1 /*
2 * Copyright (c) 2007-2011 Grégoire Henry, Juliusz Chroboczek
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the project nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /* \summary: Babel Routing Protocol printer */
30
31 #ifdef HAVE_CONFIG_H
32 #include "config.h"
33 #endif
34
35 #include <netdissect-stdinc.h>
36
37 #include <stdio.h>
38 #include <string.h>
39
40 #include "netdissect.h"
41 #include "addrtoname.h"
42 #include "extract.h"
43
44 static const char tstr[] = "[|babel]";
45
46 static void babel_print_v2(netdissect_options *, const u_char *cp, u_int length);
47
48 void
babel_print(netdissect_options * ndo,const u_char * cp,u_int length)49 babel_print(netdissect_options *ndo,
50 const u_char *cp, u_int length)
51 {
52 ND_PRINT((ndo, "babel"));
53
54 ND_TCHECK2(*cp, 4);
55
56 if(cp[0] != 42) {
57 ND_PRINT((ndo, " invalid header"));
58 return;
59 } else {
60 ND_PRINT((ndo, " %d", cp[1]));
61 }
62
63 switch(cp[1]) {
64 case 2:
65 babel_print_v2(ndo, cp, length);
66 break;
67 default:
68 ND_PRINT((ndo, " unknown version"));
69 break;
70 }
71
72 return;
73
74 trunc:
75 ND_PRINT((ndo, " %s", tstr));
76 return;
77 }
78
79 /* TLVs */
80 #define MESSAGE_PAD1 0
81 #define MESSAGE_PADN 1
82 #define MESSAGE_ACK_REQ 2
83 #define MESSAGE_ACK 3
84 #define MESSAGE_HELLO 4
85 #define MESSAGE_IHU 5
86 #define MESSAGE_ROUTER_ID 6
87 #define MESSAGE_NH 7
88 #define MESSAGE_UPDATE 8
89 #define MESSAGE_REQUEST 9
90 #define MESSAGE_MH_REQUEST 10
91 #define MESSAGE_TSPC 11
92 #define MESSAGE_HMAC 12
93 #define MESSAGE_UPDATE_SRC_SPECIFIC 13
94 #define MESSAGE_REQUEST_SRC_SPECIFIC 14
95 #define MESSAGE_MH_REQUEST_SRC_SPECIFIC 15
96
97 /* sub-TLVs */
98 #define MESSAGE_SUB_PAD1 0
99 #define MESSAGE_SUB_PADN 1
100 #define MESSAGE_SUB_DIVERSITY 2
101 #define MESSAGE_SUB_TIMESTAMP 3
102
103 /* Diversity sub-TLV channel codes */
104 static const struct tok diversity_str[] = {
105 { 0, "reserved" },
106 { 255, "all" },
107 { 0, NULL }
108 };
109
110 static const char *
format_id(const u_char * id)111 format_id(const u_char *id)
112 {
113 static char buf[25];
114 snprintf(buf, 25, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
115 id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7]);
116 buf[24] = '\0';
117 return buf;
118 }
119
120 static const unsigned char v4prefix[16] =
121 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
122
123 static const char *
format_prefix(netdissect_options * ndo,const u_char * prefix,unsigned char plen)124 format_prefix(netdissect_options *ndo, const u_char *prefix, unsigned char plen)
125 {
126 static char buf[50];
127 if(plen >= 96 && memcmp(prefix, v4prefix, 12) == 0)
128 snprintf(buf, 50, "%s/%u", ipaddr_string(ndo, prefix + 12), plen - 96);
129 else
130 snprintf(buf, 50, "%s/%u", ip6addr_string(ndo, prefix), plen);
131 buf[49] = '\0';
132 return buf;
133 }
134
135 static const char *
format_address(netdissect_options * ndo,const u_char * prefix)136 format_address(netdissect_options *ndo, const u_char *prefix)
137 {
138 if(memcmp(prefix, v4prefix, 12) == 0)
139 return ipaddr_string(ndo, prefix + 12);
140 else
141 return ip6addr_string(ndo, prefix);
142 }
143
144 static const char *
format_interval(const uint16_t i)145 format_interval(const uint16_t i)
146 {
147 static char buf[sizeof("000.00s")];
148
149 if (i == 0)
150 return "0.0s (bogus)";
151 snprintf(buf, sizeof(buf), "%u.%02us", i / 100, i % 100);
152 return buf;
153 }
154
155 static const char *
format_interval_update(const uint16_t i)156 format_interval_update(const uint16_t i)
157 {
158 return i == 0xFFFF ? "infinity" : format_interval(i);
159 }
160
161 static const char *
format_timestamp(const uint32_t i)162 format_timestamp(const uint32_t i)
163 {
164 static char buf[sizeof("0000.000000s")];
165 snprintf(buf, sizeof(buf), "%u.%06us", i / 1000000, i % 1000000);
166 return buf;
167 }
168
169 /* Return number of octets consumed from the input buffer (not the prefix length
170 * in bytes), or -1 for encoding error. */
171 static int
network_prefix(int ae,int plen,unsigned int omitted,const unsigned char * p,const unsigned char * dp,unsigned int len,unsigned char * p_r)172 network_prefix(int ae, int plen, unsigned int omitted,
173 const unsigned char *p, const unsigned char *dp,
174 unsigned int len, unsigned char *p_r)
175 {
176 unsigned pb;
177 unsigned char prefix[16];
178 int consumed = 0;
179
180 if(plen >= 0)
181 pb = (plen + 7) / 8;
182 else if(ae == 1)
183 pb = 4;
184 else
185 pb = 16;
186
187 if(pb > 16)
188 return -1;
189
190 memset(prefix, 0, 16);
191
192 switch(ae) {
193 case 0: break;
194 case 1:
195 if(omitted > 4 || pb > 4 || (pb > omitted && len < pb - omitted))
196 return -1;
197 memcpy(prefix, v4prefix, 12);
198 if(omitted) {
199 if (dp == NULL) return -1;
200 memcpy(prefix, dp, 12 + omitted);
201 }
202 if(pb > omitted) {
203 memcpy(prefix + 12 + omitted, p, pb - omitted);
204 consumed = pb - omitted;
205 }
206 break;
207 case 2:
208 if(omitted > 16 || (pb > omitted && len < pb - omitted))
209 return -1;
210 if(omitted) {
211 if (dp == NULL) return -1;
212 memcpy(prefix, dp, omitted);
213 }
214 if(pb > omitted) {
215 memcpy(prefix + omitted, p, pb - omitted);
216 consumed = pb - omitted;
217 }
218 break;
219 case 3:
220 if(pb > 8 && len < pb - 8) return -1;
221 prefix[0] = 0xfe;
222 prefix[1] = 0x80;
223 if(pb > 8) {
224 memcpy(prefix + 8, p, pb - 8);
225 consumed = pb - 8;
226 }
227 break;
228 default:
229 return -1;
230 }
231
232 memcpy(p_r, prefix, 16);
233 return consumed;
234 }
235
236 static int
network_address(int ae,const unsigned char * a,unsigned int len,unsigned char * a_r)237 network_address(int ae, const unsigned char *a, unsigned int len,
238 unsigned char *a_r)
239 {
240 return network_prefix(ae, -1, 0, a, NULL, len, a_r);
241 }
242
243 /*
244 * Sub-TLVs consume the "extra data" of Babel TLVs (see Section 4.3 of RFC6126),
245 * their encoding is similar to the encoding of TLVs, but the type namespace is
246 * different:
247 *
248 * o Type 0 stands for Pad1 sub-TLV with the same encoding as the Pad1 TLV.
249 * o Type 1 stands for PadN sub-TLV with the same encoding as the PadN TLV.
250 * o Type 2 stands for Diversity sub-TLV, which propagates diversity routing
251 * data. Its body is a variable-length sequence of 8-bit unsigned integers,
252 * each representing per-hop number of interferring radio channel for the
253 * prefix. Channel 0 is invalid and must not be used in the sub-TLV, channel
254 * 255 interferes with any other channel.
255 * o Type 3 stands for Timestamp sub-TLV, used to compute RTT between
256 * neighbours. In the case of a Hello TLV, the body stores a 32-bits
257 * timestamp, while in the case of a IHU TLV, two 32-bits timestamps are
258 * stored.
259 *
260 * Sub-TLV types 0 and 1 are valid for any TLV type, whether sub-TLV type 2 is
261 * only valid for TLV type 8 (Update). Note that within an Update TLV a missing
262 * Diversity sub-TLV is not the same as a Diversity sub-TLV with an empty body.
263 * The former would mean a lack of any claims about the interference, and the
264 * latter would state that interference is definitely absent.
265 * A type 3 sub-TLV is valid both for Hello and IHU TLVs, though the exact
266 * semantic of the sub-TLV is different in each case.
267 */
268 static void
subtlvs_print(netdissect_options * ndo,const u_char * cp,const u_char * ep,const uint8_t tlv_type)269 subtlvs_print(netdissect_options *ndo,
270 const u_char *cp, const u_char *ep, const uint8_t tlv_type)
271 {
272 uint8_t subtype, sublen;
273 const char *sep;
274 uint32_t t1, t2;
275
276 while (cp < ep) {
277 subtype = *cp++;
278 if(subtype == MESSAGE_SUB_PAD1) {
279 ND_PRINT((ndo, " sub-pad1"));
280 continue;
281 }
282 if(cp == ep)
283 goto invalid;
284 sublen = *cp++;
285 if(cp + sublen > ep)
286 goto invalid;
287
288 switch(subtype) {
289 case MESSAGE_SUB_PADN:
290 ND_PRINT((ndo, " sub-padn"));
291 cp += sublen;
292 break;
293 case MESSAGE_SUB_DIVERSITY:
294 ND_PRINT((ndo, " sub-diversity"));
295 if (sublen == 0) {
296 ND_PRINT((ndo, " empty"));
297 break;
298 }
299 sep = " ";
300 while(sublen--) {
301 ND_PRINT((ndo, "%s%s", sep, tok2str(diversity_str, "%u", *cp++)));
302 sep = "-";
303 }
304 if(tlv_type != MESSAGE_UPDATE &&
305 tlv_type != MESSAGE_UPDATE_SRC_SPECIFIC)
306 ND_PRINT((ndo, " (bogus)"));
307 break;
308 case MESSAGE_SUB_TIMESTAMP:
309 ND_PRINT((ndo, " sub-timestamp"));
310 if(tlv_type == MESSAGE_HELLO) {
311 if(sublen < 4)
312 goto invalid;
313 t1 = EXTRACT_32BITS(cp);
314 ND_PRINT((ndo, " %s", format_timestamp(t1)));
315 } else if(tlv_type == MESSAGE_IHU) {
316 if(sublen < 8)
317 goto invalid;
318 t1 = EXTRACT_32BITS(cp);
319 ND_PRINT((ndo, " %s", format_timestamp(t1)));
320 t2 = EXTRACT_32BITS(cp + 4);
321 ND_PRINT((ndo, "|%s", format_timestamp(t2)));
322 } else
323 ND_PRINT((ndo, " (bogus)"));
324 cp += sublen;
325 break;
326 default:
327 ND_PRINT((ndo, " sub-unknown-0x%02x", subtype));
328 cp += sublen;
329 } /* switch */
330 } /* while */
331 return;
332
333 invalid:
334 ND_PRINT((ndo, "%s", istr));
335 }
336
337 #define ICHECK(i, l) \
338 if ((i) + (l) > bodylen || (i) + (l) > length) goto invalid;
339
340 static void
babel_print_v2(netdissect_options * ndo,const u_char * cp,u_int length)341 babel_print_v2(netdissect_options *ndo,
342 const u_char *cp, u_int length)
343 {
344 u_int i;
345 u_short bodylen;
346 u_char v4_prefix[16] =
347 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
348 u_char v6_prefix[16] = {0};
349
350 ND_TCHECK2(*cp, 4);
351 if (length < 4)
352 goto invalid;
353 bodylen = EXTRACT_16BITS(cp + 2);
354 ND_PRINT((ndo, " (%u)", bodylen));
355
356 /* Process the TLVs in the body */
357 i = 0;
358 while(i < bodylen) {
359 const u_char *message;
360 u_int type, len;
361
362 message = cp + 4 + i;
363
364 ND_TCHECK2(*message, 1);
365 if((type = message[0]) == MESSAGE_PAD1) {
366 ND_PRINT((ndo, ndo->ndo_vflag ? "\n\tPad 1" : " pad1"));
367 i += 1;
368 continue;
369 }
370
371 ND_TCHECK2(*message, 2);
372 ICHECK(i, 2);
373 len = message[1];
374
375 ND_TCHECK2(*message, 2 + len);
376 ICHECK(i, 2 + len);
377
378 switch(type) {
379 case MESSAGE_PADN: {
380 if (!ndo->ndo_vflag)
381 ND_PRINT((ndo, " padN"));
382 else
383 ND_PRINT((ndo, "\n\tPad %d", len + 2));
384 }
385 break;
386
387 case MESSAGE_ACK_REQ: {
388 u_short nonce, interval;
389 if (!ndo->ndo_vflag)
390 ND_PRINT((ndo, " ack-req"));
391 else {
392 ND_PRINT((ndo, "\n\tAcknowledgment Request "));
393 if(len < 6) goto invalid;
394 nonce = EXTRACT_16BITS(message + 4);
395 interval = EXTRACT_16BITS(message + 6);
396 ND_PRINT((ndo, "%04x %s", nonce, format_interval(interval)));
397 }
398 }
399 break;
400
401 case MESSAGE_ACK: {
402 u_short nonce;
403 if (!ndo->ndo_vflag)
404 ND_PRINT((ndo, " ack"));
405 else {
406 ND_PRINT((ndo, "\n\tAcknowledgment "));
407 if(len < 2) goto invalid;
408 nonce = EXTRACT_16BITS(message + 2);
409 ND_PRINT((ndo, "%04x", nonce));
410 }
411 }
412 break;
413
414 case MESSAGE_HELLO: {
415 u_short seqno, interval;
416 if (!ndo->ndo_vflag)
417 ND_PRINT((ndo, " hello"));
418 else {
419 ND_PRINT((ndo, "\n\tHello "));
420 if(len < 6) goto invalid;
421 seqno = EXTRACT_16BITS(message + 4);
422 interval = EXTRACT_16BITS(message + 6);
423 ND_PRINT((ndo, "seqno %u interval %s", seqno, format_interval(interval)));
424 /* Extra data. */
425 if(len > 6)
426 subtlvs_print(ndo, message + 8, message + 2 + len, type);
427 }
428 }
429 break;
430
431 case MESSAGE_IHU: {
432 unsigned short txcost, interval;
433 if (!ndo->ndo_vflag)
434 ND_PRINT((ndo, " ihu"));
435 else {
436 u_char address[16];
437 int rc;
438 ND_PRINT((ndo, "\n\tIHU "));
439 if(len < 6) goto invalid;
440 txcost = EXTRACT_16BITS(message + 4);
441 interval = EXTRACT_16BITS(message + 6);
442 rc = network_address(message[2], message + 8, len - 6, address);
443 if(rc < 0) { ND_PRINT((ndo, "%s", tstr)); break; }
444 ND_PRINT((ndo, "%s txcost %u interval %s",
445 format_address(ndo, address), txcost, format_interval(interval)));
446 /* Extra data. */
447 if((u_int)rc < len - 6)
448 subtlvs_print(ndo, message + 8 + rc, message + 2 + len,
449 type);
450 }
451 }
452 break;
453
454 case MESSAGE_ROUTER_ID: {
455 if (!ndo->ndo_vflag)
456 ND_PRINT((ndo, " router-id"));
457 else {
458 ND_PRINT((ndo, "\n\tRouter Id"));
459 if(len < 10) goto invalid;
460 ND_PRINT((ndo, " %s", format_id(message + 4)));
461 }
462 }
463 break;
464
465 case MESSAGE_NH: {
466 if (!ndo->ndo_vflag)
467 ND_PRINT((ndo, " nh"));
468 else {
469 int rc;
470 u_char nh[16];
471 ND_PRINT((ndo, "\n\tNext Hop"));
472 if(len < 2) goto invalid;
473 rc = network_address(message[2], message + 4, len - 2, nh);
474 if(rc < 0) goto invalid;
475 ND_PRINT((ndo, " %s", format_address(ndo, nh)));
476 }
477 }
478 break;
479
480 case MESSAGE_UPDATE: {
481 if (!ndo->ndo_vflag) {
482 ND_PRINT((ndo, " update"));
483 if(len < 1)
484 ND_PRINT((ndo, "/truncated"));
485 else
486 ND_PRINT((ndo, "%s%s%s",
487 (message[3] & 0x80) ? "/prefix": "",
488 (message[3] & 0x40) ? "/id" : "",
489 (message[3] & 0x3f) ? "/unknown" : ""));
490 } else {
491 u_short interval, seqno, metric;
492 u_char plen;
493 int rc;
494 u_char prefix[16];
495 ND_PRINT((ndo, "\n\tUpdate"));
496 if(len < 10) goto invalid;
497 plen = message[4] + (message[2] == 1 ? 96 : 0);
498 rc = network_prefix(message[2], message[4], message[5],
499 message + 12,
500 message[2] == 1 ? v4_prefix : v6_prefix,
501 len - 10, prefix);
502 if(rc < 0) goto invalid;
503 interval = EXTRACT_16BITS(message + 6);
504 seqno = EXTRACT_16BITS(message + 8);
505 metric = EXTRACT_16BITS(message + 10);
506 ND_PRINT((ndo, "%s%s%s %s metric %u seqno %u interval %s",
507 (message[3] & 0x80) ? "/prefix": "",
508 (message[3] & 0x40) ? "/id" : "",
509 (message[3] & 0x3f) ? "/unknown" : "",
510 format_prefix(ndo, prefix, plen),
511 metric, seqno, format_interval_update(interval)));
512 if(message[3] & 0x80) {
513 if(message[2] == 1)
514 memcpy(v4_prefix, prefix, 16);
515 else
516 memcpy(v6_prefix, prefix, 16);
517 }
518 /* extra data? */
519 if((u_int)rc < len - 10)
520 subtlvs_print(ndo, message + 12 + rc, message + 2 + len, type);
521 }
522 }
523 break;
524
525 case MESSAGE_REQUEST: {
526 if (!ndo->ndo_vflag)
527 ND_PRINT((ndo, " request"));
528 else {
529 int rc;
530 u_char prefix[16], plen;
531 ND_PRINT((ndo, "\n\tRequest "));
532 if(len < 2) goto invalid;
533 plen = message[3] + (message[2] == 1 ? 96 : 0);
534 rc = network_prefix(message[2], message[3], 0,
535 message + 4, NULL, len - 2, prefix);
536 if(rc < 0) goto invalid;
537 ND_PRINT((ndo, "for %s",
538 message[2] == 0 ? "any" : format_prefix(ndo, prefix, plen)));
539 }
540 }
541 break;
542
543 case MESSAGE_MH_REQUEST : {
544 if (!ndo->ndo_vflag)
545 ND_PRINT((ndo, " mh-request"));
546 else {
547 int rc;
548 u_short seqno;
549 u_char prefix[16], plen;
550 ND_PRINT((ndo, "\n\tMH-Request "));
551 if(len < 14) goto invalid;
552 seqno = EXTRACT_16BITS(message + 4);
553 rc = network_prefix(message[2], message[3], 0,
554 message + 16, NULL, len - 14, prefix);
555 if(rc < 0) goto invalid;
556 plen = message[3] + (message[2] == 1 ? 96 : 0);
557 ND_PRINT((ndo, "(%u hops) for %s seqno %u id %s",
558 message[6], format_prefix(ndo, prefix, plen),
559 seqno, format_id(message + 8)));
560 }
561 }
562 break;
563 case MESSAGE_TSPC :
564 if (!ndo->ndo_vflag)
565 ND_PRINT((ndo, " tspc"));
566 else {
567 ND_PRINT((ndo, "\n\tTS/PC "));
568 if(len < 6) goto invalid;
569 ND_PRINT((ndo, "timestamp %u packetcounter %u", EXTRACT_32BITS (message + 4),
570 EXTRACT_16BITS(message + 2)));
571 }
572 break;
573 case MESSAGE_HMAC : {
574 if (!ndo->ndo_vflag)
575 ND_PRINT((ndo, " hmac"));
576 else {
577 unsigned j;
578 ND_PRINT((ndo, "\n\tHMAC "));
579 if(len < 18) goto invalid;
580 ND_PRINT((ndo, "key-id %u digest-%u ", EXTRACT_16BITS(message + 2), len - 2));
581 for (j = 0; j < len - 2; j++)
582 ND_PRINT((ndo, "%02X", message[4 + j]));
583 }
584 }
585 break;
586
587 case MESSAGE_UPDATE_SRC_SPECIFIC : {
588 if(!ndo->ndo_vflag) {
589 ND_PRINT((ndo, " ss-update"));
590 } else {
591 u_char prefix[16], src_prefix[16];
592 u_short interval, seqno, metric;
593 u_char ae, plen, src_plen, omitted;
594 int rc;
595 int parsed_len = 10;
596 ND_PRINT((ndo, "\n\tSS-Update"));
597 if(len < 10) goto invalid;
598 ae = message[2];
599 src_plen = message[3];
600 plen = message[4];
601 omitted = message[5];
602 interval = EXTRACT_16BITS(message + 6);
603 seqno = EXTRACT_16BITS(message + 8);
604 metric = EXTRACT_16BITS(message + 10);
605 rc = network_prefix(ae, plen, omitted, message + 2 + parsed_len,
606 ae == 1 ? v4_prefix : v6_prefix,
607 len - parsed_len, prefix);
608 if(rc < 0) goto invalid;
609 if(ae == 1)
610 plen += 96;
611 parsed_len += rc;
612 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
613 NULL, len - parsed_len, src_prefix);
614 if(rc < 0) goto invalid;
615 if(ae == 1)
616 src_plen += 96;
617 parsed_len += rc;
618
619 ND_PRINT((ndo, " %s from", format_prefix(ndo, prefix, plen)));
620 ND_PRINT((ndo, " %s metric %u seqno %u interval %s",
621 format_prefix(ndo, src_prefix, src_plen),
622 metric, seqno, format_interval_update(interval)));
623 /* extra data? */
624 if((u_int)parsed_len < len)
625 subtlvs_print(ndo, message + 2 + parsed_len,
626 message + 2 + len, type);
627 }
628 }
629 break;
630
631 case MESSAGE_REQUEST_SRC_SPECIFIC : {
632 if(!ndo->ndo_vflag)
633 ND_PRINT((ndo, " ss-request"));
634 else {
635 int rc, parsed_len = 3;
636 u_char ae, plen, src_plen, prefix[16], src_prefix[16];
637 ND_PRINT((ndo, "\n\tSS-Request "));
638 if(len < 3) goto invalid;
639 ae = message[2];
640 plen = message[3];
641 src_plen = message[4];
642 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
643 NULL, len - parsed_len, prefix);
644 if(rc < 0) goto invalid;
645 if(ae == 1)
646 plen += 96;
647 parsed_len += rc;
648 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
649 NULL, len - parsed_len, src_prefix);
650 if(rc < 0) goto invalid;
651 if(ae == 1)
652 src_plen += 96;
653 parsed_len += rc;
654 if(ae == 0) {
655 ND_PRINT((ndo, "for any"));
656 } else {
657 ND_PRINT((ndo, "for (%s, ", format_prefix(ndo, prefix, plen)));
658 ND_PRINT((ndo, "%s)", format_prefix(ndo, src_prefix, src_plen)));
659 }
660 }
661 }
662 break;
663
664 case MESSAGE_MH_REQUEST_SRC_SPECIFIC : {
665 if(!ndo->ndo_vflag)
666 ND_PRINT((ndo, " ss-mh-request"));
667 else {
668 int rc, parsed_len = 14;
669 u_short seqno;
670 u_char ae, plen, src_plen, prefix[16], src_prefix[16], hopc;
671 const u_char *router_id = NULL;
672 ND_PRINT((ndo, "\n\tSS-MH-Request "));
673 if(len < 14) goto invalid;
674 ae = message[2];
675 plen = message[3];
676 seqno = EXTRACT_16BITS(message + 4);
677 hopc = message[6];
678 src_plen = message[7];
679 router_id = message + 8;
680 rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
681 NULL, len - parsed_len, prefix);
682 if(rc < 0) goto invalid;
683 if(ae == 1)
684 plen += 96;
685 parsed_len += rc;
686 rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
687 NULL, len - parsed_len, src_prefix);
688 if(rc < 0) goto invalid;
689 if(ae == 1)
690 src_plen += 96;
691 ND_PRINT((ndo, "(%u hops) for (%s, ",
692 hopc, format_prefix(ndo, prefix, plen)));
693 ND_PRINT((ndo, "%s) seqno %u id %s",
694 format_prefix(ndo, src_prefix, src_plen),
695 seqno, format_id(router_id)));
696 }
697 }
698 break;
699
700 default:
701 if (!ndo->ndo_vflag)
702 ND_PRINT((ndo, " unknown"));
703 else
704 ND_PRINT((ndo, "\n\tUnknown message type %d", type));
705 }
706 i += len + 2;
707 }
708 return;
709
710 trunc:
711 ND_PRINT((ndo, " %s", tstr));
712 return;
713
714 invalid:
715 ND_PRINT((ndo, "%s", istr));
716 return;
717 }
718