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ICMPv6: Add a length check in the rpl_dio_print() function
[tcpdump] / print-icmp6.c
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 /* \summary: IPv6 Internet Control Message Protocol (ICMPv6) printer */
23
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27
28 #include "netdissect-stdinc.h"
29
30 #include <stdio.h>
31 #include <string.h>
32
33 #include "netdissect.h"
34 #include "addrtoname.h"
35 #include "addrtostr.h"
36 #include "extract.h"
37
38 #include "ip6.h"
39 #include "ipproto.h"
40
41 #include "udp.h"
42 #include "ah.h"
43
44 /* NetBSD: icmp6.h,v 1.13 2000/08/03 16:30:37 itojun Exp */
45 /* $KAME: icmp6.h,v 1.22 2000/08/03 15:25:16 jinmei Exp $ */
46
47 /*
48 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
49 * All rights reserved.
50 *
51 * Redistribution and use in source and binary forms, with or without
52 * modification, are permitted provided that the following conditions
53 * are met:
54 * 1. Redistributions of source code must retain the above copyright
55 * notice, this list of conditions and the following disclaimer.
56 * 2. Redistributions in binary form must reproduce the above copyright
57 * notice, this list of conditions and the following disclaimer in the
58 * documentation and/or other materials provided with the distribution.
59 * 3. Neither the name of the project nor the names of its contributors
60 * may be used to endorse or promote products derived from this software
61 * without specific prior written permission.
62 *
63 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
66 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
73 * SUCH DAMAGE.
74 */
75
76 struct icmp6_hdr {
77 nd_uint8_t icmp6_type; /* type field */
78 nd_uint8_t icmp6_code; /* code field */
79 nd_uint16_t icmp6_cksum; /* checksum field */
80 union {
81 nd_uint32_t icmp6_un_data32[1]; /* type-specific field */
82 nd_uint16_t icmp6_un_data16[2]; /* type-specific field */
83 nd_uint8_t icmp6_un_data8[4]; /* type-specific field */
84 nd_byte icmp6_un_data[1]; /* type-specific field */
85 } icmp6_dataun;
86 };
87
88 #define icmp6_data32 icmp6_dataun.icmp6_un_data32
89 #define icmp6_data16 icmp6_dataun.icmp6_un_data16
90 #define icmp6_data8 icmp6_dataun.icmp6_un_data8
91 #define icmp6_data icmp6_dataun.icmp6_un_data
92 #define icmp6_pptr icmp6_data32[0] /* parameter prob */
93 #define icmp6_mtu icmp6_data32[0] /* packet too big */
94 #define icmp6_id icmp6_data16[0] /* echo request/reply */
95 #define icmp6_seq icmp6_data16[1] /* echo request/reply */
96 #define icmp6_maxdelay icmp6_data16[0] /* mcast group membership */
97
98 #define ICMP6_DST_UNREACH 1 /* dest unreachable, codes: */
99 #define ICMP6_PACKET_TOO_BIG 2 /* packet too big */
100 #define ICMP6_TIME_EXCEEDED 3 /* time exceeded, code: */
101 #define ICMP6_PARAM_PROB 4 /* ip6 header bad */
102
103 #define ICMP6_ECHO_REQUEST 128 /* echo service */
104 #define ICMP6_ECHO_REPLY 129 /* echo reply */
105 #define ICMP6_MEMBERSHIP_QUERY 130 /* group membership query */
106 #define MLD6_LISTENER_QUERY 130 /* multicast listener query */
107 #define ICMP6_MEMBERSHIP_REPORT 131 /* group membership report */
108 #define MLD6_LISTENER_REPORT 131 /* multicast listener report */
109 #define ICMP6_MEMBERSHIP_REDUCTION 132 /* group membership termination */
110 #define MLD6_LISTENER_DONE 132 /* multicast listener done */
111
112 #define ND_ROUTER_SOLICIT 133 /* router solicitation */
113 #define ND_ROUTER_ADVERT 134 /* router advertisement */
114 #define ND_NEIGHBOR_SOLICIT 135 /* neighbor solicitation */
115 #define ND_NEIGHBOR_ADVERT 136 /* neighbor advertisement */
116 #define ND_REDIRECT 137 /* redirect */
117
118 #define ICMP6_ROUTER_RENUMBERING 138 /* router renumbering */
119
120 #define ICMP6_WRUREQUEST 139 /* who are you request */
121 #define ICMP6_WRUREPLY 140 /* who are you reply */
122 #define ICMP6_FQDN_QUERY 139 /* FQDN query */
123 #define ICMP6_FQDN_REPLY 140 /* FQDN reply */
124 #define ICMP6_NI_QUERY 139 /* node information request - RFC 4620 */
125 #define ICMP6_NI_REPLY 140 /* node information reply - RFC 4620 */
126 #define IND_SOLICIT 141 /* inverse neighbor solicitation */
127 #define IND_ADVERT 142 /* inverse neighbor advertisement */
128
129 #define ICMP6_V2_MEMBERSHIP_REPORT 143 /* v2 membership report */
130 #define MLDV2_LISTENER_REPORT 143 /* v2 multicast listener report */
131 #define ICMP6_HADISCOV_REQUEST 144
132 #define ICMP6_HADISCOV_REPLY 145
133 #define ICMP6_MOBILEPREFIX_SOLICIT 146
134 #define ICMP6_MOBILEPREFIX_ADVERT 147
135
136 #define MLD6_MTRACE_RESP 200 /* mtrace response(to sender) */
137 #define MLD6_MTRACE 201 /* mtrace messages */
138
139 #define ICMP6_MAXTYPE 201
140
141 #define ICMP6_DST_UNREACH_NOROUTE 0 /* no route to destination */
142 #define ICMP6_DST_UNREACH_ADMIN 1 /* administratively prohibited */
143 #define ICMP6_DST_UNREACH_NOTNEIGHBOR 2 /* not a neighbor(obsolete) */
144 #define ICMP6_DST_UNREACH_BEYONDSCOPE 2 /* beyond scope of source address */
145 #define ICMP6_DST_UNREACH_ADDR 3 /* address unreachable */
146 #define ICMP6_DST_UNREACH_NOPORT 4 /* port unreachable */
147
148 #define ICMP6_TIME_EXCEED_TRANSIT 0 /* ttl==0 in transit */
149 #define ICMP6_TIME_EXCEED_REASSEMBLY 1 /* ttl==0 in reass */
150
151 #define ICMP6_PARAMPROB_HEADER 0 /* erroneous header field */
152 #define ICMP6_PARAMPROB_NEXTHEADER 1 /* unrecognized next header */
153 #define ICMP6_PARAMPROB_OPTION 2 /* unrecognized option */
154 #define ICMP6_PARAMPROB_FRAGHDRCHAIN 3 /* incomplete header chain */
155
156 #define ICMP6_INFOMSG_MASK 0x80 /* all informational messages */
157
158 #define ICMP6_NI_SUBJ_IPV6 0 /* Query Subject is an IPv6 address */
159 #define ICMP6_NI_SUBJ_FQDN 1 /* Query Subject is a Domain name */
160 #define ICMP6_NI_SUBJ_IPV4 2 /* Query Subject is an IPv4 address */
161
162 #define ICMP6_NI_SUCCESS 0 /* node information successful reply */
163 #define ICMP6_NI_REFUSED 1 /* node information request is refused */
164 #define ICMP6_NI_UNKNOWN 2 /* unknown Qtype */
165
166 #define ICMP6_ROUTER_RENUMBERING_COMMAND 0 /* rr command */
167 #define ICMP6_ROUTER_RENUMBERING_RESULT 1 /* rr result */
168 #define ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET 255 /* rr seq num reset */
169
170 /* Used in kernel only */
171 #define ND_REDIRECT_ONLINK 0 /* redirect to an on-link node */
172 #define ND_REDIRECT_ROUTER 1 /* redirect to a better router */
173
174 /*
175 * Multicast Listener Discovery
176 */
177 struct mld6_hdr {
178 struct icmp6_hdr mld6_hdr;
179 nd_ipv6 mld6_addr; /* multicast address */
180 };
181
182 #define mld6_type mld6_hdr.icmp6_type
183 #define mld6_code mld6_hdr.icmp6_code
184 #define mld6_cksum mld6_hdr.icmp6_cksum
185 #define mld6_maxdelay mld6_hdr.icmp6_data16[0]
186 #define mld6_reserved mld6_hdr.icmp6_data16[1]
187
188 #define MLD_MINLEN 24
189 #define MLDV2_MINLEN 28
190
191 /*
192 * Neighbor Discovery
193 */
194
195 struct nd_router_solicit { /* router solicitation */
196 struct icmp6_hdr nd_rs_hdr;
197 /* could be followed by options */
198 };
199
200 #define nd_rs_type nd_rs_hdr.icmp6_type
201 #define nd_rs_code nd_rs_hdr.icmp6_code
202 #define nd_rs_cksum nd_rs_hdr.icmp6_cksum
203 #define nd_rs_reserved nd_rs_hdr.icmp6_data32[0]
204
205 struct nd_router_advert { /* router advertisement */
206 struct icmp6_hdr nd_ra_hdr;
207 nd_uint32_t nd_ra_reachable; /* reachable time */
208 nd_uint32_t nd_ra_retransmit; /* retransmit timer */
209 /* could be followed by options */
210 };
211
212 #define nd_ra_type nd_ra_hdr.icmp6_type
213 #define nd_ra_code nd_ra_hdr.icmp6_code
214 #define nd_ra_cksum nd_ra_hdr.icmp6_cksum
215 #define nd_ra_curhoplimit nd_ra_hdr.icmp6_data8[0]
216 #define nd_ra_flags_reserved nd_ra_hdr.icmp6_data8[1]
217 #define ND_RA_FLAG_MANAGED 0x80
218 #define ND_RA_FLAG_OTHER 0x40
219 #define ND_RA_FLAG_HOME_AGENT 0x20
220 #define ND_RA_FLAG_IPV6ONLY 0x02
221
222 /*
223 * Router preference values based on draft-draves-ipngwg-router-selection-01.
224 * These are non-standard definitions.
225 */
226 #define ND_RA_FLAG_RTPREF_MASK 0x18 /* 00011000 */
227
228 #define ND_RA_FLAG_RTPREF_HIGH 0x08 /* 00001000 */
229 #define ND_RA_FLAG_RTPREF_MEDIUM 0x00 /* 00000000 */
230 #define ND_RA_FLAG_RTPREF_LOW 0x18 /* 00011000 */
231 #define ND_RA_FLAG_RTPREF_RSV 0x10 /* 00010000 */
232
233 #define nd_ra_router_lifetime nd_ra_hdr.icmp6_data16[1]
234
235 struct nd_neighbor_solicit { /* neighbor solicitation */
236 struct icmp6_hdr nd_ns_hdr;
237 nd_ipv6 nd_ns_target; /*target address */
238 /* could be followed by options */
239 };
240
241 #define nd_ns_type nd_ns_hdr.icmp6_type
242 #define nd_ns_code nd_ns_hdr.icmp6_code
243 #define nd_ns_cksum nd_ns_hdr.icmp6_cksum
244 #define nd_ns_reserved nd_ns_hdr.icmp6_data32[0]
245
246 struct nd_neighbor_advert { /* neighbor advertisement */
247 struct icmp6_hdr nd_na_hdr;
248 nd_ipv6 nd_na_target; /* target address */
249 /* could be followed by options */
250 };
251
252 #define nd_na_type nd_na_hdr.icmp6_type
253 #define nd_na_code nd_na_hdr.icmp6_code
254 #define nd_na_cksum nd_na_hdr.icmp6_cksum
255 #define nd_na_flags_reserved nd_na_hdr.icmp6_data32[0]
256
257 #define ND_NA_FLAG_ROUTER 0x80000000
258 #define ND_NA_FLAG_SOLICITED 0x40000000
259 #define ND_NA_FLAG_OVERRIDE 0x20000000
260
261 struct nd_redirect { /* redirect */
262 struct icmp6_hdr nd_rd_hdr;
263 nd_ipv6 nd_rd_target; /* target address */
264 nd_ipv6 nd_rd_dst; /* destination address */
265 /* could be followed by options */
266 };
267
268 #define nd_rd_type nd_rd_hdr.icmp6_type
269 #define nd_rd_code nd_rd_hdr.icmp6_code
270 #define nd_rd_cksum nd_rd_hdr.icmp6_cksum
271 #define nd_rd_reserved nd_rd_hdr.icmp6_data32[0]
272
273 struct nd_opt_hdr { /* Neighbor discovery option header */
274 nd_uint8_t nd_opt_type;
275 nd_uint8_t nd_opt_len;
276 /* followed by option specific data*/
277 };
278
279 #define ND_OPT_SOURCE_LINKADDR 1
280 #define ND_OPT_TARGET_LINKADDR 2
281 #define ND_OPT_PREFIX_INFORMATION 3
282 #define ND_OPT_REDIRECTED_HEADER 4
283 #define ND_OPT_MTU 5
284 #define ND_OPT_ADVINTERVAL 7
285 #define ND_OPT_HOMEAGENT_INFO 8
286 #define ND_OPT_ROUTE_INFO 24 /* RFC4191 */
287 #define ND_OPT_RDNSS 25
288 #define ND_OPT_DNSSL 31
289
290 struct nd_opt_prefix_info { /* prefix information */
291 nd_uint8_t nd_opt_pi_type;
292 nd_uint8_t nd_opt_pi_len;
293 nd_uint8_t nd_opt_pi_prefix_len;
294 nd_uint8_t nd_opt_pi_flags_reserved;
295 nd_uint32_t nd_opt_pi_valid_time;
296 nd_uint32_t nd_opt_pi_preferred_time;
297 nd_uint32_t nd_opt_pi_reserved2;
298 nd_ipv6 nd_opt_pi_prefix;
299 };
300
301 #define ND_OPT_PI_FLAG_ONLINK 0x80
302 #define ND_OPT_PI_FLAG_AUTO 0x40
303 #define ND_OPT_PI_FLAG_ROUTER 0x20 /*2292bis*/
304
305 struct nd_opt_rd_hdr { /* redirected header */
306 nd_uint8_t nd_opt_rh_type;
307 nd_uint8_t nd_opt_rh_len;
308 nd_uint16_t nd_opt_rh_reserved1;
309 nd_uint32_t nd_opt_rh_reserved2;
310 /* followed by IP header and data */
311 };
312
313 struct nd_opt_mtu { /* MTU option */
314 nd_uint8_t nd_opt_mtu_type;
315 nd_uint8_t nd_opt_mtu_len;
316 nd_uint16_t nd_opt_mtu_reserved;
317 nd_uint32_t nd_opt_mtu_mtu;
318 };
319
320 struct nd_opt_rdnss { /* RDNSS RFC 6106 5.1 */
321 nd_uint8_t nd_opt_rdnss_type;
322 nd_uint8_t nd_opt_rdnss_len;
323 nd_uint16_t nd_opt_rdnss_reserved;
324 nd_uint32_t nd_opt_rdnss_lifetime;
325 nd_ipv6 nd_opt_rdnss_addr[1]; /* variable-length */
326 };
327
328 struct nd_opt_dnssl { /* DNSSL RFC 6106 5.2 */
329 nd_uint8_t nd_opt_dnssl_type;
330 nd_uint8_t nd_opt_dnssl_len;
331 nd_uint16_t nd_opt_dnssl_reserved;
332 nd_uint32_t nd_opt_dnssl_lifetime;
333 /* followed by list of DNS search domains, variable-length */
334 };
335
336 struct nd_opt_advinterval { /* Advertisement interval option */
337 nd_uint8_t nd_opt_adv_type;
338 nd_uint8_t nd_opt_adv_len;
339 nd_uint16_t nd_opt_adv_reserved;
340 nd_uint32_t nd_opt_adv_interval;
341 };
342
343 struct nd_opt_homeagent_info { /* Home Agent info */
344 nd_uint8_t nd_opt_hai_type;
345 nd_uint8_t nd_opt_hai_len;
346 nd_uint16_t nd_opt_hai_reserved;
347 nd_uint16_t nd_opt_hai_preference;
348 nd_uint16_t nd_opt_hai_lifetime;
349 };
350
351 struct nd_opt_route_info { /* route info */
352 nd_uint8_t nd_opt_rti_type;
353 nd_uint8_t nd_opt_rti_len;
354 nd_uint8_t nd_opt_rti_prefixlen;
355 nd_uint8_t nd_opt_rti_flags;
356 nd_uint32_t nd_opt_rti_lifetime;
357 /* prefix follows */
358 };
359
360 /*
361 * icmp6 namelookup
362 */
363
364 struct icmp6_namelookup {
365 struct icmp6_hdr icmp6_nl_hdr;
366 nd_byte icmp6_nl_nonce[8];
367 nd_int32_t icmp6_nl_ttl;
368 #if 0
369 nd_uint8_t icmp6_nl_len;
370 nd_byte icmp6_nl_name[3];
371 #endif
372 /* could be followed by options */
373 };
374
375 /*
376 * icmp6 node information
377 */
378 struct icmp6_nodeinfo {
379 struct icmp6_hdr icmp6_ni_hdr;
380 nd_byte icmp6_ni_nonce[8];
381 /* could be followed by reply data */
382 };
383
384 #define ni_type icmp6_ni_hdr.icmp6_type
385 #define ni_code icmp6_ni_hdr.icmp6_code
386 #define ni_cksum icmp6_ni_hdr.icmp6_cksum
387 #define ni_qtype icmp6_ni_hdr.icmp6_data16[0]
388 #define ni_flags icmp6_ni_hdr.icmp6_data16[1]
389
390 #define NI_QTYPE_NOOP 0 /* NOOP */
391 #define NI_QTYPE_SUPTYPES 1 /* Supported Qtypes (drafts up to 09) */
392 #define NI_QTYPE_FQDN 2 /* FQDN (draft 04) */
393 #define NI_QTYPE_DNSNAME 2 /* DNS Name */
394 #define NI_QTYPE_NODEADDR 3 /* Node Addresses */
395 #define NI_QTYPE_IPV4ADDR 4 /* IPv4 Addresses */
396
397 /* network endian */
398 #define NI_SUPTYPE_FLAG_COMPRESS ((uint16_t)htons(0x1))
399 #define NI_FQDN_FLAG_VALIDTTL ((uint16_t)htons(0x1))
400
401 /* network endian */
402 #define NI_NODEADDR_FLAG_TRUNCATE ((uint16_t)htons(0x1))
403 #define NI_NODEADDR_FLAG_ALL ((uint16_t)htons(0x2))
404 #define NI_NODEADDR_FLAG_COMPAT ((uint16_t)htons(0x4))
405 #define NI_NODEADDR_FLAG_LINKLOCAL ((uint16_t)htons(0x8))
406 #define NI_NODEADDR_FLAG_SITELOCAL ((uint16_t)htons(0x10))
407 #define NI_NODEADDR_FLAG_GLOBAL ((uint16_t)htons(0x20))
408 #define NI_NODEADDR_FLAG_ANYCAST ((uint16_t)htons(0x40)) /* just experimental. not in spec */
409
410 struct ni_reply_fqdn {
411 nd_uint32_t ni_fqdn_ttl; /* TTL */
412 nd_uint8_t ni_fqdn_namelen; /* length in octets of the FQDN */
413 nd_byte ni_fqdn_name[3]; /* XXX: alignment */
414 };
415
416 /*
417 * Router Renumbering. as router-renum-08.txt
418 */
419 struct icmp6_router_renum { /* router renumbering header */
420 struct icmp6_hdr rr_hdr;
421 nd_uint8_t rr_segnum;
422 nd_uint8_t rr_flags;
423 nd_uint16_t rr_maxdelay;
424 nd_uint32_t rr_reserved;
425 };
426 #define ICMP6_RR_FLAGS_TEST 0x80
427 #define ICMP6_RR_FLAGS_REQRESULT 0x40
428 #define ICMP6_RR_FLAGS_FORCEAPPLY 0x20
429 #define ICMP6_RR_FLAGS_SPECSITE 0x10
430 #define ICMP6_RR_FLAGS_PREVDONE 0x08
431
432 #define rr_type rr_hdr.icmp6_type
433 #define rr_code rr_hdr.icmp6_code
434 #define rr_cksum rr_hdr.icmp6_cksum
435 #define rr_seqnum rr_hdr.icmp6_data32[0]
436
437 struct rr_pco_match { /* match prefix part */
438 nd_uint8_t rpm_code;
439 nd_uint8_t rpm_len;
440 nd_uint8_t rpm_ordinal;
441 nd_uint8_t rpm_matchlen;
442 nd_uint8_t rpm_minlen;
443 nd_uint8_t rpm_maxlen;
444 nd_uint16_t rpm_reserved;
445 nd_ipv6 rpm_prefix;
446 };
447
448 #define RPM_PCO_ADD 1
449 #define RPM_PCO_CHANGE 2
450 #define RPM_PCO_SETGLOBAL 3
451 #define RPM_PCO_MAX 4
452
453 struct rr_pco_use { /* use prefix part */
454 nd_uint8_t rpu_uselen;
455 nd_uint8_t rpu_keeplen;
456 nd_uint8_t rpu_ramask;
457 nd_uint8_t rpu_raflags;
458 nd_uint32_t rpu_vltime;
459 nd_uint32_t rpu_pltime;
460 nd_uint32_t rpu_flags;
461 nd_ipv6 rpu_prefix;
462 };
463 #define ICMP6_RR_PCOUSE_RAFLAGS_ONLINK 0x80
464 #define ICMP6_RR_PCOUSE_RAFLAGS_AUTO 0x40
465
466 /* network endian */
467 #define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME ((uint32_t)htonl(0x80000000))
468 #define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME ((uint32_t)htonl(0x40000000))
469
470 struct rr_result { /* router renumbering result message */
471 nd_uint16_t rrr_flags;
472 nd_uint8_t rrr_ordinal;
473 nd_uint8_t rrr_matchedlen;
474 nd_uint32_t rrr_ifid;
475 nd_ipv6 rrr_prefix;
476 };
477 /* network endian */
478 #define ICMP6_RR_RESULT_FLAGS_OOB ((uint16_t)htons(0x0002))
479 #define ICMP6_RR_RESULT_FLAGS_FORBIDDEN ((uint16_t)htons(0x0001))
480
481 static const char *get_rtpref(u_int);
482 static const char *get_lifetime(uint32_t);
483 static void print_lladdr(netdissect_options *ndo, const u_char *, size_t);
484 static int icmp6_opt_print(netdissect_options *ndo, const u_char *, int);
485 static void mld6_print(netdissect_options *ndo, const u_char *);
486 static void mldv2_report_print(netdissect_options *ndo, const u_char *, u_int);
487 static void mldv2_query_print(netdissect_options *ndo, const u_char *, u_int);
488 static const struct udphdr *get_upperlayer(netdissect_options *ndo, const u_char *, u_int *);
489 static void dnsname_print(netdissect_options *ndo, const u_char *, const u_char *);
490 static void icmp6_nodeinfo_print(netdissect_options *ndo, u_int, const u_char *, const u_char *);
491 static void icmp6_rrenum_print(netdissect_options *ndo, const u_char *, const u_char *);
492
493 #ifndef abs
494 #define abs(a) ((0 < (a)) ? (a) : -(a))
495 #endif
496
497 /*
498 * DIO: Updated to RFC6550, as published in 2012: section 6. (page 30)
499 */
500
501 #define ND_RPL_MESSAGE 155 /* 0x9B */
502
503 enum ND_RPL_CODE {
504 ND_RPL_DAG_IS=0x00,
505 ND_RPL_DAG_IO=0x01,
506 ND_RPL_DAO =0x02,
507 ND_RPL_DAO_ACK=0x03,
508 ND_RPL_SEC_DAG_IS = 0x80,
509 ND_RPL_SEC_DAG_IO = 0x81,
510 ND_RPL_SEC_DAG = 0x82,
511 ND_RPL_SEC_DAG_ACK= 0x83,
512 ND_RPL_SEC_CONSIST= 0x8A
513 };
514
515 enum ND_RPL_DIO_FLAGS {
516 ND_RPL_DIO_GROUNDED = 0x80,
517 ND_RPL_DIO_DATRIG = 0x40,
518 ND_RPL_DIO_DASUPPORT= 0x20,
519 ND_RPL_DIO_RES4 = 0x10,
520 ND_RPL_DIO_RES3 = 0x08,
521 ND_RPL_DIO_PRF_MASK = 0x07 /* 3-bit preference */
522 };
523
524 #define DAGID_LEN 16
525
526 /* section 6 of draft-ietf-roll-rpl-19 */
527 struct nd_rpl_security {
528 nd_uint8_t rpl_sec_t_reserved; /* bit 7 is T-bit */
529 nd_uint8_t rpl_sec_algo;
530 nd_uint16_t rpl_sec_kim_lvl_flags; /* bit 15/14, KIM */
531 /* bit 10-8, LVL, bit 7-0 flags */
532 nd_uint32_t rpl_sec_counter;
533 #if 0
534 nd_byte rpl_sec_ki[0]; /* depends upon kim */
535 #endif
536 };
537
538 /* section 6.2.1, DODAG Information Solication (DIS_IS) */
539 struct nd_rpl_dis_is {
540 nd_uint8_t rpl_dis_flags;
541 nd_uint8_t rpl_dis_reserved;
542 #if 0
543 nd_byte rpl_dis_options[0];
544 #endif
545 };
546
547 /* section 6.3.1, DODAG Information Object (DIO) */
548 struct nd_rpl_dio {
549 nd_uint8_t rpl_instanceid;
550 nd_uint8_t rpl_version;
551 nd_uint16_t rpl_dagrank;
552 nd_uint8_t rpl_mopprf; /* bit 7=G, 5-3=MOP, 2-0=PRF */
553 nd_uint8_t rpl_dtsn; /* Dest. Advertisement Trigger Sequence Number */
554 nd_uint8_t rpl_flags; /* no flags defined yet */
555 nd_uint8_t rpl_resv1;
556 nd_byte rpl_dagid[DAGID_LEN];
557 };
558 #define RPL_DIO_GROUND_FLAG 0x80
559 #define RPL_DIO_MOP_SHIFT 3
560 #define RPL_DIO_MOP_MASK (7 << RPL_DIO_MOP_SHIFT)
561 #define RPL_DIO_PRF_SHIFT 0
562 #define RPL_DIO_PRF_MASK (7 << RPL_DIO_PRF_SHIFT)
563 #define RPL_DIO_GROUNDED(X) ((X)&RPL_DIO_GROUND_FLAG)
564 #define RPL_DIO_MOP(X) (enum RPL_DIO_MOP)(((X)&RPL_DIO_MOP_MASK) >> RPL_DIO_MOP_SHIFT)
565 #define RPL_DIO_PRF(X) (((X)&RPL_DIO_PRF_MASK) >> RPL_DIO_PRF_SHIFT)
566
567 enum RPL_DIO_MOP {
568 RPL_DIO_NONSTORING= 0x0,
569 RPL_DIO_STORING = 0x1,
570 RPL_DIO_NONSTORING_MULTICAST = 0x2,
571 RPL_DIO_STORING_MULTICAST = 0x3
572 };
573
574 enum RPL_SUBOPT {
575 RPL_OPT_PAD1 = 0,
576 RPL_OPT_PADN = 1,
577 RPL_DIO_METRICS = 2,
578 RPL_DIO_ROUTINGINFO = 3,
579 RPL_DIO_CONFIG = 4,
580 RPL_DAO_RPLTARGET = 5,
581 RPL_DAO_TRANSITINFO = 6,
582 RPL_DIO_DESTPREFIX = 8,
583 RPL_DAO_RPLTARGET_DESC=9
584 };
585
586 struct rpl_genoption {
587 nd_uint8_t rpl_dio_type;
588 nd_uint8_t rpl_dio_len; /* suboption length, not including type/len */
589 };
590 #define RPL_GENOPTION_LEN 2
591
592 #define RPL_DIO_LIFETIME_INFINITE 0xffffffff
593 #define RPL_DIO_LIFETIME_DISCONNECT 0
594
595 struct rpl_dio_destprefix {
596 nd_uint8_t rpl_dio_type;
597 nd_uint8_t rpl_dio_len;
598 nd_uint8_t rpl_dio_prefixlen; /* in bits */
599 nd_uint8_t rpl_dio_prf; /* flags, including Route Preference */
600 nd_uint32_t rpl_dio_prefixlifetime; /* in seconds */
601 #if 0
602 nd_byte rpl_dio_prefix[0]; /* variable number of bytes */
603 #endif
604 };
605
606 /* section 6.4.1, DODAG Information Object (DIO) */
607 struct nd_rpl_dao {
608 nd_uint8_t rpl_instanceid;
609 nd_uint8_t rpl_flags; /* bit 7=K, 6=D */
610 nd_uint8_t rpl_resv;
611 nd_uint8_t rpl_daoseq;
612 nd_byte rpl_dagid[DAGID_LEN]; /* present when D set. */
613 };
614 #define ND_RPL_DAO_MIN_LEN 4 /* length without DAGID */
615
616 /* indicates if this DAO is to be acK'ed */
617 #define RPL_DAO_K_SHIFT 7
618 #define RPL_DAO_K_MASK (1 << RPL_DAO_K_SHIFT)
619 #define RPL_DAO_K(X) (((X)&RPL_DAO_K_MASK) >> RPL_DAO_K_SHIFT)
620
621 /* indicates if the DAGID is present */
622 #define RPL_DAO_D_SHIFT 6
623 #define RPL_DAO_D_MASK (1 << RPL_DAO_D_SHIFT)
624 #define RPL_DAO_D(X) (((X)&RPL_DAO_D_MASK) >> RPL_DAO_D_SHIFT)
625
626 struct rpl_dao_target {
627 nd_uint8_t rpl_dao_type;
628 nd_uint8_t rpl_dao_len;
629 nd_uint8_t rpl_dao_flags; /* unused */
630 nd_uint8_t rpl_dao_prefixlen; /* in bits */
631 #if 0
632 nd_byte rpl_dao_prefix[0]; /* variable number of bytes */
633 #endif
634 };
635
636 /* section 6.5.1, Destination Advertisement Object Acknowledgement (DAO-ACK) */
637 struct nd_rpl_daoack {
638 nd_uint8_t rpl_instanceid;
639 nd_uint8_t rpl_flags; /* bit 7=D */
640 nd_uint8_t rpl_daoseq;
641 nd_uint8_t rpl_status;
642 nd_byte rpl_dagid[DAGID_LEN]; /* present when D set. */
643 };
644 #define ND_RPL_DAOACK_MIN_LEN 4 /* length without DAGID */
645 /* indicates if the DAGID is present */
646 #define RPL_DAOACK_D_SHIFT 7
647 #define RPL_DAOACK_D_MASK (1 << RPL_DAOACK_D_SHIFT)
648 #define RPL_DAOACK_D(X) (((X)&RPL_DAOACK_D_MASK) >> RPL_DAOACK_D_SHIFT)
649
650 static const struct tok icmp6_type_values[] = {
651 { ICMP6_DST_UNREACH, "destination unreachable"},
652 { ICMP6_PACKET_TOO_BIG, "packet too big"},
653 { ICMP6_TIME_EXCEEDED, "time exceeded in-transit"},
654 { ICMP6_PARAM_PROB, "parameter problem"},
655 { ICMP6_ECHO_REQUEST, "echo request"},
656 { ICMP6_ECHO_REPLY, "echo reply"},
657 { MLD6_LISTENER_QUERY, "multicast listener query"},
658 { MLD6_LISTENER_REPORT, "multicast listener report"},
659 { MLD6_LISTENER_DONE, "multicast listener done"},
660 { ND_ROUTER_SOLICIT, "router solicitation"},
661 { ND_ROUTER_ADVERT, "router advertisement"},
662 { ND_NEIGHBOR_SOLICIT, "neighbor solicitation"},
663 { ND_NEIGHBOR_ADVERT, "neighbor advertisement"},
664 { ND_REDIRECT, "redirect"},
665 { ICMP6_ROUTER_RENUMBERING, "router renumbering"},
666 { IND_SOLICIT, "inverse neighbor solicitation"},
667 { IND_ADVERT, "inverse neighbor advertisement"},
668 { MLDV2_LISTENER_REPORT, "multicast listener report v2"},
669 { ICMP6_HADISCOV_REQUEST, "ha discovery request"},
670 { ICMP6_HADISCOV_REPLY, "ha discovery reply"},
671 { ICMP6_MOBILEPREFIX_SOLICIT, "mobile router solicitation"},
672 { ICMP6_MOBILEPREFIX_ADVERT, "mobile router advertisement"},
673 { ICMP6_WRUREQUEST, "who-are-you request"},
674 { ICMP6_WRUREPLY, "who-are-you reply"},
675 { ICMP6_NI_QUERY, "node information query"},
676 { ICMP6_NI_REPLY, "node information reply"},
677 { MLD6_MTRACE, "mtrace message"},
678 { MLD6_MTRACE_RESP, "mtrace response"},
679 { ND_RPL_MESSAGE, "RPL"},
680 { 0, NULL }
681 };
682
683 static const struct tok icmp6_dst_unreach_code_values[] = {
684 { ICMP6_DST_UNREACH_NOROUTE, "unreachable route" },
685 { ICMP6_DST_UNREACH_ADMIN, " unreachable prohibited"},
686 { ICMP6_DST_UNREACH_BEYONDSCOPE, "beyond scope"},
687 { ICMP6_DST_UNREACH_ADDR, "unreachable address"},
688 { ICMP6_DST_UNREACH_NOPORT, "unreachable port"},
689 { 0, NULL }
690 };
691
692 static const struct tok icmp6_opt_pi_flag_values[] = {
693 { ND_OPT_PI_FLAG_ONLINK, "onlink" },
694 { ND_OPT_PI_FLAG_AUTO, "auto" },
695 { ND_OPT_PI_FLAG_ROUTER, "router" },
696 { 0, NULL }
697 };
698
699 static const struct tok icmp6_opt_ra_flag_values[] = {
700 { ND_RA_FLAG_MANAGED, "managed" },
701 { ND_RA_FLAG_OTHER, "other stateful"},
702 { ND_RA_FLAG_HOME_AGENT, "home agent"},
703 { ND_RA_FLAG_IPV6ONLY, "ipv6 only"},
704 { 0, NULL }
705 };
706
707 static const struct tok icmp6_nd_na_flag_values[] = {
708 { ND_NA_FLAG_ROUTER, "router" },
709 { ND_NA_FLAG_SOLICITED, "solicited" },
710 { ND_NA_FLAG_OVERRIDE, "override" },
711 { 0, NULL }
712 };
713
714
715 static const struct tok icmp6_opt_values[] = {
716 { ND_OPT_SOURCE_LINKADDR, "source link-address"},
717 { ND_OPT_TARGET_LINKADDR, "destination link-address"},
718 { ND_OPT_PREFIX_INFORMATION, "prefix info"},
719 { ND_OPT_REDIRECTED_HEADER, "redirected header"},
720 { ND_OPT_MTU, "mtu"},
721 { ND_OPT_RDNSS, "rdnss"},
722 { ND_OPT_DNSSL, "dnssl"},
723 { ND_OPT_ADVINTERVAL, "advertisement interval"},
724 { ND_OPT_HOMEAGENT_INFO, "homeagent information"},
725 { ND_OPT_ROUTE_INFO, "route info"},
726 { 0, NULL }
727 };
728
729 /* mldv2 report types */
730 static const struct tok mldv2report2str[] = {
731 { 1, "is_in" },
732 { 2, "is_ex" },
733 { 3, "to_in" },
734 { 4, "to_ex" },
735 { 5, "allow" },
736 { 6, "block" },
737 { 0, NULL }
738 };
739
740 static const char *
741 get_rtpref(u_int v)
742 {
743 static const char *rtpref_str[] = {
744 "medium", /* 00 */
745 "high", /* 01 */
746 "rsv", /* 10 */
747 "low" /* 11 */
748 };
749
750 return rtpref_str[((v & ND_RA_FLAG_RTPREF_MASK) >> 3) & 0xff];
751 }
752
753 static const char *
754 get_lifetime(uint32_t v)
755 {
756 static char buf[20];
757
758 if (v == (uint32_t)~0UL)
759 return "infinity";
760 else {
761 snprintf(buf, sizeof(buf), "%us", v);
762 return buf;
763 }
764 }
765
766 static void
767 print_lladdr(netdissect_options *ndo, const uint8_t *p, size_t l)
768 {
769 const uint8_t *ep, *q;
770
771 q = p;
772 ep = p + l;
773 while (l > 0 && q < ep) {
774 if (q > p)
775 ND_PRINT(":");
776 ND_PRINT("%02x", GET_U_1(q));
777 q++;
778 l--;
779 }
780 }
781
782 static uint16_t icmp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
783 const struct icmp6_hdr *icp, u_int len)
784 {
785 return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)icp, len, len,
786 IPPROTO_ICMPV6);
787 }
788
789 static const struct tok rpl_mop_values[] = {
790 { RPL_DIO_NONSTORING, "nonstoring"},
791 { RPL_DIO_STORING, "storing"},
792 { RPL_DIO_NONSTORING_MULTICAST, "nonstoring-multicast"},
793 { RPL_DIO_STORING_MULTICAST, "storing-multicast"},
794 { 0, NULL},
795 };
796
797 static const struct tok rpl_subopt_values[] = {
798 { RPL_OPT_PAD1, "pad1"},
799 { RPL_OPT_PADN, "padN"},
800 { RPL_DIO_METRICS, "metrics"},
801 { RPL_DIO_ROUTINGINFO, "routinginfo"},
802 { RPL_DIO_CONFIG, "config"},
803 { RPL_DAO_RPLTARGET, "rpltarget"},
804 { RPL_DAO_TRANSITINFO, "transitinfo"},
805 { RPL_DIO_DESTPREFIX, "destprefix"},
806 { RPL_DAO_RPLTARGET_DESC, "rpltargetdesc"},
807 { 0, NULL},
808 };
809
810 static void
811 rpl_printopts(netdissect_options *ndo, const uint8_t *opts, u_int length)
812 {
813 const struct rpl_genoption *opt;
814 uint8_t dio_type;
815 u_int optlen;
816
817 while (length != 0) {
818 opt = (const struct rpl_genoption *)opts;
819 dio_type = GET_U_1(opt->rpl_dio_type);
820 if (dio_type == RPL_OPT_PAD1) {
821 optlen = 1;
822 ND_PRINT(" opt:pad1");
823 } else {
824 if (length < RPL_GENOPTION_LEN)
825 goto trunc;
826 optlen = GET_U_1(opt->rpl_dio_len)+RPL_GENOPTION_LEN;
827 ND_PRINT(" opt:%s len:%u ",
828 tok2str(rpl_subopt_values, "subopt:%u", dio_type),
829 optlen);
830 ND_TCHECK_LEN(opt, optlen);
831 if (length < optlen)
832 goto trunc;
833 if (ndo->ndo_vflag > 2) {
834 hex_print(ndo,
835 " ",
836 opts + RPL_GENOPTION_LEN, /* content of DIO option */
837 optlen - RPL_GENOPTION_LEN);
838 }
839 }
840 opts += optlen;
841 length -= optlen;
842 }
843 return;
844 trunc:
845 nd_print_trunc(ndo);
846 }
847
848 static void
849 rpl_dio_print(netdissect_options *ndo,
850 const u_char *bp, u_int length)
851 {
852 const struct nd_rpl_dio *dio = (const struct nd_rpl_dio *)bp;
853
854 ND_ICHECK_ZU(length, <, sizeof(struct nd_rpl_dio));
855 ND_PRINT(" [dagid:%s,seq:%u,instance:%u,rank:%u,%smop:%s,prf:%u]",
856 GET_IP6ADDR_STRING(dio->rpl_dagid),
857 GET_U_1(dio->rpl_dtsn),
858 GET_U_1(dio->rpl_instanceid),
859 GET_BE_U_2(dio->rpl_dagrank),
860 RPL_DIO_GROUNDED(GET_U_1(dio->rpl_mopprf)) ? "grounded,":"",
861 tok2str(rpl_mop_values, "mop%u",
862 RPL_DIO_MOP(GET_U_1(dio->rpl_mopprf))),
863 RPL_DIO_PRF(GET_U_1(dio->rpl_mopprf)));
864
865 if(ndo->ndo_vflag > 1) {
866 rpl_printopts(ndo, bp + sizeof(struct nd_rpl_dio),
867 length - sizeof(struct nd_rpl_dio));
868 }
869 return;
870 invalid:
871 nd_print_invalid(ndo);
872 }
873
874 static void
875 rpl_dao_print(netdissect_options *ndo,
876 const u_char *bp, u_int length)
877 {
878 const struct nd_rpl_dao *dao = (const struct nd_rpl_dao *)bp;
879 const char *dagid_str = "<elided>";
880 uint8_t rpl_flags;
881
882 ND_TCHECK_SIZE(dao);
883 if (length < ND_RPL_DAO_MIN_LEN)
884 goto tooshort;
885
886 bp += ND_RPL_DAO_MIN_LEN;
887 length -= ND_RPL_DAO_MIN_LEN;
888 rpl_flags = GET_U_1(dao->rpl_flags);
889 if(RPL_DAO_D(rpl_flags)) {
890 ND_TCHECK_LEN(dao->rpl_dagid, DAGID_LEN);
891 if (length < DAGID_LEN)
892 goto tooshort;
893 dagid_str = ip6addr_string (ndo, dao->rpl_dagid);
894 bp += DAGID_LEN;
895 length -= DAGID_LEN;
896 }
897
898 ND_PRINT(" [dagid:%s,seq:%u,instance:%u%s%s,%02x]",
899 dagid_str,
900 GET_U_1(dao->rpl_daoseq),
901 GET_U_1(dao->rpl_instanceid),
902 RPL_DAO_K(rpl_flags) ? ",acK":"",
903 RPL_DAO_D(rpl_flags) ? ",Dagid":"",
904 rpl_flags);
905
906 if(ndo->ndo_vflag > 1) {
907 rpl_printopts(ndo, bp, length);
908 }
909 return;
910
911 trunc:
912 nd_print_trunc(ndo);
913 return;
914
915 tooshort:
916 ND_PRINT(" [|length too short]");
917 }
918
919 static void
920 rpl_daoack_print(netdissect_options *ndo,
921 const u_char *bp, u_int length)
922 {
923 const struct nd_rpl_daoack *daoack = (const struct nd_rpl_daoack *)bp;
924 const char *dagid_str = "<elided>";
925
926 ND_TCHECK_LEN(daoack, ND_RPL_DAOACK_MIN_LEN);
927 if (length < ND_RPL_DAOACK_MIN_LEN)
928 goto tooshort;
929
930 bp += ND_RPL_DAOACK_MIN_LEN;
931 length -= ND_RPL_DAOACK_MIN_LEN;
932 if(RPL_DAOACK_D(GET_U_1(daoack->rpl_flags))) {
933 ND_TCHECK_LEN(daoack->rpl_dagid, DAGID_LEN);
934 if (length < DAGID_LEN)
935 goto tooshort;
936 dagid_str = ip6addr_string (ndo, daoack->rpl_dagid);
937 bp += DAGID_LEN;
938 length -= DAGID_LEN;
939 }
940
941 ND_PRINT(" [dagid:%s,seq:%u,instance:%u,status:%u]",
942 dagid_str,
943 GET_U_1(daoack->rpl_daoseq),
944 GET_U_1(daoack->rpl_instanceid),
945 GET_U_1(daoack->rpl_status));
946
947 /* no officially defined options for DAOACK, but print any we find */
948 if(ndo->ndo_vflag > 1) {
949 rpl_printopts(ndo, bp, length);
950 }
951 return;
952
953 trunc:
954 nd_print_trunc(ndo);
955 return;
956
957 tooshort:
958 ND_PRINT(" [|dao-length too short]");
959 }
960
961 static void
962 rpl_print(netdissect_options *ndo,
963 uint8_t icmp6_code,
964 const u_char *bp, u_int length)
965 {
966 int secured = icmp6_code & 0x80;
967 int basecode= icmp6_code & 0x7f;
968
969 if(secured) {
970 ND_PRINT(", (SEC) [worktodo]");
971 /* XXX
972 * the next header pointer needs to move forward to
973 * skip the secure part.
974 */
975 return;
976 } else {
977 ND_PRINT(", (CLR)");
978 }
979
980 switch(basecode) {
981 case ND_RPL_DAG_IS:
982 ND_PRINT("DODAG Information Solicitation");
983 if(ndo->ndo_vflag) {
984 }
985 break;
986 case ND_RPL_DAG_IO:
987 ND_PRINT("DODAG Information Object");
988 if(ndo->ndo_vflag) {
989 rpl_dio_print(ndo, bp, length);
990 }
991 break;
992 case ND_RPL_DAO:
993 ND_PRINT("Destination Advertisement Object");
994 if(ndo->ndo_vflag) {
995 rpl_dao_print(ndo, bp, length);
996 }
997 break;
998 case ND_RPL_DAO_ACK:
999 ND_PRINT("Destination Advertisement Object Ack");
1000 if(ndo->ndo_vflag) {
1001 rpl_daoack_print(ndo, bp, length);
1002 }
1003 break;
1004 default:
1005 ND_PRINT("RPL message, unknown code %u",icmp6_code);
1006 break;
1007 }
1008 return;
1009
1010 #if 0
1011 trunc:
1012 nd_print_trunc(ndo);
1013 return;
1014 #endif
1015
1016 }
1017
1018
1019 void
1020 icmp6_print(netdissect_options *ndo,
1021 const u_char *bp, u_int length, const u_char *bp2, int fragmented)
1022 {
1023 const struct icmp6_hdr *dp;
1024 uint8_t icmp6_type, icmp6_code;
1025 const struct ip6_hdr *ip;
1026 const struct ip6_hdr *oip;
1027 const struct udphdr *ouh;
1028 uint16_t dport;
1029 const u_char *ep;
1030 u_int prot;
1031
1032 ndo->ndo_protocol = "icmp6";
1033 dp = (const struct icmp6_hdr *)bp;
1034 ip = (const struct ip6_hdr *)bp2;
1035 oip = (const struct ip6_hdr *)(dp + 1);
1036 /* 'ep' points to the end of available data. */
1037 ep = ndo->ndo_snapend;
1038 if (length == 0) {
1039 ND_PRINT("ICMP6, length 0");
1040 nd_print_invalid(ndo);
1041 return;
1042 }
1043
1044 if (ndo->ndo_vflag && !fragmented) {
1045 uint16_t sum, udp_sum;
1046
1047 if (ND_TTEST_LEN(bp, length)) {
1048 udp_sum = GET_BE_U_2(dp->icmp6_cksum);
1049 sum = icmp6_cksum(ndo, ip, dp, length);
1050 if (sum != 0)
1051 ND_PRINT("[bad icmp6 cksum 0x%04x -> 0x%04x!] ",
1052 udp_sum,
1053 in_cksum_shouldbe(udp_sum, sum));
1054 else
1055 ND_PRINT("[icmp6 sum ok] ");
1056 }
1057 }
1058
1059 icmp6_type = GET_U_1(dp->icmp6_type);
1060 ND_PRINT("ICMP6, %s", tok2str(icmp6_type_values,"unknown icmp6 type (%u)",icmp6_type));
1061
1062 /* display cosmetics: print the packet length for printer that use the vflag now */
1063 if (ndo->ndo_vflag && (icmp6_type == ND_ROUTER_SOLICIT ||
1064 icmp6_type == ND_ROUTER_ADVERT ||
1065 icmp6_type == ND_NEIGHBOR_ADVERT ||
1066 icmp6_type == ND_NEIGHBOR_SOLICIT ||
1067 icmp6_type == ND_REDIRECT ||
1068 icmp6_type == ICMP6_HADISCOV_REPLY ||
1069 icmp6_type == ICMP6_MOBILEPREFIX_ADVERT ))
1070 ND_PRINT(", length %u", length);
1071
1072 icmp6_code = GET_U_1(dp->icmp6_code);
1073
1074 switch (icmp6_type) {
1075 case ICMP6_DST_UNREACH:
1076 ND_PRINT(", %s", tok2str(icmp6_dst_unreach_code_values,"unknown unreach code (%u)",icmp6_code));
1077 switch (icmp6_code) {
1078
1079 case ICMP6_DST_UNREACH_NOROUTE: /* fall through */
1080 case ICMP6_DST_UNREACH_ADMIN:
1081 case ICMP6_DST_UNREACH_ADDR:
1082 ND_PRINT(" %s",GET_IP6ADDR_STRING(oip->ip6_dst));
1083 break;
1084 case ICMP6_DST_UNREACH_BEYONDSCOPE:
1085 ND_PRINT(" %s, source address %s",
1086 GET_IP6ADDR_STRING(oip->ip6_dst),
1087 GET_IP6ADDR_STRING(oip->ip6_src));
1088 break;
1089 case ICMP6_DST_UNREACH_NOPORT:
1090 if ((ouh = get_upperlayer(ndo, (const u_char *)oip, &prot))
1091 == NULL)
1092 goto trunc;
1093
1094 dport = GET_BE_U_2(ouh->uh_dport);
1095 switch (prot) {
1096 case IPPROTO_TCP:
1097 ND_PRINT(", %s tcp port %s",
1098 GET_IP6ADDR_STRING(oip->ip6_dst),
1099 tcpport_string(ndo, dport));
1100 break;
1101 case IPPROTO_UDP:
1102 ND_PRINT(", %s udp port %s",
1103 GET_IP6ADDR_STRING(oip->ip6_dst),
1104 udpport_string(ndo, dport));
1105 break;
1106 default:
1107 ND_PRINT(", %s protocol %u port %u unreachable",
1108 GET_IP6ADDR_STRING(oip->ip6_dst),
1109 prot, dport);
1110 break;
1111 }
1112 break;
1113 default:
1114 if (ndo->ndo_vflag <= 1) {
1115 print_unknown_data(ndo, bp,"\n\t",length);
1116 return;
1117 }
1118 break;
1119 }
1120 break;
1121 case ICMP6_PACKET_TOO_BIG:
1122 ND_PRINT(", mtu %u", GET_BE_U_4(dp->icmp6_mtu));
1123 break;
1124 case ICMP6_TIME_EXCEEDED:
1125 switch (icmp6_code) {
1126 case ICMP6_TIME_EXCEED_TRANSIT:
1127 ND_PRINT(" for %s",
1128 GET_IP6ADDR_STRING(oip->ip6_dst));
1129 break;
1130 case ICMP6_TIME_EXCEED_REASSEMBLY:
1131 ND_PRINT(" (reassembly)");
1132 break;
1133 default:
1134 ND_PRINT(", unknown code (%u)", icmp6_code);
1135 break;
1136 }
1137 break;
1138 case ICMP6_PARAM_PROB:
1139 ND_TCHECK_16(oip->ip6_dst);
1140 switch (icmp6_code) {
1141 case ICMP6_PARAMPROB_HEADER:
1142 ND_PRINT(", erroneous - octet %u",
1143 GET_BE_U_4(dp->icmp6_pptr));
1144 break;
1145 case ICMP6_PARAMPROB_NEXTHEADER:
1146 ND_PRINT(", next header - octet %u",
1147 GET_BE_U_4(dp->icmp6_pptr));
1148 break;
1149 case ICMP6_PARAMPROB_OPTION:
1150 ND_PRINT(", option - octet %u",
1151 GET_BE_U_4(dp->icmp6_pptr));
1152 break;
1153 case ICMP6_PARAMPROB_FRAGHDRCHAIN:
1154 ND_PRINT(", incomplete header chain - octet %u",
1155 GET_BE_U_4(dp->icmp6_pptr));
1156 break;
1157 default:
1158 ND_PRINT(", code-#%u",
1159 icmp6_code);
1160 break;
1161 }
1162 break;
1163 case ICMP6_ECHO_REQUEST:
1164 case ICMP6_ECHO_REPLY:
1165 ND_PRINT(", id %u, seq %u", GET_BE_U_2(dp->icmp6_id),
1166 GET_BE_U_2(dp->icmp6_seq));
1167 break;
1168 case ICMP6_MEMBERSHIP_QUERY:
1169 if (length == MLD_MINLEN) {
1170 mld6_print(ndo, (const u_char *)dp);
1171 } else if (length >= MLDV2_MINLEN) {
1172 ND_PRINT(" v2");
1173 mldv2_query_print(ndo, (const u_char *)dp, length);
1174 } else {
1175 ND_PRINT(" unknown-version (len %u) ", length);
1176 }
1177 break;
1178 case ICMP6_MEMBERSHIP_REPORT:
1179 mld6_print(ndo, (const u_char *)dp);
1180 break;
1181 case ICMP6_MEMBERSHIP_REDUCTION:
1182 mld6_print(ndo, (const u_char *)dp);
1183 break;
1184 case ND_ROUTER_SOLICIT:
1185 #define RTSOLLEN 8
1186 if (ndo->ndo_vflag) {
1187 if (icmp6_opt_print(ndo, (const u_char *)dp + RTSOLLEN,
1188 length - RTSOLLEN) == -1)
1189 goto trunc;
1190 }
1191 break;
1192 case ND_ROUTER_ADVERT:
1193 #define RTADVLEN 16
1194 if (ndo->ndo_vflag) {
1195 const struct nd_router_advert *p;
1196
1197 p = (const struct nd_router_advert *)dp;
1198 ND_PRINT("\n\thop limit %u, Flags [%s]"
1199 ", pref %s, router lifetime %us, reachable time %ums, retrans timer %ums",
1200 GET_U_1(p->nd_ra_curhoplimit),
1201 bittok2str(icmp6_opt_ra_flag_values,"none",GET_U_1(p->nd_ra_flags_reserved)),
1202 get_rtpref(GET_U_1(p->nd_ra_flags_reserved)),
1203 GET_BE_U_2(p->nd_ra_router_lifetime),
1204 GET_BE_U_4(p->nd_ra_reachable),
1205 GET_BE_U_4(p->nd_ra_retransmit));
1206
1207 if (icmp6_opt_print(ndo, (const u_char *)dp + RTADVLEN,
1208 length - RTADVLEN) == -1)
1209 goto trunc;
1210 }
1211 break;
1212 case ND_NEIGHBOR_SOLICIT:
1213 {
1214 const struct nd_neighbor_solicit *p;
1215 p = (const struct nd_neighbor_solicit *)dp;
1216 ND_PRINT(", who has %s", GET_IP6ADDR_STRING(p->nd_ns_target));
1217 if (ndo->ndo_vflag) {
1218 #define NDSOLLEN 24
1219 if (icmp6_opt_print(ndo, (const u_char *)dp + NDSOLLEN,
1220 length - NDSOLLEN) == -1)
1221 goto trunc;
1222 }
1223 }
1224 break;
1225 case ND_NEIGHBOR_ADVERT:
1226 {
1227 const struct nd_neighbor_advert *p;
1228
1229 p = (const struct nd_neighbor_advert *)dp;
1230 ND_PRINT(", tgt is %s",
1231 GET_IP6ADDR_STRING(p->nd_na_target));
1232 if (ndo->ndo_vflag) {
1233 ND_PRINT(", Flags [%s]",
1234 bittok2str(icmp6_nd_na_flag_values,
1235 "none",
1236 GET_BE_U_4(p->nd_na_flags_reserved)));
1237 #define NDADVLEN 24
1238 if (icmp6_opt_print(ndo, (const u_char *)dp + NDADVLEN,
1239 length - NDADVLEN) == -1)
1240 goto trunc;
1241 #undef NDADVLEN
1242 }
1243 }
1244 break;
1245 case ND_REDIRECT:
1246 {
1247 const struct nd_redirect *p;
1248
1249 p = (const struct nd_redirect *)dp;
1250 ND_PRINT(", %s", GET_IP6ADDR_STRING(p->nd_rd_dst));
1251 ND_PRINT(" to %s", GET_IP6ADDR_STRING(p->nd_rd_target));
1252 #define REDIRECTLEN 40
1253 if (ndo->ndo_vflag) {
1254 if (icmp6_opt_print(ndo, (const u_char *)dp + REDIRECTLEN,
1255 length - REDIRECTLEN) == -1)
1256 goto trunc;
1257 #undef REDIRECTLEN
1258 }
1259 }
1260 break;
1261 case ICMP6_ROUTER_RENUMBERING:
1262 icmp6_rrenum_print(ndo, bp, ep);
1263 break;
1264 case ICMP6_NI_QUERY:
1265 case ICMP6_NI_REPLY:
1266 icmp6_nodeinfo_print(ndo, length, bp, ep);
1267 break;
1268 case IND_SOLICIT:
1269 case IND_ADVERT:
1270 break;
1271 case ICMP6_V2_MEMBERSHIP_REPORT:
1272 mldv2_report_print(ndo, (const u_char *) dp, length);
1273 break;
1274 case ICMP6_MOBILEPREFIX_SOLICIT: /* fall through */
1275 case ICMP6_HADISCOV_REQUEST:
1276 ND_PRINT(", id 0x%04x", GET_BE_U_2(dp->icmp6_data16[0]));
1277 break;
1278 case ICMP6_HADISCOV_REPLY:
1279 if (ndo->ndo_vflag) {
1280 const u_char *cp;
1281 const u_char *p;
1282
1283 ND_PRINT(", id 0x%04x",
1284 GET_BE_U_2(dp->icmp6_data16[0]));
1285 cp = (const u_char *)dp + length;
1286 p = (const u_char *)(dp + 1);
1287 while (p < cp) {
1288 ND_PRINT(", %s", GET_IP6ADDR_STRING(p));
1289 p += 16;
1290 }
1291 }
1292 break;
1293 case ICMP6_MOBILEPREFIX_ADVERT:
1294 if (ndo->ndo_vflag) {
1295 uint16_t flags;
1296
1297 ND_PRINT(", id 0x%04x",
1298 GET_BE_U_2(dp->icmp6_data16[0]));
1299 flags = GET_BE_U_2(dp->icmp6_data16[1]);
1300 if (flags & 0xc000)
1301 ND_PRINT(" ");
1302 if (flags & 0x8000)
1303 ND_PRINT("M");
1304 if (flags & 0x4000)
1305 ND_PRINT("O");
1306 #define MPADVLEN 8
1307 if (icmp6_opt_print(ndo, (const u_char *)dp + MPADVLEN,
1308 length - MPADVLEN) == -1)
1309 goto trunc;
1310 }
1311 break;
1312 case ND_RPL_MESSAGE:
1313 /* plus 4, because struct icmp6_hdr contains 4 bytes of icmp payload */
1314 rpl_print(ndo, icmp6_code, dp->icmp6_data, length-sizeof(struct icmp6_hdr)+4);
1315 break;
1316 default:
1317 ND_PRINT(", length %u", length);
1318 if (ndo->ndo_vflag <= 1)
1319 print_unknown_data(ndo, bp,"\n\t", length);
1320 return;
1321 }
1322 if (!ndo->ndo_vflag)
1323 ND_PRINT(", length %u", length);
1324 return;
1325 trunc:
1326 nd_print_trunc(ndo);
1327 }
1328
1329 static const struct udphdr *
1330 get_upperlayer(netdissect_options *ndo, const u_char *bp, u_int *prot)
1331 {
1332 const u_char *ep;
1333 const struct ip6_hdr *ip6 = (const struct ip6_hdr *)bp;
1334 const struct udphdr *uh;
1335 const struct ip6_hbh *hbh;
1336 const struct ip6_frag *fragh;
1337 const struct ah *ah;
1338 u_int nh;
1339 int hlen;
1340
1341 /* 'ep' points to the end of available data. */
1342 ep = ndo->ndo_snapend;
1343
1344 if (!ND_TTEST_1(ip6->ip6_nxt))
1345 return NULL;
1346
1347 nh = GET_U_1(ip6->ip6_nxt);
1348 hlen = sizeof(struct ip6_hdr);
1349
1350 while (bp < ep) {
1351 bp += hlen;
1352
1353 switch(nh) {
1354 case IPPROTO_UDP:
1355 case IPPROTO_TCP:
1356 uh = (const struct udphdr *)bp;
1357 if (ND_TTEST_2(uh->uh_dport)) {
1358 *prot = nh;
1359 return(uh);
1360 }
1361 else
1362 return(NULL);
1363 /* NOTREACHED */
1364
1365 case IPPROTO_HOPOPTS:
1366 case IPPROTO_DSTOPTS:
1367 case IPPROTO_ROUTING:
1368 hbh = (const struct ip6_hbh *)bp;
1369 if (!ND_TTEST_1(hbh->ip6h_len))
1370 return(NULL);
1371 nh = GET_U_1(hbh->ip6h_nxt);
1372 hlen = (GET_U_1(hbh->ip6h_len) + 1) << 3;
1373 break;
1374
1375 case IPPROTO_FRAGMENT: /* this should be odd, but try anyway */
1376 fragh = (const struct ip6_frag *)bp;
1377 if (!ND_TTEST_2(fragh->ip6f_offlg))
1378 return(NULL);
1379 /* fragments with non-zero offset are meaningless */
1380 if ((GET_BE_U_2(fragh->ip6f_offlg) & IP6F_OFF_MASK) != 0)
1381 return(NULL);
1382 nh = GET_U_1(fragh->ip6f_nxt);
1383 hlen = sizeof(struct ip6_frag);
1384 break;
1385
1386 case IPPROTO_AH:
1387 ah = (const struct ah *)bp;
1388 if (!ND_TTEST_1(ah->ah_len))
1389 return(NULL);
1390 nh = GET_U_1(ah->ah_nxt);
1391 hlen = (GET_U_1(ah->ah_len) + 2) << 2;
1392 break;
1393
1394 default: /* unknown or undecodable header */
1395 *prot = nh; /* meaningless, but set here anyway */
1396 return(NULL);
1397 }
1398 }
1399
1400 return(NULL); /* should be notreached, though */
1401 }
1402
1403 static int
1404 icmp6_opt_print(netdissect_options *ndo, const u_char *bp, int resid)
1405 {
1406 const struct nd_opt_hdr *op;
1407 uint8_t opt_type;
1408 u_int opt_len;
1409 const struct nd_opt_prefix_info *opp;
1410 const struct nd_opt_mtu *opm;
1411 const struct nd_opt_rdnss *oprd;
1412 const struct nd_opt_dnssl *opds;
1413 const struct nd_opt_advinterval *opa;
1414 const struct nd_opt_homeagent_info *oph;
1415 const struct nd_opt_route_info *opri;
1416 const u_char *cp, *ep, *domp;
1417 nd_ipv6 in6;
1418 size_t l;
1419 u_int i;
1420
1421 cp = bp;
1422 /* 'ep' points to the end of available data. */
1423 ep = ndo->ndo_snapend;
1424
1425 while (cp < ep) {
1426 op = (const struct nd_opt_hdr *)cp;
1427
1428 ND_TCHECK_1(op->nd_opt_len);
1429 if (resid <= 0)
1430 return 0;
1431 opt_type = GET_U_1(op->nd_opt_type);
1432 opt_len = GET_U_1(op->nd_opt_len);
1433 if (opt_len == 0)
1434 goto trunc;
1435 if (cp + (opt_len << 3) > ep)
1436 goto trunc;
1437
1438 ND_PRINT("\n\t %s option (%u), length %u (%u): ",
1439 tok2str(icmp6_opt_values, "unknown", opt_type),
1440 opt_type,
1441 opt_len << 3,
1442 opt_len);
1443
1444 switch (opt_type) {
1445 case ND_OPT_SOURCE_LINKADDR:
1446 l = (opt_len << 3) - 2;
1447 print_lladdr(ndo, cp + 2, l);
1448 break;
1449 case ND_OPT_TARGET_LINKADDR:
1450 l = (opt_len << 3) - 2;
1451 print_lladdr(ndo, cp + 2, l);
1452 break;
1453 case ND_OPT_PREFIX_INFORMATION:
1454 opp = (const struct nd_opt_prefix_info *)op;
1455 ND_PRINT("%s/%u%s, Flags [%s], valid time %s",
1456 GET_IP6ADDR_STRING(opp->nd_opt_pi_prefix),
1457 GET_U_1(opp->nd_opt_pi_prefix_len),
1458 (opt_len != 4) ? "badlen" : "",
1459 bittok2str(icmp6_opt_pi_flag_values, "none", GET_U_1(opp->nd_opt_pi_flags_reserved)),
1460 get_lifetime(GET_BE_U_4(opp->nd_opt_pi_valid_time)));
1461 ND_PRINT(", pref. time %s",
1462 get_lifetime(GET_BE_U_4(opp->nd_opt_pi_preferred_time)));
1463 break;
1464 case ND_OPT_REDIRECTED_HEADER:
1465 print_unknown_data(ndo, bp,"\n\t ",opt_len<<3);
1466 /* xxx */
1467 break;
1468 case ND_OPT_MTU:
1469 opm = (const struct nd_opt_mtu *)op;
1470 ND_PRINT(" %u%s",
1471 GET_BE_U_4(opm->nd_opt_mtu_mtu),
1472 (opt_len != 1) ? "bad option length" : "" );
1473 break;
1474 case ND_OPT_RDNSS:
1475 oprd = (const struct nd_opt_rdnss *)op;
1476 l = (opt_len - 1) / 2;
1477 ND_PRINT(" lifetime %us,",
1478 GET_BE_U_4(oprd->nd_opt_rdnss_lifetime));
1479 for (i = 0; i < l; i++) {
1480 ND_PRINT(" addr: %s",
1481 GET_IP6ADDR_STRING(oprd->nd_opt_rdnss_addr[i]));
1482 }
1483 break;
1484 case ND_OPT_DNSSL:
1485 opds = (const struct nd_opt_dnssl *)op;
1486 ND_PRINT(" lifetime %us, domain(s):",
1487 GET_BE_U_4(opds->nd_opt_dnssl_lifetime));
1488 domp = cp + 8; /* domain names, variable-sized, RFC1035-encoded */
1489 while (domp < cp + (opt_len << 3) && GET_U_1(domp) != '\0')
1490 {
1491 ND_PRINT(" ");
1492 if ((domp = fqdn_print(ndo, domp, bp)) == NULL)
1493 goto trunc;
1494 }
1495 break;
1496 case ND_OPT_ADVINTERVAL:
1497 opa = (const struct nd_opt_advinterval *)op;
1498 ND_PRINT(" %ums",
1499 GET_BE_U_4(opa->nd_opt_adv_interval));
1500 break;
1501 case ND_OPT_HOMEAGENT_INFO:
1502 oph = (const struct nd_opt_homeagent_info *)op;
1503 ND_PRINT(" preference %u, lifetime %u",
1504 GET_BE_U_2(oph->nd_opt_hai_preference),
1505 GET_BE_U_2(oph->nd_opt_hai_lifetime));
1506 break;
1507 case ND_OPT_ROUTE_INFO:
1508 opri = (const struct nd_opt_route_info *)op;
1509 ND_TCHECK_4(opri->nd_opt_rti_lifetime);
1510 memset(&in6, 0, sizeof(in6));
1511 switch (opt_len) {
1512 case 1:
1513 break;
1514 case 2:
1515 GET_CPY_BYTES(&in6, opri + 1, 8);
1516 break;
1517 case 3:
1518 GET_CPY_BYTES(&in6, opri + 1, 16);
1519 break;
1520 default:
1521 goto trunc;
1522 }
1523 ND_PRINT(" %s/%u", ip6addr_string(ndo, (const u_char *)&in6),
1524 GET_U_1(opri->nd_opt_rti_prefixlen));
1525 ND_PRINT(", pref=%s",
1526 get_rtpref(GET_U_1(opri->nd_opt_rti_flags)));
1527 ND_PRINT(", lifetime=%s",
1528 get_lifetime(GET_BE_U_4(opri->nd_opt_rti_lifetime)));
1529 break;
1530 default:
1531 if (ndo->ndo_vflag <= 1) {
1532 print_unknown_data(ndo,cp+2,"\n\t ", (opt_len << 3) - 2); /* skip option header */
1533 return 0;
1534 }
1535 break;
1536 }
1537 /* do we want to see an additional hexdump ? */
1538 if (ndo->ndo_vflag> 1)
1539 print_unknown_data(ndo, cp+2,"\n\t ", (opt_len << 3) - 2); /* skip option header */
1540
1541 cp += opt_len << 3;
1542 resid -= opt_len << 3;
1543 }
1544 return 0;
1545
1546 trunc:
1547 return -1;
1548 }
1549
1550 static void
1551 mld6_print(netdissect_options *ndo, const u_char *bp)
1552 {
1553 const struct mld6_hdr *mp = (const struct mld6_hdr *)bp;
1554 const u_char *ep;
1555
1556 /* 'ep' points to the end of available data. */
1557 ep = ndo->ndo_snapend;
1558
1559 if ((const u_char *)mp + sizeof(*mp) > ep)
1560 return;
1561
1562 ND_PRINT("max resp delay: %u ", GET_BE_U_2(mp->mld6_maxdelay));
1563 ND_PRINT("addr: %s", GET_IP6ADDR_STRING(mp->mld6_addr));
1564 }
1565
1566 static void
1567 mldv2_report_print(netdissect_options *ndo, const u_char *bp, u_int len)
1568 {
1569 const struct icmp6_hdr *icp = (const struct icmp6_hdr *) bp;
1570 u_int group, nsrcs, ngroups;
1571 u_int i, j;
1572
1573 /* Minimum len is 8 */
1574 if (len < 8) {
1575 ND_PRINT(" [invalid len %u]", len);
1576 return;
1577 }
1578
1579 ngroups = GET_BE_U_2(icp->icmp6_data16[1]);
1580 ND_PRINT(", %u group record(s)", ngroups);
1581 if (ndo->ndo_vflag > 0) {
1582 /* Print the group records */
1583 group = 8;
1584 for (i = 0; i < ngroups; i++) {
1585 /* type(1) + auxlen(1) + numsrc(2) + grp(16) */
1586 if (len < group + 20) {
1587 ND_PRINT(" [invalid number of groups]");
1588 return;
1589 }
1590 ND_PRINT(" [gaddr %s", GET_IP6ADDR_STRING(bp + group + 4));
1591 ND_PRINT(" %s", tok2str(mldv2report2str, " [v2-report-#%u]",
1592 GET_U_1(bp + group)));
1593 nsrcs = GET_BE_U_2(bp + group + 2);
1594 /* Check the number of sources and print them */
1595 if (len < group + 20 + (nsrcs * sizeof(nd_ipv6))) {
1596 ND_PRINT(" [invalid number of sources %u]", nsrcs);
1597 return;
1598 }
1599 if (ndo->ndo_vflag == 1)
1600 ND_PRINT(", %u source(s)", nsrcs);
1601 else {
1602 /* Print the sources */
1603 ND_PRINT(" {");
1604 for (j = 0; j < nsrcs; j++) {
1605 ND_PRINT(" %s", GET_IP6ADDR_STRING(bp + group + 20 + (j * sizeof(nd_ipv6))));
1606 }
1607 ND_PRINT(" }");
1608 }
1609 /* Next group record */
1610 group += 20 + nsrcs * sizeof(nd_ipv6);
1611 ND_PRINT("]");
1612 }
1613 }
1614 }
1615
1616 static void
1617 mldv2_query_print(netdissect_options *ndo, const u_char *bp, u_int len)
1618 {
1619 const struct icmp6_hdr *icp = (const struct icmp6_hdr *) bp;
1620 u_int mrc;
1621 u_int mrt, qqi;
1622 u_int nsrcs;
1623 u_int i;
1624
1625 /* Minimum len is 28 */
1626 if (len < 28) {
1627 ND_PRINT(" [invalid len %u]", len);
1628 return;
1629 }
1630 mrc = GET_BE_U_2(icp->icmp6_data16[0]);
1631 if (mrc < 32768) {
1632 mrt = mrc;
1633 } else {
1634 mrt = ((mrc & 0x0fff) | 0x1000) << (((mrc & 0x7000) >> 12) + 3);
1635 }
1636 if (ndo->ndo_vflag) {
1637 ND_PRINT(" [max resp delay=%u]", mrt);
1638 }
1639 ND_PRINT(" [gaddr %s", GET_IP6ADDR_STRING(bp + 8));
1640
1641 if (ndo->ndo_vflag) {
1642 if (GET_U_1(bp + 24) & 0x08) {
1643 ND_PRINT(" sflag");
1644 }
1645 if (GET_U_1(bp + 24) & 0x07) {
1646 ND_PRINT(" robustness=%u", GET_U_1(bp + 24) & 0x07);
1647 }
1648 if (GET_U_1(bp + 25) < 128) {
1649 qqi = GET_U_1(bp + 25);
1650 } else {
1651 qqi = ((GET_U_1(bp + 25) & 0x0f) | 0x10) <<
1652 (((GET_U_1(bp + 25) & 0x70) >> 4) + 3);
1653 }
1654 ND_PRINT(" qqi=%u", qqi);
1655 }
1656
1657 nsrcs = GET_BE_U_2(bp + 26);
1658 if (nsrcs > 0) {
1659 if (len < 28 + nsrcs * sizeof(nd_ipv6))
1660 ND_PRINT(" [invalid number of sources]");
1661 else if (ndo->ndo_vflag > 1) {
1662 ND_PRINT(" {");
1663 for (i = 0; i < nsrcs; i++) {
1664 ND_PRINT(" %s", GET_IP6ADDR_STRING(bp + 28 + (i * sizeof(nd_ipv6))));
1665 }
1666 ND_PRINT(" }");
1667 } else
1668 ND_PRINT(", %u source(s)", nsrcs);
1669 }
1670 ND_PRINT("]");
1671 }
1672
1673 static void
1674 dnsname_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
1675 {
1676 int i;
1677
1678 /* DNS name decoding - no decompression */
1679 ND_PRINT(", \"");
1680 while (cp < ep) {
1681 i = GET_U_1(cp);
1682 cp++;
1683 if (i) {
1684 if (i > ep - cp) {
1685 ND_PRINT("???");
1686 break;
1687 }
1688 while (i-- && cp < ep) {
1689 fn_print_char(ndo, GET_U_1(cp));
1690 cp++;
1691 }
1692 if (cp + 1 < ep && GET_U_1(cp))
1693 ND_PRINT(".");
1694 } else {
1695 if (cp == ep) {
1696 /* FQDN */
1697 ND_PRINT(".");
1698 } else if (cp + 1 == ep && GET_U_1(cp) == '\0') {
1699 /* truncated */
1700 } else {
1701 /* invalid */
1702 ND_PRINT("???");
1703 }
1704 break;
1705 }
1706 }
1707 ND_PRINT("\"");
1708 }
1709
1710 static void
1711 icmp6_nodeinfo_print(netdissect_options *ndo, u_int icmp6len, const u_char *bp, const u_char *ep)
1712 {
1713 const struct icmp6_nodeinfo *ni6;
1714 const struct icmp6_hdr *dp;
1715 const u_char *cp;
1716 size_t siz, i;
1717 int needcomma;
1718
1719 if (ep < bp)
1720 return;
1721 dp = (const struct icmp6_hdr *)bp;
1722 ni6 = (const struct icmp6_nodeinfo *)bp;
1723 siz = ep - bp;
1724
1725 switch (GET_U_1(ni6->ni_type)) {
1726 case ICMP6_NI_QUERY:
1727 if (siz == sizeof(*dp) + 4) {
1728 /* KAME who-are-you */
1729 ND_PRINT(" who-are-you request");
1730 break;
1731 }
1732 ND_PRINT(" node information query");
1733
1734 ND_TCHECK_LEN(dp, sizeof(*ni6));
1735 ni6 = (const struct icmp6_nodeinfo *)dp;
1736 ND_PRINT(" ("); /*)*/
1737 switch (GET_BE_U_2(ni6->ni_qtype)) {
1738 case NI_QTYPE_NOOP:
1739 ND_PRINT("noop");
1740 break;
1741 case NI_QTYPE_SUPTYPES:
1742 ND_PRINT("supported qtypes");
1743 i = GET_BE_U_2(ni6->ni_flags);
1744 if (i)
1745 ND_PRINT(" [%s]", (i & 0x01) ? "C" : "");
1746 break;
1747 case NI_QTYPE_FQDN:
1748 ND_PRINT("DNS name");
1749 break;
1750 case NI_QTYPE_NODEADDR:
1751 ND_PRINT("node addresses");
1752 i = GET_BE_U_2(ni6->ni_flags);
1753 if (!i)
1754 break;
1755 /* NI_NODEADDR_FLAG_TRUNCATE undefined for query */
1756 ND_PRINT(" [%s%s%s%s%s%s]",
1757 (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
1758 (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
1759 (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
1760 (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
1761 (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
1762 (i & NI_NODEADDR_FLAG_ALL) ? "A" : "");
1763 break;
1764 default:
1765 ND_PRINT("unknown");
1766 break;
1767 }
1768
1769 if (GET_BE_U_2(ni6->ni_qtype) == NI_QTYPE_NOOP ||
1770 GET_BE_U_2(ni6->ni_qtype) == NI_QTYPE_SUPTYPES) {
1771 if (siz != sizeof(*ni6))
1772 if (ndo->ndo_vflag)
1773 ND_PRINT(", invalid len");
1774 /*(*/
1775 ND_PRINT(")");
1776 break;
1777 }
1778
1779
1780 /* XXX backward compat, icmp-name-lookup-03 */
1781 if (siz == sizeof(*ni6)) {
1782 ND_PRINT(", 03 draft");
1783 /*(*/
1784 ND_PRINT(")");
1785 break;
1786 }
1787
1788 cp = (const u_char *)(ni6 + 1);
1789 switch (GET_U_1(ni6->ni_code)) {
1790 case ICMP6_NI_SUBJ_IPV6:
1791 if (!ND_TTEST_LEN(dp, sizeof(*ni6) + sizeof(nd_ipv6)))
1792 break;
1793 if (siz != sizeof(*ni6) + sizeof(nd_ipv6)) {
1794 if (ndo->ndo_vflag)
1795 ND_PRINT(", invalid subject len");
1796 break;
1797 }
1798 ND_PRINT(", subject=%s",
1799 GET_IP6ADDR_STRING(cp));
1800 break;
1801 case ICMP6_NI_SUBJ_FQDN:
1802 ND_PRINT(", subject=DNS name");
1803 if (GET_U_1(cp) == ep - cp - 1) {
1804 /* icmp-name-lookup-03, pascal string */
1805 if (ndo->ndo_vflag)
1806 ND_PRINT(", 03 draft");
1807 cp++;
1808 ND_PRINT(", \"");
1809 while (cp < ep) {
1810 fn_print_char(ndo, GET_U_1(cp));
1811 cp++;
1812 }
1813 ND_PRINT("\"");
1814 } else
1815 dnsname_print(ndo, cp, ep);
1816 break;
1817 case ICMP6_NI_SUBJ_IPV4:
1818 if (!ND_TTEST_LEN(dp, sizeof(*ni6) + sizeof(nd_ipv4)))
1819 break;
1820 if (siz != sizeof(*ni6) + sizeof(nd_ipv4)) {
1821 if (ndo->ndo_vflag)
1822 ND_PRINT(", invalid subject len");
1823 break;
1824 }
1825 ND_PRINT(", subject=%s",
1826 GET_IPADDR_STRING(cp));
1827 break;
1828 default:
1829 ND_PRINT(", unknown subject");
1830 break;
1831 }
1832
1833 /*(*/
1834 ND_PRINT(")");
1835 break;
1836
1837 case ICMP6_NI_REPLY:
1838 if (icmp6len > siz)
1839 goto trunc;
1840
1841 needcomma = 0;
1842
1843 ND_TCHECK_LEN(dp, sizeof(*ni6));
1844 ni6 = (const struct icmp6_nodeinfo *)dp;
1845 ND_PRINT(" node information reply");
1846 ND_PRINT(" ("); /*)*/
1847 switch (GET_U_1(ni6->ni_code)) {
1848 case ICMP6_NI_SUCCESS:
1849 if (ndo->ndo_vflag) {
1850 ND_PRINT("success");
1851 needcomma++;
1852 }
1853 break;
1854 case ICMP6_NI_REFUSED:
1855 ND_PRINT("refused");
1856 needcomma++;
1857 if (siz != sizeof(*ni6))
1858 if (ndo->ndo_vflag)
1859 ND_PRINT(", invalid length");
1860 break;
1861 case ICMP6_NI_UNKNOWN:
1862 ND_PRINT("unknown");
1863 needcomma++;
1864 if (siz != sizeof(*ni6))
1865 if (ndo->ndo_vflag)
1866 ND_PRINT(", invalid length");
1867 break;
1868 }
1869
1870 if (GET_U_1(ni6->ni_code) != ICMP6_NI_SUCCESS) {
1871 /*(*/
1872 ND_PRINT(")");
1873 break;
1874 }
1875
1876 switch (GET_BE_U_2(ni6->ni_qtype)) {
1877 case NI_QTYPE_NOOP:
1878 if (needcomma)
1879 ND_PRINT(", ");
1880 ND_PRINT("noop");
1881 if (siz != sizeof(*ni6))
1882 if (ndo->ndo_vflag)
1883 ND_PRINT(", invalid length");
1884 break;
1885 case NI_QTYPE_SUPTYPES:
1886 if (needcomma)
1887 ND_PRINT(", ");
1888 ND_PRINT("supported qtypes");
1889 i = GET_BE_U_2(ni6->ni_flags);
1890 if (i)
1891 ND_PRINT(" [%s]", (i & 0x01) ? "C" : "");
1892 break;
1893 case NI_QTYPE_FQDN:
1894 if (needcomma)
1895 ND_PRINT(", ");
1896 ND_PRINT("DNS name");
1897 cp = (const u_char *)(ni6 + 1) + 4;
1898 if (GET_U_1(cp) == ep - cp - 1) {
1899 /* icmp-name-lookup-03, pascal string */
1900 if (ndo->ndo_vflag)
1901 ND_PRINT(", 03 draft");
1902 cp++;
1903 ND_PRINT(", \"");
1904 while (cp < ep) {
1905 fn_print_char(ndo, GET_U_1(cp));
1906 cp++;
1907 }
1908 ND_PRINT("\"");
1909 } else
1910 dnsname_print(ndo, cp, ep);
1911 if ((GET_BE_U_2(ni6->ni_flags) & 0x01) != 0)
1912 ND_PRINT(" [TTL=%u]", GET_BE_U_4(ni6 + 1));
1913 break;
1914 case NI_QTYPE_NODEADDR:
1915 if (needcomma)
1916 ND_PRINT(", ");
1917 ND_PRINT("node addresses");
1918 i = sizeof(*ni6);
1919 while (i < siz) {
1920 if (i + sizeof(uint32_t) + sizeof(nd_ipv6) > siz)
1921 break;
1922 ND_PRINT(" %s(%u)",
1923 GET_IP6ADDR_STRING(bp + i + sizeof(uint32_t)),
1924 GET_BE_U_4(bp + i));
1925 i += sizeof(uint32_t) + sizeof(nd_ipv6);
1926 }
1927 i = GET_BE_U_2(ni6->ni_flags);
1928 if (!i)
1929 break;
1930 ND_PRINT(" [%s%s%s%s%s%s%s]",
1931 (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
1932 (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
1933 (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
1934 (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
1935 (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
1936 (i & NI_NODEADDR_FLAG_ALL) ? "A" : "",
1937 (i & NI_NODEADDR_FLAG_TRUNCATE) ? "T" : "");
1938 break;
1939 default:
1940 if (needcomma)
1941 ND_PRINT(", ");
1942 ND_PRINT("unknown");
1943 break;
1944 }
1945
1946 /*(*/
1947 ND_PRINT(")");
1948 break;
1949 }
1950 return;
1951
1952 trunc:
1953 nd_print_trunc(ndo);
1954 }
1955
1956 static void
1957 icmp6_rrenum_print(netdissect_options *ndo, const u_char *bp, const u_char *ep)
1958 {
1959 const struct icmp6_router_renum *rr6;
1960 const char *cp;
1961 const struct rr_pco_match *match;
1962 const struct rr_pco_use *use;
1963 char hbuf[NI_MAXHOST];
1964 int n;
1965
1966 if (ep < bp)
1967 return;
1968 rr6 = (const struct icmp6_router_renum *)bp;
1969 cp = (const char *)(rr6 + 1);
1970
1971 ND_TCHECK_4(rr6->rr_reserved);
1972 switch (GET_U_1(rr6->rr_code)) {
1973 case ICMP6_ROUTER_RENUMBERING_COMMAND:
1974 ND_PRINT("router renum: command");
1975 break;
1976 case ICMP6_ROUTER_RENUMBERING_RESULT:
1977 ND_PRINT("router renum: result");
1978 break;
1979 case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
1980 ND_PRINT("router renum: sequence number reset");
1981 break;
1982 default:
1983 ND_PRINT("router renum: code-#%u", GET_U_1(rr6->rr_code));
1984 break;
1985 }
1986
1987 ND_PRINT(", seq=%u", GET_BE_U_4(rr6->rr_seqnum));
1988
1989 if (ndo->ndo_vflag) {
1990 uint8_t rr_flags = GET_U_1(rr6->rr_flags);
1991 #define F(x, y) (rr_flags & (x) ? (y) : "")
1992 ND_PRINT("["); /*]*/
1993 if (rr_flags) {
1994 ND_PRINT("%s%s%s%s%s,", F(ICMP6_RR_FLAGS_TEST, "T"),
1995 F(ICMP6_RR_FLAGS_REQRESULT, "R"),
1996 F(ICMP6_RR_FLAGS_FORCEAPPLY, "A"),
1997 F(ICMP6_RR_FLAGS_SPECSITE, "S"),
1998 F(ICMP6_RR_FLAGS_PREVDONE, "P"));
1999 }
2000 ND_PRINT("seg=%u,", GET_U_1(rr6->rr_segnum));
2001 ND_PRINT("maxdelay=%u", GET_BE_U_2(rr6->rr_maxdelay));
2002 if (GET_BE_U_4(rr6->rr_reserved))
2003 ND_PRINT("rsvd=0x%x", GET_BE_U_4(rr6->rr_reserved));
2004 /*[*/
2005 ND_PRINT("]");
2006 #undef F
2007 }
2008
2009 if (GET_U_1(rr6->rr_code) == ICMP6_ROUTER_RENUMBERING_COMMAND) {
2010 match = (const struct rr_pco_match *)cp;
2011 cp = (const char *)(match + 1);
2012
2013 ND_TCHECK_16(match->rpm_prefix);
2014
2015 if (ndo->ndo_vflag > 1)
2016 ND_PRINT("\n\t");
2017 else
2018 ND_PRINT(" ");
2019 ND_PRINT("match("); /*)*/
2020 switch (GET_U_1(match->rpm_code)) {
2021 case RPM_PCO_ADD: ND_PRINT("add"); break;
2022 case RPM_PCO_CHANGE: ND_PRINT("change"); break;
2023 case RPM_PCO_SETGLOBAL: ND_PRINT("setglobal"); break;
2024 default: ND_PRINT("#%u",
2025 GET_U_1(match->rpm_code)); break;
2026 }
2027
2028 if (ndo->ndo_vflag) {
2029 ND_PRINT(",ord=%u", GET_U_1(match->rpm_ordinal));
2030 ND_PRINT(",min=%u", GET_U_1(match->rpm_minlen));
2031 ND_PRINT(",max=%u", GET_U_1(match->rpm_maxlen));
2032 }
2033 if (addrtostr6(match->rpm_prefix, hbuf, sizeof(hbuf)))
2034 ND_PRINT(",%s/%u", hbuf, GET_U_1(match->rpm_matchlen));
2035 else
2036 ND_PRINT(",?/%u", GET_U_1(match->rpm_matchlen));
2037 /*(*/
2038 ND_PRINT(")");
2039
2040 n = GET_U_1(match->rpm_len) - 3;
2041 if (n % 4)
2042 goto trunc;
2043 n /= 4;
2044 while (n-- > 0) {
2045 use = (const struct rr_pco_use *)cp;
2046 cp = (const char *)(use + 1);
2047
2048 ND_TCHECK_16(use->rpu_prefix);
2049
2050 if (ndo->ndo_vflag > 1)
2051 ND_PRINT("\n\t");
2052 else
2053 ND_PRINT(" ");
2054 ND_PRINT("use("); /*)*/
2055 if (GET_U_1(use->rpu_flags)) {
2056 #define F(x, y) (GET_U_1(use->rpu_flags) & (x) ? (y) : "")
2057 ND_PRINT("%s%s,",
2058 F(ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME, "V"),
2059 F(ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME, "P"));
2060 #undef F
2061 }
2062 if (ndo->ndo_vflag) {
2063 ND_PRINT("mask=0x%x,",
2064 GET_U_1(use->rpu_ramask));
2065 ND_PRINT("raflags=0x%x,",
2066 GET_U_1(use->rpu_raflags));
2067 if (GET_BE_U_4(use->rpu_vltime) == 0xffffffff)
2068 ND_PRINT("vltime=infty,");
2069 else
2070 ND_PRINT("vltime=%u,",
2071 GET_BE_U_4(use->rpu_vltime));
2072 if (GET_BE_U_4(use->rpu_pltime) == 0xffffffff)
2073 ND_PRINT("pltime=infty,");
2074 else
2075 ND_PRINT("pltime=%u,",
2076 GET_BE_U_4(use->rpu_pltime));
2077 }
2078 if (addrtostr6(use->rpu_prefix, hbuf, sizeof(hbuf)))
2079 ND_PRINT("%s/%u/%u", hbuf,
2080 GET_U_1(use->rpu_uselen),
2081 GET_U_1(use->rpu_keeplen));
2082 else
2083 ND_PRINT("?/%u/%u", GET_U_1(use->rpu_uselen),
2084 GET_U_1(use->rpu_keeplen));
2085 /*(*/
2086 ND_PRINT(")");
2087 }
2088 }
2089
2090 return;
2091
2092 trunc:
2093 nd_print_trunc(ndo);
2094 }
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