/* packet-sctp.c * Routines for Stream Control Transmission Protocol dissection * It should be compilant to * - RFC 2960, for basic SCTP support * - http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-addip-sctp-03.txt for the add-IP extension * - http://www.sctp.org/draft-ietf-tsvwg-usctp-01.txt for the 'Limited Retransmission' extension * - http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-sctpcsum-01.txt * Copyright 2000, 2001, 2002, Michael Tuexen * Still to do (so stay tuned) * - support for reassembly * - code cleanup * * $Id: packet-sctp.c,v 1.31 2002/02/02 21:17:10 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 #include #include #ifdef NEED_SNPRINTF_H # include "snprintf.h" #endif #include "prefs.h" #include #include "ipproto.h" /* Initialize the protocol and registered fields */ static int proto_sctp = -1; static int hf_sctp_port = -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_checksum_bad = -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; static int hf_sctp_forward_tsn_chunk_tsn = -1; static int hf_sctp_ustreams_start = -1; static int hf_sctp_ustreams_end = -1; static int hf_sctp_asconf_ack_serial = -1; static int hf_sctp_asconf_ack_correlation_id = -1; static int hf_sctp_asconf_serial = -1; static int hf_sctp_asconf_correlation_id = -1; static int hf_sctp_asconf_reserved = -1; static int hf_sctp_asconf_addr_type = -1; static int hf_sctp_asconf_addr = -1; static int hf_sctp_asconf_ipv4_address = -1; static int hf_sctp_asconf_ipv6_address = -1; static int hf_sctp_adap_indication = -1; static dissector_table_t sctp_port_dissector_table; static dissector_table_t sctp_ppi_dissector_table; static module_t *sctp_module; /* 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; static gint ett_sctp_unreliable_streams_interval = -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_FORWARD_TSN_CHUNK_ID 192 #define SCTP_ASCONF_ACK_CHUNK_ID 0x80 #define SCTP_ASCONF_CHUNK_ID 0XC1 #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_FORWARD_TSN_CHUNK_ID, "FORWARD TSN" }, { SCTP_ASCONF_ACK_CHUNK_ID, "ASCONF_ACK" }, { SCTP_ASCONF_CHUNK_ID, "ASCONF" }, { 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 #define UNRELIABLE_STREAMS_PARAMETER_ID 0xC000 #define ADD_IP_ADDRESS_PARAMETER_ID 0xC001 #define DEL_IP_ADDRESS_PARAMETER_ID 0xC002 #define ERROR_CAUSE_INDICATION_PARAMETER_ID 0xC003 #define SET_PRIMARY_ADDRESS_PARAMETER_ID 0xC004 #define SUCCESS_REPORT_PARAMETER_ID 0xC005 #define ADAP_LAYER_INDICATION_PARAMETER_ID 0xC006 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" }, { UNRELIABLE_STREAMS_PARAMETER_ID, "Unreliable streams" }, { ADD_IP_ADDRESS_PARAMETER_ID, "Add IP address" }, { DEL_IP_ADDRESS_PARAMETER_ID, "Delete IP address" }, { ERROR_CAUSE_INDICATION_PARAMETER_ID, "Error cause indication" }, { SET_PRIMARY_ADDRESS_PARAMETER_ID, "Set primary address" }, { SUCCESS_REPORT_PARAMETER_ID, "Success report" }, { ADAP_LAYER_INDICATION_PARAMETER_ID, "Adaptation Layer Indication" }, { 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 #define REQUEST_TO_DELETE_LAST_ADDRESS 0x0c #define OPERATION_REFUSED_DUE_TO_RESOURCE_SHORTAGE 0X0d #define REQUEST_TO_DELETE_SOURCE_ADDRESS 0x0e static const value_string sctp_cause_code_values[] = { { INVALID_STREAM_IDENTIFIER, "Invalid stream identifier" }, { 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" }, { REQUEST_TO_DELETE_LAST_ADDRESS, "Request to delete last address" }, { OPERATION_REFUSED_DUE_TO_RESOURCE_SHORTAGE, "Operation refused due to resource shortage" }, { REQUEST_TO_DELETE_SOURCE_ADDRESS, "Request to delete source address" }, { 0, NULL } }; #define NOT_SPECIFIED_PROTOCOL_ID 0 #define IUA_PAYLOAD_PROTOCOL_ID 1 #define M2UA_PAYLOAD_PROTOCOL_ID 2 #define M3UA_PAYLOAD_PROTOCOL_ID 3 #define SUA_PAYLOAD_PROTOCOL_ID 4 #define M2PA_PAYLOAD_PROTOCOL_ID 5 #define V5UA_PAYLOAD_PROTOCOL_ID 6 static const value_string sctp_payload_proto_id_values[] = { { NOT_SPECIFIED_PROTOCOL_ID, "not specified" }, { IUA_PAYLOAD_PROTOCOL_ID, "IUA" }, { M2UA_PAYLOAD_PROTOCOL_ID, "M2UA" }, { M3UA_PAYLOAD_PROTOCOL_ID, "M3UA" }, { SUA_PAYLOAD_PROTOCOL_ID, "SUA" }, { M2PA_PAYLOAD_PROTOCOL_ID, "M2PA" }, { V5UA_PAYLOAD_PROTOCOL_ID, "V5UA" }, { 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" }; #define SCTP_CHECKSUM_NONE 0 #define SCTP_CHECKSUM_ADLER32 1 #define SCTP_CHECKSUM_CRC32C 2 #define SCTP_CHECKSUM_AUTOMATIC 3 static gint sctp_checksum = SCTP_CHECKSUM_ADLER32; /* 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); static unsigned int sctp_adler32(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; } /* The CRC32C code is taken from draft-ietf-tsvwg-sctpcsum-01.txt. * That code is copyrighted by D. Otis and has been modified. */ #define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF]) static unsigned long crc_c[256] = { 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L, 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL, 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL, 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L, 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL, 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L, 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L, 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL, 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL, 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L, 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L, 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL, 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L, 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL, 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL, 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L, 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L, 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L, 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L, 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L, 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L, 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L, 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L, 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L, 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L, 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L, 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L, 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L, 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L, 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L, 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L, 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L, 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL, 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L, 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L, 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL, 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L, 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL, 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL, 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L, 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L, 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL, 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL, 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L, 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL, 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L, 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L, 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL, 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L, 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL, 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL, 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L, 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL, 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L, 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L, 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL, 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL, 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L, 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L, 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL, 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L, 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL, 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL, 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L, }; static unsigned int sctp_crc32c(const unsigned char* buf, unsigned int len) { unsigned int i; unsigned long crc32 = ~0L; for (i = 0; i < SOURCE_PORT_LENGTH + DESTINATION_PORT_LENGTH + VERIFICATION_TAG_LENGTH; i++) { CRC32C(crc32, buf[i]); } CRC32C(crc32, 0); CRC32C(crc32, 0); CRC32C(crc32, 0); CRC32C(crc32, 0); for (i = COMMON_HEADER_LENGTH; i < len; i++) { CRC32C(crc32, buf[i]); } return crc32; } static 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 */ static void dissect_parameter(tvbuff_t *, packet_info *, proto_tree *); static void dissect_error_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *chunk_tree); static gboolean dissect_sctp_chunk(tvbuff_t *, packet_info *, proto_tree *, proto_tree *); static void dissect_tlv_parameter_list(tvbuff_t *parameter_list_tvb, packet_info *pinfo, proto_tree *tree) { guint offset, length, padding_length, total_length; tvbuff_t *parameter_tvb; offset = 0; while(tvb_reported_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, pinfo, tree); /* get rid of the handled parameter */ offset += total_length; } } static 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")); } static 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"); } static 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"); } static 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")); } static void dissect_unrecognized_parameters_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 length, padding_length, parameter_value_length; tvbuff_t *unrecognized_parameters_tvb; length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); padding_length = nr_of_padding_bytes(length); parameter_value_length = length - PARAMETER_HEADER_LENGTH + padding_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, pinfo, parameter_tree); proto_item_set_text(parameter_item, "Unrecognized parameter of type"); } static 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); } static 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"); } static 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: 0x%04x (%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")); } static void dissect_ecn_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { proto_item_set_text(parameter_item, "ECN parameter"); } #define USTREAMS_START_LENGTH 2 #define USTREAMS_END_LENGTH 2 #define USTREAMS_INTERVAL_LENGTH (USTREAMS_START_LENGTH + USTREAMS_END_LENGTH) static void dissect_unreliable_streams_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 length, start, end, number_of_intervals, interval_number; proto_item *interval_item; proto_tree *interval_tree; gint interval_offset; length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); number_of_intervals = (length - PARAMETER_HEADER_LENGTH) / USTREAMS_INTERVAL_LENGTH; interval_offset = PARAMETER_VALUE_OFFSET; for(interval_number = 1; interval_number <= number_of_intervals; interval_number++) { start = tvb_get_ntohs(parameter_tvb, interval_offset); end = tvb_get_ntohs(parameter_tvb, interval_offset + USTREAMS_START_LENGTH); interval_item = proto_tree_add_text(parameter_tree, parameter_tvb, interval_offset, USTREAMS_INTERVAL_LENGTH, "Unreliable streams (%u-%u)", start, end); interval_tree = proto_item_add_subtree(interval_item, ett_sctp_unreliable_streams_interval); proto_tree_add_uint(interval_tree, hf_sctp_ustreams_start, parameter_tvb, interval_offset, USTREAMS_START_LENGTH, start); proto_tree_add_uint(interval_tree, hf_sctp_ustreams_end, parameter_tvb, interval_offset + USTREAMS_START_LENGTH, USTREAMS_END_LENGTH, end); interval_offset += USTREAMS_INTERVAL_LENGTH; }; proto_item_set_text(parameter_item, "Unreliable streams parameter"); } static void dissect_add_ip_address_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 length, parameter_value_length; tvbuff_t *address_tvb; length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); parameter_value_length = length - PARAMETER_HEADER_LENGTH; address_tvb = tvb_new_subset(parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, parameter_value_length); dissect_parameter(address_tvb, pinfo, parameter_tree); proto_item_set_text(parameter_item, "Add IP address parameter"); } static void dissect_del_ip_address_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 length, parameter_value_length; tvbuff_t *address_tvb; length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); parameter_value_length = length - PARAMETER_HEADER_LENGTH; address_tvb = tvb_new_subset(parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, parameter_value_length); dissect_parameter(address_tvb, pinfo, parameter_tree); proto_item_set_text(parameter_item, "Delete IP address parameter"); } static void dissect_error_cause_indication_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 length, padding_length, total_length; gint offset; tvbuff_t *error_cause_tvb; offset = PARAMETER_VALUE_OFFSET; while(tvb_reported_length_remaining(parameter_tvb, offset)) { length = tvb_get_ntohs(parameter_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 */ error_cause_tvb = tvb_new_subset(parameter_tvb, offset , total_length, total_length); dissect_error_cause(error_cause_tvb, pinfo, parameter_tree); /* get rid of the handled parameter */ offset += total_length; } proto_item_set_text(parameter_item, "Error cause indication"); } static void dissect_set_primary_address_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree, proto_item *parameter_item) { guint16 length, parameter_value_length; tvbuff_t *address_tvb; length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET); parameter_value_length = length - PARAMETER_HEADER_LENGTH; address_tvb = tvb_new_subset(parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, parameter_value_length); dissect_parameter(address_tvb, pinfo, parameter_tree); proto_item_set_text(parameter_item, "Set primary address parameter"); } static void dissect_success_report_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { proto_item_set_text(parameter_item, "Success report parameter"); } #define ADAP_INDICATION_LENGTH 4 #define ADAP_INDICATION_OFFSET PARAMETER_VALUE_OFFSET static void dissect_adap_indication_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item) { guint32 indication; indication = tvb_get_ntohl(parameter_tvb, ADAP_INDICATION_OFFSET); proto_tree_add_uint(parameter_tree, hf_sctp_adap_indication, parameter_tvb, ADAP_INDICATION_OFFSET, ADAP_INDICATION_LENGTH, indication); proto_item_set_text(parameter_item, "Adaptation layer indication"); } static 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")); } static void dissect_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, 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_text(chunk_tree, parameter_tvb, PARAMETER_HEADER_OFFSET, total_length, "%s parameter", val_to_str(type, sctp_parameter_identifier_values, "Unknown")); parameter_tree = proto_item_add_subtree(parameter_item, ett_sctp_chunk_parameter); proto_tree_add_uint(parameter_tree, hf_sctp_chunk_parameter_type, parameter_tvb, PARAMETER_TYPE_OFFSET, PARAMETER_TYPE_LENGTH, type); 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, pinfo, 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; case UNRELIABLE_STREAMS_PARAMETER_ID: dissect_unreliable_streams_parameter(parameter_tvb, parameter_tree, parameter_item); break; case ADD_IP_ADDRESS_PARAMETER_ID: dissect_add_ip_address_parameter(parameter_tvb, pinfo, parameter_tree, parameter_item); break; case DEL_IP_ADDRESS_PARAMETER_ID: dissect_del_ip_address_parameter(parameter_tvb, pinfo, parameter_tree, parameter_item); break; case ERROR_CAUSE_INDICATION_PARAMETER_ID: dissect_error_cause_indication_parameter(parameter_tvb, pinfo, parameter_tree, parameter_item); break; case SET_PRIMARY_ADDRESS_PARAMETER_ID: dissect_set_primary_address_parameter(parameter_tvb, pinfo, parameter_tree, parameter_item); break; case SUCCESS_REPORT_PARAMETER_ID: dissect_success_report_parameter(parameter_tvb, parameter_tree, parameter_item); break; case ADAP_LAYER_INDICATION_PARAMETER_ID: dissect_adap_indication_parameter(parameter_tvb, parameter_tree, parameter_item); break; default: dissect_unknown_parameter(parameter_tvb, parameter_tree, parameter_item); break; }; if ((padding_length > 0) && (type != UNREC_PARA_PARAMETER_ID)) 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 */ static 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); } static 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(cause_tree, hf_sctp_cause_missing_parameter_type, cause_tvb, offset, CAUSE_MISSING_PARAMETER_TYPE_LENGTH, parameter_type); 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") ); } static 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); } static 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"); } static void dissect_unresolvable_address_cause(tvbuff_t *cause_tvb, packet_info *pinfo, 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, pinfo, 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 0x%04x (%s)", parameter_type, val_to_str(parameter_type, sctp_parameter_identifier_values, "unknown") ); } static void dissect_unrecognized_chunk_type_cause(tvbuff_t *cause_tvb, packet_info *pinfo, 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, pinfo, cause_tree,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")); } static 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"); } static void dissect_unrecognized_parameters_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *cause_tree, proto_item *cause_item) { guint16 length, padding_length, cause_info_length; tvbuff_t *unrecognized_parameters_tvb; length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET); padding_length = nr_of_padding_bytes(length); cause_info_length = length - CAUSE_HEADER_LENGTH + padding_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, pinfo, cause_tree); proto_item_set_text(cause_item, "Error cause reporting unrecognized parameters"); } static 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); } static 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"); } static void dissect_delete_last_address_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *cause_tree, proto_item *cause_item) { guint16 length, cause_info_length; tvbuff_t *parameter_tvb; length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET); cause_info_length = length - CAUSE_HEADER_LENGTH; parameter_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, cause_info_length); dissect_parameter(parameter_tvb, pinfo, cause_tree); proto_item_set_text(cause_item, "Delete last address cause"); } static void dissect_resource_outage_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *cause_tree, proto_item *cause_item) { guint16 length, cause_info_length; tvbuff_t *parameter_tvb; length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET); cause_info_length = length - CAUSE_HEADER_LENGTH; parameter_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, cause_info_length); dissect_parameter(parameter_tvb, pinfo, cause_tree); proto_item_set_text(cause_item, "Operation refused due to resource shortage"); } static void dissect_delete_source_address_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *cause_tree, proto_item *cause_item) { guint16 length, cause_info_length; tvbuff_t *parameter_tvb; length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET); cause_info_length = length - CAUSE_HEADER_LENGTH; parameter_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, cause_info_length); dissect_parameter(parameter_tvb, pinfo, cause_tree); proto_item_set_text(cause_item, "Delete source address cause"); } static 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")); } static void dissect_error_cause(tvbuff_t *cause_tvb, packet_info *pinfo, 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_text(chunk_tree, cause_tvb, CAUSE_HEADER_OFFSET, total_length, "BAD ERROR CAUSE"); cause_tree = proto_item_add_subtree(cause_item, ett_sctp_chunk_cause); proto_tree_add_uint(cause_tree, hf_sctp_cause_code, cause_tvb, CAUSE_CODE_OFFSET, CAUSE_CODE_LENGTH, code); 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, pinfo, cause_tree, cause_item); break; case UNRECOGNIZED_CHUNK_TYPE: dissect_unrecognized_chunk_type_cause(cause_tvb, pinfo, 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, pinfo, 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; case REQUEST_TO_DELETE_LAST_ADDRESS: dissect_delete_last_address_cause(cause_tvb, pinfo, cause_tree, cause_item); break; case OPERATION_REFUSED_DUE_TO_RESOURCE_SHORTAGE: dissect_resource_outage_cause(cause_tvb, pinfo, cause_tree, cause_item); break; case REQUEST_TO_DELETE_SOURCE_ADDRESS: dissect_delete_source_address_cause(cause_tvb, pinfo, cause_tree, cause_item); break; default: dissect_unknown_cause(cause_tvb, cause_tree, cause_item); break; }; if ((padding_length > 0) && (code != UNRECOGNIZED_PARAMETERS)) 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 gboolean dissect_payload(tvbuff_t *payload_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, guint32 ppi, guint16 payload_length, guint16 padding_length) { /* do lookup with the subdissector table */ if (dissector_try_port (sctp_ppi_dissector_table, ppi, payload_tvb, pinfo, tree) || dissector_try_port(sctp_port_dissector_table, pinfo->srcport, payload_tvb, pinfo, tree) || dissector_try_port(sctp_port_dissector_table, pinfo->destport, payload_tvb, pinfo, tree)){ return TRUE; } else { if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "DATA "); proto_tree_add_text(chunk_tree, payload_tvb, 0, payload_length, "Payload (%u byte%s)", payload_length, plurality(payload_length, "", "s")); if (padding_length > 0) proto_tree_add_text(chunk_tree, payload_tvb, payload_length, padding_length, "Padding: %u byte%s", padding_length, plurality(padding_length, "", "s")); return FALSE; } } static gboolean dissect_data_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint8 flags; guint16 length, total_payload_length, payload_length, padding_length, stream_id, stream_seq_number; guint32 tsn, payload_proto_id; proto_tree *flag_tree; tvbuff_t *payload_tvb; length = tvb_get_ntohs(chunk_tvb, CHUNK_LENGTH_OFFSET); payload_length = length - DATA_CHUNK_HEADER_LENGTH; padding_length = nr_of_padding_bytes(length); total_payload_length = payload_length + padding_length; payload_tvb = tvb_new_subset(chunk_tvb, DATA_CHUNK_PAYLOAD_OFFSET, total_payload_length, total_payload_length); payload_proto_id = tvb_get_ntohl(chunk_tvb, DATA_CHUNK_PAYLOAD_PROTOCOL_ID_OFFSET); if (chunk_tree) { flags = tvb_get_guint8(chunk_tvb, CHUNK_FLAGS_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); 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_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")); }; return dissect_payload(payload_tvb, pinfo, tree, chunk_tree, payload_proto_id, payload_length, padding_length); } static void dissect_init_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, 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); if (check_col(pinfo->cinfo, COL_INFO)) { if (type == SCTP_INIT_CHUNK_ID) { col_append_str(pinfo->cinfo, COL_INFO, "INIT "); } else { col_append_str(pinfo->cinfo, COL_INFO, "INIT_ACK "); }; }; if (chunk_tree) { 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, pinfo, 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")); } } static void dissect_init_ack_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { dissect_init_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); } static void dissect_sack_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, 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; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "SACK "); if (chunk_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")); } } static void dissect_heartbeat_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, 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; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "HEARTBEAT "); if (chunk_tree) { 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, pinfo, chunk_tree); proto_item_set_text(chunk_item, "HEARTBEAT chunk"); } } static void dissect_heartbeat_ack_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, 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; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "HEARTBEAT_ACK "); if (chunk_tree) { 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, pinfo, chunk_tree); proto_item_set_text(chunk_item, "HEARTBEAT ACK chunk"); } } static void dissect_abort_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, 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; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "ABORT "); if (chunk_tree) { number_of_causes = 0; offset = ABORT_CHUNK_FIRST_ERROR_CAUSE_OFFSET; while(tvb_reported_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, pinfo, 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")); } } static void dissect_shutdown_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint32 cumulative_tsn_ack; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "SHUTDOWN "); if (chunk_tree) { 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); } } static void dissect_shutdown_ack_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "SHUTDOWN_ACK "); if (chunk_tree) { proto_item_set_text(chunk_item, "SHUTDOWN ACK chunk"); } } static void dissect_error_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, 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; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "ERROR "); if (chunk_tree) { 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, pinfo, chunk_tree); /* get rid of the handled parameter */ offset += total_length; number_of_causes++; } while(tvb_reported_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")); } } static void dissect_cookie_echo_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, 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; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "COOKIE_ECHO "); if (chunk_tree) { 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")); } } static void dissect_cookie_ack_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "COOKIE_ACK "); if (chunk_tree) { proto_item_set_text(chunk_item, "COOKIE ACK chunk"); } } static void dissect_ecne_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint32 lowest_tsn; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "ECNE "); if (chunk_tree) { 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"); } } static void dissect_cwr_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint32 lowest_tsn; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "CWR "); if (chunk_tree) { 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"); } } static void dissect_shutdown_complete_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint8 flags; guint16 length; proto_tree *flag_tree; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "SHUTDOWN_COMPLETE "); if (chunk_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"); } } #define FORWARD_TSN_CHUNK_TSN_OFFSET CHUNK_VALUE_OFFSET #define FORWARD_TSN_CHUNK_TSN_LENGTH 4 static void dissect_forward_tsn_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint32 tsn; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "FORWARD TSN "); if (chunk_tree) { tsn = tvb_get_ntohl(chunk_tvb, FORWARD_TSN_CHUNK_TSN_OFFSET); proto_tree_add_uint(chunk_tree, hf_sctp_forward_tsn_chunk_tsn, chunk_tvb, FORWARD_TSN_CHUNK_TSN_OFFSET, FORWARD_TSN_CHUNK_TSN_LENGTH, tsn); proto_item_set_text(chunk_item, "FORWARD TSN chunk (new cumulative TSN %u)", tsn); } } #define SERIAL_NUMBER_LENGTH 4 #define CORRELATION_ID_LENGTH 4 #define ASCONF_RESERVED_LENGTH 3 #define ASCONF_ADDR_TYPE_LENGTH 1 #define ASCONF_ADDR_LENGTH 16 #define SERIAL_NUMBER_OFFSET PARAMETER_VALUE_OFFSET #define IP_V4_ADDRESS_TYPE 5 #define IP_V6_ADDRESS_TYPE 6 static const value_string sctp_address_type_values[] = { { IP_V4_ADDRESS_TYPE, "IP V4 address" }, { IP_V6_ADDRESS_TYPE, "IP V6 address" }, { 0, NULL } }; static void dissect_asconf_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint32 serial_number, correlation_id, ipv4_address; guint offset, length, padding_length, total_length; guint8 addr_type; tvbuff_t *parameter_tvb; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "ASCONF "); if (chunk_tree) { offset = SERIAL_NUMBER_OFFSET; serial_number = tvb_get_ntohl(chunk_tvb, offset); proto_tree_add_uint(chunk_tree, hf_sctp_asconf_serial, chunk_tvb, offset, SERIAL_NUMBER_LENGTH, serial_number); offset += SERIAL_NUMBER_LENGTH; proto_tree_add_bytes(chunk_tree, hf_sctp_asconf_reserved, chunk_tvb, offset, ASCONF_RESERVED_LENGTH, tvb_get_ptr(chunk_tvb, offset, ASCONF_RESERVED_LENGTH)); offset += ASCONF_RESERVED_LENGTH; addr_type = tvb_get_guint8(chunk_tvb, offset); proto_tree_add_uint(chunk_tree, hf_sctp_asconf_addr_type, chunk_tvb, offset, ASCONF_ADDR_TYPE_LENGTH, addr_type); offset += ASCONF_ADDR_TYPE_LENGTH; switch (addr_type) { case IP_V4_ADDRESS_TYPE: tvb_memcpy(chunk_tvb, (guint8 *)&ipv4_address, offset, IPV4_ADDRESS_LENGTH); proto_tree_add_ipv4(chunk_tree, hf_sctp_asconf_ipv4_address, chunk_tvb, offset, IPV4_ADDRESS_LENGTH, ipv4_address); proto_tree_add_bytes(chunk_tree, hf_sctp_asconf_addr, chunk_tvb, offset + IPV4_ADDRESS_LENGTH, ASCONF_ADDR_LENGTH - IPV4_ADDRESS_LENGTH, tvb_get_ptr(chunk_tvb, offset + IPV4_ADDRESS_LENGTH, ASCONF_ADDR_LENGTH - IPV4_ADDRESS_LENGTH)); break; case IP_V6_ADDRESS_TYPE: proto_tree_add_ipv6(chunk_tree, hf_sctp_asconf_ipv6_address, chunk_tvb, offset, IPV6_ADDRESS_LENGTH, tvb_get_ptr(chunk_tvb, offset, IPV6_ADDRESS_LENGTH)); break; default: proto_tree_add_bytes(chunk_tree, hf_sctp_asconf_addr, chunk_tvb, offset, ASCONF_ADDR_LENGTH, tvb_get_ptr(chunk_tvb, offset, ASCONF_ADDR_LENGTH)); break; } offset += ASCONF_ADDR_LENGTH; proto_item_set_text(chunk_item, "ASCONF chunk"); while(tvb_reported_length_remaining(chunk_tvb, offset)) { correlation_id = tvb_get_ntohl(chunk_tvb, offset); proto_tree_add_uint(chunk_tree, hf_sctp_asconf_correlation_id, chunk_tvb, offset, CORRELATION_ID_LENGTH, correlation_id); offset += CORRELATION_ID_LENGTH; length = tvb_get_ntohs(chunk_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(chunk_tvb, offset, total_length, total_length); dissect_parameter(parameter_tvb, pinfo, chunk_tree); /* get rid of the handled parameter */ offset += total_length; } } } static void dissect_asconf_ack_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint32 serial_number, correlation_id; guint offset, length, padding_length, total_length; tvbuff_t *parameter_tvb; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "ASCONF-ACK "); if (chunk_tree) { serial_number = tvb_get_ntohl(chunk_tvb, SERIAL_NUMBER_OFFSET); proto_tree_add_uint(chunk_tree, hf_sctp_asconf_ack_serial, chunk_tvb, SERIAL_NUMBER_OFFSET, SERIAL_NUMBER_LENGTH, serial_number); proto_item_set_text(chunk_item, "ASCONF-ACK chunk"); offset = SERIAL_NUMBER_OFFSET + SERIAL_NUMBER_LENGTH; while(tvb_reported_length_remaining(chunk_tvb, offset)) { correlation_id = tvb_get_ntohl(chunk_tvb, offset); proto_tree_add_uint(chunk_tree, hf_sctp_asconf_ack_correlation_id, chunk_tvb, offset, CORRELATION_ID_LENGTH, correlation_id); offset += CORRELATION_ID_LENGTH; length = tvb_get_ntohs(chunk_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(chunk_tvb, offset, total_length, total_length); dissect_parameter(parameter_tvb, pinfo, chunk_tree); /* get rid of the handled parameter */ offset += total_length; } } } static void dissect_unknown_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item) { guint length, chunk_value_length, padding_length; guint8 type; if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "UNKNOWN "); if (chunk_tree) { 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")); } } static gboolean dissect_sctp_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *sctp_tree) { guint8 type, flags; guint16 length; gboolean result; proto_item *flags_item; proto_item *chunk_item; proto_tree *chunk_tree; result = FALSE; /* 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); if (tree) { /* create proto_tree stuff */ chunk_item = proto_tree_add_text(sctp_tree, chunk_tvb, CHUNK_HEADER_OFFSET, -1, "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(chunk_tree, hf_sctp_chunk_type, chunk_tvb, CHUNK_TYPE_OFFSET, CHUNK_TYPE_LENGTH, type); 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); } else { chunk_tree = NULL; chunk_item = NULL; flags_item = NULL; }; /* now dissect the chunk value */ switch(type) { case SCTP_DATA_CHUNK_ID: result = dissect_data_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_INIT_CHUNK_ID: dissect_init_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_INIT_ACK_CHUNK_ID: dissect_init_ack_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_SACK_CHUNK_ID: dissect_sack_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_HEARTBEAT_CHUNK_ID: dissect_heartbeat_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_HEARTBEAT_ACK_CHUNK_ID: dissect_heartbeat_ack_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_ABORT_CHUNK_ID: dissect_abort_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_SHUTDOWN_CHUNK_ID: dissect_shutdown_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_SHUTDOWN_ACK_CHUNK_ID: dissect_shutdown_ack_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_ERROR_CHUNK_ID: dissect_error_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_COOKIE_ECHO_CHUNK_ID: dissect_cookie_echo_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_COOKIE_ACK_CHUNK_ID: dissect_cookie_ack_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_ECNE_CHUNK_ID: dissect_ecne_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_CWR_CHUNK_ID: dissect_cwr_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_SHUTDOWN_COMPLETE_CHUNK_ID: dissect_shutdown_complete_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_FORWARD_TSN_CHUNK_ID: dissect_forward_tsn_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_ASCONF_ACK_CHUNK_ID: dissect_asconf_ack_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; case SCTP_ASCONF_CHUNK_ID: dissect_asconf_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; default: dissect_unknown_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item); break; }; return result; } static void dissect_sctp_chunks(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *sctp_item, proto_tree *sctp_tree) { tvbuff_t *chunk_tvb; guint16 length, padding_length, total_length; gint last_offset, offset; gboolean sctp_item_length_set; /* the common header of the datagram is already handled */ last_offset = 0; offset = COMMON_HEADER_LENGTH; sctp_item_length_set = FALSE; while(tvb_reported_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 */ if (dissect_sctp_chunk(chunk_tvb, pinfo, tree, sctp_tree) && (tree)) { proto_item_set_len(sctp_item, offset - last_offset + DATA_CHUNK_HEADER_LENGTH); sctp_item_length_set = TRUE; offset += total_length; last_offset = offset; if (tvb_reported_length_remaining(tvb, offset) > 0) { sctp_item = proto_tree_add_item(tree, proto_sctp, tvb, offset, -1, FALSE); sctp_tree = proto_item_add_subtree(sctp_item, ett_sctp); sctp_item_length_set = FALSE; } } else { /* get rid of the dissected chunk */ offset += total_length; } }; if (!sctp_item_length_set && (tree)) { proto_item_set_len(sctp_item, offset - last_offset); }; } /* 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, calculated_crc32c, calculated_adler32; guint length; gboolean crc32c_correct, adler32_correct; proto_item *sctp_item; proto_tree *sctp_tree; /* 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); /* update pi structure */ pinfo->ptype = PT_SCTP; pinfo->srcport = source_port; pinfo->destport = destination_port; /* make entry in the Protocol column on summary display */ if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "SCTP"); /* Clear entries in Info column on summary display */ if (check_col(pinfo->cinfo, COL_INFO)) col_add_str(pinfo->cinfo, COL_INFO, ""); /* 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 */ sctp_item = proto_tree_add_item(tree, proto_sctp, tvb, 0, -1, FALSE); sctp_tree = proto_item_add_subtree(sctp_item, 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_hidden(sctp_tree, hf_sctp_port, tvb, SOURCE_PORT_OFFSET, SOURCE_PORT_LENGTH, source_port); proto_tree_add_uint_hidden(sctp_tree, hf_sctp_port, tvb, DESTINATION_PORT_OFFSET, DESTINATION_PORT_LENGTH, destination_port); length = tvb_length(tvb); switch(sctp_checksum) { case SCTP_CHECKSUM_NONE: proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Checksum: 0x%08x (not verified)", checksum); break; case SCTP_CHECKSUM_ADLER32: calculated_adler32 = sctp_adler32(tvb_get_ptr(tvb, 0, length), length); adler32_correct = (checksum == calculated_adler32); if (adler32_correct) proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Checksum: 0x%08x (correct Adler32)", checksum); else proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Checksum: 0x%08x (incorrect Adler32, should be 0x%08x)", checksum, calculated_adler32); proto_tree_add_boolean_hidden(sctp_tree, hf_sctp_checksum_bad, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, !(adler32_correct)); break; case SCTP_CHECKSUM_CRC32C: calculated_crc32c = sctp_crc32c(tvb_get_ptr(tvb, 0, length), length); crc32c_correct = (checksum == calculated_crc32c); if (crc32c_correct) proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Checksum: 0x%08x (correct CRC32C)", checksum); else proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Checksum: 0x%08x (incorrect CRC32C, should be 0x%08x)", checksum, calculated_crc32c); proto_tree_add_boolean_hidden(sctp_tree, hf_sctp_checksum_bad, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, !(crc32c_correct)); break; case SCTP_CHECKSUM_AUTOMATIC: calculated_adler32 = sctp_adler32(tvb_get_ptr(tvb, 0, length), length); adler32_correct = (checksum == calculated_adler32); calculated_crc32c = sctp_crc32c(tvb_get_ptr(tvb, 0, length), length); crc32c_correct = (checksum == calculated_crc32c); if ((adler32_correct) && !(crc32c_correct)) proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Checksum: 0x%08x (correct Adler32)", checksum); else if (!(adler32_correct) && (crc32c_correct)) proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Checksum: 0x%08x (correct CRC32C)", checksum); else if ((adler32_correct) && (crc32c_correct)) proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Checksum: 0x%08x (correct Adler32 and CRC32C)", checksum); else proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Checksum: 0x%08x (incorrect, should be 0x%08x (Adler32) or 0x%08x (CRC32C))", checksum, calculated_adler32, calculated_crc32c); proto_tree_add_boolean_hidden(sctp_tree, hf_sctp_checksum_bad, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, !(crc32c_correct || adler32_correct)); break; } } else { sctp_tree = NULL; sctp_item = NULL; }; /* add all chunks of the sctp datagram to the protocol tree */ dissect_sctp_chunks(tvb, pinfo, tree, sctp_item, 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, "", HFILL } }, { &hf_sctp_destination_port, { "Destination port", "sctp.dstport", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_sctp_port, { "Port", "sctp.port", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_sctp_verification_tag, { "Verification tag", "sctp.verfication_tag", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } }, { &hf_sctp_checksum, { "Checksum", "sctp.checksum", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } }, { &hf_sctp_checksum_bad, { "Bad checksum", "sctp.checksum_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL } }, { &hf_sctp_chunk_type, { "Identifier", "sctp.chunk_type", FT_UINT8, BASE_DEC, VALS(sctp_chunk_type_values), 0x0, "", HFILL } }, { &hf_sctp_chunk_flags, { "Flags", "sctp.chunk_flags", FT_UINT8, BASE_BIN, NULL, 0x0, "", HFILL } }, { &hf_sctp_chunk_length, { "Length", "sctp.chunk_length", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_sctp_init_chunk_initiate_tag, { "Initiate tag", "sctp.init.chunk.initiate.tag", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } }, { &hf_sctp_init_chunk_adv_rec_window_credit, { "Advertised reciever window credit (a_rwnd)", "sctp.init.chunk.credit", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_sctp_init_chunk_number_of_outbound_streams, { "Number of outbound streams", "sctp.init.chunk.nr.out.streams", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_sctp_init_chunk_number_of_inbound_streams, { "Number of inbound streams", "sctp.init.chunk.nr.in.streams", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_init_chunk_initial_tsn, { "Initial TSN", "sctp.init.chunk.initial.tsn", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_cumulative_tsn_ack, { "Cumulative TSN Ack", "sctp.cumulative.tsn.ack", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_data_chunk_tsn, { "TSN", "sctp.tsn", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_data_chunk_stream_id, { "Stream Identifier", "sctp.stream_id", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL } }, {&hf_sctp_data_chunk_stream_seq_number, { "Stream sequence number", "sctp.stream_seq_number", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_data_chunk_payload_proto_id, { "Payload protocol identifier", "sctp.payload_proto_id", FT_UINT32, BASE_DEC, VALS(sctp_payload_proto_id_values), 0x0, "", HFILL } }, {&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, "", HFILL } }, {&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, "", HFILL } }, {&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, "", HFILL } }, {&hf_sctp_sack_chunk_cumulative_tsn_ack, { "Cumulative TSN ACK", "sctp.sack.cumulative_tsn_ack", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_sack_chunk_adv_rec_window_credit, { "Advertised receiver window credit (a_rwnd)", "sctp.sack.a_rwnd", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&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, "", HFILL } }, {&hf_sctp_sack_chunk_number_of_dup_tsns, { "Number of duplicated TSNs", "sctp.sack.number_of_duplicated_tsns", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_sack_chunk_gap_block_start, { "Start", "sctp.sack.gap_block_start", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_sack_chunk_gap_block_end, { "End", "sctp.sack.gap_block_end", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_sack_chunk_duplicate_tsn, { "Duplicate TSN", "sctp.sack.duplicate.tsn", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_shutdown_chunk_cumulative_tsn_ack, { "Cumulative TSN Ack", "sctp.shutdown.cumulative_tsn_ack", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_ecne_chunk_lowest_tsn, { "Lowest TSN", "sctp.ecne.lowest_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_cwr_chunk_lowest_tsn, { "Lowest TSN", "sctp.cwr.lowest_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&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, "", HFILL } }, {&hf_sctp_forward_tsn_chunk_tsn, { "New cumulative TSN", "sctp.forward_tsn.tsn", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_chunk_parameter_type, { "Parameter type", "sctp.parameter.type", FT_UINT16, BASE_HEX, VALS(sctp_parameter_identifier_values), 0x0, "", HFILL } }, {&hf_sctp_chunk_parameter_length, { "Parameter length", "sctp.parameter.length", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_parameter_ipv4_address, { "IP Version 4 address", "sctp.parameter.ipv4_address", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL } }, {&hf_sctp_parameter_ipv6_address, { "IP Version 6 address", "sctp.parameter.ipv6_address", FT_IPv6, BASE_NONE, NULL, 0x0, "", HFILL } }, {&hf_sctp_parameter_cookie_preservative_increment, { "Suggested Cookie life-span increment (msec)", "sctp.parameter.cookie_preservative_incr", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_parameter_hostname_hostname, { "Hostname", "sctp.parameter.hostname.hostname", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL } }, {&hf_sctp_supported_address_types_parameter, { "Supported address type", "sctp.parameter.supported_addres_type", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_ustreams_start, { "Start", "sctp.unreliable_streams.start", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_ustreams_end, { "End", "sctp.unreliable_streams.end", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_asconf_serial, { "Serial Number", "sctp.asconf.serial_number", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } }, {&hf_sctp_asconf_correlation_id, { "Correlation_id", "sctp.asconf.correlation_id", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } }, {&hf_sctp_asconf_reserved, { "Reserved", "sctp.asconf.reserved", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL } }, {&hf_sctp_asconf_addr_type, { "Address type", "sctp.asconf.address_type", FT_UINT8, BASE_HEX, VALS(sctp_address_type_values), 0x0, "", HFILL } }, {&hf_sctp_asconf_addr, { "Address bytes", "sctp.asconf.address_bytes", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL } }, {&hf_sctp_asconf_ipv4_address, { "IP Version 4 address", "sctp.asconf.ipv4_address", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL } }, {&hf_sctp_asconf_ipv6_address, { "IP Version 6 address", "sctp.asconf.ipv6_address", FT_IPv6, BASE_NONE, NULL, 0x0, "", HFILL } }, {&hf_sctp_asconf_ack_serial, { "Serial Number", "sctp.asconf_ack.serial_number", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } }, {&hf_sctp_asconf_ack_correlation_id, { "Correlation_id", "sctp.asconf_ack.correlation_id", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } }, {&hf_sctp_adap_indication, { "Indication", "sctp.adapation_layer_indication.indication", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } }, {&hf_sctp_cause_code, { "Cause code", "sctp.cause.code", FT_UINT16, BASE_HEX, VALS(sctp_cause_code_values), 0x0, "", HFILL } }, {&hf_sctp_cause_length, { "Cause length", "sctp.cause.length", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_cause_stream_identifier, { "Stream identifier", "sctp.cause.stream_identifier", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_cause_number_of_missing_parameters, { "Number of missing parameters", "sctp.cause.nr_of_missing_parameters", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_cause_missing_parameter_type, { "Missing parameter type", "sctp.cause.missing_parameter_type", FT_UINT16, BASE_HEX, VALS(sctp_parameter_identifier_values), 0x0, "", HFILL } }, {&hf_sctp_cause_measure_of_staleness, { "Measure of staleness in usec", "sctp.cause.measure_of_staleness", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, {&hf_sctp_cause_tsn, { "TSN", "sctp.cause.tsn", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, }; /* 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, &ett_sctp_unreliable_streams_interval }; static enum_val_t sctp_checksum_options[] = { { "None", SCTP_CHECKSUM_NONE }, { "Adler 32", SCTP_CHECKSUM_ADLER32 }, { "CRC 32c", SCTP_CHECKSUM_CRC32C }, { "Automatic", SCTP_CHECKSUM_AUTOMATIC}, { NULL, 0 } }; /* Register the protocol name and description */ proto_sctp = proto_register_protocol("Stream Control Transmission Protocol", "SCTP", "sctp"); sctp_module = prefs_register_protocol(proto_sctp, NULL); prefs_register_enum_preference(sctp_module, "checksum", "Checksum type", "The type of checksum used in SCTP packets", &sctp_checksum, sctp_checksum_options, FALSE); /* 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)); /* subdissector code */ sctp_port_dissector_table = register_dissector_table("sctp.port", "SCTP port", FT_UINT16, BASE_DEC); sctp_ppi_dissector_table = register_dissector_table("sctp.ppi", "SCTP payload protocol identifier", FT_UINT32, BASE_HEX); }; void proto_reg_handoff_sctp(void) { dissector_handle_t sctp_handle; sctp_handle = create_dissector_handle(dissect_sctp, proto_sctp); dissector_add("ip.proto", IP_PROTO_SCTP, sctp_handle); }