Started adding support for IP packets.

bochs/iodev/eth_packetmaker.cc

@@ -1,6 +1,91 @@
 #include "eth_packetmaker.h"
 #include "bochs.h"
 
+
+Boolean sendable(const eth_packet& outpacket) {
+  //FINISH ME!
+}
+
+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) {
+  Bit8u out;
+  out=0xFF & *(outpacket.buf+23);
+}
+
+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();

bochs/iodev/eth_packetmaker.h

@@ -5,6 +5,7 @@
 #include "../config.h"
 
 #define PACKET_BUF_SIZE 2048
+static const Bit8u internal_mac[]={0xB0, 0xC4, 0x20, 0x20, 0x00, 0x00, 0x00};
 static const Bit8u external_mac[]={0xB0, 0xC4, 0x20, 0x20, 0x00, 0x00, 0x00};
 static const Bit8u external_ip[]={ 192, 168, 0, 2, 0x00 };
 static const Bit8u broadcast_mac[]={0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00};
@@ -39,20 +40,29 @@ private:
 };
 
 
-/*
 class eth_IPmaker : eth_packetmaker {
 public:
   void init(void);
-  virtual Boolean ishandler(const eth_packet& outpacket);
-  virtual Boolean sendpacket(const eth_packet& outpacket);
-  virtual Boolean getpacket(eth_packet& inpacket);
-private:
+  virtual Boolean ishandler(const eth_packet& outpacket)=0;
+  virtual Boolean sendpacket(const eth_packet& outpacket)=0;
+  virtual Boolean getpacket(eth_packet& inpacket)=0;
+
+protected:
+  Boolean sendable(const eth_packet& outpacket);
+
+  Bit32u source(const eth_packet& outpacket);
+  Bit32u destination(const eth_packet& outpacket);
+  Bit8u protocol(const eth_packet& outpacket);
+
+  const Bit8u * datagram(const eth_packet& outpacket);
+  Bit32u datalen(const eth_packet& outpacket);
+
+  //Build a header in pending, return header length in bytes.
+  Bit32u build_packet_header(Bit32u source, Bit32u dest, Bit8u protocol, Bit32u datalen);
+
   eth_packet pending;
   Boolean is_pending;
 
-  Bit32u Destination;
-  Bit32u Source;
-
   //Bit8u Version; //=4 (4 bits)
   //It better be!
 
@@ -92,6 +102,7 @@ private:
   //Bit32u Destination;//destination address
 };
 
+/*
 class eth_TCPmaker : eth_packetmaker {
 };