jigb_wlan_support.ex.c

利用opnet网络仿真软件,研究802.11的QOS,可以利用此模块研究802.11e

wlan_mac_pk_dhstruct_destroy (WlanT_Data_Header_Fields* pk_dhstruct_ptr)
    {
    /**  Deallocate the packet structure memory.     **/
    FIN (wlan_mac_pk_dhstruct_destroy (pk_dhstruct_ptr));
     
	/* Destroy frame control field structure         */
    op_prg_mem_free (pk_dhstruct_ptr);
    
    FOUT;
    } 
 

void 
wlan_mac_pk_chstruct_destroy (WlanT_Control_Header_Fields* pk_chstruct_ptr) 
    { 
    /*  Deallocate the packet structure memory.     */ 
    FIN (wlan_mac_pk_chstruct_destroy (pk_chstruct_ptr)); 
	 
	/* Destroy frame control field structure         */     
    op_prg_mem_free (pk_chstruct_ptr); 
     
    FOUT; 
    } 

void 
wlan_mac_pk_rhstruct_destroy (WlanT_Req_Header_Fields* pk_rhstruct_ptr) 
    { 
    /*  Deallocate the packet structure memory.     */ 
    FIN (wlan_mac_pk_rhstruct_destroy (pk_rhstruct_ptr)); 
	 
	/* Destroy frame control field structure         */     
    op_prg_mem_free (pk_rhstruct_ptr); 
     
    FOUT; 
    } 



void
wlan_mac_pk_bbstruct_destroy (WlanT_Beacon_Body_Fields* pk_bbstruct_ptr)
    {
    /**  Deallocate the packet structure memory.     **/
    FIN (wlan_mac_pk_bbstruct_destroy (pk_bbstruct_ptr));
     
	/* Destroy frame control field structure         */
    op_prg_mem_free (pk_bbstruct_ptr);
    
    FOUT;
    } 


void
wlan_mac_pk_data_header_pkprint (void* structure_ptr, PrgT_List* output_list)
	{
	char		temp_str[128];
	char*		alloc_str;
	WlanT_Data_Header_Fields* pk_dh_ptr;
	/** Called as part of a packet print, this procedure will	**/
	/** place the contents of the "fields" structure into a		**/
	/** printed list.											**/
	FIN (wlan_mac_pk_data_header_pkprint (structure_ptr, output_list));

    pk_dh_ptr = (WlanT_Data_Header_Fields *) structure_ptr;

	sprintf(temp_str, "      more_frag           int         %-16d(1)", pk_dh_ptr->more_frag);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      retry               int         %-16d(1)", pk_dh_ptr->retry);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      order               int         %-16d(1)", pk_dh_ptr->order);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      tods               int         %-16d(1)", pk_dh_ptr->tods);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      fromds               int         %-16d(1)", pk_dh_ptr->fromds);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      duration            double         %-16.6f(16)", pk_dh_ptr->duration);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      address1            int         %-16d(48)", pk_dh_ptr->address1);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      address2            int       %-16d(48)", pk_dh_ptr->address2);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      address3            int       %-16d(48)", pk_dh_ptr->address3);	
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      fragment_number     int       %-16d(32)", pk_dh_ptr->fragment_number);	
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      sequence_number     int       %-16d(96)", pk_dh_ptr->sequence_number);	
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      address4 (omitted)  int       %-16d(0)", pk_dh_ptr->address4);	
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)		
		
	sprintf(temp_str, "      more_data           int         %-16d(1)", pk_dh_ptr->more_data);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)
		
	FOUT;
	}

void
wlan_mac_pk_control_header_pkprint (void* structure_ptr, PrgT_List* output_list)
	{
	char		temp_str[128];
	char*		alloc_str;
	WlanT_Control_Header_Fields* pk_ch_ptr;
	/** Called as part of a packet print, this procedure will	**/
	/** place the contents of the "fields" structure into a		**/
	/** printed list.											**/
	FIN (wlan_mac_pk_control_header_pkprint (structure_ptr, output_list));

	pk_ch_ptr = (WlanT_Control_Header_Fields* ) structure_ptr;

	sprintf(temp_str, "      more_frag           int         %-16d(1)", pk_ch_ptr->more_frag);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      retry               int         %-16d(1)", pk_ch_ptr->retry);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      order               int         %-16d(1)", pk_ch_ptr->order);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      duration            double         %-16.6f(16)", pk_ch_ptr->duration);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "     rx_addr              int         %-16d(48)", pk_ch_ptr->rx_addr);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      tx_addr             int       %-16d(48)", pk_ch_ptr->tx_addr);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)
		
	FOUT;
	}

void
wlan_mac_pk_req_header_pkprint (void* structure_ptr, PrgT_List* output_list)
	{
	char		temp_str[128];
	char*		alloc_str;
	WlanT_Req_Header_Fields* pk_rh_ptr;
	/** Called as part of a packet print, this procedure will	**/
	/** place the contents of the "fields" structure into a		**/
	/** printed list.											**/
	FIN (wlan_mac_pk_req_header_pkprint (structure_ptr, output_list));

	pk_rh_ptr = (WlanT_Req_Header_Fields* ) structure_ptr;

	sprintf(temp_str, "      more_frag           int         %-16d(1)", pk_rh_ptr->more_frag);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      retry               int         %-16d(1)", pk_rh_ptr->retry);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      order               int         %-16d(1)", pk_rh_ptr->order);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      duration            double         %-16.6f(16)", pk_rh_ptr->duration);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "     rx_addr              int         %-16d(48)", pk_rh_ptr->rx_addr);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      tx_addr             int       %-16d(48)", pk_rh_ptr->tx_addr);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)
		
	sprintf(temp_str, "      P                   int       %-16d(3)", pk_rh_ptr->P);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)	
		
	sprintf(temp_str, "      Lm                   int       %-16d(16)", pk_rh_ptr->Lm);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)		
		
	sprintf(temp_str, "      lm                   int       %-16d(16)", pk_rh_ptr->lm);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)		
	
	sprintf(temp_str, "      Nm                   int       %-16d(16)", pk_rh_ptr->Nm);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)			
		
	sprintf(temp_str, "      flagm                int       %-16d(2)", pk_rh_ptr->flagm);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)		
		
		
	FOUT;
	}

void
wlan_mac_pk_beacon_body_pkprint (void* structure_ptr, Prg_List* output_list)
	{
	char		temp_str[128];
	char*		alloc_str;
	WlanT_Beacon_Body_Fields* pk_bb_ptr;
	/** Called as part of a packet print, this procedure will	**/
	/** place the contents of the "fields" structure into a		**/
	/** printed list.											**/
	FIN (wlan_mac_pk_beacon_body_pkprint (structure_ptr, output_list));

	pk_bb_ptr = (WlanT_Beacon_Body_Fields* ) structure_ptr;

	sprintf(temp_str, "      timestamp               double      %-16.6f(16)", pk_bb_ptr->timestamp);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      beacon interval         double      %-16.6f(16)", pk_bb_ptr->beacon_intv);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      CFP count               int         %-16d(1)", pk_bb_ptr->cf_par.cfp_count);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      CFP period              int         %-16d(1)", pk_bb_ptr->cf_par.cfp_period);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      CFP Max Duration        double      %-16.6f(16)", pk_bb_ptr->cf_par.cfp_maxduration);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)

	sprintf(temp_str, "      CFP Duration Remaining  double      %-16.6f(16)", pk_bb_ptr->cf_par.cfp_durremaining);
	PKPRINT_STRING_INSERT (alloc_str, temp_str, output_list)
		
	FOUT;
	}

void
wlan_ap_reliability_eval (Packet *beacon_pkptr, int accepted, WlanT_Roam_State_Info *roam_state_ptr)
	{
	WlanT_Data_Header_Fields*	pk_dhstruct_ptr;
	Objid						tx_ch_objid;

	/** Evaluate the reliability of the AP from which a Beacon has been received 	**/
	/** The evaluation criteria depends on whether the STA is currently connected	**/
	/** to the AP or not.															**/
	FIN (wlan_ap_reliability_eval (Packet *beacon_pkptr, int accepted, WlanT_Roam_State_Info *roam_state_ptr));

	/* Skip if distance based scan is used. 										*/
	if (roam_state_ptr->scan_type == WlanC_Scan_Type_Distance)
		{
		FOUT;
		}
	
	/* If the STA is connected to an AP (it is not in scan mode), then the criteria	*/
	/* for evaluating the whether the connection still exists is the weighted prob.	*/
	/* of Beacon reception. 														*/
	if (roam_state_ptr->scan_mode == OPC_FALSE)
		{
		/* See if this is a Beacon coming from the current AP. In the Beacon		*/
		/* frames, the "address3" field of the frame header contains the BSS ID of	*/
		/* the sending Access Point.												*/
		op_pk_nfd_access (beacon_pkptr, "Wlan Header",	&pk_dhstruct_ptr);
		if (roam_state_ptr->current_bss_id != pk_dhstruct_ptr->address3)
			{
			FOUT;		
			}
		
		/* Update the reliability figure based on the status of the Beacon.			*/
		if (accepted)
			{
			roam_state_ptr->ap_reliability = WLANC_AP_RELIABILITY_COEFF * roam_state_ptr->ap_reliability + (1 - WLANC_AP_RELIABILITY_COEFF);
			}
		else
			{
			roam_state_ptr->ap_reliability = WLANC_AP_RELIABILITY_COEFF * roam_state_ptr->ap_reliability;
			}

		/* If the reliability drops below a threshold, the STA will start scanning	*/
		/* for a new AP. 															*/
		if (roam_state_ptr->ap_reliability < WLANC_AP_SCAN_START_THRESHOLD)
			{
			roam_state_ptr->scan_mode = OPC_TRUE;
			}
		}
	else
		{
		/* If the STA is in scan mode, then it is not connected to any AP. In this	*/
		/* case, the criteria for an AP to be acceptable is that all Beacons in the	*/
		/* scan period are received without error. 									*/
		if (roam_state_ptr->ap_reliability == WLANC_AP_RELIABILITY_UNKNOWN)
			{
			if (accepted)
				{
				/* This is first accepted Beacon in this scan period. Record the	*/
				/* ch_id for next Beacon. 											*/
				roam_state_ptr->ap_reliability = WLANC_AP_UNRELIABLE;
				roam_state_ptr->last_accepted_ap_ch_objid = op_td_get_int (beacon_pkptr, OPC_TDA_RA_TX_CH_OBJID);
				}
			}
		else
			{
			/* Second time around. 													*/
			if (accepted)
				{
				tx_ch_objid = op_td_get_int (beacon_pkptr, OPC_TDA_RA_TX_CH_OBJID);
				if (tx_ch_objid == roam_state_ptr->last_accepted_ap_ch_objid)
					{
					/* Second packet is also good. 									*/
					roam_state_ptr->ap_reliability = WLANC_AP_RELIABLE;
					}
				}
			}
		}

	FOUT;
	}