tapdev-drv.c

00001 /*
00002  * Copyright (c) 2005, Swedish Institute of Computer Science
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * This file is part of the Contiki operating system.
00030  *
00031  * @(#)$Id: tapdev-drv.c,v 1.6 2010/10/19 18:29:04 adamdunkels Exp $
00032  */
00033 
00034 #include "contiki-net.h"
00035 
00036 #if UIP_CONF_IPV6
00037 #include "tapdev6.h"
00038 #else
00039 #include "tapdev.h"
00040 #endif /* UIP_CONF_IPV6 */
00041 
00042 #include "tapdev-drv.h"
00043 
00044 #define BUF ((struct uip_eth_hdr *)&uip_buf[0])
00045 #define IPBUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
00046 
00047 PROCESS(tapdev_process, "TAP driver");
00048 
00049 /*---------------------------------------------------------------------------*/
00050 #if !UIP_CONF_IPV6
00051 u8_t
00052 tapdev_output(void)
00053 {
00054    uip_arp_out();
00055    tapdev_send();  
00056    return 0;
00057 }
00058 #endif
00059 /*---------------------------------------------------------------------------*/
00060 static void
00061 pollhandler(void)
00062 {
00063   process_poll(&tapdev_process);
00064   uip_len = tapdev_poll();
00065 
00066   if(uip_len > 0) {
00067 #if UIP_CONF_IPV6
00068     if(BUF->type == uip_htons(UIP_ETHTYPE_IPV6)) {
00069       tcpip_input();
00070     } else
00071 #endif /* UIP_CONF_IPV6 */
00072     if(BUF->type == uip_htons(UIP_ETHTYPE_IP)) {
00073       uip_len -= sizeof(struct uip_eth_hdr);
00074       tcpip_input();
00075     } else if(BUF->type == uip_htons(UIP_ETHTYPE_ARP)) {
00076 #if !UIP_CONF_IPV6 //math
00077        uip_arp_arpin();
00078        /* If the above function invocation resulted in data that
00079           should be sent out on the network, the global variable
00080           uip_len is set to a value > 0. */
00081        if(uip_len > 0) {
00082           tapdev_send();
00083        }
00084 #endif              
00085     } else {
00086       uip_len = 0;
00087     }
00088   }
00089 }
00090 /*---------------------------------------------------------------------------*/
00091 PROCESS_THREAD(tapdev_process, ev, data)
00092 {
00093   PROCESS_POLLHANDLER(pollhandler());
00094 
00095   PROCESS_BEGIN();
00096 
00097   tapdev_init();
00098 #if !UIP_CONF_IPV6
00099   tcpip_set_outputfunc(tapdev_output);
00100 #else
00101   tcpip_set_outputfunc(tapdev_send);
00102 #endif
00103   process_poll(&tapdev_process);
00104 
00105   PROCESS_WAIT_UNTIL(ev == PROCESS_EVENT_EXIT);
00106 
00107   tapdev_exit();
00108 
00109   PROCESS_END();
00110 }
00111 /*---------------------------------------------------------------------------*/

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