Bochs/bochs/iodev/network/eth_fbsd.cc

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001-2011 The Bochs Project
//
// 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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//
// Peter Grehan (grehan@iprg.nokia.com) coded all of this
// NE2000/ether stuff.
// eth_fbsd.cc - A FreeBSD packet filter implementation of
// an ethernet pktmover. There are some problems and limitations
// with FreeBSD:
// - the source address of the frame is overwritten by
// the hosts's source address. This causes problems with
// learning bridges - since they cannot determine where
// BOCHS 'is', they broadcast the frame to all ports.
// - packets cannot be sent from BOCHS to the host
// - TCP performance seems to be abysmal; I think this is
// a timing problem somewhere.
// - I haven't handled the case where multiple frames arrive
// in a single BPF read.
//
// The /dev/bpf* devices need to be set up with the appropriate
// permissions for this to work.
//
// The config line in .bochsrc should look something like:
//
// ne2k: ioaddr=0x280, irq=9, mac=00:a:b:c:1:2, ethmod=fbsd, ethdev=fxp0
//
// 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 "iodev.h"
#include "netmod.h"
#if BX_NETWORKING && BX_NETMOD_FBSD
- apply patch.ifdef-disabled-options. Comments from that patch are below: For a whole lot of configure options, I put #if...#endif around code that is specific to the option, even in files which are normally only compiled when the option is on. This allows me to create a MS Visual C++ 6.0 workspace that supports many of these options. The workspace will basically compile every file all the time, but the code for disabled options will be commented out by the #if...#endif. This may one day lead to simplification of the Makefiles and configure scripts, but for the moment I'm leaving Makefiles and configure scripts alone. Affected options: BX_SUPPORT_APIC (cpu/apic.cc) BX_SUPPORT_X86_64 (cpu/*64.cc) BX_DEBUGGER (debug/*) BX_DISASM (disasm/*) BX_WITH_nameofgui (gui/*) BX_SUPPORT_CDROM (iodev/cdrom.cc) BX_NE2K_SUPPORT (iodev/eth*.cc, iodev/ne2k.cc) BX_SUPPORT_APIC (iodev/ioapic.cc) BX_IODEBUG_SUPPORT (iodev/iodebug.cc) BX_PCI_SUPPORT (iodev/pci*.cc) BX_SUPPORT_SB16 (iodev/sb*.cc) Modified Files: cpu/apic.cc cpu/arith64.cc cpu/ctrl_xfer64.cc cpu/data_xfer64.cc cpu/fetchdecode64.cc cpu/logical64.cc cpu/mult64.cc cpu/resolve64.cc cpu/shift64.cc cpu/stack64.cc debug/Makefile.in debug/crc.cc debug/dbg_main.cc debug/lexer.l debug/linux.cc debug/parser.c debug/parser.y disasm/dis_decode.cc disasm/dis_groups.cc gui/amigaos.cc gui/beos.cc gui/carbon.cc gui/macintosh.cc gui/rfb.cc gui/sdl.cc gui/term.cc gui/win32.cc gui/wx.cc gui/wxdialog.cc gui/wxmain.cc gui/x.cc iodev/cdrom.cc iodev/eth.cc iodev/eth_arpback.cc iodev/eth_fbsd.cc iodev/eth_linux.cc iodev/eth_null.cc iodev/eth_packetmaker.cc iodev/eth_tap.cc iodev/eth_tuntap.cc iodev/eth_win32.cc iodev/ioapic.cc iodev/iodebug.cc iodev/ne2k.cc iodev/pci.cc iodev/pci2isa.cc iodev/sb16.cc iodev/soundlnx.cc iodev/soundwin.cc
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#define LOG_THIS netdev->
#define BX_ETH_FBSD_LOGGING 0
extern "C" {
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/bpf.h>
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#include <errno.h>
};
#define BX_BPF_POLL 1000 // Poll for a frame every 250 usecs
#define BX_BPF_INSNSIZ 8 // number of bpf insns
// template filter for a unicast mac address and all
// multicast/broadcast frames
static const struct bpf_insn macfilter[] = {
BPF_STMT(BPF_LD|BPF_W|BPF_ABS, 2), // A <- P[2:4]
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0xaaaaaaaa, 0, 2), // if A != 0xaaaaaaa GOTO LABEL-1
BPF_STMT(BPF_LD|BPF_H|BPF_ABS, 0), // A <- P[0:2]
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0000aaaa, 2, 0), // if A == 0xaaaa GOTO ACCEPT
// LABEL-1
BPF_STMT(BPF_LD|BPF_B|BPF_ABS, 0), // A <- P[0:1]
BPF_JUMP(BPF_JMP|BPF_JSET|BPF_K, 0x01, 0, 1), // if !(A & 1) GOTO LABEL-REJECT
// LABEL-ACCEPT
BPF_STMT(BPF_RET, 1514), // Accept packet
// LABEL-REJECT
BPF_STMT(BPF_RET, 0), // Reject packet
};
// template filter for all frames
static const struct bpf_insn promiscfilter[] = {
BPF_STMT(BPF_RET, 1514)
};
//
// Define the class. This is private to this module
//
class bx_fbsd_pktmover_c : public eth_pktmover_c {
public:
bx_fbsd_pktmover_c(const char *netif,
const char *macaddr,
eth_rx_handler_t rxh,
eth_rx_status_t rxstat,
bx_devmodel_c *dev, const char *script);
void sendpkt(void *buf, unsigned io_len);
private:
char *fbsd_macaddr[6];
int bpf_fd;
static void rx_timer_handler(void *);
void rx_timer(void);
int rx_timer_index;
struct bpf_insn filter[BX_BPF_INSNSIZ];
FILE *ne2klog, *ne2klog_txt;
};
//
// Define the static class that registers the derived pktmover class,
// and allocates one on request.
//
class bx_fbsd_locator_c : public eth_locator_c {
public:
bx_fbsd_locator_c(void) : eth_locator_c("fbsd") {}
protected:
eth_pktmover_c *allocate(const char *netif,
const char *macaddr,
eth_rx_handler_t rxh,
eth_rx_status_t rxstat,
bx_devmodel_c *dev, const char *script) {
return (new bx_fbsd_pktmover_c(netif, macaddr, rxh, rxstat, dev, script));
}
} bx_fbsd_match;
//
// Define the methods for the bx_fbsd_pktmover derived class
//
// the constructor
//
// Open a bpf file descriptor, and attempt to bind to
// the specified netif (Replicates libpcap open code)
//
bx_fbsd_pktmover_c::bx_fbsd_pktmover_c(const char *netif,
const char *macaddr,
eth_rx_handler_t rxh,
eth_rx_stat_t rxstat,
bx_devmodel_c *dev,
const char *script)
{
char device[sizeof "/dev/bpf000"];
int tmpfd;
int n = 0;
struct ifreq ifr;
struct bpf_version bv;
struct bpf_program bp;
u_int v;
this->netdev = dev;
BX_INFO(("freebsd network driver"));
memcpy(fbsd_macaddr, macaddr, 6);
do {
(void)sprintf(device, "/dev/bpf%d", n++);
this->bpf_fd = open(device, O_RDWR);
BX_DEBUG(("tried %s, returned %d (%s)",device,this->bpf_fd,strerror(errno)));
if(errno == EACCES)
break;
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} while (this->bpf_fd == -1);
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if (this->bpf_fd == -1) {
BX_PANIC(("eth_freebsd: could not open packet filter: %s", strerror(errno)));
return;
}
if (ioctl(this->bpf_fd, BIOCVERSION, (caddr_t)&bv) < 0) {
BX_PANIC(("eth_freebsd: could not retrieve bpf version"));
close(this->bpf_fd);
this->bpf_fd = -1;
return;
}
if (bv.bv_major != BPF_MAJOR_VERSION || bv.bv_minor < BPF_MINOR_VERSION) {
BX_PANIC(("eth_freebsd: bpf version mismatch between compilation and runtime"));
close(this->bpf_fd);
this->bpf_fd = -1;
return;
}
// Set buffer size
v = BX_PACKET_BUFSIZE;
if (ioctl(this->bpf_fd, BIOCSBLEN, (caddr_t)&v) < 0) {
BX_PANIC(("eth_freebsd: could not set buffer size: %s", strerror(errno)));
close(this->bpf_fd);
this->bpf_fd = -1;
return;
}
(void)strncpy(ifr.ifr_name, netif, sizeof(ifr.ifr_name));
if (ioctl(this->bpf_fd, BIOCSETIF, (caddr_t)&ifr) < 0) {
BX_PANIC(("eth_freebsd: could not enable interface '%s': %s", netif, strerror(errno)));
close(this->bpf_fd);
this->bpf_fd == -1;
}
// Verify that the device is an ethernet.
if (ioctl(this->bpf_fd, BIOCGDLT, (caddr_t)&v) < 0) {
BX_PANIC(("eth_freebsd: could not retrieve datalink type: %s", strerror(errno)));
close(this->bpf_fd);
this->bpf_fd = -1;
return;
}
if (v != DLT_EN10MB) {
BX_PANIC(("eth_freebsd: incorrect datalink type %d, expected 10mb ethernet", v));
close(this->bpf_fd);
this->bpf_fd = -1;
return;
}
// Put the device into promisc mode. This could be optimised
// to filter on a MAC address, broadcast, and all-multi,
// but this will do for now.
//
if (ioctl(this->bpf_fd, BIOCPROMISC, NULL) < 0) {
BX_PANIC(("eth_freebsd: could not enable promisc mode: %s", strerror(errno)));
close(this->bpf_fd);
this->bpf_fd = -1;
return;
}
v = 1;
if (ioctl(this->bpf_fd, BIOCIMMEDIATE, &v) < 0) {
BX_PANIC(("eth_freebsd: could not enable immediate mode"));
close(this->bpf_fd);
this->bpf_fd = -1;
return;
}
// Set up non-blocking i/o
v = 1;
if (ioctl(this->bpf_fd, FIONBIO, &v) < 0) {
BX_PANIC(("eth_freebsd: could not enable non-blocking i/o: %s", strerror(errno)));
close(this->bpf_fd);
this->bpf_fd = -1;
return;
}
// Install a filter
#ifdef notdef
memcpy(&this->filter, promiscfilter, sizeof(promiscfilter));
bp.bf_len = 1;
#else
memcpy(&this->filter, macfilter, sizeof(macfilter));
this->filter[1].k =
(macaddr[2] & 0xff) << 24 |
(macaddr[3] & 0xff) << 16 |
(macaddr[4] & 0xff) << 8 |
(macaddr[5] & 0xff);
this->filter[3].k =
(macaddr[0] & 0xff) << 8 |
(macaddr[1] & 0xff);
bp.bf_len = 8;
#endif
bp.bf_insns = &this->filter[0];
if (ioctl(this->bpf_fd, BIOCSETF, &bp) < 0) {
BX_PANIC(("eth_freebsd: could not set filter: %s", strerror(errno)));
close(this->bpf_fd);
this->bpf_fd = -1;
return;
}
// Start the rx poll
this->rx_timer_index =
bx_pc_system.register_timer(this, this->rx_timer_handler, BX_BPF_POLL,
1, 1, "eth_fbsd"); // continuous, active
this->rxh = rxh;
this->rxstat = rxstat;
#if BX_ETH_FBSD_LOGGING
// eventually Bryce wants ne2klog to dump in pcap format so that
// tcpdump -r FILE can read it and interpret packets.
ne2klog = fopen("ne2k.raw", "wb");
if (!ne2klog) BX_PANIC(("open ne2k-tx.log failed"));
ne2klog_txt = fopen("ne2k.txt", "wb");
if (!ne2klog_txt) BX_PANIC(("open ne2k-txdump.txt failed"));
fprintf(ne2klog_txt, "null packetmover readable log file\n");
fprintf(ne2klog_txt, "net IF = %s\n", netif);
fprintf(ne2klog_txt, "MAC address = ");
for (int i=0; i<6; i++)
fprintf(ne2klog_txt, "%02x%s", 0xff & macaddr[i], i<5?":" : "");
fprintf(ne2klog_txt, "\n--\n");
fflush(ne2klog_txt);
#endif
}
// the output routine - called with pre-formatted ethernet frame.
void
bx_fbsd_pktmover_c::sendpkt(void *buf, unsigned io_len)
{
#if BX_ETH_FBSD_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, ne2klog);
if (n != 1) BX_ERROR(("fwrite to ne2klog failed", io_len));
// dump packet in hex into an ascii log file
write_pktlog_txt(ne2klog_txt, (const Bit8u *)buf, io_len, 0);
// flush log so that we see the packets as they arrive w/o buffering
fflush(ne2klog);
#endif
int status;
if (this->bpf_fd != -1)
status = write(this->bpf_fd, buf, io_len);
}
// The receive poll process
void
bx_fbsd_pktmover_c::rx_timer_handler(void *this_ptr)
{
bx_fbsd_pktmover_c *class_ptr = (bx_fbsd_pktmover_c *) this_ptr;
class_ptr->rx_timer();
}
void
bx_fbsd_pktmover_c::rx_timer(void)
{
int nbytes = 0;
unsigned char rxbuf[BX_PACKET_BUFSIZE];
struct bpf_hdr *bhdr;
struct bpf_stat bstat;
static struct bpf_stat previous_bstat;
int counter = 10;
#define phdr ((unsigned char*)bhdr)
bhdr = (struct bpf_hdr *) rxbuf;
nbytes = read(this->bpf_fd, rxbuf, sizeof(rxbuf));
while (phdr < (rxbuf + nbytes)) {
if (ioctl(this->bpf_fd, BIOCGSTATS, &bstat) < 0) {
BX_PANIC(("eth_freebsd: could not stat filter: %s", strerror(errno)));
}
if (bstat.bs_drop > previous_bstat.bs_drop) {
BX_INFO(("eth_freebsd: %d packets dropped by the kernel.",
bstat.bs_drop - previous_bstat.bs_drop));
}
previous_bstat = bstat;
if (bhdr->bh_caplen < 20 || bhdr->bh_caplen > 1514) {
BX_ERROR(("eth_freebsd: received too weird packet length: %d", bhdr->bh_caplen));
}
// filter out packets sourced from this node
if (memcmp(bhdr + bhdr->bh_hdrlen + 6, this->fbsd_macaddr, 6)) {
if (this->rxstat(this->netdev) & BX_NETDEV_RXREADY) {
this->rxh(this->netdev, phdr + bhdr->bh_hdrlen, bhdr->bh_caplen);
} else {
BX_ERROR(("device not ready to receive data"));
}
}
#if BX_ETH_FBSD_LOGGING
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.
if (1 != fwrite(bhdr, bhdr->bh_caplen, 1, ne2klog)) {
BX_PANIC(("fwrite to ne2klog failed: %s", strerror(errno)));
}
// dump packet in hex into an ascii log file
write_pktlog_txt(ne2klog_txt, rxbuf, bhdr->bh_caplen, 1);
// flush log so that we see the packets as they arrive w/o buffering
fflush (this->ne2klog);
#endif
// Advance bhdr and phdr pointers to next packet
bhdr = (struct bpf_hdr*) ((char*) bhdr + BPF_WORDALIGN(bhdr->bh_hdrlen + bhdr->bh_caplen));
}
}
- apply patch.ifdef-disabled-options. Comments from that patch are below: For a whole lot of configure options, I put #if...#endif around code that is specific to the option, even in files which are normally only compiled when the option is on. This allows me to create a MS Visual C++ 6.0 workspace that supports many of these options. The workspace will basically compile every file all the time, but the code for disabled options will be commented out by the #if...#endif. This may one day lead to simplification of the Makefiles and configure scripts, but for the moment I'm leaving Makefiles and configure scripts alone. Affected options: BX_SUPPORT_APIC (cpu/apic.cc) BX_SUPPORT_X86_64 (cpu/*64.cc) BX_DEBUGGER (debug/*) BX_DISASM (disasm/*) BX_WITH_nameofgui (gui/*) BX_SUPPORT_CDROM (iodev/cdrom.cc) BX_NE2K_SUPPORT (iodev/eth*.cc, iodev/ne2k.cc) BX_SUPPORT_APIC (iodev/ioapic.cc) BX_IODEBUG_SUPPORT (iodev/iodebug.cc) BX_PCI_SUPPORT (iodev/pci*.cc) BX_SUPPORT_SB16 (iodev/sb*.cc) Modified Files: cpu/apic.cc cpu/arith64.cc cpu/ctrl_xfer64.cc cpu/data_xfer64.cc cpu/fetchdecode64.cc cpu/logical64.cc cpu/mult64.cc cpu/resolve64.cc cpu/shift64.cc cpu/stack64.cc debug/Makefile.in debug/crc.cc debug/dbg_main.cc debug/lexer.l debug/linux.cc debug/parser.c debug/parser.y disasm/dis_decode.cc disasm/dis_groups.cc gui/amigaos.cc gui/beos.cc gui/carbon.cc gui/macintosh.cc gui/rfb.cc gui/sdl.cc gui/term.cc gui/win32.cc gui/wx.cc gui/wxdialog.cc gui/wxmain.cc gui/x.cc iodev/cdrom.cc iodev/eth.cc iodev/eth_arpback.cc iodev/eth_fbsd.cc iodev/eth_linux.cc iodev/eth_null.cc iodev/eth_packetmaker.cc iodev/eth_tap.cc iodev/eth_tuntap.cc iodev/eth_win32.cc iodev/ioapic.cc iodev/iodebug.cc iodev/ne2k.cc iodev/pci.cc iodev/pci2isa.cc iodev/sb16.cc iodev/soundlnx.cc iodev/soundwin.cc
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#endif /* if BX_NETWORKING && BX_NETMOD_FBSD */