[457] | 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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