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wireshark/packet-sctp.c

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/* packet-sctp.c
* Routines for Stream Control Transmission Protocol dissection
* Copyright 2000, Michael Tüxen <Michael.Tuexen@icn.siemens.de>
*
* $Id: packet-sctp.c,v 1.6 2000/08/19 08:37:36 guy 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
#include <string.h>
#include <glib.h>
#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif
#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;
static dissector_table_t sctp_dissector_table;
/* 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 *, packet_info *, proto_tree *, 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, 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"));
}
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, 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_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, 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, cause_tree, cause_item);
break;
case NO_USER_DATA:
dissect_no_user_data_cause(cause_tvb, cause_tree, cause_item);
break;
case COOKIE_RECEIVED_WHILE_SHUTTING_DOWN:
dissect_cookie_received_while_shutting_down_cause(cause_tvb, cause_tree, cause_item);
break;
default:
dissect_unknown_cause(cause_tvb, cause_tree, cause_item);
break;
};
if (padding_length > 0)
proto_tree_add_text(cause_tree, cause_tvb, CAUSE_HEADER_OFFSET + length, padding_length,
"Padding: %u byte%s",
padding_length, plurality(padding_length, "", "s"));
}
/*
* Code to actually dissect the packets
*/
static void
dissect_payload(tvbuff_t *payload_tvb, packet_info *pinfo, proto_tree *tree,
proto_tree *chunk_tree, guint16 payload_length, guint16 padding_length)
{
/* do lookup with the subdissector table */
if (dissector_try_port(sctp_dissector_table, pi.srcport, payload_tvb, pinfo, tree) ||
dissector_try_port(sctp_dissector_table, pi.destport, payload_tvb, pinfo, tree))
return;
else {
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"));
}
}
static void
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;
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);
total_payload_length = payload_length + padding_length;
payload_tvb = tvb_new_subset(chunk_tvb, DATA_CHUNK_PAYLOAD_OFFSET,
total_payload_length, total_payload_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_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"));
dissect_payload(payload_tvb, pinfo, tree, chunk_tree, payload_length, padding_length);
}
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);
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, 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);
}
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;
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, 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;
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, 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;
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, 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;
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, 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"));
}
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;
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, packet_info *pinfo, proto_tree *tree,
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, 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;
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_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, 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;
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, packet_info *pinfo, proto_tree *tree,
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, packet_info *pinfo, proto_tree *tree,
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, packet_info *pinfo, proto_tree *tree,
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, 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;
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, 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;
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, packet_info *pinfo, proto_tree *tree, 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, 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;
default:
dissect_unknown_chunk(chunk_tvb, pinfo, tree, chunk_tree, chunk_item, flags_item);
break;
}
}
void
dissect_sctp_chunks(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, 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, pinfo, tree, sctp_tree);
/* get rid of the dissected chunk */
offset += total_length;
}
}
/* dissect_sctp handles the common header of a SCTP datagram.
* For the handling of the chunks dissect_sctp_chunks is called.
*/
static void
dissect_sctp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint16 source_port, destination_port;
guint32 verification_tag, checksum;
proto_item *ti;
proto_tree *sctp_tree;
CHECK_DISPLAY_AS_DATA(proto_sctp, tvb, pinfo, 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);
/* update pi structure */
pi.ptype = PT_SCTP;
pi.srcport = source_port;
pi.destport = destination_port;
/* make entry in the Protocol column on summary display */
if (check_col(pinfo->fd, COL_PROTOCOL))
col_add_str(pinfo->fd, COL_PROTOCOL, "SCTP");
/* Make entries in Info column on summary display */
if (check_col(pinfo->fd, COL_INFO))
col_add_fstr(pinfo->fd, COL_INFO, "%u > %u: tag 0x%x",
source_port, destination_port, verification_tag);
/* In the interest of speed, if "tree" is NULL, don't do any work not
necessary to generate protocol tree items. */
if (tree) {
/* create the sctp protocol tree */
ti = proto_tree_add_protocol_format(tree, proto_sctp, tvb, 0, tvb_length(tvb),
"Stream Control Transmission Protocol");
sctp_tree = proto_item_add_subtree(ti, ett_sctp);
/* add the components of the common header to the protocol tree */
proto_tree_add_uint(sctp_tree, hf_sctp_source_port,
tvb, SOURCE_PORT_OFFSET, SOURCE_PORT_LENGTH,
source_port);
proto_tree_add_uint(sctp_tree, hf_sctp_destination_port,
tvb, DESTINATION_PORT_OFFSET, DESTINATION_PORT_LENGTH,
destination_port);
proto_tree_add_uint(sctp_tree, hf_sctp_verification_tag,
tvb, VERIFICATION_TAG_OFFSET, VERIFICATION_TAG_LENGTH,
verification_tag);
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum,
tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum,
"Adler-32 checksum: 0x%08x (%s)",
checksum, sctp_checksum_state(tvb, checksum));
/* add all chunks of the sctp datagram to the protocol tree */
dissect_sctp_chunks(tvb, pinfo, tree, 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));
/* subdissector code */
sctp_dissector_table = register_dissector_table("sctp.port");
};
void
proto_reg_handoff_sctp(void)
{
dissector_add("ip.proto", IP_PROTO_SCTP, dissect_sctp);
}
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