diff options
| -rw-r--r-- | AUTHORS | 4 | ||||
| -rw-r--r-- | Makefile.am | 3 | ||||
| -rw-r--r-- | doc/ethereal.pod.template | 1 | ||||
| -rw-r--r-- | packet-sctp.c | 1810 |
4 files changed, 1817 insertions, 1 deletions
@@ -343,6 +343,10 @@ Dug Song <dugsong@monkey.org> { RPCSEC_GSS credential/verifier dissection for ONC RPC } +Tuexen Michael <Michael.Tuexen@icn.siemens.de> { + SCTP +} + Alain Magloire <alainm@rcsm.ece.mcgill.ca> was kind enough to give his permission to use his version of snprintf.c. diff --git a/Makefile.am b/Makefile.am index f480fc72d5..1dd2e69c2b 100644 --- a/Makefile.am +++ b/Makefile.am @@ -1,7 +1,7 @@ # Makefile.am # Automake file for Ethereal # -# $Id: Makefile.am,v 1.209 2000/07/14 07:11:51 guy Exp $ +# $Id: Makefile.am,v 1.210 2000/07/21 12:56:57 gram Exp $ # # Ethereal - Network traffic analyzer # By Gerald Combs <gerald@zing.org> @@ -123,6 +123,7 @@ DISSECTOR_SOURCES = \ packet-rtsp.c \ packet-rx.c \ packet-sap.c \ + packet-sctp.c \ packet-sdp.c \ packet-smb.c \ packet-smb-browse.c \ diff --git a/doc/ethereal.pod.template b/doc/ethereal.pod.template index 67b5f73e76..9cb783f71a 100644 --- a/doc/ethereal.pod.template +++ b/doc/ethereal.pod.template @@ -904,6 +904,7 @@ B<http://ethereal.zing.org>. Mark Clayton <clayton@shore.net> Michael Rozhavsky <mike@tochna.technion.ac.il> Dug Song <dugsong@monkey.org> + Tuexen Michael <Michael.Tuexen@icn.siemens.de> Alain Magloire <alainm@rcsm.ece.mcgill.ca> was kind enough to give his permission to use his version of snprintf.c. diff --git a/packet-sctp.c b/packet-sctp.c new file mode 100644 index 0000000000..4f5caf3f89 --- /dev/null +++ b/packet-sctp.c @@ -0,0 +1,1810 @@ +/* packet-sctp.c + * Routines for Stream Control Transmission Protocol dissection + * Copyright 2000, Michael Tüxen <Michael.Tuexen@icn.siemens.de> + * + * $Id: packet-sctp.c,v 1.1 2000/07/21 12:56:58 gram Exp $ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@unicom.net> + * 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 <stdio.h> +#include <stdlib.h> + + +#ifdef HAVE_SYS_TYPES_H +# include <sys/types.h> +#endif + +#ifdef HAVE_NETINET_IN_H +# include <netinet/in.h> +#endif + +#ifdef NEED_SNPRINTF_H +# ifdef HAVE_STDARG_H +# include <stdarg.h> +# else +# include <varargs.h> +# endif +# include "snprintf.h" +#endif + +#include <string.h> +#include <glib.h> +#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 +*/ + +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. + */ + +#if 0 +static void +dissect_sctp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ +#else +static void +dissect_sctp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) +{ + tvbuff_t *tvb = tvb_create_from_top(offset); + packet_info *pinfo = π +#endif + + 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(fd, COL_PROTOCOL)) + col_add_str(fd, COL_PROTOCOL, "SCTP"); + + /* Make entries in Info column on summary display */ + if (check_col(fd, COL_INFO)) + col_add_fstr(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); +} + + + + + + + |