1 /* 2 * Copyright (c) 2001, Swedish Institute of Computer Science. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * 3. Neither the name of the Institute nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * Author: Adam Dunkels <[email protected]> 33 * 34 * $Id: tapdev.c,v 1.8 2006/06/07 08:39:58 adam Exp $ 35 */ 36 37 #define UIP_DRIPADDR0 192 38 #define UIP_DRIPADDR1 168 39 #define UIP_DRIPADDR2 0 40 #define UIP_DRIPADDR3 1 41 42 #include <fcntl.h> 43 #include <stdlib.h> 44 #include <stdio.h> 45 #include <unistd.h> 46 #include <string.h> 47 #include <sys/ioctl.h> 48 #include <sys/socket.h> 49 #include <sys/types.h> 50 #include <sys/time.h> 51 #include <sys/uio.h> 52 #include <sys/socket.h> 53 54 #ifdef linux 55 #include <sys/ioctl.h> 56 #include <linux/if.h> 57 #include <linux/if_tun.h> 58 #define DEVTAP "/dev/net/tun" 59 #else /* linux */ 60 #define DEVTAP "/dev/tap0" 61 #endif /* linux */ 62 63 #include "uip.h" 64 65 static int drop = 0; 66 static int fd; 67 68 69 /*---------------------------------------------------------------------------*/ 70 void 71 tapdev_init(void) 72 { 73 char buf[1024]; 74 75 fd = open(DEVTAP, O_RDWR); 76 if(fd == -1) { 77 perror("tapdev: tapdev_init: open"); 78 exit(1); 79 } 80 81 #ifdef linux 82 { 83 struct ifreq ifr; 84 memset(&ifr, 0, sizeof(ifr)); 85 ifr.ifr_flags = IFF_TAP|IFF_NO_PI; 86 if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) { 87 perror(buf); 88 exit(1); 89 } 90 } 91 #endif /* Linux */ 92 93 snprintf(buf, sizeof(buf), "ifconfig tap0 inet %d.%d.%d.%d", 94 UIP_DRIPADDR0, UIP_DRIPADDR1, UIP_DRIPADDR2, UIP_DRIPADDR3); 95 system(buf); 96 97 } 98 /*---------------------------------------------------------------------------*/ 99 unsigned int 100 tapdev_read(void) 101 { 102 fd_set fdset; 103 struct timeval tv, now; 104 int ret; 105 106 tv.tv_sec = 0; 107 tv.tv_usec = 1000; 108 109 110 FD_ZERO(&fdset); 111 FD_SET(fd, &fdset); 112 113 ret = select(fd + 1, &fdset, NULL, NULL, &tv); 114 if(ret == 0) { 115 return 0; 116 } 117 ret = read(fd, uip_buf, UIP_BUFSIZE); 118 if(ret == -1) { 119 perror("tap_dev: tapdev_read: read"); 120 } 121 122 /* printf("--- tap_dev: tapdev_read: read %d bytes\n", ret);*/ 123 /* { 124 int i; 125 for(i = 0; i < 20; i++) { 126 printf("%x ", uip_buf[i]); 127 } 128 printf("\n"); 129 }*/ 130 /* check_checksum(uip_buf, ret);*/ 131 return ret; 132 } 133 /*---------------------------------------------------------------------------*/ 134 void 135 tapdev_send(void) 136 { 137 int ret; 138 /* printf("tapdev_send: sending %d bytes\n", size);*/ 139 /* check_checksum(uip_buf, size);*/ 140 141 /* drop++; 142 if(drop % 8 == 7) { 143 printf("Dropped a packet!\n"); 144 return; 145 }*/ 146 ret = write(fd, uip_buf, uip_len); 147 if(ret == -1) { 148 perror("tap_dev: tapdev_send: writev"); 149 exit(1); 150 } 151 } 152 /*---------------------------------------------------------------------------*/ 153