contiki/cpu/native/net/wpcap-drv.c

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/*
* Copyright (c) 2007, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
#include "contiki-net.h"
#include "net/ipv4/uip-neighbor.h"
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#include "net/wpcap.h"
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#include "net/wpcap-drv.h"
#include <string.h>
#define BUF ((struct uip_eth_hdr *)&uip_buf[0])
#define IPBUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
/* It is not particularly easy to install tun interfaces in Windows/cygwin, so wpcap
* is used instead. The ip4 or ip6 address of the interface to connect to is passed
* on the command line that invokes the minimal-net and native executables.
*
* The minimal-net border router uses wpcap to connect to both primary
* and fallback interfaces. It is passed two addresses, and the uip stack is compiled
* with space for the ethernet headers on both interfaces.
*
* However the native border router uses wpcap to connect to a fallback interface only.
* The primary interface is the serial connection to the slip radio, and the
* uip stack is compiled without space for ethernet headers.
* The following define adds or strips ethernet headers from the fallback interface.
* Since it is at present used only with the native border router, it is also used
* as a hack to bypass polling of the primary interface.
*
* SELECT_CALLBACK is defined in /examples/ipv6/native-border-router/project-conf.h
*/
#ifdef SELECT_CALLBACK
#define FALLBACK_HAS_ETHERNET_HEADERS 1
#endif
PROCESS(wpcap_process, "WinPcap driver");
/*---------------------------------------------------------------------------*/
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#if !UIP_CONF_IPV6
uint8_t
wpcap_output(void)
{
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uip_arp_out();
wpcap_send();
return 0;
}
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#endif /* !UIP_CONF_IPV6 */
/*---------------------------------------------------------------------------*/
static void
pollhandler(void)
{
#if !FALLBACK_HAS_ETHERNET_HEADERS //native br is fallback only
process_poll(&wpcap_process);
uip_len = wpcap_poll();
if(uip_len > 0) {
#if UIP_CONF_IPV6
if(BUF->type == uip_htons(UIP_ETHTYPE_IPV6)) {
// printf("wpcap poll calls tcpip");
tcpip_input();
} else
#endif /* UIP_CONF_IPV6 */
if(BUF->type == uip_htons(UIP_ETHTYPE_IP)) {
uip_len -= sizeof(struct uip_eth_hdr);
tcpip_input();
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#if !UIP_CONF_IPV6
} else if(BUF->type == uip_htons(UIP_ETHTYPE_ARP)) {
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uip_arp_arpin(); //math
/* If the above function invocation resulted in data that
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should be sent out on the network, the global variable
uip_len is set to a value > 0. */
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if(uip_len > 0) {
wpcap_send();
}
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#endif /* !UIP_CONF_IPV6 */
} else {
uip_len = 0;
}
}
#endif
#ifdef UIP_FALLBACK_INTERFACE
process_poll(&wpcap_process);
uip_len = wfall_poll();
if(uip_len > 0) {
#if FALLBACK_HAS_ETHERNET_HEADERS
if(BUF->type == uip_htons(UIP_ETHTYPE_IPV6)) {
//remove ethernet header and pass ipv6 packet to stack
uip_len-=14;
//{int i;printf("\n0000 ");for (i=0;i<uip_len;i++) printf("%02x ",*(unsigned char*)(uip_buf+i));printf("\n");}
// memcpy(uip_buf, uip_buf+14, uip_len);
memcpy(&uip_buf[UIP_LLH_LEN], uip_buf+14, uip_len); //LLH_LEN is zero for native border router to slip radio
// CopyMemory(uip_buf, uip_buf+14, uip_len);
//{int i;printf("\n0000 ");for (i=0;i<uip_len;i++) printf("%02x ",*(char*)(uip_buf+i));printf("\n");}
tcpip_input();
} else
goto bail;
#elif UIP_CONF_IPV6
if(BUF->type == uip_htons(UIP_ETHTYPE_IPV6)) {
tcpip_input();
} else
goto bail;
#endif /* UIP_CONF_IPV6 */
if(BUF->type == uip_htons(UIP_ETHTYPE_IP)) {
uip_len -= sizeof(struct uip_eth_hdr);
tcpip_input();
#if !UIP_CONF_IPV6
} else if(BUF->type == uip_htons(UIP_ETHTYPE_ARP)) {
uip_arp_arpin(); //math
/* If the above function invocation resulted in data that
should be sent out on the network, the global variable
uip_len is set to a value > 0. */
if(uip_len > 0) {
wfall_send();
}
#endif /* !UIP_CONF_IPV6 */
} else {
bail:
uip_len = 0;
}
}
#endif
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(wpcap_process, ev, data)
{
PROCESS_POLLHANDLER(pollhandler());
PROCESS_BEGIN();
wpcap_init();
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#if !UIP_CONF_IPV6
tcpip_set_outputfunc(wpcap_output);
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#else
#if !FALLBACK_HAS_ETHERNET_HEADERS
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tcpip_set_outputfunc(wpcap_send);
#endif
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#endif /* !UIP_CONF_IPV6 */
process_poll(&wpcap_process);
PROCESS_WAIT_UNTIL(ev == PROCESS_EVENT_EXIT);
wpcap_exit();
PROCESS_END();
}
/*---------------------------------------------------------------------------*/