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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 #ifdef HAVE_CONFIG_H
13 #include "config.h"
14 #endif
15 
16 #include <netdissect-stdinc.h>
17 
18 #include <stdio.h>
19 #include <string.h>
20 
21 #include "netdissect.h"
22 #include "addrtoname.h"
23 #include "extract.h"
24 #include "ip.h"
25 #include "ip6.h"
26 #include "ipproto.h"
27 
28 /* RFC4340: Datagram Congestion Control Protocol (DCCP) */
29 
30 /**
31  * struct dccp_hdr - generic part of DCCP packet header, with a 24-bit
32  * sequence number
33  *
34  * @dccph_sport - Relevant port on the endpoint that sent this packet
35  * @dccph_dport - Relevant port on the other endpoint
36  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
37  * @dccph_ccval - Used by the HC-Sender CCID
38  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
39  * @dccph_checksum - Internet checksum, depends on dccph_cscov
40  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
41  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
42  * @dccph_seq - 24-bit sequence number
43  */
44 struct dccp_hdr {
45 	uint16_t	dccph_sport,
46 			dccph_dport;
47 	uint8_t		dccph_doff;
48 	uint8_t		dccph_ccval_cscov;
49 	uint16_t	dccph_checksum;
50 	uint8_t		dccph_xtr;
51 	uint8_t		dccph_seq[3];
52 } UNALIGNED;
53 
54 /**
55  * struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit
56  * sequence number
57  *
58  * @dccph_sport - Relevant port on the endpoint that sent this packet
59  * @dccph_dport - Relevant port on the other endpoint
60  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
61  * @dccph_ccval - Used by the HC-Sender CCID
62  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
63  * @dccph_checksum - Internet checksum, depends on dccph_cscov
64  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
65  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
66  * @dccph_seq - 48-bit sequence number
67  */
68 struct dccp_hdr_ext {
69 	uint16_t	dccph_sport,
70 			dccph_dport;
71 	uint8_t		dccph_doff;
72 	uint8_t		dccph_ccval_cscov;
73 	uint16_t	dccph_checksum;
74 	uint8_t		dccph_xtr;
75 	uint8_t		reserved;
76 	uint8_t		dccph_seq[6];
77 } UNALIGNED;
78 
79 #define DCCPH_CCVAL(dh)	(((dh)->dccph_ccval_cscov >> 4) & 0xF)
80 #define DCCPH_CSCOV(dh)	(((dh)->dccph_ccval_cscov) & 0xF)
81 
82 #define DCCPH_X(dh)	((dh)->dccph_xtr & 1)
83 #define DCCPH_TYPE(dh)	(((dh)->dccph_xtr >> 1) & 0xF)
84 
85 /**
86  * struct dccp_hdr_request - Conection initiation request header
87  *
88  * @dccph_req_service - Service to which the client app wants to connect
89  */
90 struct dccp_hdr_request {
91 	uint32_t	dccph_req_service;
92 } UNALIGNED;
93 
94 /**
95  * struct dccp_hdr_response - Conection initiation response header
96  *
97  * @dccph_resp_ack - 48 bit ack number, contains GSR
98  * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
99  */
100 struct dccp_hdr_response {
101 	uint8_t				dccph_resp_ack[8];	/* always 8 bytes */
102 	uint32_t			dccph_resp_service;
103 } UNALIGNED;
104 
105 /**
106  * struct dccp_hdr_reset - Unconditionally shut down a connection
107  *
108  * @dccph_resp_ack - 48 bit ack number
109  * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
110  */
111 struct dccp_hdr_reset {
112 	uint8_t				dccph_reset_ack[8];	/* always 8 bytes */
113 	uint8_t				dccph_reset_code,
114 					dccph_reset_data[3];
115 } UNALIGNED;
116 
117 enum dccp_pkt_type {
118 	DCCP_PKT_REQUEST = 0,
119 	DCCP_PKT_RESPONSE,
120 	DCCP_PKT_DATA,
121 	DCCP_PKT_ACK,
122 	DCCP_PKT_DATAACK,
123 	DCCP_PKT_CLOSEREQ,
124 	DCCP_PKT_CLOSE,
125 	DCCP_PKT_RESET,
126 	DCCP_PKT_SYNC,
127 	DCCP_PKT_SYNCACK
128 };
129 
130 static const struct tok dccp_pkt_type_str[] = {
131 	{ DCCP_PKT_REQUEST, "DCCP-Request" },
132 	{ DCCP_PKT_RESPONSE, "DCCP-Response" },
133 	{ DCCP_PKT_DATA, "DCCP-Data" },
134 	{ DCCP_PKT_ACK, "DCCP-Ack" },
135 	{ DCCP_PKT_DATAACK, "DCCP-DataAck" },
136 	{ DCCP_PKT_CLOSEREQ, "DCCP-CloseReq" },
137 	{ DCCP_PKT_CLOSE, "DCCP-Close" },
138 	{ DCCP_PKT_RESET, "DCCP-Reset" },
139 	{ DCCP_PKT_SYNC, "DCCP-Sync" },
140 	{ DCCP_PKT_SYNCACK, "DCCP-SyncAck" },
141 	{ 0, NULL}
142 };
143 
144 enum dccp_reset_codes {
145 	DCCP_RESET_CODE_UNSPECIFIED = 0,
146 	DCCP_RESET_CODE_CLOSED,
147 	DCCP_RESET_CODE_ABORTED,
148 	DCCP_RESET_CODE_NO_CONNECTION,
149 	DCCP_RESET_CODE_PACKET_ERROR,
150 	DCCP_RESET_CODE_OPTION_ERROR,
151 	DCCP_RESET_CODE_MANDATORY_ERROR,
152 	DCCP_RESET_CODE_CONNECTION_REFUSED,
153 	DCCP_RESET_CODE_BAD_SERVICE_CODE,
154 	DCCP_RESET_CODE_TOO_BUSY,
155 	DCCP_RESET_CODE_BAD_INIT_COOKIE,
156 	DCCP_RESET_CODE_AGGRESSION_PENALTY,
157 	__DCCP_RESET_CODE_LAST
158 };
159 
160 static const char tstr[] = "[|dccp]";
161 
162 static const char *dccp_reset_codes[] = {
163 	"unspecified",
164 	"closed",
165 	"aborted",
166 	"no_connection",
167 	"packet_error",
168 	"option_error",
169 	"mandatory_error",
170 	"connection_refused",
171 	"bad_service_code",
172 	"too_busy",
173 	"bad_init_cookie",
174 	"aggression_penalty",
175 };
176 
177 static const char *dccp_feature_nums[] = {
178 	"reserved",
179 	"ccid",
180 	"allow_short_seqno",
181 	"sequence_window",
182 	"ecn_incapable",
183 	"ack_ratio",
184 	"send_ack_vector",
185 	"send_ndp_count",
186 	"minimum checksum coverage",
187 	"check data checksum",
188 };
189 
dccp_csum_coverage(const struct dccp_hdr * dh,u_int len)190 static inline u_int dccp_csum_coverage(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 = (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 int 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(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 int 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(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 
dccp_seqno(const u_char * bp)221 static uint64_t dccp_seqno(const u_char *bp)
222 {
223 	const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
224 	uint64_t seqno;
225 
226 	if (DCCPH_X(dh) != 0) {
227 		const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
228 		seqno = EXTRACT_48BITS(dhx->dccph_seq);
229 	} else {
230 		seqno = EXTRACT_24BITS(dh->dccph_seq);
231 	}
232 
233 	return seqno;
234 }
235 
dccp_basic_hdr_len(const struct dccp_hdr * dh)236 static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
237 {
238 	return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
239 }
240 
dccp_print_ack_no(netdissect_options * ndo,const u_char * bp)241 static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
242 {
243 	const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
244 	const u_char *ackp = bp + dccp_basic_hdr_len(dh);
245 	uint64_t ackno;
246 
247 	if (DCCPH_X(dh) != 0) {
248 		ND_TCHECK2(*ackp, 8);
249 		ackno = EXTRACT_48BITS(ackp + 2);
250 	} else {
251 		ND_TCHECK2(*ackp, 4);
252 		ackno = EXTRACT_24BITS(ackp + 1);
253 	}
254 
255 	ND_PRINT((ndo, "(ack=%" PRIu64 ") ", ackno));
256 trunc:
257 	return;
258 }
259 
260 static int dccp_print_option(netdissect_options *, const u_char *, u_int);
261 
262 /**
263  * dccp_print - show dccp packet
264  * @bp - beginning of dccp packet
265  * @data2 - beginning of enclosing
266  * @len - lenght of ip packet
267  */
dccp_print(netdissect_options * ndo,const u_char * bp,const u_char * data2,u_int len)268 void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
269 		u_int len)
270 {
271 	const struct dccp_hdr *dh;
272 	const struct ip *ip;
273 	const struct ip6_hdr *ip6;
274 	const u_char *cp;
275 	u_short sport, dport;
276 	u_int hlen;
277 	u_int fixed_hdrlen;
278 	uint8_t	dccph_type;
279 
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 		ND_PRINT((ndo, "[Invalid packet|dccp]"));
292 		return;
293 	}
294 	if (len < sizeof(struct dccp_hdr)) {
295 		ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
296 			  len - (u_int)sizeof(struct dccp_hdr)));
297 		return;
298 	}
299 
300 	/* get the length of the generic header */
301 	fixed_hdrlen = dccp_basic_hdr_len(dh);
302 	if (len < fixed_hdrlen) {
303 		ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
304 			  len - fixed_hdrlen));
305 		return;
306 	}
307 	ND_TCHECK2(*dh, fixed_hdrlen);
308 
309 	sport = EXTRACT_16BITS(&dh->dccph_sport);
310 	dport = EXTRACT_16BITS(&dh->dccph_dport);
311 	hlen = dh->dccph_doff * 4;
312 
313 	if (ip6) {
314 		ND_PRINT((ndo, "%s.%d > %s.%d: ",
315 			  ip6addr_string(ndo, &ip6->ip6_src), sport,
316 			  ip6addr_string(ndo, &ip6->ip6_dst), dport));
317 	} else {
318 		ND_PRINT((ndo, "%s.%d > %s.%d: ",
319 			  ipaddr_string(ndo, &ip->ip_src), sport,
320 			  ipaddr_string(ndo, &ip->ip_dst), dport));
321 	}
322 
323 	ND_PRINT((ndo, "DCCP"));
324 
325 	if (ndo->ndo_qflag) {
326 		ND_PRINT((ndo, " %d", len - hlen));
327 		if (hlen > len) {
328 			ND_PRINT((ndo, " [bad hdr length %u - too long, > %u]",
329 				  hlen, len));
330 		}
331 		return;
332 	}
333 
334 	/* other variables in generic header */
335 	if (ndo->ndo_vflag) {
336 		ND_PRINT((ndo, " (CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh)));
337 	}
338 
339 	/* checksum calculation */
340 	if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) {
341 		uint16_t sum = 0, dccp_sum;
342 
343 		dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
344 		ND_PRINT((ndo, "cksum 0x%04x ", dccp_sum));
345 		if (IP_V(ip) == 4)
346 			sum = dccp_cksum(ndo, ip, dh, len);
347 		else if (IP_V(ip) == 6)
348 			sum = dccp6_cksum(ndo, ip6, dh, len);
349 		if (sum != 0)
350 			ND_PRINT((ndo, "(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum)));
351 		else
352 			ND_PRINT((ndo, "(correct)"));
353 	}
354 
355 	if (ndo->ndo_vflag)
356 		ND_PRINT((ndo, ")"));
357 	ND_PRINT((ndo, " "));
358 
359 	dccph_type = DCCPH_TYPE(dh);
360 	switch (dccph_type) {
361 	case DCCP_PKT_REQUEST: {
362 		const struct dccp_hdr_request *dhr =
363 			(const struct dccp_hdr_request *)(bp + fixed_hdrlen);
364 		fixed_hdrlen += 4;
365 		if (len < fixed_hdrlen) {
366 			ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
367 				  tok2str(dccp_pkt_type_str, "", dccph_type),
368 				  len - fixed_hdrlen));
369 			return;
370 		}
371 		ND_TCHECK(*dhr);
372 		ND_PRINT((ndo, "%s (service=%d) ",
373 			  tok2str(dccp_pkt_type_str, "", dccph_type),
374 			  EXTRACT_32BITS(&dhr->dccph_req_service)));
375 		break;
376 	}
377 	case DCCP_PKT_RESPONSE: {
378 		const struct dccp_hdr_response *dhr =
379 			(const struct dccp_hdr_response *)(bp + fixed_hdrlen);
380 		fixed_hdrlen += 12;
381 		if (len < fixed_hdrlen) {
382 			ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
383 				  tok2str(dccp_pkt_type_str, "", dccph_type),
384 				  len - fixed_hdrlen));
385 			return;
386 		}
387 		ND_TCHECK(*dhr);
388 		ND_PRINT((ndo, "%s (service=%d) ",
389 			  tok2str(dccp_pkt_type_str, "", dccph_type),
390 			  EXTRACT_32BITS(&dhr->dccph_resp_service)));
391 		break;
392 	}
393 	case DCCP_PKT_DATA:
394 		ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
395 		break;
396 	case DCCP_PKT_ACK: {
397 		fixed_hdrlen += 8;
398 		if (len < fixed_hdrlen) {
399 			ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
400 				  tok2str(dccp_pkt_type_str, "", dccph_type),
401 				  len - fixed_hdrlen));
402 			return;
403 		}
404 		ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
405 		break;
406 	}
407 	case DCCP_PKT_DATAACK: {
408 		fixed_hdrlen += 8;
409 		if (len < fixed_hdrlen) {
410 			ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
411 				  tok2str(dccp_pkt_type_str, "", dccph_type),
412 				  len - fixed_hdrlen));
413 			return;
414 		}
415 		ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
416 		break;
417 	}
418 	case DCCP_PKT_CLOSEREQ:
419 		fixed_hdrlen += 8;
420 		if (len < fixed_hdrlen) {
421 			ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
422 				  tok2str(dccp_pkt_type_str, "", dccph_type),
423 				  len - fixed_hdrlen));
424 			return;
425 		}
426 		ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
427 		break;
428 	case DCCP_PKT_CLOSE:
429 		fixed_hdrlen += 8;
430 		if (len < fixed_hdrlen) {
431 			ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
432 				  tok2str(dccp_pkt_type_str, "", dccph_type),
433 				  len - fixed_hdrlen));
434 			return;
435 		}
436 		ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
437 		break;
438 	case DCCP_PKT_RESET: {
439 		const struct dccp_hdr_reset *dhr =
440 			(const struct dccp_hdr_reset *)(bp + fixed_hdrlen);
441 		fixed_hdrlen += 12;
442 		if (len < fixed_hdrlen) {
443 			ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
444 				  tok2str(dccp_pkt_type_str, "", dccph_type),
445 				  len - fixed_hdrlen));
446 			return;
447 		}
448 		ND_TCHECK(*dhr);
449 		ND_PRINT((ndo, "%s (code=%s) ",
450 			  tok2str(dccp_pkt_type_str, "", dccph_type),
451 			  dccp_reset_code(dhr->dccph_reset_code)));
452 		break;
453 	}
454 	case DCCP_PKT_SYNC:
455 		fixed_hdrlen += 8;
456 		if (len < fixed_hdrlen) {
457 			ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
458 				  tok2str(dccp_pkt_type_str, "", dccph_type),
459 				  len - fixed_hdrlen));
460 			return;
461 		}
462 		ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
463 		break;
464 	case DCCP_PKT_SYNCACK:
465 		fixed_hdrlen += 8;
466 		if (len < fixed_hdrlen) {
467 			ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
468 				  tok2str(dccp_pkt_type_str, "", dccph_type),
469 				  len - fixed_hdrlen));
470 			return;
471 		}
472 		ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
473 		break;
474 	default:
475 		ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "unknown-type-%u", dccph_type)));
476 		break;
477 	}
478 
479 	if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
480 			(DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
481 		dccp_print_ack_no(ndo, bp);
482 
483 	if (ndo->ndo_vflag < 2)
484 		return;
485 
486 	ND_PRINT((ndo, "seq %" PRIu64, dccp_seqno(bp)));
487 
488 	/* process options */
489 	if (hlen > fixed_hdrlen){
490 		u_int optlen;
491 		cp = bp + fixed_hdrlen;
492 		ND_PRINT((ndo, " <"));
493 
494 		hlen -= fixed_hdrlen;
495 		while(1){
496 			optlen = dccp_print_option(ndo, cp, hlen);
497 			if (!optlen)
498 				break;
499 			if (hlen <= optlen)
500 				break;
501 			hlen -= optlen;
502 			cp += optlen;
503 			ND_PRINT((ndo, ", "));
504 		}
505 		ND_PRINT((ndo, ">"));
506 	}
507 	return;
508 trunc:
509 	ND_PRINT((ndo, "%s", tstr));
510 	return;
511 }
512 
513 static const struct tok dccp_option_values[] = {
514 	{ 0, "nop" },
515 	{ 1, "mandatory" },
516 	{ 2, "slowreceiver" },
517 	{ 32, "change_l" },
518 	{ 33, "confirm_l" },
519 	{ 34, "change_r" },
520 	{ 35, "confirm_r" },
521 	{ 36, "initcookie" },
522 	{ 37, "ndp_count" },
523 	{ 38, "ack_vector0" },
524 	{ 39, "ack_vector1" },
525 	{ 40, "data_dropped" },
526 	{ 41, "timestamp" },
527 	{ 42, "timestamp_echo" },
528 	{ 43, "elapsed_time" },
529 	{ 44, "data_checksum" },
530 	{ 0, NULL }
531 };
532 
dccp_print_option(netdissect_options * ndo,const u_char * option,u_int hlen)533 static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
534 {
535 	uint8_t optlen, i;
536 
537 	ND_TCHECK(*option);
538 
539 	if (*option >= 32) {
540 		ND_TCHECK(*(option+1));
541 		optlen = *(option +1);
542 		if (optlen < 2) {
543 			if (*option >= 128)
544 				ND_PRINT((ndo, "CCID option %u optlen too short", *option));
545 			else
546 				ND_PRINT((ndo, "%s optlen too short",
547 					  tok2str(dccp_option_values, "Option %u", *option)));
548 			return 0;
549 		}
550 	} else
551 		optlen = 1;
552 
553 	if (hlen < optlen) {
554 		if (*option >= 128)
555 			ND_PRINT((ndo, "CCID option %u optlen goes past header length",
556 				  *option));
557 		else
558 			ND_PRINT((ndo, "%s optlen goes past header length",
559 				  tok2str(dccp_option_values, "Option %u", *option)));
560 		return 0;
561 	}
562 	ND_TCHECK2(*option, optlen);
563 
564 	if (*option >= 128) {
565 		ND_PRINT((ndo, "CCID option %d", *option));
566 		switch (optlen) {
567 			case 4:
568 				ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
569 				break;
570 			case 6:
571 				ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
572 				break;
573 			default:
574 				break;
575 		}
576 	} else {
577 		ND_PRINT((ndo, "%s", tok2str(dccp_option_values, "Option %u", *option)));
578 		switch (*option) {
579 		case 32:
580 		case 33:
581 		case 34:
582 		case 35:
583 			if (optlen < 3) {
584 				ND_PRINT((ndo, " optlen too short"));
585 				return optlen;
586 			}
587 			if (*(option + 2) < 10){
588 				ND_PRINT((ndo, " %s", dccp_feature_nums[*(option + 2)]));
589 				for (i = 0; i < optlen - 3; i++)
590 					ND_PRINT((ndo, " %d", *(option + 3 + i)));
591 			}
592 			break;
593 		case 36:
594 			if (optlen > 2) {
595 				ND_PRINT((ndo, " 0x"));
596 				for (i = 0; i < optlen - 2; i++)
597 					ND_PRINT((ndo, "%02x", *(option + 2 + i)));
598 			}
599 			break;
600 		case 37:
601 			for (i = 0; i < optlen - 2; i++)
602 				ND_PRINT((ndo, " %d", *(option + 2 + i)));
603 			break;
604 		case 38:
605 			if (optlen > 2) {
606 				ND_PRINT((ndo, " 0x"));
607 				for (i = 0; i < optlen - 2; i++)
608 					ND_PRINT((ndo, "%02x", *(option + 2 + i)));
609 			}
610 			break;
611 		case 39:
612 			if (optlen > 2) {
613 				ND_PRINT((ndo, " 0x"));
614 				for (i = 0; i < optlen - 2; i++)
615 					ND_PRINT((ndo, "%02x", *(option + 2 + i)));
616 			}
617 			break;
618 		case 40:
619 			if (optlen > 2) {
620 				ND_PRINT((ndo, " 0x"));
621 				for (i = 0; i < optlen - 2; i++)
622 					ND_PRINT((ndo, "%02x", *(option + 2 + i)));
623 			}
624 			break;
625 		case 41:
626 			if (optlen == 4)
627 				ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
628 			else
629 				ND_PRINT((ndo, " optlen != 4"));
630 			break;
631 		case 42:
632 			if (optlen == 4)
633 				ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
634 			else
635 				ND_PRINT((ndo, " optlen != 4"));
636 			break;
637 		case 43:
638 			if (optlen == 6)
639 				ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
640 			else if (optlen == 4)
641 				ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
642 			else
643 				ND_PRINT((ndo, " optlen != 4 or 6"));
644 			break;
645 		case 44:
646 			if (optlen > 2) {
647 				ND_PRINT((ndo, " "));
648 				for (i = 0; i < optlen - 2; i++)
649 					ND_PRINT((ndo, "%02x", *(option + 2 + i)));
650 			}
651 			break;
652 		}
653 	}
654 
655 	return optlen;
656 trunc:
657 	ND_PRINT((ndo, "%s", tstr));
658 	return 0;
659 }
660