1 /*
2 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6
7 /*
8 * Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997
9 * The Regents of the University of California. All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that: (1) source code distributions
13 * retain the above copyright notice and this paragraph in its entirety, (2)
14 * distributions including binary code include the above copyright notice and
15 * this paragraph in its entirety in the documentation or other materials
16 * provided with the distribution, and (3) all advertising materials mentioning
17 * features or use of this software display the following acknowledgement:
18 * ``This product includes software developed by the University of California,
19 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
20 * the University nor the names of its contributors may be used to endorse
21 * or promote products derived from this software without specific prior
22 * written permission.
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
26 *
27 *
28 * @(#)$Header: traceroute.c,v 1.49 97/06/13 02:30:23 leres Exp $ (LBL)
29 */
30
31 #pragma ident "%Z%%M% %I% %E% SMI"
32
33 #include <sys/socket.h>
34
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <ctype.h>
38 #include <strings.h>
39 #include <libintl.h>
40 #include <errno.h>
41 #include <netdb.h>
42
43 #include <netinet/in_systm.h>
44 #include <netinet/in.h>
45 #include <netinet/ip.h>
46 #include <netinet/ip_var.h>
47 #include <netinet/ip_icmp.h>
48 #include <netinet/udp.h>
49 #include <netinet/udp_var.h>
50 #include <netinet/ip6.h>
51 #include <netinet/icmp6.h>
52
53 #include <arpa/inet.h>
54
55 #include <libinetutil.h>
56 #include "traceroute.h"
57
58 int check_reply6(struct msghdr *, int, int, uchar_t *, uchar_t *);
59 void *find_ancillary_data(struct msghdr *, int, int);
60 extern char *inet_name(union any_in_addr *, int);
61 static int IPv6_hdrlen(ip6_t *, int, uint8_t *);
62 static char *pr_type6(uchar_t);
63 void print_addr6(uchar_t *, int, struct sockaddr *);
64 boolean_t print_icmp_other6(uchar_t, uchar_t);
65 void send_probe6(int, struct msghdr *, struct ip *, int, int,
66 struct timeval *, int);
67 void set_ancillary_data(struct msghdr *, int, union any_in_addr *, int, uint_t);
68 struct ip *set_buffers6(int);
69 static boolean_t update_hoplimit_ancillary_data(struct msghdr *, int);
70
71 /*
72 * prepares the buffer to be sent as an IP datagram
73 */
74 struct ip *
set_buffers6(int plen)75 set_buffers6(int plen)
76 {
77 struct ip *outip;
78 uchar_t *outp;
79 struct udphdr *outudp;
80 struct icmp *outicmp;
81 int optlen = 0;
82
83 outip = (struct ip *)malloc((size_t)plen);
84 if (outip == NULL) {
85 Fprintf(stderr, "%s: malloc: %s\n", prog, strerror(errno));
86 exit(EXIT_FAILURE);
87 }
88
89 if (gw_count > 0) {
90 /* ip6_rthdr0 structure includes one gateway address */
91 optlen = sizeof (struct ip6_rthdr0) +
92 gw_count * sizeof (struct in6_addr);
93 }
94
95 (void) memset((char *)outip, 0, (size_t)plen);
96 outp = (uchar_t *)(outip + 1);
97
98 if (useicmp) {
99 /* LINTED E_BAD_PTR_CAST_ALIGN */
100 outicmp = (struct icmp *)outp;
101 outicmp->icmp_type = ICMP6_ECHO_REQUEST;
102 outicmp->icmp_id = htons(ident);
103 } else {
104 /* LINTED E_BAD_PTR_CAST_ALIGN */
105 outudp = (struct udphdr *)outp;
106 /*
107 * "source port" is set at bind() call, so we don't do it
108 * again
109 */
110 outudp->uh_ulen = htons((ushort_t)(plen -
111 (sizeof (struct ip6_hdr) + optlen)));
112 }
113
114 return (outip);
115 }
116
117 /*
118 * Initialize the msghdr for specifying hoplimit, outgoing interface and routing
119 * header for the probe packets.
120 */
121 void
set_ancillary_data(struct msghdr * msgp,int hoplimit,union any_in_addr * gwIPlist,int gw_cnt,uint_t if_index)122 set_ancillary_data(struct msghdr *msgp, int hoplimit,
123 union any_in_addr *gwIPlist, int gw_cnt, uint_t if_index)
124 {
125 size_t hoplimit_space;
126 size_t rthdr_space;
127 size_t pktinfo_space;
128 size_t bufspace;
129 struct cmsghdr *cmsgp;
130 uchar_t *cmsg_datap;
131 int i;
132
133 msgp->msg_control = NULL;
134 msgp->msg_controllen = 0;
135
136 /*
137 * Need to figure out size of buffer needed for ancillary data
138 * containing routing header and packet info options.
139 *
140 * Portable heuristic to compute upper bound on space needed for
141 * N ancillary data options. It assumes up to _MAX_ALIGNMENT padding
142 * after both header and data as the worst possible upper bound on space
143 * consumed by padding.
144 * It also adds one extra "sizeof (struct cmsghdr)" for the last option.
145 * This is needed because we would like to use CMSG_NXTHDR() while
146 * composing the buffer. The CMSG_NXTHDR() macro is designed better for
147 * parsing than composing the buffer. It requires the pointer it returns
148 * to leave space in buffer for addressing a cmsghdr and we want to make
149 * sure it works for us while we skip beyond the last ancillary data
150 * option.
151 *
152 * bufspace[i] = sizeof(struct cmsghdr) + <pad after header> +
153 * <option[i] content length> + <pad after data>;
154 *
155 * total_bufspace = bufspace[0] + bufspace[1] + ...
156 * ... + bufspace[N-1] + sizeof (struct cmsghdr);
157 */
158
159 rthdr_space = 0;
160 pktinfo_space = 0;
161 /* We'll always set the hoplimit of the outgoing packets */
162 hoplimit_space = sizeof (int);
163 bufspace = sizeof (struct cmsghdr) + _MAX_ALIGNMENT +
164 hoplimit_space + _MAX_ALIGNMENT;
165
166 if (gw_cnt > 0) {
167 rthdr_space = inet6_rth_space(IPV6_RTHDR_TYPE_0, gw_cnt);
168 bufspace += sizeof (struct cmsghdr) + _MAX_ALIGNMENT +
169 rthdr_space + _MAX_ALIGNMENT;
170 }
171
172 if (if_index != 0) {
173 pktinfo_space = sizeof (struct in6_pktinfo);
174 bufspace += sizeof (struct cmsghdr) + _MAX_ALIGNMENT +
175 pktinfo_space + _MAX_ALIGNMENT;
176 }
177
178 /*
179 * We need to temporarily set the msgp->msg_controllen to bufspace
180 * (we will later trim it to actual length used). This is needed because
181 * CMSG_NXTHDR() uses it to check we have not exceeded the bounds.
182 */
183 bufspace += sizeof (struct cmsghdr);
184 msgp->msg_controllen = bufspace;
185
186 msgp->msg_control = (struct cmsghdr *)malloc(bufspace);
187 if (msgp->msg_control == NULL) {
188 Fprintf(stderr, "%s: malloc %s\n", prog, strerror(errno));
189 exit(EXIT_FAILURE);
190 }
191 cmsgp = CMSG_FIRSTHDR(msgp);
192
193 /*
194 * Fill ancillary data. First hoplimit, then rthdr and pktinfo if
195 * needed.
196 */
197
198 /* set hoplimit ancillary data */
199 cmsgp->cmsg_level = IPPROTO_IPV6;
200 cmsgp->cmsg_type = IPV6_HOPLIMIT;
201 cmsg_datap = CMSG_DATA(cmsgp);
202 /* LINTED E_BAD_PTR_CAST_ALIGN */
203 *(int *)cmsg_datap = hoplimit;
204 cmsgp->cmsg_len = cmsg_datap + hoplimit_space - (uchar_t *)cmsgp;
205 cmsgp = CMSG_NXTHDR(msgp, cmsgp);
206
207 /* set rthdr ancillary data if needed */
208 if (gw_cnt > 0) {
209 struct ip6_rthdr0 *rthdr0p;
210
211 cmsgp->cmsg_level = IPPROTO_IPV6;
212 cmsgp->cmsg_type = IPV6_RTHDR;
213 cmsg_datap = CMSG_DATA(cmsgp);
214
215 /*
216 * Initialize rthdr structure
217 */
218 /* LINTED E_BAD_PTR_CAST_ALIGN */
219 rthdr0p = (struct ip6_rthdr0 *)cmsg_datap;
220 if (inet6_rth_init(rthdr0p, rthdr_space,
221 IPV6_RTHDR_TYPE_0, gw_cnt) == NULL) {
222 Fprintf(stderr, "%s: inet6_rth_init failed\n",
223 prog);
224 exit(EXIT_FAILURE);
225 }
226
227 /*
228 * Stuff in gateway addresses
229 */
230 for (i = 0; i < gw_cnt; i++) {
231 if (inet6_rth_add(rthdr0p,
232 &gwIPlist[i].addr6) == -1) {
233 Fprintf(stderr,
234 "%s: inet6_rth_add\n", prog);
235 exit(EXIT_FAILURE);
236 }
237 }
238
239 cmsgp->cmsg_len = cmsg_datap + rthdr_space - (uchar_t *)cmsgp;
240 cmsgp = CMSG_NXTHDR(msgp, cmsgp);
241 }
242
243 /* set pktinfo ancillary data if needed */
244 if (if_index != 0) {
245 struct in6_pktinfo *pktinfop;
246
247 cmsgp->cmsg_level = IPPROTO_IPV6;
248 cmsgp->cmsg_type = IPV6_PKTINFO;
249 cmsg_datap = CMSG_DATA(cmsgp);
250
251 /* LINTED E_BAD_PTR_CAST_ALIGN */
252 pktinfop = (struct in6_pktinfo *)cmsg_datap;
253 /*
254 * We don't know if pktinfop->ipi6_addr is aligned properly,
255 * therefore let's use bcopy, instead of assignment.
256 */
257 (void) bcopy(&in6addr_any, &pktinfop->ipi6_addr,
258 sizeof (struct in6_addr));
259
260 /*
261 * We can assume pktinfop->ipi6_ifindex is 32 bit aligned.
262 */
263 pktinfop->ipi6_ifindex = if_index;
264 cmsgp->cmsg_len = cmsg_datap + pktinfo_space - (uchar_t *)cmsgp;
265 cmsgp = CMSG_NXTHDR(msgp, cmsgp);
266 }
267
268 msgp->msg_controllen = (char *)cmsgp - (char *)msgp->msg_control;
269 }
270
271 /*
272 * Parses the given msg->msg_control to find the IPV6_HOPLIMIT ancillary data
273 * and update the hoplimit.
274 * Returns _B_FALSE if it can't find IPV6_HOPLIMIT ancillary data, _B_TRUE
275 * otherwise.
276 */
277 static boolean_t
update_hoplimit_ancillary_data(struct msghdr * msg,int hoplimit)278 update_hoplimit_ancillary_data(struct msghdr *msg, int hoplimit)
279 {
280 struct cmsghdr *cmsg;
281 int *intp;
282
283 for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL;
284 cmsg = CMSG_NXTHDR(msg, cmsg)) {
285 if (cmsg->cmsg_level == IPPROTO_IPV6 &&
286 cmsg->cmsg_type == IPV6_HOPLIMIT) {
287 /* LINTED E_BAD_PTR_CAST_ALIGN */
288 intp = (int *)(CMSG_DATA(cmsg));
289 *intp = hoplimit;
290 return (_B_TRUE);
291 }
292 }
293
294 return (_B_FALSE);
295 }
296
297 /*
298 * send a probe packet to the destination
299 */
300 void
send_probe6(int sndsock,struct msghdr * msg6,struct ip * outip,int seq,int ttl,struct timeval * tp,int packlen)301 send_probe6(int sndsock, struct msghdr *msg6, struct ip *outip, int seq,
302 int ttl, struct timeval *tp, int packlen)
303 {
304 uchar_t *outp;
305 struct icmp *outicmp;
306 struct outdata *outdata;
307 struct iovec iov;
308 int cc;
309 int optlen = 0;
310 int send_size;
311 struct sockaddr_in6 *to6;
312
313 if (gw_count > 0) {
314 /* ip6_rthdr0 structure includes one gateway address */
315 optlen = sizeof (struct ip6_rthdr0) +
316 gw_count * sizeof (struct in6_addr);
317 }
318
319 send_size = packlen - sizeof (struct ip6_hdr) - optlen;
320
321 /* if using UDP, further discount UDP header size */
322 if (!useicmp)
323 send_size -= sizeof (struct udphdr);
324
325 /* initialize buffer pointers */
326 outp = (uchar_t *)(outip + 1);
327 /* LINTED E_BAD_PTR_CAST_ALIGN */
328 outicmp = (struct icmp *)outp;
329 /* LINTED E_BAD_PTR_CAST_ALIGN */
330 outdata = (struct outdata *)(outp + ICMP6_MINLEN);
331
332 if (!update_hoplimit_ancillary_data(msg6, ttl)) {
333 Fprintf(stderr,
334 "%s: can't find IPV6_HOPLIMIT ancillary data\n", prog);
335 exit(EXIT_FAILURE);
336 }
337
338 /* Payload */
339 outdata->seq = seq;
340 outdata->ttl = ttl;
341 outdata->tv = *tp;
342
343 if (useicmp) {
344 outicmp->icmp_seq = htons(seq);
345 } else {
346 to6 = (struct sockaddr_in6 *)msg6->msg_name;
347 to6->sin6_port = htons((port + seq) % (MAX_PORT + 1));
348 }
349
350 iov.iov_base = outp;
351 iov.iov_len = send_size;
352
353 msg6->msg_iov = &iov;
354 msg6->msg_iovlen = 1;
355
356 cc = sendmsg(sndsock, msg6, 0);
357
358 if (cc < 0 || cc != send_size) {
359 if (cc < 0) {
360 Fprintf(stderr, "%s: sendmsg: %s\n", prog,
361 strerror(errno));
362 }
363 Printf("%s: wrote %s %d chars, ret=%d\n",
364 prog, hostname, send_size, cc);
365 (void) fflush(stdout);
366 }
367 }
368
369 /*
370 * Return a pointer to the ancillary data for the given cmsg_level and
371 * cmsg_type.
372 * If not found return NULL.
373 */
374 void *
find_ancillary_data(struct msghdr * msg,int cmsg_level,int cmsg_type)375 find_ancillary_data(struct msghdr *msg, int cmsg_level, int cmsg_type)
376 {
377 struct cmsghdr *cmsg;
378
379 for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL;
380 cmsg = CMSG_NXTHDR(msg, cmsg)) {
381 if (cmsg->cmsg_level == cmsg_level &&
382 cmsg->cmsg_type == cmsg_type) {
383 return (CMSG_DATA(cmsg));
384 }
385 }
386 return (NULL);
387 }
388
389 /*
390 * Check out the reply packet to see if it's what we were expecting.
391 * Returns REPLY_GOT_TARGET if the reply comes from the target
392 * REPLY_GOT_GATEWAY if an intermediate gateway sends TIME_EXCEEDED
393 * REPLY_GOT_OTHER for other kinds of unreachables indicating none of
394 * the above two cases
395 *
396 * It also sets the icmp type and icmp code values
397 */
398 int
check_reply6(struct msghdr * msg,int cc,int seq,uchar_t * type,uchar_t * code)399 check_reply6(struct msghdr *msg, int cc, int seq, uchar_t *type, uchar_t *code)
400 {
401 uchar_t *buf = msg->msg_iov->iov_base;
402 struct sockaddr_in6 *from_in6 = (struct sockaddr_in6 *)msg->msg_name;
403 icmp6_t *icp6;
404 ulong_t ip6hdr_len;
405 uint8_t last_hdr;
406 int save_cc = cc;
407 char temp_buf[INET6_ADDRSTRLEN]; /* use for inet_ntop() */
408
409 /* Ignore packets > 64k or control buffers that don't fit */
410 if (msg->msg_flags & (MSG_TRUNC|MSG_CTRUNC)) {
411 if (verbose) {
412 Printf("Truncated message: msg_flags 0x%x from %s\n",
413 msg->msg_flags,
414 inet_ntop(AF_INET6,
415 (void *)&(from_in6->sin6_addr),
416 temp_buf, sizeof (temp_buf)));
417 }
418 return (REPLY_SHORT_PKT);
419 }
420 if (cc < ICMP6_MINLEN) {
421 if (verbose) {
422 Printf("packet too short (%d bytes) from %s\n",
423 cc,
424 inet_ntop(AF_INET6,
425 (void *)&(from_in6->sin6_addr),
426 temp_buf, sizeof (temp_buf)));
427 }
428 return (REPLY_SHORT_PKT);
429 }
430 /* LINTED E_BAD_PTR_CAST_ALIGN */
431 icp6 = (icmp6_t *)buf;
432 *type = icp6->icmp6_type;
433 *code = icp6->icmp6_code;
434
435 /*
436 * traceroute interprets only ICMP6_TIME_EXCEED_TRANSIT,
437 * ICMP6_DST_UNREACH, ICMP6_ECHO_REPLY, ICMP6_PACKET_TOO_BIG and
438 * ICMP6_PARAMPROB_NEXTHEADER, ignores others
439 */
440 if ((*type == ICMP6_TIME_EXCEEDED &&
441 *code == ICMP6_TIME_EXCEED_TRANSIT) ||
442 *type == ICMP6_DST_UNREACH || *type == ICMP6_ECHO_REPLY ||
443 *type == ICMP6_PACKET_TOO_BIG ||
444 (*type == ICMP6_PARAM_PROB &&
445 *code == ICMP6_PARAMPROB_NEXTHEADER)) {
446 ip6_t *hip6;
447 struct udphdr *up;
448 icmp6_t *hicmp6;
449
450 cc -= ICMP6_MINLEN;
451 hip6 = (ip6_t *)&(icp6->icmp6_data32[1]);
452 last_hdr = hip6->ip6_nxt;
453 ip6hdr_len = IPv6_hdrlen(hip6, cc, &last_hdr);
454
455 cc -= ip6hdr_len;
456 if (useicmp) {
457 if (*type == ICMP6_ECHO_REPLY &&
458 icp6->icmp6_id == htons(ident) &&
459 icp6->icmp6_seq == htons(seq)) {
460 return (REPLY_GOT_TARGET);
461 }
462
463 /* LINTED E_BAD_PTR_CAST_ALIGN */
464 hicmp6 = (icmp6_t *)((uchar_t *)hip6 + ip6hdr_len);
465
466 if (ICMP6_MINLEN <= cc &&
467 last_hdr == IPPROTO_ICMPV6 &&
468 hicmp6->icmp6_id == htons(ident) &&
469 hicmp6->icmp6_seq == htons(seq)) {
470 if (*type == ICMP6_TIME_EXCEEDED) {
471 return (REPLY_GOT_GATEWAY);
472 } else {
473 return (REPLY_GOT_OTHER);
474 }
475 }
476 } else {
477 /* LINTED E_BAD_PTR_CAST_ALIGN */
478 up = (struct udphdr *)((uchar_t *)hip6 + ip6hdr_len);
479 /*
480 * at least 4 bytes of UDP header is required for this
481 * check
482 */
483 if (4 <= cc &&
484 last_hdr == IPPROTO_UDP &&
485 up->uh_sport == htons(ident) &&
486 up->uh_dport == htons((port + seq) %
487 (MAX_PORT + 1))) {
488 if (*type == ICMP6_DST_UNREACH &&
489 *code == ICMP6_DST_UNREACH_NOPORT) {
490 return (REPLY_GOT_TARGET);
491 } else if (*type == ICMP6_TIME_EXCEEDED) {
492 return (REPLY_GOT_GATEWAY);
493 } else {
494 return (REPLY_GOT_OTHER);
495 }
496 }
497 }
498 }
499
500 if (verbose) {
501 int i, j;
502 uchar_t *lp = (uchar_t *)icp6;
503 struct in6_addr *dst;
504 struct in6_pktinfo *pkti;
505
506 pkti = (struct in6_pktinfo *)find_ancillary_data(msg,
507 IPPROTO_IPV6, IPV6_PKTINFO);
508 if (pkti == NULL) {
509 Fprintf(stderr,
510 "%s: can't find IPV6_PKTINFO ancillary data\n",
511 prog);
512 exit(EXIT_FAILURE);
513 }
514 dst = &pkti->ipi6_addr;
515 cc = save_cc;
516 Printf("\n%d bytes from %s to ", cc,
517 inet_ntop(AF_INET6, (const void *)&(from_in6->sin6_addr),
518 temp_buf, sizeof (temp_buf)));
519 Printf("%s: icmp type %d (%s) code %d\n",
520 inet_ntop(AF_INET6, (const void *)dst,
521 temp_buf, sizeof (temp_buf)),
522 *type, pr_type6(*type), *code);
523 for (i = 0; i < cc; i += 4) {
524 Printf("%2d: x", i);
525 for (j = 0; ((j < 4) && ((i + j) < cc)); j++)
526 Printf("%2.2x", *lp++);
527 (void) putchar('\n');
528 }
529 }
530
531 return (REPLY_SHORT_PKT);
532 }
533
534 /*
535 * Return the length of the IPv6 related headers (including extension headers)
536 */
537 static int
IPv6_hdrlen(ip6_t * ip6h,int pkt_len,uint8_t * last_hdr_rtrn)538 IPv6_hdrlen(ip6_t *ip6h, int pkt_len, uint8_t *last_hdr_rtrn)
539 {
540 int length;
541 int exthdrlength;
542 uint8_t nexthdr;
543 uint8_t *whereptr;
544 ip6_hbh_t *hbhhdr;
545 ip6_dest_t *desthdr;
546 ip6_rthdr_t *rthdr;
547 ip6_frag_t *fraghdr;
548 uint8_t *endptr;
549
550 length = sizeof (ip6_t);
551
552 whereptr = ((uint8_t *)&ip6h[1]); /* point to next hdr */
553 endptr = ((uint8_t *)ip6h) + pkt_len;
554
555 nexthdr = ip6h->ip6_nxt;
556 *last_hdr_rtrn = IPPROTO_NONE;
557
558 if (whereptr >= endptr)
559 return (length);
560
561 while (whereptr < endptr) {
562 *last_hdr_rtrn = nexthdr;
563 switch (nexthdr) {
564 case IPPROTO_HOPOPTS:
565 hbhhdr = (ip6_hbh_t *)whereptr;
566 exthdrlength = 8 * (hbhhdr->ip6h_len + 1);
567 if ((uchar_t *)hbhhdr + exthdrlength > endptr)
568 return (length);
569 nexthdr = hbhhdr->ip6h_nxt;
570 length += exthdrlength;
571 break;
572
573 case IPPROTO_DSTOPTS:
574 desthdr = (ip6_dest_t *)whereptr;
575 exthdrlength = 8 * (desthdr->ip6d_len + 1);
576 if ((uchar_t *)desthdr + exthdrlength > endptr)
577 return (length);
578 nexthdr = desthdr->ip6d_nxt;
579 length += exthdrlength;
580 break;
581
582 case IPPROTO_ROUTING:
583 rthdr = (ip6_rthdr_t *)whereptr;
584 exthdrlength = 8 * (rthdr->ip6r_len + 1);
585 if ((uchar_t *)rthdr + exthdrlength > endptr)
586 return (length);
587 nexthdr = rthdr->ip6r_nxt;
588 length += exthdrlength;
589 break;
590
591 case IPPROTO_FRAGMENT:
592 /* LINTED E_BAD_PTR_CAST_ALIGN */
593 fraghdr = (ip6_frag_t *)whereptr;
594 if ((uchar_t *)&fraghdr[1] > endptr)
595 return (length);
596 nexthdr = fraghdr->ip6f_nxt;
597 length += sizeof (struct ip6_frag);
598 break;
599
600 case IPPROTO_NONE:
601 default:
602 return (length);
603 }
604 whereptr = (uint8_t *)ip6h + length;
605 }
606 *last_hdr_rtrn = nexthdr;
607
608 return (length);
609 }
610
611 /*
612 * convert an ICMP6 "type" field to a printable string.
613 */
614 static char *
pr_type6(uchar_t type)615 pr_type6(uchar_t type)
616 {
617 static struct icmptype_table ttab6[] = {
618 {ICMP6_DST_UNREACH, "Dest Unreachable"},
619 {ICMP6_PACKET_TOO_BIG, "Packet Too Big"},
620 {ICMP6_TIME_EXCEEDED, "Time Exceeded"},
621 {ICMP6_PARAM_PROB, "Param Problem"},
622 {ICMP6_ECHO_REQUEST, "Echo Request"},
623 {ICMP6_ECHO_REPLY, "Echo Reply"},
624 {MLD_LISTENER_QUERY, "Multicast Listener Query"},
625 {MLD_LISTENER_REPORT, "Multicast Listener Report"},
626 {MLD_LISTENER_REDUCTION, "Multicast Listener Done"},
627 {ND_ROUTER_SOLICIT, "Router Solicitation"},
628 {ND_ROUTER_ADVERT, "Router Advertisement"},
629 {ND_NEIGHBOR_SOLICIT, "Neighbor Solicitation"},
630 {ND_NEIGHBOR_ADVERT, "Neighbor Advertisement"},
631 {ND_REDIRECT, "Redirect Message"}
632 };
633 int i = 0;
634
635 for (i = 0; i < A_CNT(ttab6); i++) {
636 if (ttab6[i].type == type)
637 return (ttab6[i].message);
638 }
639
640 return ("OUT-OF-RANGE");
641 }
642
643
644 /*
645 * print the IPv6 src address of the reply packet
646 */
647 void
print_addr6(uchar_t * buf,int cc,struct sockaddr * from)648 print_addr6(uchar_t *buf, int cc, struct sockaddr *from)
649 {
650 /* LINTED E_BAD_PTR_CAST_ALIGN */
651 struct sockaddr_in6 *from_in6 = (struct sockaddr_in6 *)from;
652 ip6_t *ip;
653 union any_in_addr ip_addr;
654 char *resolved_name;
655 char temp_buf[INET6_ADDRSTRLEN]; /* use for inet_ntop() */
656
657 ip_addr.addr6 = from_in6->sin6_addr;
658
659 /* LINTED E_BAD_PTR_CAST_ALIGN */
660 ip = (ip6_t *)buf;
661
662 (void) inet_ntop(AF_INET6, &(from_in6->sin6_addr), temp_buf,
663 sizeof (temp_buf));
664 if (!nflag)
665 resolved_name = inet_name(&ip_addr, AF_INET6);
666 /*
667 * If the IPv6 address cannot be resolved to hostname, inet_name()
668 * returns the IPv6 address as a string. In that case, we choose not
669 * to print it twice. This saves us space on display.
670 */
671 if (nflag || (strcmp(temp_buf, resolved_name) == 0))
672 Printf(" %s", temp_buf);
673 else
674 Printf(" %s (%s)", resolved_name, temp_buf);
675
676 if (verbose) {
677 Printf(" %d bytes to %s", cc, inet_ntop(AF_INET6,
678 (const void *) &(ip->ip6_dst), temp_buf,
679 sizeof (temp_buf)));
680 }
681 }
682
683 /*
684 * ICMP6 messages which doesn't mean we got the target, or we got a gateway, are
685 * processed here. It returns _B_TRUE if it's some sort of 'unreachable'.
686 */
687 boolean_t
print_icmp_other6(uchar_t type,uchar_t code)688 print_icmp_other6(uchar_t type, uchar_t code)
689 {
690 boolean_t unreach = _B_FALSE;
691
692 switch (type) {
693
694 /* this corresponds to "ICMP_UNREACH_NEEDFRAG" in ICMP */
695 case ICMP6_PACKET_TOO_BIG:
696 unreach = _B_TRUE;
697 Printf(" !B");
698 break;
699
700 case ICMP6_PARAM_PROB:
701 /* this corresponds to "ICMP_UNREACH_PROTOCOL" in ICMP */
702 if (code == ICMP6_PARAMPROB_NEXTHEADER) {
703 unreach = _B_TRUE;
704 Printf(" !R");
705 }
706 break;
707
708 case ICMP6_DST_UNREACH:
709 switch (code) {
710 case ICMP6_DST_UNREACH_NOPORT:
711 break;
712
713 case ICMP6_DST_UNREACH_NOROUTE:
714 unreach = _B_TRUE;
715 Printf(" !H");
716 break;
717
718 case ICMP6_DST_UNREACH_ADMIN:
719 unreach = _B_TRUE;
720 Printf(" !X");
721 break;
722
723 case ICMP6_DST_UNREACH_ADDR:
724 unreach = _B_TRUE;
725 Printf(" !A");
726 break;
727
728 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
729 unreach = _B_TRUE;
730 Printf(" !E");
731 break;
732
733 default:
734 unreach = _B_TRUE;
735 Printf(" !<%d>", code);
736 break;
737 }
738 break;
739 default:
740 break;
741 }
742
743 return (unreach);
744 }
745