0,0 → 1,171 |
/* |
* 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> |
* |
* $Id: tapdev.c,v 1.7.2.1 2003/10/07 13:23:19 adam Exp $ |
*/ |
|
|
#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 "uip.h" |
|
static int fd; |
|
static unsigned long lasttime; |
static struct timezone tz; |
|
/*-----------------------------------------------------------------------------------*/ |
void |
tapdev_init(void) |
{ |
char buf[1024]; |
|
fd = open(DEVTAP, O_RDWR); |
if(fd == -1) { |
perror("tapdev: tapdev_init: open"); |
exit(1); |
} |
|
#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(buf); |
exit(1); |
} |
} |
#endif /* Linux */ |
|
snprintf(buf, sizeof(buf), "ifconfig tap0 inet %d.%d.%d.%d", |
UIP_DRIPADDR0, UIP_DRIPADDR1, UIP_DRIPADDR2, UIP_DRIPADDR3); |
system(buf); |
|
lasttime = 0; |
} |
/*-----------------------------------------------------------------------------------*/ |
unsigned int |
tapdev_read(void) |
{ |
fd_set fdset; |
struct timeval tv, now; |
int ret; |
|
if(lasttime >= 500000) { |
lasttime = 0; |
return 0; |
} |
|
tv.tv_sec = 0; |
tv.tv_usec = 500000 - lasttime; |
|
|
FD_ZERO(&fdset); |
FD_SET(fd, &fdset); |
|
gettimeofday(&now, &tz); |
ret = select(fd + 1, &fdset, NULL, NULL, &tv); |
if(ret == 0) { |
lasttime = 0; |
return 0; |
} |
ret = read(fd, uip_buf, UIP_BUFSIZE); |
if(ret == -1) { |
perror("tap_dev: tapdev_read: read"); |
} |
gettimeofday(&tv, &tz); |
lasttime += (tv.tv_sec - now.tv_sec) * 1000000 + (tv.tv_usec - now.tv_usec); |
|
return ret; |
} |
/*-----------------------------------------------------------------------------------*/ |
void |
tapdev_send(void) |
{ |
int ret; |
struct iovec iov[2]; |
|
#ifdef linux |
{ |
char tmpbuf[UIP_BUFSIZE]; |
int i; |
|
for(i = 0; i < 40 + UIP_LLH_LEN; i++) { |
tmpbuf[i] = uip_buf[i]; |
} |
|
for(; i < uip_len; i++) { |
tmpbuf[i] = uip_appdata[i - 40 - UIP_LLH_LEN]; |
} |
|
ret = write(fd, tmpbuf, uip_len); |
} |
#else |
|
if(uip_len < 40 + UIP_LLH_LEN) { |
ret = write(fd, uip_buf, uip_len + UIP_LLH_LEN); |
} else { |
iov[0].iov_base = uip_buf; |
iov[0].iov_len = 40 + UIP_LLH_LEN; |
iov[1].iov_base = (char *)uip_appdata; |
iov[1].iov_len = uip_len - (40 + UIP_LLH_LEN); |
|
ret = writev(fd, iov, 2); |
} |
#endif |
if(ret == -1) { |
perror("tap_dev: tapdev_send: writev"); |
exit(1); |
} |
} |
/*-----------------------------------------------------------------------------------*/ |