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-rw-r--r--contrib/tcpdump/print-dccp.c636
1 files changed, 636 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-dccp.c b/contrib/tcpdump/print-dccp.c
new file mode 100644
index 000000000000..34d78c3173b3
--- /dev/null
+++ b/contrib/tcpdump/print-dccp.c
@@ -0,0 +1,636 @@
+/*
+ * 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
+ */
+
+#define NETDISSECT_REWORKED
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.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"
+
+/**
+ * struct dccp_hdr - generic part of DCCP packet header, with a 24-bit
+ * sequence number
+ *
+ * @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 - 24-bit sequence number
+ */
+struct dccp_hdr {
+ uint16_t dccph_sport,
+ dccph_dport;
+ uint8_t dccph_doff;
+ uint8_t dccph_ccval_cscov;
+ uint16_t dccph_checksum;
+ uint8_t dccph_xtr;
+ uint8_t dccph_seq[3];
+} UNALIGNED;
+
+/**
+ * struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit
+ * sequence number
+ *
+ * @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 - 48-bit sequence number
+ */
+struct dccp_hdr_ext {
+ uint16_t dccph_sport,
+ dccph_dport;
+ uint8_t dccph_doff;
+ uint8_t dccph_ccval_cscov;
+ uint16_t dccph_checksum;
+ uint8_t dccph_xtr;
+ uint8_t reserved;
+ uint8_t dccph_seq[6];
+} UNALIGNED;
+
+#define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov >> 4) & 0xF)
+#define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov) & 0xF)
+
+#define DCCPH_X(dh) ((dh)->dccph_xtr & 1)
+#define DCCPH_TYPE(dh) (((dh)->dccph_xtr >> 1) & 0xF)
+
+/**
+ * struct dccp_hdr_request - Conection initiation request header
+ *
+ * @dccph_req_service - Service to which the client app wants to connect
+ */
+struct dccp_hdr_request {
+ uint32_t dccph_req_service;
+} UNALIGNED;
+
+/**
+ * struct dccp_hdr_response - Conection initiation response header
+ *
+ * @dccph_resp_ack - 48 bit ack number, contains GSR
+ * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
+ */
+struct dccp_hdr_response {
+ uint8_t dccph_resp_ack[8]; /* always 8 bytes */
+ uint32_t dccph_resp_service;
+} UNALIGNED;
+
+/**
+ * struct dccp_hdr_reset - Unconditionally shut down a connection
+ *
+ * @dccph_resp_ack - 48 bit ack number
+ * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
+ */
+struct dccp_hdr_reset {
+ uint8_t dccph_reset_ack[8]; /* always 8 bytes */
+ uint8_t dccph_reset_code,
+ dccph_reset_data[3];
+} UNALIGNED;
+
+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
+};
+
+static const char tstr[] = "[|dccp]";
+
+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 inline u_int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
+{
+ u_int cov;
+
+ if (DCCPH_CSCOV(dh) == 0)
+ return len;
+ cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
+ return (cov > len)? len : cov;
+}
+
+static int dccp_cksum(netdissect_options *ndo, const struct ip *ip,
+ const struct dccp_hdr *dh, u_int len)
+{
+ return nextproto4_cksum(ndo, ip, (const uint8_t *)(void *)dh, len,
+ dccp_csum_coverage(dh, len), IPPROTO_DCCP);
+}
+
+#ifdef INET6
+static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len)
+{
+ return nextproto6_cksum(ip6, (const uint8_t *)(void *)dh, len,
+ dccp_csum_coverage(dh, len), IPPROTO_DCCP);
+}
+#endif
+
+static const char *dccp_reset_code(uint8_t code)
+{
+ if (code >= __DCCP_RESET_CODE_LAST)
+ return "invalid";
+ return dccp_reset_codes[code];
+}
+
+static uint64_t dccp_seqno(const u_char *bp)
+{
+ const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
+ uint64_t seqno;
+
+ if (DCCPH_X(dh) != 0) {
+ const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
+ seqno = EXTRACT_48BITS(dhx->dccph_seq);
+ } else {
+ seqno = EXTRACT_24BITS(dh->dccph_seq);
+ }
+
+ return seqno;
+}
+
+static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
+{
+ return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
+}
+
+static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
+{
+ const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
+ const u_char *ackp = bp + dccp_basic_hdr_len(dh);
+ uint64_t ackno;
+
+ if (DCCPH_X(dh) != 0) {
+ ND_TCHECK2(*ackp, 8);
+ ackno = EXTRACT_48BITS(ackp + 2);
+ } else {
+ ND_TCHECK2(*ackp, 4);
+ ackno = EXTRACT_24BITS(ackp + 1);
+ }
+
+ ND_PRINT((ndo, "(ack=%" PRIu64 ") ", ackno));
+trunc:
+ return;
+}
+
+static int dccp_print_option(netdissect_options *, const u_char *, u_int);
+
+/**
+ * dccp_print - show dccp packet
+ * @bp - beginning of dccp packet
+ * @data2 - beginning of enclosing
+ * @len - lenght of ip packet
+ */
+void dccp_print(netdissect_options *ndo, 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 fixed_hdrlen;
+
+ 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*/
+
+ /* make sure we have enough data to look at the X bit */
+ cp = (const u_char *)(dh + 1);
+ if (cp > ndo->ndo_snapend) {
+ ND_PRINT((ndo, "[Invalid packet|dccp]"));
+ return;
+ }
+ if (len < sizeof(struct dccp_hdr)) {
+ ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
+ len - (u_int)sizeof(struct dccp_hdr)));
+ return;
+ }
+
+ /* get the length of the generic header */
+ fixed_hdrlen = dccp_basic_hdr_len(dh);
+ if (len < fixed_hdrlen) {
+ ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
+ len - fixed_hdrlen));
+ return;
+ }
+ ND_TCHECK2(*dh, fixed_hdrlen);
+
+ sport = EXTRACT_16BITS(&dh->dccph_sport);
+ dport = EXTRACT_16BITS(&dh->dccph_dport);
+ hlen = dh->dccph_doff * 4;
+
+#ifdef INET6
+ if (ip6) {
+ ND_PRINT((ndo, "%s.%d > %s.%d: ",
+ ip6addr_string(ndo, &ip6->ip6_src), sport,
+ ip6addr_string(ndo, &ip6->ip6_dst), dport));
+ } else
+#endif /*INET6*/
+ {
+ ND_PRINT((ndo, "%s.%d > %s.%d: ",
+ ipaddr_string(ndo, &ip->ip_src), sport,
+ ipaddr_string(ndo, &ip->ip_dst), dport));
+ }
+
+ if (ndo->ndo_qflag) {
+ ND_PRINT((ndo, " %d", len - hlen));
+ if (hlen > len) {
+ ND_PRINT((ndo, "dccp [bad hdr length %u - too long, > %u]",
+ hlen, len));
+ }
+ return;
+ }
+
+ /* other variables in generic header */
+ if (ndo->ndo_vflag) {
+ ND_PRINT((ndo, "CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh)));
+ }
+
+ /* checksum calculation */
+ if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) {
+ uint16_t sum = 0, dccp_sum;
+
+ dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
+ ND_PRINT((ndo, "cksum 0x%04x ", dccp_sum));
+ if (IP_V(ip) == 4)
+ sum = dccp_cksum(ndo, ip, dh, len);
+#ifdef INET6
+ else if (IP_V(ip) == 6)
+ sum = dccp6_cksum(ip6, dh, len);
+#endif
+ if (sum != 0)
+ ND_PRINT((ndo, "(incorrect -> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum)));
+ else
+ ND_PRINT((ndo, "(correct), "));
+ }
+
+ switch (DCCPH_TYPE(dh)) {
+ case DCCP_PKT_REQUEST: {
+ struct dccp_hdr_request *dhr =
+ (struct dccp_hdr_request *)(bp + fixed_hdrlen);
+ fixed_hdrlen += 4;
+ if (len < fixed_hdrlen) {
+ ND_PRINT((ndo, "truncated-dccp request - %u bytes missing!",
+ len - fixed_hdrlen));
+ return;
+ }
+ ND_TCHECK(*dhr);
+ ND_PRINT((ndo, "request (service=%d) ",
+ EXTRACT_32BITS(&dhr->dccph_req_service)));
+ break;
+ }
+ case DCCP_PKT_RESPONSE: {
+ struct dccp_hdr_response *dhr =
+ (struct dccp_hdr_response *)(bp + fixed_hdrlen);
+ fixed_hdrlen += 12;
+ if (len < fixed_hdrlen) {
+ ND_PRINT((ndo, "truncated-dccp response - %u bytes missing!",
+ len - fixed_hdrlen));
+ return;
+ }
+ ND_TCHECK(*dhr);
+ ND_PRINT((ndo, "response (service=%d) ",
+ EXTRACT_32BITS(&dhr->dccph_resp_service)));
+ break;
+ }
+ case DCCP_PKT_DATA:
+ ND_PRINT((ndo, "data "));
+ break;
+ case DCCP_PKT_ACK: {
+ fixed_hdrlen += 8;
+ if (len < fixed_hdrlen) {
+ ND_PRINT((ndo, "truncated-dccp ack - %u bytes missing!",
+ len - fixed_hdrlen));
+ return;
+ }
+ ND_PRINT((ndo, "ack "));
+ break;
+ }
+ case DCCP_PKT_DATAACK: {
+ fixed_hdrlen += 8;
+ if (len < fixed_hdrlen) {
+ ND_PRINT((ndo, "truncated-dccp dataack - %u bytes missing!",
+ len - fixed_hdrlen));
+ return;
+ }
+ ND_PRINT((ndo, "dataack "));
+ break;
+ }
+ case DCCP_PKT_CLOSEREQ:
+ fixed_hdrlen += 8;
+ if (len < fixed_hdrlen) {
+ ND_PRINT((ndo, "truncated-dccp closereq - %u bytes missing!",
+ len - fixed_hdrlen));
+ return;
+ }
+ ND_PRINT((ndo, "closereq "));
+ break;
+ case DCCP_PKT_CLOSE:
+ fixed_hdrlen += 8;
+ if (len < fixed_hdrlen) {
+ ND_PRINT((ndo, "truncated-dccp close - %u bytes missing!",
+ len - fixed_hdrlen));
+ return;
+ }
+ ND_PRINT((ndo, "close "));
+ break;
+ case DCCP_PKT_RESET: {
+ struct dccp_hdr_reset *dhr =
+ (struct dccp_hdr_reset *)(bp + fixed_hdrlen);
+ fixed_hdrlen += 12;
+ if (len < fixed_hdrlen) {
+ ND_PRINT((ndo, "truncated-dccp reset - %u bytes missing!",
+ len - fixed_hdrlen));
+ return;
+ }
+ ND_TCHECK(*dhr);
+ ND_PRINT((ndo, "reset (code=%s) ",
+ dccp_reset_code(dhr->dccph_reset_code)));
+ break;
+ }
+ case DCCP_PKT_SYNC:
+ fixed_hdrlen += 8;
+ if (len < fixed_hdrlen) {
+ ND_PRINT((ndo, "truncated-dccp sync - %u bytes missing!",
+ len - fixed_hdrlen));
+ return;
+ }
+ ND_PRINT((ndo, "sync "));
+ break;
+ case DCCP_PKT_SYNCACK:
+ fixed_hdrlen += 8;
+ if (len < fixed_hdrlen) {
+ ND_PRINT((ndo, "truncated-dccp syncack - %u bytes missing!",
+ len - fixed_hdrlen));
+ return;
+ }
+ ND_PRINT((ndo, "syncack "));
+ break;
+ default:
+ ND_PRINT((ndo, "invalid "));
+ break;
+ }
+
+ if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
+ (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
+ dccp_print_ack_no(ndo, bp);
+
+ if (ndo->ndo_vflag < 2)
+ return;
+
+ ND_PRINT((ndo, "seq %" PRIu64, dccp_seqno(bp)));
+
+ /* process options */
+ if (hlen > fixed_hdrlen){
+ const u_char *cp;
+ u_int optlen;
+ cp = bp + fixed_hdrlen;
+ ND_PRINT((ndo, " <"));
+
+ hlen -= fixed_hdrlen;
+ while(1){
+ optlen = dccp_print_option(ndo, cp, hlen);
+ if (!optlen)
+ break;
+ if (hlen <= optlen)
+ break;
+ hlen -= optlen;
+ cp += optlen;
+ ND_PRINT((ndo, ", "));
+ }
+ ND_PRINT((ndo, ">"));
+ }
+ return;
+trunc:
+ ND_PRINT((ndo, "%s", tstr));
+ return;
+}
+
+static const struct tok dccp_option_values[] = {
+ { 0, "nop" },
+ { 1, "mandatory" },
+ { 2, "slowreceiver" },
+ { 32, "change_l" },
+ { 33, "confirm_l" },
+ { 34, "change_r" },
+ { 35, "confirm_r" },
+ { 36, "initcookie" },
+ { 37, "ndp_count" },
+ { 38, "ack_vector0" },
+ { 39, "ack_vector1" },
+ { 40, "data_dropped" },
+ { 41, "timestamp" },
+ { 42, "timestamp_echo" },
+ { 43, "elapsed_time" },
+ { 44, "data_checksum" },
+ { 0, NULL }
+};
+
+static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
+{
+ uint8_t optlen, i;
+
+ ND_TCHECK(*option);
+
+ if (*option >= 32) {
+ ND_TCHECK(*(option+1));
+ optlen = *(option +1);
+ if (optlen < 2) {
+ if (*option >= 128)
+ ND_PRINT((ndo, "CCID option %u optlen too short", *option));
+ else
+ ND_PRINT((ndo, "%s optlen too short",
+ tok2str(dccp_option_values, "Option %u", *option)));
+ return 0;
+ }
+ } else
+ optlen = 1;
+
+ if (hlen < optlen) {
+ if (*option >= 128)
+ ND_PRINT((ndo, "CCID option %u optlen goes past header length",
+ *option));
+ else
+ ND_PRINT((ndo, "%s optlen goes past header length",
+ tok2str(dccp_option_values, "Option %u", *option)));
+ return 0;
+ }
+ ND_TCHECK2(*option, optlen);
+
+ if (*option >= 128) {
+ ND_PRINT((ndo, "CCID option %d", *option));
+ switch (optlen) {
+ case 4:
+ ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
+ break;
+ case 6:
+ ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
+ break;
+ default:
+ break;
+ }
+ } else {
+ ND_PRINT((ndo, "%s", tok2str(dccp_option_values, "Option %u", *option)));
+ switch (*option) {
+ case 32:
+ case 33:
+ case 34:
+ case 35:
+ if (optlen < 3) {
+ ND_PRINT((ndo, " optlen too short"));
+ return optlen;
+ }
+ if (*(option + 2) < 10){
+ ND_PRINT((ndo, " %s", dccp_feature_nums[*(option + 2)]));
+ for (i = 0; i < optlen - 3; i++)
+ ND_PRINT((ndo, " %d", *(option + 3 + i)));
+ }
+ break;
+ case 36:
+ if (optlen > 2) {
+ ND_PRINT((ndo, " 0x"));
+ for (i = 0; i < optlen - 2; i++)
+ ND_PRINT((ndo, "%02x", *(option + 2 + i)));
+ }
+ break;
+ case 37:
+ for (i = 0; i < optlen - 2; i++)
+ ND_PRINT((ndo, " %d", *(option + 2 + i)));
+ break;
+ case 38:
+ if (optlen > 2) {
+ ND_PRINT((ndo, " 0x"));
+ for (i = 0; i < optlen - 2; i++)
+ ND_PRINT((ndo, "%02x", *(option + 2 + i)));
+ }
+ break;
+ case 39:
+ if (optlen > 2) {
+ ND_PRINT((ndo, " 0x"));
+ for (i = 0; i < optlen - 2; i++)
+ ND_PRINT((ndo, "%02x", *(option + 2 + i)));
+ }
+ break;
+ case 40:
+ if (optlen > 2) {
+ ND_PRINT((ndo, " 0x"));
+ for (i = 0; i < optlen - 2; i++)
+ ND_PRINT((ndo, "%02x", *(option + 2 + i)));
+ }
+ break;
+ case 41:
+ if (optlen == 4)
+ ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
+ else
+ ND_PRINT((ndo, " optlen != 4"));
+ break;
+ case 42:
+ if (optlen == 4)
+ ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
+ else
+ ND_PRINT((ndo, " optlen != 4"));
+ break;
+ case 43:
+ if (optlen == 6)
+ ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
+ else if (optlen == 4)
+ ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
+ else
+ ND_PRINT((ndo, " optlen != 4 or 6"));
+ break;
+ case 44:
+ if (optlen > 2) {
+ ND_PRINT((ndo, " "));
+ for (i = 0; i < optlen - 2; i++)
+ ND_PRINT((ndo, "%02x", *(option + 2 + i)));
+ }
+ break;
+ }
+ }
+
+ return optlen;
+trunc:
+ ND_PRINT((ndo, "%s", tstr));
+ return 0;
+}
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