--- /dev/null
+/* packet-dcp.c
+ * Routines for Datagram Congestion Control Protocol, "DCCP" dissection:
+ * it should be conformance to draft-ietf-dccp-spec-11.txt
+ *
+ * Copyright 2005 _FF_
+ *
+ * Francesco Fondelli <francesco dot fondelli, gmail dot com>
+ *
+ * $Id: README.developer 11973 2004-09-11 23:10:14Z guy $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * Copied from packet-udp.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licepnse
+ * as published by the Free Software Foundation; either version 2
+ * of the Licepnse, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public Licepnse for more details.
+ *
+ * You should have received a copy of the GNU General Public Licepnse
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+
+/* Note: PROTOABBREV name collision problem, 'dccp' is used by Distributed Checksum
+ Clearinghouse Protocol.
+ This dissector should be named packet-dccp.c IMHO.
+*/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <glib.h>
+#include <epan/packet.h>
+#include <epan/addr_resolv.h>
+#include <epan/ipproto.h>
+#include <epan/in_cksum.h>
+#include <epan/prefs.h>
+
+#include "packet-dcp.h"
+
+#include "packet-ip.h"
+#include <epan/conversation.h>
+#include <epan/tap.h>
+
+/* Some definitions and the dissect_options() logic have been taken from Arnaldo Carvalho de Melo's DCCP implementation, thanks! */
+
+#define DCCP_HDR_LEN 16 /* base DCCP header length, with 48 bits seqnos */
+#define DCCP_HDR_LEN_MIN 12 /* , with 24 bits seqnum */
+#define DCCP_HDR_PKT_TYPES_LEN_MAX 12 /* max per packet type extra header length */
+#define DCCP_OPT_LEN_MAX 1008
+#define DCCP_HDR_LEN_MAX (DCCP_HDR_LEN + DCCP_HDR_PKT_TYPES_LEN_MAX + DCCP_OPT_LEN_MAX)
+
+
+static const value_string dcp_packet_type_vals[] = {
+ {0x0, "Request"},
+ {0x1, "Response"},
+ {0x2, "Data"},
+ {0x3, "Ack"},
+ {0x4, "DataAck"},
+ {0x5, "CloseReq"},
+ {0x6, "Close"},
+ {0x7, "Reset"},
+ {0x8, "Sync"},
+ {0x9, "SyncAck"},
+ {0xA, "Reserved"},
+ {0xB, "Reserved"},
+ {0xC, "Reserved"},
+ {0xD, "Reserved"},
+ {0xE, "Reserved"},
+ {0xF, "Reserved"},
+ {0, NULL}
+};
+
+static const value_string dcp_reset_code_vals[] = {
+ {0x00, "Unspecified"},
+ {0x01, "Closed"},
+ {0x02, "Aborted"},
+ {0x03, "No Connection"},
+ {0x04, "Packet Error"},
+ {0x05, "Option Error"},
+ {0x06, "Mandatory Error"},
+ {0x07, "Connection Refused"},
+ {0x08, "Bad Service Code"},
+ {0x09, "Too Busy"},
+ {0x0A, "Bad Init Cookie"},
+ {0x0B, "Aggression Penalty"},
+ {0x0C, "Reserved"},
+ {0, NULL}
+};
+
+static const value_string dcp_feature_numbers_vals[] = {
+ {0x01, "CCID"},
+ {0x02, "Allow Short Seqnos"},
+ {0x03, "Sequence Window"},
+ {0x04, "ECN Incapable"},
+ {0x05, "Ack Ratio"},
+ {0x06, "Send Ack Vector"},
+ {0x07, "Send NDP Count"},
+ {0x08, "Minimum Checksum Coverage"},
+ {0x09, "Check Data Checksum"},
+ {0, NULL}
+};
+
+
+#if 0
+#define DBG(str, args...) do {\
+ fprintf(stdout, \
+ "[%s][%s][%d]: ",\
+ __FILE__, \
+ __FUNCTION__, \
+ __LINE__); \
+ fflush(stdout); \
+ fprintf(stdout, str, ## args); \
+ } while (0)
+#else
+#define DBG0(format)
+#define DBG1(format, arg1)
+#define DBG2(format, arg1, arg2)
+#endif /* 0/1 */
+
+
+static int proto_dcp = -1;
+static int dccp_tap = -1;
+
+static int hf_dcp_srcport = -1;
+static int hf_dcp_dstport = -1;
+static int hf_dcp_port = -1;
+static int hf_dcp_data_offset = -1;
+static int hf_dcp_ccval = -1;
+static int hf_dcp_cscov = -1;
+static int hf_dcp_checksum = -1;
+static int hf_dcp_checksum_bad = -1;
+static int hf_dcp_res1 = -1;
+static int hf_dcp_type = -1;
+static int hf_dcp_x = -1;
+static int hf_dcp_res2 = -1;
+static int hf_dcp_seq = -1;
+
+static int hf_dcp_ack_res = -1;
+static int hf_dcp_ack = -1;
+
+static int hf_dcp_service_code = -1;
+static int hf_dcp_reset_code = -1;
+static int hf_dcp_data1 = -1;
+static int hf_dcp_data2 = -1;
+static int hf_dcp_data3 = -1;
+
+static int hf_dcp_option_type = -1;
+static int hf_dcp_feature_number = -1;
+static int hf_dcp_ndp_count = -1;
+static int hf_dcp_timestamp = -1;
+static int hf_dcp_timestamp_echo = -1;
+static int hf_dcp_elapsed_time = -1;
+static int hf_dcp_data_checksum = -1;
+
+static int hf_dcp_malformed = -1;
+
+static gint ett_dcp = -1;
+static gint ett_dcp_options = -1;
+
+static dissector_table_t dcp_subdissector_table;
+static heur_dissector_list_t heur_subdissector_list;
+static dissector_handle_t data_handle;
+
+/* preferences */
+static gboolean dcp_summary_in_tree = TRUE;
+static gboolean try_heuristic_first = FALSE;
+static gboolean dccp_check_checksum = TRUE;
+
+
+void decode_dccp_ports(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, int sport, int dport)
+{
+ tvbuff_t *next_tvb;
+ int low_port, high_port;
+
+ next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+
+ /* determine if this packet is part of a conversation and call dissector */
+ /* for the conversation if available */
+
+ if (try_conversation_dissector(&pinfo->src, &pinfo->dst, PT_DCCP, sport, dport, next_tvb, pinfo, tree)) {
+ return;
+ }
+
+ if (try_heuristic_first) {
+ /* do lookup with the heuristic subdissector table */
+ if (dissector_try_heuristic(heur_subdissector_list, next_tvb, pinfo, tree)) {
+ return;
+ }
+ }
+
+ /* Do lookups with the subdissector table.
+ We try the port number with the lower value first, followed by the
+ port number with the higher value. This means that, for packets
+ where a dissector is registered for *both* port numbers:
+
+ 1) we pick the same dissector for traffic going in both directions;
+
+ 2) we prefer the port number that's more likely to be the right
+ one (as that prefers well-known ports to reserved ports);
+
+ although there is, of course, no guarantee that any such strategy
+ will always pick the right port number.
+ XXX - we ignore port numbers of 0, as some dissectors use a port
+ number of 0 to disable the port. */
+
+ if (sport > dport) {
+ low_port = dport;
+ high_port = sport;
+ } else {
+ low_port = sport;
+ high_port = dport;
+ }
+ if (low_port != 0 &&
+ dissector_try_port(dcp_subdissector_table, low_port, next_tvb, pinfo, tree)) {
+ return;
+ }
+ if (high_port != 0 &&
+ dissector_try_port(dcp_subdissector_table, high_port, next_tvb, pinfo, tree)) {
+ return;
+ }
+
+ if (!try_heuristic_first) {
+ /* do lookup with the heuristic subdissector table */
+ if (dissector_try_heuristic(heur_subdissector_list, next_tvb, pinfo, tree)) {
+ return;
+ }
+ }
+
+ /* Oh, well, we don't know this; dissect it as data. */
+ call_dissector(data_handle, next_tvb, pinfo, tree);
+}
+
+
+/*
+ * This function dissects DCCP options
+ */
+static void dissect_options(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *dcp_options_tree, proto_tree *tree _U_, e_dcphdr *dcph _U_,
+ int offset_start,
+ int offset_end)
+{
+ /* if here I'm sure there is at least offset_end - offset_start bytes in tvb and it should be options */
+ int offset=offset_start;
+ guint8 option_type = 0;
+ guint8 option_len = 0;
+ char buff[1024];
+ guint8 feature_number = 0;
+ int i;
+
+ while( offset < offset_end ) {
+
+ /* DBG("offset==%d\n", offset); */
+
+ /* first byte is the option type */
+ option_type = tvb_get_guint8(tvb, offset);
+ proto_tree_add_uint_hidden(dcp_options_tree, hf_dcp_option_type, tvb, offset, 1, option_type);
+
+ if (option_type >= 32) { /* variable length options */
+
+ if(!tvb_bytes_exist(tvb, offset, 1)) {
+ /* DBG("malformed\n"); */
+ proto_tree_add_boolean_hidden(dcp_options_tree, hf_dcp_malformed, tvb, offset, -1, TRUE);
+ return;
+ }
+
+ option_len = tvb_get_guint8(tvb, offset + 1);
+
+ if (option_len < 2) {
+ /* DBG("malformed\n"); */
+ proto_tree_add_boolean_hidden(dcp_options_tree, hf_dcp_malformed, tvb, offset, -1, TRUE);
+ return;
+ }
+
+ if(!tvb_bytes_exist(tvb, offset, option_len)) {
+ /* DBG("malformed\n"); */
+ proto_tree_add_boolean_hidden(dcp_options_tree, hf_dcp_malformed, tvb, offset, -1, TRUE);
+ return;
+ }
+
+ } else { /* 1byte options */
+ option_len = 1;
+ }
+
+ switch (option_type) {
+
+ case 0:
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, "Padding");
+ break;
+
+ case 1:
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, "Mandatory");
+ break;
+
+ case 2:
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, "Slow Receiver");
+ break;
+
+ case 32:
+ memset(buff, 0, sizeof(buff));
+ sprintf(buff, "Change L(");
+ feature_number = tvb_get_guint8(tvb, offset + 2);
+ proto_tree_add_uint_hidden(dcp_options_tree, hf_dcp_feature_number, tvb, offset + 2, 1, feature_number);
+
+ if( (feature_number < 10) && (feature_number!=0) ){
+ sprintf(buff, "%s%s ", buff, val_to_str(feature_number, dcp_feature_numbers_vals, "Unknown Type"));
+ for (i = 0; i < option_len - 3; i++)
+ sprintf(buff, "%s %d", buff, tvb_get_guint8(tvb, offset + 3 + i));
+ sprintf(buff, "%s)", buff);
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, buff);
+ } else {
+ if(((feature_number>=10)&&(feature_number<=127))||(feature_number==0))
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len,
+ "Change L (Reserved feature number)");
+ else
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len,
+ "Change L (CCID-specific features)");
+ }
+ break;
+
+ case 33:
+ memset(buff, 0, sizeof(buff));
+ sprintf(buff, "Confirm L(");
+ feature_number = tvb_get_guint8(tvb, offset + 2);
+ proto_tree_add_uint_hidden(dcp_options_tree, hf_dcp_feature_number, tvb, offset + 2, 1, feature_number);
+
+ if( (feature_number < 10) && (feature_number!=0) ){
+ sprintf(buff, "%s%s ", buff, val_to_str(feature_number, dcp_feature_numbers_vals, "Unknown Type"));
+ for (i = 0; i < option_len - 3; i++)
+ sprintf(buff, "%s %d", buff, tvb_get_guint8(tvb, offset + 3 + i));
+ sprintf(buff, "%s)", buff);
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, buff);
+ } else {
+ if(((feature_number>=10)&&(feature_number<=127))||(feature_number==0))
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len,
+ "Confirm L (Reserved feature number)");
+ else
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len,
+ "Confirm L (CCID-specific features)");
+ }
+ break;
+
+ case 34:
+ memset(buff, 0, sizeof(buff));
+ sprintf(buff, "Change R(");
+ feature_number = tvb_get_guint8(tvb, offset + 2);
+ proto_tree_add_uint_hidden(dcp_options_tree, hf_dcp_feature_number, tvb, offset + 2, 1, feature_number);
+
+ if( (feature_number < 10) && (feature_number!=0) ){
+ sprintf(buff, "%s%s ", buff, val_to_str(feature_number, dcp_feature_numbers_vals, "Unknown Type"));
+ for (i = 0; i < option_len - 3; i++)
+ sprintf(buff, "%s %d", buff, tvb_get_guint8(tvb, offset + 3 + i));
+ sprintf(buff, "%s)", buff);
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, buff);
+ } else {
+ if(((feature_number>=10)&&(feature_number<=127))||(feature_number==0))
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len,
+ "Change R (Reserved feature number)");
+ else
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len,
+ "Change R (CCID-specific features)");
+ }
+ break;
+
+ case 35:
+ memset(buff, 0, sizeof(buff));
+ sprintf(buff, "Confirm R(");
+ feature_number = tvb_get_guint8(tvb, offset + 2);
+ proto_tree_add_uint_hidden(dcp_options_tree, hf_dcp_feature_number, tvb, offset + 2, 1, feature_number);
+
+ if( (feature_number < 10) && (feature_number!=0) ){
+ sprintf(buff, "%s%s ", buff, val_to_str(feature_number, dcp_feature_numbers_vals, "Unknown Type"));
+ for (i = 0; i < option_len - 3; i++)
+ sprintf(buff, "%s %d", buff, tvb_get_guint8(tvb, offset + 3 + i));
+ sprintf(buff, "%s)", buff);
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, buff);
+ } else {
+ if(((feature_number>=10)&&(feature_number<=127))||(feature_number==0))
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len,
+ "Confirm R (Reserved feature number)");
+ else
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len,
+ "Confirm R (CCID-specific features)");
+ }
+ break;
+
+ case 36:
+ memset(buff, 0, sizeof(buff));
+ sprintf(buff, "Init Cookie(");
+ for (i = 0; i < option_len - 2; i++)
+ sprintf(buff, "%s%02x ", buff, tvb_get_guint8(tvb, offset + 2 + i));
+ sprintf(buff, "%s)", buff);
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, buff);
+ break;
+
+ case 37:
+ if(option_len==3)
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_ndp_count, tvb, offset + 2, 1,
+ tvb_get_guint8(tvb, offset + 2));
+ else if (option_len==4)
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_ndp_count, tvb, offset + 2, 2,
+ tvb_get_ntohs(tvb, offset + 2));
+ else if (option_len==5)
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_ndp_count, tvb, offset + 2, 3,
+ tvb_get_ntoh24(tvb, offset + 2));
+ else
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, "NDP Count too long (max 3 bytes)");
+
+ break;
+
+ case 38:
+ memset(buff, 0, sizeof(buff));
+ sprintf(buff, "Ack Vector0(");
+ for (i = 0; i < option_len - 2; i++)
+ sprintf(buff, "%s%02x ", buff, tvb_get_guint8(tvb, offset + 2 + i));
+ sprintf(buff, "%s)", buff);
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, buff);
+ break;
+
+ case 39:
+ memset(buff, 0, sizeof(buff));
+ sprintf(buff, "Ack Vector1(");
+ for (i = 0; i < option_len - 2; i++)
+ sprintf(buff, "%s%02x ", buff, tvb_get_guint8(tvb, offset + 2 + i));
+ sprintf(buff, "%s)", buff);
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, buff);
+ break;
+
+ case 40:
+ memset(buff, 0, sizeof(buff));
+ sprintf(buff, "Data Dropped(");
+ for (i = 0; i < option_len - 2; i++)
+ sprintf(buff, "%s%02x ", buff, tvb_get_guint8(tvb, offset + 2 + i));
+ sprintf(buff, "%s)", buff);
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, buff);
+ break;
+
+ case 41:
+ if(option_len==6)
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_timestamp, tvb, offset + 2, 4,
+ tvb_get_ntohl(tvb, offset + 2));
+ else
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len,
+ "Timestamp too long [%u != 6]", option_len);
+ break;
+
+ case 42:
+ if(option_len==6)
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_timestamp_echo, tvb, offset + 2, 4,
+ tvb_get_ntohl(tvb, offset + 2));
+ else if (option_len==8) {
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_timestamp_echo, tvb, offset + 2, 4,
+ tvb_get_ntohl(tvb, offset + 2));
+
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_elapsed_time, tvb, offset + 4, 2,
+ tvb_get_ntohs(tvb, offset + 4));
+ } else if (option_len==10) {
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_timestamp_echo, tvb, offset + 2, 4,
+ tvb_get_ntohl(tvb, offset + 2));
+
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_elapsed_time, tvb, offset + 4, 4,
+ tvb_get_ntohl(tvb, offset + 4));
+ } else
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, "Wrong Timestamp Echo length");
+ break;
+
+ case 43:
+ if(option_len==4)
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_elapsed_time, tvb, offset + 2, 2,
+ tvb_get_ntohs(tvb, offset + 2));
+ else if (option_len==6)
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_elapsed_time, tvb, offset + 2, 4,
+ tvb_get_ntohl(tvb, offset + 2));
+ else
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, "Wrong Elapsed Time length");
+ break;
+
+ case 44:
+ if(option_len==6) {
+ proto_tree_add_uint(dcp_options_tree, hf_dcp_data_checksum, tvb, offset + 2, 4,
+ tvb_get_ntohl(tvb, offset + 2));
+ } else
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, "Wrong Data checksum length");
+ break;
+
+ default :
+ if(((option_type >= 45) && (option_type <= 127)) ||
+ ((option_type >= 3) && (option_type <= 31))) {
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, "Reserved");
+ break;
+ }
+
+ if (option_type >= 128) {
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, "CCID option %d", option_type);
+ break;
+ }
+
+ /* if here we don't know this option */
+ proto_tree_add_text(dcp_options_tree, tvb, offset, option_len, "Unknown");
+ break;
+
+ } /* end switch() */
+
+ offset+=option_len; /* Skip over the dissected option */
+
+ } /* end while() */
+}
+
+static void dissect_dcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ proto_tree *dcp_tree = NULL;
+ proto_tree *dcp_options_tree = NULL;
+ proto_item *dcp_item = NULL;
+
+ vec_t cksum_vec[4];
+ guint32 phdr[2];
+ guint16 computed_cksum;
+ guint offset = 0;
+ guint len = 0;
+ guint reported_len = 0;
+ guint advertised_dccp_header_len = 0;
+ guint options_len = 0;
+ static e_dcphdr dcphstruct[4], *dcph;
+ static int dcph_count=0;
+
+ /* get at least a full message header */
+ if(!tvb_bytes_exist(tvb, 0, DCCP_HDR_LEN_MIN)) {
+ /* DBG("malformed\n"); */
+ if (tree)
+ proto_tree_add_boolean_hidden(dcp_tree, hf_dcp_malformed, tvb, offset, -1, TRUE);
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_add_fstr(pinfo->cinfo, COL_INFO, "Packet too short");
+ return;
+ }
+
+ dcph_count++;
+ if(dcph_count>=4) {
+ dcph_count=0;
+ }
+ dcph=&dcphstruct[dcph_count];
+ memset(dcph, 0, sizeof(struct _e_dcphdr));
+
+ SET_ADDRESS(&dcph->ip_src, pinfo->src.type, pinfo->src.len, pinfo->src.data);
+ SET_ADDRESS(&dcph->ip_dst, pinfo->dst.type, pinfo->dst.len, pinfo->dst.data);
+
+ if (check_col(pinfo->cinfo, COL_PROTOCOL))
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "DCCP");
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_clear(pinfo->cinfo, COL_INFO);
+
+ /* Extract generic header */
+ dcph->sport=tvb_get_ntohs(tvb, offset);
+ /* DBG("dcph->sport: %d\n", dcph->sport); */
+ dcph->dport=tvb_get_ntohs(tvb, offset+2);
+ /* DBG("dcph->dport: %d\n", dcph->dport); */
+
+ /* update pinfo structure. I guess I have to do it, because this is a transport protocol dissector. Right? */
+ pinfo->ptype=PT_DCCP;
+ pinfo->srcport=dcph->sport;
+ pinfo->destport=dcph->dport;
+
+ dcph->data_offset=tvb_get_guint8(tvb, offset+4);
+ /* DBG("dcph->data_offset: %d\n", dcph->data_offset); */
+ dcph->cscov=tvb_get_guint8(tvb, offset+5)&0x0F;
+ /* DBG("dcph->cscov: %d\n", dcph->cscov); */
+ dcph->ccval=tvb_get_guint8(tvb, offset+5)&0xF0;
+ /* DBG("dcph->ccval: %d\n", dcph->ccval); */
+ dcph->checksum=tvb_get_ntohs(tvb, offset+6);
+ /* DBG("dcph->checksum: %d\n", dcph->checksum); */
+ dcph->reserved1=tvb_get_guint8(tvb, offset+8)&0xE0;
+ dcph->reserved1>>=5;
+ /* DBG("dcph->reserved1: %d\n", dcph->reserved1); */
+ dcph->type=tvb_get_guint8(tvb, offset+8)&0x1E;
+ dcph->type>>=1;
+ /* DBG("dcph->type: %d\n", dcph->type); */
+ dcph->x=tvb_get_guint8(tvb, offset+8)&0x01;
+ /* DBG("dcph->x: %d\n", dcph->x); */
+ if(dcph->x) {
+ if(!tvb_bytes_exist(tvb, 0, DCCP_HDR_LEN)) { /* at least 16 bytes */
+ /* DBG("malformed\n"); */
+ proto_tree_add_boolean_hidden(dcp_tree, hf_dcp_malformed, tvb, offset, -1, TRUE);
+ return;
+ }
+ dcph->reserved2=tvb_get_guint8(tvb, offset+9);
+ /* DBG("dcph->reserved2: %u\n", dcph->reserved2); */
+ dcph->seq=tvb_get_ntohs(tvb, offset+10);
+ dcph->seq<<=32;
+ dcph->seq+=tvb_get_ntohl(tvb, offset+12);
+ /* DBG("dcph->seq[48bits]: %llu\n", dcph->seq); */
+ } else {
+ dcph->seq=tvb_get_guint8(tvb, offset+9);
+ dcph->seq<<=16;
+ dcph->seq+=tvb_get_ntohs(tvb, offset+10);
+ /* DBG("dcph->seq[24bits]: %llu\n", dcph->seq); */
+ }
+
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_add_fstr(pinfo->cinfo, COL_INFO, "%s > %s [%s] Seq=%" PRIu64,
+ get_dccp_port(dcph->sport),
+ get_dccp_port(dcph->dport),
+ val_to_str(dcph->type, dcp_packet_type_vals, "Unknown Type"),
+ dcph->seq);
+
+
+ if (tree) {
+ if(dcp_summary_in_tree) {
+ dcp_item =
+ proto_tree_add_protocol_format(tree, proto_dcp, tvb, offset, dcph->data_offset*4,
+ "Datagram Congestion Control Protocol, Src Port: %s (%u), Dst Port: %s (%u)"
+ " [%s] Seq=%" PRIu64,
+ get_dccp_port(dcph->sport), dcph->sport,
+ get_dccp_port(dcph->dport), dcph->dport,
+ val_to_str(dcph->type, dcp_packet_type_vals, "Unknown Type"),
+ dcph->seq);
+ } else {
+ dcp_item = proto_tree_add_item(tree, proto_dcp, tvb, offset, 8, FALSE);
+ }
+
+ dcp_tree = proto_item_add_subtree(dcp_item, ett_dcp);
+
+ proto_tree_add_uint_format(dcp_tree, hf_dcp_srcport, tvb, offset, 2, dcph->sport,
+ "Source port: %s (%u)", get_dccp_port(dcph->sport), dcph->sport);
+ proto_tree_add_uint_format(dcp_tree, hf_dcp_dstport, tvb, offset + 2, 2, dcph->dport,
+ "Destination port: %s (%u)", get_dccp_port(dcph->dport), dcph->dport);
+
+ proto_tree_add_uint_hidden(dcp_tree, hf_dcp_port, tvb, offset, 2, dcph->sport);
+ proto_tree_add_uint_hidden(dcp_tree, hf_dcp_port, tvb, offset + 2, 2, dcph->dport);
+
+ proto_tree_add_uint(dcp_tree, hf_dcp_data_offset, tvb, offset + 4, 1, dcph->data_offset);
+ proto_tree_add_uint(dcp_tree, hf_dcp_ccval, tvb, offset + 5, 1, dcph->ccval);
+ proto_tree_add_uint(dcp_tree, hf_dcp_cscov, tvb, offset + 5, 1, dcph->cscov);
+
+ /* checksum analisys taken from packet-udp */
+
+ reported_len = tvb_reported_length(tvb);
+ len = tvb_length(tvb);
+ if (dcph->checksum == 0) {
+ /* No checksum supplied in the packet */
+ proto_tree_add_uint_format(dcp_tree, hf_dcp_checksum, tvb,
+ offset + 6, 2, dcph->checksum, "Checksum: 0x%04x (none)", dcph->checksum);
+ } else if (!pinfo->fragmented && len >= reported_len) {
+
+ /* The packet isn't part of a fragmented datagram and isn't
+ truncated, so we can checksum it.
+ XXX - make a bigger scatter-gather list once we do fragment
+ reassembly? */
+
+ if (dccp_check_checksum) {
+
+ /* Set up the fields of the pseudo-header. */
+ cksum_vec[0].ptr = pinfo->src.data;
+ cksum_vec[0].len = pinfo->src.len;
+ cksum_vec[1].ptr = pinfo->dst.data;
+ cksum_vec[1].len = pinfo->dst.len;
+ cksum_vec[2].ptr = (const guint8 *)&phdr;
+ switch (pinfo->src.type) {
+
+ case AT_IPv4:
+ phdr[0] = g_htonl((IP_PROTO_DCCP<<16) + reported_len);
+ cksum_vec[2].len = 4;
+ break;
+ case AT_IPv6:
+ phdr[0] = g_htonl(reported_len);
+ phdr[1] = g_htonl(IP_PROTO_DCCP);
+ cksum_vec[2].len = 8;
+ break;
+
+ default:
+ /* DCCP runs only atop IPv4 and IPv6.... */
+ //DISSECTOR_ASSERT_NOT_REACHED();
+ break;
+ }
+ cksum_vec[3].ptr = tvb_get_ptr(tvb, offset, len);
+ cksum_vec[3].len = reported_len;
+ computed_cksum = in_cksum(&cksum_vec[0], 4);
+ if (computed_cksum == 0) {
+ proto_tree_add_uint_format(dcp_tree, hf_dcp_checksum, tvb,
+ offset + 6, 2, dcph->checksum,
+ "Checksum: 0x%04x [correct]", dcph->checksum);
+ } else {
+ proto_tree_add_boolean_hidden(dcp_tree, hf_dcp_checksum_bad, tvb, offset + 6, 2, TRUE);
+ proto_tree_add_uint_format(dcp_tree, hf_dcp_checksum, tvb, offset + 6, 2, dcph->checksum,
+ "Checksum: 0x%04x [incorrect, should be 0x%04x]", dcph->checksum,
+ in_cksum_shouldbe(dcph->checksum, computed_cksum));
+ }
+ } else {
+ proto_tree_add_uint_format(dcp_tree, hf_dcp_checksum, tvb,
+ offset + 6, 2, dcph->checksum, "Checksum: 0x%04x", dcph->checksum);
+ }
+ } else {
+ proto_tree_add_uint_format(dcp_tree, hf_dcp_checksum, tvb,
+ offset + 6, 2, dcph->checksum, "Checksum: 0x%04x", dcph->checksum);
+ }
+
+ proto_tree_add_uint_hidden(dcp_tree, hf_dcp_res1, tvb, offset + 8, 1, dcph->reserved1);
+ proto_tree_add_uint(dcp_tree, hf_dcp_type, tvb, offset + 8, 1, dcph->type);
+ proto_tree_add_boolean(dcp_tree, hf_dcp_x, tvb, offset + 8, 1, dcph->x);
+ if(dcph->x) {
+ proto_tree_add_uint_hidden(dcp_tree, hf_dcp_res2, tvb, offset + 9, 1, dcph->reserved2);
+ proto_tree_add_uint64(dcp_tree, hf_dcp_seq, tvb, offset + 10, 6, dcph->seq);
+ } else {
+ proto_tree_add_uint64(dcp_tree, hf_dcp_seq, tvb, offset + 9, 3, dcph->seq);
+
+ }
+ }
+
+ if(dcph->x)
+ offset+=16; /* Skip over extended Generic header */
+ else
+ offset+=12; /* Skip over not extended Generic header */
+
+ /* dissecting type depending additional fields */
+ switch(dcph->type) {
+
+ case 0x0: /* DCCP-Request */
+ if(!tvb_bytes_exist(tvb, offset, 4)) { /* at least 4 byte */
+ if(tree)
+ proto_tree_add_text(dcp_tree, tvb, offset, -1, "too short packet");
+ return;
+ }
+ dcph->service_code=tvb_get_ntohl(tvb, offset);
+ if(tree)
+ proto_tree_add_uint(dcp_tree, hf_dcp_service_code, tvb, offset, 4, dcph->service_code);
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_append_fstr(pinfo->cinfo, COL_INFO, " (service=%u)", dcph->service_code);
+
+ offset+=4; /* Skip over service code */
+ break;
+
+ case 0x1: /* DCCP-Response */
+ if(!tvb_bytes_exist(tvb, offset, 8)) { /* at least 8 byte */
+ if(tree)
+ proto_tree_add_text(dcp_tree, tvb, offset, -1, "too short packet");
+ return;
+ }
+ dcph->ack_reserved=tvb_get_ntohs(tvb, offset);
+ if(tree)
+ proto_tree_add_uint_hidden(dcp_tree, hf_dcp_ack_res, tvb, offset, 2, dcph->ack_reserved);
+ dcph->ack=tvb_get_ntohs(tvb, offset+2);
+ dcph->ack<<=32;
+ dcph->ack+=tvb_get_ntohl(tvb, offset+4);
+
+ if(tree)
+ proto_tree_add_uint64(dcp_tree, hf_dcp_ack, tvb, offset + 2, 6, dcph->ack);
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_append_fstr(pinfo->cinfo, COL_INFO, " (Ack=%" PRIu64 ")", dcph->ack);
+
+ offset+=8; /* Skip over Acknowledgement Number Subheader */
+
+ if(!tvb_bytes_exist(tvb, offset, 4)) { /* at least 4 byte */
+ if(tree)
+ proto_tree_add_text(dcp_tree, tvb, offset, -1, "too short packet");
+ return;
+ }
+ dcph->service_code=tvb_get_ntohl(tvb, offset);
+ if(tree)
+ proto_tree_add_uint(dcp_tree, hf_dcp_service_code, tvb, offset, 4, dcph->service_code);
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_append_fstr(pinfo->cinfo, COL_INFO, " (service=%u)", dcph->service_code);
+
+ offset+=4; /* Skip over service code */
+ break;
+
+ case 0x2: /* DCCP-Data */
+ /* nothing to dissect */
+ break;
+
+ case 0x3: /* DCCP-Ack */
+ case 0x4: /* DCCP-DataAck */
+ if(dcph->x) {
+ if(!tvb_bytes_exist(tvb, offset, 8)) { /* at least 8 byte */
+ if(tree)
+ proto_tree_add_text(dcp_tree, tvb, offset, -1, "too short packet");
+ return;
+ }
+ dcph->ack_reserved=tvb_get_ntohs(tvb, offset);
+ if(tree)
+ proto_tree_add_uint_hidden(dcp_tree, hf_dcp_ack_res, tvb, offset, 2, dcph->ack_reserved);
+ dcph->ack=tvb_get_ntohs(tvb, offset+2);
+ dcph->ack<<=32;
+ dcph->ack+=tvb_get_ntohl(tvb, offset+4);
+ if(tree)
+ proto_tree_add_uint64(dcp_tree, hf_dcp_ack, tvb, offset + 2, 6, dcph->ack);
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_append_fstr(pinfo->cinfo, COL_INFO, " (Ack=%" PRIu64 ")", dcph->ack);
+
+ offset+=8; /* Skip over Acknowledgement Number Subheader */
+ } else {
+ if(!tvb_bytes_exist(tvb, offset, 4)) { /* at least 4 byte */
+ if(tree)
+ proto_tree_add_text(dcp_tree, tvb, offset, -1, "too short packet");
+ return;
+ }
+ dcph->ack_reserved=tvb_get_guint8(tvb, offset);
+ if(tree)
+ proto_tree_add_uint_hidden(dcp_tree, hf_dcp_ack_res, tvb, offset, 1, dcph->ack_reserved);
+ dcph->ack=tvb_get_guint8(tvb, offset+1);
+ dcph->ack<<=16;
+ dcph->ack+=tvb_get_ntohs(tvb, offset+2);
+ if(tree)
+ proto_tree_add_uint64(dcp_tree, hf_dcp_ack, tvb, offset + 1, 3, dcph->ack);
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_append_fstr(pinfo->cinfo, COL_INFO, " (Ack=%" PRIu64 ")", dcph->ack);
+
+ offset+=4; /* Skip over Acknowledgement Number Subheader */
+ }
+ break;
+
+ case 0x7: /* DCCP-Reset */
+ if(!tvb_bytes_exist(tvb, offset, 8)) { /* at least 8 byte */
+ if(tree)
+ proto_tree_add_text(dcp_tree, tvb, offset, -1, "too short packet");
+ return;
+ }
+ dcph->ack_reserved=tvb_get_ntohs(tvb, offset);
+ if(tree)
+ proto_tree_add_uint_hidden(dcp_tree, hf_dcp_ack_res, tvb, offset, 2, dcph->ack_reserved);
+ dcph->ack=tvb_get_ntohs(tvb, offset+2);
+ dcph->ack<<=32;
+ dcph->ack+=tvb_get_ntohl(tvb, offset+4);
+ if(tree)
+ proto_tree_add_uint64(dcp_tree, hf_dcp_ack, tvb, offset + 2, 6, dcph->ack);
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_append_fstr(pinfo->cinfo, COL_INFO, " (Ack=%" PRIu64 ")", dcph->ack);
+
+ offset+=8; /* Skip over Acknowledgement Number Subheader */
+
+ dcph->reset_code=tvb_get_guint8(tvb, offset);
+ dcph->data1=tvb_get_guint8(tvb, offset+1);
+ dcph->data2=tvb_get_guint8(tvb, offset+2);
+ dcph->data3=tvb_get_guint8(tvb, offset+3);
+ if(tree) {
+ proto_tree_add_uint(dcp_tree, hf_dcp_reset_code, tvb, offset, 1, dcph->reset_code);
+ proto_tree_add_uint(dcp_tree, hf_dcp_data1, tvb, offset + 1, 1, dcph->data1);
+ proto_tree_add_uint(dcp_tree, hf_dcp_data2, tvb, offset + 2, 1, dcph->data2);
+ proto_tree_add_uint(dcp_tree, hf_dcp_data3, tvb, offset + 3, 1, dcph->data3);
+ }
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_append_fstr(pinfo->cinfo, COL_INFO, " (code=%s)", val_to_str(dcph->reset_code, dcp_reset_code_vals, "Unknown"));
+
+ offset+=4; /* Skip over Reset Code and data123 */
+ break;
+
+ case 0x5: /* DCCP-CloseReq */
+ case 0x6: /* DCCP-Close */
+ case 0x8: /* DCCP-Sync */
+ case 0x9: /* DCCP-SyncAck */
+ if(!tvb_bytes_exist(tvb, offset, 8)) { /* at least 8 byte */
+ if(tree)
+ proto_tree_add_text(dcp_tree, tvb, offset, -1, "too short packet");
+ return;
+ }
+ dcph->ack_reserved=tvb_get_ntohs(tvb, offset);
+ if(tree)
+ proto_tree_add_uint_hidden(dcp_tree, hf_dcp_ack_res, tvb, offset, 2, dcph->ack_reserved);
+ dcph->ack=tvb_get_ntohs(tvb, offset+2);
+ dcph->ack<<=32;
+ dcph->ack+=tvb_get_ntohl(tvb, offset+4);
+ if(tree)
+ proto_tree_add_uint64(dcp_tree, hf_dcp_ack, tvb, offset + 2, 6, dcph->ack);
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_append_fstr(pinfo->cinfo, COL_INFO, " (Ack=%" PRIu64 ")", dcph->ack);
+
+ offset+=8; /* Skip over Acknowledgement Number Subheader */
+ break;
+
+ default:
+ if(tree)
+ proto_tree_add_text(dcp_tree, tvb, offset, -1, "Reserved packet type: unable to dissect further");
+ return;
+ break;
+ }
+
+
+ /* note: data_offset is the offset from the start of the packet's DCCP header to the
+ * start of its application data area, in 32-bit words.
+ */
+
+ /* it's time to do some checks */
+ advertised_dccp_header_len = dcph->data_offset*4;
+ options_len = advertised_dccp_header_len - offset;
+
+ if ( advertised_dccp_header_len > DCCP_HDR_LEN_MAX ) {
+ if(tree)
+ proto_tree_add_text(dcp_tree, tvb, 4, 2,
+ "bogus data offset, advertised header length (%d) is larger than max (%d)",
+ advertised_dccp_header_len, DCCP_HDR_LEN_MAX);
+ return;
+ }
+
+ if(!tvb_bytes_exist(tvb, 0, advertised_dccp_header_len)) {
+ if(tree)
+ proto_tree_add_text(dcp_tree, tvb, offset, -1, "too short packet: missing %d bytes of DCCP header",
+ advertised_dccp_header_len - tvb_reported_length_remaining(tvb, offset));
+ return;
+ }
+
+ if(options_len > DCCP_OPT_LEN_MAX) {
+ /* DBG("malformed\n"); */
+ if(tree)
+ proto_tree_add_boolean_hidden(dcp_tree, hf_dcp_malformed, tvb, offset, -1, TRUE);
+ return;
+ }
+
+
+ /* Dissecting Options (if here we have at least (advertised_dccp_header_len - offset) bytes of options) */
+ if(advertised_dccp_header_len == offset) {
+ ; /* ok no options, no need to skip over */
+ } else if (advertised_dccp_header_len < offset) {
+ if(tree) {
+ proto_tree_add_text(dcp_tree, tvb, 4, 2,
+ "bogus data offset, advertised header length (%d) is shorter than expected",
+ advertised_dccp_header_len);
+ proto_tree_add_boolean_hidden(dcp_tree, hf_dcp_malformed, tvb, offset, -1, TRUE);
+ }
+ return;
+ } else {
+ if(tree) {
+ dcp_item = proto_tree_add_text(dcp_tree, tvb, offset, options_len, "Options: (%u bytes)", options_len);
+ dcp_options_tree = proto_item_add_subtree(dcp_item, ett_dcp_options);
+ dissect_options(tvb, pinfo, dcp_options_tree, tree, dcph, offset, offset + options_len);
+ }
+ }
+
+ offset+=options_len; /* Skip over Options */
+
+ /* Queuing tap data */
+ tap_queue_packet(dccp_tap, pinfo, dcph);
+
+ /* Call sub-dissectors */
+
+ if (!pinfo->in_error_pkt || tvb_length_remaining(tvb, offset) > 0)
+ decode_dccp_ports(tvb, offset, pinfo, tree, dcph->sport, dcph->dport);
+}
+
+
+void proto_register_dcp(void)
+{
+ module_t *dcp_module;
+
+ static hf_register_info hf[] = {
+ { &hf_dcp_srcport,
+ { "Source Port", "dcp.srcport", FT_UINT16, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_dstport,
+ { "Destination Port", "dcp.dstport", FT_UINT16, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_port,
+ { "Source or Destination Port", "dcp.port", FT_UINT16, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_data_offset,
+ { "Data Offset", "dcp.data_offset", FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_ccval,
+ { "CCVal", "dcp.ccval", FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_cscov,
+ { "Checksum Coverage", "dcp.cscov", FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_checksum_bad,
+ { "Bad Checksum", "dcp.checksum_bad", FT_BOOLEAN, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_checksum,
+ { "Checksum", "dcp.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_res1,
+ { "Reserved", "dcp.res1", FT_UINT8, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_res2,
+ { "Reserved", "dcp.res2", FT_UINT8, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_type,
+ { "Type", "dcp.type", FT_UINT8, BASE_DEC, VALS(dcp_packet_type_vals), 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_x,
+ { "Extended Sequence Numbers", "dcp.x", FT_BOOLEAN, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_seq,
+ { "Sequence Number", "dcp.seq", FT_UINT64, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_ack_res,
+ { "Reserved", "dcp.ack_res", FT_UINT16, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_ack,
+ { "Acknowledgement Number", "dcp.ack", FT_UINT64, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_service_code,
+ { "Service Code", "dcp.service_code", FT_UINT32, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_reset_code,
+ { "Reset Code", "dcp.reset_code", FT_UINT8, BASE_DEC, VALS(dcp_reset_code_vals), 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_data1,
+ { "Data 1", "dcp.data1", FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_data2,
+ { "Data 2", "dcp.data2", FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_data3,
+ { "Data 3", "dcp.data3", FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_option_type,
+ { "Option Type", "dcp.option_type", FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_feature_number,
+ { "Feature Number", "dcp.feature_number", FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_ndp_count,
+ { "NDP Count", "dcp.ndp_count", FT_UINT32, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_timestamp,
+ { "Timestamp", "dcp.timestamp", FT_UINT32, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_timestamp_echo,
+ { "Timestamp Echo", "dcp.timestamp_echo", FT_UINT32, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_elapsed_time,
+ { "Elapsed Time", "dcp.elapsed_time", FT_UINT32, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_data_checksum,
+ { "Data Checksum", "dcp.checksum_data", FT_UINT32, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_dcp_malformed,
+ { "", "dcp.malformed", FT_BOOLEAN, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ };
+
+ static gint *ett[] = {
+ &ett_dcp,
+ &ett_dcp_options,
+ };
+
+ proto_dcp = proto_register_protocol("Datagram Congestion Control Protocol", "DCP", "dcp");
+ proto_register_field_array(proto_dcp, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+ /* subdissectors */
+ dcp_subdissector_table = register_dissector_table("dcp.port", "DCP port", FT_UINT16, BASE_DEC);
+ register_heur_dissector_list("dcp", &heur_subdissector_list);
+
+ /* reg preferences */
+ dcp_module = prefs_register_protocol(proto_dcp, NULL);
+ prefs_register_bool_preference(dcp_module, "summary_in_tree",
+ "Show DCCP summary in protocol tree",
+ "Whether the DCCP summary line should be shown in the protocol tree",
+ &dcp_summary_in_tree);
+
+ prefs_register_bool_preference(dcp_module, "try_heuristic_first",
+ "Try heuristic sub-dissectors first",
+ "Try to decode a packet using an heuristic sub-dissector before using a sub-dissector "
+ "registered to a specific port",
+ &try_heuristic_first);
+
+ prefs_register_bool_preference(dcp_module, "check_checksum",
+ "Check the validity of the DCCP checksum when possible",
+ "Whether to check the validity of the DCCP checksum",
+ &dccp_check_checksum);
+}
+
+void proto_reg_handoff_dcp(void)
+{
+ dissector_handle_t dcp_handle;
+
+ dcp_handle = create_dissector_handle(dissect_dcp, proto_dcp);
+ dissector_add("ip.proto", IP_PROTO_DCCP, dcp_handle);
+ data_handle = find_dissector("data");
+ dccp_tap = register_tap("dccp");
+}
git.samba.org / obnox / wireshark / wip.git / commitdiff