1 /*
2 * Copyright (C) Arnaldo Carvalho de Melo 2004
3 * Copyright (C) Ian McDonald 2005
4 * Copyright (C) Yoshifumi Nishida 2005
5 *
6 * This software may be distributed either under the terms of the
7 * BSD-style license that accompanies tcpdump or the GNU GPL version 2
8 */
9
10 /* \summary: Datagram Congestion Control Protocol (DCCP) printer */
11
12 /* specification: RFC 4340 */
13
14 #include <config.h>
15
16 #include "netdissect-stdinc.h"
17
18 #include "netdissect.h"
19 #include "addrtoname.h"
20 #include "extract.h"
21 #include "ip.h"
22 #include "ip6.h"
23 #include "ipproto.h"
24
25 /* RFC4340: Datagram Congestion Control Protocol (DCCP) */
26
27 /**
28 * struct dccp_hdr - generic part of DCCP packet header, with a 24-bit
29 * sequence number
30 *
31 * @dccph_sport - Relevant port on the endpoint that sent this packet
32 * @dccph_dport - Relevant port on the other endpoint
33 * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
34 * @dccph_ccval - Used by the HC-Sender CCID
35 * @dccph_cscov - Parts of the packet that are covered by the Checksum field
36 * @dccph_checksum - Internet checksum, depends on dccph_cscov
37 * @dccph_x - 0 = 24 bit sequence number, 1 = 48
38 * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
39 * @dccph_seq - 24-bit sequence number
40 */
41 struct dccp_hdr {
42 nd_uint16_t dccph_sport,
43 dccph_dport;
44 nd_uint8_t dccph_doff;
45 nd_uint8_t dccph_ccval_cscov;
46 nd_uint16_t dccph_checksum;
47 nd_uint8_t dccph_xtr;
48 nd_uint24_t dccph_seq;
49 };
50
51 /**
52 * struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit
53 * sequence number
54 *
55 * @dccph_sport - Relevant port on the endpoint that sent this packet
56 * @dccph_dport - Relevant port on the other endpoint
57 * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
58 * @dccph_ccval - Used by the HC-Sender CCID
59 * @dccph_cscov - Parts of the packet that are covered by the Checksum field
60 * @dccph_checksum - Internet checksum, depends on dccph_cscov
61 * @dccph_x - 0 = 24 bit sequence number, 1 = 48
62 * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
63 * @dccph_seq - 48-bit sequence number
64 */
65 struct dccp_hdr_ext {
66 nd_uint16_t dccph_sport,
67 dccph_dport;
68 nd_uint8_t dccph_doff;
69 nd_uint8_t dccph_ccval_cscov;
70 nd_uint16_t dccph_checksum;
71 nd_uint8_t dccph_xtr;
72 nd_uint8_t reserved;
73 nd_uint48_t dccph_seq;
74 };
75
76 #define DCCPH_CCVAL(dh) ((GET_U_1((dh)->dccph_ccval_cscov) >> 4) & 0xF)
77 #define DCCPH_CSCOV(dh) (GET_U_1((dh)->dccph_ccval_cscov) & 0xF)
78
79 #define DCCPH_X(dh) (GET_U_1((dh)->dccph_xtr) & 1)
80 #define DCCPH_TYPE(dh) ((GET_U_1((dh)->dccph_xtr) >> 1) & 0xF)
81
82 /**
83 * struct dccp_hdr_request - Connection initiation request header
84 *
85 * @dccph_req_service - Service to which the client app wants to connect
86 */
87 struct dccp_hdr_request {
88 nd_uint32_t dccph_req_service;
89 };
90
91 /**
92 * struct dccp_hdr_response - Connection initiation response header
93 *
94 * @dccph_resp_ack - 48 bit ack number, contains GSR
95 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
96 */
97 struct dccp_hdr_response {
98 nd_uint64_t dccph_resp_ack; /* always 8 bytes, first 2 reserved */
99 nd_uint32_t dccph_resp_service;
100 };
101
102 /**
103 * struct dccp_hdr_reset - Unconditionally shut down a connection
104 *
105 * @dccph_resp_ack - 48 bit ack number
106 * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
107 */
108 struct dccp_hdr_reset {
109 nd_uint64_t dccph_reset_ack; /* always 8 bytes, first 2 reserved */
110 nd_uint8_t dccph_reset_code;
111 nd_uint8_t dccph_reset_data1;
112 nd_uint8_t dccph_reset_data2;
113 nd_uint8_t dccph_reset_data3;
114 };
115
116 enum dccp_pkt_type {
117 DCCP_PKT_REQUEST = 0,
118 DCCP_PKT_RESPONSE,
119 DCCP_PKT_DATA,
120 DCCP_PKT_ACK,
121 DCCP_PKT_DATAACK,
122 DCCP_PKT_CLOSEREQ,
123 DCCP_PKT_CLOSE,
124 DCCP_PKT_RESET,
125 DCCP_PKT_SYNC,
126 DCCP_PKT_SYNCACK
127 };
128
129 static const struct tok dccp_pkt_type_str[] = {
130 { DCCP_PKT_REQUEST, "DCCP-Request" },
131 { DCCP_PKT_RESPONSE, "DCCP-Response" },
132 { DCCP_PKT_DATA, "DCCP-Data" },
133 { DCCP_PKT_ACK, "DCCP-Ack" },
134 { DCCP_PKT_DATAACK, "DCCP-DataAck" },
135 { DCCP_PKT_CLOSEREQ, "DCCP-CloseReq" },
136 { DCCP_PKT_CLOSE, "DCCP-Close" },
137 { DCCP_PKT_RESET, "DCCP-Reset" },
138 { DCCP_PKT_SYNC, "DCCP-Sync" },
139 { DCCP_PKT_SYNCACK, "DCCP-SyncAck" },
140 { 0, NULL}
141 };
142
143 enum dccp_reset_codes {
144 DCCP_RESET_CODE_UNSPECIFIED = 0,
145 DCCP_RESET_CODE_CLOSED,
146 DCCP_RESET_CODE_ABORTED,
147 DCCP_RESET_CODE_NO_CONNECTION,
148 DCCP_RESET_CODE_PACKET_ERROR,
149 DCCP_RESET_CODE_OPTION_ERROR,
150 DCCP_RESET_CODE_MANDATORY_ERROR,
151 DCCP_RESET_CODE_CONNECTION_REFUSED,
152 DCCP_RESET_CODE_BAD_SERVICE_CODE,
153 DCCP_RESET_CODE_TOO_BUSY,
154 DCCP_RESET_CODE_BAD_INIT_COOKIE,
155 DCCP_RESET_CODE_AGGRESSION_PENALTY,
156 __DCCP_RESET_CODE_LAST
157 };
158
159
160 static const char *dccp_reset_codes[] = {
161 "unspecified",
162 "closed",
163 "aborted",
164 "no_connection",
165 "packet_error",
166 "option_error",
167 "mandatory_error",
168 "connection_refused",
169 "bad_service_code",
170 "too_busy",
171 "bad_init_cookie",
172 "aggression_penalty",
173 };
174
175 static const char *dccp_feature_nums[] = {
176 "reserved",
177 "ccid",
178 "allow_short_seqno",
179 "sequence_window",
180 "ecn_incapable",
181 "ack_ratio",
182 "send_ack_vector",
183 "send_ndp_count",
184 "minimum checksum coverage",
185 "check data checksum",
186 };
187
188 static u_int
dccp_csum_coverage(netdissect_options * ndo,const struct dccp_hdr * dh,u_int len)189 dccp_csum_coverage(netdissect_options *ndo,
190 const struct dccp_hdr *dh, u_int len)
191 {
192 u_int cov;
193
194 if (DCCPH_CSCOV(dh) == 0)
195 return len;
196 cov = (GET_U_1(dh->dccph_doff) + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
197 return (cov > len)? len : cov;
198 }
199
dccp_cksum(netdissect_options * ndo,const struct ip * ip,const struct dccp_hdr * dh,u_int len)200 static uint16_t dccp_cksum(netdissect_options *ndo, const struct ip *ip,
201 const struct dccp_hdr *dh, u_int len)
202 {
203 return nextproto4_cksum(ndo, ip, (const uint8_t *)(const void *)dh, len,
204 dccp_csum_coverage(ndo, dh, len), IPPROTO_DCCP);
205 }
206
dccp6_cksum(netdissect_options * ndo,const struct ip6_hdr * ip6,const struct dccp_hdr * dh,u_int len)207 static uint16_t dccp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
208 const struct dccp_hdr *dh, u_int len)
209 {
210 return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)dh, len,
211 dccp_csum_coverage(ndo, dh, len), IPPROTO_DCCP);
212 }
213
dccp_reset_code(uint8_t code)214 static const char *dccp_reset_code(uint8_t code)
215 {
216 if (code >= __DCCP_RESET_CODE_LAST)
217 return "invalid";
218 return dccp_reset_codes[code];
219 }
220
221 static uint64_t
dccp_seqno(netdissect_options * ndo,const u_char * bp)222 dccp_seqno(netdissect_options *ndo, const u_char *bp)
223 {
224 const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
225 uint64_t seqno;
226
227 if (DCCPH_X(dh) != 0) {
228 const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
229 seqno = GET_BE_U_6(dhx->dccph_seq);
230 } else {
231 seqno = GET_BE_U_3(dh->dccph_seq);
232 }
233
234 return seqno;
235 }
236
237 static unsigned int
dccp_basic_hdr_len(netdissect_options * ndo,const struct dccp_hdr * dh)238 dccp_basic_hdr_len(netdissect_options *ndo, const struct dccp_hdr *dh)
239 {
240 return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
241 }
242
dccp_print_ack_no(netdissect_options * ndo,const u_char * bp)243 static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
244 {
245 const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
246 const u_char *ackp = bp + dccp_basic_hdr_len(ndo, dh);
247 uint64_t ackno;
248
249 if (DCCPH_X(dh) != 0) {
250 ackno = GET_BE_U_6(ackp + 2);
251 } else {
252 ackno = GET_BE_U_3(ackp + 1);
253 }
254
255 ND_PRINT("(ack=%" PRIu64 ") ", ackno);
256 }
257
258 static u_int dccp_print_option(netdissect_options *, const u_char *, u_int);
259
260 /**
261 * dccp_print - show dccp packet
262 * @bp - beginning of dccp packet
263 * @data2 - beginning of enclosing
264 * @len - length of ip packet
265 */
266 void
dccp_print(netdissect_options * ndo,const u_char * bp,const u_char * data2,u_int len)267 dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
268 u_int len)
269 {
270 const struct dccp_hdr *dh;
271 const struct ip *ip;
272 const struct ip6_hdr *ip6;
273 const u_char *cp;
274 u_short sport, dport;
275 u_int hlen;
276 u_int fixed_hdrlen;
277 uint8_t dccph_type;
278
279 ndo->ndo_protocol = "dccp";
280 dh = (const struct dccp_hdr *)bp;
281
282 ip = (const struct ip *)data2;
283 if (IP_V(ip) == 6)
284 ip6 = (const struct ip6_hdr *)data2;
285 else
286 ip6 = NULL;
287
288 /* make sure we have enough data to look at the X bit */
289 cp = (const u_char *)(dh + 1);
290 if (cp > ndo->ndo_snapend)
291 goto trunc;
292 if (len < sizeof(struct dccp_hdr)) {
293 ND_PRINT("truncated-dccp - %zu bytes missing!",
294 sizeof(struct dccp_hdr) - len);
295 return;
296 }
297
298 /* get the length of the generic header */
299 fixed_hdrlen = dccp_basic_hdr_len(ndo, dh);
300 if (len < fixed_hdrlen) {
301 ND_PRINT("truncated-dccp - %u bytes missing!",
302 fixed_hdrlen - len);
303 return;
304 }
305 ND_TCHECK_LEN(dh, fixed_hdrlen);
306
307 sport = GET_BE_U_2(dh->dccph_sport);
308 dport = GET_BE_U_2(dh->dccph_dport);
309 hlen = GET_U_1(dh->dccph_doff) * 4;
310
311 if (ip6) {
312 ND_PRINT("%s.%u > %s.%u: ",
313 GET_IP6ADDR_STRING(ip6->ip6_src), sport,
314 GET_IP6ADDR_STRING(ip6->ip6_dst), dport);
315 } else {
316 ND_PRINT("%s.%u > %s.%u: ",
317 GET_IPADDR_STRING(ip->ip_src), sport,
318 GET_IPADDR_STRING(ip->ip_dst), dport);
319 }
320
321 nd_print_protocol_caps(ndo);
322
323 if (ndo->ndo_qflag) {
324 ND_PRINT(" %u", len - hlen);
325 if (hlen > len) {
326 ND_PRINT(" [bad hdr length %u - too long, > %u]",
327 hlen, len);
328 }
329 return;
330 }
331
332 /* other variables in generic header */
333 if (ndo->ndo_vflag) {
334 ND_PRINT(" (CCVal %u, CsCov %u", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh));
335 }
336
337 /* checksum calculation */
338 if (ndo->ndo_vflag && ND_TTEST_LEN(bp, len)) {
339 uint16_t sum = 0, dccp_sum;
340
341 dccp_sum = GET_BE_U_2(dh->dccph_checksum);
342 ND_PRINT(", cksum 0x%04x ", dccp_sum);
343 if (IP_V(ip) == 4)
344 sum = dccp_cksum(ndo, ip, dh, len);
345 else if (IP_V(ip) == 6)
346 sum = dccp6_cksum(ndo, ip6, dh, len);
347 if (sum != 0)
348 ND_PRINT("(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum));
349 else
350 ND_PRINT("(correct)");
351 }
352
353 if (ndo->ndo_vflag)
354 ND_PRINT(")");
355 ND_PRINT(" ");
356
357 dccph_type = DCCPH_TYPE(dh);
358 switch (dccph_type) {
359 case DCCP_PKT_REQUEST: {
360 const struct dccp_hdr_request *dhr =
361 (const struct dccp_hdr_request *)(bp + fixed_hdrlen);
362 fixed_hdrlen += 4;
363 if (len < fixed_hdrlen) {
364 ND_PRINT("truncated-%s - %u bytes missing!",
365 tok2str(dccp_pkt_type_str, "", dccph_type),
366 fixed_hdrlen - len);
367 return;
368 }
369 ND_TCHECK_SIZE(dhr);
370 ND_PRINT("%s (service=%u) ",
371 tok2str(dccp_pkt_type_str, "", dccph_type),
372 GET_BE_U_4(dhr->dccph_req_service));
373 break;
374 }
375 case DCCP_PKT_RESPONSE: {
376 const struct dccp_hdr_response *dhr =
377 (const struct dccp_hdr_response *)(bp + fixed_hdrlen);
378 fixed_hdrlen += 12;
379 if (len < fixed_hdrlen) {
380 ND_PRINT("truncated-%s - %u bytes missing!",
381 tok2str(dccp_pkt_type_str, "", dccph_type),
382 fixed_hdrlen - len);
383 return;
384 }
385 ND_TCHECK_SIZE(dhr);
386 ND_PRINT("%s (service=%u) ",
387 tok2str(dccp_pkt_type_str, "", dccph_type),
388 GET_BE_U_4(dhr->dccph_resp_service));
389 break;
390 }
391 case DCCP_PKT_DATA:
392 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
393 break;
394 case DCCP_PKT_ACK: {
395 fixed_hdrlen += 8;
396 if (len < fixed_hdrlen) {
397 ND_PRINT("truncated-%s - %u bytes missing!",
398 tok2str(dccp_pkt_type_str, "", dccph_type),
399 fixed_hdrlen - len);
400 return;
401 }
402 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
403 break;
404 }
405 case DCCP_PKT_DATAACK: {
406 fixed_hdrlen += 8;
407 if (len < fixed_hdrlen) {
408 ND_PRINT("truncated-%s - %u bytes missing!",
409 tok2str(dccp_pkt_type_str, "", dccph_type),
410 fixed_hdrlen - len);
411 return;
412 }
413 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
414 break;
415 }
416 case DCCP_PKT_CLOSEREQ:
417 fixed_hdrlen += 8;
418 if (len < fixed_hdrlen) {
419 ND_PRINT("truncated-%s - %u bytes missing!",
420 tok2str(dccp_pkt_type_str, "", dccph_type),
421 fixed_hdrlen - len);
422 return;
423 }
424 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
425 break;
426 case DCCP_PKT_CLOSE:
427 fixed_hdrlen += 8;
428 if (len < fixed_hdrlen) {
429 ND_PRINT("truncated-%s - %u bytes missing!",
430 tok2str(dccp_pkt_type_str, "", dccph_type),
431 fixed_hdrlen - len);
432 return;
433 }
434 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
435 break;
436 case DCCP_PKT_RESET: {
437 const struct dccp_hdr_reset *dhr =
438 (const struct dccp_hdr_reset *)(bp + fixed_hdrlen);
439 fixed_hdrlen += 12;
440 if (len < fixed_hdrlen) {
441 ND_PRINT("truncated-%s - %u bytes missing!",
442 tok2str(dccp_pkt_type_str, "", dccph_type),
443 fixed_hdrlen - len);
444 return;
445 }
446 ND_TCHECK_SIZE(dhr);
447 ND_PRINT("%s (code=%s) ",
448 tok2str(dccp_pkt_type_str, "", dccph_type),
449 dccp_reset_code(GET_U_1(dhr->dccph_reset_code)));
450 break;
451 }
452 case DCCP_PKT_SYNC:
453 fixed_hdrlen += 8;
454 if (len < fixed_hdrlen) {
455 ND_PRINT("truncated-%s - %u bytes missing!",
456 tok2str(dccp_pkt_type_str, "", dccph_type),
457 fixed_hdrlen - len);
458 return;
459 }
460 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
461 break;
462 case DCCP_PKT_SYNCACK:
463 fixed_hdrlen += 8;
464 if (len < fixed_hdrlen) {
465 ND_PRINT("truncated-%s - %u bytes missing!",
466 tok2str(dccp_pkt_type_str, "", dccph_type),
467 fixed_hdrlen - len);
468 return;
469 }
470 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
471 break;
472 default:
473 ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "unknown-type-%u", dccph_type));
474 break;
475 }
476
477 if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
478 (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
479 dccp_print_ack_no(ndo, bp);
480
481 if (ndo->ndo_vflag < 2)
482 return;
483
484 ND_PRINT("seq %" PRIu64, dccp_seqno(ndo, bp));
485
486 /* process options */
487 if (hlen > fixed_hdrlen){
488 u_int optlen;
489 cp = bp + fixed_hdrlen;
490 ND_PRINT(" <");
491
492 hlen -= fixed_hdrlen;
493 while(1){
494 optlen = dccp_print_option(ndo, cp, hlen);
495 if (!optlen)
496 break;
497 if (hlen <= optlen)
498 break;
499 hlen -= optlen;
500 cp += optlen;
501 ND_PRINT(", ");
502 }
503 ND_PRINT(">");
504 }
505 return;
506 trunc:
507 nd_print_trunc(ndo);
508 }
509
510 static const struct tok dccp_option_values[] = {
511 { 0, "nop" },
512 { 1, "mandatory" },
513 { 2, "slowreceiver" },
514 { 32, "change_l" },
515 { 33, "confirm_l" },
516 { 34, "change_r" },
517 { 35, "confirm_r" },
518 { 36, "initcookie" },
519 { 37, "ndp_count" },
520 { 38, "ack_vector0" },
521 { 39, "ack_vector1" },
522 { 40, "data_dropped" },
523 { 41, "timestamp" },
524 { 42, "timestamp_echo" },
525 { 43, "elapsed_time" },
526 { 44, "data_checksum" },
527 { 0, NULL }
528 };
529
530 static u_int
dccp_print_option(netdissect_options * ndo,const u_char * option,u_int hlen)531 dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
532 {
533 uint8_t optlen, i;
534
535 if (GET_U_1(option) >= 32) {
536 optlen = GET_U_1(option + 1);
537 if (optlen < 2) {
538 if (GET_U_1(option) >= 128)
539 ND_PRINT("CCID option %u optlen too short",
540 GET_U_1(option));
541 else
542 ND_PRINT("%s optlen too short",
543 tok2str(dccp_option_values, "Option %u", GET_U_1(option)));
544 return 0;
545 }
546 } else
547 optlen = 1;
548
549 if (hlen < optlen) {
550 if (GET_U_1(option) >= 128)
551 ND_PRINT("CCID option %u optlen goes past header length",
552 GET_U_1(option));
553 else
554 ND_PRINT("%s optlen goes past header length",
555 tok2str(dccp_option_values, "Option %u", GET_U_1(option)));
556 return 0;
557 }
558 ND_TCHECK_LEN(option, optlen);
559
560 if (GET_U_1(option) >= 128) {
561 ND_PRINT("CCID option %u", GET_U_1(option));
562 switch (optlen) {
563 case 4:
564 ND_PRINT(" %u", GET_BE_U_2(option + 2));
565 break;
566 case 6:
567 ND_PRINT(" %u", GET_BE_U_4(option + 2));
568 break;
569 default:
570 break;
571 }
572 } else {
573 ND_PRINT("%s",
574 tok2str(dccp_option_values, "Option %u", GET_U_1(option)));
575 switch (GET_U_1(option)) {
576 case 32:
577 case 33:
578 case 34:
579 case 35:
580 if (optlen < 3) {
581 ND_PRINT(" optlen too short");
582 return optlen;
583 }
584 if (GET_U_1(option + 2) < 10){
585 ND_PRINT(" %s",
586 dccp_feature_nums[GET_U_1(option + 2)]);
587 for (i = 0; i < optlen - 3; i++)
588 ND_PRINT(" %u",
589 GET_U_1(option + 3 + i));
590 }
591 break;
592 case 36:
593 if (optlen > 2) {
594 ND_PRINT(" 0x");
595 for (i = 0; i < optlen - 2; i++)
596 ND_PRINT("%02x",
597 GET_U_1(option + 2 + i));
598 }
599 break;
600 case 37:
601 for (i = 0; i < optlen - 2; i++)
602 ND_PRINT(" %u", GET_U_1(option + 2 + i));
603 break;
604 case 38:
605 if (optlen > 2) {
606 ND_PRINT(" 0x");
607 for (i = 0; i < optlen - 2; i++)
608 ND_PRINT("%02x",
609 GET_U_1(option + 2 + i));
610 }
611 break;
612 case 39:
613 if (optlen > 2) {
614 ND_PRINT(" 0x");
615 for (i = 0; i < optlen - 2; i++)
616 ND_PRINT("%02x",
617 GET_U_1(option + 2 + i));
618 }
619 break;
620 case 40:
621 if (optlen > 2) {
622 ND_PRINT(" 0x");
623 for (i = 0; i < optlen - 2; i++)
624 ND_PRINT("%02x",
625 GET_U_1(option + 2 + i));
626 }
627 break;
628 case 41:
629 /*
630 * 13.1. Timestamp Option
631 *
632 * +--------+--------+--------+--------+--------+--------+
633 * |00101001|00000110| Timestamp Value |
634 * +--------+--------+--------+--------+--------+--------+
635 * Type=41 Length=6
636 */
637 if (optlen == 6)
638 ND_PRINT(" %u", GET_BE_U_4(option + 2));
639 else
640 ND_PRINT(" [optlen != 6]");
641 break;
642 case 42:
643 /*
644 * 13.3. Timestamp Echo Option
645 *
646 * +--------+--------+--------+--------+--------+--------+
647 * |00101010|00000110| Timestamp Echo |
648 * +--------+--------+--------+--------+--------+--------+
649 * Type=42 Len=6
650 *
651 * +--------+--------+------- ... -------+--------+--------+
652 * |00101010|00001000| Timestamp Echo | Elapsed Time |
653 * +--------+--------+------- ... -------+--------+--------+
654 * Type=42 Len=8 (4 bytes)
655 *
656 * +--------+--------+------- ... -------+------- ... -------+
657 * |00101010|00001010| Timestamp Echo | Elapsed Time |
658 * +--------+--------+------- ... -------+------- ... -------+
659 * Type=42 Len=10 (4 bytes) (4 bytes)
660 */
661 switch (optlen) {
662 case 6:
663 ND_PRINT(" %u", GET_BE_U_4(option + 2));
664 break;
665 case 8:
666 ND_PRINT(" %u", GET_BE_U_4(option + 2));
667 ND_PRINT(" (elapsed time %u)",
668 GET_BE_U_2(option + 6));
669 break;
670 case 10:
671 ND_PRINT(" %u", GET_BE_U_4(option + 2));
672 ND_PRINT(" (elapsed time %u)",
673 GET_BE_U_4(option + 6));
674 break;
675 default:
676 ND_PRINT(" [optlen != 6 or 8 or 10]");
677 break;
678 }
679 break;
680 case 43:
681 if (optlen == 6)
682 ND_PRINT(" %u", GET_BE_U_4(option + 2));
683 else if (optlen == 4)
684 ND_PRINT(" %u", GET_BE_U_2(option + 2));
685 else
686 ND_PRINT(" [optlen != 4 or 6]");
687 break;
688 case 44:
689 if (optlen > 2) {
690 ND_PRINT(" ");
691 for (i = 0; i < optlen - 2; i++)
692 ND_PRINT("%02x",
693 GET_U_1(option + 2 + i));
694 }
695 break;
696 }
697 }
698
699 return optlen;
700 trunc:
701 nd_print_trunc(ndo);
702 return 0;
703 }
704