/* packet-sctp.c * Routines for Stream Control Transmission Protocol dissection * Copyright 2000, Michael Tüxen * * $Id: packet-sctp.c,v 1.3 2000/08/07 03:21:09 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * Copied from README.developer * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, 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 License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #ifdef HAVE_SYS_TYPES_H # include #endif #ifdef HAVE_NETINET_IN_H # include #endif #ifdef NEED_SNPRINTF_H # ifdef HAVE_STDARG_H # include # else # include # endif # include "snprintf.h" #endif #include #include #include "packet.h" #include "packet-ip.h" /* Initialize the protocol and registered fields */ static int proto_sctp = -1; static int hf_sctp_source_port = -1; static int hf_sctp_destination_port = -1; static int hf_sctp_verification_tag = -1; static int hf_sctp_checksum = -1; static int hf_sctp_chunk_type = -1; static int hf_sctp_chunk_flags = -1; static int hf_sctp_chunk_length = -1; static int hf_sctp_init_chunk_initiate_tag = -1; static int hf_sctp_init_chunk_adv_rec_window_credit = -1; static int hf_sctp_init_chunk_number_of_outbound_streams = -1; static int hf_sctp_init_chunk_number_of_inbound_streams = -1; static int hf_sctp_init_chunk_initial_tsn = -1; static int hf_sctp_cumulative_tsn_ack = -1; static int hf_sctp_data_chunk_tsn = -1; static int hf_sctp_data_chunk_stream_id = -1; static int hf_sctp_data_chunk_stream_seq_number = -1; static int hf_sctp_data_chunk_payload_proto_id = -1; static int hf_sctp_data_chunk_e_bit = -1; static int hf_sctp_data_chunk_b_bit = -1; static int hf_sctp_data_chunk_u_bit = -1; static int hf_sctp_sack_chunk_cumulative_tsn_ack = -1; static int hf_sctp_sack_chunk_adv_rec_window_credit = -1; static int hf_sctp_sack_chunk_number_of_gap_blocks = -1; static int hf_sctp_sack_chunk_number_of_dup_tsns = -1; static int hf_sctp_sack_chunk_gap_block_start = -1; static int hf_sctp_sack_chunk_gap_block_end = -1; static int hf_sctp_sack_chunk_duplicate_tsn = -1; static int hf_sctp_shutdown_chunk_cumulative_tsn_ack = -1; static int hf_sctp_cwr_chunk_lowest_tsn = -1; static int hf_sctp_ecne_chunk_lowest_tsn = -1; static int hf_sctp_shutdown_complete_chunk_t_bit = -1; static int hf_sctp_chunk_parameter_type = -1; static int hf_sctp_chunk_parameter_length = -1; static int hf_sctp_parameter_ipv4_address = -1; static int hf_sctp_parameter_ipv6_address = -1; static int hf_sctp_parameter_cookie_preservative_increment = -1; static int hf_sctp_parameter_hostname_hostname = -1; static int hf_sctp_supported_address_types_parameter = -1; static int hf_sctp_cause_code = -1; static int hf_sctp_cause_length = -1; static int hf_sctp_cause_stream_identifier = -1; static int hf_sctp_cause_number_of_missing_parameters = -1; static int hf_sctp_cause_missing_parameter_type = -1; static int hf_sctp_cause_measure_of_staleness = -1; static int hf_sctp_cause_tsn = -1; /* Initialize the subtree pointers */ static gint ett_sctp = -1; static gint ett_sctp_chunk = -1; static gint ett_sctp_chunk_parameter = -1; static gint ett_sctp_chunk_cause = -1; static gint ett_sctp_data_chunk_flags = -1; static gint ett_sctp_sack_chunk_gap_block = -1; static gint ett_sctp_supported_address_types_parameter = -1; static gint ett_sctp_unrecognized_parameter_parameter = -1; #define SCTP_DATA_CHUNK_ID 0 #define SCTP_INIT_CHUNK_ID 1 #define SCTP_INIT_ACK_CHUNK_ID 2 #define SCTP_SACK_CHUNK_ID 3 #define SCTP_HEARTBEAT_CHUNK_ID 4 #define SCTP_HEARTBEAT_ACK_CHUNK_ID 5 #define SCTP_ABORT_CHUNK_ID 6 #define SCTP_SHUTDOWN_CHUNK_ID 7 #define SCTP_SHUTDOWN_ACK_CHUNK_ID 8 #define SCTP_ERROR_CHUNK_ID 9 #define SCTP_COOKIE_ECHO_CHUNK_ID 10 #define SCTP_COOKIE_ACK_CHUNK_ID 11 #define SCTP_ECNE_CHUNK_ID 12 #define SCTP_CWR_CHUNK_ID 13 #define SCTP_SHUTDOWN_COMPLETE_CHUNK_ID 14 #define SCTP_IETF_EXT 255 static const value_string sctp_chunk_type_values[] = { { SCTP_DATA_CHUNK_ID, "DATA" }, { SCTP_INIT_CHUNK_ID, "INIT" }, { SCTP_INIT_ACK_CHUNK_ID, "INIT ACK" }, { SCTP_SACK_CHUNK_ID, "SACK" }, { SCTP_HEARTBEAT_CHUNK_ID, "HEARTBEAT" }, { SCTP_HEARTBEAT_ACK_CHUNK_ID, "HEARTBEAT ACK" }, { SCTP_ABORT_CHUNK_ID, "ABORT" }, { SCTP_SHUTDOWN_CHUNK_ID, "SHUTDOWN" }, { SCTP_SHUTDOWN_ACK_CHUNK_ID, "SHUTDOWN ACK" }, { SCTP_ERROR_CHUNK_ID, "ERROR" }, { SCTP_COOKIE_ECHO_CHUNK_ID, "COOKIE ECHO" }, { SCTP_COOKIE_ACK_CHUNK_ID, "COOKIE ACK" }, { SCTP_ECNE_CHUNK_ID, "ECNE" }, { SCTP_CWR_CHUNK_ID, "CWR" }, { SCTP_SHUTDOWN_COMPLETE_CHUNK_ID, "SHUTDOWN COMPLETE" }, { SCTP_IETF_EXT, "IETF EXTENSION" }, { 0, NULL } }; #define HEARTBEAT_INFO_PARAMETER_ID 0x0001 #define IPV4ADDRESS_PARAMETER_ID 0x0005 #define IPV6ADDRESS_PARAMETER_ID 0x0006 #define STATE_COOKIE_PARAMETER_ID 0x0007 #define UNREC_PARA_PARAMETER_ID 0x0008 #define COOKIE_PRESERVATIVE_PARAMETER_ID 0x0009 #define HOSTNAME_ADDRESS_PARAMETER_ID 0x000b #define SUPPORTED_ADDRESS_TYPES_PARAMETER_ID 0x000c #define ECN_PARAMETER_ID 0x8000 static const value_string sctp_parameter_identifier_values[] = { { HEARTBEAT_INFO_PARAMETER_ID, "Heartbeat info" }, { IPV4ADDRESS_PARAMETER_ID, "IPv4 address" }, { IPV6ADDRESS_PARAMETER_ID, "IPv6 address" }, { STATE_COOKIE_PARAMETER_ID, "State cookie" }, { UNREC_PARA_PARAMETER_ID, "Unrecognized parameters" }, { COOKIE_PRESERVATIVE_PARAMETER_ID, "Cookie preservative" }, { HOSTNAME_ADDRESS_PARAMETER_ID, "Hostname address" }, { SUPPORTED_ADDRESS_TYPES_PARAMETER_ID, "Supported address types" }, { ECN_PARAMETER_ID, "ECN" }, { 0, NULL } }; #define PARAMETER_TYPE_LENGTH 2 #define PARAMETER_LENGTH_LENGTH 2 #define PARAMETER_HEADER_LENGTH (PARAMETER_TYPE_LENGTH + PARAMETER_LENGTH_LENGTH) #define PARAMETER_HEADER_OFFSET 0 #define PARAMETER_TYPE_OFFSET PARAMETER_HEADER_OFFSET #define PARAMETER_LENGTH_OFFSET (PARAMETER_TYPE_OFFSET + PARAMETER_TYPE_LENGTH) #define PARAMETER_VALUE_OFFSET (PARAMETER_LENGTH_OFFSET + PARAMETER_LENGTH_LENGTH) #define HEARTBEAT_INFO_PARAMETER_INFO_OFFSET PARAMETER_VALUE_OFFSET #define HEARTBEAT_INFO_PARAMETER_HEADER_LENGTH PARAMETER_HEADER_LENGTH #define IPV4_ADDRESS_LENGTH 4 #define IPV6_ADDRESS_LENGTH 16 #define STATE_COOKIE_PARAMETER_HEADER_LENGTH PARAMETER_HEADER_LENGTH #define STATE_COOKIE_PARAMETER_COOKIE_OFFSET PARAMETER_VALUE_OFFSET #define COOKIE_PRESERVATIVE_PARAMETER_INCR_OFFSET PARAMETER_VALUE_OFFSET #define COOKIE_PRESERVATIVE_PARAMETER_INCR_LENGTH 4 #define SUPPORTED_ADDRESS_TYPE_PARAMETER_ADDRESS_TYPE_LENGTH 2 #define CAUSE_CODE_LENGTH 2 #define CAUSE_LENGTH_LENGTH 2 #define CAUSE_HEADER_LENGTH (CAUSE_CODE_LENGTH + CAUSE_LENGTH_LENGTH) #define CAUSE_HEADER_OFFSET 0 #define CAUSE_CODE_OFFSET CAUSE_HEADER_OFFSET #define CAUSE_LENGTH_OFFSET (CAUSE_CODE_OFFSET + CAUSE_CODE_LENGTH) #define CAUSE_INFO_OFFSET (CAUSE_LENGTH_OFFSET + CAUSE_LENGTH_LENGTH) #define CAUSE_STREAM_IDENTIFIER_LENGTH 2 #define CAUSE_RESERVED_LENGTH 2 #define CAUSE_STREAM_IDENTIFIER_OFFSET CAUSE_INFO_OFFSET #define CAUSE_RESERVED_OFFSET (CAUSE_STREAM_IDENTIFIER_OFFSET + CAUSE_STREAM_IDENTIFIER_LENGTH) #define CAUSE_NUMBER_OF_MISSING_PARAMETERS_LENGTH 4 #define CAUSE_MISSING_PARAMETER_TYPE_LENGTH 2 #define CAUSE_NUMBER_OF_MISSING_PARAMETERS_OFFSET CAUSE_INFO_OFFSET #define CAUSE_FIRST_MISSING_PARAMETER_TYPE_OFFSET (CAUSE_NUMBER_OF_MISSING_PARAMETERS_OFFSET + \ CAUSE_NUMBER_OF_MISSING_PARAMETERS_LENGTH ) #define CAUSE_MEASURE_OF_STALENESS_LENGTH 4 #define CAUSE_MEASURE_OF_STALENESS_OFFSET CAUSE_INFO_OFFSET #define CAUSE_TSN_LENGTH 4 #define CAUSE_TSN_OFFSET CAUSE_INFO_OFFSET #define INVALID_STREAM_IDENTIFIER 0x01 #define MISSING_MANDATORY_PARAMETERS 0x02 #define STALE_COOKIE_ERROR 0x03 #define OUT_OF_RESOURCE 0x04 #define UNRESOLVABLE_ADDRESS 0x05 #define UNRECOGNIZED_CHUNK_TYPE 0x06 #define INVALID_MANDATORY_PARAMETER 0x07 #define UNRECOGNIZED_PARAMETERS 0x08 #define NO_USER_DATA 0x09 #define COOKIE_RECEIVED_WHILE_SHUTTING_DOWN 0x0a static const value_string sctp_cause_code_values[] = { { INVALID_STREAM_IDENTIFIER, "Invalid stream idetifier" }, { MISSING_MANDATORY_PARAMETERS, "Missing mandator parameter" }, { STALE_COOKIE_ERROR, "Stale cookie error" }, { OUT_OF_RESOURCE, "Out of resource" }, { UNRESOLVABLE_ADDRESS, "Unresolvable address" }, { UNRECOGNIZED_CHUNK_TYPE, "Unrecognized chunk type " }, { INVALID_MANDATORY_PARAMETER, "Invalid mandatory parameter" }, { UNRECOGNIZED_PARAMETERS, "Unrecognized parameters" }, { NO_USER_DATA, "No user data" }, { COOKIE_RECEIVED_WHILE_SHUTTING_DOWN, "Cookie received while shutting down" }, { 0, NULL } }; /* The structure of the common header is described by the following constants */ #define SOURCE_PORT_LENGTH 2 #define DESTINATION_PORT_LENGTH 2 #define VERIFICATION_TAG_LENGTH 4 #define CHECKSUM_LENGTH 4 #define COMMON_HEADER_LENGTH (SOURCE_PORT_LENGTH + \ DESTINATION_PORT_LENGTH + \ VERIFICATION_TAG_LENGTH + \ CHECKSUM_LENGTH) #define SOURCE_PORT_OFFSET 0 #define DESTINATION_PORT_OFFSET (SOURCE_PORT_OFFSET + SOURCE_PORT_LENGTH) #define VERIFICATION_TAG_OFFSET (DESTINATION_PORT_OFFSET + DESTINATION_PORT_LENGTH) #define CHECKSUM_OFFSET (VERIFICATION_TAG_OFFSET + VERIFICATION_TAG_LENGTH) /* The structure of the chunk header is described by the following constants */ #define CHUNK_TYPE_LENGTH 1 #define CHUNK_FLAGS_LENGTH 1 #define CHUNK_LENGTH_LENGTH 2 #define CHUNK_HEADER_LENGTH (CHUNK_TYPE_LENGTH + \ CHUNK_FLAGS_LENGTH + \ CHUNK_LENGTH_LENGTH) #define CHUNK_HEADER_OFFSET 0 #define CHUNK_TYPE_OFFSET CHUNK_HEADER_OFFSET #define CHUNK_FLAGS_OFFSET (CHUNK_TYPE_OFFSET + CHUNK_TYPE_LENGTH) #define CHUNK_LENGTH_OFFSET (CHUNK_FLAGS_OFFSET + CHUNK_FLAGS_LENGTH) #define CHUNK_VALUE_OFFSET (CHUNK_LENGTH_OFFSET + CHUNK_LENGTH_LENGTH) /* The following constants describe the structure of DATA chunks */ #define DATA_CHUNK_TSN_LENGTH 4 #define DATA_CHUNK_STREAM_ID_LENGTH 2 #define DATA_CHUNK_STREAM_SEQ_NUMBER_LENGTH 2 #define DATA_CHUNK_PAYLOAD_PROTOCOL_ID_LENGTH 4 #define DATA_CHUNK_TSN_OFFSET (CHUNK_VALUE_OFFSET + 0) #define DATA_CHUNK_STREAM_ID_OFFSET (DATA_CHUNK_TSN_OFFSET + DATA_CHUNK_TSN_LENGTH) #define DATA_CHUNK_STREAM_SEQ_NUMBER_OFFSET (DATA_CHUNK_STREAM_ID_OFFSET + \ DATA_CHUNK_STREAM_SEQ_NUMBER_LENGTH) #define DATA_CHUNK_PAYLOAD_PROTOCOL_ID_OFFSET (DATA_CHUNK_STREAM_SEQ_NUMBER_OFFSET + \ DATA_CHUNK_STREAM_SEQ_NUMBER_LENGTH) #define DATA_CHUNK_PAYLOAD_OFFSET (DATA_CHUNK_PAYLOAD_PROTOCOL_ID_OFFSET + \ DATA_CHUNK_PAYLOAD_PROTOCOL_ID_LENGTH) #define DATA_CHUNK_HEADER_LENGTH (CHUNK_HEADER_LENGTH + \ DATA_CHUNK_TSN_LENGTH + \ DATA_CHUNK_STREAM_ID_LENGTH + \ DATA_CHUNK_STREAM_SEQ_NUMBER_LENGTH + \ DATA_CHUNK_PAYLOAD_PROTOCOL_ID_LENGTH) #define SCTP_DATA_CHUNK_E_BIT 0x01 #define SCTP_DATA_CHUNK_B_BIT 0x02 #define SCTP_DATA_CHUNK_U_BIT 0x04 #define INIT_CHUNK_INITIATE_TAG_LENGTH 4 #define INIT_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH 4 #define INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_LENGTH 2 #define INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_LENGTH 2 #define INIT_CHUNK_INITIAL_TSN_LENGTH 4 #define INIT_CHUNK_INITIATE_TAG_OFFSET CHUNK_VALUE_OFFSET #define INIT_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET (INIT_CHUNK_INITIATE_TAG_OFFSET + \ INIT_CHUNK_INITIATE_TAG_LENGTH ) #define INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_OFFSET (INIT_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET + \ INIT_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH ) #define INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_OFFSET (INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_OFFSET + \ INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_LENGTH ) #define INIT_CHUNK_INITIAL_TSN_OFFSET (INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_OFFSET + \ INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_LENGTH ) #define INIT_CHUNK_VARIABLE_LENGTH_PARAMETER_OFFSET (INIT_CHUNK_INITIAL_TSN_OFFSET + \ INIT_CHUNK_INITIAL_TSN_LENGTH ) #define SACK_CHUNK_CUMULATIVE_TSN_ACK_LENGTH 4 #define SACK_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH 4 #define SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_LENGTH 2 #define SACK_CHUNK_NUMBER_OF_DUP_TSNS_LENGTH 2 #define SACK_CHUNK_GAP_BLOCK_LENGTH 4 #define SACK_CHUNK_GAP_BLOCK_START_LENGTH 2 #define SACK_CHUNK_GAP_BLOCK_END_LENGTH 2 #define SACK_CHUNK_DUP_TSN_LENGTH 4 #define SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET (CHUNK_VALUE_OFFSET + 0) #define SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET (SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET + \ SACK_CHUNK_CUMULATIVE_TSN_ACK_LENGTH) #define SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET (SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET + \ SACK_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH) #define SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET (SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET + \ SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_LENGTH) #define SACK_CHUNK_GAP_BLOCK_OFFSET (SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET + \ SACK_CHUNK_NUMBER_OF_DUP_TSNS_LENGTH) #define HEARTBEAT_CHUNK_INFO_OFFSET CHUNK_VALUE_OFFSET #define SHUTDOWN_CHUNK_CUMULATIVE_TSN_ACK_OFFSET CHUNK_VALUE_OFFSET #define SHUTDOWN_CHUNK_CUMULATIVE_TSN_ACK_LENGTH 4 #define ABORT_CHUNK_FIRST_ERROR_CAUSE_OFFSET 4 #define ERROR_CHUNK_FIRST_ERROR_CAUSE_OFFSET 4 #define COOKIE_ECHO_CHUNK_COOKIE_OFFSET CHUNK_VALUE_OFFSET #define ECNE_CHUNK_LOWEST_TSN_OFFSET CHUNK_VALUE_OFFSET #define ECNE_CHUNK_LOWEST_TSN_LENGTH 4 #define CWR_CHUNK_LOWEST_TSN_OFFSET CHUNK_VALUE_OFFSET #define CWR_CHUNK_LOWEST_TSN_LENGTH 4 #define SCTP_SHUTDOWN_COMPLETE_CHUNK_T_BIT 0x01 static const true_false_string sctp_data_chunk_e_bit_value = { "Last segment", "Not the last segment" }; static const true_false_string sctp_data_chunk_b_bit_value = { "First segment", "Subsequent segment" }; static const true_false_string sctp_data_chunk_u_bit_value = { "Unordered delivery", "Ordered deliviery" }; static const true_false_string sctp_shutdown_complete_chunk_t_bit_value = { "No TCB destroyed", "TCB destroyed" }; /* adler32.c -- compute the Adler-32 checksum of a data stream * Copyright (C) 1995-1996 Mark Adler * For conditions of distribution and use, see copyright notice in zlib.h * available, e.g. from http://www.cdrom.com/pub/infozip/zlib/ * * It was modified for the use in this dissector. */ #define BASE 65521L /* largest prime smaller than 65536 */ #define NMAX 5540 /* NMAX is the largest n - 12 such that */ /* 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */ #define DO1(buf,i) {s1 += buf[i]; s2 += s1;} #define DO2(buf,i) DO1(buf,i); DO1(buf,i+1); #define DO4(buf,i) DO2(buf,i); DO2(buf,i+2); #define DO8(buf,i) DO4(buf,i); DO4(buf,i+4); #define DO16(buf) DO8(buf,0); DO8(buf,8); unsigned int sctp_adler_32(const unsigned char* buf, unsigned int len) { unsigned int s1 = 1L; unsigned int s2 = 0L; int k; /* handle the first 8 bytes of the datagram */ DO8(buf,0); buf += SOURCE_PORT_LENGTH + DESTINATION_PORT_LENGTH + VERIFICATION_TAG_LENGTH; /* handle four 0 bytes as checksum */ s2 += CHECKSUM_LENGTH * s1; buf += CHECKSUM_LENGTH; /* now we have 12 bytes handled */ len -= COMMON_HEADER_LENGTH; /* handle the rest of the datagram */ while (len > 0) { k = len < NMAX ? len : NMAX; len -= k; while (k >= 16) { DO16(buf); buf += 16; k -= 16; } if (k != 0) do { s1 += *buf++; s2 += s1; } while (--k); s1 %= BASE; s2 %= BASE; } return (s2 << 16) | s1; } static char *sctp_checksum_state(tvbuff_t *tvb, guint orig_checksum) { guint length; length = tvb_length(tvb); if (orig_checksum == sctp_adler_32(tvb_get_ptr(tvb, 0, length), length)) return "correct"; else return "incorrect"; } guint nr_of_padding_bytes (guint length) { guint remainder; remainder = length % 4; if (remainder == 0) return 0; else return 4 - remainder; } /* * TLV parameter stuff for INIT and INIT-ACK chunks */ void dissect_parameter(tvbuff_t *, proto_tree *); void dissect_sctp_chunk(tvbuff_t *, proto_tree *); void dissect_tlv_parameter_list(tvbuff_t *parameter_list_tvb, proto_tree *tree) { guint offset, length, padding_length, total_length; tvbuff_t *parameter_tvb; offset = 0; while(tvb_length_remaining(parameter_list_tvb, offset)) { length = tvb_get_ntohs(parameter_list_tvb, offset + PARAMETER_LENGTH_OFFSET); padding_length = nr_of_padding_bytes(length); total_length = length + padding_length; /* create a tvb for the chunk including the padding bytes */ parameter_tvb = tvb_new_subset(parameter_list_tvb, offset, total_length, total_length); dissect_parameter(parameter_tvb, tree); /* get rid of the handled parameter */ offset += total_length; } } void dissect_heartbeat_info_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 length, heartbeat_info_length; length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); heartbeat_info_length = length - HEARTBEAT_INFO_PARAMETER_HEADER_LENGTH; proto_tree_add_text(parameter_tree, parameter_tvb, HEARTBEAT_INFO_PARAMETER_INFO_OFFSET, heartbeat_info_length, "Heartbeat info (%u byte%s)", heartbeat_info_length, plurality(heartbeat_info_length, "", "s")); proto_item_set_text(parameter_item, "Heartbeat info parameter with %u byte%s of info", heartbeat_info_length, plurality(heartbeat_info_length, "", "s")); } void dissect_ipv4_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { guint32 ipv4_address; tvb_memcpy(parameter_tvb, (guint8 *)&ipv4_address, PARAMETER_VALUE_OFFSET, IPV4_ADDRESS_LENGTH); proto_tree_add_ipv4(parameter_tree, hf_sctp_parameter_ipv4_address, parameter_tvb, PARAMETER_VALUE_OFFSET, IPV4_ADDRESS_LENGTH, ipv4_address); proto_item_set_text(parameter_item, "IPV4 address parameter"); } void dissect_ipv6_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { proto_tree_add_ipv6(parameter_tree, hf_sctp_parameter_ipv6_address, parameter_tvb, PARAMETER_VALUE_OFFSET, IPV6_ADDRESS_LENGTH, tvb_get_ptr(parameter_tvb, PARAMETER_VALUE_OFFSET, IPV6_ADDRESS_LENGTH)); proto_item_set_text(parameter_item, "IPV6 address parameter"); } void dissect_state_cookie_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 length, state_cookie_length; length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); state_cookie_length = length - STATE_COOKIE_PARAMETER_HEADER_LENGTH; proto_tree_add_text(parameter_tree, parameter_tvb, STATE_COOKIE_PARAMETER_COOKIE_OFFSET, state_cookie_length, "State cookie (%u byte%s)", state_cookie_length, plurality(state_cookie_length, "", "s")); proto_item_set_text(parameter_item, "State Cookie Parameter with %u byte%s cookie", state_cookie_length, plurality(state_cookie_length, "", "s")); } void dissect_unrecognized_parameters_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 length, parameter_value_length; tvbuff_t *unrecognized_parameters_tvb; length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); parameter_value_length = length - PARAMETER_HEADER_LENGTH; unrecognized_parameters_tvb = tvb_new_subset(parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, parameter_value_length); dissect_tlv_parameter_list(unrecognized_parameters_tvb, parameter_tree); proto_item_set_text(parameter_item, "Unrecognized parameter of type"); } void dissect_cookie_preservative_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { guint32 increment; increment = tvb_get_ntohl(parameter_tvb, COOKIE_PRESERVATIVE_PARAMETER_INCR_OFFSET); proto_tree_add_uint(parameter_tree, hf_sctp_parameter_cookie_preservative_increment, parameter_tvb, COOKIE_PRESERVATIVE_PARAMETER_INCR_OFFSET, COOKIE_PRESERVATIVE_PARAMETER_INCR_LENGTH, increment); proto_item_set_text(parameter_item, "Cookie preservative parameter requesting for a %u msec increment", increment); } void dissect_hostname_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 length, hostname_length; char *hostname; length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); hostname_length = length - PARAMETER_HEADER_LENGTH; hostname = (char *)tvb_get_ptr(parameter_tvb, PARAMETER_VALUE_OFFSET, hostname_length); proto_tree_add_string(parameter_tree, hf_sctp_parameter_hostname_hostname, parameter_tvb, PARAMETER_VALUE_OFFSET, hostname_length, hostname); proto_item_set_text(parameter_item, "Hostname parameter"); } void dissect_supported_address_types_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 length, address_type, number_of_address_types, address_type_number, list_of_address_types_length ; guint offset; proto_item *address_list_item; proto_tree *address_list_tree; length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); list_of_address_types_length = length - PARAMETER_HEADER_LENGTH; number_of_address_types = list_of_address_types_length / SUPPORTED_ADDRESS_TYPE_PARAMETER_ADDRESS_TYPE_LENGTH; address_list_item = proto_tree_add_text(parameter_tree, parameter_tvb, PARAMETER_VALUE_OFFSET, list_of_address_types_length, "Supported Address Types (%u address type%s)", number_of_address_types, plurality(number_of_address_types, "", "s")); address_list_tree = proto_item_add_subtree(address_list_item, ett_sctp_supported_address_types_parameter); offset = PARAMETER_VALUE_OFFSET; for(address_type_number = 1; address_type_number <= number_of_address_types; address_type_number++) { address_type = tvb_get_ntohs(parameter_tvb, offset); proto_tree_add_uint_format(address_list_tree, hf_sctp_supported_address_types_parameter, parameter_tvb, offset, SUPPORTED_ADDRESS_TYPE_PARAMETER_ADDRESS_TYPE_LENGTH, address_type, "Supported address type: %u (%s)", address_type, val_to_str(address_type, sctp_parameter_identifier_values, "unknown")); offset += SUPPORTED_ADDRESS_TYPE_PARAMETER_ADDRESS_TYPE_LENGTH; }; proto_item_set_text(parameter_item, "Supported address types parameter reporting %u address type%s", number_of_address_types, plurality(number_of_address_types, "", "s")); } void dissect_ecn_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { proto_item_set_text(parameter_item, "ECN parameter"); } void dissect_unknown_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 type, length, parameter_value_length; type = tvb_get_ntohs(parameter_tvb, PARAMETER_TYPE_OFFSET); length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); parameter_value_length = length - PARAMETER_HEADER_LENGTH; proto_tree_add_text(parameter_tree, parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, "Parameter value (%u byte%s)", parameter_value_length, plurality(parameter_value_length, "", "s")); proto_item_set_text(parameter_item, "Parameter of type %u and %u byte%s value", type, parameter_value_length, plurality(parameter_value_length, "", "s")); } void dissect_parameter(tvbuff_t *parameter_tvb, proto_tree *chunk_tree) { guint16 type, length, padding_length, total_length; proto_item *parameter_item; proto_tree *parameter_tree; type = tvb_get_ntohs(parameter_tvb, PARAMETER_TYPE_OFFSET); length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); padding_length = nr_of_padding_bytes(length); total_length = length + padding_length; parameter_item = proto_tree_add_notext(chunk_tree, parameter_tvb, PARAMETER_HEADER_OFFSET, total_length); parameter_tree = proto_item_add_subtree(parameter_item, ett_sctp_chunk_parameter); proto_tree_add_uint_format(parameter_tree, hf_sctp_chunk_parameter_type, parameter_tvb, PARAMETER_TYPE_OFFSET, PARAMETER_TYPE_LENGTH, type, "Parameter type: %u (%s)", type, val_to_str(type, sctp_parameter_identifier_values, "unknown")); proto_tree_add_uint(parameter_tree, hf_sctp_chunk_parameter_length, parameter_tvb, PARAMETER_LENGTH_OFFSET, PARAMETER_LENGTH_LENGTH, length); switch(type) { case HEARTBEAT_INFO_PARAMETER_ID: dissect_heartbeat_info_parameter(parameter_tvb, parameter_tree, parameter_item); break; case IPV4ADDRESS_PARAMETER_ID: dissect_ipv4_parameter(parameter_tvb, parameter_tree, parameter_item); break; case IPV6ADDRESS_PARAMETER_ID: dissect_ipv6_parameter(parameter_tvb, parameter_tree, parameter_item); break; case STATE_COOKIE_PARAMETER_ID: dissect_state_cookie_parameter(parameter_tvb, parameter_tree, parameter_item); break; case UNREC_PARA_PARAMETER_ID: dissect_unrecognized_parameters_parameter(parameter_tvb, parameter_tree, parameter_item); break; case COOKIE_PRESERVATIVE_PARAMETER_ID: dissect_cookie_preservative_parameter(parameter_tvb, parameter_tree, parameter_item); break; case HOSTNAME_ADDRESS_PARAMETER_ID: dissect_hostname_parameter(parameter_tvb, parameter_tree, parameter_item); break; case SUPPORTED_ADDRESS_TYPES_PARAMETER_ID: dissect_supported_address_types_parameter(parameter_tvb, parameter_tree, parameter_item); break; case ECN_PARAMETER_ID: dissect_ecn_parameter(parameter_tvb, parameter_tree, parameter_item); break; default: dissect_unknown_parameter(parameter_tvb, parameter_tree, parameter_item); break; }; if (padding_length > 0) proto_tree_add_text(parameter_tree, parameter_tvb, PARAMETER_HEADER_OFFSET + length, padding_length, "Padding: %u byte%s", padding_length, plurality(padding_length, "", "s")); } /* * Code to handle error causes for ABORT and ERROR chunks */ void dissect_invalid_stream_identifier_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item) { guint16 stream_identifier; stream_identifier = tvb_get_ntohs(cause_tvb, CAUSE_STREAM_IDENTIFIER_OFFSET); proto_tree_add_uint(cause_tree, hf_sctp_cause_stream_identifier, cause_tvb, CAUSE_STREAM_IDENTIFIER_OFFSET, CAUSE_STREAM_IDENTIFIER_LENGTH, stream_identifier); proto_tree_add_text(cause_tree, cause_tvb, CAUSE_RESERVED_OFFSET, CAUSE_RESERVED_LENGTH, "Reserved (2 bytes)"); proto_item_set_text(cause_item, "Error cause reporting invalid stream identifier %u", stream_identifier); } void dissect_missing_mandatory_parameters_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item) { guint32 number_of_missing_parameters, missing_parameter_number; guint16 parameter_type; guint offset; number_of_missing_parameters = tvb_get_ntohl(cause_tvb, CAUSE_NUMBER_OF_MISSING_PARAMETERS_OFFSET); proto_tree_add_uint(cause_tree, hf_sctp_cause_number_of_missing_parameters, cause_tvb, CAUSE_NUMBER_OF_MISSING_PARAMETERS_OFFSET, CAUSE_NUMBER_OF_MISSING_PARAMETERS_LENGTH, number_of_missing_parameters); offset = CAUSE_FIRST_MISSING_PARAMETER_TYPE_OFFSET; for(missing_parameter_number = 1; missing_parameter_number <= number_of_missing_parameters; missing_parameter_number++) { parameter_type = tvb_get_ntohs(cause_tvb, offset); proto_tree_add_uint_format(cause_tree, hf_sctp_cause_missing_parameter_type, cause_tvb, offset, CAUSE_MISSING_PARAMETER_TYPE_LENGTH, parameter_type, "Missing parameter type: %u (%s)", parameter_type, val_to_str(parameter_type, sctp_parameter_identifier_values, "unknown")); offset += CAUSE_MISSING_PARAMETER_TYPE_LENGTH; }; proto_item_set_text(cause_item, "Error cause reporting %u missing mandatory parameter%s", number_of_missing_parameters, plurality(number_of_missing_parameters, "", "s") ); } void dissect_stale_cookie_error_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item) { guint32 measure_of_staleness; measure_of_staleness = tvb_get_ntohl(cause_tvb, CAUSE_MEASURE_OF_STALENESS_OFFSET); proto_tree_add_uint(cause_tree, hf_sctp_cause_measure_of_staleness, cause_tvb, CAUSE_MEASURE_OF_STALENESS_OFFSET, CAUSE_MEASURE_OF_STALENESS_LENGTH, measure_of_staleness); proto_item_set_text(cause_item, "Error cause reporting a measure of staleness of %u usec", measure_of_staleness); } void dissect_out_of_resource_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item) { proto_item_set_text(cause_item, "Error cause reporting lack of resources"); } void dissect_unresolvable_address_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item) { guint16 code, length, parameter_length, parameter_type; tvbuff_t *parameter_tvb; code = tvb_get_ntohs(cause_tvb, CAUSE_CODE_OFFSET); length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET); parameter_length = length - CAUSE_HEADER_LENGTH; parameter_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, parameter_length, parameter_length); dissect_parameter(parameter_tvb, cause_tree); parameter_type = tvb_get_ntohs(parameter_tvb, PARAMETER_TYPE_OFFSET); proto_item_set_text(cause_item, "Error cause reporting unresolvable address of type %u (%s)", parameter_type, val_to_str(parameter_type, sctp_parameter_identifier_values, "unknown") ); } void dissect_unrecognized_chunk_type_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item) { guint16 length, chunk_length; guint8 unrecognized_type; tvbuff_t *unrecognized_chunk_tvb; length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET); chunk_length = length - CAUSE_HEADER_LENGTH; unrecognized_chunk_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, chunk_length, chunk_length); dissect_sctp_chunk(unrecognized_chunk_tvb, cause_tree); unrecognized_type = tvb_get_guint8(unrecognized_chunk_tvb, CHUNK_TYPE_OFFSET); proto_item_set_text(cause_item, "Error cause reporting unrecognized chunk of type %u (%s)", unrecognized_type, val_to_str(unrecognized_type, sctp_chunk_type_values, "unknown")); } void dissect_invalid_mandatory_parameter_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item) { proto_item_set_text(cause_item, "Error cause reporting an invalid mandatory parameter"); } void dissect_unrecognized_parameters_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item) { guint16 length, cause_info_length; tvbuff_t *unrecognized_parameters_tvb; length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET); cause_info_length = length - CAUSE_HEADER_LENGTH; unrecognized_parameters_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, cause_info_length); dissect_tlv_parameter_list(unrecognized_parameters_tvb, cause_tree); proto_item_set_text(cause_item, "Error cause reporting unrecognized parameters"); } void dissect_no_user_data_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item) { guint32 tsn; tsn = tvb_get_ntohl(cause_tvb, CAUSE_TSN_OFFSET); proto_tree_add_uint(cause_tree, hf_sctp_cause_tsn, cause_tvb, CAUSE_TSN_OFFSET, CAUSE_TSN_LENGTH, tsn); proto_item_set_text(cause_item, "Error cause reporting data chunk with TSN %u contains no data", tsn); } void dissect_cookie_received_while_shutting_down_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item) { proto_item_set_text(cause_item, "Error cause reporting cookie reception while shutting down"); } void dissect_unknown_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item) { guint16 code, length, cause_info_length; code = tvb_get_ntohs(cause_tvb, CAUSE_CODE_OFFSET); length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET); cause_info_length = length - CAUSE_HEADER_LENGTH; proto_tree_add_text(cause_tree, cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, "Cause specific information (%u byte%s)", cause_info_length, plurality(cause_info_length, "", "s")); proto_item_set_text(cause_item, "Error cause with code %u and %u byte%s information", code, cause_info_length, plurality(cause_info_length, "", "s")); } void dissect_error_cause(tvbuff_t *cause_tvb, proto_tree *chunk_tree) { guint16 code, length, padding_length, total_length; proto_item *cause_item; proto_tree *cause_tree; code = tvb_get_ntohs(cause_tvb, CAUSE_CODE_OFFSET); length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET); padding_length = nr_of_padding_bytes(length); total_length = length + padding_length; cause_item = proto_tree_add_notext(chunk_tree, cause_tvb, CAUSE_HEADER_OFFSET, total_length); proto_item_set_text(cause_item, "BAD ERROR CAUSE"); cause_tree = proto_item_add_subtree(cause_item, ett_sctp_chunk_cause); proto_tree_add_uint_format(cause_tree, hf_sctp_cause_code, cause_tvb, CAUSE_CODE_OFFSET, CAUSE_CODE_LENGTH, code, "Cause code: %u (%s)", code, val_to_str(code, sctp_cause_code_values, "unknown")); proto_tree_add_uint(cause_tree, hf_sctp_cause_length, cause_tvb, CAUSE_LENGTH_OFFSET, CAUSE_LENGTH_LENGTH, length); switch(code) { case INVALID_STREAM_IDENTIFIER: dissect_invalid_stream_identifier_cause(cause_tvb, cause_tree, cause_item); break; case MISSING_MANDATORY_PARAMETERS: dissect_missing_mandatory_parameters_cause(cause_tvb, cause_tree, cause_item); break; case STALE_COOKIE_ERROR: dissect_stale_cookie_error_cause(cause_tvb, cause_tree, cause_item); break; case OUT_OF_RESOURCE: dissect_out_of_resource_cause(cause_tvb, cause_tree, cause_item); break; case UNRESOLVABLE_ADDRESS: dissect_unresolvable_address_cause(cause_tvb, cause_tree, cause_item); break; case UNRECOGNIZED_CHUNK_TYPE: dissect_unrecognized_chunk_type_cause(cause_tvb, cause_tree, cause_item); break; case INVALID_MANDATORY_PARAMETER: dissect_invalid_mandatory_parameter_cause(cause_tvb, cause_tree, cause_item); break; case UNRECOGNIZED_PARAMETERS: dissect_unrecognized_parameters_cause(cause_tvb, cause_tree, cause_item); break; case NO_USER_DATA: dissect_no_user_data_cause(cause_tvb, cause_tree, cause_item); break; case COOKIE_RECEIVED_WHILE_SHUTTING_DOWN: dissect_cookie_received_while_shutting_down_cause(cause_tvb, cause_tree, cause_item); break; default: dissect_unknown_cause(cause_tvb, cause_tree, cause_item); break; }; if (padding_length > 0) proto_tree_add_text(cause_tree, cause_tvb, CAUSE_HEADER_OFFSET + length, padding_length, "Padding: %u byte%s", padding_length, plurality(padding_length, "", "s")); } /* * Code to actually dissect the packets */ static void dissect_data_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint8 flags; guint16 length, payload_length, padding_length, stream_id, stream_seq_number; guint32 tsn, payload_proto_id; proto_tree *flag_tree; flags = tvb_get_guint8(chunk_tvb, CHUNK_FLAGS_OFFSET); length = tvb_get_ntohs(chunk_tvb, CHUNK_LENGTH_OFFSET); flag_tree = proto_item_add_subtree(flags_item, ett_sctp_data_chunk_flags); proto_tree_add_boolean(flag_tree, hf_sctp_data_chunk_e_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, flags); proto_tree_add_boolean(flag_tree, hf_sctp_data_chunk_b_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, flags); proto_tree_add_boolean(flag_tree, hf_sctp_data_chunk_u_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, flags); tsn = tvb_get_ntohl(chunk_tvb, DATA_CHUNK_TSN_OFFSET); stream_id = tvb_get_ntohs(chunk_tvb, DATA_CHUNK_STREAM_ID_OFFSET); stream_seq_number = tvb_get_ntohs(chunk_tvb, DATA_CHUNK_STREAM_SEQ_NUMBER_OFFSET); payload_proto_id = tvb_get_ntohl(chunk_tvb, DATA_CHUNK_PAYLOAD_PROTOCOL_ID_OFFSET); payload_length = length - DATA_CHUNK_HEADER_LENGTH; padding_length = nr_of_padding_bytes(length); proto_tree_add_uint(chunk_tree, hf_sctp_data_chunk_tsn, chunk_tvb, DATA_CHUNK_TSN_OFFSET, DATA_CHUNK_TSN_LENGTH, tsn); proto_tree_add_uint(chunk_tree, hf_sctp_data_chunk_stream_id, chunk_tvb, DATA_CHUNK_STREAM_ID_OFFSET, DATA_CHUNK_STREAM_ID_LENGTH, stream_id); proto_tree_add_uint(chunk_tree, hf_sctp_data_chunk_stream_seq_number, chunk_tvb, DATA_CHUNK_STREAM_SEQ_NUMBER_OFFSET, DATA_CHUNK_STREAM_SEQ_NUMBER_LENGTH, stream_seq_number); proto_tree_add_uint(chunk_tree, hf_sctp_data_chunk_payload_proto_id, chunk_tvb, DATA_CHUNK_PAYLOAD_PROTOCOL_ID_OFFSET, DATA_CHUNK_PAYLOAD_PROTOCOL_ID_LENGTH, payload_proto_id); proto_tree_add_text(chunk_tree, chunk_tvb, DATA_CHUNK_PAYLOAD_OFFSET, payload_length, "Payload (%u byte%s)", payload_length, plurality(payload_length, "", "s")); if (padding_length > 0) proto_tree_add_text(chunk_tree, chunk_tvb, CHUNK_HEADER_OFFSET + length, padding_length, "Padding: %u byte%s", padding_length, plurality(padding_length, "", "s")); proto_item_set_text(chunk_item, "DATA chunk with TSN %u (%u:%u) containing %u byte%s of payload", tsn, stream_id, stream_seq_number, payload_length, plurality(payload_length, "", "s")); } void dissect_init_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint32 initiate_tag, adv_rec_window_credit, initial_tsn; guint16 number_of_inbound_streams, number_of_outbound_streams; guint8 type; tvbuff_t *parameter_list_tvb; type = tvb_get_guint8(chunk_tvb, CHUNK_TYPE_OFFSET); initiate_tag = tvb_get_ntohl(chunk_tvb, INIT_CHUNK_INITIATE_TAG_OFFSET); adv_rec_window_credit = tvb_get_ntohl(chunk_tvb, INIT_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET); number_of_inbound_streams = tvb_get_ntohs(chunk_tvb, INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_OFFSET); number_of_outbound_streams = tvb_get_ntohs(chunk_tvb, INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_OFFSET); initial_tsn = tvb_get_ntohl(chunk_tvb, INIT_CHUNK_INITIAL_TSN_OFFSET); /* handle fixed parameters */ proto_tree_add_uint(chunk_tree, hf_sctp_init_chunk_initiate_tag, chunk_tvb, INIT_CHUNK_INITIATE_TAG_OFFSET, INIT_CHUNK_INITIATE_TAG_LENGTH, initiate_tag); proto_tree_add_uint(chunk_tree, hf_sctp_init_chunk_adv_rec_window_credit, chunk_tvb, INIT_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET, INIT_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH, adv_rec_window_credit); proto_tree_add_uint(chunk_tree, hf_sctp_init_chunk_number_of_outbound_streams, chunk_tvb, INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_OFFSET, INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_LENGTH, number_of_outbound_streams); proto_tree_add_uint(chunk_tree, hf_sctp_init_chunk_number_of_inbound_streams, chunk_tvb, INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_OFFSET, INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_LENGTH, number_of_inbound_streams); proto_tree_add_uint(chunk_tree, hf_sctp_init_chunk_initial_tsn, chunk_tvb, INIT_CHUNK_INITIAL_TSN_OFFSET, INIT_CHUNK_INITIAL_TSN_LENGTH, initial_tsn); /* handle variable paramters */ parameter_list_tvb = tvb_new_subset(chunk_tvb, INIT_CHUNK_VARIABLE_LENGTH_PARAMETER_OFFSET, -1, -1); dissect_tlv_parameter_list(parameter_list_tvb, chunk_tree); proto_item_set_text(chunk_item, "%s chunk requesting for %u outbound stream%s and accepting up to %u inbound stream%s", val_to_str(type, sctp_chunk_type_values, "unknown"), number_of_outbound_streams, plurality(number_of_outbound_streams, "", "s"), number_of_inbound_streams, plurality(number_of_inbound_streams, "", "s")); } void dissect_init_ack_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { dissect_init_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); } void dissect_sack_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint32 cumulative_tsn_ack, adv_rec_window_credit, dup_tsn; guint16 number_of_gap_blocks, number_of_dup_tsns; guint16 gap_block_number, dup_tsn_number, start, end; gint gap_block_offset, dup_tsn_offset; proto_item *block_item; proto_tree *block_tree; cumulative_tsn_ack = tvb_get_ntohl(chunk_tvb, SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET); adv_rec_window_credit = tvb_get_ntohl(chunk_tvb, SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET); number_of_gap_blocks = tvb_get_ntohs(chunk_tvb, SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET); number_of_dup_tsns = tvb_get_ntohs(chunk_tvb, SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET); proto_tree_add_uint(chunk_tree, hf_sctp_sack_chunk_cumulative_tsn_ack, chunk_tvb, SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET, SACK_CHUNK_CUMULATIVE_TSN_ACK_LENGTH, cumulative_tsn_ack); proto_tree_add_uint(chunk_tree, hf_sctp_sack_chunk_adv_rec_window_credit, chunk_tvb, SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET, SACK_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH, adv_rec_window_credit); proto_tree_add_uint(chunk_tree, hf_sctp_sack_chunk_number_of_gap_blocks, chunk_tvb, SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET, SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_LENGTH, number_of_gap_blocks); proto_tree_add_uint(chunk_tree, hf_sctp_sack_chunk_number_of_dup_tsns, chunk_tvb, SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET, SACK_CHUNK_NUMBER_OF_DUP_TSNS_LENGTH, number_of_dup_tsns); /* handle the gap acknowledgement blocks */ gap_block_offset = SACK_CHUNK_GAP_BLOCK_OFFSET; for(gap_block_number = 1; gap_block_number <= number_of_gap_blocks; gap_block_number++) { start = tvb_get_ntohs(chunk_tvb, gap_block_offset); end = tvb_get_ntohs(chunk_tvb, gap_block_offset + SACK_CHUNK_GAP_BLOCK_START_LENGTH); block_item = proto_tree_add_text(chunk_tree, chunk_tvb, gap_block_offset, SACK_CHUNK_GAP_BLOCK_LENGTH, "Gap Acknowledgement for %u TSN%s", 1 + end - start, plurality(1 + end - start, "", "s")); block_tree = proto_item_add_subtree(block_item, ett_sctp_sack_chunk_gap_block); proto_tree_add_uint(block_tree, hf_sctp_sack_chunk_gap_block_start, chunk_tvb, gap_block_offset, SACK_CHUNK_GAP_BLOCK_START_LENGTH, start); proto_tree_add_uint(block_tree, hf_sctp_sack_chunk_gap_block_end, chunk_tvb, gap_block_offset + SACK_CHUNK_GAP_BLOCK_START_LENGTH, SACK_CHUNK_GAP_BLOCK_END_LENGTH, end); gap_block_offset += SACK_CHUNK_GAP_BLOCK_LENGTH; }; /* handle the duplicate TSNs */ dup_tsn_offset = SACK_CHUNK_GAP_BLOCK_OFFSET + number_of_gap_blocks * SACK_CHUNK_GAP_BLOCK_LENGTH; for(dup_tsn_number = 1; dup_tsn_number <= number_of_dup_tsns; dup_tsn_number++) { dup_tsn = tvb_get_ntohl(chunk_tvb, dup_tsn_offset); proto_tree_add_uint(chunk_tree, hf_sctp_sack_chunk_duplicate_tsn, chunk_tvb, dup_tsn, SACK_CHUNK_DUP_TSN_LENGTH, dup_tsn); dup_tsn_offset += SACK_CHUNK_DUP_TSN_LENGTH; }; proto_item_set_text(chunk_item, "SACK chunk acknowledging TSN %u and reporting %u gap%s and %u duplicate TSN%s", cumulative_tsn_ack, number_of_gap_blocks, plurality(number_of_gap_blocks, "", "s"), number_of_dup_tsns, plurality(number_of_dup_tsns, "", "s")); } void dissect_heartbeat_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { tvbuff_t *parameter_tvb; guint chunk_length, info_length, padding_length, total_length; chunk_length = tvb_get_ntohs(chunk_tvb, CHUNK_LENGTH_OFFSET); info_length = chunk_length - CHUNK_HEADER_LENGTH; padding_length = nr_of_padding_bytes(info_length); total_length = info_length + padding_length; parameter_tvb = tvb_new_subset(chunk_tvb, HEARTBEAT_CHUNK_INFO_OFFSET, total_length, total_length); dissect_parameter(parameter_tvb, chunk_tree); proto_item_set_text(chunk_item, "HEARTBEAT chunk"); } void dissect_heartbeat_ack_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { tvbuff_t *parameter_tvb; guint chunk_length, info_length, padding_length, total_length; chunk_length = tvb_get_ntohs(chunk_tvb, CHUNK_LENGTH_OFFSET); info_length = chunk_length - CHUNK_HEADER_LENGTH; padding_length = nr_of_padding_bytes(info_length); total_length = info_length + padding_length; parameter_tvb = tvb_new_subset(chunk_tvb, HEARTBEAT_CHUNK_INFO_OFFSET, total_length, total_length); dissect_parameter(parameter_tvb, chunk_tree); proto_item_set_text(chunk_item, "HEARTBEAT ACK chunk"); } void dissect_abort_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint offset, number_of_causes; guint16 length, padding_length, total_length; tvbuff_t *cause_tvb; number_of_causes = 0; offset = ABORT_CHUNK_FIRST_ERROR_CAUSE_OFFSET; while(tvb_length_remaining(chunk_tvb, offset)) { length = tvb_get_ntohs(chunk_tvb, offset + CAUSE_LENGTH_OFFSET); padding_length = nr_of_padding_bytes(length); total_length = length + padding_length; /* create a tvb for the chunk including the padding bytes */ cause_tvb = tvb_new_subset(chunk_tvb, offset, total_length, total_length); dissect_error_cause(cause_tvb, chunk_tree); /* get rid of the handled parameter */ offset += total_length; number_of_causes++; }; proto_item_set_text(chunk_item, "Abort chunk with %u cause%s", number_of_causes, plurality(number_of_causes, "", "s")); } void dissect_shutdown_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint32 cumulative_tsn_ack; cumulative_tsn_ack = tvb_get_ntohl(chunk_tvb, SHUTDOWN_CHUNK_CUMULATIVE_TSN_ACK_OFFSET); proto_tree_add_uint(chunk_tree, hf_sctp_shutdown_chunk_cumulative_tsn_ack, chunk_tvb, SHUTDOWN_CHUNK_CUMULATIVE_TSN_ACK_OFFSET, SHUTDOWN_CHUNK_CUMULATIVE_TSN_ACK_LENGTH, cumulative_tsn_ack); proto_item_set_text(chunk_item, "SHUTDOWN chunk acknowledging up to TSN %u", cumulative_tsn_ack); } void dissect_shutdown_ack_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { proto_item_set_text(chunk_item, "SHUTDOWN ACK chunk"); } void dissect_error_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint offset, number_of_causes; guint16 length, padding_length, total_length; tvbuff_t *cause_tvb; number_of_causes = 0; offset = ERROR_CHUNK_FIRST_ERROR_CAUSE_OFFSET; do { length = tvb_get_ntohs(chunk_tvb, offset + CAUSE_LENGTH_OFFSET); padding_length = nr_of_padding_bytes(length); total_length = length + padding_length; /* create a tvb for the chunk including the padding bytes */ cause_tvb = tvb_new_subset(chunk_tvb, offset, total_length, total_length); dissect_error_cause(cause_tvb, chunk_tree); /* get rid of the handled parameter */ offset += total_length; number_of_causes++; } while(tvb_length_remaining(chunk_tvb, offset)); proto_item_set_text(chunk_item, "Error chunk with %u cause%s", number_of_causes, plurality(number_of_causes, "", "s")); } void dissect_cookie_echo_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint length, cookie_length, padding_length; length = tvb_get_ntohs(chunk_tvb, CHUNK_LENGTH_OFFSET); padding_length = nr_of_padding_bytes(length); cookie_length = length - CHUNK_HEADER_LENGTH; proto_tree_add_text(chunk_tree, chunk_tvb, COOKIE_ECHO_CHUNK_COOKIE_OFFSET, cookie_length, "Cookie (%u byte%s)", cookie_length, plurality(cookie_length, "", "s")); proto_item_set_text(chunk_item, "COOKIE ECHO chunk containing a cookie of %u byte%s", cookie_length, plurality(cookie_length, "", "s")); if (padding_length > 0) proto_tree_add_text(chunk_tree, chunk_tvb, CHUNK_HEADER_OFFSET + length, padding_length, "Padding: %u byte%s", padding_length, plurality(padding_length, "", "s")); } void dissect_cookie_ack_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { proto_item_set_text(chunk_item, "COOKIE ACK chunk"); } void dissect_ecne_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint32 lowest_tsn; lowest_tsn = tvb_get_ntohl(chunk_tvb, ECNE_CHUNK_LOWEST_TSN_OFFSET); proto_tree_add_uint(chunk_tree, hf_sctp_ecne_chunk_lowest_tsn, chunk_tvb, ECNE_CHUNK_LOWEST_TSN_OFFSET, ECNE_CHUNK_LOWEST_TSN_LENGTH, lowest_tsn); proto_item_set_text(chunk_item, "ECNE chunk"); } void dissect_cwr_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint32 lowest_tsn; lowest_tsn = tvb_get_ntohl(chunk_tvb, CWR_CHUNK_LOWEST_TSN_OFFSET); proto_tree_add_uint(chunk_tree, hf_sctp_cwr_chunk_lowest_tsn, chunk_tvb, CWR_CHUNK_LOWEST_TSN_OFFSET, CWR_CHUNK_LOWEST_TSN_LENGTH, lowest_tsn); proto_item_set_text(chunk_item, "CWR chunk"); } void dissect_shutdown_complete_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint8 flags; guint16 length; proto_tree *flag_tree; flags = tvb_get_guint8(chunk_tvb, CHUNK_FLAGS_OFFSET); length = tvb_get_ntohs(chunk_tvb, CHUNK_LENGTH_OFFSET); flag_tree = proto_item_add_subtree(flags_item, ett_sctp_data_chunk_flags); proto_tree_add_boolean(flag_tree, hf_sctp_shutdown_complete_chunk_t_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, flags); proto_item_set_text(chunk_item, "SHUTDOWN COMPLETE chunk"); } void dissect_unknown_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint length, chunk_value_length, padding_length; guint8 type; length = tvb_get_ntohs(chunk_tvb, CHUNK_LENGTH_OFFSET); padding_length = nr_of_padding_bytes(length); type = tvb_get_guint8(chunk_tvb, CHUNK_TYPE_OFFSET); chunk_value_length = length - CHUNK_HEADER_LENGTH; proto_tree_add_text(chunk_tree, chunk_tvb, CHUNK_VALUE_OFFSET, chunk_value_length, "Chunk value (%u byte%s)", chunk_value_length, plurality(chunk_value_length, "", "s")); if (padding_length > 0) proto_tree_add_text(chunk_tree, chunk_tvb, CHUNK_HEADER_OFFSET + length, padding_length, "Padding: %u byte%s", padding_length, plurality(padding_length, "", "s")); proto_item_set_text(chunk_item, "Chunk of type %u and %u byte%s value", type, chunk_value_length, plurality(chunk_value_length, "", "s")); } void dissect_sctp_chunk(tvbuff_t *chunk_tvb, proto_tree *sctp_tree) { guint8 type, flags; guint16 length; proto_item *flags_item; proto_item *chunk_item; proto_tree *chunk_tree; /* first extract the chunk header */ type = tvb_get_guint8(chunk_tvb, CHUNK_TYPE_OFFSET); flags = tvb_get_guint8(chunk_tvb, CHUNK_FLAGS_OFFSET); length = tvb_get_ntohs(chunk_tvb, CHUNK_LENGTH_OFFSET); /* create proto_tree stuff */ chunk_item = proto_tree_add_text(sctp_tree, chunk_tvb, CHUNK_HEADER_OFFSET, tvb_length(chunk_tvb), "Incomplete chunk"); chunk_tree = proto_item_add_subtree(chunk_item, ett_sctp_chunk); /* then insert the chunk header components into the protocol tree */ proto_tree_add_uint_format(chunk_tree, hf_sctp_chunk_type, chunk_tvb, CHUNK_TYPE_OFFSET, CHUNK_TYPE_LENGTH, type, "Identifier: %u (%s)", type, val_to_str(type, sctp_chunk_type_values, "unknown")); flags_item = proto_tree_add_uint(chunk_tree, hf_sctp_chunk_flags, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, flags); proto_tree_add_uint(chunk_tree, hf_sctp_chunk_length, chunk_tvb, CHUNK_LENGTH_OFFSET, CHUNK_LENGTH_LENGTH, length); /* now dissect the chunk value */ switch(type) { case SCTP_DATA_CHUNK_ID: dissect_data_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_INIT_CHUNK_ID: dissect_init_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_INIT_ACK_CHUNK_ID: dissect_init_ack_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_SACK_CHUNK_ID: dissect_sack_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_HEARTBEAT_CHUNK_ID: dissect_heartbeat_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_HEARTBEAT_ACK_CHUNK_ID: dissect_heartbeat_ack_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_ABORT_CHUNK_ID: dissect_abort_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_SHUTDOWN_CHUNK_ID: dissect_shutdown_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_SHUTDOWN_ACK_CHUNK_ID: dissect_shutdown_ack_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_ERROR_CHUNK_ID: dissect_error_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_COOKIE_ECHO_CHUNK_ID: dissect_cookie_echo_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_COOKIE_ACK_CHUNK_ID: dissect_cookie_ack_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_ECNE_CHUNK_ID: dissect_ecne_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_CWR_CHUNK_ID: dissect_cwr_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; case SCTP_SHUTDOWN_COMPLETE_CHUNK_ID: dissect_shutdown_complete_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; default: dissect_unknown_chunk(chunk_tvb, chunk_tree, chunk_item, flags_item); break; } } void dissect_sctp_chunks(tvbuff_t *tvb, proto_tree *sctp_tree) { tvbuff_t *chunk_tvb; guint16 length, padding_length, total_length; gint offset; /* the common header of the datagram is already handled */ offset = COMMON_HEADER_LENGTH; while(tvb_length_remaining(tvb, offset) > 0) { /* extract the chunk length and compute number of padding bytes */ length = tvb_get_ntohs(tvb, offset + CHUNK_LENGTH_OFFSET); padding_length = nr_of_padding_bytes(length); total_length = length + padding_length; /* create a tvb for the chunk including the padding bytes */ chunk_tvb = tvb_new_subset(tvb, offset, total_length, total_length); /* call dissect_sctp_chunk for a actual work */ dissect_sctp_chunk(chunk_tvb, sctp_tree); /* get rid of the dissected chunk */ offset += total_length; } } /* dissect_sctp handles the common header of a SCTP datagram. * For the handling of the chunks dissect_sctp_chunks is called. */ static void dissect_sctp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { guint16 source_port, destination_port; guint32 verification_tag, checksum; proto_item *ti; proto_tree *sctp_tree; pinfo->current_proto = "SCTP"; /* Extract the common header */ source_port = tvb_get_ntohs(tvb, SOURCE_PORT_OFFSET); destination_port = tvb_get_ntohs(tvb, DESTINATION_PORT_OFFSET); verification_tag = tvb_get_ntohl(tvb, VERIFICATION_TAG_OFFSET); checksum = tvb_get_ntohl(tvb, CHECKSUM_OFFSET); /* make entry in the Protocol column on summary display */ if (check_col(pinfo->fd, COL_PROTOCOL)) col_add_str(pinfo->fd, COL_PROTOCOL, "SCTP"); /* Make entries in Info column on summary display */ if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "%u > %u: tag 0x%x", source_port, destination_port, verification_tag); /* In the interest of speed, if "tree" is NULL, don't do any work not necessary to generate protocol tree items. */ if (tree) { /* create the sctp protocol tree */ ti = proto_tree_add_protocol_format(tree, proto_sctp, tvb, 0, tvb_length(tvb), "Stream Control Transmission Protocol"); sctp_tree = proto_item_add_subtree(ti, ett_sctp); /* add the components of the common header to the protocol tree */ proto_tree_add_uint(sctp_tree, hf_sctp_source_port, tvb, SOURCE_PORT_OFFSET, SOURCE_PORT_LENGTH, source_port); proto_tree_add_uint(sctp_tree, hf_sctp_destination_port, tvb, DESTINATION_PORT_OFFSET, DESTINATION_PORT_LENGTH, destination_port); proto_tree_add_uint(sctp_tree, hf_sctp_verification_tag, tvb, VERIFICATION_TAG_OFFSET, VERIFICATION_TAG_LENGTH, verification_tag); proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Adler-32 checksum: 0x%08x (%s)", checksum, sctp_checksum_state(tvb, checksum)); /* add all chunks of the sctp datagram to the protocol tree */ dissect_sctp_chunks(tvb, sctp_tree); }; } /* Register the protocol with Ethereal */ void proto_register_sctp(void) { /* Setup list of header fields */ static hf_register_info hf[] = { { &hf_sctp_source_port, { "Source port", "sctp.srcport", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, { &hf_sctp_destination_port, { "Destination port", "sctp.dstport", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, { &hf_sctp_verification_tag, { "Verification tag", "sctp.verfication_tag", FT_UINT32, BASE_HEX, NULL, 0x0, ""} }, { &hf_sctp_checksum, { "Adler-32 checksum", "sctp.checksum", FT_UINT32, BASE_HEX, NULL, 0x0, ""} }, { &hf_sctp_chunk_type, { "Identifier", "sctp.chunk_type", FT_UINT8, BASE_DEC, NULL, 0x0, ""} }, { &hf_sctp_chunk_flags, { "Flags", "sctp.chunk_flags", FT_UINT8, BASE_BIN, NULL, 0x0, ""} }, { &hf_sctp_chunk_length, { "Length", "sctp.chunk_length", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, { &hf_sctp_init_chunk_initiate_tag, { "Initiate tag", "sctp.init.chunk.initiate.tag", FT_UINT32, BASE_HEX, NULL, 0x0, ""} }, { &hf_sctp_init_chunk_adv_rec_window_credit, { "Advertised reciever window credit (a_rwnd)", "sctp.init.chunk.credit", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, { &hf_sctp_init_chunk_number_of_outbound_streams, { "Number of outbound streams", "sctp.init.chunk.nr.out.streams", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, { &hf_sctp_init_chunk_number_of_inbound_streams, { "Number of inbound streams", "sctp.init.chunk.nr.in.streams", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_init_chunk_initial_tsn, { "Initial TSN", "sctp.init.chunk.initial.tsn", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_cumulative_tsn_ack, { "Cumulative TSN Ack", "sctp.cumulative.tsn.ack", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_data_chunk_tsn, { "TSN", "sctp.tsn", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_data_chunk_stream_id, { "Stream Identifier", "sctp.stream_id", FT_UINT16, BASE_HEX, NULL, 0x0, ""} }, {&hf_sctp_data_chunk_stream_seq_number, { "Stream sequence number", "sctp.stream_seq_number", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_data_chunk_payload_proto_id, { "Payload Protocol identifier", "sctp.payload_proto_id", FT_UINT32, BASE_HEX, NULL, 0x0, ""} }, {&hf_sctp_data_chunk_e_bit, { "E-Bit", "sctp.data.e_bit", FT_BOOLEAN, 8, TFS(&sctp_data_chunk_e_bit_value), SCTP_DATA_CHUNK_E_BIT, ""} }, {&hf_sctp_data_chunk_b_bit, { "B-Bit", "sctp.data.b_bit", FT_BOOLEAN, 8, TFS(&sctp_data_chunk_b_bit_value), SCTP_DATA_CHUNK_B_BIT, ""} }, {&hf_sctp_data_chunk_u_bit, { "U-Bit", "sctp.data.u.bit", FT_BOOLEAN, 8, TFS(&sctp_data_chunk_u_bit_value), SCTP_DATA_CHUNK_U_BIT, ""} }, {&hf_sctp_sack_chunk_cumulative_tsn_ack, { "Cumulative TSN ACK", "sctp.sack.cumulative_tsn_ack", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_sack_chunk_adv_rec_window_credit, { "Advertised receiver window credit (a_rwnd)", "sctp.sack.a_rwnd", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_sack_chunk_number_of_gap_blocks, { "Number of gap acknowldgement blocks ", "sctp.sack.number_of_gap_blocks", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_sack_chunk_number_of_dup_tsns, { "Number of duplicated TSNs", "sctp.sack.number_of_duplicated_tsns", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_sack_chunk_gap_block_start, { "Start", "sctp.sack.gap_block_start", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_sack_chunk_gap_block_end, { "End", "sctp.sack.gap_block_end", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_sack_chunk_duplicate_tsn, { "Duplicate TSN", "sctp.sack.duplicate.tsn", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_shutdown_chunk_cumulative_tsn_ack, { "Cumulative TSN Ack", "sctp.shutdown.cumulative_tsn_ack", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_ecne_chunk_lowest_tsn, { "Lowest TSN", "sctp.ecne.lowest_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_cwr_chunk_lowest_tsn, { "Lowest TSN", "sctp.cwr.lowest_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_shutdown_complete_chunk_t_bit, { "E-Bit", "sctp.shutdown_complete.t_bit", FT_BOOLEAN, 8, TFS(&sctp_shutdown_complete_chunk_t_bit_value), SCTP_SHUTDOWN_COMPLETE_CHUNK_T_BIT, ""} }, {&hf_sctp_chunk_parameter_type, { "Parameter type", "sctp.parameter.type", FT_UINT16, BASE_HEX, NULL, 0x0, ""} }, {&hf_sctp_chunk_parameter_length, { "Parameter length", "sctp.parameter.length", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_parameter_ipv4_address, { "IP Version 4 address", "sctp.parameter.ipv4_address", FT_IPv4, BASE_NONE, NULL, 0x0, ""} }, {&hf_sctp_parameter_ipv6_address, { "IP Version 6 address", "sctp.parameter.ipv6_address", FT_IPv6, BASE_NONE, NULL, 0x0, ""} }, {&hf_sctp_parameter_cookie_preservative_increment, { "Suggested Cookie life-span increment (msec)", "sctp.parameter.cookie_preservative_incr", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_parameter_hostname_hostname, { "Hostname", "sctp.parameter.hostname.hostname", FT_STRING, BASE_NONE, NULL, 0x0, ""} }, {&hf_sctp_supported_address_types_parameter, { "Supported address type", "sctp.parameter.supported_addres_type", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_cause_code, { "Cause code", "sctp.cause.code", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_cause_length, { "Cause length", "sctp.cause.length", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_cause_stream_identifier, { "Stream identifier", "sctp.cause.stream_identifier", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_cause_number_of_missing_parameters, { "Number of missing parameters", "sctp.cause.nr_of_missing_parameters", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_cause_missing_parameter_type, { "Missing parameters type", "sctp.cause.missing_parameter_type", FT_UINT16, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_cause_measure_of_staleness, { "Measure of staleness in usec", "sctp.cause.measure_of_staleness", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, {&hf_sctp_cause_tsn, { "TSN", "sctp.cause.tsn", FT_UINT32, BASE_DEC, NULL, 0x0, ""} }, }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_sctp, &ett_sctp_chunk, &ett_sctp_chunk_parameter, &ett_sctp_chunk_cause, &ett_sctp_data_chunk_flags, &ett_sctp_sack_chunk_gap_block, &ett_sctp_supported_address_types_parameter, &ett_sctp_unrecognized_parameter_parameter }; /* Register the protocol name and description */ proto_sctp = proto_register_protocol("Stream Control Transmission Protcol", "sctp"); /* Required function calls to register the header fields and subtrees used */ proto_register_field_array(proto_sctp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); }; void proto_reg_handoff_sctp(void) { dissector_add("ip.proto", IP_PROTO_SCTP, dissect_sctp); }