plugins-wimax-msg_dreg.c

Intel的WIMAX代码,主要是mac层code

		&hf_dreg_retain_ms_service_tod,
		{
			"Retain MS service and operational information associated with Time of Day", "wimax.dreg.retain_ms_service_tod",
			FT_UINT8, BASE_DEC, NULL, 0x10, "", HFILL
		}
	},
	{
		&hf_dreg_cmd_message_type,
		{
			"MAC Management Message Type", "wimax.macmgtmsgtype.dreg_cmd",
			FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL
		}
	},
	{
		&hf_dreg_cmd_action,
		{
			"DREG-CMD Action code", "wimax.dreg_cmd.action",
			FT_UINT8, BASE_DEC, VALS(vals_dreg_cmd_action), 0x07, "", HFILL
		}
	},
	{
		&hf_dreg_cmd_action_cor2,
		{
			"DREG-CMD Action code", "wimax.dreg_cmd.action",
			FT_UINT8, BASE_DEC, VALS(vals_dreg_cmd_action_cor2), 0x07, "", HFILL
		}
	},
	{
		&hf_dreg_cmd_reserved,
		{
			"Reserved", "wimax.dreg_cmd.action_reserved",
			FT_UINT8, BASE_DEC, NULL, 0xF8, "", HFILL
		}
	},
	{
		&hf_dreg_req_message_type,
		{
			"MAC Management Message Type", "wimax.macmgtmsgtype.dreg_req",
			FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL
		}
	},
	{
		&hf_dreg_req_action,
		{
			"DREG-REQ Action code", "wimax.dreg_req.action",
			FT_UINT8, BASE_DEC, VALS(vals_dreg_req_code), 0x03, "", HFILL
		}
	},
	{
		&hf_dreg_req_reserved,
		{
			"Reserved", "wimax.dreg_req.action_reserved",
			FT_UINT8, BASE_DEC, NULL, 0xFC, "", HFILL
		}
	},
	{
		&hf_tlv_value,
		{
			"Value", "wimax.dreg.unknown_tlv_value",
			FT_BYTES, BASE_NONE, NULL, 0x00, "", HFILL
		}
	},
	{
		&hf_ack_type_reserved,
		{
			"Reserved", "wimax.ack_type_reserved",
			FT_UINT8, BASE_DEC, NULL, 0x03, "", HFILL
		}
	}
};


/* Decode sub-TLV's of either DREG-REQ or DREG-CMD. */
static void dissect_dreg_tlv(proto_tree *dreg_tree, gint tlv_type, tvbuff_t *tvb, guint tlv_offset, guint tlv_len)
{
	guint tvb_len;
	/*guint tlv_len;*/

	/* Get the tvb reported length */
	tvb_len =  tvb_reported_length(tvb);

	switch (tlv_type) {
		case DREG_PAGING_INFO:
			proto_tree_add_item(dreg_tree, hf_dreg_paging_cycle, tvb, tlv_offset, 2, FALSE);
			proto_tree_add_item(dreg_tree, hf_dreg_paging_offset, tvb, tlv_offset + 2, 1, FALSE);
			proto_tree_add_item(dreg_tree, hf_dreg_paging_group_id, tvb, tlv_offset + 3, 2, FALSE);
			break;
		case DREG_REQ_DURATION:
			proto_tree_add_item(dreg_tree, hf_dreg_req_duration, tvb, tlv_offset, 1, FALSE);
			break;
		case DREG_PAGING_CONTROLLER_ID:
			proto_tree_add_item(dreg_tree, hf_paging_controller_id, tvb, tlv_offset, 6, FALSE);
			break;
		case DREG_IDLE_MODE_RETAIN_INFO:
			proto_tree_add_item(dreg_tree, hf_dreg_retain_ms_service_sbc, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(dreg_tree, hf_dreg_retain_ms_service_pkm, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(dreg_tree, hf_dreg_retain_ms_service_reg, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(dreg_tree, hf_dreg_retain_ms_service_network_address, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(dreg_tree, hf_dreg_retain_ms_service_tod, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(dreg_tree, hf_dreg_retain_ms_service_tftp, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(dreg_tree, hf_dreg_retain_ms_service_full_service, tvb, tlv_offset, 1, FALSE);
			proto_tree_add_item(dreg_tree, hf_dreg_consider_paging_pref, tvb, tlv_offset, 1, FALSE);
			break;
		case DREG_MAC_HASH_SKIP_THRESHOLD:
			proto_tree_add_item(dreg_tree, hf_mac_hash_skip_threshold, tvb, tlv_offset, 2, FALSE);
			break;
		case DREG_PAGING_CYCLE_REQUEST:
			proto_tree_add_item(dreg_tree, hf_dreg_paging_cycle_request, tvb, tlv_offset, 2, FALSE);
			break;
		default:
			proto_tree_add_item(dreg_tree, hf_tlv_value, tvb, tlv_offset, tlv_len, FALSE);
			break;
	}
}

/* Register Wimax Mac Payload Protocol and Dissector */
void proto_register_mac_mgmt_msg_dreg_req(void)
{
	if (proto_mac_mgmt_msg_dreg_req_decoder == -1) {
		proto_mac_mgmt_msg_dreg_req_decoder = proto_register_protocol (
							"WiMax DREG-REQ/CMD Messages", /* name */
							"WiMax DREG-REQ/CMD (dreg)", /* short name */
							"dreg" /* abbrev */
							);

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

/* Register Wimax Mac Payload Protocol and Dissector */
void proto_register_mac_mgmt_msg_dreg_cmd(void)
{
	if (proto_mac_mgmt_msg_dreg_cmd_decoder == -1) {
		proto_mac_mgmt_msg_dreg_cmd_decoder = proto_mac_mgmt_msg_dreg_req_decoder;

		proto_register_subtree_array(ett, array_length(ett));
	}
}

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

	/* Ensure the right payload type */
	payload_type = tvb_get_guint8(tvb, 0);
	if(payload_type != MAC_MGMT_MSG_DREG_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 DREG-REQ */
		dreg_req_item = proto_tree_add_protocol_format(tree, proto_mac_mgmt_msg_dreg_req_decoder, tvb, 0, tvb_len, "MAC Management Message, DREG-REQ (49)");
		/* add MAC DREG REQ subtree */
		dreg_req_tree = proto_item_add_subtree(dreg_req_item, ett_mac_mgmt_msg_dreg_decoder);
		/* display the Message Type */
		proto_tree_add_item(dreg_req_tree, hf_dreg_req_message_type, tvb, offset, 1, FALSE);
		offset++;
		/* display the Action Code */
		proto_tree_add_item(dreg_req_tree, hf_dreg_req_action, tvb, offset, 1, FALSE);
		/* show the Reserved bits */
		proto_tree_add_item(dreg_req_tree, hf_dreg_req_reserved, tvb, offset, 1, FALSE);
		offset++;

		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, "DREG-REQ TLV error");
				}
				proto_tree_add_item(dreg_req_tree, hf_dreg_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 HMAC_TUPLE:	/* Table 348d */
					/* decode and display the HMAC Tuple */
					tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_dreg_decoder, dreg_req_tree, proto_mac_mgmt_msg_dreg_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_dreg_decoder, dreg_req_tree, proto_mac_mgmt_msg_dreg_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:
					/* Decode DREG-REQ sub-TLV's */
					tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_dreg_decoder, dreg_req_tree, proto_mac_mgmt_msg_dreg_req_decoder, tvb, tlv_offset, tlv_len, "DREG-REQ sub-TLV's (%u byte(s))", tlv_len);
					dissect_dreg_tlv(tlv_tree, tlv_type, tvb, tlv_offset, tlv_len);
					break;
			}


			offset = tlv_len + tlv_offset;
		}	/* end of TLV process while loop */
		if (!hmac_found)
			proto_item_append_text(dreg_req_tree, " (HMAC Tuple is missing !)");
	}
}

/* Decode DREG-CMD messages. */
void dissect_mac_mgmt_msg_dreg_cmd_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
	guint offset = 0;
	guint tlv_offset;
	guint tvb_len, payload_type;
	proto_item *dreg_cmd_item = NULL;
	proto_tree *dreg_cmd_tree = NULL;
	proto_tree *tlv_tree = NULL;
	tlv_info_t tlv_info;
	gint tlv_type;
	gint tlv_len;
	gboolean hmac_found = FALSE;

	/* Ensure the right payload type */
	payload_type = tvb_get_guint8(tvb, 0);
	if(payload_type != MAC_MGMT_MSG_DREG_CMD)
	{
		return;
	}

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

		/* Get the tvb reported length */
		tvb_len =  tvb_reported_length(tvb);
		/* display MAC payload type DREG-CMD */
		dreg_cmd_item = proto_tree_add_protocol_format(tree, proto_mac_mgmt_msg_dreg_cmd_decoder, tvb, 0, tvb_len, "MAC Management Message, DREG-CMD (29)");
		/* add MAC DREG CMD subtree */
		dreg_cmd_tree = proto_item_add_subtree(dreg_cmd_item, ett_mac_mgmt_msg_dreg_decoder);
		/* display the Message Type */
		proto_tree_add_item(dreg_cmd_tree, hf_dreg_cmd_message_type, tvb, offset, 1, FALSE);
		offset ++;
		/* display the Action Code */
		if (include_cor2_changes)
			proto_tree_add_item(dreg_cmd_tree, hf_dreg_cmd_action_cor2, tvb, offset, 1, FALSE);
		else
			proto_tree_add_item(dreg_cmd_tree, hf_dreg_cmd_action, tvb, offset, 1, FALSE);
		/* show the Reserved bits */
		proto_tree_add_item(dreg_cmd_tree, hf_dreg_cmd_reserved, tvb, offset, 1, FALSE);
		offset ++;

		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, "DREG-CMD TLV error");
				}
				proto_tree_add_item(dreg_cmd_tree, hf_dreg_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 HMAC_TUPLE:	/* Table 348d */
					/* decode and display the HMAC Tuple */
					tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_dreg_decoder, dreg_cmd_tree, proto_mac_mgmt_msg_dreg_cmd_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_dreg_decoder, dreg_cmd_tree, proto_mac_mgmt_msg_dreg_cmd_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:
					/* Decode DREG-CMD sub-TLV's */
					tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_dreg_decoder, dreg_cmd_tree, proto_mac_mgmt_msg_dreg_cmd_decoder, tvb, tlv_offset, tlv_len, "DREG-CMD sub-TLV's (%u byte(s))", tlv_len);
					dissect_dreg_tlv(tlv_tree, tlv_type, tvb, tlv_offset, tlv_len);
					break;
			}

			offset = tlv_len + tlv_offset;
		}	/* end of TLV process while loop */
		if (!hmac_found)
			proto_item_append_text(dreg_cmd_tree, " (HMAC Tuple is missing !)");
	}
}




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