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freebsd-dev/usr.sbin/ndp/ndp.c
Alexander V. Chernikov 4a336ef40c rtsock requests for deleting interface address lles started to return EPERM 
instead of old "ignore-and-return 0" in r287789. This broke arp -da /
  ndp -cn behavior (they exit on rtsock command failure). Fix this by
  translating LLE_IFADDR to RTM_PINNED flag, passing it to userland and
  making arp/ndp ignore these entries in batched delete.

MFC after:	2 weeks
2015-09-27 04:54:29 +00:00

1382 lines
33 KiB
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/* $FreeBSD$ */
/* $KAME: ndp.c,v 1.104 2003/06/27 07:48:39 itojun Exp $ */
/*
* 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.
* 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 <sys/queue.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/icmp6.h>
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#include <arpa/inet.h>
#include <ctype.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"
#define NEXTADDR(w, s) \
if (rtm->rtm_addrs & (w)) { \
bcopy((char *)&s, cp, sizeof(s)); cp += SA_SIZE(&s);}
static pid_t pid;
static int nflag;
static int tflag;
static int32_t thiszone; /* time difference with gmt */
static int s = -1;
static int repeat = 0;
static char host_buf[NI_MAXHOST]; /* getnameinfo() */
static char ifix_buf[IFNAMSIZ]; /* if_indextoname() */
static int file(char *);
static void getsocket(void);
static int set(int, char **);
static void get(char *);
static int delete(char *);
static void dump(struct sockaddr_in6 *, int);
static struct in6_nbrinfo *getnbrinfo(struct in6_addr *, int, int);
static char *ether_str(struct sockaddr_dl *);
static int ndp_ether_aton(char *, u_char *);
static void usage(void);
static int rtmsg(int);
static void ifinfo(char *, int, char **);
static void rtrlist(void);
static void plist(void);
static void pfx_flush(void);
static void rtr_flush(void);
static void harmonize_rtr(void);
#ifdef SIOCSDEFIFACE_IN6 /* XXX: check SIOCGDEFIFACE_IN6 as well? */
static void getdefif(void);
static void setdefif(char *);
#endif
static char *sec2str(time_t);
static void ts_print(const struct timeval *);
static char *rtpref_str[] = {
"medium", /* 00 */
"high", /* 01 */
"rsv", /* 10 */
"low" /* 11 */
};
int
main(int argc, char **argv)
{
int ch, mode = 0;
char *arg = NULL;
pid = getpid();
thiszone = gmt2local(0);
while ((ch = getopt(argc, argv, "acd:f:Ii:nprstA:HPR")) != -1)
switch (ch) {
case 'a':
case 'c':
case 'p':
case 'r':
case 'H':
case 'P':
case 'R':
case 's':
case 'I':
if (mode) {
usage();
/*NOTREACHED*/
}
mode = ch;
arg = NULL;
break;
case 'f':
exit(file(optarg) ? 1 : 0);
case 'd':
case 'i':
if (mode) {
usage();
/*NOTREACHED*/
}
mode = ch;
arg = optarg;
break;
case 'n':
nflag = 1;
break;
case 't':
tflag = 1;
break;
case 'A':
if (mode) {
usage();
/*NOTREACHED*/
}
mode = 'a';
repeat = atoi(optarg);
if (repeat < 0) {
usage();
/*NOTREACHED*/
}
break;
default:
usage();
}
argc -= optind;
argv += optind;
switch (mode) {
case 'a':
case 'c':
if (argc != 0) {
usage();
/*NOTREACHED*/
}
dump(0, mode == 'c');
break;
case 'd':
if (argc != 0) {
usage();
/*NOTREACHED*/
}
delete(arg);
break;
case 'I':
#ifdef SIOCSDEFIFACE_IN6 /* XXX: check SIOCGDEFIFACE_IN6 as well? */
if (argc > 1) {
usage();
/*NOTREACHED*/
} else if (argc == 1) {
if (strcmp(*argv, "delete") == 0 ||
if_nametoindex(*argv))
setdefif(*argv);
else
errx(1, "invalid interface %s", *argv);
}
getdefif(); /* always call it to print the result */
break;
#else
errx(1, "not supported yet");
/*NOTREACHED*/
#endif
case 'p':
if (argc != 0) {
usage();
/*NOTREACHED*/
}
plist();
break;
case 'i':
ifinfo(arg, argc, argv);
break;
case 'r':
if (argc != 0) {
usage();
/*NOTREACHED*/
}
rtrlist();
break;
case 's':
if (argc < 2 || argc > 4)
usage();
exit(set(argc, argv) ? 1 : 0);
case 'H':
if (argc != 0) {
usage();
/*NOTREACHED*/
}
harmonize_rtr();
break;
case 'P':
if (argc != 0) {
usage();
/*NOTREACHED*/
}
pfx_flush();
break;
case 'R':
if (argc != 0) {
usage();
/*NOTREACHED*/
}
rtr_flush();
break;
case 0:
if (argc != 1) {
usage();
/*NOTREACHED*/
}
get(argv[0]);
break;
}
exit(0);
}
/*
* Process a file to set standard ndp entries
*/
static int
file(char *name)
{
FILE *fp;
int i, retval;
char line[100], arg[5][50], *args[5], *p;
if ((fp = fopen(name, "r")) == NULL)
err(1, "cannot open %s", name);
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, sizeof(line), fp) != NULL) {
if ((p = strchr(line, '#')) != NULL)
*p = '\0';
for (p = line; isblank(*p); p++);
if (*p == '\n' || *p == '\0')
continue;
i = sscanf(line, "%49s %49s %49s %49s %49s",
arg[0], arg[1], arg[2], arg[3], arg[4]);
if (i < 2) {
warnx("bad line: %s", line);
retval = 1;
continue;
}
if (set(i, args))
retval = 1;
}
fclose(fp);
return (retval);
}
static void
getsocket()
{
if (s < 0) {
s = socket(PF_ROUTE, SOCK_RAW, 0);
if (s < 0) {
err(1, "socket");
/* NOTREACHED */
}
}
}
static struct sockaddr_in6 so_mask = {
.sin6_len = sizeof(so_mask),
.sin6_family = AF_INET6
};
static struct sockaddr_in6 blank_sin = {
.sin6_len = sizeof(blank_sin),
.sin6_family = AF_INET6
};
static struct sockaddr_in6 sin_m;
static struct sockaddr_dl blank_sdl = {
.sdl_len = sizeof(blank_sdl),
.sdl_family = AF_LINK
};
static struct sockaddr_dl sdl_m;
static time_t expire_time;
static int flags, found_entry;
static struct {
struct rt_msghdr m_rtm;
char m_space[512];
} m_rtmsg;
/*
* Set an individual neighbor cache entry
*/
static int
set(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;
sin->sin6_scope_id =
((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id;
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 now;
gettimeofday(&now, 0);
expire_time = now.tv_sec + 20 * 60;
} else if (strncmp(argv[0], "proxy", 5) == 0)
flags |= RTF_ANNOUNCE;
argv++;
}
if (rtmsg(RTM_GET) < 0) {
errx(1, "RTM_GET(%s) failed", host);
/* NOTREACHED */
}
sin = (struct sockaddr_in6 *)(rtm + 1);
sdl = (struct sockaddr_dl *)(ALIGN(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_GATEWAY)) {
switch (sdl->sdl_type) {
case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
case IFT_ISO88024: case IFT_ISO88025:
case IFT_L2VLAN: case IFT_BRIDGE:
goto overwrite;
}
}
fprintf(stderr, "set: cannot configure a new entry\n");
return 1;
}
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
*/
static void
get(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;
sin->sin6_scope_id =
((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id;
dump(sin, 0);
if (found_entry == 0) {
getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf,
sizeof(host_buf), NULL ,0,
(nflag ? NI_NUMERICHOST : 0));
printf("%s (%s) -- no entry\n", host, host_buf);
exit(1);
}
}
/*
* Delete a neighbor cache entry
*/
static int
delete(char *host)
{
struct sockaddr_in6 *sin = &sin_m;
register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
register char *cp = m_rtmsg.m_space;
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;
sin->sin6_scope_id =
((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id;
if (rtmsg(RTM_GET) < 0) {
errx(1, "RTM_GET(%s) failed", host);
/* NOTREACHED */
}
sin = (struct sockaddr_in6 *)(rtm + 1);
sdl = (struct sockaddr_dl *)(ALIGN(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_GATEWAY)) {
goto delete;
}
fprintf(stderr, "delete: cannot delete non-NDP entry\n");
return 1;
}
delete:
if (sdl->sdl_family != AF_LINK) {
printf("cannot locate %s\n", host);
return (1);
}
/*
* need to reinit the field because it has rt_key
* but we want the actual address
*/
NEXTADDR(RTA_DST, sin_m);
rtm->rtm_flags |= RTF_LLDATA;
if (rtmsg(RTM_DELETE) == 0) {
getnameinfo((struct sockaddr *)sin,
sin->sin6_len, host_buf,
sizeof(host_buf), NULL, 0,
(nflag ? NI_NUMERICHOST : 0));
printf("%s (%s) deleted\n", host, host_buf);
}
return 0;
}
#define W_ADDR 36
#define W_LL 17
#define W_IF 6
/*
* Dump the entire neighbor cache
*/
static void
dump(struct sockaddr_in6 *addr, int cflag)
{
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 now;
int addrwidth;
int llwidth;
int ifwidth;
char flgbuf[8];
char *ifname;
/* Print header */
if (!tflag && !cflag)
printf("%-*.*s %-*.*s %*.*s %-9.9s %1s %5s\n",
W_ADDR, W_ADDR, "Neighbor", W_LL, W_LL, "Linklayer Address",
W_IF, W_IF, "Netif", "Expire", "S", "Flags");
again:;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = AF_INET6;
mib[4] = NET_RT_FLAGS;
#ifdef RTF_LLINFO
mib[5] = RTF_LLINFO;
#else
mib[5] = 0;
#endif
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
err(1, "sysctl(PF_ROUTE estimate)");
if (needed > 0) {
if ((buf = malloc(needed)) == NULL)
err(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 + ALIGN(sin->sin6_len));
/*
* Some OSes can produce a route that has the LINK flag but
* has a non-AF_LINK gateway (e.g. fe80::xx%lo0 on FreeBSD
* and BSD/OS, where xx is not the interface identifier on
* lo0). Such routes entry would annoy getnbrinfo() below,
* so we skip them.
* XXX: such routes should have the GATEWAY flag, not the
* LINK flag. However, there is rotten routing software
* that advertises all routes that have the GATEWAY flag.
* Thus, KAME kernel intentionally does not set the LINK flag.
* What is to be fixed is not ndp, but such routing software
* (and the kernel workaround)...
*/
if (sdl->sdl_family != AF_LINK)
continue;
if (!(rtm->rtm_flags & RTF_HOST))
continue;
if (addr) {
if (IN6_ARE_ADDR_EQUAL(&addr->sin6_addr,
&sin->sin6_addr) == 0 ||
addr->sin6_scope_id != sin->sin6_scope_id)
continue;
found_entry = 1;
} else if (IN6_IS_ADDR_MULTICAST(&sin->sin6_addr))
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;
}
getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf,
sizeof(host_buf), NULL, 0, (nflag ? NI_NUMERICHOST : 0));
if (cflag) {
#ifdef RTF_WASCLONED
if (rtm->rtm_flags & RTF_WASCLONED)
delete(host_buf);
#elif defined(RTF_CLONED)
if (rtm->rtm_flags & RTF_CLONED)
delete(host_buf);
#else
if (rtm->rtm_flags & RTF_PINNED)
continue;
delete(host_buf);
#endif
continue;
}
gettimeofday(&now, 0);
if (tflag)
ts_print(&now);
addrwidth = strlen(host_buf);
if (addrwidth < W_ADDR)
addrwidth = W_ADDR;
llwidth = strlen(ether_str(sdl));
if (W_ADDR + W_LL - addrwidth > llwidth)
llwidth = W_ADDR + W_LL - addrwidth;
ifname = if_indextoname(sdl->sdl_index, ifix_buf);
if (!ifname)
ifname = "?";
ifwidth = strlen(ifname);
if (W_ADDR + W_LL + W_IF - addrwidth - llwidth > ifwidth)
ifwidth = W_ADDR + W_LL + W_IF - addrwidth - llwidth;
printf("%-*.*s %-*.*s %*.*s", addrwidth, addrwidth, host_buf,
llwidth, llwidth, ether_str(sdl), ifwidth, ifwidth, ifname);
/* Print neighbor discovery specific informations */
nbi = getnbrinfo(&sin->sin6_addr, sdl->sdl_index, 1);
if (nbi) {
if (nbi->expire > now.tv_sec) {
printf(" %-9.9s",
sec2str(nbi->expire - now.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;
#ifdef ND6_LLINFO_WAITDELETE
case ND6_LLINFO_WAITDELETE:
printf(" W");
break;
#endif
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(" ");
}
/*
* other flags. R: router, P: proxy, W: ??
*/
if ((rtm->rtm_addrs & RTA_NETMASK) == 0) {
snprintf(flgbuf, sizeof(flgbuf), "%s%s",
isrouter ? "R" : "",
(rtm->rtm_flags & RTF_ANNOUNCE) ? "p" : "");
} else {
#if 0 /* W and P are mystery even for us */
sin = (struct sockaddr_in6 *)
(sdl->sdl_len + (char *)sdl);
snprintf(flgbuf, sizeof(flgbuf), "%s%s%s%s",
isrouter ? "R" : "",
!IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr) ? "P" : "",
(sin->sin6_len != sizeof(struct sockaddr_in6)) ? "W" : "",
(rtm->rtm_flags & RTF_ANNOUNCE) ? "p" : "");
#else
snprintf(flgbuf, sizeof(flgbuf), "%s%s",
isrouter ? "R" : "",
(rtm->rtm_flags & RTF_ANNOUNCE) ? "p" : "");
#endif
}
printf(" %s", flgbuf);
if (prbs)
printf(" %d", prbs);
printf("\n");
}
if (buf != NULL)
free(buf);
if (repeat) {
printf("\n");
fflush(stdout);
sleep(repeat);
goto again;
}
}
static struct in6_nbrinfo *
getnbrinfo(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(SIOCGNBRINFO_IN6)");
close(s);
return(NULL);
}
close(s);
return(&nbi);
}
static char *
ether_str(struct sockaddr_dl *sdl)
{
static char hbuf[NI_MAXHOST];
if (sdl->sdl_alen == ETHER_ADDR_LEN) {
strlcpy(hbuf, ether_ntoa((struct ether_addr *)LLADDR(sdl)),
sizeof(hbuf));
} else if (sdl->sdl_alen) {
int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0;
snprintf(hbuf, sizeof(hbuf), "%s", link_ntoa(sdl) + n);
} else
snprintf(hbuf, sizeof(hbuf), "(incomplete)");
return(hbuf);
}
static int
ndp_ether_aton(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);
}
static void
usage()
{
printf("usage: ndp [-nt] hostname\n");
printf(" ndp [-nt] -a | -c | -p | -r | -H | -P | -R\n");
printf(" ndp [-nt] -A wait\n");
printf(" ndp [-nt] -d hostname\n");
printf(" ndp [-nt] -f filename\n");
printf(" ndp [-nt] -i interface [flags...]\n");
#ifdef SIOCSDEFIFACE_IN6
printf(" ndp [-nt] -I [interface|delete]\n");
#endif
printf(" ndp [-nt] -s nodename etheraddr [temp] [proxy]\n");
exit(1);
}
static int
rtmsg(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;
if (expire_time) {
rtm->rtm_rmx.rmx_expire = expire_time;
rtm->rtm_inits = RTV_EXPIRE;
}
rtm->rtm_flags |= (RTF_HOST | RTF_STATIC | RTF_LLDATA);
#if 0 /* we don't support ipv6addr/128 type proxying */
if (rtm->rtm_flags & RTF_ANNOUNCE) {
rtm->rtm_flags &= ~RTF_HOST;
rtm->rtm_addrs |= RTA_NETMASK;
}
#endif
/* FALLTHROUGH */
case RTM_GET:
rtm->rtm_addrs |= RTA_DST;
}
NEXTADDR(RTA_DST, sin_m);
NEXTADDR(RTA_GATEWAY, sdl_m);
#if 0 /* we don't support ipv6addr/128 type proxying */
memset(&so_mask.sin6_addr, 0xff, sizeof(so_mask.sin6_addr));
NEXTADDR(RTA_NETMASK, so_mask);
#endif
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) {
err(1, "writing to routing socket");
/* NOTREACHED */
}
}
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);
}
static void
ifinfo(char *ifname, int argc, char **argv)
{
struct in6_ndireq nd;
int i, s;
u_int32_t newflags;
#ifdef IPV6CTL_USETEMPADDR
u_int8_t nullbuf[8];
#endif
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
err(1, "socket");
/* NOTREACHED */
}
bzero(&nd, sizeof(nd));
strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
err(1, "ioctl(SIOCGIFINFO_IN6)");
/* NOTREACHED */
}
#define ND nd.ndi
newflags = ND.flags;
for (i = 0; i < argc; i++) {
int clear = 0;
char *cp = argv[i];
if (*cp == '-') {
clear = 1;
cp++;
}
#define SETFLAG(s, f) \
do {\
if (strcmp(cp, (s)) == 0) {\
if (clear)\
newflags &= ~(f);\
else\
newflags |= (f);\
}\
} while (0)
/*
* XXX: this macro is not 100% correct, in that it matches "nud" against
* "nudbogus". But we just let it go since this is minor.
*/
#define SETVALUE(f, v) \
do { \
char *valptr; \
unsigned long newval; \
v = 0; /* unspecified */ \
if (strncmp(cp, f, strlen(f)) == 0) { \
valptr = strchr(cp, '='); \
if (valptr == NULL) \
err(1, "syntax error in %s field", (f)); \
errno = 0; \
newval = strtoul(++valptr, NULL, 0); \
if (errno) \
err(1, "syntax error in %s's value", (f)); \
v = newval; \
} \
} while (0)
SETFLAG("disabled", ND6_IFF_IFDISABLED);
SETFLAG("nud", ND6_IFF_PERFORMNUD);
#ifdef ND6_IFF_ACCEPT_RTADV
SETFLAG("accept_rtadv", ND6_IFF_ACCEPT_RTADV);
#endif
#ifdef ND6_IFF_AUTO_LINKLOCAL
SETFLAG("auto_linklocal", ND6_IFF_AUTO_LINKLOCAL);
#endif
#ifdef ND6_IFF_NO_PREFER_IFACE
SETFLAG("no_prefer_iface", ND6_IFF_NO_PREFER_IFACE);
#endif
SETVALUE("basereachable", ND.basereachable);
SETVALUE("retrans", ND.retrans);
SETVALUE("curhlim", ND.chlim);
ND.flags = newflags;
if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
err(1, "ioctl(SIOCSIFINFO_IN6)");
/* NOTREACHED */
}
#undef SETFLAG
#undef SETVALUE
}
if (!ND.initialized) {
errx(1, "%s: not initialized yet", ifname);
/* NOTREACHED */
}
if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
err(1, "ioctl(SIOCGIFINFO_IN6)");
/* NOTREACHED */
}
printf("linkmtu=%d", ND.linkmtu);
printf(", maxmtu=%d", ND.maxmtu);
printf(", curhlim=%d", ND.chlim);
printf(", basereachable=%ds%dms",
ND.basereachable / 1000, ND.basereachable % 1000);
printf(", reachable=%ds", ND.reachable);
printf(", retrans=%ds%dms", ND.retrans / 1000, ND.retrans % 1000);
#ifdef IPV6CTL_USETEMPADDR
memset(nullbuf, 0, sizeof(nullbuf));
if (memcmp(nullbuf, ND.randomid, sizeof(nullbuf)) != 0) {
int j;
u_int8_t *rbuf;
for (i = 0; i < 3; i++) {
switch (i) {
case 0:
printf("\nRandom seed(0): ");
rbuf = ND.randomseed0;
break;
case 1:
printf("\nRandom seed(1): ");
rbuf = ND.randomseed1;
break;
case 2:
printf("\nRandom ID: ");
rbuf = ND.randomid;
break;
default:
errx(1, "impossible case for tempaddr display");
}
for (j = 0; j < 8; j++)
printf("%02x", rbuf[j]);
}
}
#endif
if (ND.flags) {
printf("\nFlags: ");
#ifdef ND6_IFF_IFDISABLED
if ((ND.flags & ND6_IFF_IFDISABLED))
printf("disabled ");
#endif
if ((ND.flags & ND6_IFF_PERFORMNUD))
printf("nud ");
#ifdef ND6_IFF_ACCEPT_RTADV
if ((ND.flags & ND6_IFF_ACCEPT_RTADV))
printf("accept_rtadv ");
#endif
#ifdef ND6_IFF_AUTO_LINKLOCAL
if ((ND.flags & ND6_IFF_AUTO_LINKLOCAL))
printf("auto_linklocal ");
#endif
#ifdef ND6_IFF_NO_PREFER_IFACE
if ((ND.flags & ND6_IFF_NO_PREFER_IFACE))
printf("no_prefer_iface ");
#endif
}
putc('\n', stdout);
#undef ND
close(s);
}
#ifndef ND_RA_FLAG_RTPREF_MASK /* XXX: just for compilation on *BSD release */
#define ND_RA_FLAG_RTPREF_MASK 0x18 /* 00011000 */
#endif
static void
rtrlist()
{
int mib[] = { CTL_NET, PF_INET6, IPPROTO_ICMPV6, ICMPV6CTL_ND6_DRLIST };
char *buf;
struct in6_defrouter *p, *ep;
size_t l;
struct timeval now;
if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0) {
err(1, "sysctl(ICMPV6CTL_ND6_DRLIST)");
/*NOTREACHED*/
}
if (l == 0)
return;
buf = malloc(l);
if (!buf) {
err(1, "malloc");
/*NOTREACHED*/
}
if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) {
err(1, "sysctl(ICMPV6CTL_ND6_DRLIST)");
/*NOTREACHED*/
}
ep = (struct in6_defrouter *)(buf + l);
for (p = (struct in6_defrouter *)buf; p < ep; p++) {
int rtpref;
if (getnameinfo((struct sockaddr *)&p->rtaddr,
p->rtaddr.sin6_len, host_buf, sizeof(host_buf), NULL, 0,
(nflag ? NI_NUMERICHOST : 0)) != 0)
strlcpy(host_buf, "?", sizeof(host_buf));
printf("%s if=%s", host_buf,
if_indextoname(p->if_index, ifix_buf));
printf(", flags=%s%s",
p->flags & ND_RA_FLAG_MANAGED ? "M" : "",
p->flags & ND_RA_FLAG_OTHER ? "O" : "");
rtpref = ((p->flags & ND_RA_FLAG_RTPREF_MASK) >> 3) & 0xff;
printf(", pref=%s", rtpref_str[rtpref]);
gettimeofday(&now, 0);
if (p->expire == 0)
printf(", expire=Never\n");
else
printf(", expire=%s\n",
sec2str(p->expire - now.tv_sec));
}
free(buf);
}
static void
plist()
{
int mib[] = { CTL_NET, PF_INET6, IPPROTO_ICMPV6, ICMPV6CTL_ND6_PRLIST };
char *buf;
struct in6_prefix *p, *ep, *n;
struct sockaddr_in6 *advrtr;
size_t l;
struct timeval now;
const int niflags = NI_NUMERICHOST;
int ninflags = nflag ? NI_NUMERICHOST : 0;
char namebuf[NI_MAXHOST];
if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0) {
err(1, "sysctl(ICMPV6CTL_ND6_PRLIST)");
/*NOTREACHED*/
}
buf = malloc(l);
if (!buf) {
err(1, "malloc");
/*NOTREACHED*/
}
if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) {
err(1, "sysctl(ICMPV6CTL_ND6_PRLIST)");
/*NOTREACHED*/
}
ep = (struct in6_prefix *)(buf + l);
for (p = (struct in6_prefix *)buf; p < ep; p = n) {
advrtr = (struct sockaddr_in6 *)(p + 1);
n = (struct in6_prefix *)&advrtr[p->advrtrs];
if (getnameinfo((struct sockaddr *)&p->prefix,
p->prefix.sin6_len, namebuf, sizeof(namebuf),
NULL, 0, niflags) != 0)
strlcpy(namebuf, "?", sizeof(namebuf));
printf("%s/%d if=%s\n", namebuf, p->prefixlen,
if_indextoname(p->if_index, ifix_buf));
gettimeofday(&now, 0);
/*
* meaning of fields, especially flags, is very different
* by origin. notify the difference to the users.
*/
printf("flags=%s%s%s%s%s",
p->raflags.onlink ? "L" : "",
p->raflags.autonomous ? "A" : "",
(p->flags & NDPRF_ONLINK) != 0 ? "O" : "",
(p->flags & NDPRF_DETACHED) != 0 ? "D" : "",
#ifdef NDPRF_HOME
(p->flags & NDPRF_HOME) != 0 ? "H" : ""
#else
""
#endif
);
if (p->vltime == ND6_INFINITE_LIFETIME)
printf(" vltime=infinity");
else
printf(" vltime=%lu", (unsigned long)p->vltime);
if (p->pltime == ND6_INFINITE_LIFETIME)
printf(", pltime=infinity");
else
printf(", pltime=%lu", (unsigned long)p->pltime);
if (p->expire == 0)
printf(", expire=Never");
else if (p->expire >= now.tv_sec)
printf(", expire=%s",
sec2str(p->expire - now.tv_sec));
else
printf(", expired");
printf(", ref=%d", p->refcnt);
printf("\n");
/*
* "advertising router" list is meaningful only if the prefix
* information is from RA.
*/
if (p->advrtrs) {
int j;
struct sockaddr_in6 *sin6;
sin6 = advrtr;
printf(" advertised by\n");
for (j = 0; j < p->advrtrs; j++) {
struct in6_nbrinfo *nbi;
if (getnameinfo((struct sockaddr *)sin6,
sin6->sin6_len, namebuf, sizeof(namebuf),
NULL, 0, ninflags) != 0)
strlcpy(namebuf, "?", sizeof(namebuf));
printf(" %s", namebuf);
nbi = getnbrinfo(&sin6->sin6_addr,
p->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");
sin6++;
}
} else
printf(" No advertising router\n");
}
free(buf);
}
static void
pfx_flush()
{
char dummyif[IFNAMSIZ+8];
int s;
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
err(1, "socket");
strlcpy(dummyif, "lo0", sizeof(dummyif)); /* dummy */
if (ioctl(s, SIOCSPFXFLUSH_IN6, (caddr_t)&dummyif) < 0)
err(1, "ioctl(SIOCSPFXFLUSH_IN6)");
}
static void
rtr_flush()
{
char dummyif[IFNAMSIZ+8];
int s;
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
err(1, "socket");
strlcpy(dummyif, "lo0", sizeof(dummyif)); /* dummy */
if (ioctl(s, SIOCSRTRFLUSH_IN6, (caddr_t)&dummyif) < 0)
err(1, "ioctl(SIOCSRTRFLUSH_IN6)");
close(s);
}
static void
harmonize_rtr()
{
char dummyif[IFNAMSIZ+8];
int s;
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
err(1, "socket");
strlcpy(dummyif, "lo0", sizeof(dummyif)); /* dummy */
if (ioctl(s, SIOCSNDFLUSH_IN6, (caddr_t)&dummyif) < 0)
err(1, "ioctl(SIOCSNDFLUSH_IN6)");
close(s);
}
#ifdef SIOCSDEFIFACE_IN6 /* XXX: check SIOCGDEFIFACE_IN6 as well? */
static void
setdefif(char *ifname)
{
struct in6_ndifreq ndifreq;
unsigned int ifindex;
if (strcasecmp(ifname, "delete") == 0)
ifindex = 0;
else {
if ((ifindex = if_nametoindex(ifname)) == 0)
err(1, "failed to resolve i/f index for %s", ifname);
}
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
err(1, "socket");
strlcpy(ndifreq.ifname, "lo0", sizeof(ndifreq.ifname)); /* dummy */
ndifreq.ifindex = ifindex;
if (ioctl(s, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq) < 0)
err(1, "ioctl(SIOCSDEFIFACE_IN6)");
close(s);
}
static void
getdefif()
{
struct in6_ndifreq ndifreq;
char ifname[IFNAMSIZ+8];
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
err(1, "socket");
memset(&ndifreq, 0, sizeof(ndifreq));
strlcpy(ndifreq.ifname, "lo0", sizeof(ndifreq.ifname)); /* dummy */
if (ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq) < 0)
err(1, "ioctl(SIOCGDEFIFACE_IN6)");
if (ndifreq.ifindex == 0)
printf("No default interface.\n");
else {
if ((if_indextoname(ndifreq.ifindex, ifname)) == NULL)
err(1, "failed to resolve ifname for index %lu",
ndifreq.ifindex);
printf("ND default interface = %s\n", ifname);
}
close(s);
}
#endif
static char *
sec2str(time_t total)
{
static char result[256];
int days, hours, mins, secs;
int first = 1;
char *p = result;
char *ep = &result[sizeof(result)];
int n;
days = total / 3600 / 24;
hours = (total / 3600) % 24;
mins = (total / 60) % 60;
secs = total % 60;
if (days) {
first = 0;
n = snprintf(p, ep - p, "%dd", days);
if (n < 0 || n >= ep - p)
return "?";
p += n;
}
if (!first || hours) {
first = 0;
n = snprintf(p, ep - p, "%dh", hours);
if (n < 0 || n >= ep - p)
return "?";
p += n;
}
if (!first || mins) {
first = 0;
n = snprintf(p, ep - p, "%dm", mins);
if (n < 0 || n >= ep - p)
return "?";
p += n;
}
snprintf(p, ep - p, "%ds", secs);
return(result);
}
/*
* Print the timestamp
* from tcpdump/util.c
*/
static void
ts_print(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);
}
#undef NEXTADDR
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