From 612a155e18e277096e3545b8054054f8c3f06c8a Mon Sep 17 00:00:00 2001 From: Bryce Denney Date: Sat, 9 Mar 2002 00:38:53 +0000 Subject: [PATCH] - add ethertap interface for Linux --- bochs/iodev/eth.cc | 11 +- bochs/iodev/eth_tap.cc | 257 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 267 insertions(+), 1 deletion(-) create mode 100644 bochs/iodev/eth_tap.cc diff --git a/bochs/iodev/eth.cc b/bochs/iodev/eth.cc index 3b48218d1..4e1187fa9 100644 --- a/bochs/iodev/eth.cc +++ b/bochs/iodev/eth.cc @@ -1,5 +1,5 @@ ///////////////////////////////////////////////////////////////////////// -// $Id: eth.cc,v 1.8 2001-10-03 13:10:38 bdenney Exp $ +// $Id: eth.cc,v 1.9 2002-03-09 00:38:53 bdenney Exp $ ///////////////////////////////////////////////////////////////////////// // // Copyright (C) 2001 MandrakeSoft S.A. @@ -57,6 +57,9 @@ extern class bx_linux_locator_c bx_linux_match; #ifdef ETH_WIN32 extern class bx_win32_locator_c bx_win32_match; #endif +#ifdef ETH_TAP +extern class bx_tap_locator_c bx_tap_match; +#endif #ifdef ETH_TEST extern bx_test_match; #endif @@ -105,6 +108,12 @@ eth_locator_c::create(const char *type, const char *netif, ptr = (eth_locator_c *) &bx_linux_match; } #endif +#ifdef ETH_TAP + { + if (!strcmp(type, "tap")) + ptr = (eth_locator_c *) &bx_tap_match; + } +#endif #ifdef ETH_WIN32 { if(!strcmp(type, "win32")) diff --git a/bochs/iodev/eth_tap.cc b/bochs/iodev/eth_tap.cc new file mode 100644 index 000000000..6ef76f457 --- /dev/null +++ b/bochs/iodev/eth_tap.cc @@ -0,0 +1,257 @@ +///////////////////////////////////////////////////////////////////////// +// $Id: eth_tap.cc,v 1.1 2002-03-09 00:38:53 bdenney 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_tap.cc - TAP interface +// +// Example configuration: +// ifconfig tap0 10.0.0.123 up +// route add -host 10.0.0.124 gw 10.0.0.123 +// Testing: +// in one window, cat /dev/tap0 +// in another window, ping 10.0.0.124 +// you should see data coming out of /dev/tap0 with each ping. + +#include "bochs.h" +#define LOG_THIS bx_ne2k. + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define TAP_VIRTUAL_HW_ADDR 0xDEADBEEF +#define BX_ETH_TAP_LOGGING 1 +#define BX_PACKET_BUFSIZ 2048 // Enough for an ether frame + +extern int check_netdev( char *ifname ); +extern int tap_open( const char *intf_name); + +// +// Define the class. This is private to this module +// +class bx_tap_pktmover_c : public eth_pktmover_c { +public: + bx_tap_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_tap_locator_c : public eth_locator_c { +public: + bx_tap_locator_c(void) : eth_locator_c("tap") {} +protected: + eth_pktmover_c *allocate(const char *netif, const char *macaddr, + eth_rx_handler_t rxh, + void *rxarg) { + return (new bx_tap_pktmover_c(netif, macaddr, rxh, rxarg)); + } +} bx_tap_match; + + +// +// Define the methods for the bx_tap_pktmover derived class +// + +// the constructor +bx_tap_pktmover_c::bx_tap_pktmover_c(const char *netif, + const char *macaddr, + eth_rx_handler_t rxh, + void *rxarg) +{ + int flags; + fd = tap_open (netif); + if (fd < 0) { + BX_PANIC (("tap_open failed on %s", netif)); + return; + } + +/* setup O_ASYNC, O_NONBLOCK */ +if( (flags = fcntl( fd, F_GETFL)) == -1 ) { + BX_PANIC (("getflags on tap device failed")); +} +flags |= O_NONBLOCK; +if( fcntl( fd, F_SETFL, flags ) == -1 ) { + BX_PANIC (("could not set tap device flags")); +} + +BX_INFO (("eth_tap: opened %s device", netif)); + +#if BX_ETH_TAP_LOGGING + // Start the rx poll + this->rx_timer_index = + bx_pc_system.register_timer(this, this->rx_timer_handler, 1000, + 1, 1); // continuous, active + this->rxh = rxh; + this->rxarg = rxarg; + // 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, "tap 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, "tap 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_tap_pktmover_c::sendpkt(void *buf, unsigned io_len) +{ + 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) { + perror("write"); + BX_PANIC (("write on tap device failed")); + } else { + BX_INFO (("wrote %d bytes + 2 byte pad on tap", io_len)); + } +#if BX_ETH_TAP_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; n0) + 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_tap_pktmover_c::rx_timer_handler (void *this_ptr) +{ + bx_tap_pktmover_c *class_ptr = (bx_tap_pktmover_c *) this_ptr; + class_ptr->rx_timer(); +} + +void bx_tap_pktmover_c::rx_timer () +{ + int nbytes; + Bit8u buf[BX_PACKET_BUFSIZ]; + Bit8u *rxbuf; + if (fd<0) return; + nbytes = read (fd, buf, sizeof(buf)); + + // hack: discard first two bytes + rxbuf = buf+2; + nbytes-=2; + + // hack: 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 (("tap read returned %d bytes", nbytes)); + if (nbytes<0) { + if (errno != EAGAIN) + BX_ERROR (("tap read error: %s", strerror(errno))); + return; + } +#if BX_ETH_TAP_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; n0) + 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_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])); + if (nbytes < 60) { + BX_INFO (("packet too short (%d), padding to 60", nbytes)); + nbytes = 60; + } + (*rxh)(rxarg, rxbuf, nbytes); +} + + +// still some dependence on GPL code from Mac-On-Linux. +// I will rewrite these functions from scratch. +#include "eth_tap_gpl.cc"