sdla_ppp.c

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	/* Only disable the timer interrupt if there are no udp, statistic */
	/* updates or events pending */
        if(!ppp_priv_area->timer_int_enabled) {
                flags->imask &= ~PPP_INTR_TIMER;
        }
}


static int handle_IPXWAN(unsigned char *sendpacket, char *devname, unsigned char enable_IPX, unsigned long network_number, unsigned short proto)
{
	int i;

	if( proto == htons(ETH_P_IPX) ) {
		//It's an IPX packet
		if(!enable_IPX) {
			//Return 1 so we don't pass it up the stack.
			return 1;
		}
	} else {
		//It's not IPX so pass it up the stack.
		return 0;
	}

	if( sendpacket[16] == 0x90 &&
	    sendpacket[17] == 0x04)
	{
		//It's IPXWAN

		if( sendpacket[2] == 0x02 &&
		    sendpacket[34] == 0x00)
		{
			//It's a timer request packet
			printk(KERN_INFO "%s: Received IPXWAN Timer Request packet\n",devname);

			//Go through the routing options and answer no to every
			//option except Unnumbered RIP/SAP
			for(i = 41; sendpacket[i] == 0x00; i += 5)
			{
				//0x02 is the option for Unnumbered RIP/SAP
				if( sendpacket[i + 4] != 0x02)
				{
					sendpacket[i + 1] = 0;
				}
			}

			//Skip over the extended Node ID option
			if( sendpacket[i] == 0x04 )
			{
				i += 8;
			}

			//We also want to turn off all header compression opt.
			for(; sendpacket[i] == 0x80 ;)
			{
				sendpacket[i + 1] = 0;
				i += (sendpacket[i + 2] << 8) + (sendpacket[i + 3]) + 4;
			}

			//Set the packet type to timer response
			sendpacket[34] = 0x01;

			printk(KERN_INFO "%s: Sending IPXWAN Timer Response\n",devname);
		}
		else if( sendpacket[34] == 0x02 )
		{
			//This is an information request packet
			printk(KERN_INFO "%s: Received IPXWAN Information Request packet\n",devname);

			//Set the packet type to information response
			sendpacket[34] = 0x03;

			//Set the router name
			sendpacket[51] = 'P';
			sendpacket[52] = 'T';
			sendpacket[53] = 'P';
			sendpacket[54] = 'I';
			sendpacket[55] = 'P';
			sendpacket[56] = 'E';
			sendpacket[57] = '-';
			sendpacket[58] = CVHexToAscii(network_number >> 28);
			sendpacket[59] = CVHexToAscii((network_number & 0x0F000000)>> 24);
			sendpacket[60] = CVHexToAscii((network_number & 0x00F00000)>> 20);
			sendpacket[61] = CVHexToAscii((network_number & 0x000F0000)>> 16);
			sendpacket[62] = CVHexToAscii((network_number & 0x0000F000)>> 12);
			sendpacket[63] = CVHexToAscii((network_number & 0x00000F00)>> 8);
			sendpacket[64] = CVHexToAscii((network_number & 0x000000F0)>> 4);
			sendpacket[65] = CVHexToAscii(network_number & 0x0000000F);
			for(i = 66; i < 99; i+= 1)
			{
				sendpacket[i] = 0;
			}

			printk(KERN_INFO "%s: Sending IPXWAN Information Response packet\n",devname);
		}
		else
		{
			printk(KERN_INFO "%s: Unknown IPXWAN packet!\n",devname);
			return 0;
		}

		//Set the WNodeID to our network address
		sendpacket[35] = (unsigned char)(network_number >> 24);
		sendpacket[36] = (unsigned char)((network_number & 0x00FF0000) >> 16);
		sendpacket[37] = (unsigned char)((network_number & 0x0000FF00) >> 8);
		sendpacket[38] = (unsigned char)(network_number & 0x000000FF);

		return 1;
	} else {
		//If we get here's its an IPX-data packet, so it'll get passed up the stack.

		//switch the network numbers
		switch_net_numbers(sendpacket, network_number, 1);	
		return 0;
	}
}

/****** Background Polling Routines  ****************************************/

/* All polling functions are invoked by the TIMER interrupt in the wpp_isr 
 * routine.  
 */

/*============================================================================
 * Monitor active link phase.
 */
static void process_route (sdla_t *card)
{
	ppp_flags_t *flags = card->flags;
	struct net_device *dev = card->wandev.dev;
	struct in_device *in_dev = dev->ip_ptr;
	
	if (in_dev != NULL ) {
		if ((card->u.p.ip_mode == WANOPT_PPP_PEER) &&
		    (Read_connection_info && flags->ip_state == 0x09)){ 
		
			printk(KERN_INFO "%s: IPCP State Opened.\n", card->devname);
			if (read_info( card )) {
   				printk(KERN_INFO 
					"%s: An error occurred in IP assignment.\n", 
					card->devname);
			} else {
				struct in_ifaddr *ifa = in_dev->ifa_list;
				printk(KERN_INFO "%s: Assigned Lcl. Addr: %s\n", 
						card->devname, in_ntoa(ifa->ifa_local));
				printk(KERN_INFO "%s: Assigned Rmt. Addr: %s\n", 
						card->devname, in_ntoa(ifa->ifa_address));
			}
			Read_connection_info = 0;
		}
	}else{
		printk(KERN_INFO "%s: Error: Null pointer in Poll Active\n",
				card->devname);
	}
	card->poll = NULL;

}

/*============================================================================
 * Monitor physical link disconnected phase.
 *  o if interface is up and the hold-down timeout has expired, then retry
 *    connection.
 */
static void poll_disconnected(sdla_t *card)
{
	struct net_device *dev = card->wandev.dev;

	if (dev && netif_running(dev) &&
	    ((jiffies - card->state_tick) > HOLD_DOWN_TIME)) {
	
		wanpipe_set_state(card, WAN_CONNECTING);
		
		if(ppp_comm_enable(card) == CMD_OK){
			init_ppp_tx_rx_buff( card );
		}	         
		
	}
}

/****** Miscellaneous Functions *********************************************/

/*============================================================================
 * Configure S508 adapter.
 */
static int config508(ppp_private_area_t *ppp_priv_area, sdla_t *card)
{
	ppp508_conf_t cfg;
	struct net_device *dev = card->wandev.dev;
	struct in_device *in_dev = dev->ip_ptr;
	
	/* Prepare PPP configuration structure */
	memset(&cfg, 0, sizeof(ppp508_conf_t));

	if (card->wandev.clocking)
		cfg.line_speed = card->wandev.bps;

	if (card->wandev.interface == WANOPT_RS232)
		cfg.conf_flags |= INTERFACE_LEVEL_RS232;

        cfg.conf_flags 	|= DONT_TERMINATE_LNK_MAX_CONFIG; /*send Configure-Request packets forever*/
	cfg.txbuf_percent	= PERCENT_TX_BUFF;	/* % of Tx bufs */
	cfg.mtu_local		= card->wandev.mtu;
	cfg.mtu_remote		= card->wandev.mtu;                  /*    Default   */
	cfg.restart_tmr		= TIME_BETWEEN_CONF_REQ;  	     /*    30 = 3sec */
	cfg.auth_rsrt_tmr	= TIME_BETWEEN_PAP_CHAP_REQ;         /*    30 = 3sec */
	cfg.auth_wait_tmr	= WAIT_PAP_CHAP_WITHOUT_REPLY;       /*   300 = 30s  */
	cfg.mdm_fail_tmr	= WAIT_AFTER_DCD_CTS_LOW;            /*     5 = 0.5s */
	cfg.dtr_drop_tmr	= TIME_DCD_CTS_LOW_AFTER_LNK_DOWN;   /*    10 = 1s   */
	cfg.connect_tmout	= WAIT_DCD_HIGH_AFTER_ENABLE_COMM;   /*   900 = 90s  */
	cfg.conf_retry		= MAX_CONF_REQ_WITHOUT_REPLY;        /*    10 = 1s   */
	cfg.term_retry		= MAX_TERM_REQ_WITHOUT_REPLY;	     /*     2 times  */
	cfg.fail_retry		= NUM_CONF_NAK_WITHOUT_REPLY;        /*     5 times  */
	cfg.auth_retry		= NUM_AUTH_REQ_WITHOUT_REPLY;        /*     10 times */   


	if( !card->u.p.authenticator ) {
		printk(KERN_INFO "%s: Device is not configured as an authenticator\n", 
				card->devname);
		cfg.auth_options = NO_AUTHENTICATION;
	}else{
		printk(KERN_INFO "%s: Device is configured as an authenticator\n", 
				card->devname);
		cfg.auth_options = INBOUND_AUTH;
	}
	if( ppp_priv_area->pap == WANOPT_YES){
		cfg.auth_options |=PAP_AUTH;
		printk(KERN_INFO "%s: Pap enabled\n", card->devname);
	}
	if( ppp_priv_area->chap == WANOPT_YES){
		cfg.auth_options |= CHAP_AUTH;
		printk(KERN_INFO "%s: Chap enabled\n", card->devname);
	}


	if (ppp_priv_area->enable_IPX == WANOPT_YES){
		cfg.ipx_options		= ENABLE_IPX | ROUTING_PROT_DEFAULT;
	}else{
		cfg.ipx_options 	= DISABLE_IPX;
	}

	switch (card->u.p.ip_mode) {
	
		case WANOPT_PPP_STATIC:

			cfg.ip_options		= L_AND_R_IP_NO_ASSIG | 
							    ENABLE_IP;
			cfg.ip_local		= in_dev->ifa_list->ifa_local;
			cfg.ip_remote		= in_dev->ifa_list->ifa_address;
                        NEX_PRINTK(KERN_INFO "Local %s Remote %s Name %s\n",
					in_ntoa(cfg.ip_local), 
					in_ntoa(cfg.ip_remote), 
					dev->name);
			break;
	
		case WANOPT_PPP_PEER:
			cfg.ip_options		= L_IP_REMOTE_ASSIG | 
						  R_IP_REMOTE_ASSIG | 
							  ENABLE_IP;
			cfg.ip_local		= 0x00;
			cfg.ip_remote		= 0x00;
			break;
	
	}
	return ppp_configure(card, &cfg);
}

/*============================================================================
 * Show disconnection cause.
 */
static void show_disc_cause(sdla_t *card, unsigned cause)
{
	if (cause & 0x0802) 

		printk(KERN_INFO "%s: link terminated by peer\n", 
			card->devname);

	else if (cause & 0x0004) 

		printk(KERN_INFO "%s: link terminated by user\n", 
			card->devname);

	else if (cause & 0x0008) 

		printk(KERN_INFO "%s: authentication failed\n", card->devname);
	
	else if (cause & 0x0010) 

		printk(KERN_INFO 
			"%s: authentication protocol negotiation failed\n", 
			card->devname);

	else if (cause & 0x0020) 
		
		printk(KERN_INFO
		"%s: peer's request for authentication rejected\n",
		card->devname);

	else if (cause & 0x0040) 
	
		printk(KERN_INFO "%s: MRU option rejected by peer\n", 
		card->devname);

	else if (cause & 0x0080) 
	
		printk(KERN_INFO "%s: peer's MRU was too small\n", 
		card->devname);

	else if (cause & 0x0100) 

		printk(KERN_INFO "%s: failed to negotiate peer's LCP options\n",
		card->devname);

	else if (cause & 0x0200) 
		
		printk(KERN_INFO "%s: failed to negotiate peer's IPCP options\n"
		, card->devname);

	else if (cause & 0x0400) 

		printk(KERN_INFO 
			"%s: failed to negotiate peer's IPXCP options\n",
			card->devname);
}

/*=============================================================================
 * Process UDP call of type PTPIPEAB.
 */
static void process_udp_mgmt_pkt(sdla_t *card, struct net_device *dev, 
				 ppp_private_area_t *ppp_priv_area ) 
{
	unsigned char buf2[5];
	unsigned char *buf;
	unsigned int frames, len;
	struct sk_buff *new_skb;
	unsigned short data_length, buffer_length, real_len;
	unsigned long data_ptr;
	int udp_mgmt_req_valid = 1;
	ppp_mbox_t *mbox = card->mbox;
	struct timeval tv;
	int err;
	ppp_udp_pkt_t *ppp_udp_pkt = (ppp_udp_pkt_t*)&ppp_priv_area->udp_pkt_data;

	memcpy(&buf2, &card->wandev.udp_port, 2 );


	switch(ppp_udp_pkt->cblock.command) {

		/* FT1 MONITOR STATUS */
		case FT1_MONITOR_STATUS_CTRL:
		
		/* PPIPE_ENABLE_TRACING */
		case PPIPE_ENABLE_TRACING:
		   
		/* PPIPE_DISABLE_TRACING */
		case PPIPE_DISABLE_TRACING:
		   
		/* PPIPE_GET_TRACE_INFO */
		case PPIPE_GET_TRACE_INFO:
		   
		/* SET FT1 MODE */
		case SET_FT1_MODE:
			if(ppp_priv_area->udp_pkt_src == UDP_PKT_FRM_NETWORK) {
			
				++ppp_priv_area->pipe_mgmt_stat.
						UDP_PIPE_mgmt_direction_err;
				udp_mgmt_req_valid = 0;
			}	 
			break;
		   
		default:
			break;
	} 
	
  	if(!udp_mgmt_req_valid) {
	    
		/* set length to 0 */
    		ppp_udp_pkt->cblock.length = 0x00;

    		/* set return code */
    		ppp_udp_pkt->cblock.result = 0xCD; 

   	} else {
		/* Initialize the trace element */
		trace_element_t trace_element;		    

		switch (ppp_udp_pkt->cblock.command){

		/* PPIPE_ENABLE_TRACING */
    		case PPIPE_ENABLE_TRACING:
			if (!card->TracingEnabled) {
    			
				/* OPERATE_DATALINE_MONITOR */
    				mbox->cmd.command = PPP_DATALINE_MONITOR;
    				mbox->cmd.length = 0x01;
    				mbox->data[0] = ppp_udp_pkt->data[0];
	    			err = sdla_exec(mbox) ? 
					mbox->cmd.result : CMD_TIMEOUT;
	   
				if (err != CMD_OK) { 
	        			
					ppp_error(card, err, mbox);
	        			card->TracingEnabled = 0;
	        		
					/* set the return code */

		        		ppp_udp_pkt->cblock.result = mbox->cmd.result;
	        			mbox->cmd.length = 0;
	        			break;
	    			} 

				sdla_peek(&card->hw, 0xC000, &buf2, 2);
		    
				ppp_priv_area->curr_trace_addr = 0;
		    		memcpy(&ppp_priv_area->curr_trace_addr, &buf2, 2);
		    		ppp_priv_area->start_trace_addr = 
						ppp_priv_area->curr_trace_addr;
				ppp_priv_area->end_trace_addr = 
					ppp_priv_area->start_trace_addr + END_OFFSET;
		    	
				/* MAX_SEND_BUFFER_SIZE - 28 (IP header) 
				   - 32 (ppipemon CBLOCK) */
		    		available_buffer_space = MAX_LGTH_UDP_MGNT_PKT - 
							 sizeof(ip_pkt_t)-
							 sizeof(udp_pkt_t)-
							 sizeof(wp_mgmt_t)-
							 sizeof(cblock_t);
	       	  	}
	       	  	ppp_udp_pkt->cblock.result = 0;
	       	  	mbox->cmd.length = 0;
	       	  	card->TracingEnabled = 1;
	       	  	break;
	   
		/* PPIPE_DISABLE_TRACING */
		case PPIPE_DISABLE_TRACING:
	      		
			if(card->TracingEnabled) {
		   	
				/* OPERATE_DATALINE_MONITOR */
		    		mbox->cmd.command = 0x33;
		    		mbox->cmd.length = 1;
		    		mbox->data[0] = 0x00;
		    		err = sdla_exec(mbox) ? 
					mbox->cmd.result : CMD_TIMEOUT;
	       	  
			} 
		
			/*set return code*/
			ppp_udp_pkt->cblock.result = 0;
			mbox->cmd.length = 0;
			card->TracingEnabled = 0;
			break;
	   
		/* PPIPE_GET_TRACE_INFO */
		case PPIPE_GET_TRACE_INFO: