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);