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/////////////////////////////////////////////////////////////////////////
// $Id: eth_packetmaker.cc,v 1.14 2005/12/10 18:37:35 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
// 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
#define NP_DEVICE_INCLUDES
#include "iodev.h"
#if BX_NETWORKING && defined(ETH_ARPBACK)
#include "eth_packetmaker.h"
bx_bool sendable(const eth_packet& outpacket) {
//FINISH ME!
return 0;
}
Bit32u eth_IPmaker::datalen(const eth_packet& outpacket) {
Bit32u out;
out=((outpacket.buf[16]<<8)+outpacket.buf[17])-(4*(0xF & outpacket.buf[14]));
return out;
}
const Bit8u * eth_IPmaker::datagram(const eth_packet& outpacket) {
const Bit8u * out;
out=outpacket.buf+14+(4*(0xF & outpacket.buf[14]));
return out;
}
Bit32u eth_IPmaker::build_packet_header(Bit32u source, Bit32u dest, Bit8u protocol, Bit32u datalen) {
Bit32u temp;
Bit32u i;
memcpy(pending.buf,internal_mac,6);
memcpy(pending.buf+6,external_mac,6);
memcpy(pending.buf+12,ethtype_ip,2);
pending.buf[14]=0x45;
pending.buf[15]=0;
temp=datalen+20;
pending.buf[16]=(temp>>8) & 0xFF;
pending.buf[17]=temp & 0xFF;
pending.buf[18]=0;
pending.buf[19]=0;
pending.buf[20]=0;
pending.buf[21]=0;
pending.buf[22]=30;
pending.buf[23]=protocol;
pending.buf[24]=0;
pending.buf[25]=0;
pending.buf[26]=(source>>24) & 0xFF;
pending.buf[27]=(source>>16) & 0xFF;
pending.buf[28]=(source>>8) & 0xFF;
pending.buf[29]=(source) & 0xFF;
pending.buf[30]=(dest>>24) & 0xFF;
pending.buf[31]=(dest>>16) & 0xFF;
pending.buf[32]=(dest>>8) & 0xFF;
pending.buf[33]=(dest) & 0xFF;
//Compute Checksum
temp=0;
for(i=14;i<34;i=i+2) {
Bit32u addee=pending.buf[i];
addee=(addee<<8) & pending.buf[i+1];
temp=temp+addee;
}
temp=(temp>>16)+(temp&0xFFFF);
temp=(temp>>16)+(temp&0xFFFF);
pending.buf[24]=~(Bit8u)((temp>>8) & 0xFF);
pending.buf[25]=~(Bit8u)(temp & 0xFF);
return(34);
}
Bit8u eth_IPmaker::protocol(const eth_packet& outpacket) {
return (*(outpacket.buf+23) & 0xff);
}
Bit32u eth_IPmaker::source(const eth_packet& outpacket) {
Bit32u out;
out=0xFF & *(outpacket.buf+26);
out=(out<<8) | (0xFF & *(outpacket.buf+27));
out=(out<<8) | (0xFF & *(outpacket.buf+28));
out=(out<<8) | (0xFF & *(outpacket.buf+29));
return out;
}
Bit32u eth_IPmaker::destination(const eth_packet& outpacket) {
Bit32u out;
out=0xFF & *(outpacket.buf+30);
out=(out<<8) | (0xFF & *(outpacket.buf+31));
out=(out<<8) | (0xFF & *(outpacket.buf+32));
out=(out<<8) | (0xFF & *(outpacket.buf+33));
return out;
}
void eth_IPmaker::init(void) {
is_pending=0;
}
void
eth_ETHmaker::init(void) {
arper.init();
}
bx_bool
eth_ETHmaker::getpacket(eth_packet& inpacket) {
return arper.getpacket(inpacket);
}
bx_bool
eth_ETHmaker::ishandler(const eth_packet& outpacket) {
if((outpacket.len>=60) &&
( (!memcmp(outpacket.buf, external_mac, 6))
|| (!memcmp(outpacket.buf, broadcast_macaddr, 6)) ) &&
( (!memcmp(outpacket.buf+12, ethtype_arp, 2)) ||
(!memcmp(outpacket.buf+12, ethtype_ip, 2)) ) &&
(outpacket.len<PACKET_BUF_SIZE)
) {
return 1;
}
return 0;
}
bx_bool
eth_ETHmaker::sendpacket(const eth_packet& outpacket) {
return arper.sendpacket(outpacket);
}
void
eth_ARPmaker::init(void) {
is_pending=0;
pending.len=0;
}
bx_bool
eth_ARPmaker::getpacket(eth_packet& inpacket) {
if(is_pending) {
memcpy(inpacket.buf,pending.buf,pending.len);
inpacket.len=pending.len;
is_pending=0;
return 1;
}
return 0;
}
bx_bool
eth_ARPmaker::ishandler(const eth_packet& outpacket) {
if((outpacket.len>=60) &&
(!memcmp(outpacket.buf+12, ethtype_arp, 2)) &&
(outpacket.len<PACKET_BUF_SIZE) &&
( (!memcmp(outpacket.buf, external_mac, 6))
|| (!memcmp(outpacket.buf, broadcast_macaddr, 6)) ) &&
(!memcmp(outpacket.buf+38, external_ip, 4))
) {
return 1;
}
return 0;
}
bx_bool
eth_ARPmaker::sendpacket(const eth_packet& outpacket) {
if(is_pending || !ishandler(outpacket)) {
return 0;
} else {
//Bit32u tempcrc;
memcpy(pending.buf,outpacket.buf,outpacket.len); //move to temporary buffer
memcpy(pending.buf, pending.buf+6, 6); //set destination to sender
memcpy(pending.buf+6, external_mac, 6); //set sender to us
memcpy(pending.buf+32, pending.buf+22, 10); //move destination to sender
memcpy(pending.buf+22, external_mac, 6); //set sender to us
memcpy(pending.buf+28, external_ip, 4); //set sender to us
pending.buf[21]=2; //make this a reply and not a request
//tempcrc=mycrc.get_CRC(pending.buf,len);
//memcpy(pending.buf+len, &tempcrc, 4);
pending.len=outpacket.len; //+4
is_pending=1;
return 1;
}
}
#endif /* if BX_NETWORKING && defined(ETH_ARPBACK) */
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