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wireshark/packet-asap.c

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/* packet-asap.c
* Routines for Aggregate Server Access Protocol
* It is hopefully (needs testing) compilant to
* http://www.ietf.org/internet-drafts/draft-ietf-rserpool-common-param-02.txt
* http://www.ietf.org/internet-drafts/draft-ietf-rserpool-asap-05.txt
*
* Copyright 2002, Michael Tuexen <tuexen [AT] fh-muenster.de>
*
* $Id: packet-asap.c,v 1.11 2003/12/21 05:51:32 jmayer Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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 <epan/packet.h>
#include "sctpppids.h"
/* Initialize the protocol and registered fields */
static int proto_asap = -1;
static int hf_cause_code = -1;
static int hf_cause_length = -1;
static int hf_cause_info = -1;
static int hf_cause_padding = -1;
static int hf_message_type = -1;
static int hf_message_flags = -1;
static int hf_message_length = -1;
static int hf_parameter_type = -1;
static int hf_parameter_length = -1;
static int hf_parameter_value = -1;
static int hf_parameter_padding = -1;
static int hf_parameter_ipv4_address = -1;
static int hf_parameter_ipv6_address = -1;
static int hf_sctp_port = -1;
static int hf_sctp_reserved = -1;
static int hf_tcp_port = -1;
static int hf_tcp_reserved = -1;
static int hf_udp_port = -1;
static int hf_udp_reserved = -1;
static int hf_policy_type = -1;
static int hf_policy_value = -1;
static int hf_pool_handle = -1;
static int hf_pe_pe_identifier = -1;
static int hf_home_enrp_id = -1;
static int hf_reg_life = -1;
static int hf_server_identifier = -1;
static int hf_m_bit = -1;
static int hf_reserved = -1;
static int hf_cookie = -1;
static int hf_pe_identifier = -1;
/* Initialize the subtree pointers */
static gint ett_asap = -1;
static gint ett_asap_parameter = -1;
static gint ett_asap_cause = -1;
static void
dissect_parameters(tvbuff_t *, proto_tree *);
#define NETWORK_BYTE_ORDER FALSE
#define ADD_PADDING(x) ((((x) + 3) >> 2) << 2)
/* Dissectors for error causes */
#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)
static void
dissect_unknown_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item)
{
guint16 code, length, cause_info_length;
code = tvb_get_ntohs(cause_tvb, CAUSE_CODE_OFFSET);
length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET);
cause_info_length = length - CAUSE_HEADER_LENGTH;
if (cause_info_length > 0)
proto_tree_add_bytes(cause_tree, hf_cause_info, cause_tvb, CAUSE_INFO_OFFSET, cause_info_length,
tvb_get_ptr(cause_tvb, CAUSE_INFO_OFFSET, cause_info_length));
proto_item_append_text(cause_item, " (code %u and %u byte%s information)", code, cause_info_length, plurality(cause_info_length, "", "s"));
}
#define UNRECOGNIZED_PARAMETER_CAUSE_CODE 1
#define UNRECONGNIZED_MESSAGE_CAUSE_CODE 2
#define INVALID_VALUES 3
#define NON_UNIQUE_PE_IDENTIFIER 4
#define POOLING_POLICY_INCONSISTENT_CAUSE_CODE 5
#define LACK_OF_RESOURCES_CAUSE_CODE 6
static const value_string cause_code_values[] = {
{ UNRECOGNIZED_PARAMETER_CAUSE_CODE, "Unrecognized parameter" },
{ UNRECONGNIZED_MESSAGE_CAUSE_CODE, "Unrecognized message" },
{ INVALID_VALUES, "Invalid values" },
{ NON_UNIQUE_PE_IDENTIFIER, "Non-unique PE identifier" },
{ POOLING_POLICY_INCONSISTENT_CAUSE_CODE, "Pooling policy inconsistent" },
{ LACK_OF_RESOURCES_CAUSE_CODE, "Lack of resources" },
{ 0, NULL } };
static void
dissect_error_cause(tvbuff_t *cause_tvb, proto_tree *parameter_tree)
{
guint16 code, length, padding_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 = tvb_length(cause_tvb) - length;
cause_item = proto_tree_add_text(parameter_tree, cause_tvb, CAUSE_HEADER_OFFSET, tvb_length(cause_tvb), val_to_str(code, cause_code_values, "Unknown error cause"));
cause_tree = proto_item_add_subtree(cause_item, ett_asap_cause);
proto_tree_add_item(cause_tree, hf_cause_code, cause_tvb, CAUSE_CODE_OFFSET, CAUSE_CODE_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(cause_tree, hf_cause_length, cause_tvb, CAUSE_LENGTH_OFFSET, CAUSE_LENGTH_LENGTH, NETWORK_BYTE_ORDER);
switch(code) {
default:
dissect_unknown_cause(cause_tvb, cause_tree, cause_item);
break;
}
if (padding_length > 0)
proto_tree_add_item(cause_tree, hf_cause_padding, cause_tvb, CAUSE_HEADER_OFFSET + length, padding_length, NETWORK_BYTE_ORDER);
}
static void
dissect_error_causes(tvbuff_t *error_causes_tvb, proto_tree *parameter_tree)
{
guint16 length, total_length;
gint offset;
tvbuff_t *error_cause_tvb;
offset = 0;
while(tvb_reported_length_remaining(error_causes_tvb, offset)) {
length = tvb_get_ntohs(error_causes_tvb, offset + CAUSE_LENGTH_OFFSET);
total_length = ADD_PADDING(length);
error_cause_tvb = tvb_new_subset(error_causes_tvb, offset , total_length, total_length);
dissect_error_cause(error_cause_tvb, parameter_tree);
offset += total_length;
}
}
/* Dissectors for parameters */
#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 IPV4_ADDRESS_LENGTH 4
#define IPV4_ADDRESS_OFFSET PARAMETER_VALUE_OFFSET
static void
dissect_ipv4_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
proto_tree_add_item(parameter_tree, hf_parameter_ipv4_address, parameter_tvb, IPV4_ADDRESS_OFFSET, IPV4_ADDRESS_LENGTH, NETWORK_BYTE_ORDER);
proto_item_append_text(parameter_item, " (%s)", ip_to_str((const guint8 *)tvb_get_ptr(parameter_tvb, IPV4_ADDRESS_OFFSET, IPV4_ADDRESS_LENGTH)));
}
#define IPV6_ADDRESS_LENGTH 16
#define IPV6_ADDRESS_OFFSET PARAMETER_VALUE_OFFSET
static void
dissect_ipv6_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
proto_tree_add_item(parameter_tree, hf_parameter_ipv6_address, parameter_tvb, IPV6_ADDRESS_OFFSET, IPV6_ADDRESS_LENGTH, NETWORK_BYTE_ORDER);
proto_item_append_text(parameter_item, " (%s)", ip6_to_str((const struct e_in6_addr *)tvb_get_ptr(parameter_tvb, IPV6_ADDRESS_OFFSET, IPV6_ADDRESS_LENGTH)));
}
#define SCTP_PORT_LENGTH 2
#define SCTP_RESERVED_LENGTH 2
#define SCTP_PORT_OFFSET PARAMETER_VALUE_OFFSET
#define SCTP_RESERVED_OFFSET (SCTP_PORT_OFFSET + SCTP_PORT_LENGTH)
#define SCTP_ADDRESS_OFFSET (SCTP_RESERVED_OFFSET + SCTP_RESERVED_LENGTH)
static void
dissect_sctp_transport_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
{
tvbuff_t *parameters_tvb;
proto_tree_add_item(parameter_tree, hf_sctp_port, parameter_tvb, SCTP_PORT_OFFSET, SCTP_PORT_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(parameter_tree, hf_sctp_reserved, parameter_tvb, SCTP_RESERVED_OFFSET, SCTP_RESERVED_LENGTH, NETWORK_BYTE_ORDER);
parameters_tvb = tvb_new_subset(parameter_tvb, SCTP_ADDRESS_OFFSET, -1, -1);
dissect_parameters(parameters_tvb, parameter_tree);
}
#define TCP_PORT_LENGTH 2
#define TCP_RESERVED_LENGTH 2
#define TCP_PORT_OFFSET PARAMETER_VALUE_OFFSET
#define TCP_RESERVED_OFFSET (TCP_PORT_OFFSET + TCP_PORT_LENGTH)
#define TCP_ADDRESS_OFFSET (TCP_RESERVED_OFFSET + TCP_RESERVED_LENGTH)
static void
dissect_tcp_transport_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
{
tvbuff_t *parameters_tvb;
proto_tree_add_item(parameter_tree, hf_tcp_port, parameter_tvb, TCP_PORT_OFFSET, TCP_PORT_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(parameter_tree, hf_tcp_reserved, parameter_tvb, TCP_RESERVED_OFFSET, TCP_RESERVED_LENGTH, NETWORK_BYTE_ORDER);
parameters_tvb = tvb_new_subset(parameter_tvb, TCP_ADDRESS_OFFSET, -1, -1);
dissect_parameters(parameters_tvb, parameter_tree);
}
#define UDP_PORT_LENGTH 2
#define UDP_RESERVED_LENGTH 2
#define UDP_PORT_OFFSET PARAMETER_VALUE_OFFSET
#define UDP_RESERVED_OFFSET (UDP_PORT_OFFSET + UDP_PORT_LENGTH)
#define UDP_ADDRESS_OFFSET (UDP_RESERVED_OFFSET + UDP_RESERVED_LENGTH)
static void
dissect_udp_transport_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
{
tvbuff_t *parameters_tvb;
proto_tree_add_item(parameter_tree, hf_udp_port, parameter_tvb, UDP_PORT_OFFSET, UDP_PORT_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(parameter_tree, hf_udp_reserved, parameter_tvb, UDP_RESERVED_OFFSET, UDP_RESERVED_LENGTH, NETWORK_BYTE_ORDER);
parameters_tvb = tvb_new_subset(parameter_tvb, UDP_ADDRESS_OFFSET, -1, -1);
dissect_parameters(parameters_tvb, parameter_tree);
}
#define POLICY_TYPE_LENGTH 1
#define POLICY_VALUE_LENGTH 3
#define POLICY_TYPE_OFFSET PARAMETER_VALUE_OFFSET
#define POLICY_VALUE_OFFSET (POLICY_TYPE_OFFSET + POLICY_TYPE_LENGTH)
#define ROUND_ROBIN_POLICY 1
#define LEAST_USED_POLICY 2
#define LEAST_USED_WITH_DEG 3
#define WEIGHTED_ROUND_ROBIN 4
static const value_string policy_type_values[] = {
{ ROUND_ROBIN_POLICY, "Round robin" },
{ LEAST_USED_POLICY, "Least used" },
{ LEAST_USED_WITH_DEG, "Least used with degradation" },
{ WEIGHTED_ROUND_ROBIN, "Weighted round robin" },
{ 0, NULL } };
static void
dissect_pool_member_selection_policy_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
{
proto_tree_add_item(parameter_tree, hf_policy_type, parameter_tvb, POLICY_TYPE_OFFSET, POLICY_TYPE_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(parameter_tree, hf_policy_value, parameter_tvb, POLICY_VALUE_OFFSET, POLICY_VALUE_LENGTH, NETWORK_BYTE_ORDER);
}
#define POOL_HANDLE_OFFSET PARAMETER_VALUE_OFFSET
static void
dissect_pool_handle_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
{
guint16 handle_length;
handle_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
proto_tree_add_item(parameter_tree, hf_pool_handle, parameter_tvb, POOL_HANDLE_OFFSET, handle_length, NETWORK_BYTE_ORDER);
}
#define PE_PE_IDENTIFIER_LENGTH 4
#define HOME_ENRP_INDENTIFIER_LENGTH 4
#define REGISTRATION_LIFE_LENGTH 4
#define PE_PE_IDENTIFIER_OFFSET PARAMETER_VALUE_OFFSET
#define HOME_ENRP_INDENTIFIER_OFFSET (PE_PE_IDENTIFIER_OFFSET + PE_PE_IDENTIFIER_LENGTH)
#define REGISTRATION_LIFE_OFFSET (HOME_ENRP_INDENTIFIER_OFFSET + HOME_ENRP_INDENTIFIER_LENGTH)
#define USER_TRANSPORT_PARAMETER_OFFSET (REGISTRATION_LIFE_OFFSET + REGISTRATION_LIFE_LENGTH)
static void
dissect_pool_element_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
{
tvbuff_t *parameters_tvb;
proto_tree_add_item(parameter_tree, hf_pe_pe_identifier, parameter_tvb, PE_PE_IDENTIFIER_OFFSET, PE_PE_IDENTIFIER_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(parameter_tree, hf_home_enrp_id, parameter_tvb, HOME_ENRP_INDENTIFIER_OFFSET, HOME_ENRP_INDENTIFIER_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(parameter_tree, hf_reg_life, parameter_tvb, REGISTRATION_LIFE_OFFSET, REGISTRATION_LIFE_LENGTH, NETWORK_BYTE_ORDER);
parameters_tvb = tvb_new_subset(parameter_tvb, USER_TRANSPORT_PARAMETER_OFFSET, -1, -1);
dissect_parameters(parameters_tvb, parameter_tree);
}
#define SERVER_ID_LENGTH 4
#define RESERVED_LENGTH 4
#define SERVER_ID_OFFSET PARAMETER_VALUE_OFFSET
#define RESERVED_OFFSET (SERVER_ID_OFFSET + SERVER_ID_LENGTH)
#define SERVER_TRANSPORT_OFFSET (RESERVED_OFFSET + RESERVED_LENGTH)
#define M_BIT_MASK 0x80000000
#define RESERVED_MASK 0x7fffffff
static void
dissect_server_information_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
{
tvbuff_t *parameters_tvb;
proto_tree_add_item(parameter_tree, hf_server_identifier, parameter_tvb, SERVER_ID_OFFSET, SERVER_ID_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(parameter_tree, hf_m_bit, parameter_tvb, RESERVED_OFFSET, RESERVED_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(parameter_tree, hf_reserved, parameter_tvb, RESERVED_OFFSET, RESERVED_LENGTH, NETWORK_BYTE_ORDER);
parameters_tvb = tvb_new_subset(parameter_tvb, SERVER_TRANSPORT_OFFSET, -1, -1);
dissect_parameters(parameters_tvb, parameter_tree);
}
#define ERROR_CAUSES_OFFSET PARAMETER_VALUE_OFFSET
static void
dissect_operation_error_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
{
tvbuff_t *error_causes_tvb;
error_causes_tvb = tvb_new_subset(parameter_tvb, ERROR_CAUSES_OFFSET, -1,-1);
dissect_error_causes(error_causes_tvb, parameter_tree);
}
#define COOKIE_OFFSET PARAMETER_VALUE_OFFSET
static void
dissect_cookie_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
guint16 cookie_length;
cookie_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
if (cookie_length > 0)
proto_tree_add_item(parameter_tree, hf_cookie, parameter_tvb, COOKIE_OFFSET, cookie_length, NETWORK_BYTE_ORDER);
proto_item_append_text(parameter_item, " (%u byte%s)", cookie_length, plurality(cookie_length, "", "s"));
}
#define PE_IDENTIFIER_LENGTH 4
#define PE_IDENTIFIER_OFFSET PARAMETER_VALUE_OFFSET
static void
dissect_pe_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
proto_tree_add_item(parameter_tree, hf_pe_identifier, parameter_tvb, PE_IDENTIFIER_OFFSET, PE_IDENTIFIER_LENGTH, NETWORK_BYTE_ORDER);
proto_item_append_text(parameter_item, " (0x%x)", tvb_get_ntohl(parameter_tvb, PE_IDENTIFIER_OFFSET));
}
static void
dissect_unknown_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
guint16 type, parameter_value_length;
type = tvb_get_ntohs(parameter_tvb, PARAMETER_TYPE_OFFSET);
parameter_value_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
if (parameter_value_length > 0)
proto_tree_add_item(parameter_tree, hf_parameter_value, parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, NETWORK_BYTE_ORDER);
proto_item_append_text(parameter_item, " (type %u and %u byte%s value)", type, parameter_value_length, plurality(parameter_value_length, "", "s"));
}
#define IPV4_ADDRESS_PARAMETER_TYPE 0x01
#define IPV6_ADDRESS_PARAMETER_TYPE 0x02
#define SCTP_TRANSPORT_PARAMETER_TYPE 0x03
#define TCP_TRANSPORT_PARAMETER_TYPE 0x04
#define UDP_TRANSPORT_PARAMETER_TYPE 0x05
#define POOL_MEMBER_SELECTION_POLICY_PARAMETER_TYPE 0x06
#define POOL_HANDLE_PARAMETER_TYPE 0x07
#define POOL_ELEMENT_PARAMETER_TYPE 0x08
#define SERVER_INFORMATION_PARAMETER_TYPE 0x09
#define OPERATION_ERROR_PARAMETER_TYPE 0x0a
#define COOKIE_PARAMETER_TYPE 0x0b
#define PE_IDENTIFIER_PARAMETER_TYPE 0x0c
static const value_string parameter_type_values[] = {
{ IPV4_ADDRESS_PARAMETER_TYPE, "IPV4 address" },
{ IPV6_ADDRESS_PARAMETER_TYPE, "IPV6 address" },
{ SCTP_TRANSPORT_PARAMETER_TYPE, "SCTP transport address" },
{ TCP_TRANSPORT_PARAMETER_TYPE, "TCP transport address" },
{ UDP_TRANSPORT_PARAMETER_TYPE, "UDP transport address" },
{ POOL_MEMBER_SELECTION_POLICY_PARAMETER_TYPE, "Pool member selection policy" },
{ POOL_HANDLE_PARAMETER_TYPE, "Pool handle" },
{ POOL_ELEMENT_PARAMETER_TYPE, "Pool element" },
{ SERVER_INFORMATION_PARAMETER_TYPE, "Server Information" },
{ OPERATION_ERROR_PARAMETER_TYPE, "Operation error" },
{ COOKIE_PARAMETER_TYPE, "Cookie" },
{ PE_IDENTIFIER_PARAMETER_TYPE, "Pool Element identifier" },
{ 0, NULL } };
static void
dissect_parameter(tvbuff_t *parameter_tvb, proto_tree *asap_tree)
{
guint16 type, length, padding_length;
proto_item *parameter_item;
proto_tree *parameter_tree;
/* extract tag and length from the parameter */
type = tvb_get_ntohs(parameter_tvb, PARAMETER_TYPE_OFFSET);
length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
padding_length = tvb_length(parameter_tvb) - length;
/* create proto_tree stuff */
parameter_item = proto_tree_add_text(asap_tree, parameter_tvb, PARAMETER_HEADER_OFFSET, tvb_length(parameter_tvb), val_to_str(type, parameter_type_values, "Unknown parameter"));
parameter_tree = proto_item_add_subtree(parameter_item, ett_asap_parameter);
/* add tag and length to the asap tree */
proto_tree_add_item(parameter_tree, hf_parameter_type, parameter_tvb, PARAMETER_TYPE_OFFSET, PARAMETER_TYPE_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(parameter_tree, hf_parameter_length, parameter_tvb, PARAMETER_LENGTH_OFFSET, PARAMETER_LENGTH_LENGTH, NETWORK_BYTE_ORDER);
switch(type) {
case IPV4_ADDRESS_PARAMETER_TYPE:
dissect_ipv4_parameter(parameter_tvb, parameter_tree, parameter_item);
break;
case IPV6_ADDRESS_PARAMETER_TYPE:
dissect_ipv6_parameter(parameter_tvb, parameter_tree, parameter_item);
break;
case SCTP_TRANSPORT_PARAMETER_TYPE:
dissect_sctp_transport_parameter(parameter_tvb, parameter_tree);
break;
case TCP_TRANSPORT_PARAMETER_TYPE:
dissect_tcp_transport_parameter(parameter_tvb, parameter_tree);
break;
case UDP_TRANSPORT_PARAMETER_TYPE:
dissect_udp_transport_parameter(parameter_tvb, parameter_tree);
break;
case POOL_MEMBER_SELECTION_POLICY_PARAMETER_TYPE:
dissect_pool_member_selection_policy_parameter(parameter_tvb, parameter_tree);
break;
case POOL_HANDLE_PARAMETER_TYPE:
dissect_pool_handle_parameter(parameter_tvb, parameter_tree);
break;
case POOL_ELEMENT_PARAMETER_TYPE:
dissect_pool_element_parameter(parameter_tvb, parameter_tree);
break;
case SERVER_INFORMATION_PARAMETER_TYPE:
dissect_server_information_parameter(parameter_tvb, parameter_tree);
break;
case OPERATION_ERROR_PARAMETER_TYPE:
dissect_operation_error_parameter(parameter_tvb, parameter_tree);
break;
case COOKIE_PARAMETER_TYPE:
dissect_cookie_parameter(parameter_tvb, parameter_tree, parameter_item);
break;
case PE_IDENTIFIER_PARAMETER_TYPE:
dissect_pe_identifier_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_item(parameter_tree, hf_parameter_padding, parameter_tvb, PARAMETER_HEADER_OFFSET + length, padding_length, NETWORK_BYTE_ORDER);
}
static void
dissect_parameters(tvbuff_t *parameters_tvb, proto_tree *tree)
{
gint offset, length, total_length, remaining_length;
tvbuff_t *parameter_tvb;
offset = 0;
while((remaining_length = tvb_length_remaining(parameters_tvb, offset))) {
length = tvb_get_ntohs(parameters_tvb, offset + PARAMETER_LENGTH_OFFSET);
total_length = ADD_PADDING(length);
if (remaining_length >= length)
total_length = MIN(total_length, remaining_length);
/* create a tvb for the parameter including the padding bytes */
parameter_tvb = tvb_new_subset(parameters_tvb, offset, total_length, total_length);
dissect_parameter(parameter_tvb, tree);
/* get rid of the handled parameter */
offset += total_length;
}
}
#define MESSAGE_TYPE_LENGTH 1
#define MESSAGE_FLAGS_LENGTH 1
#define MESSAGE_LENGTH_LENGTH 2
#define MESSAGE_TYPE_OFFSET 0
#define MESSAGE_FLAGS_OFFSET (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH)
#define MESSAGE_LENGTH_OFFSET (MESSAGE_FLAGS_OFFSET + MESSAGE_FLAGS_LENGTH)
#define MESSAGE_VALUE_OFFSET (MESSAGE_LENGTH_OFFSET + MESSAGE_LENGTH_LENGTH)
#define REGISTRATION_MESSAGE_TYPE 0x01
#define DEREGISTRATION_MESSAGE_TYPE 0x02
#define REGISTRATION_RESPONSE_MESSAGE_TYPE 0x03
#define DEREGISTRATION_RESPONSE_MESSAGE_TYPE 0x04
#define NAME_RESOLUTION_MESSAGE_TYPE 0x05
#define NAME_RESOLUTION_RESPONSE_MESSAGE_TYPE 0x06
#define ENDPOINT_KEEP_ALIVE_MESSAGE_TYPE 0x07
#define ENDPOINT_KEEP_ALIVE_ACK_MESSAGE_TYPE 0x08
#define ENDPOINT_UNREACHABLE_MESSAGE_TYPE 0x09
#define SERVER_ANNOUNCE_MESSAGE_TYPE 0x0a
#define COOKIE_MESSAGE_TYPE 0x0b
#define COOKIE_ECHO_MESSAGE_TYPE 0x0c
#define BUSINESS_CARD_MESSAGE_TYPE 0x0d
#define PEER_ERROR_MESSAGE_TYPE 0x0e
static const value_string message_type_values[] = {
{ REGISTRATION_MESSAGE_TYPE, "Registration" },
{ DEREGISTRATION_MESSAGE_TYPE, "Deregistration" },
{ REGISTRATION_RESPONSE_MESSAGE_TYPE, "Registration response" },
{ DEREGISTRATION_RESPONSE_MESSAGE_TYPE, "Deregistration response" },
{ NAME_RESOLUTION_MESSAGE_TYPE, "Name resolution" },
{ NAME_RESOLUTION_RESPONSE_MESSAGE_TYPE, "Name resolution response" },
{ ENDPOINT_KEEP_ALIVE_MESSAGE_TYPE, "Endpoint keep alive" },
{ ENDPOINT_KEEP_ALIVE_ACK_MESSAGE_TYPE, "Endpoint keep alive acknowledgement" },
{ ENDPOINT_UNREACHABLE_MESSAGE_TYPE, "Endpoint unreachable" },
{ SERVER_ANNOUNCE_MESSAGE_TYPE, "Server announce" },
{ COOKIE_MESSAGE_TYPE, "Cookie" },
{ COOKIE_ECHO_MESSAGE_TYPE, "Cookie echo" },
{ BUSINESS_CARD_MESSAGE_TYPE, "Business card" },
{ PEER_ERROR_MESSAGE_TYPE, "Peer error" },
{ 0, NULL } };
static void
dissect_asap_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *asap_tree)
{
tvbuff_t *parameters_tvb;
if (check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str(tvb_get_guint8(message_tvb, MESSAGE_TYPE_OFFSET), message_type_values, "Unknown ASAP type"));
if (asap_tree) {
proto_tree_add_item(asap_tree, hf_message_type, message_tvb, MESSAGE_TYPE_OFFSET, MESSAGE_TYPE_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(asap_tree, hf_message_flags, message_tvb, MESSAGE_FLAGS_OFFSET, MESSAGE_FLAGS_LENGTH, NETWORK_BYTE_ORDER);
proto_tree_add_item(asap_tree, hf_message_length, message_tvb, MESSAGE_LENGTH_OFFSET, MESSAGE_LENGTH_LENGTH, NETWORK_BYTE_ORDER);
parameters_tvb = tvb_new_subset(message_tvb, MESSAGE_VALUE_OFFSET, -1, -1);
dissect_parameters(parameters_tvb, asap_tree);
}
}
static void
dissect_asap(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *asap_item;
proto_tree *asap_tree;
/* make entry in the Protocol column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ASAP");
/* 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 asap protocol tree */
asap_item = proto_tree_add_item(tree, proto_asap, message_tvb, 0, -1, FALSE);
asap_tree = proto_item_add_subtree(asap_item, ett_asap);
} else {
asap_tree = NULL;
};
/* dissect the message */
dissect_asap_message(message_tvb, pinfo, asap_tree);
}
/* Register the protocol with Ethereal */
void
proto_register_asap(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_message_type, { "Type", "asap.message_type", FT_UINT8, BASE_DEC, VALS(message_type_values), 0x0, "", HFILL } },
{ &hf_message_flags, { "Flags", "asap.message_flags", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL } },
{ &hf_message_length, { "Length", "asap.message_length", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_cause_code, { "Cause code", "asap.cause.code", FT_UINT16, BASE_HEX, VALS(cause_code_values), 0x0, "", HFILL } },
{ &hf_cause_length, { "Cause length", "asap.cause.length", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_cause_info, { "Cause info", "asap.cause.info", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL } },
{ &hf_cause_padding, { "Padding", "asap.cause.padding", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL } },
{ &hf_parameter_type, { "Parameter Type", "asap.parameter.type", FT_UINT16, BASE_HEX, VALS(parameter_type_values), 0x0, "", HFILL } },
{ &hf_parameter_length, { "Parameter length", "asap.parameter.length", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_parameter_value, { "Parameter value", "asap.parameter.value", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL } },
{ &hf_parameter_padding, { "Padding", "asap.parameter.padding", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL } },
{ &hf_parameter_ipv4_address, { "IP Version 4 address", "asap.ipv4_address.ipv4_address", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL } },
{ &hf_parameter_ipv6_address, { "IP Version 6 address", "asap.ipv6_address.ipv6_address", FT_IPv6, BASE_NONE, NULL, 0x0, "", HFILL } },
{ &hf_sctp_port, { "Port", "asap.sctp_transport.port", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_sctp_reserved, { "Reserved", "asap.sctp_transport.reserved", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_tcp_port, { "Port", "asap.tcp_transport.port", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_tcp_reserved, { "Reserved", "asap.tcp_transport.reserved", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_udp_port, { "Port", "asap.udp_transport.port", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_udp_reserved, { "Reserved", "asap.udp_transport.reserved", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_policy_type, { "Policy type", "asap.pool_member_slection_policy.type", FT_UINT8, BASE_DEC, VALS(policy_type_values), 0x0, "", HFILL } },
{ &hf_policy_value, { "Policy value", "asap.pool_member_slection_policy.value", FT_INT24, BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_pool_handle, { "Pool handle", "asap.pool_handle.pool_handle", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL } },
{ &hf_pe_pe_identifier, { "PE identifier", "asap.pool_element.pe_identifier", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } },
{ &hf_home_enrp_id, { "Home ENRP server identifier", "asap.pool_element.home_enrp_server_identifier", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } },
{ &hf_reg_life, { "Registration life", "asap.pool_element.registration_life", FT_INT32, BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_server_identifier, { "Server identifier", "asap.server_information.server_identifier", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } },
{ &hf_m_bit, { "M-Bit", "asap.server_information.m_bit", FT_BOOLEAN, 32, NULL, M_BIT_MASK, "", HFILL } },
{ &hf_reserved, { "Reserved", "asap.server_information.reserved", FT_UINT32, BASE_HEX, NULL, RESERVED_MASK, "", HFILL } },
{ &hf_cookie, { "Cookie", "asap.cookie.cookie", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL } },
{ &hf_pe_identifier, { "PE identifier", "asap.pe_identifier.pe_identifier", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } },
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_asap,
&ett_asap_parameter,
&ett_asap_cause,
};
/* Register the protocol name and description */
proto_asap = proto_register_protocol("Aggregate Server Access Protocol", "ASAP", "asap");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_asap, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_asap(void)
{
dissector_handle_t asap_handle;
asap_handle = create_dissector_handle(dissect_asap, proto_asap);
dissector_add("sctp.ppi", ASAP_PAYLOAD_PROTOCOL_ID, asap_handle);
}
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