nes-proj/cpu/native/net/tapdev.c

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/*
* Copyright (c) 2001, 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.
*
* Author: Adam Dunkels <adam@sics.se>
*
*/
#include "net/ip/uip.h"
#include "net/ip/uipopt.h"
#if !NETSTACK_CONF_WITH_IPV6
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/socket.h>
#ifdef linux
#include <sys/ioctl.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#define DEVTAP "/dev/net/tun"
#else /* linux */
#define DEVTAP "/dev/tap0"
#endif /* linux */
#include "contiki-net.h"
#include "tapdev.h"
#define DROP 0
#if DROP
static int drop = 0;
#endif
static int fd;
static unsigned long lasttime;
#define BUF ((struct uip_eth_hdr *)&uip_buf[0])
#define DEBUG 0
#if DEBUG
#define PRINTF(...) fprintf(stderr, __VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
int
tapdev_fd(void)
{
return fd;
}
/*---------------------------------------------------------------------------*/
static void
remove_route(void)
{
char buf[1024];
snprintf(buf, sizeof(buf), "route delete -net 172.18.0.0");
system(buf);
fprintf(stderr, "%s\n", buf);
}
/*---------------------------------------------------------------------------*/
void
tapdev_init(void)
{
char buf[1024];
fd = open(DEVTAP, O_RDWR);
if(fd == -1) {
perror("tapdev: tapdev_init: open");
return;
}
#ifdef linux
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
perror("ioctl(TUNSETIFF)");
exit(1);
}
}
#endif /* Linux */
snprintf(buf, sizeof(buf), "ifconfig tap0 inet 172.18.0.1/16");
system(buf);
fprintf(stderr, "%s\n", buf);
#ifdef linux
/* route add for linux */
snprintf(buf, sizeof(buf), "route add -net 172.18.0.0/16 dev tap0");
#else /* linux */
/* route add for freebsd */
snprintf(buf, sizeof(buf), "route add -net 172.18.0.0/16 -iface tap0");
#endif /* linux */
system(buf);
fprintf(stderr, "%s\n", buf);
atexit(remove_route);
lasttime = 0;
}
/*---------------------------------------------------------------------------*/
uint16_t
tapdev_poll(void)
{
fd_set fdset;
struct timeval tv;
int ret;
tv.tv_sec = 0;
tv.tv_usec = 0;
FD_ZERO(&fdset);
if(fd > 0) {
FD_SET(fd, &fdset);
}
ret = select(fd + 1, &fdset, NULL, NULL, &tv);
if(ret == 0) {
return 0;
}
ret = read(fd, uip_buf, UIP_BUFSIZE);
PRINTF("tapdev_poll: read %d bytes\n", ret);
if(ret == -1) {
perror("tapdev_poll: read");
}
return ret;
}
/*---------------------------------------------------------------------------*/
void
tapdev_send(void)
{
int ret;
if(fd <= 0) {
return;
}
/* printf("tapdev_send: sending %d bytes\n", size);*/
/* check_checksum(uip_buf, size);*/
#if DROP
drop++;
if(drop % 8 == 7) {
fprintf(stderr, "Dropped an output packet!\n");
return;
}
#endif /* DROP */
PRINTF("tapdev_send: sending %d bytes\n", uip_len);
ret = write(fd, uip_buf, uip_len);
if(ret == -1) {
perror("tap_dev: tapdev_send: writev");
exit(1);
}
}
/*---------------------------------------------------------------------------*/
void
tapdev_exit(void)
{
}
/*---------------------------------------------------------------------------*/
#endif /* !NETSTACK_CONF_WITH_IPV6 */