373 lines
12 KiB
C++
373 lines
12 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: eth_tap.cc,v 1.20 2004-09-11 15:39:52 vruppert Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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// eth_tap.cc - TAP interface by Bryce Denney
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//
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// Here's how to get this working. On the host machine:
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// $ su root
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// # /sbin/insmod ethertap
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// Using /lib/modules/2.2.14-5.0/net/ethertap.o
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// # mknod /dev/tap0 c 36 16 # if not already there
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// # /sbin/ifconfig tap0 10.0.0.1
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// # /sbin/route add -host 10.0.0.2 gw 10.0.0.1
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//
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// Now you have a tap0 device which you can on the ifconfig output. The
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// tap0 interface has the IP address of 10.0.0.1. The bochs machine will have
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// the IP address 10.0.0.2.
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//
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// Compile a bochs version from March 8, 2002 or later with --enable-ne2000.
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// Add this ne2k line to your .bochsrc to activate the tap device.
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// ne2k: ioaddr=0x280, irq=9, mac=fe:fd:00:00:00:01, ethmod=tap, ethdev=tap0
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// Don't change the mac or ethmod!
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//
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// Boot up DLX Linux in Bochs. Log in as root and then type the following
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// commands to set up networking:
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// # ifconfig eth0 10.0.0.2
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// # route add -net 10.0.0.0
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// # route add default gw 10.0.0.1
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// Now you should be able to ping from guest OS to your host machine, if
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// you give its IP number. I'm still having trouble with pings from the
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// host machine to the guest, so something is still not right. Symptoms: I
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// ping from the host to the guest's IP address 10.0.0.2. With tcpdump I can
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// see the ping going to Bochs, and then the ping reply coming from Bochs.
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// But the ping program itself does not see the responses....well every
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// once in a while it does, like 1 in 60 pings.
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//
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// host$ ping 10.0.0.2
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// PING 10.0.0.2 (10.0.0.2) from 10.0.0.1 : 56(84) bytes of data.
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//
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// Netstat output:
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// 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
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// 4500 0054 2800 0000 4001 3ea7 0a00 0001
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// 0a00 0002 0800 09d3 a53e 0400 9765 893c
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// 3949 0000 0809 0a0b 0c0d 0e0f 1011 1213
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// 1415 1617 1819
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// 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
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// 4500 0054 004a 0000 4001 665d 0a00 0002
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// 0a00 0001 0000 11d3 a53e 0400 9765 893c
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// 3949 0000 0809 0a0b 0c0d 0e0f 1011 1213
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// 1415 1617 1819
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//
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// I suspect it may be related to the fact that ping 10.0.0.1 from the
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// host also doesn't work. Why wouldn't the host respond to its own IP
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// address on the tap0 device?
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//
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// Theoretically, if you set up packet forwarding (with masquerading) on the
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// host, you should be able to get Bochs talking to anyone on the internet.
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//
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// Define BX_PLUGGABLE in files that can be compiled into plugins. For
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// platforms that require a special tag on exported symbols, BX_PLUGGABLE
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// is used to know when we are exporting symbols and when we are importing.
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#define BX_PLUGGABLE
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#include "iodev.h"
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#if BX_SUPPORT_NE2K
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#include "eth.h"
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#define LOG_THIS bx_devices.pluginNE2kDevice->
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#include <signal.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#ifndef __APPLE__
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#include <sys/poll.h>
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#endif
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <sys/wait.h>
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__) // Should be fixed for other *BSD
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#include <net/if.h>
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#elif defined(__linux__)
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#include <asm/types.h>
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#include <linux/netlink.h>
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#include <linux/if.h>
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#endif
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#include <assert.h>
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#include <fcntl.h>
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#include <errno.h>
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#define TAP_VIRTUAL_HW_ADDR 0xDEADBEEF
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#define BX_ETH_TAP_LOGGING 1
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#define BX_PACKET_BUFSIZ 2048 // Enough for an ether frame
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//
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// Define the class. This is private to this module
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//
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class bx_tap_pktmover_c : public eth_pktmover_c {
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public:
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bx_tap_pktmover_c(const char *netif, const char *macaddr,
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eth_rx_handler_t rxh,
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void *rxarg);
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void sendpkt(void *buf, unsigned io_len);
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private:
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int fd;
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int rx_timer_index;
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static void rx_timer_handler(void *);
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void rx_timer ();
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FILE *txlog, *txlog_txt, *rxlog, *rxlog_txt;
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};
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//
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// Define the static class that registers the derived pktmover class,
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// and allocates one on request.
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//
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class bx_tap_locator_c : public eth_locator_c {
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public:
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bx_tap_locator_c(void) : eth_locator_c("tap") {}
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protected:
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eth_pktmover_c *allocate(const char *netif, const char *macaddr,
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eth_rx_handler_t rxh,
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void *rxarg) {
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return (new bx_tap_pktmover_c(netif, macaddr, rxh, rxarg));
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}
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} bx_tap_match;
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//
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// Define the methods for the bx_tap_pktmover derived class
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//
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// the constructor
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bx_tap_pktmover_c::bx_tap_pktmover_c(const char *netif,
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const char *macaddr,
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eth_rx_handler_t rxh,
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void *rxarg)
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{
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int flags;
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char filename[BX_PATHNAME_LEN];
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if (strncmp (netif, "tap", 3) != 0) {
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BX_PANIC (("eth_tap: interface name (%s) must be tap0..tap15", netif));
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}
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sprintf (filename, "/dev/%s", netif);
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#if defined(__linux__)
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// check if the TAP devices is running, and turn on ARP. This is based
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// on code from the Mac-On-Linux project. http://http://www.maconlinux.org/
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int sock = socket( AF_INET, SOCK_DGRAM, 0 );
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if (sock < 0) {
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BX_PANIC (("socket creation: %s", strerror(errno)));
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return;
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}
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struct ifreq ifr;
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memset( &ifr, 0, sizeof(ifr) );
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strncpy( ifr.ifr_name, netif, sizeof(ifr.ifr_name) );
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if( ioctl( sock, SIOCGIFFLAGS, &ifr ) < 0 ){
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BX_PANIC (("SIOCGIFFLAGS on %s: %s", netif, strerror (errno)));
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close(sock);
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return;
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}
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if( !(ifr.ifr_flags & IFF_RUNNING ) ){
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BX_PANIC (("%s device is not running", netif));
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close(sock);
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return;
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}
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if( (ifr.ifr_flags & IFF_NOARP ) ){
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BX_INFO (("turn on ARP for %s device", netif));
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ifr.ifr_flags &= ~IFF_NOARP;
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if( ioctl( sock, SIOCSIFFLAGS, &ifr ) < 0 ) {
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BX_PANIC (("SIOCSIFFLAGS: %s", strerror(errno)));
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close(sock);
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return;
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}
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}
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close(sock);
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#endif
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fd = open (filename, O_RDWR);
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if (fd < 0) {
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BX_PANIC (("open failed on %s: %s", netif, strerror (errno)));
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return;
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}
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/* set O_ASYNC flag so that we can poll with read() */
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if ((flags = fcntl( fd, F_GETFL)) < 0) {
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BX_PANIC (("getflags on tap device: %s", strerror (errno)));
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}
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flags |= O_NONBLOCK;
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if (fcntl( fd, F_SETFL, flags ) < 0) {
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BX_PANIC (("set tap device flags: %s", strerror (errno)));
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}
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BX_INFO (("eth_tap: opened %s device", netif));
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/* Execute the configuration script */
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char intname[IFNAMSIZ];
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strcpy(intname,netif);
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char *scriptname=bx_options.ne2k.Oscript->getptr();
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if((scriptname != NULL)
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&&(strcmp(scriptname, "") != 0)
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&&(strcmp(scriptname, "none") != 0)) {
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if (execute_script(scriptname, intname) < 0)
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BX_ERROR (("execute script '%s' on %s failed", scriptname, intname));
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}
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// Start the rx poll
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this->rx_timer_index =
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bx_pc_system.register_timer(this, this->rx_timer_handler, 1000,
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1, 1, "eth_tap"); // continuous, active
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this->rxh = rxh;
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this->rxarg = rxarg;
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#if BX_ETH_TAP_LOGGING
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// eventually Bryce wants txlog to dump in pcap format so that
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// tcpdump -r FILE can read it and interpret packets.
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txlog = fopen ("ne2k-tx.log", "wb");
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if (!txlog) BX_PANIC (("open ne2k-tx.log failed"));
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txlog_txt = fopen ("ne2k-txdump.txt", "wb");
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if (!txlog_txt) BX_PANIC (("open ne2k-txdump.txt failed"));
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fprintf (txlog_txt, "tap packetmover readable log file\n");
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fprintf (txlog_txt, "net IF = %s\n", netif);
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fprintf (txlog_txt, "MAC address = ");
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for (int i=0; i<6; i++)
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fprintf (txlog_txt, "%02x%s", 0xff & macaddr[i], i<5?":" : "");
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fprintf (txlog_txt, "\n--\n");
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fflush (txlog_txt);
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rxlog = fopen ("ne2k-rx.log", "wb");
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if (!rxlog) BX_PANIC (("open ne2k-rx.log failed"));
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rxlog_txt = fopen ("ne2k-rxdump.txt", "wb");
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if (!rxlog_txt) BX_PANIC (("open ne2k-rxdump.txt failed"));
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fprintf (rxlog_txt, "tap packetmover readable log file\n");
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fprintf (rxlog_txt, "net IF = %s\n", netif);
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fprintf (rxlog_txt, "MAC address = ");
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for (int i=0; i<6; i++)
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fprintf (rxlog_txt, "%02x%s", 0xff & macaddr[i], i<5?":" : "");
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fprintf (rxlog_txt, "\n--\n");
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fflush (rxlog_txt);
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#endif
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}
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void
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bx_tap_pktmover_c::sendpkt(void *buf, unsigned io_len)
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{
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Bit8u txbuf[BX_PACKET_BUFSIZ];
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txbuf[0] = 0;
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txbuf[1] = 0;
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__) // Should be fixed for other *BSD
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memcpy (txbuf, buf, io_len);
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unsigned int size = write (fd, txbuf, io_len);
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if (size != io_len) {
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#else
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memcpy (txbuf+2, buf, io_len);
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unsigned int size = write (fd, txbuf, io_len+2);
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if (size != io_len+2) {
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#endif
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BX_PANIC (("write on tap device: %s", strerror (errno)));
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} else {
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BX_INFO (("wrote %d bytes + 2 byte pad on tap", io_len));
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}
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#if BX_ETH_TAP_LOGGING
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BX_DEBUG (("sendpkt length %u", io_len));
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// dump raw bytes to a file, eventually dump in pcap format so that
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// tcpdump -r FILE can interpret them for us.
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int n = fwrite (buf, io_len, 1, txlog);
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if (n != 1) BX_ERROR (("fwrite to txlog failed, io_len = %u", io_len));
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// dump packet in hex into an ascii log file
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fprintf (txlog_txt, "NE2K transmitting a packet, length %u\n", io_len);
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Bit8u *charbuf = (Bit8u *)buf;
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for (n=0; n<(int)io_len; n++) {
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if (((n % 16) == 0) && n>0)
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fprintf (txlog_txt, "\n");
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fprintf (txlog_txt, "%02x ", charbuf[n]);
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}
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fprintf (txlog_txt, "\n--\n");
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// flush log so that we see the packets as they arrive w/o buffering
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fflush (txlog);
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fflush (txlog_txt);
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#endif
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}
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void bx_tap_pktmover_c::rx_timer_handler (void *this_ptr)
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{
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bx_tap_pktmover_c *class_ptr = (bx_tap_pktmover_c *) this_ptr;
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class_ptr->rx_timer();
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}
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void bx_tap_pktmover_c::rx_timer ()
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{
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int nbytes;
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Bit8u buf[BX_PACKET_BUFSIZ];
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Bit8u *rxbuf;
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if (fd<0) return;
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nbytes = read (fd, buf, sizeof(buf));
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// hack: discard first two bytes
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__) // Should be fixed for other *BSD
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rxbuf = buf;
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#else
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rxbuf = buf+2;
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nbytes-=2;
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#endif
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// hack: TAP device likes to create an ethernet header which has
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// the same source and destination address FE:FD:00:00:00:00.
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// Change the dest address to FE:FD:00:00:00:01.
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#if defined(__linux__)
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rxbuf[5] = 1;
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#endif
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if (nbytes>0)
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BX_INFO (("tap read returned %d bytes", nbytes));
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if (nbytes<0) {
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if (errno != EAGAIN)
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BX_ERROR (("tap read error: %s", strerror(errno)));
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return;
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}
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#if BX_ETH_TAP_LOGGING
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if (nbytes > 0) {
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BX_DEBUG (("receive packet length %u", nbytes));
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// dump raw bytes to a file, eventually dump in pcap format so that
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// tcpdump -r FILE can interpret them for us.
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int n = fwrite (rxbuf, nbytes, 1, rxlog);
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if (n != 1) BX_ERROR (("fwrite to rxlog failed, nbytes = %d", nbytes));
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// dump packet in hex into an ascii log file
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fprintf (rxlog_txt, "NE2K received a packet, length %u\n", nbytes);
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for (n=0; n<nbytes; n++) {
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if (((n % 16) == 0) && n>0)
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fprintf (rxlog_txt, "\n");
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fprintf (rxlog_txt, "%02x ", rxbuf[n]);
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}
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fprintf (rxlog_txt, "\n--\n");
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// flush log so that we see the packets as they arrive w/o buffering
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fflush (rxlog);
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fflush (rxlog_txt);
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}
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#endif
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BX_DEBUG(("eth_tap: 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]));
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if (nbytes < 60) {
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BX_INFO (("packet too short (%d), padding to 60", nbytes));
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nbytes = 60;
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}
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(*rxh)(rxarg, rxbuf, nbytes);
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}
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#endif /* if BX_SUPPORT_NE2K */
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