diff options
Diffstat (limited to 'tools/ioemu/iodev/eth_tuntap.cc')
| -rw-r--r-- | tools/ioemu/iodev/eth_tuntap.cc | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/tools/ioemu/iodev/eth_tuntap.cc b/tools/ioemu/iodev/eth_tuntap.cc new file mode 100644 index 0000000000..f910fd55f1 --- /dev/null +++ b/tools/ioemu/iodev/eth_tuntap.cc @@ -0,0 +1,401 @@ +///////////////////////////////////////////////////////////////////////// +// $Id: eth_tuntap.cc,v 1.9 2003/04/26 14:48:45 cbothamy Exp $ +///////////////////////////////////////////////////////////////////////// +// +// Copyright (C) 2001 MandrakeSoft S.A. +// +// MandrakeSoft S.A. +// 43, rue d'Aboukir +// 75002 Paris - France +// http://www.linux-mandrake.com/ +// http://www.mandrakesoft.com/ +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +// eth_tuntap.cc - TUN/TAP interface by Renzo Davoli <renzo@cs.unibo.it> +// +// WARNING: These instructions were written for ethertap, not TUN/TAP. +// +// Here's how to get this working. On the host machine: +// $ su root +// # /sbin/insmod ethertap +// Using /lib/modules/2.2.14-5.0/net/ethertap.o +// # mknod /dev/tap0 c 36 16 # if not already there +// # /sbin/ifconfig tap0 10.0.0.1 +// # /sbin/route add -host 10.0.0.2 gw 10.0.0.1 +// +// Now you have a tap0 device which you can on the ifconfig output. The +// tap0 interface has the IP address of 10.0.0.1. The bochs machine will have +// the IP address 10.0.0.2. +// +// Compile a bochs version from March 8, 2002 or later with --enable-ne2000. +// Add this ne2k line to your .bochsrc to activate the tap device. +// ne2k: ioaddr=0x280, irq=9, mac=fe:fd:00:00:00:01, ethmod=tap, ethdev=tap0 +// Don't change the mac or ethmod! +// +// Boot up DLX Linux in Bochs. Log in as root and then type the following +// commands to set up networking: +// # ifconfig eth0 10.0.0.2 +// # route add -net 10.0.0.0 +// # route add default gw 10.0.0.1 +// Now you should be able to ping from guest OS to your host machine, if +// you give its IP number. I'm still having trouble with pings from the +// host machine to the guest, so something is still not right. Symptoms: I +// ping from the host to the guest's IP address 10.0.0.2. With tcpdump I can +// see the ping going to Bochs, and then the ping reply coming from Bochs. +// But the ping program itself does not see the responses....well every +// once in a while it does, like 1 in 60 pings. +// +// host$ ping 10.0.0.2 +// PING 10.0.0.2 (10.0.0.2) from 10.0.0.1 : 56(84) bytes of data. +// +// Netstat output: +// 20:29:59.018776 fe:fd:0:0:0:0 fe:fd:0:0:0:1 0800 98: 10.0.0.1 > 10.0.0.2: icmp: echo request +// 4500 0054 2800 0000 4001 3ea7 0a00 0001 +// 0a00 0002 0800 09d3 a53e 0400 9765 893c +// 3949 0000 0809 0a0b 0c0d 0e0f 1011 1213 +// 1415 1617 1819 +// 20:29:59.023017 fe:fd:0:0:0:1 fe:fd:0:0:0:0 0800 98: 10.0.0.2 > 10.0.0.1: icmp: echo reply +// 4500 0054 004a 0000 4001 665d 0a00 0002 +// 0a00 0001 0000 11d3 a53e 0400 9765 893c +// 3949 0000 0809 0a0b 0c0d 0e0f 1011 1213 +// 1415 1617 1819 +// +// I suspect it may be related to the fact that ping 10.0.0.1 from the +// host also doesn't work. Why wouldn't the host respond to its own IP +// address on the tap0 device? +// +// Theoretically, if you set up packet forwarding (with masquerading) on the +// host, you should be able to get Bochs talking to anyone on the internet. +// + +// Define BX_PLUGGABLE in files that can be compiled into plugins. For +// platforms that require a special tag on exported symbols, BX_PLUGGABLE +// is used to know when we are exporting symbols and when we are importing. +#define BX_PLUGGABLE + +#include "bochs.h" +#if BX_NE2K_SUPPORT + +#define LOG_THIS bx_devices.pluginNE2kDevice-> + +#include <signal.h> +#include <sys/param.h> +#include <sys/ioctl.h> +#include <sys/poll.h> +#include <sys/time.h> +#include <sys/resource.h> +#include <asm/types.h> +#include <sys/socket.h> +#include <sys/uio.h> +#include <sys/wait.h> +#include <linux/netlink.h> +#include <linux/if.h> +#include <linux/if_tun.h> +#include <assert.h> +#include <fcntl.h> +#include <errno.h> + +#define TUNTAP_VIRTUAL_HW_ADDR 0xDEADBEEF +#define BX_ETH_TUNTAP_LOGGING 0 +#define BX_PACKET_BUFSIZ 2048 // Enough for an ether frame + +int tun_alloc(char *dev); + +// +// Define the class. This is private to this module +// +class bx_tuntap_pktmover_c : public eth_pktmover_c { +public: + bx_tuntap_pktmover_c(const char *netif, const char *macaddr, + eth_rx_handler_t rxh, + void *rxarg); + void sendpkt(void *buf, unsigned io_len); +private: + int fd; + int rx_timer_index; + static void rx_timer_handler(void *); + void rx_timer (); + FILE *txlog, *txlog_txt, *rxlog, *rxlog_txt; +}; + + +// +// Define the static class that registers the derived pktmover class, +// and allocates one on request. +// +class bx_tuntap_locator_c : public eth_locator_c { +public: + bx_tuntap_locator_c(void) : eth_locator_c("tuntap") {} +protected: + eth_pktmover_c *allocate(const char *netif, const char *macaddr, + eth_rx_handler_t rxh, + void *rxarg) { + return (new bx_tuntap_pktmover_c(netif, macaddr, rxh, rxarg)); + } +} bx_tuntap_match; + + +// +// Define the methods for the bx_tuntap_pktmover derived class +// + +// the constructor +bx_tuntap_pktmover_c::bx_tuntap_pktmover_c(const char *netif, + const char *macaddr, + eth_rx_handler_t rxh, + void *rxarg) +{ + int flags; + if (strncmp (netif, "tun", 3) != 0) { + BX_PANIC (("eth_tuntap: interface name (%s) must be tun", netif)); + } +#ifdef NEVERDEF + char filename[BX_PATHNAME_LEN]; + sprintf (filename, "/dev/net/%s", netif); + + // check if the TUN/TAP devices is running, and turn on ARP. This is based + // on code from the Mac-On-Linux project. http://http://www.maconlinux.org/ + int sock = socket( AF_INET, SOCK_DGRAM, 0 ); + if (sock < 0) { + BX_PANIC (("socket creation: %s", strerror(errno))); + return; + } + struct ifreq ifr; + memset( &ifr, 0, sizeof(ifr) ); + strncpy( ifr.ifr_name, netif, sizeof(ifr.ifr_name) ); + if( ioctl( sock, SIOCGIFFLAGS, &ifr ) < 0 ){ + BX_PANIC (("SIOCGIFFLAGS on %s: %s", netif, strerror (errno))); + close(sock); + return; + } + if( !(ifr.ifr_flags & IFF_RUNNING ) ){ + BX_PANIC (("%s device is not running", netif)); + close(sock); + return; + } + if( (ifr.ifr_flags & IFF_NOARP ) ){ + BX_INFO (("turn on ARP for %s device", netif)); + ifr.ifr_flags &= ~IFF_NOARP; + if( ioctl( sock, SIOCSIFFLAGS, &ifr ) < 0 ) { + BX_PANIC (("SIOCSIFFLAGS: %s", strerror(errno))); + close(sock); + return; + } + } + close(sock); + + fd = open (filename, O_RDWR); +#endif + char intname[IFNAMSIZ]; + strcpy(intname,netif); + fd=tun_alloc(intname); + if (fd < 0) { + BX_PANIC (("open failed on %s: %s", netif, strerror (errno))); + return; + } + + /* set O_ASYNC flag so that we can poll with read() */ + if ((flags = fcntl( fd, F_GETFL)) < 0) { + BX_PANIC (("getflags on tun device: %s", strerror (errno))); + } + flags |= O_NONBLOCK; + if (fcntl( fd, F_SETFL, flags ) < 0) { + BX_PANIC (("set tun device flags: %s", strerror (errno))); + } + + BX_INFO (("eth_tuntap: opened %s device", netif)); + + /* Execute the configuration script */ + char *scriptname=bx_options.ne2k.Oscript->getptr(); + if((scriptname != NULL) + &&(strcmp(scriptname, "") != 0) + &&(strcmp(scriptname, "none") != 0)) { + if (execute_script(scriptname, intname) < 0) + BX_ERROR (("execute script '%s' on %s failed", scriptname, intname)); + } + + // Start the rx poll + this->rx_timer_index = + bx_pc_system.register_timer(this, this->rx_timer_handler, 1000, + 1, 1, "eth_tuntap"); // continuous, active + this->rxh = rxh; + this->rxarg = rxarg; +#if BX_ETH_TUNTAP_LOGGING + // eventually Bryce wants txlog to dump in pcap format so that + // tcpdump -r FILE can read it and interpret packets. + txlog = fopen ("ne2k-tx.log", "wb"); + if (!txlog) BX_PANIC (("open ne2k-tx.log failed")); + txlog_txt = fopen ("ne2k-txdump.txt", "wb"); + if (!txlog_txt) BX_PANIC (("open ne2k-txdump.txt failed")); + fprintf (txlog_txt, "tuntap packetmover readable log file\n"); + fprintf (txlog_txt, "net IF = %s\n", netif); + fprintf (txlog_txt, "MAC address = "); + for (int i=0; i<6; i++) + fprintf (txlog_txt, "%02x%s", 0xff & macaddr[i], i<5?":" : ""); + fprintf (txlog_txt, "\n--\n"); + fflush (txlog_txt); + + rxlog = fopen ("ne2k-rx.log", "wb"); + if (!rxlog) BX_PANIC (("open ne2k-rx.log failed")); + rxlog_txt = fopen ("ne2k-rxdump.txt", "wb"); + if (!rxlog_txt) BX_PANIC (("open ne2k-rxdump.txt failed")); + fprintf (rxlog_txt, "tuntap packetmover readable log file\n"); + fprintf (rxlog_txt, "net IF = %s\n", netif); + fprintf (rxlog_txt, "MAC address = "); + for (int i=0; i<6; i++) + fprintf (rxlog_txt, "%02x%s", 0xff & macaddr[i], i<5?":" : ""); + fprintf (rxlog_txt, "\n--\n"); + fflush (rxlog_txt); + +#endif +} + +void +bx_tuntap_pktmover_c::sendpkt(void *buf, unsigned io_len) +{ +#ifdef NEVERDEF + Bit8u txbuf[BX_PACKET_BUFSIZ]; + txbuf[0] = 0; + txbuf[1] = 0; + memcpy (txbuf+2, buf, io_len); + unsigned int size = write (fd, txbuf, io_len+2); + if (size != io_len+2) { + BX_PANIC (("write on tuntap device: %s", strerror (errno))); + } else { + BX_INFO (("wrote %d bytes + 2 byte pad on tuntap", io_len)); + } +#endif + unsigned int size = write (fd, buf, io_len); + if (size != io_len) { + BX_PANIC (("write on tuntap device: %s", strerror (errno))); + } else { + BX_INFO (("wrote %d bytes on tuntap", io_len)); + } +#if BX_ETH_TUNTAP_LOGGING + BX_DEBUG (("sendpkt length %u", io_len)); + // dump raw bytes to a file, eventually dump in pcap format so that + // tcpdump -r FILE can interpret them for us. + int n = fwrite (buf, io_len, 1, txlog); + if (n != 1) BX_ERROR (("fwrite to txlog failed", io_len)); + // dump packet in hex into an ascii log file + fprintf (txlog_txt, "NE2K transmitting a packet, length %u\n", io_len); + Bit8u *charbuf = (Bit8u *)buf; + for (n=0; n<io_len; n++) { + if (((n % 16) == 0) && n>0) + fprintf (txlog_txt, "\n"); + fprintf (txlog_txt, "%02x ", charbuf[n]); + } + fprintf (txlog_txt, "\n--\n"); + // flush log so that we see the packets as they arrive w/o buffering + fflush (txlog); + fflush (txlog_txt); +#endif +} + +void bx_tuntap_pktmover_c::rx_timer_handler (void *this_ptr) +{ + bx_tuntap_pktmover_c *class_ptr = (bx_tuntap_pktmover_c *) this_ptr; + class_ptr->rx_timer(); +} + +void bx_tuntap_pktmover_c::rx_timer () +{ + int nbytes; + Bit8u buf[BX_PACKET_BUFSIZ]; + Bit8u *rxbuf; + if (fd<0) return; + nbytes = read (fd, buf, sizeof(buf)); + +#ifdef NEVERDEF + // hack: discard first two bytes + rxbuf = buf+2; + nbytes-=2; +#else + rxbuf=buf; +#endif + + // hack: TUN/TAP device likes to create an ethernet header which has + // the same source and destination address FE:FD:00:00:00:00. + // Change the dest address to FE:FD:00:00:00:01. + rxbuf[5] = 1; + + if (nbytes>0) + BX_INFO (("tuntap read returned %d bytes", nbytes)); + if (nbytes<0) { + if (errno != EAGAIN) + BX_ERROR (("tuntap read error: %s", strerror(errno))); + return; + } +#if BX_ETH_TUNTAP_LOGGING + if (nbytes > 0) { + BX_DEBUG (("receive packet length %u", nbytes)); + // dump raw bytes to a file, eventually dump in pcap format so that + // tcpdump -r FILE can interpret them for us. + int n = fwrite (rxbuf, nbytes, 1, rxlog); + if (n != 1) BX_ERROR (("fwrite to rxlog failed", nbytes)); + // dump packet in hex into an ascii log file + fprintf (rxlog_txt, "NE2K received a packet, length %u\n", nbytes); + for (n=0; n<nbytes; n++) { + if (((n % 16) == 0) && n>0) + fprintf (rxlog_txt, "\n"); + fprintf (rxlog_txt, "%02x ", rxbuf[n]); + } + fprintf (rxlog_txt, "\n--\n"); + // flush log so that we see the packets as they arrive w/o buffering + fflush (rxlog); + fflush (rxlog_txt); + } +#endif + BX_DEBUG(("eth_tuntap: got packet: %d bytes, dst=%x:%x:%x:%x:%x:%x, src=%x:%x:%x:%x:%x:%x\n", nbytes, rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3], rxbuf[4], rxbuf[5], rxbuf[6], rxbuf[7], rxbuf[8], rxbuf[9], rxbuf[10], rxbuf[11])); + if (nbytes < 60) { + BX_INFO (("packet too short (%d), padding to 60", nbytes)); + nbytes = 60; + } + (*rxh)(rxarg, rxbuf, nbytes); +} + + + int tun_alloc(char *dev) + { + struct ifreq ifr; + int fd, err; + + if( (fd = open("/dev/net/tun", O_RDWR)) < 0 ) + return -1; + + memset(&ifr, 0, sizeof(ifr)); + + /* Flags: IFF_TUN - TUN device (no Ethernet headers) + * IFF_TAP - TAP device + * + * IFF_NO_PI - Do not provide packet information + */ + ifr.ifr_flags = IFF_TAP | IFF_NO_PI; + if( *dev ) + strncpy(ifr.ifr_name, dev, IFNAMSIZ); + + if( (err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ){ + close(fd); + return err; + } + + //strcpy(dev, ifr.ifr_name); + ioctl( fd, TUNSETNOCSUM, 1 ); + + return fd; + } + +#endif /* if BX_NE2K_SUPPORT */ |