2bbb1ef8eb
don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
285 lines
7.7 KiB
C++
285 lines
7.7 KiB
C++
// 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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// Peter Grehan (grehan@iprg.nokia.com) coded all of this
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// NE2000/ether stuff.
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// eth_fbsd.cc - A FreeBSD packet filter implementation of
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// an ethernet pktmover. There are some problems and limitations
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// with FreeBSD:
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// - the source address of the frame is overwritten by
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// the hosts's source address. This causes problems with
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// learning bridges - since they cannot determine where
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// BOCHS 'is', they broadcast the frame to all ports.
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// - packets cannot be sent from BOCHS to the host
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// - TCP performance seems to be abysmal; I think this is
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// a timing problem somewhere.
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// - I haven't handled the case where multiple frames arrive
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// in a single BPF read.
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//
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// The /dev/bpf* devices need to be set up with the appropriate
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// permissions for this to work.
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//
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// The config line in .bochsrc should look something like:
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//
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// ne2k: ioaddr=0x280, irq=9, mac=00:a:b:c:1:2, ethmod=fbsd, ethdev=fxp0
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//
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#include "bochs.h"
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#define LOG_THIS this->
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extern "C" {
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/bpf.h>
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};
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#define BX_BPF_POLL 1000 // Poll for a frame every 1000 usecs
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#define BX_BPF_BUFSIZ 2048 // enough for an ether frame + bpf hdr
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#define BX_BPF_INSNSIZ 8 // number of bpf insns
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// template filter for a unicast mac address and all
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// multicast/broadcast frames
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static const struct bpf_insn macfilter[] = {
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BPF_STMT(BPF_LD|BPF_W|BPF_ABS, 2),
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BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0xaaaaaaaa, 0, 2),
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BPF_STMT(BPF_LD|BPF_H|BPF_ABS, 0),
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BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0000aaaa, 2, 0),
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BPF_STMT(BPF_LD|BPF_B|BPF_ABS, 0),
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BPF_JUMP(BPF_JMP|BPF_JSET|BPF_K, 0x01, 0, 1),
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BPF_STMT(BPF_RET, 1514),
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BPF_STMT(BPF_RET, 0),
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};
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// template filter for all frames
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static const struct bpf_insn promiscfilter[] = {
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BPF_STMT(BPF_RET, 1514)
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};
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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_fbsd_pktmover_c : public eth_pktmover_c {
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public:
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bx_fbsd_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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void sendpkt(void *buf, unsigned io_len);
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private:
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char *fbsd_macaddr[6];
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int bpf_fd;
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static void rx_timer_handler(void *);
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void rx_timer(void);
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int rx_timer_index;
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struct bpf_insn filter[BX_BPF_INSNSIZ];
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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_fbsd_locator_c : public eth_locator_c {
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public:
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bx_fbsd_locator_c(void) : eth_locator_c("fbsd") {}
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protected:
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eth_pktmover_c *allocate(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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return (new bx_fbsd_pktmover_c(netif, macaddr, rxh, rxarg));
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}
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} bx_fbsd_match;
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//
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// Define the methods for the bx_fbsd_pktmover derived class
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//
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// the constructor
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//
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// Open a bpf file descriptor, and attempt to bind to
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// the specified netif (Replicates libpcap open code)
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//
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bx_fbsd_pktmover_c::bx_fbsd_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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char device[sizeof "/dev/bpf000"];
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int tmpfd;
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int n = 0;
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struct ifreq ifr;
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struct bpf_version bv;
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struct bpf_program bp;
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u_int v;
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memcpy(fbsd_macaddr, macaddr, 6);
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do {
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(void)sprintf(device, "/dev/bpf%d", n++);
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this->bpf_fd = open(device, O_RDWR);
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} while (this->bpf_fd < 0);
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if (this->bpf_fd < 0) {
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BX_INFO(("eth_freebsd: could not open packet filter"));
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return;
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}
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if (ioctl(this->bpf_fd, BIOCVERSION, (caddr_t)&bv) < 0) {
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BX_INFO(("eth_freebsd: could not retrieve bpf version"));
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close(this->bpf_fd);
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this->bpf_fd = -1;
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return;
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}
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if (bv.bv_major != BPF_MAJOR_VERSION ||
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bv.bv_minor < BPF_MINOR_VERSION) {
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BX_INFO(("eth_freebsd: bpf version mismatch"));
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close(this->bpf_fd);
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this->bpf_fd = -1;
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return;
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}
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// Set buffer size
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v = BX_BPF_BUFSIZ;
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if (ioctl(this->bpf_fd, BIOCSBLEN, (caddr_t)&v) < 0) {
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BX_INFO(("eth_freebsd: could not set buffer size"));
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close(this->bpf_fd);
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this->bpf_fd = -1;
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return;
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}
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(void)strncpy(ifr.ifr_name, netif, sizeof(ifr.ifr_name));
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if (ioctl(this->bpf_fd, BIOCSETIF, (caddr_t)&ifr) < 0) {
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BX_INFO(("eth_freebsd: could not enable interface %s", netif));
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close(this->bpf_fd);
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this->bpf_fd == -1;
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}
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// Verify that the device is an ethernet.
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if (ioctl(this->bpf_fd, BIOCGDLT, (caddr_t)&v) < 0) {
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BX_INFO(("eth_freebsd: could not retrieve datalink type"));
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close(this->bpf_fd);
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this->bpf_fd = -1;
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return;
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}
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if (v != DLT_EN10MB) {
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BX_INFO(("eth_freebsd: incorrect datalink type %d", v));
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close(this->bpf_fd);
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this->bpf_fd = -1;
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return;
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}
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// Put the device into promisc mode. This could be optimised
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// to filter on a MAC address, broadcast, and all-multi,
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// but this will do for now.
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//
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if (ioctl(this->bpf_fd, BIOCPROMISC, NULL) < 0) {
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BX_INFO(("eth_freebsd: could not enable promisc mode"));
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close(this->bpf_fd);
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this->bpf_fd = -1;
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return;
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}
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// Set up non-blocking i/o
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v = 1;
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if (ioctl(this->bpf_fd, FIONBIO, &v) < 0) {
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BX_INFO(("eth_freebsd: could not enable non-blocking i/o"));
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close(this->bpf_fd);
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this->bpf_fd = -1;
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return;
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}
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// Install a filter
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#ifdef notdef
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memcpy(&this->filter, promiscfilter, sizeof(promiscfilter));
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bp.bf_len = 1;
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#endif
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memcpy(&this->filter, macfilter, sizeof(macfilter));
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this->filter[1].k = (macaddr[2] & 0xff) << 24 |
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(macaddr[3] & 0xff) << 16 |
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(macaddr[4] & 0xff) << 8 |
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(macaddr[5] & 0xff);
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this->filter[3].k = (macaddr[0] & 0xff) << 8 |
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(macaddr[1] & 0xff);
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bp.bf_len = 8;
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bp.bf_insns = &this->filter[0];
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if (ioctl(this->bpf_fd, BIOCSETF, &bp) < 0) {
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BX_INFO(("eth_freebsd: could not set filter"));
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close(this->bpf_fd);
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this->bpf_fd = -1;
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return;
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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, BX_BPF_POLL,
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1, 1); // continuous, active
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this->rxh = rxh;
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this->rxarg = rxarg;
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}
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// the output routine - called with pre-formatted ethernet frame.
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void
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bx_fbsd_pktmover_c::sendpkt(void *buf, unsigned io_len)
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{
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int status;
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if (this->bpf_fd != -1)
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status = write(this->bpf_fd, buf, io_len);
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}
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// The receive poll process
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void
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bx_fbsd_pktmover_c::rx_timer_handler(void *this_ptr)
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{
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bx_fbsd_pktmover_c *class_ptr = (bx_fbsd_pktmover_c *) this_ptr;
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class_ptr->rx_timer();
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}
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void
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bx_fbsd_pktmover_c::rx_timer(void)
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{
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int nbytes = 0;
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Bit8u rxbuf[BX_BPF_BUFSIZ];
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struct bpf_hdr *bhdr;
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nbytes = read(this->bpf_fd, rxbuf, sizeof(rxbuf));
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if (nbytes > 0) {
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bhdr = (struct bpf_hdr *) rxbuf;
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// filter out packets sourced from this node
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if (memcmp(rxbuf + bhdr->bh_hdrlen + 6, this->fbsd_macaddr, 6)) {
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(*rxh)(rxarg, rxbuf + bhdr->bh_hdrlen, bhdr->bh_caplen);
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}
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}
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}
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