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a16a4a0886
Bochs/bochs/iodev/network/eth_vnet.cc
Volker Ruppert a16a4a0886 Some improvements for the vnet config file support. 
- Added options "net" for the IP address space and "ftp" for the FTP server.
- Added some sanity checks for the IP address configuration.
- Added sample config file.
2020-09-03 14:23:06 +00:00

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2004-2020 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
// virtual Ethernet locator
//
// An implementation of ARP, ping(ICMP-echo), DHCP and read/write FTP and TFTP.
// Virtual host acts as a DHCP server for guest.
// Limited DNS server for 'vnet' and the client only.
// There are no connections between the virtual host and real ethernets.
//
// Virtual host name: vnet
// Virtual net IP space: 192.168.10.0
// Virtual server IP: 192.168.10.1
// Virtual DNS server IP: 192.168.10.2
// Virtual FTP server IP: 192.168.10.3
// Guest IP: 192.168.10.15
// Guest netmask: 255.255.255.0
// Guest broadcast: 192.168.10.255
// FTP and TFTP server using the ethdev value for the root directory
// TFTP doesn't overwrite files
#define BX_PLUGGABLE
#include "iodev.h"
#include "netmod.h"
#include "netutil.h"
#if BX_NETWORKING
static unsigned int bx_vnet_instances = 0;
// network driver plugin entry points
int CDECL libvnet_net_plugin_init(plugin_t *plugin, plugintype_t type)
{
return 0; // Success
}
void CDECL libvnet_net_plugin_fini(void)
{
// Nothing here yet
}
// network driver implementation
#define LOG_THIS netdev->
#define BX_ETH_VNET_PCAP_LOGGING 0
#if BX_ETH_VNET_PCAP_LOGGING
#include <pcap.h>
#endif
/////////////////////////////////////////////////////////////////////////
// handler to send/receive packets
/////////////////////////////////////////////////////////////////////////
static const Bit8u default_net_ipv4addr[4] = {192,168,10,0};
static const Bit8u default_host_ipv4addr[4] = {192,168,10,1};
static const Bit8u default_dns_ipv4addr[4] = {192,168,10,2};
static const Bit8u default_ftp_ipv4addr[4] = {192,168,10,3};
static const Bit8u dhcp_base_ipv4addr[4] = {192,168,10,15};
static const char default_bootfile[] = "pxelinux.0";
static Bit8u packet_buffer[BX_PACKET_BUFSIZE];
static unsigned packet_len;
class bx_vnet_pktmover_c : public eth_pktmover_c {
public:
bx_vnet_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);
virtual ~bx_vnet_pktmover_c();
void sendpkt(void *buf, unsigned io_len);
private:
bx_bool parse_vnet_conf(const char *conf);
void guest_to_host(const Bit8u *buf, unsigned io_len);
void host_to_guest(void);
vnet_server_c vnet_server;
dhcp_cfg_t dhcp;
char *hostname;
static void rx_timer_handler(void *);
void rx_timer(void);
int rx_timer_index;
bx_bool rx_timer_pending;
unsigned netdev_speed;
unsigned tx_time;
bx_bool vnet_logging;
char *pktlog_fn;
FILE *pktlog_txt;
#if BX_ETH_VNET_PCAP_LOGGING
pcap_t *pcapp;
pcap_dumper_t *pktlog_pcap;
struct pcap_pkthdr pcaphdr;
#endif // BX_ETH_VNET_PCAP_LOGGING
};
class bx_vnet_locator_c : public eth_locator_c {
public:
bx_vnet_locator_c(void) : eth_locator_c("vnet") {}
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_vnet_pktmover_c(netif, macaddr, rxh, rxstat, dev, script));
}
} bx_vnet_match;
bx_bool get_ipv4_address(char *value, Bit8u *addr)
{
unsigned tmp[4];
if (sscanf(value, "%u.%u.%u.%u", &tmp[0], &tmp[1], &tmp[2], &tmp[3]) == 4) {
if ((tmp[0] < 256) && (tmp[1] < 256) && (tmp[2] < 256) && (tmp[3] < 256)) {
addr[0] = tmp[0];
addr[1] = tmp[1];
addr[2] = tmp[2];
addr[3] = tmp[3];
return 1;
}
}
return 0;
}
bx_bool bx_vnet_pktmover_c::parse_vnet_conf(const char *conf)
{
FILE *fd = NULL;
char line[512];
char *ret, *param, *val;
bx_bool format_checked = 0;
size_t len1 = 0, len2;
Bit8u tmp_ipv4addr[4];
fd = fopen(conf, "r");
if (fd == NULL) return 0;
do {
ret = fgets(line, sizeof(line)-1, fd);
line[sizeof(line) - 1] = '\0';
size_t len = strlen(line);
if ((len>0) && (line[len-1] < ' '))
line[len-1] = '\0';
if ((ret != NULL) && (strlen(line) > 0)) {
if (!format_checked) {
if (!strncmp(line, "# vnet config", 14)) {
format_checked = 1;
} else {
BX_ERROR(("vnet config: wrong file format"));
fclose(fd);
return 0;
}
} else {
if (line[0] == '#') continue;
param = strtok(line, "=");
if (param != NULL) {
len1 = strip_whitespace(param);
val = strtok(NULL, "");
if (val == NULL) {
BX_ERROR(("vnet config: missing value for parameter '%s'", param));
continue;
}
} else {
continue;
}
len2 = strip_whitespace(val);
if ((len1 == 0) || (len2 == 0)) continue;
if (!stricmp(param, "hostname")) {
if (len2 < 33) {
hostname = (char*)malloc(len2+1);
strcpy(hostname, val);
} else {
BX_ERROR(("vnet: wrong format for 'hostname'"));
}
} else if (!stricmp(param, "bootfile")) {
if (len2 < 128) {
strcpy(dhcp.bootfile, val);
} else {
BX_ERROR(("vnet: wrong format for 'bootfile'"));
}
} else if (!stricmp(param, "net")) {
if (!get_ipv4_address(val, (Bit8u*)&dhcp.net_ipv4addr)) {
BX_ERROR(("vnet: wrong format for 'net'"));
}
if (dhcp.net_ipv4addr[3] != 0) {
BX_ERROR(("vnet: IP address space must be set to x.y.z.0"));
dhcp.net_ipv4addr[3] = 0;
}
} else if (!stricmp(param, "host")) {
if (!get_ipv4_address(val, (Bit8u*)tmp_ipv4addr)) {
BX_ERROR(("vnet: wrong format for 'host'"));
}
if (!memcmp(tmp_ipv4addr, dhcp.net_ipv4addr, 3)) {
memcpy(dhcp.srv_ipv4addr[VNET_SRV], tmp_ipv4addr, 4);
} else {
BX_ERROR(("vnet: wrong IP address space for 'host'"));
}
} else if (!stricmp(param, "dhcpstart")) {
if (!get_ipv4_address(val, (Bit8u*)tmp_ipv4addr)) {
BX_ERROR(("vnet: wrong format for 'dhcpstart'"));
}
if (!memcmp(tmp_ipv4addr, dhcp.net_ipv4addr, 3)) {
memcpy(dhcp.client_base_ipv4addr, tmp_ipv4addr, 4);
} else {
BX_ERROR(("vnet: wrong IP address space for 'dhcpstart'"));
}
} else if (!stricmp(param, "dns")) {
if (!get_ipv4_address(val, (Bit8u*)tmp_ipv4addr)) {
BX_ERROR(("vnet: wrong format for 'dns'"));
}
if (!memcmp(tmp_ipv4addr, dhcp.net_ipv4addr, 3)) {
memcpy(dhcp.srv_ipv4addr[VNET_DNS], tmp_ipv4addr, 4);
} else {
BX_ERROR(("vnet: wrong IP address space for 'dns'"));
}
} else if (!stricmp(param, "ftp")) {
if (!get_ipv4_address(val, (Bit8u*)tmp_ipv4addr)) {
BX_ERROR(("vnet: wrong format for 'ftp'"));
}
if (!memcmp(tmp_ipv4addr, dhcp.net_ipv4addr, 3)) {
memcpy(dhcp.srv_ipv4addr[VNET_MISC], tmp_ipv4addr, 4);
} else {
BX_ERROR(("vnet: wrong IP address space for 'ftp'"));
}
} else if (!stricmp(param, "pktlog")) {
if (len2 < BX_PATHNAME_LEN) {
pktlog_fn = (char*)malloc(len2+1);
strcpy(pktlog_fn, val);
} else {
BX_ERROR(("vnet: wrong format for 'pktlog'"));
}
} else {
BX_ERROR(("vnet: unknown option '%s'", line));
}
}
}
} while (!feof(fd));
fclose(fd);
return 1;
}
bx_vnet_pktmover_c::bx_vnet_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)
{
if (bx_vnet_instances > 0) {
BX_PANIC(("only one 'vnet' instance supported yet"));
}
this->netdev = dev;
this->rxh = rxh;
this->rxstat = rxstat;
memcpy(&dhcp.host_macaddr[0], macaddr, 6);
dhcp.host_macaddr[5] ^= 0x03;
memcpy(dhcp.net_ipv4addr, default_net_ipv4addr, 4);
memcpy(dhcp.srv_ipv4addr[VNET_SRV], default_host_ipv4addr, 4);
memcpy(dhcp.srv_ipv4addr[VNET_DNS], default_dns_ipv4addr, 4);
memcpy(dhcp.srv_ipv4addr[VNET_MISC], default_ftp_ipv4addr, 4);
memcpy(dhcp.client_base_ipv4addr, dhcp_base_ipv4addr, 4);
strcpy(dhcp.bootfile, default_bootfile);
hostname = NULL;
pktlog_fn = NULL;
if ((strlen(script) > 0) && (strcmp(script, "none"))) {
if (!parse_vnet_conf(script)) {
BX_ERROR(("reading vnet config failed"));
}
}
vnet_server.init(dev, &dhcp, netif);
vnet_server.init_client(0, (Bit8u*)macaddr, hostname);
Bit32u status = this->rxstat(this->netdev) & BX_NETDEV_SPEED;
this->netdev_speed = (status == BX_NETDEV_1GBIT) ? 1000 :
(status == BX_NETDEV_100MBIT) ? 100 : 10;
this->rx_timer_index =
DEV_register_timer(this, this->rx_timer_handler, 1000, 0, 0, "eth_vnet");
rx_timer_pending = 0;
BX_INFO(("'vnet' network driver initialized"));
bx_vnet_instances++;
if (pktlog_fn != NULL) {
pktlog_txt = fopen(pktlog_fn, "wb");
vnet_logging = (pktlog_txt != NULL);
} else {
vnet_logging = 0;
}
if (vnet_logging) {
fprintf(pktlog_txt, "vnet packetmover readable log file\n");
fprintf(pktlog_txt, "TFTP root = %s\n", netif);
fprintf(pktlog_txt, "host MAC address = ");
int i;
for (i=0; i<6; i++)
fprintf(pktlog_txt, "%02x%s", 0xff & dhcp.host_macaddr[i], i<5?":" : "\n");
fprintf(pktlog_txt, "guest MAC address = ");
for (i=0; i<6; i++)
fprintf(pktlog_txt, "%02x%s", 0xff & macaddr[i], i<5?":" : "\n");
fprintf(pktlog_txt, "--\n");
fflush(pktlog_txt);
}
#if BX_ETH_VNET_PCAP_LOGGING
pcapp = pcap_open_dead(DLT_EN10MB, BX_PACKET_BUFSIZE);
pktlog_pcap = pcap_dump_open(pcapp, "vnet-pktlog.pcap");
if (pktlog_pcap == NULL) BX_PANIC(("vnet-pktlog.pcap failed"));
#endif
}
bx_vnet_pktmover_c::~bx_vnet_pktmover_c()
{
if (vnet_logging) {
fclose(pktlog_txt);
}
bx_vnet_instances--;
}
void bx_vnet_pktmover_c::sendpkt(void *buf, unsigned io_len)
{
guest_to_host((const Bit8u *)buf,io_len);
}
void bx_vnet_pktmover_c::guest_to_host(const Bit8u *buf, unsigned io_len)
{
if (vnet_logging) {
write_pktlog_txt(pktlog_txt, buf, io_len, 0);
}
#if BX_ETH_VNET_PCAP_LOGGING
if (pktlog_pcap && !ferror((FILE *)pktlog_pcap)) {
Bit64u time = bx_pc_system.time_usec();
pcaphdr.ts.tv_usec = time % 1000000;
pcaphdr.ts.tv_sec = time / 1000000;
pcaphdr.caplen = io_len;
pcaphdr.len = io_len;
pcap_dump((u_char *)pktlog_pcap, &pcaphdr, buf);
fflush((FILE *)pktlog_pcap);
}
#endif
this->tx_time = (64 + 96 + 4 * 8 + io_len * 8) / this->netdev_speed;
vnet_server.handle_packet(buf, io_len);
host_to_guest();
}
void bx_vnet_pktmover_c::host_to_guest(void)
{
if (!rx_timer_pending) {
packet_len = vnet_server.get_packet(packet_buffer);
if (packet_len > 0) {
unsigned rx_time = (64 + 96 + 4 * 8 + packet_len * 8) / this->netdev_speed;
bx_pc_system.activate_timer(this->rx_timer_index, this->tx_time + rx_time + 100, 0);
rx_timer_pending = 1;
}
}
}
// The receive poll process
void bx_vnet_pktmover_c::rx_timer_handler(void *this_ptr)
{
bx_vnet_pktmover_c *class_ptr = (bx_vnet_pktmover_c *) this_ptr;
class_ptr->rx_timer();
}
void bx_vnet_pktmover_c::rx_timer(void)
{
if (this->rxstat(this->netdev) & BX_NETDEV_RXREADY) {
this->rxh(this->netdev, (void *)packet_buffer, packet_len);
if (vnet_logging) {
write_pktlog_txt(pktlog_txt, packet_buffer, packet_len, 1);
}
#if BX_ETH_VNET_PCAP_LOGGING
if (pktlog_pcap && !ferror((FILE *)pktlog_pcap)) {
Bit64u time = bx_pc_system.time_usec();
pcaphdr.ts.tv_usec = time % 1000000;
pcaphdr.ts.tv_sec = time / 1000000;
pcaphdr.caplen = packet_len;
pcaphdr.len = packet_len;
pcap_dump((u_char *)pktlog_pcap, &pcaphdr, packet_buffer);
fflush((FILE *)pktlog_pcap);
}
#endif
rx_timer_pending = 0;
// check for another pending packet
host_to_guest();
} else {
BX_ERROR(("device not ready to receive data"));
}
}
#endif /* if BX_NETWORKING */
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