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Bochs/bochs/iodev/eth_vnet.cc
Volker Ruppert c9af6d043d - all networking modules: check device receive status before sending packet 
- networking modules 'slirp' and 'vnet': use device speed for timing of
  emulated replies.
2011-12-18 09:12:38 +00:00

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 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
// virtual Ethernet locator
//
// An implementation of ARP, ping(ICMP-echo), DHCP and read/write TFTP.
// Virtual host acts as a DHCP server for guest.
// There are no connections between the virtual host and real ethernets.
//
// Virtual host name: vnet
// Virtual host IP: 192.168.10.1
// Guest IP: 192.168.10.2
// Guest netmask: 255.255.255.0
// Guest broadcast: 192.168.10.255
// TFTP server uses ethdev value for the root directory and doesn't overwrite files
#define BX_PLUGGABLE
#include "iodev.h"
#include "netmod.h"
#if BX_NETWORKING
#define LOG_THIS netdev->
#define BX_ETH_VNET_LOGGING 1
#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_host_ipv4addr[4] = {192,168,10,1};
static const Bit8u subnetmask_ipv4addr[4] = {0xff,0xff,0xff,0x00};
static const Bit8u default_guest_ipv4addr[4] = {192,168,10,2};
static const Bit8u broadcast_ipv4addr[3][4] =
{
{ 0, 0, 0, 0},
{255,255,255,255},
{192,168, 10,255},
};
#define ICMP_ECHO_PACKET_MAX 128
#define LAYER4_LISTEN_MAX 128
static Bit8u packet_buffer[BX_PACKET_BUFSIZE];
static unsigned packet_len;
typedef void (*layer4_handler_t)(
void *this_ptr,
const Bit8u *ipheader,
unsigned ipheader_len,
unsigned sourceport,
unsigned targetport,
const Bit8u *data,
unsigned data_len
);
#define INET_PORT_FTPDATA 20
#define INET_PORT_FTP 21
#define INET_PORT_TIME 37
#define INET_PORT_NAME 42
#define INET_PORT_DOMAIN 53
#define INET_PORT_BOOTP_SERVER 67
#define INET_PORT_BOOTP_CLIENT 68
#define INET_PORT_HTTP 80
#define INET_PORT_NTP 123
// TFTP server support by EaseWay <easeway@123.com>
#define INET_PORT_TFTP_SERVER 69
#define TFTP_RRQ 1
#define TFTP_WRQ 2
#define TFTP_DATA 3
#define TFTP_ACK 4
#define TFTP_ERROR 5
#define TFTP_OPTACK 6
#define TFTP_BUFFER_SIZE 512
class bx_vnet_pktmover_c : public eth_pktmover_c {
public:
bx_vnet_pktmover_c();
void pktmover_init(
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:
void guest_to_host(const Bit8u *buf, unsigned io_len);
void host_to_guest(Bit8u *buf, unsigned io_len);
void process_arp(const Bit8u *buf, unsigned io_len);
void host_to_guest_arp(Bit8u *buf, unsigned io_len);
void process_ipv4(const Bit8u *buf, unsigned io_len);
void host_to_guest_ipv4(Bit8u *buf, unsigned io_len);
layer4_handler_t get_layer4_handler(
unsigned ipprotocol, unsigned port);
bx_bool register_layer4_handler(
unsigned ipprotocol, unsigned port,layer4_handler_t func);
bx_bool unregister_layer4_handler(
unsigned ipprotocol, unsigned port);
void process_icmpipv4(
const Bit8u *ipheader, unsigned ipheader_len,
const Bit8u *l4pkt, unsigned l4pkt_len);
void process_tcpipv4(
const Bit8u *ipheader, unsigned ipheader_len,
const Bit8u *l4pkt, unsigned l4pkt_len);
void process_udpipv4(
const Bit8u *ipheader, unsigned ipheader_len,
const Bit8u *l4pkt, unsigned l4pkt_len);
void host_to_guest_udpipv4_packet(
unsigned target_port, unsigned source_port,
const Bit8u *udpdata, unsigned udpdata_len);
void process_icmpipv4_echo(
const Bit8u *ipheader, unsigned ipheader_len,
const Bit8u *l4pkt, unsigned l4pkt_len);
static void udpipv4_dhcp_handler(
void *this_ptr,
const Bit8u *ipheader, unsigned ipheader_len,
unsigned sourceport, unsigned targetport,
const Bit8u *data, unsigned data_len);
void udpipv4_dhcp_handler_ns(
const Bit8u *ipheader, unsigned ipheader_len,
unsigned sourceport, unsigned targetport,
const Bit8u *data, unsigned data_len);
static void udpipv4_tftp_handler(
void *this_ptr,
const Bit8u *ipheader, unsigned ipheader_len,
unsigned sourceport, unsigned targetport,
const Bit8u *data, unsigned data_len);
void udpipv4_tftp_handler_ns(
const Bit8u *ipheader, unsigned ipheader_len,
unsigned sourceport, unsigned targetport,
const Bit8u *data, unsigned data_len);
void tftp_send_error(
Bit8u *buffer,
unsigned sourceport, unsigned targetport,
unsigned code, const char *msg);
void tftp_send_data(
Bit8u *buffer,
unsigned sourceport, unsigned targetport,
unsigned block_nr);
void tftp_send_ack(
Bit8u *buffer,
unsigned sourceport, unsigned targetport,
unsigned block_nr);
void tftp_send_optack(
Bit8u *buffer,
unsigned sourceport, unsigned targetport,
size_t tsize_option, unsigned blksize_option);
char tftp_filename[BX_PATHNAME_LEN];
char tftp_rootdir[BX_PATHNAME_LEN];
bx_bool tftp_write;
Bit16u tftp_tid;
dhcp_cfg_t dhcp;
struct {
unsigned ipprotocol;
unsigned port;
layer4_handler_t func;
} l4data[LAYER4_LISTEN_MAX];
unsigned l4data_used;
static void rx_timer_handler(void *);
void rx_timer(void);
int rx_timer_index;
unsigned netdev_speed;
unsigned tx_time;
#if BX_ETH_VNET_LOGGING
FILE *pktlog_txt;
#endif // BX_ETH_VNET_LOGGING
#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) {
bx_vnet_pktmover_c *pktmover;
pktmover = new bx_vnet_pktmover_c();
pktmover->pktmover_init(netif, macaddr, rxh, rxstat, dev, script);
return pktmover;
}
} bx_vnet_match;
// duplicate the part of tftp_send_data() that constructs the filename
// but ignore errors since tftp_send_data() will respond for us
static size_t get_file_size(bx_devmodel_c *netdev, const char *tpath, const char *tname)
{
struct stat stbuf;
char path[BX_PATHNAME_LEN];
if (strlen(tname) == 0)
return 0;
if ((strlen(tpath) + strlen(tname)) > BX_PATHNAME_LEN)
return 0;
sprintf(path, "%s/%s", tpath, tname);
if (stat(path, &stbuf) < 0)
return 0;
BX_INFO(("tftp filesize: %lu", (unsigned long)stbuf.st_size));
return (size_t)stbuf.st_size;
}
bx_vnet_pktmover_c::bx_vnet_pktmover_c()
{
}
void bx_vnet_pktmover_c::pktmover_init(
const char *netif, const char *macaddr,
eth_rx_handler_t rxh, eth_rx_status_t rxstat,
bx_devmodel_c *dev, const char *script)
{
this->netdev = dev;
BX_INFO(("vnet network driver"));
this->rxh = rxh;
this->rxstat = rxstat;
strcpy(this->tftp_rootdir, netif);
this->tftp_tid = 0;
this->tftp_write = 0;
memcpy(&dhcp.host_macaddr[0], macaddr, 6);
memcpy(&dhcp.guest_macaddr[0], macaddr, 6);
dhcp.host_macaddr[5] ^= 0x03;
memcpy(&dhcp.host_ipv4addr[0], &default_host_ipv4addr[0], 4);
memcpy(&dhcp.guest_ipv4addr[0], &broadcast_ipv4addr[1][0], 4);
dhcp.default_guest_ipv4addr = default_guest_ipv4addr;
memcpy(&dhcp.dns_ipv4addr[0], &broadcast_ipv4addr[0][0], 4);
l4data_used = 0;
register_layer4_handler(0x11,INET_PORT_BOOTP_SERVER,udpipv4_dhcp_handler);
register_layer4_handler(0x11,INET_PORT_TFTP_SERVER,udpipv4_tftp_handler);
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 =
bx_pc_system.register_timer(this, this->rx_timer_handler, 1000,
0, 0, "eth_vnet");
#if BX_ETH_VNET_LOGGING
pktlog_txt = fopen("ne2k-pktlog.txt", "wb");
if (!pktlog_txt) BX_PANIC(("ne2k-pktlog.txt failed"));
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 & dhcp.guest_macaddr[i], i<5?":" : "\n");
fprintf(pktlog_txt, "--\n");
fflush(pktlog_txt);
#endif
#if BX_ETH_VNET_PCAP_LOGGING
pcapp = pcap_open_dead(DLT_EN10MB, BX_PACKET_BUFSIZE);
pktlog_pcap = pcap_dump_open(pcapp, "ne2k-pktlog.pcap");
if (pktlog_pcap == NULL) BX_PANIC(("ne2k-pktlog.pcap failed"));
#endif
}
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 BX_ETH_VNET_LOGGING
write_pktlog_txt(pktlog_txt, buf, io_len, 0);
#endif
#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;
if ((io_len >= 14) &&
(!memcmp(&buf[6],&dhcp.guest_macaddr[0],6)) &&
(!memcmp(&buf[0],&dhcp.host_macaddr[0],6) ||
!memcmp(&buf[0],&broadcast_macaddr[0],6))) {
switch (get_net2(&buf[12])) {
case 0x0800: // IPv4.
process_ipv4(buf, io_len);
break;
case 0x0806: // ARP.
process_arp(buf, io_len);
break;
default: // unknown packet type.
break;
}
}
}
// 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 BX_ETH_VNET_LOGGING
write_pktlog_txt(pktlog_txt, packet_buffer, packet_len, 1);
#endif
#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
} else {
BX_ERROR(("device not ready to receive data"));
}
}
void bx_vnet_pktmover_c::host_to_guest(Bit8u *buf, unsigned io_len)
{
Bit8u localbuf[60];
if (io_len < 14) {
BX_PANIC(("host_to_guest: io_len < 14!"));
return;
}
if (io_len < 60) {
memcpy(&localbuf[0],&buf[0],io_len);
memset(&localbuf[io_len],0,60-io_len);
buf=localbuf;
io_len=60;
}
packet_len = io_len;
memcpy(&packet_buffer, &buf[0], io_len);
unsigned rx_time = (64 + 96 + 4 * 8 + io_len * 8) / this->netdev_speed;
bx_pc_system.activate_timer(this->rx_timer_index, this->tx_time + rx_time + 100, 0);
}
/////////////////////////////////////////////////////////////////////////
// ARP
/////////////////////////////////////////////////////////////////////////
void bx_vnet_pktmover_c::process_arp(const Bit8u *buf, unsigned io_len)
{
unsigned opcode;
unsigned protocol;
Bit8u replybuf[60];
if (io_len < 22) return;
if (io_len < (unsigned)(22+buf[18]*2+buf[19]*2)) return;
// hardware:Ethernet
if (buf[14] != 0x00 || buf[15] != 0x01 || buf[18] != 0x06) return;
opcode = get_net2(&buf[20]);
protocol = get_net2(&buf[16]);
memset(&replybuf[0],0,60);
// protocol
switch (protocol) {
case 0x0800: // IPv4
if (buf[19] == 0x04) {
switch (opcode) {
case 0x0001: // ARP REQUEST
if (!memcmp(&buf[22],&dhcp.guest_macaddr[0],6)) {
memcpy(&dhcp.guest_ipv4addr[0],&buf[28],4);
if (!memcmp(&buf[38],&dhcp.host_ipv4addr[0],4)) {
memcpy(&replybuf[14],&buf[14],6);
replybuf[20]=0x00;
replybuf[21]=0x02;
memcpy(&replybuf[22],&dhcp.host_macaddr[0],6);
memcpy(&replybuf[28],&dhcp.host_ipv4addr[0],4);
memcpy(&replybuf[32],&dhcp.guest_macaddr[0],6);
memcpy(&replybuf[38],&dhcp.guest_ipv4addr[0],4);
host_to_guest_arp(replybuf,60);
}
}
break;
case 0x0002: // ARP REPLY
BX_INFO(("unexpected ARP REPLY"));
break;
case 0x0003: // RARP REQUEST
BX_ERROR(("RARP is not implemented"));
break;
case 0x0004: // RARP REPLY
BX_INFO(("unexpected RARP REPLY"));
break;
default:
BX_INFO(("arp: unknown ARP opcode %04x",opcode));
break;
}
}
else
{
BX_INFO(("arp: unknown address length %u",(unsigned)buf[19]));
}
break;
default:
BX_INFO(("arp: unknown protocol 0x%04x",protocol));
break;
}
}
void bx_vnet_pktmover_c::host_to_guest_arp(Bit8u *buf, unsigned io_len)
{
memcpy(&buf[0],&dhcp.guest_macaddr[0],6);
memcpy(&buf[6],&dhcp.host_macaddr[0],6);
buf[12]=0x08;
buf[13]=0x06;
host_to_guest(buf,io_len);
}
/////////////////////////////////////////////////////////////////////////
// IPv4
/////////////////////////////////////////////////////////////////////////
void bx_vnet_pktmover_c::process_ipv4(const Bit8u *buf, unsigned io_len)
{
unsigned total_len;
unsigned packet_id;
unsigned fragment_flags;
unsigned fragment_offset;
unsigned ipproto;
unsigned l3header_len;
const Bit8u *l4pkt;
unsigned l4pkt_len;
if (io_len < (14U+20U)) {
BX_INFO(("ip packet - too small packet"));
return;
}
if ((buf[14+0] & 0xf0) != 0x40) {
BX_INFO(("ipv%u packet - not implemented",((unsigned)buf[14+0] >> 4)));
return;
}
l3header_len = ((unsigned)(buf[14+0] & 0x0f) << 2);
if (l3header_len != 20) {
BX_ERROR(("ip: option header is not implemented"));
return;
}
if (io_len < (14U+l3header_len)) return;
if (ip_checksum(&buf[14],l3header_len) != (Bit16u)0xffff) {
BX_INFO(("ip: invalid checksum"));
return;
}
total_len = get_net2(&buf[14+2]);
// FIXED By EaseWay
// Ignore this check to tolerant some cases
//if (io_len > (14U+total_len)) return;
if (memcmp(&buf[14+16],dhcp.host_ipv4addr,4) &&
memcmp(&buf[14+16],broadcast_ipv4addr[0],4) &&
memcmp(&buf[14+16],broadcast_ipv4addr[1],4) &&
memcmp(&buf[14+16],broadcast_ipv4addr[2],4))
{
BX_INFO(("target IP address %u.%u.%u.%u is unknown",
(unsigned)buf[14+16],(unsigned)buf[14+17],
(unsigned)buf[14+18],(unsigned)buf[14+19]));
return;
}
packet_id = get_net2(&buf[14+4]);
fragment_flags = (unsigned)buf[14+6] >> 5;
fragment_offset = ((unsigned)get_net2(&buf[14+6]) & 0x1fff) << 3;
ipproto = buf[14+9];
if ((fragment_flags & 0x1) || (fragment_offset != 0)) {
BX_INFO(("ignore fragmented packet!"));
return;
} else {
l4pkt = &buf[14 + l3header_len];
l4pkt_len = total_len - l3header_len;
}
switch (ipproto) {
case 0x01: // ICMP
process_icmpipv4(&buf[14],l3header_len,l4pkt,l4pkt_len);
break;
case 0x06: // TCP
process_tcpipv4(&buf[14],l3header_len,l4pkt,l4pkt_len);
break;
case 0x11: // UDP
process_udpipv4(&buf[14],l3header_len,l4pkt,l4pkt_len);
break;
default:
BX_INFO(("unknown IP protocol %02x",ipproto));
break;
}
}
void bx_vnet_pktmover_c::host_to_guest_ipv4(Bit8u *buf, unsigned io_len)
{
unsigned l3header_len;
memcpy(&buf[0],&dhcp.guest_macaddr[0],6);
memcpy(&buf[6],&dhcp.host_macaddr[0],6);
buf[12]=0x08;
buf[13]=0x00;
buf[14+0] = (buf[14+0] & 0x0f) | 0x40;
l3header_len = ((unsigned)(buf[14+0] & 0x0f) << 2);
memcpy(&buf[14+12],&dhcp.host_ipv4addr[0],4);
memcpy(&buf[14+16],&dhcp.guest_ipv4addr[0],4);
put_net2(&buf[14+10], 0);
put_net2(&buf[14+10], ip_checksum(&buf[14],l3header_len) ^ (Bit16u)0xffff);
host_to_guest(buf,io_len);
}
layer4_handler_t bx_vnet_pktmover_c::get_layer4_handler(
unsigned ipprotocol, unsigned port)
{
unsigned n;
for (n = 0; n < l4data_used; n++) {
if (l4data[n].ipprotocol == ipprotocol && l4data[n].port == port)
return l4data[n].func;
}
return (layer4_handler_t)NULL;
}
bx_bool bx_vnet_pktmover_c::register_layer4_handler(
unsigned ipprotocol, unsigned port,layer4_handler_t func)
{
if (get_layer4_handler(ipprotocol,port) != (layer4_handler_t)NULL) {
BX_INFO(("IP protocol 0x%02x port %u is already in use",
ipprotocol,port));
return false;
}
unsigned n;
for (n = 0; n < l4data_used; n++) {
if (l4data[n].func == (layer4_handler_t)NULL) {
break;
}
}
if (n == l4data_used) {
if (n >= LAYER4_LISTEN_MAX) {
BX_ERROR(("vnet: LAYER4_LISTEN_MAX is too small"));
return false;
}
l4data_used++;
}
l4data[n].ipprotocol = ipprotocol;
l4data[n].port = port;
l4data[n].func = func;
return true;
}
bx_bool bx_vnet_pktmover_c::unregister_layer4_handler(
unsigned ipprotocol, unsigned port)
{
unsigned n;
for (n = 0; n < l4data_used; n++) {
if (l4data[n].ipprotocol == ipprotocol && l4data[n].port == port) {
l4data[n].func = (layer4_handler_t)NULL;
return true;
}
}
BX_ERROR(("IP protocol 0x%02x port %u is not registered",
ipprotocol,port));
return false;
}
void bx_vnet_pktmover_c::process_icmpipv4(
const Bit8u *ipheader, unsigned ipheader_len,
const Bit8u *l4pkt, unsigned l4pkt_len)
{
unsigned icmptype;
unsigned icmpcode;
if (l4pkt_len < 8) return;
icmptype = l4pkt[0];
icmpcode = l4pkt[1];
if (ip_checksum(l4pkt,l4pkt_len) != (Bit16u)0xffff) {
BX_INFO(("icmp: invalid checksum"));
return;
}
switch (icmptype) {
case 0x08: // ECHO
if (icmpcode == 0) {
process_icmpipv4_echo(ipheader,ipheader_len,l4pkt,l4pkt_len);
}
break;
default:
BX_INFO(("unhandled icmp packet: type=%u code=%u",
icmptype, icmpcode));
break;
}
}
void bx_vnet_pktmover_c::process_tcpipv4(
const Bit8u *ipheader, unsigned ipheader_len,
const Bit8u *l4pkt, unsigned l4pkt_len)
{
if (l4pkt_len < 20) return;
BX_INFO(("tcp packet - not implemented"));
}
void bx_vnet_pktmover_c::process_udpipv4(
const Bit8u *ipheader, unsigned ipheader_len,
const Bit8u *l4pkt, unsigned l4pkt_len)
{
unsigned udp_targetport;
unsigned udp_sourceport;
unsigned udp_len;
layer4_handler_t func;
if (l4pkt_len < 8) return;
udp_sourceport = get_net2(&l4pkt[0]);
udp_targetport = get_net2(&l4pkt[2]);
udp_len = get_net2(&l4pkt[4]);
func = get_layer4_handler(0x11,udp_targetport);
if (func != (layer4_handler_t)NULL) {
(*func)((void *)this,ipheader,ipheader_len,
udp_sourceport,udp_targetport,&l4pkt[8],l4pkt_len-8);
} else {
BX_INFO(("udp - unhandled port %u",udp_targetport));
}
}
void bx_vnet_pktmover_c::host_to_guest_udpipv4_packet(
unsigned target_port, unsigned source_port,
const Bit8u *udpdata, unsigned udpdata_len)
{
Bit8u ipbuf[BX_PACKET_BUFSIZE];
if ((udpdata_len + 42U) > BX_PACKET_BUFSIZE) {
BX_PANIC(("generated udp data is too long"));
return;
}
// udp pseudo-header
ipbuf[34U-12U]=0;
ipbuf[34U-11U]=0x11; // UDP
put_net2(&ipbuf[34U-10U],8U+udpdata_len);
memcpy(&ipbuf[34U-8U],dhcp.host_ipv4addr,4);
memcpy(&ipbuf[34U-4U],dhcp.guest_ipv4addr,4);
// udp header
put_net2(&ipbuf[34U+0],source_port);
put_net2(&ipbuf[34U+2],target_port);
put_net2(&ipbuf[34U+4],8U+udpdata_len);
put_net2(&ipbuf[34U+6],0);
memcpy(&ipbuf[42U],udpdata,udpdata_len);
put_net2(&ipbuf[34U+6], ip_checksum(&ipbuf[34U-12U],12U+8U+udpdata_len) ^ (Bit16u)0xffff);
// ip header
memset(&ipbuf[14U],0,20U);
ipbuf[14U+0] = 0x45;
ipbuf[14U+1] = 0x00;
put_net2(&ipbuf[14U+2],20U+8U+udpdata_len);
put_net2(&ipbuf[14U+4],1);
ipbuf[14U+6] = 0x00;
ipbuf[14U+7] = 0x00;
ipbuf[14U+8] = 0x07; // TTL
ipbuf[14U+9] = 0x11; // UDP
host_to_guest_ipv4(ipbuf,udpdata_len + 42U);
}
/////////////////////////////////////////////////////////////////////////
// ICMP/IPv4
/////////////////////////////////////////////////////////////////////////
void bx_vnet_pktmover_c::process_icmpipv4_echo(
const Bit8u *ipheader, unsigned ipheader_len,
const Bit8u *l4pkt, unsigned l4pkt_len)
{
Bit8u replybuf[ICMP_ECHO_PACKET_MAX];
if ((14U+ipheader_len+l4pkt_len) > ICMP_ECHO_PACKET_MAX) {
BX_ERROR(("icmp echo: size of an echo packet is too long"));
return;
}
memcpy(&replybuf[14],ipheader,ipheader_len);
memcpy(&replybuf[14+ipheader_len],l4pkt,l4pkt_len);
replybuf[14+ipheader_len+0] = 0x00; // echo reply
put_net2(&replybuf[14+ipheader_len+2],0);
put_net2(&replybuf[14+ipheader_len+2],
ip_checksum(&replybuf[14+ipheader_len],l4pkt_len) ^ (Bit16u)0xffff);
host_to_guest_ipv4(replybuf,14U+ipheader_len+l4pkt_len);
}
/////////////////////////////////////////////////////////////////////////
// DHCP/UDP/IPv4
/////////////////////////////////////////////////////////////////////////
void bx_vnet_pktmover_c::udpipv4_dhcp_handler(
void *this_ptr,
const Bit8u *ipheader, unsigned ipheader_len,
unsigned sourceport, unsigned targetport,
const Bit8u *data, unsigned data_len)
{
((bx_vnet_pktmover_c *)this_ptr)->udpipv4_dhcp_handler_ns(
ipheader,ipheader_len,sourceport,targetport,data,data_len);
}
void bx_vnet_pktmover_c::udpipv4_dhcp_handler_ns(
const Bit8u *ipheader, unsigned ipheader_len,
unsigned sourceport, unsigned targetport,
const Bit8u *data, unsigned data_len)
{
Bit8u replybuf[576];
unsigned opts_len;
opts_len = process_dhcp(netdev, data, data_len, replybuf, &dhcp);
if (opts_len > 0) {
host_to_guest_udpipv4_packet(sourceport, targetport, replybuf, opts_len);
}
}
void bx_vnet_pktmover_c::udpipv4_tftp_handler(
void *this_ptr,
const Bit8u *ipheader, unsigned ipheader_len,
unsigned sourceport, unsigned targetport,
const Bit8u *data, unsigned data_len)
{
((bx_vnet_pktmover_c *)this_ptr)->udpipv4_tftp_handler_ns(
ipheader,ipheader_len,sourceport,targetport,data,data_len);
}
void bx_vnet_pktmover_c::udpipv4_tftp_handler_ns(
const Bit8u *ipheader, unsigned ipheader_len,
unsigned sourceport, unsigned targetport,
const Bit8u *data, unsigned data_len)
{
Bit8u buffer[TFTP_BUFFER_SIZE + 4];
char path[BX_PATHNAME_LEN];
FILE *fp;
unsigned block_nr;
unsigned tftp_len;
switch (get_net2(data)) {
case TFTP_RRQ:
if (tftp_tid == 0) {
strncpy((char*)buffer, (const char*)data + 2, data_len - 2);
buffer[data_len - 4] = 0;
// options
size_t tsize_option = 0;
int blksize_option = 0;
if (strlen((char*)buffer) < data_len - 2) {
const char *mode = (const char*)data + 2 + strlen((char*)buffer) + 1;
int octet_option = 0;
while (mode < (const char*)data + data_len) {
if (memcmp(mode, "octet\0", 6) == 0) {
mode += 6;
octet_option = 1;
} else if (memcmp(mode, "tsize\0", 6) == 0) {
mode += 6;
tsize_option = 1; // size needed
mode += strlen(mode)+1;
} else if (memcmp(mode, "blksize\0", 8) == 0) {
mode += 8;
blksize_option = atoi(mode);
mode += strlen(mode)+1;
} else {
BX_INFO(("tftp req: unknown option %s", mode));
break;
}
}
if (!octet_option) {
tftp_send_error(buffer, sourceport, targetport, 4, "Unsupported transfer mode");
return;
}
}
strcpy(tftp_filename, (char*)buffer);
BX_INFO(("tftp req: %s", tftp_filename));
if (tsize_option) {
tsize_option = get_file_size(netdev, tftp_rootdir, tftp_filename);
if (tsize_option > 0) {
// if tsize requested and file exists, send optack and return
// optack ack will pick up where we leave off here.
// if blksize_option is less than TFTP_BUFFER_SIZE should
// probably use blksize_option...
tftp_send_optack(buffer, sourceport, targetport, tsize_option, TFTP_BUFFER_SIZE);
return;
}
}
tftp_tid = sourceport;
tftp_write = 0;
tftp_send_data(buffer, sourceport, targetport, 1);
} else {
tftp_send_error(buffer, sourceport, targetport, 4, "Illegal request");
}
break;
case TFTP_WRQ:
if (tftp_tid == 0) {
strncpy((char*)buffer, (const char*)data + 2, data_len - 2);
buffer[data_len - 4] = 0;
// transfer mode
if (strlen((char*)buffer) < data_len - 2) {
const char *mode = (const char*)data + 2 + strlen((char*)buffer) + 1;
if (memcmp(mode, "octet\0", 6) != 0) {
tftp_send_error(buffer, sourceport, targetport, 4, "Unsupported transfer mode");
return;
}
}
strcpy(tftp_filename, (char*)buffer);
sprintf(path, "%s/%s", tftp_rootdir, tftp_filename);
fp = fopen(path, "rb");
if (fp) {
tftp_send_error(buffer, sourceport, targetport, 6, "File exists");
fclose(fp);
return;
}
fp = fopen(path, "wb");
if (!fp) {
tftp_send_error(buffer, sourceport, targetport, 2, "Access violation");
return;
}
fclose(fp);
tftp_tid = sourceport;
tftp_write = 1;
tftp_send_ack(buffer, sourceport, targetport, 0);
} else {
tftp_send_error(buffer, sourceport, targetport, 4, "Illegal request");
}
break;
case TFTP_DATA:
if ((tftp_tid == sourceport) && (tftp_write == 1)) {
block_nr = get_net2(data + 2);
strncpy((char*)buffer, (const char*)data + 4, data_len - 4);
tftp_len = data_len - 4;
buffer[tftp_len] = 0;
if (tftp_len <= 512) {
sprintf(path, "%s/%s", tftp_rootdir, tftp_filename);
fp = fopen(path, "ab");
if (!fp) {
tftp_send_error(buffer, sourceport, targetport, 2, "Access violation");
return;
}
if (fseek(fp, (block_nr - 1) * TFTP_BUFFER_SIZE, SEEK_SET) < 0) {
tftp_send_error(buffer, sourceport, targetport, 3, "Block not seekable");
return;
}
fwrite(buffer, 1, tftp_len, fp);
fclose(fp);
tftp_send_ack(buffer, sourceport, targetport, block_nr);
if (tftp_len < 512) {
tftp_tid = 0;
}
} else {
tftp_send_error(buffer, sourceport, targetport, 4, "Illegal request");
}
} else {
tftp_send_error(buffer, sourceport, targetport, 4, "Illegal request");
}
break;
case TFTP_ACK:
tftp_send_data(buffer, sourceport, targetport, get_net2(data + 2) + 1);
break;
case TFTP_ERROR:
// silently ignore error packets
break;
default:
BX_ERROR(("TFTP unknown opt %d", get_net2(data)));
}
}
void bx_vnet_pktmover_c::tftp_send_error(
Bit8u *buffer,
unsigned sourceport, unsigned targetport,
unsigned code, const char *msg)
{
put_net2(buffer, TFTP_ERROR);
put_net2(buffer + 2, code);
strcpy((char*)buffer + 4, msg);
host_to_guest_udpipv4_packet(sourceport, targetport, buffer, strlen(msg) + 5);
tftp_tid = 0;
}
void bx_vnet_pktmover_c::tftp_send_data(
Bit8u *buffer,
unsigned sourceport, unsigned targetport,
unsigned block_nr)
{
char path[BX_PATHNAME_LEN];
char msg[BX_PATHNAME_LEN];
int rd;
if (strlen(tftp_filename) == 0) {
tftp_send_error(buffer, sourceport, targetport, 1, "File not found");
return;
}
if ((strlen(tftp_rootdir) + strlen(tftp_filename)) > BX_PATHNAME_LEN) {
tftp_send_error(buffer, sourceport, targetport, 1, "Path name too long");
return;
}
sprintf(path, "%s/%s", tftp_rootdir, tftp_filename);
FILE *fp = fopen(path, "rb");
if (!fp) {
sprintf(msg, "File not found: %s", tftp_filename);
tftp_send_error(buffer, sourceport, targetport, 1, msg);
return;
}
if (fseek(fp, (block_nr - 1) * TFTP_BUFFER_SIZE, SEEK_SET) < 0) {
tftp_send_error(buffer, sourceport, targetport, 3, "Block not seekable");
return;
}
rd = fread(buffer + 4, 1, TFTP_BUFFER_SIZE, fp);
fclose(fp);
if (rd < 0) {
tftp_send_error(buffer, sourceport, targetport, 3, "Block not readable");
return;
}
put_net2(buffer, TFTP_DATA);
put_net2(buffer + 2, block_nr);
host_to_guest_udpipv4_packet(sourceport, targetport, buffer, rd + 4);
if (rd < TFTP_BUFFER_SIZE) {
tftp_tid = 0;
}
}
void bx_vnet_pktmover_c::tftp_send_ack(
Bit8u *buffer,
unsigned sourceport, unsigned targetport,
unsigned block_nr)
{
put_net2(buffer, TFTP_ACK);
put_net2(buffer + 2, block_nr);
host_to_guest_udpipv4_packet(sourceport, targetport, buffer, 4);
}
void bx_vnet_pktmover_c::tftp_send_optack(
Bit8u *buffer,
unsigned sourceport, unsigned targetport,
size_t tsize_option, unsigned blksize_option)
{
Bit8u *p = buffer;
put_net2(p, TFTP_OPTACK);
p += 2;
if (tsize_option > 0) {
*p++='t'; *p++='s'; *p++='i'; *p++='z'; *p++='e'; *p++='\0';
sprintf((char *)p, "%lu", (unsigned long)tsize_option);
p += strlen((const char *)p) + 1;
}
if (blksize_option > 0) {
*p++='b'; *p++='l'; *p++='k'; *p++='s'; *p++='i'; *p++='z'; *p++='e'; *p++='\0';
sprintf((char *)p, "%d", blksize_option); p += strlen((const char *)p) + 1;
}
host_to_guest_udpipv4_packet(sourceport, targetport, buffer, p - buffer);
}
#endif /* if BX_NETWORKING */
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