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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [uIP_Demo_Rowley_ARM7/] [uip/] [tapdev.c] - Rev 827
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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> * * $Id: tapdev.c 2 2011-07-17 20:13:17Z filepang@gmail.com $ */ #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); } } /*-----------------------------------------------------------------------------------*/
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