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 1.7.2.1 2007-11-09 00:45:16 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 inline int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
67 if (DCCPH_CSCOV(dh) == 0)
69 cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(u_int32_t);
70 return (cov > len)? len : cov;
73 static int dccp_cksum(const struct ip *ip,
74 const struct dccp_hdr *dh, u_int len)
76 int cov = dccp_csum_coverage(dh, len);
91 phu.ph.len = htons(len);
92 phu.ph.proto = IPPROTO_DCCP;
93 memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t));
95 memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));
97 phu.ph.dst = ip_finddst(ip);
100 return in_cksum((u_short *)dh, cov, sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]);
104 static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len)
108 int cov = dccp_csum_coverage(dh, len);
111 struct in6_addr ph_src;
112 struct in6_addr ph_dst;
121 memset(&phu, 0, sizeof(phu));
122 phu.ph.ph_src = ip6->ip6_src;
123 phu.ph.ph_dst = ip6->ip6_dst;
124 phu.ph.ph_len = htonl(len);
125 phu.ph.ph_nxt = IPPROTO_DCCP;
127 for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
130 return in_cksum((u_short *)dh, cov, sum);
134 static const char *dccp_reset_code(u_int8_t code)
136 if (code >= __DCCP_RESET_CODE_LAST)
138 return dccp_reset_codes[code];
141 static u_int64_t dccp_seqno(const struct dccp_hdr *dh)
143 u_int32_t seq_high = DCCPH_SEQ(dh);
144 u_int64_t seqno = EXTRACT_24BITS(&seq_high) & 0xFFFFFF;
146 if (DCCPH_X(dh) != 0) {
147 const struct dccp_hdr_ext *dhx = (void *)(dh + 1);
148 u_int32_t seq_low = dhx->dccph_seq_low;
149 seqno &= 0x00FFFF; /* clear reserved field */
150 seqno = (seqno << 32) + EXTRACT_32BITS(&seq_low);
156 static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
158 return sizeof(*dh) + (DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : 0);
161 static void dccp_print_ack_no(const u_char *bp)
163 const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
164 const struct dccp_hdr_ack_bits *dh_ack =
165 (struct dccp_hdr_ack_bits *)(bp + dccp_basic_hdr_len(dh));
170 ack_high = DCCPH_ACK(dh_ack);
171 ackno = EXTRACT_24BITS(&ack_high) & 0xFFFFFF;
173 if (DCCPH_X(dh) != 0) {
177 ack_low = dh_ack->dccph_ack_nr_low;
179 ackno &= 0x00FFFF; /* clear reserved field */
180 ackno = (ackno << 32) + EXTRACT_32BITS(&ack_low);
183 (void)printf("(ack=%" PRIu64 ") ", ackno);
188 static inline unsigned int dccp_packet_hdr_len(const u_int8_t type)
190 if (type == DCCP_PKT_DATA)
192 if (type == DCCP_PKT_DATAACK ||
193 type == DCCP_PKT_ACK ||
194 type == DCCP_PKT_SYNC ||
195 type == DCCP_PKT_SYNCACK ||
196 type == DCCP_PKT_CLOSE ||
197 type == DCCP_PKT_CLOSEREQ)
198 return sizeof(struct dccp_hdr_ack_bits);
199 if (type == DCCP_PKT_REQUEST)
200 return sizeof(struct dccp_hdr_request);
201 if (type == DCCP_PKT_RESPONSE)
202 return sizeof(struct dccp_hdr_response);
203 return sizeof(struct dccp_hdr_reset);
206 static int dccp_print_option(const u_char *option);
209 * dccp_print - show dccp packet
210 * @bp - beginning of dccp packet
211 * @data2 - beginning of enclosing
212 * @len - lenght of ip packet
214 void dccp_print(const u_char *bp, const u_char *data2, u_int len)
216 const struct dccp_hdr *dh;
219 const struct ip6_hdr *ip6;
222 u_short sport, dport;
226 dh = (const struct dccp_hdr *)bp;
228 ip = (struct ip *)data2;
231 ip6 = (const struct ip6_hdr *)data2;
235 cp = (const u_char *)(dh + 1);
237 printf("[Invalid packet|dccp]");
241 if (len < sizeof(struct dccp_hdr)) {
242 printf("truncated-dccp - %ld bytes missing!",
243 (long)len - sizeof(struct dccp_hdr));
247 sport = EXTRACT_16BITS(&dh->dccph_sport);
248 dport = EXTRACT_16BITS(&dh->dccph_dport);
249 hlen = dh->dccph_doff * 4;
253 (void)printf("%s.%d > %s.%d: ",
254 ip6addr_string(&ip6->ip6_src), sport,
255 ip6addr_string(&ip6->ip6_dst), dport);
259 (void)printf("%s.%d > %s.%d: ",
260 ipaddr_string(&ip->ip_src), sport,
261 ipaddr_string(&ip->ip_dst), dport);
266 (void)printf(" %d", len - hlen);
268 (void)printf("dccp [bad hdr length %u - too long, > %u]",
274 /* other variables in generic header */
276 (void)printf("CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh));
279 /* checksum calculation */
280 if (vflag && TTEST2(bp[0], len)) {
281 u_int16_t sum = 0, dccp_sum;
283 dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
284 (void)printf("cksum 0x%04x ", dccp_sum);
286 sum = dccp_cksum(ip, dh, len);
288 else if (IP_V(ip) == 6)
289 sum = dccp6_cksum(ip6, dh, len);
292 (void)printf("(incorrect -> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum));
294 (void)printf("(correct), ");
297 switch (DCCPH_TYPE(dh)) {
298 case DCCP_PKT_REQUEST: {
299 struct dccp_hdr_request *dhr =
300 (struct dccp_hdr_request *)(bp + dccp_basic_hdr_len(dh));
302 (void)printf("request (service=%d) ",
303 EXTRACT_32BITS(&dhr->dccph_req_service));
307 case DCCP_PKT_RESPONSE: {
308 struct dccp_hdr_response *dhr =
309 (struct dccp_hdr_response *)(bp + dccp_basic_hdr_len(dh));
311 (void)printf("response (service=%d) ",
312 EXTRACT_32BITS(&dhr->dccph_resp_service));
317 (void)printf("data ");
320 (void)printf("ack ");
324 case DCCP_PKT_DATAACK: {
325 (void)printf("dataack ");
329 case DCCP_PKT_CLOSEREQ:
330 (void)printf("closereq ");
334 (void)printf("close ");
337 case DCCP_PKT_RESET: {
338 struct dccp_hdr_reset *dhr =
339 (struct dccp_hdr_reset *)(bp + dccp_basic_hdr_len(dh));
341 (void)printf("reset (code=%s) ",
342 dccp_reset_code(dhr->dccph_reset_code));
347 (void)printf("sync ");
350 case DCCP_PKT_SYNCACK:
351 (void)printf("syncack ");
355 (void)printf("invalid ");
359 if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
360 (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
361 dccp_print_ack_no(bp);
366 (void)printf("seq %" PRIu64, dccp_seqno(dh));
368 /* process options */
369 if (hlen > dccp_basic_hdr_len(dh) + extlen){
372 cp = bp + dccp_basic_hdr_len(dh) + extlen;
375 hlen -= dccp_basic_hdr_len(dh) + extlen;
378 optlen = dccp_print_option(cp);
379 if (!optlen) goto trunc2;
380 if (hlen <= optlen) break;
394 static int dccp_print_option(const u_char *option)
405 optlen = *(option +1);
407 printf("Option %d optlen too short",*option);
412 TCHECK2(*option,optlen);
422 printf("slowreceiver");
426 if (*(option +2) < 10){
427 printf(" %s", dccp_feature_nums[*(option +2)]);
428 for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
433 if (*(option +2) < 10){
434 printf(" %s", dccp_feature_nums[*(option +2)]);
435 for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
440 if (*(option +2) < 10){
441 printf(" %s", dccp_feature_nums[*(option +2)]);
442 for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
447 if (*(option +2) < 10){
448 printf(" %s", dccp_feature_nums[*(option +2)]);
449 for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
453 printf("initcookie 0x");
454 for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
458 for (i = 0; i < optlen -2; i ++) printf(" %d", *(option +2 + i));
461 printf("ack_vector0 0x");
462 for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
465 printf("ack_vector1 0x");
466 for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
469 printf("data_dropped 0x");
470 for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
473 ts = (u_int32_t *)(option + 2);
474 printf("timestamp %u", (u_int32_t)ntohl(*ts));
477 ts = (u_int32_t *)(option + 2);
478 printf("timestamp_echo %u", (u_int32_t)ntohl(*ts));
481 printf("elapsed_time ");
483 ts = (u_int32_t *)(option + 2);
484 printf("%u", (u_int32_t)ntohl(*ts));
486 var16 = (u_int16_t *)(option + 2);
487 printf("%u", ntohs(*var16));
491 printf("data_checksum ");
492 for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
495 if (*option >= 128) {
496 printf("CCID option %d",*option);
499 var16 = (u_int16_t *)(option + 2);
500 printf(" %u",ntohs(*var16));
503 var32 = (u_int32_t *)(option + 2);
504 printf(" %u",(u_int32_t)ntohl(*var32));
512 printf("unknown_opt %d", *option);