1 /* $KAME: traceroute6.c,v 1.68 2004/01/25 11:16:12 suz Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 1990, 1993
36 * The Regents of the University of California. All rights reserved.
38 * This code is derived from software contributed to Berkeley by
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 * 3. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
67 static const char copyright[] =
68 "@(#) Copyright (c) 1990, 1993\n\
69 The Regents of the University of California. All rights reserved.\n";
74 static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93";
76 static const char rcsid[] =
81 * traceroute host - trace the route ip packets follow going to "host".
83 * Attempt to trace the route an ip packet would follow to some
84 * internet host. We find out intermediate hops by launching probe
85 * packets with a small ttl (time to live) then listening for an
86 * icmp "time exceeded" reply from a gateway. We start our probes
87 * with a ttl of one and increase by one until we get an icmp "port
88 * unreachable" (which means we got to "host") or hit a max (which
89 * defaults to 30 hops & can be changed with the -m flag). Three
90 * probes (change with -q flag) are sent at each ttl setting and a
91 * line is printed showing the ttl, address of the gateway and
92 * round trip time of each probe. If the probe answers come from
93 * different gateways, the address of each responding system will
94 * be printed. If there is no response within a 5 sec. timeout
95 * interval (changed with the -w flag), a "*" is printed for that
98 * Probe packets are UDP format. We don't want the destination
99 * host to process them so the destination port is set to an
100 * unlikely value (if some clod on the destination is using that
101 * value, it can be changed with the -p flag).
103 * A sample use might be:
105 * [yak 71]% traceroute nis.nsf.net.
106 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
107 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
108 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
109 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
110 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
111 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
112 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
113 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
114 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
115 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
116 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
117 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms
119 * Note that lines 2 & 3 are the same. This is due to a buggy
120 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
121 * packets with a zero ttl.
123 * A more interesting example is:
125 * [yak 72]% traceroute allspice.lcs.mit.edu.
126 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
127 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
128 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
129 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
130 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
131 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
132 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
133 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
134 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
135 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
136 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
137 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
139 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
144 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
146 * (I start to see why I'm having so much trouble with mail to
147 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away
148 * either don't send ICMP "time exceeded" messages or send them
149 * with a ttl too small to reach us. 14 - 17 are running the
150 * MIT C Gateway code that doesn't send "time exceeded"s. God
151 * only knows what's going on with 12.
153 * The silent gateway 12 in the above may be the result of a bug in
154 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3)
155 * sends an unreachable message using whatever ttl remains in the
156 * original datagram. Since, for gateways, the remaining ttl is
157 * zero, the icmp "time exceeded" is guaranteed to not make it back
158 * to us. The behavior of this bug is slightly more interesting
159 * when it appears on the destination system:
161 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
162 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms
163 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
164 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
165 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
166 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
173 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
175 * Notice that there are 12 "gateways" (13 is the final
176 * destination) and exactly the last half of them are "missing".
177 * What's really happening is that rip (a Sun-3 running Sun OS3.5)
178 * is using the ttl from our arriving datagram as the ttl in its
179 * icmp reply. So, the reply will time out on the return path
180 * (with no notice sent to anyone since icmp's aren't sent for
181 * icmp's) until we probe with a ttl that's at least twice the path
182 * length. I.e., rip is really only 7 hops away. A reply that
183 * returns with a ttl of 1 is a clue this problem exists.
184 * Traceroute prints a "!" after the time if the ttl is <= 1.
185 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
186 * non-standard (HPUX) software, expect to see this problem
187 * frequently and/or take care picking the target host of your
190 * Other possible annotations after the time are !H, !N, !P (got a host,
191 * network or protocol unreachable, respectively), !S or !F (source
192 * route failed or fragmentation needed -- neither of these should
193 * ever occur and the associated gateway is busted if you see one). If
194 * almost all the probes result in some kind of unreachable, traceroute
195 * will give up and exit.
199 * This program must be run by root or be setuid. (I suggest that
200 * you *don't* make it setuid -- casual use could result in a lot
201 * of unnecessary traffic on our poor, congested nets.)
203 * This program requires a kernel mod that does not appear in any
204 * system available from Berkeley: A raw ip socket using proto
205 * IPPROTO_RAW must interpret the data sent as an ip datagram (as
206 * opposed to data to be wrapped in an ip datagram). See the README
207 * file that came with the source to this program for a description
208 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
209 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
210 * MODIFIED TO RUN THIS PROGRAM.
212 * The udp port usage may appear bizarre (well, ok, it is bizarre).
213 * The problem is that an icmp message only contains 8 bytes of
214 * data from the original datagram. 8 bytes is the size of a udp
215 * header so, if we want to associate replies with the original
216 * datagram, the necessary information must be encoded into the
217 * udp header (the ip id could be used but there's no way to
218 * interlock with the kernel's assignment of ip id's and, anyway,
219 * it would have taken a lot more kernel hacking to allow this
220 * code to set the ip id). So, to allow two or more users to
221 * use traceroute simultaneously, we use this task's pid as the
222 * source port (the high bit is set to move the port number out
223 * of the "likely" range). To keep track of which probe is being
224 * replied to (so times and/or hop counts don't get confused by a
225 * reply that was delayed in transit), we increment the destination
226 * port number before each probe.
228 * Don't use this as a coding example. I was trying to find a
229 * routing problem and this code sort-of popped out after 48 hours
230 * without sleep. I was amazed it ever compiled, much less ran.
232 * I stole the idea for this program from Steve Deering. Since
233 * the first release, I've learned that had I attended the right
234 * IETF working group meetings, I also could have stolen it from Guy
235 * Almes or Matt Mathis. I don't know (or care) who came up with
236 * the idea first. I envy the originators' perspicacity and I'm
237 * glad they didn't keep the idea a secret.
239 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
240 * enhancements to the original distribution.
242 * I've hacked up a round-trip-route version of this that works by
243 * sending a loose-source-routed udp datagram through the destination
244 * back to yourself. Unfortunately, SO many gateways botch source
245 * routing, the thing is almost worthless. Maybe one day...
247 * -- Van Jacobson (van@helios.ee.lbl.gov)
248 * Tue Dec 20 03:50:13 PST 1988
251 #include <sys/param.h>
252 #include <sys/time.h>
253 #include <sys/socket.h>
255 #include <sys/file.h>
256 #include <sys/ioctl.h>
257 #include <sys/sysctl.h>
259 #include <netinet/in.h>
261 #include <arpa/inet.h>
274 #include <netinet/ip6.h>
275 #include <netinet/icmp6.h>
276 #include <netinet/sctp.h>
277 #include <netinet/sctp_header.h>
278 #include <netinet/tcp.h>
279 #include <netinet/udp.h>
282 #include <net/route.h>
283 #include <netipsec/ipsec.h>
288 #define DUMMY_PORT 10010
290 #define MAXPACKET 65535 /* max ip packet size */
292 #ifndef HAVE_GETIPNODEBYNAME
293 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y))
294 #define freehostent(x)
297 u_char packet[512]; /* last inbound (icmp) packet */
298 char *outpacket; /* last output packet */
300 int main(int, char *[]);
301 int wait_for_reply(int, struct msghdr *);
303 #ifdef IPSEC_POLICY_IPSEC
304 int setpolicy(int so, char *policy);
307 void send_probe(int, u_long);
308 void *get_uphdr(struct ip6_hdr *, u_char *);
309 int get_hoplim(struct msghdr *);
310 double deltaT(struct timeval *, struct timeval *);
311 const char *pr_type(int);
312 int packet_ok(struct msghdr *, int, int, u_char *, u_char *);
313 void print(struct msghdr *, int);
314 const char *inetname(struct sockaddr *);
315 u_int32_t sctp_crc32c(void *, u_int32_t);
316 u_int16_t in_cksum(u_int16_t *addr, int);
317 u_int16_t tcp_chksum(struct sockaddr_in6 *, struct sockaddr_in6 *,
321 int rcvsock; /* receive (icmp) socket file descriptor */
322 int sndsock; /* send (raw/udp) socket file descriptor */
324 struct msghdr rcvmhdr;
325 struct iovec rcviov[2];
327 struct in6_pktinfo *rcvpktinfo;
329 struct sockaddr_in6 Src, Dst, Rcv;
330 u_long datalen = 20; /* How much data */
331 #define ICMP6ECHOLEN 8
332 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */
334 #ifdef USE_RFC2292BIS
335 struct ip6_rthdr *rth;
337 struct cmsghdr *cmsg;
343 u_long first_hop = 1;
344 u_long max_hops = 30;
346 u_int16_t port = 32768+666; /* start udp dest port # for probe packets */
348 int options; /* socket options */
350 int waittime = 5; /* time to wait for response (in seconds) */
351 int nflag; /* print addresses numerically */
352 int useproto = IPPROTO_UDP; /* protocol to use to send packet */
353 int lflag; /* print both numerical address & hostname */
354 int as_path; /* print as numbers for each hop */
355 char *as_server = NULL;
359 main(int argc, char *argv[])
361 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM };
362 char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep;
363 int ch, i, on = 1, seq, rcvcmsglen, error;
364 struct addrinfo hints, *res;
365 static u_char *rcvcmsgbuf;
366 u_long probe, hops, lport;
375 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
376 perror("socket(ICMPv6)");
381 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0);
384 /* specify to tell receiving interface */
385 #ifdef IPV6_RECVPKTINFO
386 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
388 err(1, "setsockopt(IPV6_RECVPKTINFO)");
389 #else /* old adv. API */
390 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
392 err(1, "setsockopt(IPV6_PKTINFO)");
395 /* specify to tell value of hoplimit field of received IP6 hdr */
396 #ifdef IPV6_RECVHOPLIMIT
397 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
399 err(1, "setsockopt(IPV6_RECVHOPLIMIT)");
400 #else /* old adv. API */
401 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
403 err(1, "setsockopt(IPV6_HOPLIMIT)");
407 ident = htons(getpid() & 0xffff); /* same as ping6 */
409 while ((ch = getopt(argc, argv, "aA:df:g:Ilm:nNp:q:rs:STUvw:")) != -1)
424 first_hop = strtoul(optarg, &ep, 0);
425 if (errno || !*optarg || *ep || first_hop > 255) {
427 "traceroute6: invalid min hoplimit.\n");
432 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno);
435 "traceroute6: unknown host %s\n", optarg);
438 #ifdef USE_RFC2292BIS
441 * XXX: We can't detect the number of
442 * intermediate nodes yet.
444 if ((rth = inet6_rth_init((void *)rtbuf,
445 sizeof(rtbuf), IPV6_RTHDR_TYPE_0,
448 "inet6_rth_init failed.\n");
452 if (inet6_rth_add((void *)rth,
453 (struct in6_addr *)hp->h_addr)) {
455 "inet6_rth_add failed for %s\n",
459 #else /* old advanced API */
461 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0);
462 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr,
468 useproto = IPPROTO_ICMPV6;
476 max_hops = strtoul(optarg, &ep, 0);
477 if (errno || !*optarg || *ep || max_hops > 255) {
479 "traceroute6: invalid max hoplimit.\n");
487 useproto = IPPROTO_NONE;
492 lport = strtoul(optarg, &ep, 0);
493 if (errno || !*optarg || *ep) {
494 fprintf(stderr, "traceroute6: invalid port.\n");
497 if (lport == 0 || lport != (lport & 0xffff)) {
499 "traceroute6: port out of range.\n");
502 port = lport & 0xffff;
507 nprobes = strtoul(optarg, &ep, 0);
508 if (errno || !*optarg || *ep) {
510 "traceroute6: invalid nprobes.\n");
515 "traceroute6: nprobes must be >0.\n");
520 options |= SO_DONTROUTE;
524 * set the ip source address of the outbound
525 * probe (e.g., on a multi-homed host).
530 useproto = IPPROTO_SCTP;
533 useproto = IPPROTO_TCP;
536 useproto = IPPROTO_UDP;
544 waittime = strtoul(optarg, &ep, 0);
545 if (errno || !*optarg || *ep) {
547 "traceroute6: invalid wait time.\n");
552 "traceroute6: wait must be >= 1 sec.\n");
563 * Open socket to send probe packets.
570 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
571 perror("socket(SOCK_DGRAM)");
578 if ((sndsock = socket(AF_INET6, SOCK_RAW, useproto)) < 0) {
579 perror("socket(SOCK_RAW)");
584 fprintf(stderr, "traceroute6: unknown probe protocol %d\n",
588 if (max_hops < first_hop) {
590 "traceroute6: max hoplimit must be larger than first hoplimit.\n");
596 if (setresuid(uid, uid, uid) == -1) {
602 if (argc < 1 || argc > 2)
606 setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
611 memset(&hints, 0, sizeof(hints));
612 hints.ai_family = PF_INET6;
613 hints.ai_socktype = SOCK_RAW;
614 hints.ai_protocol = IPPROTO_ICMPV6;
615 hints.ai_flags = AI_CANONNAME;
616 error = getaddrinfo(*argv, NULL, &hints, &res);
619 "traceroute6: %s\n", gai_strerror(error));
622 if (res->ai_addrlen != sizeof(Dst)) {
624 "traceroute6: size of sockaddr mismatch\n");
627 memcpy(&Dst, res->ai_addr, res->ai_addrlen);
628 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv;
630 fprintf(stderr, "traceroute6: not enough core\n");
634 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf,
635 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
636 strlcpy(hbuf, "?", sizeof(hbuf));
637 fprintf(stderr, "traceroute6: Warning: %s has multiple "
638 "addresses; using %s\n", hostname, hbuf);
644 datalen = strtoul(*argv, &ep, 0);
647 "traceroute6: invalid packet length.\n");
653 minlen = ICMP6ECHOLEN;
656 minlen = sizeof(struct udphdr);
663 minlen = sizeof(struct sctphdr);
666 minlen = sizeof(struct tcphdr);
669 fprintf(stderr, "traceroute6: unknown probe protocol %d.\n",
673 if (datalen < minlen)
675 else if (datalen >= MAXPACKET) {
677 "traceroute6: packet size must be %zu <= s < %d.\n",
681 if (useproto == IPPROTO_UDP)
682 datalen -= sizeof(struct udphdr);
683 if ((useproto == IPPROTO_SCTP) && (datalen & 3)) {
685 "traceroute6: packet size must be a multiple of 4.\n");
688 outpacket = malloc(datalen);
693 (void) bzero((char *)outpacket, datalen);
695 /* initialize msghdr for receiving packets */
696 rcviov[0].iov_base = (caddr_t)packet;
697 rcviov[0].iov_len = sizeof(packet);
698 rcvmhdr.msg_name = (caddr_t)&Rcv;
699 rcvmhdr.msg_namelen = sizeof(Rcv);
700 rcvmhdr.msg_iov = rcviov;
701 rcvmhdr.msg_iovlen = 1;
702 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
703 CMSG_SPACE(sizeof(int));
704 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) {
705 fprintf(stderr, "traceroute6: malloc failed\n");
708 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
709 rcvmhdr.msg_controllen = rcvcmsglen;
711 if (options & SO_DEBUG)
712 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
713 (char *)&on, sizeof(on));
714 if (options & SO_DONTROUTE)
715 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
716 (char *)&on, sizeof(on));
718 #ifdef IPSEC_POLICY_IPSEC
720 * do not raise error even if setsockopt fails, kernel may have ipsec
723 if (setpolicy(rcvsock, "in bypass") < 0)
724 errx(1, "%s", ipsec_strerror());
725 if (setpolicy(rcvsock, "out bypass") < 0)
726 errx(1, "%s", ipsec_strerror());
729 int level = IPSEC_LEVEL_NONE;
731 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
733 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
735 #ifdef IP_AUTH_TRANS_LEVEL
736 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
739 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
742 #ifdef IP_AUTH_NETWORK_LEVEL
743 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
747 #endif /*IPSEC_POLICY_IPSEC*/
754 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i,
756 perror("setsockopt(SO_SNDBUF)");
759 #endif /* SO_SNDBUF */
760 if (options & SO_DEBUG)
761 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
762 (char *)&on, sizeof(on));
763 if (options & SO_DONTROUTE)
764 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
765 (char *)&on, sizeof(on));
766 #ifdef USE_RFC2292BIS
767 if (rth) {/* XXX: there is no library to finalize the header... */
768 rth->ip6r_len = rth->ip6r_segleft * 2;
769 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR,
770 (void *)rth, (rth->ip6r_len + 1) << 3)) {
771 fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n",
776 #else /* old advanced API */
778 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE);
779 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS,
780 rtbuf, cmsg->cmsg_len) < 0) {
781 fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n",
786 #endif /* USE_RFC2292BIS */
788 #ifdef IPSEC_POLICY_IPSEC
790 * do not raise error even if setsockopt fails, kernel may have ipsec
793 if (setpolicy(sndsock, "in bypass") < 0)
794 errx(1, "%s", ipsec_strerror());
795 if (setpolicy(sndsock, "out bypass") < 0)
796 errx(1, "%s", ipsec_strerror());
799 int level = IPSEC_LEVEL_BYPASS;
801 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
803 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
805 #ifdef IP_AUTH_TRANS_LEVEL
806 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
809 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
812 #ifdef IP_AUTH_NETWORK_LEVEL
813 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
817 #endif /*IPSEC_POLICY_IPSEC*/
823 bzero(&Src, sizeof(Src));
825 struct addrinfo hints, *res;
828 memset(&hints, 0, sizeof(hints));
829 hints.ai_family = AF_INET6;
830 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
831 hints.ai_flags = AI_NUMERICHOST;
832 error = getaddrinfo(source, "0", &hints, &res);
834 printf("traceroute6: %s: %s\n", source,
835 gai_strerror(error));
838 if (res->ai_addrlen > sizeof(Src)) {
839 printf("traceroute6: %s: %s\n", source,
840 gai_strerror(error));
843 memcpy(&Src, res->ai_addr, res->ai_addrlen);
846 struct sockaddr_in6 Nxt;
851 Nxt.sin6_port = htons(DUMMY_PORT);
853 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr,
854 sizeof(Nxt.sin6_addr));
855 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
859 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) {
864 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) {
865 perror("getsockname");
868 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len,
869 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) {
870 fprintf(stderr, "getnameinfo failed for source\n");
877 Src.sin6_port = htons(0);
878 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) {
887 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) {
888 perror("getsockname");
891 srcport = ntohs(Src.sin6_port);
895 asn = as_setup(as_server);
898 "traceroute6: as_setup failed, AS# lookups"
900 (void)fflush(stderr);
908 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf,
909 sizeof(hbuf), NULL, 0, NI_NUMERICHOST))
910 strlcpy(hbuf, "(invalid)", sizeof(hbuf));
911 fprintf(stderr, "traceroute6");
912 fprintf(stderr, " to %s (%s)", hostname, hbuf);
914 fprintf(stderr, " from %s", source);
915 fprintf(stderr, ", %lu hops max, %lu byte packets\n",
917 datalen + ((useproto == IPPROTO_UDP) ? sizeof(struct udphdr) : 0));
918 (void) fflush(stderr);
921 printf("Skipping %lu intermediate hops\n", first_hop - 1);
926 for (hops = first_hop; hops <= max_hops; ++hops) {
927 struct in6_addr lastaddr;
929 unsigned unreachable = 0;
931 printf("%2lu ", hops);
932 bzero(&lastaddr, sizeof(lastaddr));
933 for (probe = 0; probe < nprobes; ++probe) {
935 struct timeval t1, t2;
937 (void) gettimeofday(&t1, NULL);
938 send_probe(++seq, hops);
939 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) {
940 (void) gettimeofday(&t2, NULL);
941 if (packet_ok(&rcvmhdr, cc, seq, &type, &code)) {
942 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr,
945 fputs("\n ", stdout);
947 lastaddr = Rcv.sin6_addr;
949 printf(" %.3f ms", deltaT(&t1, &t2));
950 if (type == ICMP6_DST_UNREACH) {
952 case ICMP6_DST_UNREACH_NOROUTE:
956 case ICMP6_DST_UNREACH_ADMIN:
960 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
964 case ICMP6_DST_UNREACH_ADDR:
968 case ICMP6_DST_UNREACH_NOPORT:
975 } else if (type == ICMP6_ECHO_REPLY) {
982 } else if (deltaT(&t1, &t2) > waittime * 1000) {
989 (void) fflush(stdout);
993 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) {
1004 wait_for_reply(int sock, struct msghdr *mhdr)
1007 struct pollfd pfd[1];
1011 pfd[0].events = POLLIN;
1014 if (poll(pfd, 1, waittime * 1000) > 0)
1015 cc = recvmsg(rcvsock, mhdr, 0);
1020 struct timeval wait;
1023 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);
1024 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL)
1026 memset(fdsp, 0, fdsn);
1028 wait.tv_sec = waittime; wait.tv_usec = 0;
1030 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0)
1031 cc = recvmsg(rcvsock, mhdr, 0);
1039 #ifdef IPSEC_POLICY_IPSEC
1041 setpolicy(so, policy)
1047 buf = ipsec_set_policy(policy, strlen(policy));
1049 warnx("%s", ipsec_strerror());
1052 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY,
1053 buf, ipsec_get_policylen(buf));
1063 send_probe(int seq, u_long hops)
1065 struct icmp6_hdr *icp;
1066 struct sctphdr *sctp;
1067 struct sctp_chunkhdr *chk;
1068 struct sctp_init_chunk *init;
1069 struct sctp_paramhdr *param;
1074 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1075 (char *)&i, sizeof(i)) < 0) {
1076 perror("setsockopt IPV6_UNICAST_HOPS");
1079 Dst.sin6_port = htons(port + seq);
1082 case IPPROTO_ICMPV6:
1083 icp = (struct icmp6_hdr *)outpacket;
1085 icp->icmp6_type = ICMP6_ECHO_REQUEST;
1086 icp->icmp6_code = 0;
1087 icp->icmp6_cksum = 0;
1088 icp->icmp6_id = ident;
1089 icp->icmp6_seq = htons(seq);
1094 /* No space for anything. No harm as seq/tv32 are decorative. */
1097 sctp = (struct sctphdr *)outpacket;
1099 sctp->src_port = htons(ident);
1100 sctp->dest_port = htons(port + seq);
1101 if (datalen >= (u_long)(sizeof(struct sctphdr) +
1102 sizeof(struct sctp_init_chunk))) {
1105 sctp->v_tag = (sctp->src_port << 16) | sctp->dest_port;
1107 sctp->checksum = htonl(0);
1108 if (datalen >= (u_long)(sizeof(struct sctphdr) +
1109 sizeof(struct sctp_init_chunk))) {
1111 * Send a packet containing an INIT chunk. This works
1112 * better in case of firewalls on the path, but
1113 * results in a probe packet containing at least
1114 * 32 bytes of payload. For shorter payloads, use
1115 * SHUTDOWN-ACK chunks.
1117 init = (struct sctp_init_chunk *)(sctp + 1);
1118 init->ch.chunk_type = SCTP_INITIATION;
1119 init->ch.chunk_flags = 0;
1120 init->ch.chunk_length = htons((u_int16_t)(datalen -
1121 sizeof(struct sctphdr)));
1122 init->init.initiate_tag = (sctp->src_port << 16) |
1124 init->init.a_rwnd = htonl(1500);
1125 init->init.num_outbound_streams = htons(1);
1126 init->init.num_inbound_streams = htons(1);
1127 init->init.initial_tsn = htonl(0);
1128 if (datalen >= (u_long)(sizeof(struct sctphdr) +
1129 sizeof(struct sctp_init_chunk) +
1130 sizeof(struct sctp_paramhdr))) {
1131 param = (struct sctp_paramhdr *)(init + 1);
1132 param->param_type = htons(SCTP_PAD);
1133 param->param_length =
1134 htons((u_int16_t)(datalen -
1135 sizeof(struct sctphdr) -
1136 sizeof(struct sctp_init_chunk)));
1140 * Send a packet containing a SHUTDOWN-ACK chunk,
1141 * possibly followed by a PAD chunk.
1143 if (datalen >= (u_long)(sizeof(struct sctphdr) +
1144 sizeof(struct sctp_chunkhdr))) {
1145 chk = (struct sctp_chunkhdr *)(sctp + 1);
1146 chk->chunk_type = SCTP_SHUTDOWN_ACK;
1147 chk->chunk_flags = 0;
1148 chk->chunk_length = htons(4);
1150 if (datalen >= (u_long)(sizeof(struct sctphdr) +
1151 2 * sizeof(struct sctp_chunkhdr))) {
1153 chk->chunk_type = SCTP_PAD_CHUNK;
1154 chk->chunk_flags = 0;
1155 chk->chunk_length = htons((u_int16_t)(datalen -
1156 sizeof(struct sctphdr) -
1157 sizeof(struct sctp_chunkhdr)));
1160 sctp->checksum = sctp_crc32c(outpacket, datalen);
1163 tcp = (struct tcphdr *)outpacket;
1165 tcp->th_sport = htons(ident);
1166 tcp->th_dport = htons(port + seq);
1167 tcp->th_seq = (tcp->th_sport << 16) | tcp->th_dport;
1170 tcp->th_flags = TH_SYN;
1172 tcp->th_sum = tcp_chksum(&Src, &Dst, outpacket, datalen);
1175 fprintf(stderr, "Unknown probe protocol %d.\n", useproto);
1179 i = sendto(sndsock, (char *)outpacket, datalen, 0,
1180 (struct sockaddr *)&Dst, Dst.sin6_len);
1181 if (i < 0 || (u_long)i != datalen) {
1184 printf("traceroute6: wrote %s %lu chars, ret=%d\n",
1185 hostname, datalen, i);
1186 (void) fflush(stdout);
1191 get_hoplim(struct msghdr *mhdr)
1195 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1196 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1197 if (cm->cmsg_level == IPPROTO_IPV6 &&
1198 cm->cmsg_type == IPV6_HOPLIMIT &&
1199 cm->cmsg_len == CMSG_LEN(sizeof(int)))
1200 return (*(int *)CMSG_DATA(cm));
1207 deltaT(struct timeval *t1p, struct timeval *t2p)
1211 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
1212 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
1217 * Convert an ICMP "type" field to a printable string.
1222 u_char t = t0 & 0xff;
1226 case ICMP6_DST_UNREACH:
1227 cp = "Destination Unreachable";
1229 case ICMP6_PACKET_TOO_BIG:
1230 cp = "Packet Too Big";
1232 case ICMP6_TIME_EXCEEDED:
1233 cp = "Time Exceeded";
1235 case ICMP6_PARAM_PROB:
1236 cp = "Parameter Problem";
1238 case ICMP6_ECHO_REQUEST:
1239 cp = "Echo Request";
1241 case ICMP6_ECHO_REPLY:
1244 case ICMP6_MEMBERSHIP_QUERY:
1245 cp = "Group Membership Query";
1247 case ICMP6_MEMBERSHIP_REPORT:
1248 cp = "Group Membership Report";
1250 case ICMP6_MEMBERSHIP_REDUCTION:
1251 cp = "Group Membership Reduction";
1253 case ND_ROUTER_SOLICIT:
1254 cp = "Router Solicitation";
1256 case ND_ROUTER_ADVERT:
1257 cp = "Router Advertisement";
1259 case ND_NEIGHBOR_SOLICIT:
1260 cp = "Neighbor Solicitation";
1262 case ND_NEIGHBOR_ADVERT:
1263 cp = "Neighbor Advertisement";
1276 packet_ok(struct msghdr *mhdr, int cc, int seq, u_char *type, u_char *code)
1278 struct icmp6_hdr *icp;
1279 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
1280 char *buf = (char *)mhdr->msg_iov[0].iov_base;
1283 char hbuf[NI_MAXHOST];
1291 ip = (struct ip6_hdr *) buf;
1292 hlen = sizeof(struct ip6_hdr);
1293 if (cc < hlen + sizeof(struct icmp6_hdr)) {
1295 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1296 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
1297 strlcpy(hbuf, "invalid", sizeof(hbuf));
1298 printf("packet too short (%d bytes) from %s\n", cc,
1304 icp = (struct icmp6_hdr *)(buf + hlen);
1306 if (cc < (int)sizeof(struct icmp6_hdr)) {
1308 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1309 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
1310 strlcpy(hbuf, "invalid", sizeof(hbuf));
1311 printf("data too short (%d bytes) from %s\n", cc, hbuf);
1315 icp = (struct icmp6_hdr *)buf;
1317 /* get optional information via advanced API */
1320 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1321 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1322 if (cm->cmsg_level == IPPROTO_IPV6 &&
1323 cm->cmsg_type == IPV6_PKTINFO &&
1325 CMSG_LEN(sizeof(struct in6_pktinfo)))
1326 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm));
1328 if (cm->cmsg_level == IPPROTO_IPV6 &&
1329 cm->cmsg_type == IPV6_HOPLIMIT &&
1330 cm->cmsg_len == CMSG_LEN(sizeof(int)))
1331 hlimp = (int *)CMSG_DATA(cm);
1333 if (rcvpktinfo == NULL || hlimp == NULL) {
1334 warnx("failed to get received hop limit or packet info");
1338 rcvhlim = 0; /*XXX*/
1344 *type = icp->icmp6_type;
1345 *code = icp->icmp6_code;
1346 if ((*type == ICMP6_TIME_EXCEEDED &&
1347 *code == ICMP6_TIME_EXCEED_TRANSIT) ||
1348 (*type == ICMP6_DST_UNREACH)) {
1349 struct ip6_hdr *hip;
1350 struct icmp6_hdr *icmp;
1351 struct sctp_init_chunk *init;
1352 struct sctphdr *sctp;
1357 hip = (struct ip6_hdr *)(icp + 1);
1358 if ((up = get_uphdr(hip, (u_char *)(buf + cc))) == NULL) {
1360 warnx("failed to get upper layer header");
1364 case IPPROTO_ICMPV6:
1365 icmp = (struct icmp6_hdr *)up;
1366 if (icmp->icmp6_id == ident &&
1367 icmp->icmp6_seq == htons(seq))
1371 udp = (struct udphdr *)up;
1372 if (udp->uh_sport == htons(srcport) &&
1373 udp->uh_dport == htons(port + seq))
1377 sctp = (struct sctphdr *)up;
1378 if (sctp->src_port != htons(ident) ||
1379 sctp->dest_port != htons(port + seq)) {
1382 if (datalen >= (u_long)(sizeof(struct sctphdr) +
1383 sizeof(struct sctp_init_chunk))) {
1384 if (sctp->v_tag != 0) {
1387 init = (struct sctp_init_chunk *)(sctp + 1);
1388 /* Check the initiate tag, if available. */
1389 if ((char *)&init->init.a_rwnd > buf + cc) {
1392 if (init->init.initiate_tag == (u_int32_t)
1393 ((sctp->src_port << 16) | sctp->dest_port)) {
1398 (u_int32_t)((sctp->src_port << 16) |
1405 tcp = (struct tcphdr *)up;
1406 if (tcp->th_sport == htons(ident) &&
1407 tcp->th_dport == htons(port + seq) &&
1409 (tcp_seq)((tcp->th_sport << 16) | tcp->th_dport))
1415 fprintf(stderr, "Unknown probe proto %d.\n", useproto);
1418 } else if (useproto == IPPROTO_ICMPV6 && *type == ICMP6_ECHO_REPLY) {
1419 if (icp->icmp6_id == ident &&
1420 icp->icmp6_seq == htons(seq))
1424 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN];
1428 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1429 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0)
1430 strlcpy(sbuf, "invalid", sizeof(sbuf));
1431 printf("\n%d bytes from %s to %s", cc, sbuf,
1432 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1433 dbuf, sizeof(dbuf)) : "?");
1434 printf(": icmp type %d (%s) code %d\n", *type, pr_type(*type),
1436 p = (u_int8_t *)(icp + 1);
1438 for (i = 0; i < cc; i++) {
1443 printf("%02x", p[i]);
1444 if (i % WIDTH == WIDTH - 1)
1447 if (cc % WIDTH != 0)
1454 * Increment pointer until find the UDP or ICMP header.
1457 get_uphdr(struct ip6_hdr *ip6, u_char *lim)
1459 u_char *cp = (u_char *)ip6, nh;
1461 static u_char none_hdr[1]; /* Fake pointer for IPPROTO_NONE. */
1463 if (cp + sizeof(*ip6) > lim)
1467 cp += sizeof(struct ip6_hdr);
1469 while (lim - cp >= (nh == IPPROTO_NONE ? 0 : 8)) {
1473 case IPPROTO_ICMPV6:
1474 return (useproto == nh ? cp : NULL);
1478 return (useproto == nh ? cp : NULL);
1480 return (useproto == nh ? none_hdr : NULL);
1481 case IPPROTO_FRAGMENT:
1482 hlen = sizeof(struct ip6_frag);
1483 nh = ((struct ip6_frag *)cp)->ip6f_nxt;
1486 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2;
1487 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1490 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3;
1491 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1502 print(struct msghdr *mhdr, int cc)
1504 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
1505 char hbuf[NI_MAXHOST];
1507 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1508 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
1509 strlcpy(hbuf, "invalid", sizeof(hbuf));
1511 printf(" [AS%u]", as_lookup(asn, hbuf, AF_INET6));
1513 printf(" %s", hbuf);
1515 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf);
1517 printf(" %s", inetname((struct sockaddr *)from));
1521 printf(" %d bytes to %s", cc,
1522 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1523 hbuf, sizeof(hbuf)) : "?");
1525 printf(" %d bytes of data to %s", cc,
1526 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1527 hbuf, sizeof(hbuf)) : "?");
1533 * Construct an Internet address representation.
1534 * If the nflag has been supplied, give
1535 * numeric value, otherwise try for symbolic name.
1538 inetname(struct sockaddr *sa)
1540 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1];
1541 static int first = 1;
1544 if (first && !nflag) {
1546 if (gethostname(domain, sizeof(domain)) == 0 &&
1547 (cp = strchr(domain, '.')))
1548 (void) strlcpy(domain, cp + 1, sizeof(domain));
1554 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1555 NI_NAMEREQD) == 0) {
1556 if ((cp = strchr(line, '.')) &&
1557 !strcmp(cp + 1, domain))
1565 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1566 NI_NUMERICHOST) != 0)
1567 strlcpy(line, "invalid", sizeof(line));
1572 * CRC32C routine for the Stream Control Transmission Protocol
1575 #define CRC32C(c, d) (c = (c>>8) ^ crc_c[(c^(d))&0xFF])
1577 static u_int32_t crc_c[256] = {
1578 0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4,
1579 0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB,
1580 0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B,
1581 0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24,
1582 0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B,
1583 0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384,
1584 0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54,
1585 0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B,
1586 0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A,
1587 0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35,
1588 0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5,
1589 0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA,
1590 0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45,
1591 0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A,
1592 0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A,
1593 0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595,
1594 0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48,
1595 0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957,
1596 0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687,
1597 0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198,
1598 0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927,
1599 0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38,
1600 0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8,
1601 0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7,
1602 0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096,
1603 0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789,
1604 0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859,
1605 0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46,
1606 0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9,
1607 0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6,
1608 0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36,
1609 0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829,
1610 0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C,
1611 0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93,
1612 0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043,
1613 0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C,
1614 0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3,
1615 0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC,
1616 0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C,
1617 0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033,
1618 0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652,
1619 0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D,
1620 0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D,
1621 0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982,
1622 0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D,
1623 0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622,
1624 0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2,
1625 0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED,
1626 0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530,
1627 0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F,
1628 0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF,
1629 0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0,
1630 0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F,
1631 0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540,
1632 0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90,
1633 0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F,
1634 0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE,
1635 0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1,
1636 0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321,
1637 0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E,
1638 0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81,
1639 0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E,
1640 0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E,
1641 0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351
1645 sctp_crc32c(void *packet, u_int32_t len)
1647 u_int32_t i, crc32c;
1648 u_int8_t byte0, byte1, byte2, byte3;
1649 u_int8_t *buf = (u_int8_t *)packet;
1652 for (i = 0; i < len; i++)
1653 CRC32C(crc32c, buf[i]);
1655 byte0 = crc32c & 0xff;
1656 byte1 = (crc32c>>8) & 0xff;
1657 byte2 = (crc32c>>16) & 0xff;
1658 byte3 = (crc32c>>24) & 0xff;
1659 crc32c = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
1660 return htonl(crc32c);
1664 in_cksum(u_int16_t *addr, int len)
1667 u_int16_t *w = addr;
1672 * Our algorithm is simple, using a 32 bit accumulator (sum),
1673 * we add sequential 16 bit words to it, and at the end, fold
1674 * back all the carry bits from the top 16 bits into the lower
1682 /* mop up an odd byte, if necessary */
1684 sum += *(u_char *)w;
1687 * add back carry outs from top 16 bits to low 16 bits
1689 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
1690 sum += (sum >> 16); /* add carry */
1691 answer = ~sum; /* truncate to 16 bits */
1696 tcp_chksum(struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
1697 void *payload, u_int32_t len)
1700 struct in6_addr src;
1701 struct in6_addr dst;
1708 pseudo_hdr.src = src->sin6_addr;
1709 pseudo_hdr.dst = dst->sin6_addr;
1710 pseudo_hdr.len = htonl(len);
1711 pseudo_hdr.zero[0] = 0;
1712 pseudo_hdr.zero[1] = 0;
1713 pseudo_hdr.zero[2] = 0;
1714 pseudo_hdr.next = IPPROTO_TCP;
1716 sum[1] = in_cksum((u_int16_t *)&pseudo_hdr, sizeof(pseudo_hdr));
1717 sum[0] = in_cksum(payload, len);
1719 return (~in_cksum(sum, sizeof(sum)));
1727 "usage: traceroute6 [-adIlnNrSTUv] [-A as_server] [-f firsthop] [-g gateway]\n"
1728 " [-m hoplimit] [-p port] [-q probes] [-s src] [-w waittime] target\n"