plugins-wimax-msg_reg_req.c

Intel的WIMAX代码,主要是mac层code

			}
			break;
		case REG_MCA_FLOW_CONTROL:
			tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_mca_flow_control, tvb, tlv_offset, tlv_len, FALSE);
			tlv_item = proto_tree_add_item(tlv_tree, hf_reg_mca_flow_control, tvb, tlv_offset, 1, FALSE);
			if (tvb_get_guint8(tvb, tlv_offset) == 0) {
				proto_item_append_text(tlv_item, " (no limit)");
			}
			break;
		case REG_MCAST_POLLING_CIDS:
			tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_mcast_polling_cids, tvb, tlv_offset, tlv_len, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_mcast_polling_cids, tvb, tlv_offset, 1, FALSE);
			break;
		case REG_NUM_DL_TRANS_CID:
			tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_num_dl_trans_cid, tvb, tlv_offset, tlv_len, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_num_dl_trans_cid, tvb, tlv_offset, 2, FALSE);
			break;
		case REG_MAC_ADDRESS:
			tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_mac_address, tvb, tlv_offset, tlv_len, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_mac_address, tvb, tlv_offset, 6, FALSE);
			break;
		case REG_TLV_T_20_MAX_MAC_DATA_PER_FRAME_SUPPORT:
			/* display Maximum MAC level data per frame info */
			/* add subtree */
			tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_registry, tvb, tlv_offset, tlv_len, "Maximum MAC level data per frame (%u byte(s))", tlv_len);
			/* decode and display Maximum MAC level data per frame for UL & DL */
			/* Set endpoint of the subTLVs (tlv_offset + length) */
			tlv_end = tlv_offset + tlv_len;
			/* process subTLVs */
			while ( tlv_offset < tlv_end )
			{	/* get the TLV information */
				init_tlv_info(&tlv_info, tvb, tlv_offset);
				/* get the TLV type */
				tlv_type = get_tlv_type(&tlv_info);
				/* get the TLV length */
				length = get_tlv_length(&tlv_info);
				if(tlv_type == -1 || length > MAX_TLV_LEN || length < 1)
				{	/* invalid tlv info */
					if (pinfo->cinfo)
					{
						col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "REG-REQ TLV error");
					}
					proto_tree_add_item(reg_req_tree, hf_reg_invalid_tlv, tvb, offset, (tvb_len - offset), FALSE);
					break;
				}
				/* update the offset */
				tlv_offset += get_tlv_value_offset(&tlv_info);
				nblocks = tvb_get_ntohs(tvb, tlv_offset);
				switch (tlv_type)
				{
					case REG_TLV_T_20_1_MAX_MAC_LEVEL_DATA_PER_DL_FRAME:
						sub_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, tlv_tree, hf_reg_tlv_t_20_1_max_mac_level_data_per_dl_frame, tvb, tlv_offset, length, FALSE);
						tlv_item = proto_tree_add_item(sub_tree, hf_reg_tlv_t_20_1_max_mac_level_data_per_dl_frame, tvb, tlv_offset, 2, FALSE);
						if ( nblocks == 0 )
						{
							proto_item_append_text(tlv_item, " (Unlimited bytes)");
						} else {
							proto_item_append_text(tlv_item, " (%d bytes)", 256 * nblocks);
						}
						break;
					case REG_TLV_T_20_2_MAX_MAC_LEVEL_DATA_PER_UL_FRAME:
						sub_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, tlv_tree, hf_reg_tlv_t_20_2_max_mac_level_data_per_ul_frame, tvb, tlv_offset, length, FALSE);
						tlv_item = proto_tree_add_item(sub_tree, hf_reg_tlv_t_20_2_max_mac_level_data_per_ul_frame, tvb, tlv_offset, 2, FALSE);
						if ( nblocks == 0 )
						{
							proto_item_append_text(tlv_item, " (Unlimited bytes)");
						} else {
							proto_item_append_text(tlv_item, " (%d bytes)", 256 * nblocks);
						}
						break;
					default:
						sub_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, tlv_tree, hf_reg_invalid_tlv, tvb, tlv_offset, (tlv_end - tlv_offset), FALSE);
						proto_tree_add_item(sub_tree, hf_reg_invalid_tlv, tvb, tlv_offset, (tlv_end - tlv_offset), FALSE);
						break;
				}
				tlv_offset += length;
			}
			break;

		case REG_TLV_T_21_PACKING_SUPPORT:
			tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_tlv_t_21_packing_support, tvb, tlv_offset, tlv_len, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_21_packing_support, tvb, tlv_offset, 1, FALSE);
			break;
		case REG_TLV_T_22_MAC_EXTENDED_RTPS_SUPPORT:
			tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_tlv_t_22_mac_extended_rtps_support, tvb, tlv_offset, tlv_len, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_22_mac_extended_rtps_support, tvb, tlv_offset, 1, FALSE);
			break;
		case REG_TLV_T_23_MAX_NUM_BURSTS_TRANSMITTED_CONCURRENTLY_TO_THE_MS:
			tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_tlv_t_23_max_num_bursts_concurrently_to_the_ms, tvb, tlv_offset, tlv_len, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_23_max_num_bursts_concurrently_to_the_ms, tvb, tlv_offset, 1, FALSE);
			break;
		case REG_TLV_T_26_METHOD_FOR_ALLOCATING_IP_ADDR_SECONDARY_MGMNT_CONNECTION:
			/* add TLV subtree */
			tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_registry, tvb, tlv_offset, tlv_len, "Method for allocating IP address for the secondary management connection (%d)", tvb_get_guint8(tvb, tlv_offset));
			proto_tree_add_item(tlv_tree, hf_reg_method_for_allocating_ip_addr_sec_mgmt_conn_dhcp, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_method_for_allocating_ip_addr_sec_mgmt_conn_mobile_ipv4, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_method_for_allocating_ip_addr_sec_mgmt_conn_dhcpv6, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_method_for_allocating_ip_addr_sec_mgmt_conn_ipv6, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_method_for_allocating_ip_addr_sec_mgmt_conn_rsvd, tvb, tlv_offset, 1, FALSE);
			break;
		case REG_TLV_T_27_HANDOVER_SUPPORTED:
			/* add TLV subtree */
			tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_registry, tvb, tlv_offset, tlv_len, "Handover Support (%d)", tvb_get_guint8(tvb, tlv_offset));
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_27_handover_fbss_mdho_ho_disable, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_27_handover_fbss_mdho_dl_rf_monitoring_maps, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_27_handover_mdho_dl_monitoring_single_map, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_27_handover_mdho_dl_monitoring_maps, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_27_handover_mdho_ul_multiple, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_27_handover_reserved, tvb, tlv_offset, 1, FALSE);
			break;
		case REG_TLV_T_29_HO_PROCESS_OPTIMIZATION_MS_TIMER:
			tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_tlv_t_29_ho_process_opt_ms_timer, tvb, tlv_offset, tlv_len, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_29_ho_process_opt_ms_timer, tvb, tlv_offset, 1, FALSE);
			break;
		case REG_TLV_T_31_MOBILITY_FEATURES_SUPPORTED:
			/* add TLV subtree */
			tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_registry, tvb, tlv_offset, tlv_len, "Mobility Features Supported (%d)", tvb_get_guint8(tvb, tlv_offset));
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_31_mobility_handover, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_31_mobility_sleep_mode, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_31_mobility_idle_mode, tvb, tlv_offset, 1, FALSE);
			break;
		case REG_TLV_T_40_ARQ_ACK_TYPE:
			/* add TLV subtree */
			tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_registry, tvb, tlv_offset, tlv_len, "ARQ ACK Type 0x%02x", tvb_get_guint8(tvb, tlv_offset));
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_40_arq_ack_type_selective_ack_entry, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_40_arq_ack_type_cumulative_ack_entry, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_40_arq_ack_type_cumulative_with_selective_ack_entry, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_40_arq_ack_type_cumulative_ack_with_block_sequence_ack, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_40_arq_ack_type_reserved, tvb, tlv_offset, 1, FALSE);
			break;
		case REG_TLV_T_41_MS_HO_CONNECTIONS_PARAM_PROCESSING_TIME:
			tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_tlv_t_41_ho_connections_param_processing_time, tvb, tlv_offset, tlv_len, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_41_ho_connections_param_processing_time, tvb, tlv_offset, 1, FALSE);
			break;
		case REG_TLV_T_42_MS_HO_TEK_PROCESSING_TIME:
			tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_tlv_t_42_ho_tek_processing_time, tvb, tlv_offset, tlv_len, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_42_ho_tek_processing_time, tvb, tlv_offset, 1, FALSE);
			break;
		case REG_TLV_T_43_MAC_HEADER_AND_EXTENDED_SUBHEADER_SUPPORT:
			/* add TLV subtree */
			tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_registry, tvb, tlv_offset, tlv_len, "MAC header and extended subheader support %d", tvb_get_ntoh24(tvb, tlv_offset));
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_bandwidth_request_ul_tx_power_report_header_support, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_bandwidth_request_cinr_report_header_support, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_cqich_allocation_request_header_support, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_phy_channel_report_header_support, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_bandwidth_request_ul_sleep_control_header_support, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_sn_report_header_support, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_feedback_header_support, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_sdu_sn_extended_subheader_support_and_parameter, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_sdu_sn_parameter, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_dl_sleep_control_extended_subheader, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_feedback_request_extended_subheader, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_mimo_mode_feedback_extended_subheader, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_ul_tx_power_report_extended_subheader, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_mini_feedback_extended_subheader, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_sn_request_extended_subheader, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_pdu_sn_short_extended_subheader, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_pdu_sn_long_extended_subheader, tvb, tlv_offset, 3, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_tlv_t_43_reserved, tvb, tlv_offset, 3, FALSE);
			break;
		case REG_REQ_BS_SWITCHING_TIMER:
			/* add TLV subtree */
			tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_registry, tvb, tlv_offset, tlv_len, "BS switching timer (%d)", tvb_get_guint8(tvb, tlv_offset));
			proto_tree_add_item(tlv_tree, hf_reg_req_min_time_for_intra_fa, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(tlv_tree, hf_reg_req_min_time_for_inter_fa, tvb, tlv_offset, 1, FALSE);
			break;
		case VENDOR_SPECIFIC_INFO:
		case VENDOR_ID_ENCODING:
		case CURRENT_TX_POWER:
		case MAC_VERSION_ENCODING:
		case CMAC_TUPLE:	/* Table 348b */
			wimax_common_tlv_encoding_decoder(tvb_new_subset(tvb, offset, (tvb_len - offset), (tvb_len - offset)), pinfo, reg_req_tree);
			break;
		default:
			tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_registry, tvb, tlv_offset, (tvb_len - tlv_offset), FALSE);
			proto_tree_add_item(tlv_tree, hf_tlv_type, tvb, tlv_offset, (tvb_len - tlv_offset), FALSE);
			break;
	}
#endif
}

/* Register Wimax Mac Payload Protocol and Dissector */
void proto_register_mac_mgmt_msg_reg_req(void)
{
	if (proto_mac_mgmt_msg_reg_req_decoder == -1)
	{
		proto_mac_mgmt_msg_reg_req_decoder = proto_register_protocol (
							"WiMax REG-REQ/RSP Messages", /* name */
							"WiMax REG-REQ/RSP (reg)", /* short name */
							"reg" /* abbrev */
							);

		proto_register_field_array(proto_mac_mgmt_msg_reg_req_decoder, hf, array_length(hf));
		proto_register_subtree_array(ett, array_length(ett));
	}
}

/* Decode REG-REQ messages. */
void dissect_mac_mgmt_msg_reg_req_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
	guint offset = 0;
	guint tlv_offset;
	guint tvb_len, payload_type;
	proto_item *reg_req_item = NULL;
	proto_tree *reg_req_tree = NULL;
	proto_tree *tlv_tree = NULL;
	gboolean hmac_found = FALSE;
	tlv_info_t tlv_info;
	gint tlv_type;
	gint tlv_len;

	/* Ensure the right payload type */
	payload_type = tvb_get_guint8(tvb, offset);
	if (payload_type != MAC_MGMT_MSG_REG_REQ)
	{
		return;
	}

	if (tree)
	{	/* we are being asked for details */

		/* Get the tvb reported length */
		tvb_len =  tvb_reported_length(tvb);
		/* display MAC payload type REG-REQ */
		reg_req_item = proto_tree_add_protocol_format(tree, proto_mac_mgmt_msg_reg_req_decoder, tvb, offset, tvb_len, "MAC Management Message, REG-REQ (6)");
		/* add MAC REG-REQ subtree */
		reg_req_tree = proto_item_add_subtree(reg_req_item, ett_mac_mgmt_msg_reg_req_decoder);
		/* display the Message Type */
		proto_tree_add_item(reg_req_tree, hf_reg_req_message_type, tvb, offset, 1, FALSE);
		offset += 1;

		while(offset < tvb_len)
		{
			/* Get the TLV data. */
			init_tlv_info(&tlv_info, tvb, offset);
			/* get the TLV type */
			tlv_type = get_tlv_type(&tlv_info);
			/* get the TLV length */
			tlv_len = get_tlv_length(&tlv_info);
			if(tlv_type == -1 || tlv_len > MAX_TLV_LEN || tlv_len < 1)
			{	/* invalid tlv info */
				if (pinfo->cinfo)
				{
					col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "REG-REQ TLV error");
				}
				proto_tree_add_item(reg_req_tree, hf_reg_invalid_tlv, tvb, offset, (tvb_len - offset), FALSE);
				break;
			}
			/* get the offset to the TLV data */
			tlv_offset = offset + get_tlv_value_offset(&tlv_info);

			switch (tlv_type) {
				case REG_ARQ_PARAMETERS:
				case REG_SS_MGMT_SUPPORT:
				case REG_IP_MGMT_MODE:
				case REG_IP_VERSION:
				case REG_UL_TRANSPORT_CIDS_SUPPORTED:
				case REG_IP_PHS_SDU_ENCAP:
				case REG_MAX_CLASSIFIERS_SUPPORTED:
				case REG_PHS_SUPPORT:
				case REG_ARQ_SUPPORT:
				case REG_DSX_FLOW_CONTROL:
				case REG_MAC_CRC_SUPPORT:
				case REG_MCA_FLOW_CONTROL:
				case REG_MCAST_POLLING_CIDS:
				case REG_NUM_DL_TRANS_CID:
				case REG_MAC_ADDRESS:
#ifdef WIMAX_16E_2005
				case REG_TLV_T_20_MAX_MAC_DATA_PER_FRAME_SUPPORT:
				case REG_TLV_T_21_PACKING_SUPPORT:
				case REG_TLV_T_22_MAC_EXTENDED_RTPS_SUPPORT:
				case REG_TLV_T_23_MAX_NUM_BURSTS_TRANSMITTED_CONCURRENTLY_TO_THE_MS:
				case REG_TLV_T_26_METHOD_FOR_ALLOCATING_IP_ADDR_SECONDARY_MGMNT_CONNECTION:
				case REG_TLV_T_27_HANDOVER_SUPPORTED:
				case REG_TLV_T_29_HO_PROCESS_OPTIMIZATION_MS_TIMER:
				case REG_TLV_T_31_MOBILITY_FEATURES_SUPPORTED:
				case REG_TLV_T_40_ARQ_ACK_TYPE:
				case REG_TLV_T_41_MS_HO_CONNECTIONS_PARAM_PROCESSING_TIME:
				case REG_TLV_T_42_MS_HO_TEK_PROCESSING_TIME:
				case REG_TLV_T_43_MAC_HEADER_AND_EXTENDED_SUBHEADER_SUPPORT:
				case REG_REQ_BS_SWITCHING_TIMER:
					/* Decode REG-REQ sub-TLV's. */
					dissect_extended_tlv(reg_req_tree, tlv_type, tvb, tlv_offset, tlv_len, pinfo, offset, proto_mac_mgmt_msg_reg_req_decoder);
					break;
#endif
				case REG_REQ_SECONDARY_MGMT_CID:
					tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_req_secondary_mgmt_cid, tvb, tlv_offset, 2, FALSE);
					proto_tree_add_item(tlv_tree, hf_reg_req_secondary_mgmt_cid, tvb, tlv_offset, 2, FALSE);
					break;
				case REG_REQ_TLV_T_32_SLEEP_MODE_RECOVERY_TIME:
					tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_req_tlv_t_32_sleep_mode_recovery_time, tvb, tlv_offset, tlv_len, FALSE);
					proto_tree_add_item(tlv_tree, hf_reg_req_tlv_t_32_sleep_mode_recovery_time, tvb, tlv_offset, 1, FALSE);
					break;
				case REG_REQ_TLV_T_33_MS_PREV_IP_ADDR:
					if ( tlv_len == 4 ) {
						tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_ms_previous_ip_address_v4, tvb, tlv_offset, tlv_len, FALSE);
						proto_tree_add_item(tlv_tree, hf_ms_previous_ip_address_v4, tvb, tlv_offset, tlv_len, FALSE);
					} else if ( tlv_len == 16 ) {
						tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_ms_previous_ip_address_v6, tvb, tlv_offset, tlv_len, FALSE);
						proto_tree_add_item(tlv_tree, hf_ms_previous_ip_address_v6, tvb, tlv_offset, tlv_len, FALSE);
					}
					break;
				case REG_TLV_T_37_IDLE_MODE_TIMEOUT:
					tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_idle_mode_timeout, tvb, tlv_offset, tlv_len, FALSE);
					proto_tree_add_item(tlv_tree, hf_idle_mode_timeout, tvb, tlv_offset, tlv_len, FALSE);
					break;
				case REG_REQ_TLV_T_45_MS_PERIODIC_RANGING_TIMER_INFO:
					tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_req_tlv_t_45_ms_periodic_ranging_timer, tvb, tlv_offset, tlv_len, FALSE);
					proto_tree_add_item(tlv_tree, hf_reg_req_tlv_t_45_ms_periodic_ranging_timer, tvb, tlv_offset, tlv_len, FALSE);
					break;
				case REG_HANDOVER_INDICATION_READINESS_TIMER:
					tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_reg_tlv_t_46_handover_indication_readiness_timer, tvb, tlv_offset, tlv_len, FALSE);
					proto_tree_add_item(tlv_tree, hf_reg_tlv_t_46_handover_indication_readiness_timer, tvb, tlv_offset, tlv_len, FALSE);
					break;

				case DSx_UPLINK_FLOW:
					/* display Uplink Service Flow Encodings info */
					/* add subtree */
					tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_mac_mgmt_msg_reg_req_decoder, tvb, tlv_offset, tlv_len, "Uplink Service Flow Encodings (%u byte(s))", tlv_len);
					/* decode and display the DL Service Flow Encodings */
					wimax_service_flow_encodings_decoder(tvb_new_subset(tvb, tlv_offset, tlv_len, tlv_len), pinfo, tlv_tree);
					break;
				case DSx_DOWNLINK_FLOW:
					/* display Downlink Service Flow Encodings info */
					/* add subtree */
					tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_mac_mgmt_msg_reg_req_decoder, tvb, tlv_offset, tlv_len, "Downlink Service Flow Encodings (%u byte(s))", tlv_len);
					/* decode and display the DL Service Flow Encodings */
					wimax_service_flow_encodings_decoder(tvb_new_subset(tvb, tlv_offset, tlv_len, tlv_len), pinfo, tlv_tree);
					break;
				case HMAC_TUPLE:	/* Table 348d */
					/* decode and display the HMAC Tuple */
					tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_mac_mgmt_msg_reg_req_decoder, tvb, tlv_offset, tlv_len, "HMAC Tuple (%u byte(s))", tlv_len);
					wimax_hmac_tuple_decoder(tlv_tree, tvb, tlv_offset, tlv_len);
					hmac_found = TRUE;
					break;
				case CMAC_TUPLE:	/* Table 348b */
					/* decode and display the CMAC Tuple */
					tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, proto_mac_mgmt_msg_reg_req_decoder, tvb, tlv_offset, tlv_len, "CMAC Tuple (%u byte(s))", tlv_len);
					wimax_cmac_tuple_decoder(tlv_tree, tvb, tlv_offset, tlv_len);
					break;
				default:
					tlv_tree = add_tlv_subtree(&tlv_info, ett_mac_mgmt_msg_reg_req_decoder, reg_req_tree, hf_tlv_type, tvb, tlv_offset, tlv_len, FALSE);
					proto_tree_add_item(tlv_tree, hf_tlv_type, tvb, tlv_offset, tlv_len, FALSE);
					break;
			}
			/* update the offset */
			offset = tlv_len + tlv_offset;
		} /* End while() looping through the tvb. */
		if (!hmac_found)
			proto_item_append_text(reg_req_tree, " (HMAC Tuple is missing !)");
	}
}



      取自 
      http://anonsvn.wireshark.org/wireshark/trunk 的 plugins/wimax/msg_reg_req.c 
      - LGPL - C