+	}
+
+	/*
+	 * When attending router renumbering, join all-routers site-local
+	 * multicast group. 
+	 */
+	if (accept_rr) {
+		if (inet_pton(AF_INET6, ALLROUTERS_SITE,
+			      &in6a_site_allrouters) != 1) {
+			errorlog("<%s> inet_pton failed(library bug?)",
+			       __func__);
+			exit(1);
+		}
+		mreq.ipv6mr_multiaddr = in6a_site_allrouters;
+		if (mcastif) {
+			if ((mreq.ipv6mr_interface = if_nametoindex(mcastif))
+			    == 0) {
+				errorlog("<%s> invalid interface: %s",
+				       __func__, mcastif);
+				exit(1);
+			}
+		} else
+			mreq.ipv6mr_interface = ralist->ifindex;
+		if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
+			       &mreq, sizeof(mreq)) < 0) {
+			errorlog("<%s> IPV6_JOIN_GROUP(site) on %s: %s",
+			       __func__,
+			       mcastif ? mcastif : ralist->ifname,
+			       strerror(errno));
+			exit(1);
+		}
+	}
+	
+	/* initialize msghdr for receiving packets */
+	rcviov[0].iov_base = (caddr_t)answer;
+	rcviov[0].iov_len = sizeof(answer);
+	rcvmhdr.msg_name = (caddr_t)&rcvfrom;
+	rcvmhdr.msg_namelen = sizeof(rcvfrom);
+	rcvmhdr.msg_iov = rcviov;
+	rcvmhdr.msg_iovlen = 1;
+	rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
+	rcvmhdr.msg_controllen = rcvcmsgbuflen;
+
+	/* 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 = sndcmsgbuflen;
+	
+	return;
+}
+
+/* open a routing socket to watch the routing table */
+static void
+rtsock_open()
+{
+	if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
+		errorlog("<%s> socket: %s", __func__, strerror(errno));
+		exit(1);
+	}
+}
+
+struct rainfo *
+if_indextorainfo(int idx)
+{
+	struct rainfo *rai = ralist;
+
+	for (rai = ralist; rai; rai = rai->next) {
+		if (rai->ifindex == idx)
+			return(rai);
+	}
+
+	return(NULL);		/* search failed */
+}
+
+static void
+ra_output(rainfo)
+struct rainfo *rainfo;
+{
+	int i;
+	struct cmsghdr *cm;
+	struct in6_pktinfo *pi;
+	struct soliciter *sol, *nextsol;
+    struct if_msghdr *ifm = get_interface_entry(rainfo->ifindex);
+
+	if (ifm == NULL ||
+	    (ifm->ifm_flags & IFF_UP) == 0) {
+		debuglog("<%s> %s is not up, skip sending RA",
+		       __func__, rainfo->ifname);
+		return;
+	}
+
+	make_packet(rainfo);	/* XXX: inefficient */
+
+	sndmhdr.msg_name = (caddr_t)&sin6_allnodes;
+	sndmhdr.msg_iov[0].iov_base = (caddr_t)rainfo->ra_data;
+	sndmhdr.msg_iov[0].iov_len = rainfo->ra_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 = rainfo->ifindex;
+
+	/* 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));
+	}
+
+	debuglog("<%s> send RA on %s, # of waitings = %d",
+	       __func__, rainfo->ifname, rainfo->waiting); 
+
+	i = sendmsg(sock, &sndmhdr, 0);
+
+	if (i < 0 || i != rainfo->ra_datalen)  {
+		if (i < 0) {
+			errorlog("<%s> sendmsg on %s: %s",
+			       __func__, rainfo->ifname,
+			       strerror(errno));
+		}
+	}
+	/* update counter */
+	if (rainfo->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS)
+		rainfo->initcounter++;
+	rainfo->raoutput++;
+
+	/*
+	 * unicast advertisements
+	 * XXX commented out.  reason: though spec does not forbit it, unicast
+	 * advert does not really help
+	 */
+	for (sol = rainfo->soliciter; sol; sol = nextsol) {
+		nextsol = sol->next;
+
+		sol->next = NULL;
+		free(sol);
+	}
+	rainfo->soliciter = NULL;
+
+	/* update timestamp */
+	gettimeofday(&rainfo->lastsent, NULL);
+
+	/* reset waiting conter */
+	rainfo->waiting = 0;
+}
+
+/* process RA timer */
+struct rtadvd_timer *
+ra_timeout(void *data)
+{
+	struct rainfo *rai = (struct rainfo *)data;
+
+#ifdef notyet
+	/* if necessary, reconstruct the packet. */
+#endif
+
+	debuglog("<%s> RA timer on %s is expired",
+	       __func__, rai->ifname);
+
+	ra_output(rai);
+
+	return(rai->timer);
+}
+
+/* update RA timer */
+void
+ra_timer_update(void *data, struct timeval *tm)
+{
+	struct rainfo *rai = (struct rainfo *)data;
+	long interval;
+
+	/*
+	 * Whenever a multicast advertisement is sent from an interface,
+	 * the timer is reset to a uniformly-distributed random value
+	 * between the interface's configured MinRtrAdvInterval and
+	 * MaxRtrAdvInterval (RFC2461 6.2.4).
+	 */
+	interval = rai->mininterval; 
+	interval += random() % (rai->maxinterval - rai->mininterval);
+
+	/*
+	 * The first advertisement is sent as soon as rtadvd starts up 
+	 * and for the next few advertisements (up to
+	 * MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen interval
+	 * is greater than MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer
+	 * SHOULD be set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead.
+	 * (RFC-2461 6.2.4)
+	 */
+	if (rai->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS &&
+	    interval > MAX_INITIAL_RTR_ADVERT_INTERVAL)
+		interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
+
+	tm->tv_sec = rai->initcounter == 0 ? 0 : interval;
+	tm->tv_usec = 0;
+
+	debuglog("<%s> RA timer on %s is set to %ld:%ld",
+	       __func__, rai->ifname,
+	       (long int)tm->tv_sec, (long int)tm->tv_usec);
+
+	return;
+}