1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22 #ifndef lint
23 static const char rcsid[] _U_ =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-icmp6.c,v 1.79.2.6 2005/09/05 09:29:28 guy Exp $";
25 #endif
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #ifdef INET6
32
33 #include <tcpdump-stdinc.h>
34
35 #include <stdio.h>
36 #include <string.h>
37
38 #include "interface.h"
39 #include "addrtoname.h"
40 #include "extract.h"
41
42 #include "ip6.h"
43 #include "icmp6.h"
44 #include "ipproto.h"
45
46 #include "udp.h"
47 #include "ah.h"
48
49 static const char *get_rtpref(u_int);
50 static const char *get_lifetime(u_int32_t);
51 static void print_lladdr(const u_char *, size_t);
52 static void icmp6_opt_print(const u_char *, int);
53 static void mld6_print(const u_char *);
54 static void mldv2_report_print(const u_char *, u_int);
55 static void mldv2_query_print(const u_char *, u_int);
56 static struct udphdr *get_upperlayer(u_char *, u_int *);
57 static void dnsname_print(const u_char *, const u_char *);
58 static void icmp6_nodeinfo_print(u_int, const u_char *, const u_char *);
59 static void icmp6_rrenum_print(const u_char *, const u_char *);
60
61 #ifndef abs
62 #define abs(a) ((0 < (a)) ? (a) : -(a))
63 #endif
64
65 static struct tok icmp6_type_values[] = {
66 { ICMP6_DST_UNREACH, "destination unreachable"},
67 { ICMP6_PACKET_TOO_BIG, "packet too big"},
68 { ICMP6_TIME_EXCEEDED, "time exceeded in-transit"},
69 { ICMP6_PARAM_PROB, "parameter problem"},
70 { ICMP6_ECHO_REQUEST, "echo request"},
71 { ICMP6_ECHO_REPLY, "echo reply"},
72 { MLD6_LISTENER_QUERY, "multicast listener query"},
73 { MLD6_LISTENER_REPORT, "multicast listener report"},
74 { MLD6_LISTENER_DONE, "multicast listener done"},
75 { ND_ROUTER_SOLICIT, "router solicitation"},
76 { ND_ROUTER_ADVERT, "router advertisement"},
77 { ND_NEIGHBOR_SOLICIT, "neighbor solicitation"},
78 { ND_NEIGHBOR_ADVERT, "neighbor advertisement"},
79 { ND_REDIRECT, "redirect"},
80 { ICMP6_ROUTER_RENUMBERING, "router renumbering"},
81 { IND_SOLICIT, "inverse neighbor solicitation"},
82 { IND_ADVERT, "inverse neighbor advertisement"},
83 { MLDV2_LISTENER_REPORT, "multicast listener report v2"},
84 { ICMP6_HADISCOV_REQUEST, "ha discovery request"},
85 { ICMP6_HADISCOV_REPLY, "ha discovery reply"},
86 { ICMP6_MOBILEPREFIX_SOLICIT, "mobile router solicitation"},
87 { ICMP6_MOBILEPREFIX_ADVERT, "mobile router advertisement"},
88 { ICMP6_WRUREQUEST, "who-are-you request"},
89 { ICMP6_WRUREPLY, "who-are-you reply"},
90 { ICMP6_NI_QUERY, "node information query"},
91 { ICMP6_NI_REPLY, "node information reply"},
92 { MLD6_MTRACE, "mtrace message"},
93 { MLD6_MTRACE_RESP, "mtrace response"},
94 { 0, NULL }
95 };
96
97 static struct tok icmp6_dst_unreach_code_values[] = {
98 { ICMP6_DST_UNREACH_NOROUTE, "unreachable route" },
99 { ICMP6_DST_UNREACH_ADMIN, " unreachable prohibited"},
100 { ICMP6_DST_UNREACH_BEYONDSCOPE, "beyond scope"},
101 { ICMP6_DST_UNREACH_ADDR, "unreachable address"},
102 { ICMP6_DST_UNREACH_NOPORT, "unreachable port"},
103 { 0, NULL }
104 };
105
106 static struct tok icmp6_opt_pi_flag_values[] = {
107 { ND_OPT_PI_FLAG_ONLINK, "onlink" },
108 { ND_OPT_PI_FLAG_AUTO, "auto" },
109 { ND_OPT_PI_FLAG_ROUTER, "router" },
110 { 0, NULL }
111 };
112
113 static struct tok icmp6_opt_ra_flag_values[] = {
114 { ND_RA_FLAG_MANAGED, "managed" },
115 { ND_RA_FLAG_OTHER, "other stateful"},
116 { ND_RA_FLAG_HOME_AGENT, "home agent"},
117 { 0, NULL }
118 };
119
120 static struct tok icmp6_nd_na_flag_values[] = {
121 { ND_NA_FLAG_ROUTER, "router" },
122 { ND_NA_FLAG_SOLICITED, "solicited" },
123 { ND_NA_FLAG_OVERRIDE, "override" },
124 { 0, NULL }
125 };
126
127
128 static struct tok icmp6_opt_values[] = {
129 { ND_OPT_SOURCE_LINKADDR, "source link-address"},
130 { ND_OPT_TARGET_LINKADDR, "destination link-address"},
131 { ND_OPT_PREFIX_INFORMATION, "prefix info"},
132 { ND_OPT_REDIRECTED_HEADER, "redirected header"},
133 { ND_OPT_MTU, "mtu"},
134 { ND_OPT_ADVINTERVAL, "advertisement interval"},
135 { ND_OPT_HOMEAGENT_INFO, "homeagent information"},
136 { ND_OPT_ROUTE_INFO, "route info"},
137 { 0, NULL }
138 };
139
140 /* mldv2 report types */
141 static struct tok mldv2report2str[] = {
142 { 1, "is_in" },
143 { 2, "is_ex" },
144 { 3, "to_in" },
145 { 4, "to_ex" },
146 { 5, "allow" },
147 { 6, "block" },
148 { 0, NULL }
149 };
150
151 static const char *
get_rtpref(u_int v)152 get_rtpref(u_int v)
153 {
154 static const char *rtpref_str[] = {
155 "medium", /* 00 */
156 "high", /* 01 */
157 "rsv", /* 10 */
158 "low" /* 11 */
159 };
160
161 return rtpref_str[((v & ND_RA_FLAG_RTPREF_MASK) >> 3) & 0xff];
162 }
163
164 static const char *
get_lifetime(u_int32_t v)165 get_lifetime(u_int32_t v)
166 {
167 static char buf[20];
168
169 if (v == (u_int32_t)~0UL)
170 return "infinity";
171 else {
172 snprintf(buf, sizeof(buf), "%u", v);
173 return buf;
174 }
175 }
176
177 static void
print_lladdr(const u_int8_t * p,size_t l)178 print_lladdr(const u_int8_t *p, size_t l)
179 {
180 const u_int8_t *ep, *q;
181
182 q = p;
183 ep = p + l;
184 while (l > 0 && q < ep) {
185 if (q > p)
186 printf(":");
187 printf("%02x", *q++);
188 l--;
189 }
190 }
191
icmp6_cksum(const struct ip6_hdr * ip6,const struct icmp6_hdr * icp,u_int len)192 static int icmp6_cksum(const struct ip6_hdr *ip6, const struct icmp6_hdr *icp,
193 u_int len)
194 {
195 size_t i;
196 register const u_int16_t *sp;
197 u_int32_t sum;
198 union {
199 struct {
200 struct in6_addr ph_src;
201 struct in6_addr ph_dst;
202 u_int32_t ph_len;
203 u_int8_t ph_zero[3];
204 u_int8_t ph_nxt;
205 } ph;
206 u_int16_t pa[20];
207 } phu;
208
209 /* pseudo-header */
210 memset(&phu, 0, sizeof(phu));
211 phu.ph.ph_src = ip6->ip6_src;
212 phu.ph.ph_dst = ip6->ip6_dst;
213 phu.ph.ph_len = htonl(len);
214 phu.ph.ph_nxt = IPPROTO_ICMPV6;
215
216 sum = 0;
217 for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
218 sum += phu.pa[i];
219
220 sp = (const u_int16_t *)icp;
221
222 for (i = 0; i < (len & ~1); i += 2)
223 sum += *sp++;
224
225 if (len & 1)
226 sum += htons((*(const u_int8_t *)sp) << 8);
227
228 while (sum > 0xffff)
229 sum = (sum & 0xffff) + (sum >> 16);
230 sum = ~sum & 0xffff;
231
232 return (sum);
233 }
234
235 void
icmp6_print(const u_char * bp,u_int length,const u_char * bp2,int fragmented)236 icmp6_print(const u_char *bp, u_int length, const u_char *bp2, int fragmented)
237 {
238 const struct icmp6_hdr *dp;
239 const struct ip6_hdr *ip;
240 const struct ip6_hdr *oip;
241 const struct udphdr *ouh;
242 int dport;
243 const u_char *ep;
244 u_int prot;
245
246 dp = (struct icmp6_hdr *)bp;
247 ip = (struct ip6_hdr *)bp2;
248 oip = (struct ip6_hdr *)(dp + 1);
249 /* 'ep' points to the end of available data. */
250 ep = snapend;
251
252 TCHECK(dp->icmp6_cksum);
253
254 if (vflag && !fragmented) {
255 int sum = dp->icmp6_cksum;
256
257 if (TTEST2(bp[0], length)) {
258 sum = icmp6_cksum(ip, dp, length);
259 if (sum != 0)
260 (void)printf("[bad icmp6 cksum %x!] ", sum);
261 else
262 (void)printf("[icmp6 sum ok] ");
263 }
264 }
265
266 printf("ICMP6, %s", tok2str(icmp6_type_values,"unknown icmp6 type (%u)",dp->icmp6_type));
267
268 /* display cosmetics: print the packet length for printer that use the vflag now */
269 if (vflag && (dp->icmp6_type ==
270 ND_ROUTER_SOLICIT ||
271 ND_ROUTER_ADVERT ||
272 ND_NEIGHBOR_ADVERT ||
273 ND_NEIGHBOR_SOLICIT ||
274 ND_REDIRECT ||
275 ICMP6_HADISCOV_REPLY ||
276 ICMP6_MOBILEPREFIX_ADVERT ))
277 printf(", length %u", length);
278
279 switch (dp->icmp6_type) {
280 case ICMP6_DST_UNREACH:
281 TCHECK(oip->ip6_dst);
282 printf(", %s", tok2str(icmp6_dst_unreach_code_values,"unknown unreach code (%u)",dp->icmp6_code));
283 switch (dp->icmp6_code) {
284
285 case ICMP6_DST_UNREACH_NOROUTE: /* fall through */
286 case ICMP6_DST_UNREACH_ADMIN:
287 case ICMP6_DST_UNREACH_ADDR:
288 printf(" %s",ip6addr_string(&oip->ip6_dst));
289 break;
290 case ICMP6_DST_UNREACH_BEYONDSCOPE:
291 printf(" %s, source address %s",
292 ip6addr_string(&oip->ip6_dst),
293 ip6addr_string(&oip->ip6_src));
294 break;
295 case ICMP6_DST_UNREACH_NOPORT:
296 if ((ouh = get_upperlayer((u_char *)oip, &prot))
297 == NULL)
298 goto trunc;
299
300 dport = EXTRACT_16BITS(&ouh->uh_dport);
301 switch (prot) {
302 case IPPROTO_TCP:
303 printf(", %s tcp port %s",
304 ip6addr_string(&oip->ip6_dst),
305 tcpport_string(dport));
306 break;
307 case IPPROTO_UDP:
308 printf(", %s udp port %s",
309 ip6addr_string(&oip->ip6_dst),
310 udpport_string(dport));
311 break;
312 default:
313 printf(", %s protocol %d port %d unreachable",
314 ip6addr_string(&oip->ip6_dst),
315 oip->ip6_nxt, dport);
316 break;
317 }
318 break;
319 default:
320 if (vflag <= 1) {
321 print_unknown_data(bp,"\n\t",length);
322 return;
323 }
324 break;
325 }
326 break;
327 case ICMP6_PACKET_TOO_BIG:
328 TCHECK(dp->icmp6_mtu);
329 printf(", mtu %u", EXTRACT_32BITS(&dp->icmp6_mtu));
330 break;
331 case ICMP6_TIME_EXCEEDED:
332 TCHECK(oip->ip6_dst);
333 switch (dp->icmp6_code) {
334 case ICMP6_TIME_EXCEED_TRANSIT:
335 printf(" for %s",
336 ip6addr_string(&oip->ip6_dst));
337 break;
338 case ICMP6_TIME_EXCEED_REASSEMBLY:
339 printf(" (reassembly)");
340 break;
341 default:
342 printf(", unknown code (%u)", dp->icmp6_code);
343 break;
344 }
345 break;
346 case ICMP6_PARAM_PROB:
347 TCHECK(oip->ip6_dst);
348 switch (dp->icmp6_code) {
349 case ICMP6_PARAMPROB_HEADER:
350 printf(", errorneous - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
351 break;
352 case ICMP6_PARAMPROB_NEXTHEADER:
353 printf(", next header - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
354 break;
355 case ICMP6_PARAMPROB_OPTION:
356 printf(", option - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
357 break;
358 default:
359 printf(", code-#%d",
360 dp->icmp6_code);
361 break;
362 }
363 break;
364 case ICMP6_ECHO_REQUEST:
365 case ICMP6_ECHO_REPLY:
366 TCHECK(dp->icmp6_seq);
367 printf(", seq %u", EXTRACT_16BITS(&dp->icmp6_seq));
368 break;
369 case ICMP6_MEMBERSHIP_QUERY:
370 if (length == MLD_MINLEN) {
371 mld6_print((const u_char *)dp);
372 } else if (length >= MLDV2_MINLEN) {
373 printf("v2 ");
374 mldv2_query_print((const u_char *)dp, length);
375 } else {
376 printf(" unknown-version (len %u) ", length);
377 }
378 break;
379 case ICMP6_MEMBERSHIP_REPORT:
380 mld6_print((const u_char *)dp);
381 break;
382 case ICMP6_MEMBERSHIP_REDUCTION:
383 mld6_print((const u_char *)dp);
384 break;
385 case ND_ROUTER_SOLICIT:
386 #define RTSOLLEN 8
387 if (vflag) {
388 icmp6_opt_print((const u_char *)dp + RTSOLLEN,
389 length - RTSOLLEN);
390 }
391 break;
392 case ND_ROUTER_ADVERT:
393 #define RTADVLEN 16
394 if (vflag) {
395 struct nd_router_advert *p;
396
397 p = (struct nd_router_advert *)dp;
398 TCHECK(p->nd_ra_retransmit);
399 printf("\n\thop limit %u, Flags [%s]" \
400 ", pref %s, router lifetime %us, reachable time %us, retrans time %us",
401 (u_int)p->nd_ra_curhoplimit,
402 bittok2str(icmp6_opt_ra_flag_values,"none",(p->nd_ra_flags_reserved)),
403 get_rtpref(p->nd_ra_flags_reserved),
404 EXTRACT_16BITS(&p->nd_ra_router_lifetime),
405 EXTRACT_32BITS(&p->nd_ra_reachable),
406 EXTRACT_32BITS(&p->nd_ra_retransmit));
407
408 icmp6_opt_print((const u_char *)dp + RTADVLEN,
409 length - RTADVLEN);
410 }
411 break;
412 case ND_NEIGHBOR_SOLICIT:
413 {
414 struct nd_neighbor_solicit *p;
415 p = (struct nd_neighbor_solicit *)dp;
416 TCHECK(p->nd_ns_target);
417 printf(", who has %s", ip6addr_string(&p->nd_ns_target));
418 if (vflag) {
419 #define NDSOLLEN 24
420 icmp6_opt_print((const u_char *)dp + NDSOLLEN,
421 length - NDSOLLEN);
422 }
423 }
424 break;
425 case ND_NEIGHBOR_ADVERT:
426 {
427 struct nd_neighbor_advert *p;
428
429 p = (struct nd_neighbor_advert *)dp;
430 TCHECK(p->nd_na_target);
431 printf(", tgt is %s",
432 ip6addr_string(&p->nd_na_target));
433 if (vflag) {
434 printf(", Flags [%s]",
435 bittok2str(icmp6_nd_na_flag_values,
436 "none",
437 EXTRACT_32BITS(&p->nd_na_flags_reserved)));
438 #define NDADVLEN 24
439 icmp6_opt_print((const u_char *)dp + NDADVLEN,
440 length - NDADVLEN);
441 #undef NDADVLEN
442 }
443 }
444 break;
445 case ND_REDIRECT:
446 #define RDR(i) ((struct nd_redirect *)(i))
447 TCHECK(RDR(dp)->nd_rd_dst);
448 printf(", %s", getname6((const u_char *)&RDR(dp)->nd_rd_dst));
449 TCHECK(RDR(dp)->nd_rd_target);
450 printf(" to %s",
451 getname6((const u_char*)&RDR(dp)->nd_rd_target));
452 #define REDIRECTLEN 40
453 if (vflag) {
454 icmp6_opt_print((const u_char *)dp + REDIRECTLEN,
455 length - REDIRECTLEN);
456 }
457 break;
458 #undef REDIRECTLEN
459 #undef RDR
460 case ICMP6_ROUTER_RENUMBERING:
461 icmp6_rrenum_print(bp, ep);
462 break;
463 case ICMP6_NI_QUERY:
464 case ICMP6_NI_REPLY:
465 icmp6_nodeinfo_print(length, bp, ep);
466 break;
467 case IND_SOLICIT:
468 case IND_ADVERT:
469 break;
470 case ICMP6_V2_MEMBERSHIP_REPORT:
471 mldv2_report_print((const u_char *) dp, length);
472 break;
473 case ICMP6_MOBILEPREFIX_SOLICIT: /* fall through */
474 case ICMP6_HADISCOV_REQUEST:
475 TCHECK(dp->icmp6_data16[0]);
476 printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
477 break;
478 case ICMP6_HADISCOV_REPLY:
479 if (vflag) {
480 struct in6_addr *in6;
481 u_char *cp;
482
483 TCHECK(dp->icmp6_data16[0]);
484 printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
485 cp = (u_char *)dp + length;
486 in6 = (struct in6_addr *)(dp + 1);
487 for (; (u_char *)in6 < cp; in6++) {
488 TCHECK(*in6);
489 printf(", %s", ip6addr_string(in6));
490 }
491 }
492 break;
493 case ICMP6_MOBILEPREFIX_ADVERT:
494 if (vflag) {
495 TCHECK(dp->icmp6_data16[0]);
496 printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
497 if (dp->icmp6_data16[1] & 0xc0)
498 printf(" ");
499 if (dp->icmp6_data16[1] & 0x80)
500 printf("M");
501 if (dp->icmp6_data16[1] & 0x40)
502 printf("O");
503 #define MPADVLEN 8
504 icmp6_opt_print((const u_char *)dp + MPADVLEN,
505 length - MPADVLEN);
506 }
507 break;
508 default:
509 printf(", length %u", length);
510 if (vflag <= 1)
511 print_unknown_data(bp,"\n\t", length);
512 return;
513 }
514 if (!vflag)
515 printf(", length %u", length);
516 return;
517 trunc:
518 fputs("[|icmp6]", stdout);
519 }
520
521 static struct udphdr *
get_upperlayer(u_char * bp,u_int * prot)522 get_upperlayer(u_char *bp, u_int *prot)
523 {
524 const u_char *ep;
525 struct ip6_hdr *ip6 = (struct ip6_hdr *)bp;
526 struct udphdr *uh;
527 struct ip6_hbh *hbh;
528 struct ip6_frag *fragh;
529 struct ah *ah;
530 u_int nh;
531 int hlen;
532
533 /* 'ep' points to the end of available data. */
534 ep = snapend;
535
536 if (!TTEST(ip6->ip6_nxt))
537 return NULL;
538
539 nh = ip6->ip6_nxt;
540 hlen = sizeof(struct ip6_hdr);
541
542 while (bp < ep) {
543 bp += hlen;
544
545 switch(nh) {
546 case IPPROTO_UDP:
547 case IPPROTO_TCP:
548 uh = (struct udphdr *)bp;
549 if (TTEST(uh->uh_dport)) {
550 *prot = nh;
551 return(uh);
552 }
553 else
554 return(NULL);
555 /* NOTREACHED */
556
557 case IPPROTO_HOPOPTS:
558 case IPPROTO_DSTOPTS:
559 case IPPROTO_ROUTING:
560 hbh = (struct ip6_hbh *)bp;
561 if (!TTEST(hbh->ip6h_len))
562 return(NULL);
563 nh = hbh->ip6h_nxt;
564 hlen = (hbh->ip6h_len + 1) << 3;
565 break;
566
567 case IPPROTO_FRAGMENT: /* this should be odd, but try anyway */
568 fragh = (struct ip6_frag *)bp;
569 if (!TTEST(fragh->ip6f_offlg))
570 return(NULL);
571 /* fragments with non-zero offset are meaningless */
572 if ((EXTRACT_16BITS(&fragh->ip6f_offlg) & IP6F_OFF_MASK) != 0)
573 return(NULL);
574 nh = fragh->ip6f_nxt;
575 hlen = sizeof(struct ip6_frag);
576 break;
577
578 case IPPROTO_AH:
579 ah = (struct ah *)bp;
580 if (!TTEST(ah->ah_len))
581 return(NULL);
582 nh = ah->ah_nxt;
583 hlen = (ah->ah_len + 2) << 2;
584 break;
585
586 default: /* unknown or undecodable header */
587 *prot = nh; /* meaningless, but set here anyway */
588 return(NULL);
589 }
590 }
591
592 return(NULL); /* should be notreached, though */
593 }
594
595 static void
icmp6_opt_print(const u_char * bp,int resid)596 icmp6_opt_print(const u_char *bp, int resid)
597 {
598 const struct nd_opt_hdr *op;
599 const struct nd_opt_hdr *opl; /* why there's no struct? */
600 const struct nd_opt_prefix_info *opp;
601 const struct icmp6_opts_redirect *opr;
602 const struct nd_opt_mtu *opm;
603 const struct nd_opt_advinterval *opa;
604 const struct nd_opt_homeagent_info *oph;
605 const struct nd_opt_route_info *opri;
606 const u_char *cp, *ep;
607 struct in6_addr in6, *in6p;
608 size_t l;
609
610 #define ECHECK(var) if ((u_char *)&(var) > ep - sizeof(var)) return
611
612 cp = bp;
613 /* 'ep' points to the end of available data. */
614 ep = snapend;
615
616 while (cp < ep) {
617 op = (struct nd_opt_hdr *)cp;
618
619 ECHECK(op->nd_opt_len);
620 if (resid <= 0)
621 return;
622 if (op->nd_opt_len == 0)
623 goto trunc;
624 if (cp + (op->nd_opt_len << 3) > ep)
625 goto trunc;
626
627 printf("\n\t %s option (%u), length %u (%u): ",
628 tok2str(icmp6_opt_values, "unknown", op->nd_opt_type),
629 op->nd_opt_type,
630 op->nd_opt_len << 3,
631 op->nd_opt_len);
632
633 switch (op->nd_opt_type) {
634 case ND_OPT_SOURCE_LINKADDR:
635 opl = (struct nd_opt_hdr *)op;
636 l = (op->nd_opt_len << 3) - 2;
637 print_lladdr(cp + 2, l);
638 break;
639 case ND_OPT_TARGET_LINKADDR:
640 opl = (struct nd_opt_hdr *)op;
641 l = (op->nd_opt_len << 3) - 2;
642 print_lladdr(cp + 2, l);
643 break;
644 case ND_OPT_PREFIX_INFORMATION:
645 opp = (struct nd_opt_prefix_info *)op;
646 TCHECK(opp->nd_opt_pi_prefix);
647 printf("%s/%u%s, Flags [%s], valid time %ss",
648 ip6addr_string(&opp->nd_opt_pi_prefix),
649 opp->nd_opt_pi_prefix_len,
650 (op->nd_opt_len != 4) ? "badlen" : "",
651 bittok2str(icmp6_opt_pi_flag_values, "none", opp->nd_opt_pi_flags_reserved),
652 get_lifetime(EXTRACT_32BITS(&opp->nd_opt_pi_valid_time)));
653 printf(", pref. time %ss", get_lifetime(EXTRACT_32BITS(&opp->nd_opt_pi_preferred_time)));
654 break;
655 case ND_OPT_REDIRECTED_HEADER:
656 opr = (struct icmp6_opts_redirect *)op;
657 print_unknown_data(bp,"\n\t ",op->nd_opt_len<<3);
658 /* xxx */
659 break;
660 case ND_OPT_MTU:
661 opm = (struct nd_opt_mtu *)op;
662 TCHECK(opm->nd_opt_mtu_mtu);
663 printf(" %u%s",
664 EXTRACT_32BITS(&opm->nd_opt_mtu_mtu),
665 (op->nd_opt_len != 1) ? "bad option length" : "" );
666 break;
667 case ND_OPT_ADVINTERVAL:
668 opa = (struct nd_opt_advinterval *)op;
669 TCHECK(opa->nd_opt_adv_interval);
670 printf(" %us", EXTRACT_32BITS(&opa->nd_opt_adv_interval));
671 break;
672 case ND_OPT_HOMEAGENT_INFO:
673 oph = (struct nd_opt_homeagent_info *)op;
674 TCHECK(oph->nd_opt_hai_lifetime);
675 printf(" preference %u, lifetime %u",
676 EXTRACT_16BITS(&oph->nd_opt_hai_preference),
677 EXTRACT_16BITS(&oph->nd_opt_hai_lifetime));
678 break;
679 case ND_OPT_ROUTE_INFO:
680 opri = (struct nd_opt_route_info *)op;
681 TCHECK(opri->nd_opt_rti_lifetime);
682 memset(&in6, 0, sizeof(in6));
683 in6p = (struct in6_addr *)(opri + 1);
684 switch (op->nd_opt_len) {
685 case 1:
686 break;
687 case 2:
688 TCHECK2(*in6p, 8);
689 memcpy(&in6, opri + 1, 8);
690 break;
691 case 3:
692 TCHECK(*in6p);
693 memcpy(&in6, opri + 1, sizeof(in6));
694 break;
695 default:
696 goto trunc;
697 }
698 printf(" %s/%u", ip6addr_string(&in6),
699 opri->nd_opt_rti_prefixlen);
700 printf(", pref=%s", get_rtpref(opri->nd_opt_rti_flags));
701 printf(", lifetime=%s",
702 get_lifetime(EXTRACT_32BITS(&opri->nd_opt_rti_lifetime)));
703 break;
704 default:
705 if (vflag <= 1) {
706 print_unknown_data(cp+2,"\n\t ", (op->nd_opt_len << 3) - 2); /* skip option header */
707 return;
708 }
709 break;
710 }
711 /* do we want to see an additional hexdump ? */
712 if (vflag> 1)
713 print_unknown_data(cp+2,"\n\t ", (op->nd_opt_len << 3) - 2); /* skip option header */
714
715 cp += op->nd_opt_len << 3;
716 resid -= op->nd_opt_len << 3;
717 }
718 return;
719
720 trunc:
721 fputs("[ndp opt]", stdout);
722 return;
723 #undef ECHECK
724 }
725
726 static void
mld6_print(const u_char * bp)727 mld6_print(const u_char *bp)
728 {
729 struct mld6_hdr *mp = (struct mld6_hdr *)bp;
730 const u_char *ep;
731
732 /* 'ep' points to the end of available data. */
733 ep = snapend;
734
735 if ((u_char *)mp + sizeof(*mp) > ep)
736 return;
737
738 printf("max resp delay: %d ", EXTRACT_16BITS(&mp->mld6_maxdelay));
739 printf("addr: %s", ip6addr_string(&mp->mld6_addr));
740 }
741
742 static void
mldv2_report_print(const u_char * bp,u_int len)743 mldv2_report_print(const u_char *bp, u_int len)
744 {
745 struct icmp6_hdr *icp = (struct icmp6_hdr *) bp;
746 u_int group, nsrcs, ngroups;
747 u_int i, j;
748
749 /* Minimum len is 8 */
750 if (len < 8) {
751 printf(" [invalid len %d]", len);
752 return;
753 }
754
755 TCHECK(icp->icmp6_data16[1]);
756 ngroups = ntohs(icp->icmp6_data16[1]);
757 printf(", %d group record(s)", ngroups);
758 if (vflag > 0) {
759 /* Print the group records */
760 group = 8;
761 for (i = 0; i < ngroups; i++) {
762 /* type(1) + auxlen(1) + numsrc(2) + grp(16) */
763 if (len < group + 20) {
764 printf(" [invalid number of groups]");
765 return;
766 }
767 TCHECK2(bp[group + 4], sizeof(struct in6_addr));
768 printf(" [gaddr %s", ip6addr_string(&bp[group + 4]));
769 printf(" %s", tok2str(mldv2report2str, " [v2-report-#%d]",
770 bp[group]));
771 nsrcs = (bp[group + 2] << 8) + bp[group + 3];
772 /* Check the number of sources and print them */
773 if (len < group + 20 + (nsrcs * sizeof(struct in6_addr))) {
774 printf(" [invalid number of sources %d]", nsrcs);
775 return;
776 }
777 if (vflag == 1)
778 printf(", %d source(s)", nsrcs);
779 else {
780 /* Print the sources */
781 (void)printf(" {");
782 for (j = 0; j < nsrcs; j++) {
783 TCHECK2(bp[group + 20 + j * sizeof(struct in6_addr)],
784 sizeof(struct in6_addr));
785 printf(" %s", ip6addr_string(&bp[group + 20 + j * sizeof(struct in6_addr)]));
786 }
787 (void)printf(" }");
788 }
789 /* Next group record */
790 group += 20 + nsrcs * sizeof(struct in6_addr);
791 printf("]");
792 }
793 }
794 return;
795 trunc:
796 (void)printf("[|icmp6]");
797 return;
798 }
799
800 static void
mldv2_query_print(const u_char * bp,u_int len)801 mldv2_query_print(const u_char *bp, u_int len)
802 {
803 struct icmp6_hdr *icp = (struct icmp6_hdr *) bp;
804 u_int mrc;
805 int mrt, qqi;
806 u_int nsrcs;
807 register u_int i;
808
809 /* Minimum len is 28 */
810 if (len < 28) {
811 printf(" [invalid len %d]", len);
812 return;
813 }
814 TCHECK(icp->icmp6_data16[0]);
815 mrc = ntohs(icp->icmp6_data16[0]);
816 if (mrc < 32768) {
817 mrt = mrc;
818 } else {
819 mrt = ((mrc & 0x0fff) | 0x1000) << (((mrc & 0x7000) >> 12) + 3);
820 }
821 if (vflag) {
822 (void)printf(" [max resp delay=%d]", mrt);
823 }
824 TCHECK2(bp[8], sizeof(struct in6_addr));
825 printf(" [gaddr %s", ip6addr_string(&bp[8]));
826
827 if (vflag) {
828 TCHECK(bp[25]);
829 if (bp[24] & 0x08) {
830 printf(" sflag");
831 }
832 if (bp[24] & 0x07) {
833 printf(" robustness=%d", bp[24] & 0x07);
834 }
835 if (bp[25] < 128) {
836 qqi = bp[25];
837 } else {
838 qqi = ((bp[25] & 0x0f) | 0x10) << (((bp[25] & 0x70) >> 4) + 3);
839 }
840 printf(" qqi=%d", qqi);
841 }
842
843 TCHECK2(bp[26], 2);
844 nsrcs = ntohs(*(u_short *)&bp[26]);
845 if (nsrcs > 0) {
846 if (len < 28 + nsrcs * sizeof(struct in6_addr))
847 printf(" [invalid number of sources]");
848 else if (vflag > 1) {
849 printf(" {");
850 for (i = 0; i < nsrcs; i++) {
851 TCHECK2(bp[28 + i * sizeof(struct in6_addr)],
852 sizeof(struct in6_addr));
853 printf(" %s", ip6addr_string(&bp[28 + i * sizeof(struct in6_addr)]));
854 }
855 printf(" }");
856 } else
857 printf(", %d source(s)", nsrcs);
858 }
859 printf("]");
860 return;
861 trunc:
862 (void)printf("[|icmp6]");
863 return;
864 }
865
866 void
dnsname_print(const u_char * cp,const u_char * ep)867 dnsname_print(const u_char *cp, const u_char *ep)
868 {
869 int i;
870
871 /* DNS name decoding - no decompression */
872 printf(", \"");
873 while (cp < ep) {
874 i = *cp++;
875 if (i) {
876 if (i > ep - cp) {
877 printf("???");
878 break;
879 }
880 while (i-- && cp < ep) {
881 safeputchar(*cp);
882 cp++;
883 }
884 if (cp + 1 < ep && *cp)
885 printf(".");
886 } else {
887 if (cp == ep) {
888 /* FQDN */
889 printf(".");
890 } else if (cp + 1 == ep && *cp == '\0') {
891 /* truncated */
892 } else {
893 /* invalid */
894 printf("???");
895 }
896 break;
897 }
898 }
899 printf("\"");
900 }
901
902 static void
icmp6_nodeinfo_print(u_int icmp6len,const u_char * bp,const u_char * ep)903 icmp6_nodeinfo_print(u_int icmp6len, const u_char *bp, const u_char *ep)
904 {
905 struct icmp6_nodeinfo *ni6;
906 struct icmp6_hdr *dp;
907 const u_char *cp;
908 size_t siz, i;
909 int needcomma;
910
911 if (ep < bp)
912 return;
913 dp = (struct icmp6_hdr *)bp;
914 ni6 = (struct icmp6_nodeinfo *)bp;
915 siz = ep - bp;
916
917 switch (ni6->ni_type) {
918 case ICMP6_NI_QUERY:
919 if (siz == sizeof(*dp) + 4) {
920 /* KAME who-are-you */
921 printf(" who-are-you request");
922 break;
923 }
924 printf(" node information query");
925
926 TCHECK2(*dp, sizeof(*ni6));
927 ni6 = (struct icmp6_nodeinfo *)dp;
928 printf(" ("); /*)*/
929 switch (EXTRACT_16BITS(&ni6->ni_qtype)) {
930 case NI_QTYPE_NOOP:
931 printf("noop");
932 break;
933 case NI_QTYPE_SUPTYPES:
934 printf("supported qtypes");
935 i = EXTRACT_16BITS(&ni6->ni_flags);
936 if (i)
937 printf(" [%s]", (i & 0x01) ? "C" : "");
938 break;
939 break;
940 case NI_QTYPE_FQDN:
941 printf("DNS name");
942 break;
943 case NI_QTYPE_NODEADDR:
944 printf("node addresses");
945 i = ni6->ni_flags;
946 if (!i)
947 break;
948 /* NI_NODEADDR_FLAG_TRUNCATE undefined for query */
949 printf(" [%s%s%s%s%s%s]",
950 (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
951 (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
952 (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
953 (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
954 (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
955 (i & NI_NODEADDR_FLAG_ALL) ? "A" : "");
956 break;
957 default:
958 printf("unknown");
959 break;
960 }
961
962 if (ni6->ni_qtype == NI_QTYPE_NOOP ||
963 ni6->ni_qtype == NI_QTYPE_SUPTYPES) {
964 if (siz != sizeof(*ni6))
965 if (vflag)
966 printf(", invalid len");
967 /*(*/
968 printf(")");
969 break;
970 }
971
972
973 /* XXX backward compat, icmp-name-lookup-03 */
974 if (siz == sizeof(*ni6)) {
975 printf(", 03 draft");
976 /*(*/
977 printf(")");
978 break;
979 }
980
981 switch (ni6->ni_code) {
982 case ICMP6_NI_SUBJ_IPV6:
983 if (!TTEST2(*dp,
984 sizeof(*ni6) + sizeof(struct in6_addr)))
985 break;
986 if (siz != sizeof(*ni6) + sizeof(struct in6_addr)) {
987 if (vflag)
988 printf(", invalid subject len");
989 break;
990 }
991 printf(", subject=%s",
992 getname6((const u_char *)(ni6 + 1)));
993 break;
994 case ICMP6_NI_SUBJ_FQDN:
995 printf(", subject=DNS name");
996 cp = (const u_char *)(ni6 + 1);
997 if (cp[0] == ep - cp - 1) {
998 /* icmp-name-lookup-03, pascal string */
999 if (vflag)
1000 printf(", 03 draft");
1001 cp++;
1002 printf(", \"");
1003 while (cp < ep) {
1004 safeputchar(*cp);
1005 cp++;
1006 }
1007 printf("\"");
1008 } else
1009 dnsname_print(cp, ep);
1010 break;
1011 case ICMP6_NI_SUBJ_IPV4:
1012 if (!TTEST2(*dp, sizeof(*ni6) + sizeof(struct in_addr)))
1013 break;
1014 if (siz != sizeof(*ni6) + sizeof(struct in_addr)) {
1015 if (vflag)
1016 printf(", invalid subject len");
1017 break;
1018 }
1019 printf(", subject=%s",
1020 getname((const u_char *)(ni6 + 1)));
1021 break;
1022 default:
1023 printf(", unknown subject");
1024 break;
1025 }
1026
1027 /*(*/
1028 printf(")");
1029 break;
1030
1031 case ICMP6_NI_REPLY:
1032 if (icmp6len > siz) {
1033 printf("[|icmp6: node information reply]");
1034 break;
1035 }
1036
1037 needcomma = 0;
1038
1039 ni6 = (struct icmp6_nodeinfo *)dp;
1040 printf(" node information reply");
1041 printf(" ("); /*)*/
1042 switch (ni6->ni_code) {
1043 case ICMP6_NI_SUCCESS:
1044 if (vflag) {
1045 printf("success");
1046 needcomma++;
1047 }
1048 break;
1049 case ICMP6_NI_REFUSED:
1050 printf("refused");
1051 needcomma++;
1052 if (siz != sizeof(*ni6))
1053 if (vflag)
1054 printf(", invalid length");
1055 break;
1056 case ICMP6_NI_UNKNOWN:
1057 printf("unknown");
1058 needcomma++;
1059 if (siz != sizeof(*ni6))
1060 if (vflag)
1061 printf(", invalid length");
1062 break;
1063 }
1064
1065 if (ni6->ni_code != ICMP6_NI_SUCCESS) {
1066 /*(*/
1067 printf(")");
1068 break;
1069 }
1070
1071 switch (EXTRACT_16BITS(&ni6->ni_qtype)) {
1072 case NI_QTYPE_NOOP:
1073 if (needcomma)
1074 printf(", ");
1075 printf("noop");
1076 if (siz != sizeof(*ni6))
1077 if (vflag)
1078 printf(", invalid length");
1079 break;
1080 case NI_QTYPE_SUPTYPES:
1081 if (needcomma)
1082 printf(", ");
1083 printf("supported qtypes");
1084 i = EXTRACT_16BITS(&ni6->ni_flags);
1085 if (i)
1086 printf(" [%s]", (i & 0x01) ? "C" : "");
1087 break;
1088 case NI_QTYPE_FQDN:
1089 if (needcomma)
1090 printf(", ");
1091 printf("DNS name");
1092 cp = (const u_char *)(ni6 + 1) + 4;
1093 if (cp[0] == ep - cp - 1) {
1094 /* icmp-name-lookup-03, pascal string */
1095 if (vflag)
1096 printf(", 03 draft");
1097 cp++;
1098 printf(", \"");
1099 while (cp < ep) {
1100 safeputchar(*cp);
1101 cp++;
1102 }
1103 printf("\"");
1104 } else
1105 dnsname_print(cp, ep);
1106 if ((EXTRACT_16BITS(&ni6->ni_flags) & 0x01) != 0)
1107 printf(" [TTL=%u]", *(u_int32_t *)(ni6 + 1));
1108 break;
1109 case NI_QTYPE_NODEADDR:
1110 if (needcomma)
1111 printf(", ");
1112 printf("node addresses");
1113 i = sizeof(*ni6);
1114 while (i < siz) {
1115 if (i + sizeof(struct in6_addr) + sizeof(int32_t) > siz)
1116 break;
1117 printf(" %s", getname6(bp + i));
1118 i += sizeof(struct in6_addr);
1119 printf("(%d)", (int32_t)EXTRACT_32BITS(bp + i));
1120 i += sizeof(int32_t);
1121 }
1122 i = ni6->ni_flags;
1123 if (!i)
1124 break;
1125 printf(" [%s%s%s%s%s%s%s]",
1126 (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
1127 (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
1128 (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
1129 (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
1130 (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
1131 (i & NI_NODEADDR_FLAG_ALL) ? "A" : "",
1132 (i & NI_NODEADDR_FLAG_TRUNCATE) ? "T" : "");
1133 break;
1134 default:
1135 if (needcomma)
1136 printf(", ");
1137 printf("unknown");
1138 break;
1139 }
1140
1141 /*(*/
1142 printf(")");
1143 break;
1144 }
1145 return;
1146
1147 trunc:
1148 fputs("[|icmp6]", stdout);
1149 }
1150
1151 static void
icmp6_rrenum_print(const u_char * bp,const u_char * ep)1152 icmp6_rrenum_print(const u_char *bp, const u_char *ep)
1153 {
1154 struct icmp6_router_renum *rr6;
1155 const char *cp;
1156 struct rr_pco_match *match;
1157 struct rr_pco_use *use;
1158 char hbuf[NI_MAXHOST];
1159 int n;
1160
1161 if (ep < bp)
1162 return;
1163 rr6 = (struct icmp6_router_renum *)bp;
1164 cp = (const char *)(rr6 + 1);
1165
1166 TCHECK(rr6->rr_reserved);
1167 switch (rr6->rr_code) {
1168 case ICMP6_ROUTER_RENUMBERING_COMMAND:
1169 printf("router renum: command");
1170 break;
1171 case ICMP6_ROUTER_RENUMBERING_RESULT:
1172 printf("router renum: result");
1173 break;
1174 case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
1175 printf("router renum: sequence number reset");
1176 break;
1177 default:
1178 printf("router renum: code-#%d", rr6->rr_code);
1179 break;
1180 }
1181
1182 printf(", seq=%u", EXTRACT_32BITS(&rr6->rr_seqnum));
1183
1184 if (vflag) {
1185 #define F(x, y) ((rr6->rr_flags) & (x) ? (y) : "")
1186 printf("["); /*]*/
1187 if (rr6->rr_flags) {
1188 printf("%s%s%s%s%s,", F(ICMP6_RR_FLAGS_TEST, "T"),
1189 F(ICMP6_RR_FLAGS_REQRESULT, "R"),
1190 F(ICMP6_RR_FLAGS_FORCEAPPLY, "A"),
1191 F(ICMP6_RR_FLAGS_SPECSITE, "S"),
1192 F(ICMP6_RR_FLAGS_PREVDONE, "P"));
1193 }
1194 printf("seg=%u,", rr6->rr_segnum);
1195 printf("maxdelay=%u", rr6->rr_maxdelay);
1196 if (rr6->rr_reserved)
1197 printf("rsvd=0x%x", EXTRACT_16BITS(&rr6->rr_reserved));
1198 /*[*/
1199 printf("]");
1200 #undef F
1201 }
1202
1203 if (rr6->rr_code == ICMP6_ROUTER_RENUMBERING_COMMAND) {
1204 match = (struct rr_pco_match *)cp;
1205 cp = (const char *)(match + 1);
1206
1207 TCHECK(match->rpm_prefix);
1208
1209 if (vflag > 1)
1210 printf("\n\t");
1211 else
1212 printf(" ");
1213 printf("match("); /*)*/
1214 switch (match->rpm_code) {
1215 case RPM_PCO_ADD: printf("add"); break;
1216 case RPM_PCO_CHANGE: printf("change"); break;
1217 case RPM_PCO_SETGLOBAL: printf("setglobal"); break;
1218 default: printf("#%u", match->rpm_code); break;
1219 }
1220
1221 if (vflag) {
1222 printf(",ord=%u", match->rpm_ordinal);
1223 printf(",min=%u", match->rpm_minlen);
1224 printf(",max=%u", match->rpm_maxlen);
1225 }
1226 if (inet_ntop(AF_INET6, &match->rpm_prefix, hbuf, sizeof(hbuf)))
1227 printf(",%s/%u", hbuf, match->rpm_matchlen);
1228 else
1229 printf(",?/%u", match->rpm_matchlen);
1230 /*(*/
1231 printf(")");
1232
1233 n = match->rpm_len - 3;
1234 if (n % 4)
1235 goto trunc;
1236 n /= 4;
1237 while (n-- > 0) {
1238 use = (struct rr_pco_use *)cp;
1239 cp = (const char *)(use + 1);
1240
1241 TCHECK(use->rpu_prefix);
1242
1243 if (vflag > 1)
1244 printf("\n\t");
1245 else
1246 printf(" ");
1247 printf("use("); /*)*/
1248 if (use->rpu_flags) {
1249 #define F(x, y) ((use->rpu_flags) & (x) ? (y) : "")
1250 printf("%s%s,",
1251 F(ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME, "V"),
1252 F(ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME, "P"));
1253 #undef F
1254 }
1255 if (vflag) {
1256 printf("mask=0x%x,", use->rpu_ramask);
1257 printf("raflags=0x%x,", use->rpu_raflags);
1258 if (~use->rpu_vltime == 0)
1259 printf("vltime=infty,");
1260 else
1261 printf("vltime=%u,",
1262 EXTRACT_32BITS(&use->rpu_vltime));
1263 if (~use->rpu_pltime == 0)
1264 printf("pltime=infty,");
1265 else
1266 printf("pltime=%u,",
1267 EXTRACT_32BITS(&use->rpu_pltime));
1268 }
1269 if (inet_ntop(AF_INET6, &use->rpu_prefix, hbuf,
1270 sizeof(hbuf)))
1271 printf("%s/%u/%u", hbuf, use->rpu_uselen,
1272 use->rpu_keeplen);
1273 else
1274 printf("?/%u/%u", use->rpu_uselen,
1275 use->rpu_keeplen);
1276 /*(*/
1277 printf(")");
1278 }
1279 }
1280
1281 return;
1282
1283 trunc:
1284 fputs("[|icmp6]", stdout);
1285 }
1286
1287 #endif /* INET6 */
1288