--- /dev/null
+#ifndef __DCCP_HDR__
+#define __DCCP_HDR__
+/*
+ * Copyright (C) Arnaldo Carvalho de Melo 2004
+ * Copyright (C) Yoshifumi Nishida 2005
+ *
+ * This software may be distributed either under the terms of the
+ * BSD-style license that accompanies tcpdump or the GNU GPL version 2
+ */
+
+/**
+ * struct dccp_hdr - generic part of DCCP packet header
+ *
+ * @dccph_sport - Relevant port on the endpoint that sent this packet
+ * @dccph_dport - Relevant port on the other endpoint
+ * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
+ * @dccph_ccval - Used by the HC-Sender CCID
+ * @dccph_cscov - Parts of the packet that are covered by the Checksum field
+ * @dccph_checksum - Internet checksum, depends on dccph_cscov
+ * @dccph_x - 0 = 24 bit sequence number, 1 = 48
+ * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
+ * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
+ */
+struct dccp_hdr {
+ u_int16_t dccph_sport,
+ dccph_dport;
+ u_int8_t dccph_doff;
+ u_int8_t dccph_ccval_cscov;
+ u_int16_t dccph_checksum;
+ union {
+ u_int8_t dccph_xtr;
+ u_int32_t dccph_seq;
+ } dccph_xtrs;
+};
+
+#define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov) & 0x0F)
+#define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov >> 4) & 0x0F)
+
+#define DCCPH_X(dh) ((dh)->dccph_xtrs.dccph_xtr & 1)
+#define DCCPH_TYPE(dh) (((dh)->dccph_xtrs.dccph_xtr >> 1) & 0xF)
+#define DCCPH_SEQ(dh) (((dh)->dccph_xtrs.dccph_seq) >> 8)
+
+/**
+ * struct dccp_hdr_ext - the low bits of a 48 bit seq packet
+ *
+ * @dccph_seq_low - low 24 bits of a 48 bit seq packet
+ */
+struct dccp_hdr_ext {
+ u_int32_t dccph_seq_low;
+};
+
+/**
+ * struct dccp_hdr_request - Conection initiation request header
+ *
+ * @dccph_req_service - Service to which the client app wants to connect
+ */
+struct dccp_hdr_request {
+ u_int32_t dccph_req_service;
+};
+
+/**
+ * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
+ *
+ * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
+ * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
+ */
+struct dccp_hdr_ack_bits {
+ u_int32_t dccph_ra;
+ u_int32_t dccph_ack_nr_low;
+};
+
+#define DCCPH_ACK(dh_ack) ((dh_ack)->dccph_ra >> 8)
+
+/**
+ * struct dccp_hdr_response - Conection initiation response header
+ *
+ * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
+ * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
+ * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
+ */
+struct dccp_hdr_response {
+ struct dccp_hdr_ack_bits dccph_resp_ack;
+ u_int32_t dccph_resp_service;
+};
+
+static inline struct dccp_hdr_data *dccp_hdr_data(struct dccp_hdr *hdrg)
+{
+ const int ext = DCCPH_X(hdrg) ? sizeof(struct dccp_hdr_ext) : 0;
+
+ return (struct dccp_hdr_data *)(((u_char *)hdrg) + sizeof(hdrg) + ext);
+}
+
+/**
+ * struct dccp_hdr_reset - Unconditionally shut down a connection
+ *
+ * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
+ */
+struct dccp_hdr_reset {
+ struct dccp_hdr_ack_bits dccph_reset_ack;
+ u_int8_t dccph_reset_code,
+ dccph_reset_data[3];
+};
+
+enum dccp_pkt_type {
+ DCCP_PKT_REQUEST = 0,
+ DCCP_PKT_RESPONSE,
+ DCCP_PKT_DATA,
+ DCCP_PKT_ACK,
+ DCCP_PKT_DATAACK,
+ DCCP_PKT_CLOSEREQ,
+ DCCP_PKT_CLOSE,
+ DCCP_PKT_RESET,
+ DCCP_PKT_SYNC,
+ DCCP_PKT_SYNCACK,
+ DCCP_PKT_INVALID,
+};
+
+enum dccp_reset_codes {
+ DCCP_RESET_CODE_UNSPECIFIED = 0,
+ DCCP_RESET_CODE_CLOSED,
+ DCCP_RESET_CODE_ABORTED,
+ DCCP_RESET_CODE_NO_CONNECTION,
+ DCCP_RESET_CODE_PACKET_ERROR,
+ DCCP_RESET_CODE_OPTION_ERROR,
+ DCCP_RESET_CODE_MANDATORY_ERROR,
+ DCCP_RESET_CODE_CONNECTION_REFUSED,
+ DCCP_RESET_CODE_BAD_SERVICE_CODE,
+ DCCP_RESET_CODE_TOO_BUSY,
+ DCCP_RESET_CODE_BAD_INIT_COOKIE,
+ DCCP_RESET_CODE_AGGRESSION_PENALTY,
+ __DCCP_RESET_CODE_LAST,
+};
+
+#endif /* __DCCP_HDR__ */
--- /dev/null
+/*
+ * Copyright (C) Arnaldo Carvalho de Melo 2004
+ * Copyright (C) Ian McDonald 2005
+ * Copyright (C) Yoshifumi Nishida 2005
+ *
+ * This software may be distributed either under the terms of the
+ * BSD-style license that accompanies tcpdump or the GNU GPL version 2
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.h>
+
+#include "dccp.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include "interface.h"
+#include "addrtoname.h"
+#include "extract.h" /* must come after interface.h */
+#include "ip.h"
+#ifdef INET6
+#include "ip6.h"
+#endif
+#include "ipproto.h"
+
+static const char *dccp_reset_codes[] = {
+ "unspecified",
+ "closed",
+ "aborted",
+ "no_connection",
+ "packet_error",
+ "option_error",
+ "mandatory_error",
+ "connection_refused",
+ "bad_service_code",
+ "too_busy",
+ "bad_init_cookie",
+ "aggression_penalty",
+};
+
+static const char *dccp_feature_nums[] = {
+ "reserved",
+ "ccid",
+ "allow_short_seqno",
+ "sequence_window",
+ "ecn_incapable",
+ "ack_ratio",
+ "send_ack_vector",
+ "send_ndp_count",
+ "minimum checksum coverage",
+ "check data checksum",
+};
+
+static int dccp_cksum(const struct ip *ip,
+ const struct dccp_hdr *dh, u_int len)
+{
+ union phu {
+ struct phdr {
+ u_int32_t src;
+ u_int32_t dst;
+ u_char mbz;
+ u_char proto;
+ u_int16_t len;
+ } ph;
+ u_int16_t pa[6];
+ } phu;
+ const u_int16_t *sp;
+
+ /* pseudo-header.. */
+ phu.ph.mbz = 0;
+ phu.ph.len = htons(len);
+ phu.ph.proto = IPPROTO_DCCP;
+ memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t));
+ if (IP_HL(ip) == 5)
+ memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));
+ else
+ phu.ph.dst = ip_finddst(ip);
+
+ sp = &phu.pa[0];
+ return in_cksum((u_short *)dh, len, sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]);
+}
+
+#ifdef INET6
+static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len)
+{
+ size_t i;
+ const u_int16_t *sp;
+ u_int32_t sum;
+ union {
+ struct {
+ struct in6_addr ph_src;
+ struct in6_addr ph_dst;
+ u_int32_t ph_len;
+ u_int8_t ph_zero[3];
+ u_int8_t ph_nxt;
+ } ph;
+ u_int16_t pa[20];
+ } phu;
+
+ /* pseudo-header */
+ memset(&phu, 0, sizeof(phu));
+ phu.ph.ph_src = ip6->ip6_src;
+ phu.ph.ph_dst = ip6->ip6_dst;
+ phu.ph.ph_len = htonl(len);
+ phu.ph.ph_nxt = IPPROTO_DCCP;
+
+ sum = 0;
+ for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
+ sum += phu.pa[i];
+
+ sp = (const u_int16_t *)dh;
+
+ for (i = 0; i < (len & ~1); i += 2)
+ sum += *sp++;
+
+ if (len & 1)
+ sum += htons((*(const u_int8_t *)sp) << 8);
+
+ while (sum > 0xffff)
+ sum = (sum & 0xffff) + (sum >> 16);
+ sum = ~sum & 0xffff;
+
+ return (sum);
+}
+#endif
+
+static const char *dccp_reset_code(u_int8_t code)
+{
+ if (code >= __DCCP_RESET_CODE_LAST)
+ return "invalid";
+ return dccp_reset_codes[code];
+}
+
+static u_int64_t dccp_seqno(const struct dccp_hdr *dh)
+{
+ u_int32_t seq_high = DCCPH_SEQ(dh);
+ u_int64_t seqno = EXTRACT_24BITS(&seq_high) & 0xFFFFFF;
+
+ if (DCCPH_X(dh) != 0) {
+ const struct dccp_hdr_ext *dhx = (void *)dh + sizeof(*dh);
+ u_int32_t seq_low = dhx->dccph_seq_low;
+ seqno &= 0x00FFFF; /* clear reserved field */
+ seqno = (seqno << 32) + EXTRACT_32BITS(&seq_low);
+ }
+
+ return seqno;
+}
+
+static u_int64_t dccp_ack_no(const struct dccp_hdr *dh,
+ const struct dccp_hdr_ack_bits *dh_ack)
+{
+ u_int32_t ack_high = DCCPH_ACK(dh_ack);
+ u_int64_t ackno = EXTRACT_24BITS(&ack_high) & 0xFFFFFF;
+
+ if (DCCPH_X(dh) != 0) {
+ u_int32_t ack_low = dh_ack->dccph_ack_nr_low;
+
+ ackno &= 0x00FFFF; /* clear reserved field */
+ ackno = (ackno << 32) + EXTRACT_32BITS(&ack_low);
+ }
+
+ return ackno;
+}
+
+static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
+{
+ return sizeof(*dh) + (DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : 0);
+}
+
+static inline unsigned int dccp_packet_hdr_len(const u_int8_t type)
+{
+ if (type == DCCP_PKT_DATA)
+ return 0;
+ if (type == DCCP_PKT_DATAACK ||
+ type == DCCP_PKT_ACK ||
+ type == DCCP_PKT_SYNC ||
+ type == DCCP_PKT_SYNCACK ||
+ type == DCCP_PKT_CLOSE ||
+ type == DCCP_PKT_CLOSEREQ)
+ return sizeof(struct dccp_hdr_ack_bits);
+ if (type == DCCP_PKT_REQUEST)
+ return sizeof(struct dccp_hdr_request);
+ if (type == DCCP_PKT_RESPONSE)
+ return sizeof(struct dccp_hdr_response);
+ return sizeof(struct dccp_hdr_reset);
+}
+
+static int dccp_print_option(const u_char *option);
+
+/**
+ * dccp_print - show dccp packet
+ * @bp - beginning of dccp packet
+ * @data2 - beginning of enclosing
+ * @len - lenght of ip packet
+ */
+void dccp_print(const u_char *bp, const u_char *data2, u_int len)
+{
+ const struct dccp_hdr *dh;
+ const struct ip *ip;
+#ifdef INET6
+ const struct ip6_hdr *ip6;
+#endif
+ const u_char *cp;
+ u_short sport, dport;
+ u_int hlen;
+ u_int extlen = 0;
+
+ dh = (const struct dccp_hdr *)bp;
+
+ ip = (struct ip *)data2;
+#ifdef INET6
+ if (IP_V(ip) == 6)
+ ip6 = (const struct ip6_hdr *)data2;
+ else
+ ip6 = NULL;
+#endif /*INET6*/
+ cp = (const u_char *)(dh + 1);
+ if (cp > snapend) {
+ printf("[Invalid packet|dccp]");
+ return;
+ }
+
+ if (len < sizeof(struct dccp_hdr)) {
+ printf("truncated-dccp - %ld bytes missing!",
+ (long)len - sizeof(struct dccp_hdr));
+ return;
+ }
+
+ sport = EXTRACT_16BITS(&dh->dccph_sport);
+ dport = EXTRACT_16BITS(&dh->dccph_dport);
+ hlen = dh->dccph_doff * 4;
+
+#ifdef INET6
+ if (ip6) {
+ (void)printf("%s.%d > %s.%d: ",
+ ip6addr_string(&ip6->ip6_src), sport,
+ ip6addr_string(&ip6->ip6_dst), dport);
+ } else
+#endif /*INET6*/
+ {
+ (void)printf("%s.%d > %s.%d: ",
+ ipaddr_string(&ip->ip_src), sport,
+ ipaddr_string(&ip->ip_dst), dport);
+ }
+ fflush(stdout);
+
+ if (qflag) {
+ (void)printf(" %d", len - hlen);
+ if (hlen > len) {
+ (void)printf("dccp [bad hdr length %u - too long, > %u]",
+ hlen, len);
+ }
+ return;
+ }
+
+ /* other variables in generic header */
+ if (vflag) {
+ (void)printf("CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh));
+ }
+
+ /* checksum calculation */
+#ifdef INET6
+ if (ip6) {
+ if (ip6->ip6_plen && vflag) {
+ u_int16_t sum, dccp_sum;
+
+ sum = dccp6_cksum(ip6, dh, len);
+ dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
+ printf("cksum 0x%04x", dccp_sum);
+ if (sum != 0) {
+ (void)printf(" (incorrect (-> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum));
+ } else
+ (void)printf(" (correct), ");
+ }
+ } else
+#endif /* INET6 */
+ if (vflag)
+ {
+ u_int16_t sum, dccp_sum;
+
+ sum = dccp_cksum(ip, dh, len);
+ dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
+ printf("cksum 0x%04x", dccp_sum);
+ if (sum != 0) {
+ (void)printf(" (incorrect (-> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum));
+ } else
+ (void)printf(" (correct), ");
+ }
+
+ switch (DCCPH_TYPE(dh)) {
+ case DCCP_PKT_REQUEST: {
+ struct dccp_hdr_request *dhr =
+ (struct dccp_hdr_request *)(bp + dccp_basic_hdr_len(dh));
+ TCHECK(*dhr);
+ (void)printf("request (service=%d) ", dhr->dccph_req_service);
+ extlen += 4;
+ break;
+ }
+ case DCCP_PKT_RESPONSE: {
+ struct dccp_hdr_response *dhr =
+ (struct dccp_hdr_response *)(bp + dccp_basic_hdr_len(dh));
+ TCHECK(*dhr);
+ (void)printf("response (service=%d, ack=%" PRIu64 ") ",
+ dhr->dccph_resp_service,
+ dccp_ack_no(dh,&(dhr->dccph_resp_ack)));
+ extlen += 12;
+ break;
+ }
+ case DCCP_PKT_DATA:
+ (void)printf("data ");
+ break;
+ case DCCP_PKT_ACK: {
+ struct dccp_hdr_ack_bits *dha =
+ (struct dccp_hdr_ack_bits *)(bp + dccp_basic_hdr_len(dh));
+ TCHECK(*dha);
+ (void)printf("ack (ack=%" PRIu64 ") ",
+ dccp_ack_no(dh,dha));
+ extlen += 8;
+ break;
+ }
+ case DCCP_PKT_DATAACK: {
+ struct dccp_hdr_ack_bits *dha =
+ (struct dccp_hdr_ack_bits *)(bp + dccp_basic_hdr_len(dh));
+ TCHECK(*dha);
+ (void)printf("dataack (ack=%" PRIu64 ") ",
+ dccp_ack_no(dh,dha));
+ extlen += 8;
+ break;
+ }
+ case DCCP_PKT_CLOSEREQ:
+ (void)printf("closereq ");
+ extlen += 8;
+ break;
+ case DCCP_PKT_CLOSE:
+ (void)printf("close ");
+ extlen += 8;
+ break;
+ case DCCP_PKT_RESET: {
+ struct dccp_hdr_reset *dhr =
+ (struct dccp_hdr_reset *)(bp + dccp_basic_hdr_len(dh));
+ TCHECK(*dhr);
+ (void)printf("reset (code=%s) ",
+ dccp_reset_code(dhr->dccph_reset_code));
+ extlen += 12;
+ break;
+ }
+ case DCCP_PKT_SYNC:
+ (void)printf("sync ");
+ extlen += 8;
+ break;
+ case DCCP_PKT_SYNCACK:
+ (void)printf("syncack ");
+ extlen += 8;
+ break;
+ default:
+ (void)printf("invalid ");
+ break;
+ }
+
+ if (vflag < 2)
+ return;
+
+ (void)printf("seq %" PRIu64, dccp_seqno(dh));
+
+ /* process options */
+ if (hlen > dccp_basic_hdr_len(dh) + extlen){
+ const u_char *cp;
+ u_int optlen;
+ cp = bp + dccp_basic_hdr_len(dh) + extlen;
+ printf(" <");
+
+ hlen -= dccp_basic_hdr_len(dh) + extlen;
+ while(1){
+ TCHECK(*cp);
+ optlen = dccp_print_option(cp);
+ if (!optlen) goto trunc2;
+ if (hlen <= optlen) break;
+ hlen -= optlen;
+ cp += optlen;
+ printf(", ");
+ }
+ printf(">");
+ }
+ return;
+trunc:
+ printf("[|dccp]");
+trunc2:
+ return;
+}
+
+static int dccp_print_option(const u_char *option)
+{
+ u_int8_t optlen, i;
+ u_int32_t *ts;
+ u_int16_t *var16;
+ u_int32_t *var32;
+
+ TCHECK(*option);
+
+ if (*option >= 32) {
+ TCHECK(*(option+1));
+ optlen = *(option +1);
+ if (optlen < 2) {
+ printf("Option %d optlen too short",*option);
+ return 1;
+ }
+ } else optlen = 1;
+
+ TCHECK2(*option,optlen);
+
+ switch (*option){
+ case 0:
+ printf("nop");
+ break;
+ case 1:
+ printf("mandatory");
+ break;
+ case 2:
+ printf("slowreceiver");
+ break;
+ case 32:
+ printf("change_l");
+ if (*(option +2) < 10){
+ printf(" %s", dccp_feature_nums[*(option +2)]);
+ for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
+ }
+ break;
+ case 33:
+ printf("confirm_l");
+ if (*(option +2) < 10){
+ printf(" %s", dccp_feature_nums[*(option +2)]);
+ for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
+ }
+ break;
+ case 34:
+ printf("change_r");
+ if (*(option +2) < 10){
+ printf(" %s", dccp_feature_nums[*(option +2)]);
+ for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
+ }
+ break;
+ case 35:
+ printf("confirm_r");
+ if (*(option +2) < 10){
+ printf(" %s", dccp_feature_nums[*(option +2)]);
+ for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
+ }
+ break;
+ case 36:
+ printf("initcookie 0x");
+ for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
+ break;
+ case 37:
+ printf("ndp_count");
+ for (i = 0; i < optlen -2; i ++) printf(" %d", *(option +2 + i));
+ break;
+ case 38:
+ printf("ack_vector0 0x");
+ for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
+ break;
+ case 39:
+ printf("ack_vector1 0x");
+ for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
+ break;
+ case 40:
+ printf("data_dropped 0x");
+ for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
+ break;
+ case 41:
+ ts = (u_int32_t *)(option + 2);
+ printf("timestamp %u", (u_int32_t)ntohl(*ts));
+ break;
+ case 42:
+ ts = (u_int32_t *)(option + 2);
+ printf("timestamp_echo %u", (u_int32_t)ntohl(*ts));
+ break;
+ case 43:
+ printf("elapsed_time ");
+ if (optlen == 6){
+ ts = (u_int32_t *)(option + 2);
+ printf("%u", (u_int32_t)ntohl(*ts));
+ } else {
+ var16 = (u_int16_t *)(option + 2);
+ printf("%u", ntohs(*var16));
+ }
+ break;
+ case 44:
+ printf("data_checksum ");
+ for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
+ break;
+ default :
+ if (*option >= 128) {
+ printf("CCID option %d",*option);
+ switch (optlen) {
+ case 4:
+ var16 = (u_int16_t *)(option + 2);
+ printf(" %u",ntohs(*var16));
+ break;
+ case 6:
+ var32 = (u_int32_t *)(option + 2);
+ printf(" %u",(u_int32_t)ntohl(*var32));
+ break;
+ default:
+ break;
+ }
+ break;
+ }
+
+ printf("unknown_opt %d", *option);
+ break;
+ }
+
+ return optlen;
+trunc:
+ printf("[|dccp]");
+ return 0;
+}
projects / tcpdump / commitdiff
