arp(8) lookalike for IPv6, from KAME

1 files changed, 1082 insertions, 0 deletions

diff --git a/usr.sbin/ndp/ndp.c b/usr.sbin/ndp/ndp.c
new file mode 100644
index 00000000000..36ded8484f7
--- /dev/null
+++ b/usr.sbin/ndp/ndp.c
@@ -0,0 +1,1082 @@
+/*
+ * Copyright (C) 1995, 1996, 1997, 1998, and 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.
+ */
+/*
+ * Copyright (c) 1984, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Sun Microsystems, Inc.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+ */
+
+/*
+ * Based on:
+ * "@(#) Copyright (c) 1984, 1993\n\
+ *	The Regents of the University of California.  All rights reserved.\n";
+ *
+ * "@(#)arp.c	8.2 (Berkeley) 1/2/94";
+ */
+
+/*
+ * ndp - display, set, delete and flush neighbor cache
+ */
+
+
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+#include <sys/time.h>
+
+#include <net/if.h>
+#if defined(__FreeBSD__) && __FreeBSD__ >= 3
+#include <net/if_var.h>
+#endif /* __FreeBSD__ >= 3 */
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/route.h>
+
+#include <netinet/in.h>
+#ifndef __NetBSD__
+#include <netinet/if_ether.h>
+#endif
+
+#include <netinet/icmp6.h>
+#include <netinet6/in6_var.h>
+#include <netinet6/nd6.h>
+
+#include <arpa/inet.h>
+
+#include <netdb.h>
+#include <errno.h>
+#include <nlist.h>
+#include <stdio.h>
+#include <string.h>
+#include <paths.h>
+#include <err.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include "gmt2local.h"
+
+#ifndef NI_WITHSCOPEID
+#define NI_WITHSCOPEID	0
+#endif
+
+/* packing rule for routing socket */
+#define ROUNDUP(a) \
+	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
+#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
+
+extern int errno;
+static int pid;
+static int fflag;
+static int nflag;
+static int tflag;
+static int32_t thiszone;	/* time difference with gmt */
+static int s = -1;
+static int repeat = 0;
+static int lflag = 0;
+
+char ntop_buf[INET6_ADDRSTRLEN];	/* inet_ntop() */
+char host_buf[NI_MAXHOST];		/* getnameinfo() */
+char ifix_buf[IFNAMSIZ];		/* if_indextoname() */
+
+int main __P((int, char **));
+int file __P((char *));
+void getsocket __P((void));
+int set __P((int, char **));
+void get __P((char *));
+int delete __P((char *));
+void dump __P((struct in6_addr *));
+static struct in6_nbrinfo *getnbrinfo __P((struct in6_addr *addr,
+					   int ifindex, int));
+static char *ether_str __P((struct sockaddr_dl *));
+int ndp_ether_aton __P((char *, u_char *));
+void usage __P((void));
+int rtmsg __P((int));
+void ifinfo __P((char *));
+void rtrlist __P((void));
+void plist __P((void));
+void pfx_flush __P((void));
+void rtr_flush __P((void));
+void harmonize_rtr __P((void));
+#ifdef SIOCSDEFIFACE_IN6
+static void setdefif __P((char *));
+#endif
+static char *sec2str __P((time_t t));
+static char *ether_str __P((struct sockaddr_dl *sdl));
+static void ts_print __P((const struct timeval *));
+
+int
+main(argc, argv)
+	int argc;
+	char **argv;
+{
+	int ch;
+	int aflag = 0, cflag = 0, dflag = 0, sflag = 0, Hflag = 0,
+		pflag = 0, rflag = 0, Pflag = 0, Rflag = 0;
+	extern char *optarg;
+	extern int optind;
+
+	pid = getpid();
+	thiszone = gmt2local(0);
+	while ((ch = getopt(argc, argv, "acndfI:ilprstA:HPR")) != EOF)
+		switch ((char)ch) {
+		case 'a':
+			aflag = 1;
+			break;
+		case 'c':
+			fflag = 1;
+			cflag = 1;
+			break;
+		case 'd':
+			dflag = 1;
+			break;
+		case 'I':
+#ifdef SIOCSDEFIFACE_IN6
+			setdefif(optarg);
+			exit(0);
+#else
+			errx(1, "not supported yet");
+			/*NOTREACHED*/
+#endif
+		case 'i' :
+			if (argc != 3)
+				usage();
+			ifinfo(argv[2]);
+			exit(0);
+		case 'n':
+			nflag = 1;
+			continue;
+		case 'p':
+			pflag = 1;
+			break;
+		case 'f' :
+			if (argc != 3)
+				usage();
+			file(argv[2]);
+			exit(0);
+		case 'l' :
+			lflag = 1;
+			break;
+		case 'r' :
+			rflag = 1;
+			break;
+		case 's':
+			sflag = 1;
+			break;
+		case 't':
+			tflag = 1;
+			break;
+		case 'A':
+			aflag = 1;
+			repeat = atoi(optarg);
+			if (repeat < 0)
+				usage();
+			break;
+		case 'H' :
+			Hflag = 1;
+			break;
+		case 'P':
+			Pflag = 1;
+			break;
+		case 'R':
+			Rflag = 1;
+			break;
+		default:
+			usage();
+		}
+
+	argc -= optind;
+	argv += optind;
+
+	if (aflag || cflag) {
+		dump(0);
+		exit(0);
+	}
+	if (dflag) {
+		if (argc != 1)
+			usage();
+		delete(argv[0]);
+	}
+	if (pflag) {
+		plist();
+		exit(0);
+	}
+	if (rflag) {
+		rtrlist();
+		exit(0);
+	}
+	if (sflag) {
+		if (argc < 2 || argc > 4)
+			usage();
+		exit(set(argc, argv) ? 1 : 0);
+	}
+	if (Hflag) {
+		harmonize_rtr();
+		exit(0);
+	}
+	if (Pflag) {
+		pfx_flush();
+		exit(0);
+	}
+	if (Rflag) {
+		rtr_flush();
+		exit(0);
+	}
+
+	if (argc != 1)
+		usage();
+	get(argv[0]);
+	exit(0);
+}
+
+/*
+ * Process a file to set standard ndp entries
+ */
+int
+file(name)
+	char *name;
+{
+	FILE *fp;
+	int i, retval;
+	char line[100], arg[5][50], *args[5];
+
+	if ((fp = fopen(name, "r")) == NULL) {
+		fprintf(stderr, "ndp: cannot open %s\n", name);
+		exit(1);
+	}
+	args[0] = &arg[0][0];
+	args[1] = &arg[1][0];
+	args[2] = &arg[2][0];
+	args[3] = &arg[3][0];
+	args[4] = &arg[4][0];
+	retval = 0;
+	while(fgets(line, 100, fp) != NULL) {
+		i = sscanf(line, "%s %s %s %s %s", arg[0], arg[1], arg[2],
+		    arg[3], arg[4]);
+		if (i < 2) {
+			fprintf(stderr, "ndp: bad line: %s\n", line);
+			retval = 1;
+			continue;
+		}
+		if (set(i, args))
+			retval = 1;
+	}
+	fclose(fp);
+	return (retval);
+}
+
+void
+getsocket()
+{
+	if (s < 0) {
+		s = socket(PF_ROUTE, SOCK_RAW, 0);
+		if (s < 0) {
+			perror("ndp: socket");
+			exit(1);
+		}
+	}
+}
+
+struct	sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}};
+struct	sockaddr_in6 blank_sin = {sizeof(blank_sin), AF_INET6 }, sin_m;
+struct	sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m;
+int	expire_time, flags, found_entry;
+struct	{
+	struct	rt_msghdr m_rtm;
+	char	m_space[512];
+}	m_rtmsg;
+
+/*
+ * Set an individual neighbor cache entry
+ */
+int
+set(argc, argv)
+	int argc;
+	char **argv;
+{
+	register struct sockaddr_in6 *sin = &sin_m;
+	register struct sockaddr_dl *sdl;
+	register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
+	struct addrinfo hints, *res;
+	int gai_error;
+	u_char *ea;
+	char *host = argv[0], *eaddr = argv[1];
+
+	getsocket();
+	argc -= 2;
+	argv += 2;
+	sdl_m = blank_sdl;
+	sin_m = blank_sin;
+
+	bzero(&hints, sizeof(hints));
+	hints.ai_family = AF_INET6;
+	gai_error = getaddrinfo(host, NULL, &hints, &res);
+	if (gai_error) {
+		fprintf(stderr, "ndp: %s: %s\n", host,
+			gai_strerror(gai_error));
+		return 1;
+	}
+	sin->sin6_addr = ((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
+	ea = (u_char *)LLADDR(&sdl_m);
+	if (ndp_ether_aton(eaddr, ea) == 0)
+		sdl_m.sdl_alen = 6;
+	flags = expire_time = 0;
+	while (argc-- > 0) {
+		if (strncmp(argv[0], "temp", 4) == 0) {
+			struct timeval time;
+			gettimeofday(&time, 0);
+			expire_time = time.tv_sec + 20 * 60;
+		}
+		argv++;
+	}
+tryagain:
+	if (rtmsg(RTM_GET) < 0) {
+		perror(host);
+		return (1);
+	}
+	sin = (struct sockaddr_in6 *)(rtm + 1);
+	sdl = (struct sockaddr_dl *)(ROUNDUP(sin->sin6_len) + (char *)sin);
+	if (IN6_ARE_ADDR_EQUAL(&sin->sin6_addr, &sin_m.sin6_addr)) {
+		if (sdl->sdl_family == AF_LINK &&
+		    (rtm->rtm_flags & RTF_LLINFO) &&
+		    !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
+		case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
+		case IFT_ISO88024: case IFT_ISO88025:
+			goto overwrite;
+		}
+		goto tryagain;
+	}
+overwrite:
+	if (sdl->sdl_family != AF_LINK) {
+		printf("cannot intuit interface index and type for %s\n", host);
+		return (1);
+	}
+	sdl_m.sdl_type = sdl->sdl_type;
+	sdl_m.sdl_index = sdl->sdl_index;
+	return (rtmsg(RTM_ADD));
+}
+
+/*
+ * Display an individual neighbor cache entry
+ */
+void
+get(host)
+	char *host;
+{
+	struct sockaddr_in6 *sin = &sin_m;
+	struct addrinfo hints, *res;
+	int gai_error;
+
+	sin_m = blank_sin;
+	bzero(&hints, sizeof(hints));
+	hints.ai_family = AF_INET6;
+	gai_error = getaddrinfo(host, NULL, &hints, &res);
+	if (gai_error) {
+		fprintf(stderr, "ndp: %s: %s\n", host,
+			gai_strerror(gai_error));
+		return;
+	}
+	sin->sin6_addr = ((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
+	dump(&sin->sin6_addr);
+	if (found_entry == 0) {
+		getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf,
+			    sizeof(host_buf), NULL ,0,
+			    NI_WITHSCOPEID | (nflag ? NI_NUMERICHOST : 0));
+		printf("%s (%s) -- no entry\n", host, host_buf);
+		exit(1);
+	}
+}
+
+/*
+ * Delete a neighbor cache entry
+ */
+int
+delete(host)
+	char *host;
+{
+	struct sockaddr_in6 *sin = &sin_m;
+	register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
+	struct sockaddr_dl *sdl;
+	struct addrinfo hints, *res;
+	int gai_error;
+
+	getsocket();
+	sin_m = blank_sin;
+
+	bzero(&hints, sizeof(hints));
+	hints.ai_family = AF_INET6;
+	gai_error = getaddrinfo(host, NULL, &hints, &res);
+	if (gai_error) {
+		fprintf(stderr, "ndp: %s: %s\n", host,
+			gai_strerror(gai_error));
+		return 1;
+	}
+	sin->sin6_addr = ((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
+/*tryagain:*/
+	if (rtmsg(RTM_GET) < 0) {
+		perror(host);
+		return (1);
+	}
+	sin = (struct sockaddr_in6 *)(rtm + 1);
+	sdl = (struct sockaddr_dl *)(ROUNDUP(sin->sin6_len) + (char *)sin);
+	if (IN6_ARE_ADDR_EQUAL(&sin->sin6_addr, &sin_m.sin6_addr)) {
+		if (sdl->sdl_family == AF_LINK &&
+		    (rtm->rtm_flags & RTF_LLINFO) &&
+		    !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
+		case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
+		case IFT_ISO88024: case IFT_ISO88025:
+			goto delete;
+		}
+	}
+delete:
+	if (sdl->sdl_family != AF_LINK) {
+		printf("cannot locate %s\n", host);
+		return (1);
+	}
+	if (rtmsg(RTM_DELETE) == 0) {
+	       getnameinfo((struct sockaddr *)sin, 
+			   sin->sin6_len, host_buf,
+			   sizeof(host_buf), NULL, 0,
+			   NI_WITHSCOPEID | (nflag ? NI_NUMERICHOST : 0));
+		printf("%s (%s) deleted\n", host, host_buf);
+	}
+
+	return 0;
+}
+
+/*
+ * Dump the entire neighbor cache
+ */
+void
+dump(addr)
+	struct in6_addr *addr;
+{
+	int mib[6];
+	size_t needed;
+	char *lim, *buf, *next;
+	struct rt_msghdr *rtm;
+	struct sockaddr_in6 *sin;
+	struct sockaddr_dl *sdl;
+	extern int h_errno;
+	struct in6_nbrinfo *nbi;
+	struct timeval time;
+	int addrwidth;
+	char flgbuf[8];
+
+	/* Print header */
+	if (!tflag)
+		printf("%-31.31s %-17.17s %6.6s %-9.9s %2s %4s %4s\n",
+		       "Neighbor", "Linklayer Address", "Netif", "Expire",
+		       "St", "Flgs", "Prbs");
+
+again:;
+	mib[0] = CTL_NET;
+	mib[1] = PF_ROUTE;
+	mib[2] = 0;
+	mib[3] = AF_INET6;
+	mib[4] = NET_RT_FLAGS;
+	mib[5] = RTF_LLINFO;
+	if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
+		err(1, "sysctl(PF_ROUTE estimate)");
+	if (needed > 0) {
+		if ((buf = malloc(needed)) == NULL)
+			errx(1, "malloc");
+		if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
+			err(1, "sysctl(PF_ROUTE, NET_RT_FLAGS)");
+		lim = buf + needed;
+	} else
+		buf = lim = NULL;
+
+	for (next = buf; next && next < lim; next += rtm->rtm_msglen) {
+		int isrouter = 0, prbs = 0;
+
+		rtm = (struct rt_msghdr *)next;
+		sin = (struct sockaddr_in6 *)(rtm + 1);
+		sdl = (struct sockaddr_dl *)((char *)sin + ROUNDUP(sin->sin6_len));
+		if (addr) {
+			if (!IN6_ARE_ADDR_EQUAL(addr, &sin->sin6_addr))
+				continue;
+			found_entry = 1;
+		} else if (IN6_IS_ADDR_MULTICAST(&sin->sin6_addr))
+			continue;
+		if (fflag == 1) {
+			delete((char *)inet_ntop(AF_INET6, &sin->sin6_addr,
+						 ntop_buf, sizeof(ntop_buf)));
+			continue;
+		}
+
+		if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) ||
+		    IN6_IS_ADDR_MC_LINKLOCAL(&sin->sin6_addr)) {
+			/* XXX: should scope id be filled in the kernel? */
+			if (sin->sin6_scope_id == 0)
+				sin->sin6_scope_id = sdl->sdl_index;
+
+			/* XXX: KAME specific hack; removed the embedded id */
+			*(u_int16_t *)&sin->sin6_addr.s6_addr[2] = 0;
+		}
+		getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf,
+			    sizeof(host_buf), NULL, 0,
+			    NI_WITHSCOPEID | (nflag ? NI_NUMERICHOST : 0));
+		gettimeofday(&time, 0);
+		if (tflag)
+			ts_print(&time);
+
+		if (lflag) {
+			addrwidth = strlen(host_buf);
+			if (addrwidth < 31)
+				addrwidth = 31;
+		} else
+			addrwidth = 31;
+
+		printf("%-*.*s %-17.17s %6.6s", addrwidth, addrwidth, host_buf,
+		       ether_str(sdl),
+		       if_indextoname(sdl->sdl_index, ifix_buf));
+
+		/* Print neighbor discovery specific informations */
+		nbi = getnbrinfo(&sin->sin6_addr, sdl->sdl_index, 1);
+		if (nbi) {
+			if (nbi->expire > time.tv_sec) {
+				printf(" %-9.9s",
+				       sec2str(nbi->expire - time.tv_sec));
+			}
+			else if (nbi->expire == 0)
+				printf(" %-9.9s", "permanent");
+			else
+				printf(" %-9.9s", "expired");
+
+			switch(nbi->state) {
+			 case ND6_LLINFO_NOSTATE:
+				 printf(" N");
+				 break;
+			 case ND6_LLINFO_WAITDELETE:
+				 printf(" W");
+				 break;
+			 case ND6_LLINFO_INCOMPLETE:
+				 printf(" I");
+				 break;
+			 case ND6_LLINFO_REACHABLE:
+				 printf(" R");
+				 break;
+			 case ND6_LLINFO_STALE:
+				 printf(" S");
+				 break;
+			 case ND6_LLINFO_DELAY:
+				 printf(" D");
+				 break;
+			 case ND6_LLINFO_PROBE:
+				 printf(" P");
+				 break;
+			 default:
+				 printf(" ?");
+				 break;
+			}
+
+			isrouter = nbi->isrouter;
+			prbs = nbi->asked;
+		}
+		else {
+			warnx("failed to get neighbor information");
+			printf("  ");
+		}
+		putchar(' ');
+
+		/*
+		 * other flags. R: router, P: proxy, W: ??
+		 */
+		if ((rtm->rtm_addrs & RTA_NETMASK) == 0) {
+			snprintf(flgbuf, sizeof(flgbuf), "%s",
+				isrouter ? "R" : "");
+		} else {
+			sin = (struct sockaddr_in6 *)
+				(sdl->sdl_len + (char *)sdl);
+			snprintf(flgbuf, sizeof(flgbuf), "%s%s%s",
+				isrouter ? "R" : "",
+				!IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr)
+					? "P" : "",
+				(sin->sin6_len != sizeof(struct sockaddr_in6))
+					? "W" : "");
+		}
+		printf(" %-4.4s", flgbuf);
+
+		if (prbs)
+			printf(" %4d", prbs);
+
+		printf("\n");
+	}
+
+	if (repeat) {
+		printf("\n");
+		sleep(repeat);
+		goto again;
+	}
+}
+
+static struct in6_nbrinfo *
+getnbrinfo(addr, ifindex, warning)
+	struct in6_addr *addr;
+	int ifindex;
+	int warning;
+{
+	static struct in6_nbrinfo nbi;
+	int s;
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
+		err(1, "socket");
+
+	bzero(&nbi, sizeof(nbi));
+	if_indextoname(ifindex, nbi.ifname);
+	nbi.addr = *addr;
+	if (ioctl(s, SIOCGNBRINFO_IN6, (caddr_t)&nbi) < 0) {
+		if (warning)
+			warn("ioctl");
+		close(s);
+		return(NULL);
+	}
+
+	close(s);
+	return(&nbi);
+}
+
+static char *
+ether_str(sdl)
+	struct sockaddr_dl *sdl;
+{
+	static char ebuf[32];
+	u_char *cp;
+
+	if (sdl->sdl_alen) {
+		cp = (u_char *)LLADDR(sdl);
+		sprintf(ebuf, "%x:%x:%x:%x:%x:%x",
+			cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
+	}
+	else {
+		sprintf(ebuf, "(incomplete)");
+	}
+
+	return(ebuf);
+}
+
+int
+ndp_ether_aton(a, n)
+	char *a;
+	u_char *n;
+{
+	int i, o[6];
+
+	i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2],
+					   &o[3], &o[4], &o[5]);
+	if (i != 6) {
+		fprintf(stderr, "ndp: invalid Ethernet address '%s'\n", a);
+		return (1);
+	}
+	for (i=0; i<6; i++)
+		n[i] = o[i];
+	return (0);
+}
+
+void
+usage()
+{
+	printf("usage: ndp hostname\n");
+	printf("       ndp -a[ntl]\n");
+	printf("       ndp [-ntl] -A wait\n");
+	printf("       ndp -c[nt]\n");
+	printf("       ndp -d[nt] hostname\n");
+	printf("       ndp -f[nt] filename\n");
+	printf("       ndp -i interface\n");
+#ifdef SIOCSDEFIFACE_IN6
+	printf("       ndp -I interface\n");
+#endif
+	printf("       ndp -p\n");
+	printf("       ndp -r\n");
+	printf("       ndp -s hostname ether_addr [temp]\n");
+	printf("       ndp -H\n");
+	printf("       ndp -P\n");
+	printf("       ndp -R\n");
+	exit(1);
+}
+
+int
+rtmsg(cmd)
+	int cmd;
+{
+	static int seq;
+	int rlen;
+	register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
+	register char *cp = m_rtmsg.m_space;
+	register int l;
+
+	errno = 0;
+	if (cmd == RTM_DELETE)
+		goto doit;
+	bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
+	rtm->rtm_flags = flags;
+	rtm->rtm_version = RTM_VERSION;
+
+	switch (cmd) {
+	default:
+		fprintf(stderr, "ndp: internal wrong cmd\n");
+		exit(1);
+	case RTM_ADD:
+		rtm->rtm_addrs |= RTA_GATEWAY;
+		rtm->rtm_rmx.rmx_expire = expire_time;
+		rtm->rtm_inits = RTV_EXPIRE;
+		rtm->rtm_flags |= (RTF_HOST | RTF_STATIC);
+		/* FALLTHROUGH */
+	case RTM_GET:
+		rtm->rtm_addrs |= RTA_DST;
+	}
+#define NEXTADDR(w, s) \
+	if (rtm->rtm_addrs & (w)) { \
+		bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}
+
+	NEXTADDR(RTA_DST, sin_m);
+	NEXTADDR(RTA_GATEWAY, sdl_m);
+	NEXTADDR(RTA_NETMASK, so_mask);
+
+	rtm->rtm_msglen = cp - (char *)&m_rtmsg;
+doit:
+	l = rtm->rtm_msglen;
+	rtm->rtm_seq = ++seq;
+	rtm->rtm_type = cmd;
+	if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
+		if (errno != ESRCH || cmd != RTM_DELETE) {
+			perror("writing to routing socket");
+			return (-1);
+		}
+	}
+	do {
+		l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
+	} while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid));
+	if (l < 0)
+		(void) fprintf(stderr, "ndp: read from routing socket: %s\n",
+		    strerror(errno));
+	return (0);
+}
+
+void
+ifinfo(ifname)
+	char *ifname;
+{
+	struct in6_ndireq nd;
+	int s;
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+		perror("ndp: socket");
+		exit(1);
+	}
+	bzero(&nd, sizeof(nd));
+	strcpy(nd.ifname, ifname);
+	if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
+ 		perror("ioctl (SIOCGIFINFO_IN6)");
+ 		exit(1);
+ 	}
+#define ND nd.ndi
+	printf("linkmtu=%d", ND.linkmtu);
+	printf(", curhlim=%d", ND.chlim);
+	printf(", basereachable=%ds%dms",
+	       ND.basereachable / 1000, ND.basereachable % 1000);
+	printf(", reachable=%ds", ND.reachable);
+	printf(", retrans=%ds%dms\n", ND.retrans / 1000, ND.retrans % 1000);
+#undef ND
+	close(s);
+}
+
+void
+rtrlist()
+{
+	struct in6_drlist dr;
+	int s, i;
+	struct timeval time;
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+		perror("ndp: socket");
+		exit(1);
+	}
+	bzero(&dr, sizeof(dr));
+	strcpy(dr.ifname, "lo0"); /* dummy */
+	if (ioctl(s, SIOCGDRLST_IN6, (caddr_t)&dr) < 0) {
+ 		perror("ioctl (SIOCGDRLST_IN6)");
+ 		exit(1);
+ 	}
+#define DR dr.defrouter[i]
+	for (i = 0 ; DR.if_index && i < PRLSTSIZ ; i++) {
+		struct sockaddr_in6 sin6;
+
+		bzero(&sin6, sizeof(sin6));
+		sin6.sin6_family = AF_INET6;
+		sin6.sin6_len = sizeof(sin6);
+		sin6.sin6_addr = DR.rtaddr;
+		getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len, host_buf,
+			    sizeof(host_buf), NULL, 0,
+			    NI_WITHSCOPEID | (nflag ? NI_NUMERICHOST : 0));
+		
+		printf("%s if=%s", host_buf,
+		       if_indextoname(DR.if_index, ifix_buf));
+		printf(", flags=%s%s",
+		       DR.flags & ND_RA_FLAG_MANAGED ? "M" : "",
+		       DR.flags & ND_RA_FLAG_OTHER   ? "O" : "");
+		gettimeofday(&time, 0);
+		if (DR.expire == 0)
+			printf(", expire=Never\n");
+		else
+			printf(", expire=%s\n",
+				sec2str(DR.expire - time.tv_sec));
+	}
+#undef DR
+	close(s);
+}
+
+void
+plist()
+{
+	struct in6_prlist pr;
+	int s, i;
+	struct timeval time;
+
+	gettimeofday(&time, 0);
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+		perror("ndp: socket");
+		exit(1);
+	}
+	bzero(&pr, sizeof(pr));
+	strcpy(pr.ifname, "lo0"); /* dummy */
+	if (ioctl(s, SIOCGPRLST_IN6, (caddr_t)&pr) < 0) {
+ 		perror("ioctl (SIOCGPRLST_IN6)");
+ 		exit(1);
+ 	}
+#define PR pr.prefix[i]
+	for (i = 0; PR.if_index && i < PRLSTSIZ ; i++) {
+		printf("%s/%d if=%s\n",
+		       inet_ntop(AF_INET6, &PR.prefix, ntop_buf,
+				 sizeof(ntop_buf)), PR.prefixlen,
+		       if_indextoname(PR.if_index, ifix_buf));
+		gettimeofday(&time, 0);
+		printf("  flags=%s%s",
+		       PR.raflags.onlink ? "L" : "",
+		       PR.raflags.autonomous ? "A" : "");
+		if (PR.vltime == ND6_INFINITE_LIFETIME)
+			printf(" vltime=infinity");
+		else
+			printf(" vltime=%ld", (long)PR.vltime);
+		if (PR.pltime == ND6_INFINITE_LIFETIME)
+			printf(", pltime=infinity");
+		else
+			printf(", pltime=%ld", (long)PR.pltime);
+		if (PR.expire == 0)
+			printf(", expire=Never\n");
+		else if (PR.expire >= time.tv_sec)
+			printf(", expire=%s\n",
+				sec2str(PR.expire - time.tv_sec));
+		else
+			printf(", expired\n");
+		if (PR.advrtrs) {
+			int j;
+			printf("  advertised by\n");
+			for (j = 0; j < PR.advrtrs; j++) {
+				struct sockaddr_in6 sin6;
+				struct in6_nbrinfo *nbi;
+
+				bzero(&sin6, sizeof(sin6));
+				sin6.sin6_family = AF_INET6;
+				sin6.sin6_len = sizeof(sin6);
+				sin6.sin6_addr = PR.advrtr[j];
+				sin6.sin6_scope_id = PR.if_index; /* XXX */
+				getnameinfo((struct sockaddr *)&sin6,
+					    sin6.sin6_len, host_buf,
+					    sizeof(host_buf), NULL, 0,
+					    NI_WITHSCOPEID | (nflag ? NI_NUMERICHOST : 0));
+				printf("    %s", host_buf);
+
+				nbi = getnbrinfo(&sin6.sin6_addr, PR.if_index,
+						 0);
+				if (nbi) {
+					switch(nbi->state) {
+					 case ND6_LLINFO_REACHABLE:
+					 case ND6_LLINFO_STALE:
+					 case ND6_LLINFO_DELAY:
+					 case ND6_LLINFO_PROBE:
+						 printf(" (reachable)\n");
+						 break;
+					 default:
+						 printf(" (unreachable)\n"); 
+					}
+				}
+				else
+					printf(" (no neighbor state)\n");
+			}
+			if (PR.advrtrs > DRLSTSIZ)
+				printf("    and %d routers\n",
+				       PR.advrtrs - DRLSTSIZ);
+		}
+		else
+			printf("  No advertising router\n");
+	}
+#undef PR
+	close(s);
+}
+
+void
+pfx_flush()
+{
+	char dummyif[IFNAMSIZ+8];
+	int s;
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
+		err(1, "socket");
+	strcpy(dummyif, "lo0"); /* dummy */
+	if (ioctl(s, SIOCSPFXFLUSH_IN6, (caddr_t)&dummyif) < 0)
+ 		err(1, "ioctl(SIOCSPFXFLUSH_IN6)");
+}
+
+void
+rtr_flush()
+{
+	char dummyif[IFNAMSIZ+8];
+	int s;
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
+		err(1, "socket");
+	strcpy(dummyif, "lo0"); /* dummy */
+	if (ioctl(s, SIOCSRTRFLUSH_IN6, (caddr_t)&dummyif) < 0)
+ 		err(1, "ioctl(SIOCSRTRFLUSH_IN6)");
+
+	close(s);
+}
+
+void
+harmonize_rtr()
+{
+	char dummyif[IFNAMSIZ+8];
+	int s;
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
+		err(1, "ndp: socket");
+	strcpy(dummyif, "lo0"); /* dummy */
+	if (ioctl(s, SIOCSNDFLUSH_IN6, (caddr_t)&dummyif) < 0)
+ 		err(1, "ioctl (SIOCSNDFLUSH_IN6)");
+
+	close(s);
+}
+
+#ifdef SIOCSDEFIFACE_IN6
+static void
+setdefif(ifname)
+	char *ifname;
+{
+	int s;
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) 
+		err(1, "ndp: socket");
+
+	if (ioctl(s, SIOCSDEFIFACE_IN6, (caddr_t)ifname) < 0)
+ 		err(1, "ioctl (SIOCSDEFIFACE_IN6)");
+
+	close(s);
+}
+#endif
+
+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);
+}
+
+/*
+ * Print the timestamp
+ * from tcpdump/util.c
+ */
+static void
+ts_print(tvp)
+	const struct timeval *tvp;
+{
+	int s;
+
+	/* Default */
+	s = (tvp->tv_sec + thiszone) % 86400;
+	(void)printf("%02d:%02d:%02d.%06u ",
+	    s / 3600, (s % 3600) / 60, s % 60, (u_int32_t)tvp->tv_usec);
+}