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- add ethertap interface for Linux

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This commit is contained in:
Bryce Denney 2002-03-09 00:38:53 +00:00
parent c8d3a1ce24
commit 612a155e18
2 changed files with 267 additions and 1 deletions
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11
bochs/iodev/eth.cc
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@ -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"))

257
bochs/iodev/eth_tap.cc Normal file
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@ -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 <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 <assert.h>
#include <fcntl.h>
#include <errno.h>
#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; 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_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; 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_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"