2 * Copyright (C) Arnaldo Carvalho de Melo 2004
3 * Copyright (C) Ian McDonald 2005
4 * Copyright (C) Yoshifumi Nishida 2005
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
11 static const char rcsid
[] _U_
=
12 "@(#) $Header: /tcpdump/master/tcpdump/print-dccp.c,v 1.1.2.6 2006/02/19 05:08:44 guy Exp $ (LBL)";
19 #include <tcpdump-stdinc.h>
26 #include "interface.h"
27 #include "addrtoname.h"
28 #include "extract.h" /* must come after interface.h */
35 static const char *dccp_reset_codes
[] = {
50 static const char *dccp_feature_nums
[] = {
59 "minimum checksum coverage",
60 "check data checksum",
63 static int dccp_cksum(const struct ip
*ip
,
64 const struct dccp_hdr
*dh
, u_int len
)
80 phu
.ph
.len
= htons(len
);
81 phu
.ph
.proto
= IPPROTO_DCCP
;
82 memcpy(&phu
.ph
.src
, &ip
->ip_src
.s_addr
, sizeof(u_int32_t
));
84 memcpy(&phu
.ph
.dst
, &ip
->ip_dst
.s_addr
, sizeof(u_int32_t
));
86 phu
.ph
.dst
= ip_finddst(ip
);
89 return in_cksum((u_short
*)dh
, len
, sp
[0]+sp
[1]+sp
[2]+sp
[3]+sp
[4]+sp
[5]);
93 static int dccp6_cksum(const struct ip6_hdr
*ip6
, const struct dccp_hdr
*dh
, u_int len
)
100 struct in6_addr ph_src
;
101 struct in6_addr ph_dst
;
110 memset(&phu
, 0, sizeof(phu
));
111 phu
.ph
.ph_src
= ip6
->ip6_src
;
112 phu
.ph
.ph_dst
= ip6
->ip6_dst
;
113 phu
.ph
.ph_len
= htonl(len
);
114 phu
.ph
.ph_nxt
= IPPROTO_DCCP
;
117 for (i
= 0; i
< sizeof(phu
.pa
) / sizeof(phu
.pa
[0]); i
++)
120 sp
= (const u_int16_t
*)dh
;
122 for (i
= 0; i
< (len
& ~1); i
+= 2)
126 sum
+= htons((*(const u_int8_t
*)sp
) << 8);
129 sum
= (sum
& 0xffff) + (sum
>> 16);
136 static const char *dccp_reset_code(u_int8_t code
)
138 if (code
>= __DCCP_RESET_CODE_LAST
)
140 return dccp_reset_codes
[code
];
143 static u_int64_t
dccp_seqno(const struct dccp_hdr
*dh
)
145 u_int32_t seq_high
= DCCPH_SEQ(dh
);
146 u_int64_t seqno
= EXTRACT_24BITS(&seq_high
) & 0xFFFFFF;
148 if (DCCPH_X(dh
) != 0) {
149 const struct dccp_hdr_ext
*dhx
= (void *)(dh
+ 1);
150 u_int32_t seq_low
= dhx
->dccph_seq_low
;
151 seqno
&= 0x00FFFF; /* clear reserved field */
152 seqno
= (seqno
<< 32) + EXTRACT_32BITS(&seq_low
);
158 static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr
*dh
)
160 return sizeof(*dh
) + (DCCPH_X(dh
) ? sizeof(struct dccp_hdr_ext
) : 0);
163 static void dccp_print_ack_no(const u_char
*bp
)
165 const struct dccp_hdr
*dh
= (const struct dccp_hdr
*)bp
;
166 const struct dccp_hdr_ack_bits
*dh_ack
=
167 (struct dccp_hdr_ack_bits
*)(bp
+ dccp_basic_hdr_len(dh
));
172 ack_high
= DCCPH_ACK(dh_ack
);
173 ackno
= EXTRACT_24BITS(&ack_high
) & 0xFFFFFF;
175 if (DCCPH_X(dh
) != 0) {
179 ack_low
= dh_ack
->dccph_ack_nr_low
;
181 ackno
&= 0x00FFFF; /* clear reserved field */
182 ackno
= (ackno
<< 32) + EXTRACT_32BITS(&ack_low
);
185 (void)printf("(ack=%" PRIu64
") ", ackno
);
190 static inline unsigned int dccp_packet_hdr_len(const u_int8_t type
)
192 if (type
== DCCP_PKT_DATA
)
194 if (type
== DCCP_PKT_DATAACK
||
195 type
== DCCP_PKT_ACK
||
196 type
== DCCP_PKT_SYNC
||
197 type
== DCCP_PKT_SYNCACK
||
198 type
== DCCP_PKT_CLOSE
||
199 type
== DCCP_PKT_CLOSEREQ
)
200 return sizeof(struct dccp_hdr_ack_bits
);
201 if (type
== DCCP_PKT_REQUEST
)
202 return sizeof(struct dccp_hdr_request
);
203 if (type
== DCCP_PKT_RESPONSE
)
204 return sizeof(struct dccp_hdr_response
);
205 return sizeof(struct dccp_hdr_reset
);
208 static int dccp_print_option(const u_char
*option
);
211 * dccp_print - show dccp packet
212 * @bp - beginning of dccp packet
213 * @data2 - beginning of enclosing
214 * @len - lenght of ip packet
216 void dccp_print(const u_char
*bp
, const u_char
*data2
, u_int len
)
218 const struct dccp_hdr
*dh
;
221 const struct ip6_hdr
*ip6
;
224 u_short sport
, dport
;
228 dh
= (const struct dccp_hdr
*)bp
;
230 ip
= (struct ip
*)data2
;
233 ip6
= (const struct ip6_hdr
*)data2
;
237 cp
= (const u_char
*)(dh
+ 1);
239 printf("[Invalid packet|dccp]");
243 if (len
< sizeof(struct dccp_hdr
)) {
244 printf("truncated-dccp - %ld bytes missing!",
245 (long)len
- sizeof(struct dccp_hdr
));
249 sport
= EXTRACT_16BITS(&dh
->dccph_sport
);
250 dport
= EXTRACT_16BITS(&dh
->dccph_dport
);
251 hlen
= dh
->dccph_doff
* 4;
255 (void)printf("%s.%d > %s.%d: ",
256 ip6addr_string(&ip6
->ip6_src
), sport
,
257 ip6addr_string(&ip6
->ip6_dst
), dport
);
261 (void)printf("%s.%d > %s.%d: ",
262 ipaddr_string(&ip
->ip_src
), sport
,
263 ipaddr_string(&ip
->ip_dst
), dport
);
268 (void)printf(" %d", len
- hlen
);
270 (void)printf("dccp [bad hdr length %u - too long, > %u]",
276 /* other variables in generic header */
278 (void)printf("CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh
), DCCPH_CSCOV(dh
));
281 /* checksum calculation */
284 if (ip6
->ip6_plen
&& vflag
) {
285 u_int16_t sum
, dccp_sum
;
287 sum
= dccp6_cksum(ip6
, dh
, len
);
288 dccp_sum
= EXTRACT_16BITS(&dh
->dccph_checksum
);
289 printf("cksum 0x%04x", dccp_sum
);
291 (void)printf(" (incorrect (-> 0x%04x), ",in_cksum_shouldbe(dccp_sum
, sum
));
293 (void)printf(" (correct), ");
299 u_int16_t sum
, dccp_sum
;
301 sum
= dccp_cksum(ip
, dh
, len
);
302 dccp_sum
= EXTRACT_16BITS(&dh
->dccph_checksum
);
303 printf("cksum 0x%04x", dccp_sum
);
305 (void)printf(" (incorrect (-> 0x%04x), ",in_cksum_shouldbe(dccp_sum
, sum
));
307 (void)printf(" (correct), ");
310 switch (DCCPH_TYPE(dh
)) {
311 case DCCP_PKT_REQUEST
: {
312 struct dccp_hdr_request
*dhr
=
313 (struct dccp_hdr_request
*)(bp
+ dccp_basic_hdr_len(dh
));
315 (void)printf("request (service=%d) ",
316 EXTRACT_32BITS(&dhr
->dccph_req_service
));
320 case DCCP_PKT_RESPONSE
: {
321 struct dccp_hdr_response
*dhr
=
322 (struct dccp_hdr_response
*)(bp
+ dccp_basic_hdr_len(dh
));
324 (void)printf("response (service=%d) ",
325 EXTRACT_32BITS(&dhr
->dccph_resp_service
));
330 (void)printf("data ");
333 (void)printf("ack ");
337 case DCCP_PKT_DATAACK
: {
338 (void)printf("dataack ");
342 case DCCP_PKT_CLOSEREQ
:
343 (void)printf("closereq ");
347 (void)printf("close ");
350 case DCCP_PKT_RESET
: {
351 struct dccp_hdr_reset
*dhr
=
352 (struct dccp_hdr_reset
*)(bp
+ dccp_basic_hdr_len(dh
));
354 (void)printf("reset (code=%s) ",
355 dccp_reset_code(dhr
->dccph_reset_code
));
360 (void)printf("sync ");
363 case DCCP_PKT_SYNCACK
:
364 (void)printf("syncack ");
368 (void)printf("invalid ");
372 if ((DCCPH_TYPE(dh
) != DCCP_PKT_DATA
) &&
373 (DCCPH_TYPE(dh
) != DCCP_PKT_REQUEST
))
374 dccp_print_ack_no(bp
);
379 (void)printf("seq %" PRIu64
, dccp_seqno(dh
));
381 /* process options */
382 if (hlen
> dccp_basic_hdr_len(dh
) + extlen
){
385 cp
= bp
+ dccp_basic_hdr_len(dh
) + extlen
;
388 hlen
-= dccp_basic_hdr_len(dh
) + extlen
;
391 optlen
= dccp_print_option(cp
);
392 if (!optlen
) goto trunc2
;
393 if (hlen
<= optlen
) break;
407 static int dccp_print_option(const u_char
*option
)
418 optlen
= *(option
+1);
420 printf("Option %d optlen too short",*option
);
425 TCHECK2(*option
,optlen
);
435 printf("slowreceiver");
439 if (*(option
+2) < 10){
440 printf(" %s", dccp_feature_nums
[*(option
+2)]);
441 for (i
= 0; i
< optlen
-3; i
++) printf(" %d", *(option
+3 + i
));
446 if (*(option
+2) < 10){
447 printf(" %s", dccp_feature_nums
[*(option
+2)]);
448 for (i
= 0; i
< optlen
-3; i
++) printf(" %d", *(option
+3 + i
));
453 if (*(option
+2) < 10){
454 printf(" %s", dccp_feature_nums
[*(option
+2)]);
455 for (i
= 0; i
< optlen
-3; i
++) printf(" %d", *(option
+3 + i
));
460 if (*(option
+2) < 10){
461 printf(" %s", dccp_feature_nums
[*(option
+2)]);
462 for (i
= 0; i
< optlen
-3; i
++) printf(" %d", *(option
+3 + i
));
466 printf("initcookie 0x");
467 for (i
= 0; i
< optlen
-2; i
++) printf("%02x", *(option
+2 + i
));
471 for (i
= 0; i
< optlen
-2; i
++) printf(" %d", *(option
+2 + i
));
474 printf("ack_vector0 0x");
475 for (i
= 0; i
< optlen
-2; i
++) printf("%02x", *(option
+2 + i
));
478 printf("ack_vector1 0x");
479 for (i
= 0; i
< optlen
-2; i
++) printf("%02x", *(option
+2 + i
));
482 printf("data_dropped 0x");
483 for (i
= 0; i
< optlen
-2; i
++) printf("%02x", *(option
+2 + i
));
486 ts
= (u_int32_t
*)(option
+ 2);
487 printf("timestamp %u", (u_int32_t
)ntohl(*ts
));
490 ts
= (u_int32_t
*)(option
+ 2);
491 printf("timestamp_echo %u", (u_int32_t
)ntohl(*ts
));
494 printf("elapsed_time ");
496 ts
= (u_int32_t
*)(option
+ 2);
497 printf("%u", (u_int32_t
)ntohl(*ts
));
499 var16
= (u_int16_t
*)(option
+ 2);
500 printf("%u", ntohs(*var16
));
504 printf("data_checksum ");
505 for (i
= 0; i
< optlen
-2; i
++) printf("%02x", *(option
+2 + i
));
508 if (*option
>= 128) {
509 printf("CCID option %d",*option
);
512 var16
= (u_int16_t
*)(option
+ 2);
513 printf(" %u",ntohs(*var16
));
516 var32
= (u_int32_t
*)(option
+ 2);
517 printf(" %u",(u_int32_t
)ntohl(*var32
));
525 printf("unknown_opt %d", *option
);