1 | /*
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2 | * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without modification,
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6 | * are permitted provided that the following conditions are met:
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7 | *
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8 | * 1. Redistributions of source code must retain the above copyright notice,
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9 | * this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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11 | * this list of conditions and the following disclaimer in the documentation
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12 | * and/or other materials provided with the distribution.
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13 | * 3. The name of the author may not be used to endorse or promote products
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14 | * derived from this software without specific prior written permission.
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15 | *
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16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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19 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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20 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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21 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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24 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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25 | * OF SUCH DAMAGE.
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26 | *
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27 | * This file is part of the lwIP TCP/IP stack.
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28 | *
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29 | * Author: Adam Dunkels <adam@sics.se>
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30 | *
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31 | */
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32 |
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33 | #include <fcntl.h>
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34 | #include <stdlib.h>
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35 | #include <stdio.h>
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36 | #include <unistd.h>
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37 | #include <string.h>
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38 | #include <sys/ioctl.h>
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39 | #include <sys/socket.h>
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40 | #include <sys/types.h>
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41 | #include <sys/time.h>
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42 | #include <sys/uio.h>
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43 | #include <sys/socket.h>
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44 |
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45 | #include "lwip/opt.h"
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46 |
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47 | #include "lwip/debug.h"
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48 | #include "lwip/def.h"
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49 | #include "lwip/ip.h"
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50 | #include "lwip/mem.h"
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51 | #include "lwip/stats.h"
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52 | #include "lwip/snmp.h"
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53 | #include "lwip/pbuf.h"
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54 | #include "lwip/sys.h"
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55 | #include "lwip/timeouts.h"
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56 | #include "netif/etharp.h"
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57 | #include "lwip/ethip6.h"
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58 |
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59 | #include "netif/tapif.h"
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60 |
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61 | #define IFCONFIG_BIN "/sbin/ifconfig "
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62 |
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63 | #if defined(LWIP_UNIX_LINUX)
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64 | #include <sys/ioctl.h>
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65 | #include <linux/if.h>
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66 | #include <linux/if_tun.h>
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67 | /*
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68 | * Creating a tap interface requires special privileges. If the interfaces
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69 | * is created in advance with `tunctl -u <user>` it can be opened as a regular
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70 | * user. The network must already be configured. If DEVTAP_IF is defined it
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71 | * will be opened instead of creating a new tap device.
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72 | *
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73 | * You can also use PRECONFIGURED_TAPIF environment variable to do so.
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74 | */
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75 | #ifndef DEVTAP_DEFAULT_IF
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76 | #define DEVTAP_DEFAULT_IF "tap0"
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77 | #endif
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78 | #ifndef DEVTAP
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79 | #define DEVTAP "/dev/net/tun"
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80 | #endif
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81 | #define NETMASK_ARGS "netmask %d.%d.%d.%d"
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82 | #define IFCONFIG_ARGS "tap0 inet %d.%d.%d.%d " NETMASK_ARGS
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83 | #elif defined(LWIP_UNIX_OPENBSD)
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84 | #define DEVTAP "/dev/tun0"
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85 | #define NETMASK_ARGS "netmask %d.%d.%d.%d"
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86 | #define IFCONFIG_ARGS "tun0 inet %d.%d.%d.%d " NETMASK_ARGS " link0"
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87 | #else /* others */
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88 | #define DEVTAP "/dev/tap0"
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89 | #define NETMASK_ARGS "netmask %d.%d.%d.%d"
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90 | #define IFCONFIG_ARGS "tap0 inet %d.%d.%d.%d " NETMASK_ARGS
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91 | #endif
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92 |
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93 | /* Define those to better describe your network interface. */
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94 | #define IFNAME0 't'
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95 | #define IFNAME1 'p'
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96 |
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97 | #ifndef TAPIF_DEBUG
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98 | #define TAPIF_DEBUG LWIP_DBG_OFF
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99 | #endif
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100 |
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101 | struct tapif {
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102 | /* Add whatever per-interface state that is needed here. */
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103 | int fd;
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104 | };
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105 |
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106 | /* Forward declarations. */
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107 | static void tapif_input(struct netif *netif);
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108 | #if !NO_SYS
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109 | static void tapif_thread(void *arg);
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110 | #endif /* !NO_SYS */
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111 |
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112 | /*-----------------------------------------------------------------------------------*/
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113 | static void
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114 | low_level_init(struct netif *netif)
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115 | {
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116 | struct tapif *tapif;
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117 | #if LWIP_IPV4
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118 | int ret;
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119 | char buf[1024];
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120 | #endif /* LWIP_IPV4 */
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121 | char *preconfigured_tapif = getenv("PRECONFIGURED_TAPIF");
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122 |
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123 | tapif = (struct tapif *)netif->state;
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124 |
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125 | /* Obtain MAC address from network interface. */
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126 |
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127 | /* (We just fake an address...) */
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128 | netif->hwaddr[0] = 0x02;
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129 | netif->hwaddr[1] = 0x12;
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130 | netif->hwaddr[2] = 0x34;
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131 | netif->hwaddr[3] = 0x56;
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132 | netif->hwaddr[4] = 0x78;
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133 | netif->hwaddr[5] = 0xab;
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134 | netif->hwaddr_len = 6;
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135 |
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136 | /* device capabilities */
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137 | netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_IGMP;
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138 |
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139 | tapif->fd = open(DEVTAP, O_RDWR);
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140 | LWIP_DEBUGF(TAPIF_DEBUG, ("tapif_init: fd %d\n", tapif->fd));
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141 | if (tapif->fd == -1) {
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142 | #ifdef LWIP_UNIX_LINUX
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143 | perror("tapif_init: try running \"modprobe tun\" or rebuilding your kernel with CONFIG_TUN; cannot open "DEVTAP);
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144 | #else /* LWIP_UNIX_LINUX */
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145 | perror("tapif_init: cannot open "DEVTAP);
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146 | #endif /* LWIP_UNIX_LINUX */
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147 | exit(1);
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148 | }
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149 |
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150 | #ifdef LWIP_UNIX_LINUX
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151 | {
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152 | struct ifreq ifr;
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153 | memset(&ifr, 0, sizeof(ifr));
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154 |
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155 | if (preconfigured_tapif) {
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156 | strncpy(ifr.ifr_name, preconfigured_tapif, sizeof(ifr.ifr_name));
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157 | } else {
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158 | strncpy(ifr.ifr_name, DEVTAP_DEFAULT_IF, sizeof(ifr.ifr_name));
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159 | }
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160 | ifr.ifr_name[sizeof(ifr.ifr_name)-1] = 0; /* ensure \0 termination */
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161 |
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162 | ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
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163 | if (ioctl(tapif->fd, TUNSETIFF, (void *) &ifr) < 0) {
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164 | perror("tapif_init: "DEVTAP" ioctl TUNSETIFF");
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165 | exit(1);
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166 | }
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167 | }
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168 | #endif /* LWIP_UNIX_LINUX */
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169 |
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170 | netif_set_link_up(netif);
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171 |
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172 | if (preconfigured_tapif == NULL) {
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173 | #if LWIP_IPV4
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174 | snprintf(buf, 1024, IFCONFIG_BIN IFCONFIG_ARGS,
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175 | ip4_addr1(netif_ip4_gw(netif)),
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176 | ip4_addr2(netif_ip4_gw(netif)),
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177 | ip4_addr3(netif_ip4_gw(netif)),
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178 | ip4_addr4(netif_ip4_gw(netif))
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179 | #ifdef NETMASK_ARGS
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180 | ,
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181 | ip4_addr1(netif_ip4_netmask(netif)),
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182 | ip4_addr2(netif_ip4_netmask(netif)),
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183 | ip4_addr3(netif_ip4_netmask(netif)),
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184 | ip4_addr4(netif_ip4_netmask(netif))
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185 | #endif /* NETMASK_ARGS */
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186 | );
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187 |
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188 | LWIP_DEBUGF(TAPIF_DEBUG, ("tapif_init: system(\"%s\");\n", buf));
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189 | ret = system(buf);
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190 | if (ret < 0) {
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191 | perror("ifconfig failed");
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192 | exit(1);
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193 | }
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194 | if (ret != 0) {
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195 | printf("ifconfig returned %d\n", ret);
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196 | }
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197 | #else /* LWIP_IPV4 */
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198 | perror("todo: support IPv6 support for non-preconfigured tapif");
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199 | exit(1);
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200 | #endif /* LWIP_IPV4 */
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201 | }
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202 |
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203 | #if !NO_SYS
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204 | sys_thread_new("tapif_thread", tapif_thread, netif, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
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205 | #endif /* !NO_SYS */
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206 | }
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207 | /*-----------------------------------------------------------------------------------*/
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208 | /*
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209 | * low_level_output():
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210 | *
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211 | * Should do the actual transmission of the packet. The packet is
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212 | * contained in the pbuf that is passed to the function. This pbuf
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213 | * might be chained.
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214 | *
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215 | */
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216 | /*-----------------------------------------------------------------------------------*/
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217 |
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218 | static err_t
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219 | low_level_output(struct netif *netif, struct pbuf *p)
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220 | {
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221 | struct tapif *tapif = (struct tapif *)netif->state;
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222 | char buf[1518]; /* max packet size including VLAN excluding CRC */
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223 | ssize_t written;
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224 |
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225 | #if 0
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226 | if (((double)rand()/(double)RAND_MAX) < 0.2) {
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227 | printf("drop output\n");
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228 | return ERR_OK; /* ERR_OK because we simulate packet loss on cable */
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229 | }
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230 | #endif
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231 |
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232 | if (p->tot_len > sizeof(buf)) {
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233 | MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
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234 | perror("tapif: packet too large");
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235 | return ERR_IF;
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236 | }
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237 |
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238 | /* initiate transfer(); */
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239 | pbuf_copy_partial(p, buf, p->tot_len, 0);
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240 |
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241 | /* signal that packet should be sent(); */
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242 | written = write(tapif->fd, buf, p->tot_len);
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243 | if (written < p->tot_len) {
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244 | MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
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245 | perror("tapif: write");
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246 | return ERR_IF;
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247 | } else {
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248 | MIB2_STATS_NETIF_ADD(netif, ifoutoctets, (u32_t)written);
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249 | return ERR_OK;
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250 | }
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251 | }
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252 | /*-----------------------------------------------------------------------------------*/
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253 | /*
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254 | * low_level_input():
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255 | *
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256 | * Should allocate a pbuf and transfer the bytes of the incoming
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257 | * packet from the interface into the pbuf.
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258 | *
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259 | */
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260 | /*-----------------------------------------------------------------------------------*/
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261 | static struct pbuf *
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262 | low_level_input(struct netif *netif)
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263 | {
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264 | struct pbuf *p;
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265 | u16_t len;
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266 | ssize_t readlen;
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267 | char buf[1518]; /* max packet size including VLAN excluding CRC */
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268 | struct tapif *tapif = (struct tapif *)netif->state;
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269 |
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270 | /* Obtain the size of the packet and put it into the "len"
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271 | variable. */
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272 | readlen = read(tapif->fd, buf, sizeof(buf));
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273 | if (readlen < 0) {
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274 | perror("read returned -1");
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275 | exit(1);
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276 | }
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277 | len = (u16_t)readlen;
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278 |
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279 | MIB2_STATS_NETIF_ADD(netif, ifinoctets, len);
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280 |
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281 | #if 0
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282 | if (((double)rand()/(double)RAND_MAX) < 0.2) {
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283 | printf("drop\n");
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284 | return NULL;
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285 | }
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286 | #endif
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287 |
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288 | /* We allocate a pbuf chain of pbufs from the pool. */
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289 | p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
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290 | if (p != NULL) {
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291 | pbuf_take(p, buf, len);
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292 | /* acknowledge that packet has been read(); */
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293 | } else {
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294 | /* drop packet(); */
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295 | MIB2_STATS_NETIF_INC(netif, ifindiscards);
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296 | LWIP_DEBUGF(NETIF_DEBUG, ("tapif_input: could not allocate pbuf\n"));
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297 | }
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298 |
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299 | return p;
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300 | }
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301 |
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302 | /*-----------------------------------------------------------------------------------*/
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303 | /*
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304 | * tapif_input():
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305 | *
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306 | * This function should be called when a packet is ready to be read
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307 | * from the interface. It uses the function low_level_input() that
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308 | * should handle the actual reception of bytes from the network
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309 | * interface.
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310 | *
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311 | */
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312 | /*-----------------------------------------------------------------------------------*/
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313 | static void
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314 | tapif_input(struct netif *netif)
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315 | {
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316 | struct pbuf *p = low_level_input(netif);
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317 |
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318 | if (p == NULL) {
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319 | #if LINK_STATS
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320 | LINK_STATS_INC(link.recv);
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321 | #endif /* LINK_STATS */
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322 | LWIP_DEBUGF(TAPIF_DEBUG, ("tapif_input: low_level_input returned NULL\n"));
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323 | return;
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324 | }
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325 |
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326 | if (netif->input(p, netif) != ERR_OK) {
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327 | LWIP_DEBUGF(NETIF_DEBUG, ("tapif_input: netif input error\n"));
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328 | pbuf_free(p);
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329 | }
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330 | }
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331 | /*-----------------------------------------------------------------------------------*/
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332 | /*
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333 | * tapif_init():
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334 | *
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335 | * Should be called at the beginning of the program to set up the
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336 | * network interface. It calls the function low_level_init() to do the
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337 | * actual setup of the hardware.
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338 | *
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339 | */
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340 | /*-----------------------------------------------------------------------------------*/
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341 | err_t
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342 | tapif_init(struct netif *netif)
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343 | {
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344 | struct tapif *tapif = (struct tapif *)mem_malloc(sizeof(struct tapif));
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345 |
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346 | if (tapif == NULL) {
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347 | LWIP_DEBUGF(NETIF_DEBUG, ("tapif_init: out of memory for tapif\n"));
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348 | return ERR_MEM;
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349 | }
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350 | netif->state = tapif;
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351 | MIB2_INIT_NETIF(netif, snmp_ifType_other, 100000000);
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352 |
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353 | netif->name[0] = IFNAME0;
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354 | netif->name[1] = IFNAME1;
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355 | #if LWIP_IPV4
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356 | netif->output = etharp_output;
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357 | #endif /* LWIP_IPV4 */
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358 | #if LWIP_IPV6
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359 | netif->output_ip6 = ethip6_output;
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360 | #endif /* LWIP_IPV6 */
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361 | netif->linkoutput = low_level_output;
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362 | netif->mtu = 1500;
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363 |
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364 | low_level_init(netif);
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365 |
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366 | return ERR_OK;
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367 | }
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368 |
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369 |
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370 | /*-----------------------------------------------------------------------------------*/
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371 | void
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372 | tapif_poll(struct netif *netif)
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373 | {
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374 | tapif_input(netif);
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375 | }
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376 |
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377 | #if NO_SYS
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378 |
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379 | int
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380 | tapif_select(struct netif *netif)
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381 | {
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382 | fd_set fdset;
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383 | int ret;
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384 | struct timeval tv;
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385 | struct tapif *tapif;
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386 | u32_t msecs = sys_timeouts_sleeptime();
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387 |
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388 | tapif = (struct tapif *)netif->state;
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389 |
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390 | tv.tv_sec = msecs / 1000;
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391 | tv.tv_usec = (msecs % 1000) * 1000;
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392 |
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393 | FD_ZERO(&fdset);
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394 | FD_SET(tapif->fd, &fdset);
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395 |
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396 | ret = select(tapif->fd + 1, &fdset, NULL, NULL, &tv);
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397 | if (ret > 0) {
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398 | tapif_input(netif);
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399 | }
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400 | return ret;
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401 | }
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402 |
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403 | #else /* NO_SYS */
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404 |
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405 | static void
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406 | tapif_thread(void *arg)
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407 | {
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408 | struct netif *netif;
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409 | struct tapif *tapif;
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410 | fd_set fdset;
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411 | int ret;
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412 |
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413 | netif = (struct netif *)arg;
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414 | tapif = (struct tapif *)netif->state;
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415 |
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416 | while(1) {
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417 | FD_ZERO(&fdset);
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418 | FD_SET(tapif->fd, &fdset);
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419 |
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420 | /* Wait for a packet to arrive. */
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421 | ret = select(tapif->fd + 1, &fdset, NULL, NULL, NULL);
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422 |
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423 | if(ret == 1) {
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424 | /* Handle incoming packet. */
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425 | tapif_input(netif);
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426 | } else if(ret == -1) {
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427 | perror("tapif_thread: select");
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428 | }
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429 | }
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430 | }
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431 |
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432 | #endif /* NO_SYS */
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