/* 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 * * $Id: packet-asap.c,v 1.11 2003/12/21 05:51:32 jmayer Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * Copied from README.developer * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include "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); }