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/*--------------------------------------------------------------------
 * TITLE: Plasma TCP/IP Protocol Stack
 * AUTHOR: Steve Rhoads (rhoadss@yahoo.com)
 * DATE CREATED: 4/22/06
 * FILENAME: tcpip.c
 * PROJECT: Plasma CPU core
 * COPYRIGHT: Software placed into the public domain by the author.
 *    Software 'as is' without warranty.  Author liable for nothing.
 * DESCRIPTION:
 *    Plasma TCP/IP Protocol Stack
 *
 *    Possible call stack when receiving a packet:
 *       IPMainThread()
 *          IPProcessEthernetPacket()
 *             IPProcessTCPPacket()
 *                TCPSendPacket()
 *                   IPSendPacket()
 *                      IPChecksum()
 *                      IPSendFrame()
 *                         FrameInsert()
 *--------------------------------------------------------------------*/
#ifdef WIN32
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#define _LIBC
#endif
#include "rtos.h"
#define IPPRINTF
#include "tcpip.h"
 
 
//ETHER FIELD                 OFFSET   LENGTH   VALUE
#define ETHERNET_DEST         0        //6
#define ETHERNET_SOURCE       6        //6
#define ETHERNET_FRAME_TYPE   12       //2      IP=0x0800; ARP=0x0806
 
//ARP   FIELD                 OFFSET   LENGTH   VALUE
#define ARP_HARD_TYPE         14       //2      0x0001
#define ARP_PROT_TYPE         16       //2      0x0800
#define ARP_HARD_SIZE         18       //1      0x06
#define ARP_PROT_SIZE         19       //1      0x04
#define ARP_OP                20       //2      ARP=1;ARPreply=2
#define ARP_ETHERNET_SENDER   22       //6
#define ARP_IP_SENDER         28       //4
#define ARP_ETHERNET_TARGET   32       //6
#define ARP_IP_TARGET         38       //4
#define ARP_PAD               42       //18     0
 
//IP    FIELD                 OFFSET   LENGTH   VALUE
#define IP_VERSION_LENGTH     14       //1      0x45
#define IP_TYPE_OF_SERVICE    15       //1      0x00
#define IP_LENGTH             16       //2
#define IP_ID16               18       //2
#define IP_FRAG_OFFSET        20       //2
#define IP_TIME_TO_LIVE       22       //1      0x80
#define IP_PROTOCOL           23       //1      TCP=0x06;PING=0x01;UDP=0x11
#define IP_CHECKSUM           24       //2
#define IP_SOURCE             26       //4
#define IP_DEST               30       //4
 
//PSEUDO FIELD                OFFSET   LENGTH   VALUE
#define PSEUDO_IP_SOURCE      0        //4
#define PSEUDO_IP_DEST        4        //4
#define PSEUDO_ZERO           8        //1      0
#define PSEUDO_IP_PROTOCOL    9        //1
#define PSEUDO_LENGTH         10       //2
 
//UDP   FIELD                 OFFSET   LENGTH   VALUE
#define UDP_SOURCE_PORT       34       //2
#define UDP_DEST_PORT         36       //2
#define UDP_LENGTH            38       //2
#define UDP_CHECKSUM          40       //2
#define UDP_DATA              42
 
//DHCP  FIELD                 OFFSET   LENGTH   VALUE
#define DHCP_OPCODE           42       //1      REQUEST=1;REPLY=2
#define DHCP_HW_TYPE          43       //1      1
#define DHCP_HW_LEN           44       //1      6
#define DHCP_HOP_COUNT        45       //1      0
#define DHCP_TRANS_ID         46       //4
#define DHCP_NUM_SEC          50       //2      0
#define DHCP_UNUSED           52       //2
#define DHCP_CLIENT_IP        54       //4
#define DHCP_YOUR_IP          58       //4
#define DHCP_SERVER_IP        62       //4
#define DHCP_GATEWAY_IP       66       //4
#define DHCP_CLIENT_ETHERNET  70       //16
#define DHCP_SERVER_NAME      86       //64
#define DHCP_BOOT_FILENAME    150      //128
#define DHCP_MAGIC_COOKIE     278      //4      0x63825363
#define DHCP_OPTIONS          282      //N
 
#define DHCP_MESSAGE_TYPE     53       //1 type
#define DHCP_DISCOVER         1
#define DHCP_OFFER            2
#define DHCP_REQUEST          3
#define DHCP_ACK              5
#define DHCP_REQUEST_IP       50       //4 ip
#define DHCP_REQUEST_SERV_IP  54       //4 ip
#define DHCP_CLIENT_ID        61       //7 1 ethernet
#define DHCP_HOST_NAME        12       //6 plasma
#define DHCP_PARAMS           55       //4 1=subnet; 15=domain_name; 3=router; 6=dns
#define DHCP_PARAM_SUBNET     1
#define DHCP_PARAM_ROUTER     3
#define DHCP_PARAM_DNS        6
#define DHCP_END_OPTION       0xff
 
//DHCP  FIELD                 OFFSET   LENGTH   VALUE
#define DNS_ID                0        //2    
#define DNS_FLAGS             2        //2      
#define DNS_NUM_QUESTIONS     4        //2      1 
#define DNS_NUM_ANSWERS_RR    6        //2      0/1
#define DNS_NUM_AUTHORITY_RR  8        //2      0 
#define DNS_NUM_ADDITIONAL_RR 10       //2      0
#define DNS_QUESTIONS         12       //2   
 
#define DNS_FLAGS_RESPONSE    0x8000
#define DNS_FLAGS_RECURSIVE   0x0100
#define DNS_FLAGS_ERROR       0x0003
#define DNS_FLAGS_OK          0x0000
#define DNS_QUERY_TYPE_IP     1
#define DNS_QUERY_CLASS       1
#define DNS_PORT              53
 
//TCP   FIELD                 OFFSET   LENGTH   VALUE
#define TCP_SOURCE_PORT       34       //2
#define TCP_DEST_PORT         36       //2
#define TCP_SEQ               38       //4
#define TCP_ACK               42       //4
#define TCP_HEADER_LENGTH     46       //1      0x50
#define TCP_FLAGS             47       //1      SYNC=0x2;ACK=0x10;FIN=0x1
#define TCP_WINDOW_SIZE       48       //2
#define TCP_CHECKSUM          50       //2
#define TCP_URGENT_POINTER    52       //2
#define TCP_DATA              54       //length-N
 
#define TCP_FLAGS_FIN         1
#define TCP_FLAGS_SYN         2
#define TCP_FLAGS_RST         4
#define TCP_FLAGS_PSH         8
#define TCP_FLAGS_ACK         16
 
//PING  FIELD                 OFFSET   LENGTH   VALUE
#define PING_TYPE             34       //1      SEND=8;REPLY=0
#define PING_CODE             35       //1      0
#define PING_CHECKSUM         36       //2
#define PING_ID               38       //2
#define PING_SEQUENCE         40       //2
#define PING_DATA             44
 
static void IPClose2(IPSocket *Socket);
 
static uint8 ethernetAddressNull[] =    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
static uint8 ethernetAddressGateway[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
#ifndef WIN32
static uint8 ethernetAddressPlasma[] =  {0x00, 0x10, 0xdd, 0xce, 0x15, 0xd4};
#else
static uint8 ethernetAddressPlasma[] =  {0x00, 0x10, 0xdd, 0xce, 0x15, 0xd5};
#endif
 
static uint8 ipAddressPlasma[] =  {0x9d, 0xfe, 0x28, 10};   //changed by DHCP
static uint8 ipAddressGateway[] = {0xff, 0xff, 0xff, 0xff}; //changed by DHCP
static uint32 ipAddressDns;                                 //changed by DHCP
 
static OS_Mutex_t *IPMutex;
static int FrameFreeCount;
static IPFrame *FrameFreeHead;
static IPFrame *FrameSendHead;
static IPFrame *FrameSendTail;
static IPFrame *FrameResendHead;
static IPFrame *FrameResendTail;
static IPSocket *SocketHead;
static uint32 Seconds;
static int DhcpRetrySeconds;
static IPFuncPtr FrameSendFunc;
static OS_MQueue_t *IPMQueue;
static OS_Thread_t *IPThread;
int IPVerbose=1;
 
static const unsigned char dhcpDiscover[] = {
   0xff, 0xff, 0xff, 0xff, 0xff, 0xff,             //dest
   0x00, 0x10, 0xdd, 0xce, 0x15, 0xd4,             //src
   0x08, 0x00,
   0x45, 0x00, 0x01, 0x48, 0x2e, 0xf5, 0x00, 0x00, //ip
   0x80, 0x11, 0x0a, 0xb1, 0x00, 0x00, 0x00, 0x00,
   0xff, 0xff, 0xff, 0xff,
   0x00, 0x44, 0x00, 0x43, 0x01, 0x34, 0x45, 0x66, //udp
   0x01, 0x01, 0x06, 0x00, 0x69, 0x26, 0xb5, 0x52  //dhcp
};
 
static unsigned char dhcpOptions[] = {
   0x63, 0x82, 0x53, 0x63,      //cookie
   0x35, 0x01, 0x01,            //DHCP Discover
   0x3d, 0x07, 0x01, 0x00, 0x10, 0xdd, 0xce, 0x15, 0xd4, //Client identifier
#ifndef WIN32
   0x0c, 0x06, 'p', 'l', 'a', 's', 'm', 'a',             //Host name
#else
   0x0c, 0x06, 'p', 'l', 'a', 's', 'm', 'b',             //Host name
#endif
   0x37, 0x03, DHCP_PARAM_SUBNET, DHCP_PARAM_ROUTER, DHCP_PARAM_DNS, //Parameters
   DHCP_END_OPTION
};
 
 
//Get a free frame; can be called from an ISR
IPFrame *IPFrameGet(int freeCount)
{
   IPFrame *frame=NULL;
   uint32 state;
 
   state = OS_CriticalBegin();
   if(FrameFreeCount > freeCount)
   {
      frame = FrameFreeHead;
      if(FrameFreeHead)
      {
         FrameFreeHead = FrameFreeHead->next;
         --FrameFreeCount;
      }
   }
   OS_CriticalEnd(state);
   if(frame)
   {
      assert(frame->state == 0);
      frame->state = 1;
   }
   return frame;
}
 
 
static void FrameFree(IPFrame *frame)
{
   uint32 state;
 
   assert(frame->state == 1);
   frame->state = 0;
   state = OS_CriticalBegin();
   frame->next = FrameFreeHead;
   FrameFreeHead = frame;
   ++FrameFreeCount;
   OS_CriticalEnd(state);
}
 
 
static void FrameInsert(IPFrame **head, IPFrame **tail, IPFrame *frame)
{
   assert(frame->state == 1);
   frame->state = 2;
   OS_MutexPend(IPMutex);
   frame->prev = NULL;
   frame->next = *head;
   if(*head)
      (*head)->prev = frame;
   *head = frame;
   if(*tail == NULL)
      *tail = frame;
   OS_MutexPost(IPMutex);
}
 
 
static void FrameRemove(IPFrame **head, IPFrame **tail, IPFrame *frame)
{
   assert(frame->state == 2);
   frame->state = 1;
   if(frame->prev)
      frame->prev->next = frame->next;
   else
      *head = frame->next;
   if(frame->next)
      frame->next->prev = frame->prev;
   else
      *tail = frame->prev;
   frame->prev = NULL;
   frame->next = NULL;
}
 
 
static int IPChecksum(int checksum, const unsigned char *data, int length)
{
   int i;
   checksum = ~checksum & 0xffff;
   for(i = 0; i < length-1; i += 2)
   {
      checksum += (data[i] << 8) | data[i+1];
   }
   if(i < length)
      checksum += data[i] << 8;
   while(checksum >> 16)
      checksum = (checksum & 0xffff) + (checksum >> 16);
   checksum = ~checksum & 0xffff;
   return checksum;
}
 
 
static int EthernetVerifyChecksums(const unsigned char *packet, int length)
{
   int checksum, length2;
   unsigned char pseudo[12];
 
   //Calculate checksums
   if(packet[ETHERNET_FRAME_TYPE+1] == 0x00)  //IP
   {
      checksum = IPChecksum(0xffff, packet+IP_VERSION_LENGTH, 20);
      if(checksum)
         return -1;
      if(packet[IP_PROTOCOL] == 0x01)         //PING
      {
         checksum = IPChecksum(0xffff, packet+PING_TYPE, length-PING_TYPE);
      }
      else if(packet[IP_PROTOCOL] == 0x11)    //UDP
      {
         if(packet[UDP_CHECKSUM] == 0 && packet[UDP_CHECKSUM+1] == 0)
            return 0;
         memcpy(pseudo+PSEUDO_IP_SOURCE, packet+IP_SOURCE, 4);
         memcpy(pseudo+PSEUDO_IP_DEST, packet+IP_DEST, 4);
         pseudo[PSEUDO_ZERO] = 0;
         pseudo[PSEUDO_IP_PROTOCOL] = packet[IP_PROTOCOL];
         memcpy(pseudo+PSEUDO_LENGTH, packet+UDP_LENGTH, 2);
         checksum = IPChecksum(0xffff, pseudo, 12);
         length2 = (packet[UDP_LENGTH] << 8) + packet[UDP_LENGTH+1];
         checksum = IPChecksum(checksum, packet+UDP_SOURCE_PORT, length);
      }
      else if(packet[IP_PROTOCOL] == 0x06)    //TCP
      {
         memcpy(pseudo+PSEUDO_IP_SOURCE, packet+IP_SOURCE, 4);
         memcpy(pseudo+PSEUDO_IP_DEST, packet+IP_DEST, 4);
         pseudo[PSEUDO_ZERO] = 0;
         pseudo[PSEUDO_IP_PROTOCOL] = packet[IP_PROTOCOL];
         length = (packet[IP_LENGTH] << 8) + packet[IP_LENGTH+1];
         length2 = length - 20;
         pseudo[PSEUDO_LENGTH] = (unsigned char)(length2 >> 8);
         pseudo[PSEUDO_LENGTH+1] = (unsigned char)length2;
         checksum = IPChecksum(0xffff, pseudo, 12);
         checksum = IPChecksum(checksum, packet+TCP_SOURCE_PORT, length2);
      }
      if(checksum)
         return -1;
   }
   return 0;
}
 
 
static void IPFrameReschedule(IPFrame *frame)
{
   int length;
   length = frame->length - TCP_DATA;
   if(frame->packet[TCP_FLAGS] & (TCP_FLAGS_FIN | TCP_FLAGS_SYN))
      ++length;
   if(frame->socket == NULL || frame->socket->state == IP_UDP || length == 0 ||
      frame->socket->state == IP_PING || ++frame->retryCnt > 4)
   {
      FrameFree(frame);     //can't be ACK'ed
   }
   else
   {
      //Put on resend list until TCP ACK'ed
      frame->timeout = (short)(RETRANSMIT_TIME * frame->retryCnt);
      FrameInsert(&FrameResendHead, &FrameResendTail, frame);
   }
}
 
 
static void IPSendFrame(IPFrame *frame)
{
   uint32 message[4];
 
   if(FrameSendFunc)
   {
      //Single threaded
      FrameSendFunc(frame->packet, frame->length);
      IPFrameReschedule(frame);
   }
   else
   {
      //Add Packet to send queue
      FrameInsert(&FrameSendHead, &FrameSendTail, frame);
 
      //Wakeup sender thread
      message[0] = 2;
      OS_MQueueSend(IPMQueue, message);
   }
}
 
 
static void IPSendPacket(IPSocket *socket, IPFrame *frame, int length)
{
   int checksum, length2=length;
   unsigned char pseudo[12], *packet=frame->packet;
 
   frame->length = (uint16)length;
 
   //Calculate checksums
   if(packet[ETHERNET_FRAME_TYPE+1] == 0x00)  //IP
   {
      length2 = length - IP_VERSION_LENGTH;
      packet[IP_LENGTH] = (uint8)(length2 >> 8);
      packet[IP_LENGTH+1] = (uint8)length2;
      memset(packet+IP_CHECKSUM, 0, 2);
      checksum = IPChecksum(0xffff, packet+IP_VERSION_LENGTH, 20);
      packet[IP_CHECKSUM] = (unsigned char)(checksum >> 8);
      packet[IP_CHECKSUM+1] = (unsigned char)checksum;
      if(packet[IP_PROTOCOL] == 0x01)         //ICMP & PING
      {
         memset(packet+PING_CHECKSUM, 0, 2);
         checksum = IPChecksum(0xffff, packet+PING_TYPE, length-PING_TYPE);
         packet[PING_CHECKSUM] = (unsigned char)(checksum >> 8);
         packet[PING_CHECKSUM+1] = (unsigned char)checksum;
      }
      else if(packet[IP_PROTOCOL] == 0x11)    //UDP
      {
         length2 = length - UDP_SOURCE_PORT;
         packet[UDP_LENGTH] = (uint8)(length2 >> 8);
         packet[UDP_LENGTH+1] = (uint8)length2;
         memcpy(pseudo+PSEUDO_IP_SOURCE, packet+IP_SOURCE, 4);
         memcpy(pseudo+PSEUDO_IP_DEST, packet+IP_DEST, 4);
         pseudo[PSEUDO_ZERO] = 0;
         pseudo[PSEUDO_IP_PROTOCOL] = packet[IP_PROTOCOL];
         memcpy(pseudo+PSEUDO_LENGTH, packet+UDP_LENGTH, 2);
         checksum = IPChecksum(0xffff, pseudo, 12);
         memset(packet+UDP_CHECKSUM, 0, 2);
         length2 = (packet[UDP_LENGTH] << 8) + packet[UDP_LENGTH+1];
         checksum = IPChecksum(checksum, packet+UDP_SOURCE_PORT, length2);
         packet[UDP_CHECKSUM] = (unsigned char)(checksum >> 8);
         packet[UDP_CHECKSUM+1] = (unsigned char)checksum;
      }
      else if(packet[IP_PROTOCOL] == 0x06)    //TCP
      {
         memcpy(pseudo+PSEUDO_IP_SOURCE, packet+IP_SOURCE, 4);
         memcpy(pseudo+PSEUDO_IP_DEST, packet+IP_DEST, 4);
         pseudo[PSEUDO_ZERO] = 0;
         pseudo[PSEUDO_IP_PROTOCOL] = packet[IP_PROTOCOL];
         length2 = (packet[IP_LENGTH] << 8) + packet[IP_LENGTH+1];
         length2 = length2 - 20;
         pseudo[PSEUDO_LENGTH] = (unsigned char)(length2 >> 8);
         pseudo[PSEUDO_LENGTH+1] = (unsigned char)length2;
         checksum = IPChecksum(0xffff, pseudo, 12);
         memset(packet+TCP_CHECKSUM, 0, 2);
         checksum = IPChecksum(checksum, packet+TCP_SOURCE_PORT, length2);
         packet[TCP_CHECKSUM] = (unsigned char)(checksum >> 8);
         packet[TCP_CHECKSUM+1] = (unsigned char)checksum;
      }
   }
 
   length2 = length - TCP_DATA;
   if(socket && (packet[TCP_FLAGS] & (TCP_FLAGS_FIN | TCP_FLAGS_SYN)))
      length2 = 1;
   frame->socket = socket;
   frame->timeout = 0;
   frame->retryCnt = 0;
   if(socket)
      frame->seqEnd = socket->seq + length2;
   IPSendFrame(frame);
}
 
 
static void TCPSendPacket(IPSocket *socket, IPFrame *frame, int length)
{
   uint8 *packet = frame->packet;
   int flags, count;
 
   flags = packet[TCP_FLAGS];
   memcpy(packet, socket->headerSend, TCP_SEQ);
   packet[TCP_FLAGS] = (uint8)flags;
   if(flags & TCP_FLAGS_SYN)
      packet[TCP_HEADER_LENGTH] = 0x60;  //set maximum segment size
   else
      packet[TCP_HEADER_LENGTH] = 0x50;
   packet[TCP_SEQ]   = (uint8)(socket->seq >> 24);
   packet[TCP_SEQ+1] = (uint8)(socket->seq >> 16);
   packet[TCP_SEQ+2] = (uint8)(socket->seq >> 8);
   packet[TCP_SEQ+3] = (uint8)socket->seq;
   packet[TCP_ACK]   = (uint8)(socket->ack >> 24);
   packet[TCP_ACK+1] = (uint8)(socket->ack >> 16);
   packet[TCP_ACK+2] = (uint8)(socket->ack >> 8);
   packet[TCP_ACK+3] = (uint8)socket->ack;
   count = RECEIVE_WINDOW - (socket->ack - socket->ackProcessed);
   if(count < 0)
      count = 0;
   packet[TCP_WINDOW_SIZE] = (uint8)(count >> 8);
   packet[TCP_WINDOW_SIZE+1] = (uint8)count;
   packet[TCP_URGENT_POINTER] = 0;
   packet[TCP_URGENT_POINTER+1] = 0;
   IPSendPacket(socket, frame, length);
}
 
 
static void EthernetCreateResponse(unsigned char *packetOut,
                                   const unsigned char *packet,
                                   int length)
{
   //Swap destination and source fields
   memcpy(packetOut, packet, length);
   memcpy(packetOut+ETHERNET_DEST, packet+ETHERNET_SOURCE, 6);
   memcpy(packetOut+ETHERNET_SOURCE, packet+ETHERNET_DEST, 6);
   if(packet[ETHERNET_FRAME_TYPE+1] == 0x00)  //IP
   {
      memcpy(packetOut+IP_SOURCE, packet+IP_DEST, 4);
      memcpy(packetOut+IP_DEST, packet+IP_SOURCE, 4);
      if(packet[IP_PROTOCOL] == 0x06 || packet[IP_PROTOCOL] == 0x11)   //TCP/UDP
      {
         memcpy(packetOut+TCP_SOURCE_PORT, packet+TCP_DEST_PORT, 2);
         memcpy(packetOut+TCP_DEST_PORT, packet+TCP_SOURCE_PORT, 2);
      }
   }
}
 
 
static void IPDhcp(const unsigned char *packet, int length, int state)
{
   uint8 *packetOut, *ptr;
   const uint8 *ptr2;
   IPFrame *frame;
   static int request=0;
 
   if(state == 1)
   {
      //Create DHCP Discover
      frame = IPFrameGet(0);
      if(frame == NULL)
         return;
      packetOut = frame->packet;
      memset(packetOut, 0, 512);
      memcpy(packetOut, dhcpDiscover, sizeof(dhcpDiscover));
      memcpy(packetOut+ETHERNET_SOURCE, ethernetAddressPlasma, 6);
      memcpy(packetOut+DHCP_CLIENT_ETHERNET, ethernetAddressPlasma, 6);
      memcpy(packetOut+DHCP_MAGIC_COOKIE, dhcpOptions, sizeof(dhcpOptions));
      memcpy(packetOut+DHCP_MAGIC_COOKIE+10, ethernetAddressPlasma, 6);
      IPSendPacket(NULL, frame, 400);
      request = DHCP_DISCOVER;
      DhcpRetrySeconds = 2;
   }
   else if(state == 2 && memcmp(packet+DHCP_CLIENT_ETHERNET, ethernetAddressPlasma, 6) == 0)
   {
      if(packet[DHCP_MAGIC_COOKIE+6] == DHCP_OFFER && request == DHCP_DISCOVER)
      {
         //Process DHCP Offer and send DHCP Request
         frame = IPFrameGet(0);
         if(frame == NULL)
            return;
         packetOut = frame->packet;
         memset(packetOut, 0, 512);
         memcpy(packetOut, dhcpDiscover, sizeof(dhcpDiscover));
         memcpy(packetOut+ETHERNET_SOURCE, ethernetAddressPlasma, 6);
         memcpy(packetOut+DHCP_CLIENT_ETHERNET, ethernetAddressPlasma, 6);
         memcpy(packetOut+DHCP_MAGIC_COOKIE, dhcpOptions, sizeof(dhcpOptions));
         memcpy(packetOut+DHCP_MAGIC_COOKIE+10, ethernetAddressPlasma, 6);
         request = DHCP_REQUEST;
         packetOut[DHCP_MAGIC_COOKIE+6] = DHCP_REQUEST;
         ptr = packetOut+DHCP_MAGIC_COOKIE+sizeof(dhcpOptions)-1;
         ptr[0] = DHCP_REQUEST_IP;
         ptr[1] = 4;
         memcpy(ptr+2, packet+DHCP_YOUR_IP, 4);
         ptr[6] = DHCP_REQUEST_SERV_IP;
         ptr[7] = 4;
         memcpy(ptr+8, packet+DHCP_SERVER_IP, 4);
         ptr[12] = DHCP_END_OPTION;
         IPSendPacket(NULL, frame, 400);
      }
      else if(packet[DHCP_MAGIC_COOKIE+6] == DHCP_ACK && request == DHCP_REQUEST)
      {
         //Process DHCP Ack
         request = 0;
         DhcpRetrySeconds = 3600*4;
         memcpy(ipAddressPlasma, packet+DHCP_YOUR_IP, 4);
         printf("IP=%d.%d.%d.%d ", ipAddressPlasma[0], ipAddressPlasma[1],
            ipAddressPlasma[2], ipAddressPlasma[3]);
         memcpy(ipAddressGateway, packet+DHCP_GATEWAY_IP, 4);
         if(ipAddressGateway[0] == 0 && ipAddressGateway[1] == 0 &&
            ipAddressGateway[2] == 0 && ipAddressGateway[3] == 0)
            memcpy(ipAddressGateway, packet+DHCP_SERVER_IP, 4);
         printf("GW=%d.%d.%d.%d ", ipAddressGateway[0], ipAddressGateway[1],
            ipAddressGateway[2], ipAddressGateway[3]);
         memcpy(ethernetAddressGateway, packet+ETHERNET_SOURCE, 6);
         ptr2 = packet+DHCP_MAGIC_COOKIE+4;
         while(ptr2[0] != DHCP_END_OPTION && (int)(ptr2 - packet) < length)
         {
            if(ptr2[0] == DHCP_PARAM_DNS)
            {
               ipAddressDns = (ptr2[2] << 24) | (ptr2[3] << 16) | (ptr2[4] << 8) | ptr2[5];
               printf("DNS=%d.%d.%d.%d ", ptr2[2], ptr2[3], ptr2[4], ptr2[5]);
            }
            ptr2 += ptr2[1] + 2;
         }
 
         //Check if DHCP reply came from gateway
         if(memcmp(packet+IP_SOURCE, ipAddressGateway, 4))
         {
            //Send ARP to gateway
            frame = IPFrameGet(0);
            if(frame == NULL)
               return;
            packetOut = frame->packet;
            memset(packetOut, 0, 512);
            memset(packetOut+ETHERNET_DEST, 0xff, 6);
            memcpy(packetOut+ETHERNET_SOURCE, ethernetAddressPlasma, 6);
            packetOut[ETHERNET_FRAME_TYPE] = 0x08;
            packetOut[ETHERNET_FRAME_TYPE+1] = 0x06;
            packetOut[ARP_HARD_TYPE+1] = 0x01;
            packetOut[ARP_PROT_TYPE] = 0x08;
            packetOut[ARP_HARD_SIZE] = 0x06;
            packetOut[ARP_PROT_SIZE] = 0x04;
            packetOut[ARP_OP+1] = 1;
            memcpy(packetOut+ARP_ETHERNET_SENDER, ethernetAddressPlasma, 6);
            memcpy(packetOut+ARP_IP_SENDER, ipAddressPlasma, 4);
            memcpy(packetOut+ARP_IP_TARGET, ipAddressGateway, 4);
            IPSendPacket(NULL, frame, 60);
         }
      }
   }
}
 
 
uint32 IPAddressSelf(void)
{
   return (ipAddressPlasma[0] << 24) | (ipAddressPlasma[1] << 16) |
          (ipAddressPlasma[2] << 8) | ipAddressPlasma[3];
}
 
 
static int IPProcessTCPPacket(IPFrame *frameIn)
{
   uint32 seq, ack;
   int length, ip_length, bytes, rc=0, notify=0;
   IPSocket *socket, *socketNew;
   IPFrame *frameOut, *frame2, *framePrev;
   uint8 *packet, *packetOut;
 
   packet = frameIn->packet;
   length = frameIn->length;
 
   ip_length = (packet[IP_LENGTH] << 8) | packet[IP_LENGTH+1];
   seq = (packet[TCP_SEQ] << 24) | (packet[TCP_SEQ+1] << 16) |
         (packet[TCP_SEQ+2] << 8) | packet[TCP_SEQ+3];
   ack = (packet[TCP_ACK] << 24) | (packet[TCP_ACK+1] << 16) |
         (packet[TCP_ACK+2] << 8) | packet[TCP_ACK+3];
 
   //Check if start of connection
   if((packet[TCP_FLAGS] & (TCP_FLAGS_SYN | TCP_FLAGS_ACK)) == TCP_FLAGS_SYN)
   {
      if(IPVerbose)
         printf("S");
      //Check if duplicate SYN
      for(socket = SocketHead; socket; socket = socket->next)
      {
         if(socket->state != IP_LISTEN &&
            packet[IP_PROTOCOL] == socket->headerRcv[IP_PROTOCOL] &&
            memcmp(packet+IP_SOURCE, socket->headerRcv+IP_SOURCE, 8) == 0 &&
            memcmp(packet+TCP_SOURCE_PORT, socket->headerRcv+TCP_SOURCE_PORT, 4) == 0)
         {
            if(IPVerbose)
               printf("s");
            return 0;
         }
      }
 
      //Find an open port
      for(socket = SocketHead; socket; socket = socket->next)
      {
         if(socket->state == IP_LISTEN &&
            packet[IP_PROTOCOL] == socket->headerRcv[IP_PROTOCOL] &&
            memcmp(packet+TCP_DEST_PORT, socket->headerRcv+TCP_DEST_PORT, 2) == 0)
         {
            //Create a new socket
            frameOut = IPFrameGet(FRAME_COUNT_SYNC);
            if(frameOut == NULL)
               return 0;
            socketNew = (IPSocket*)malloc(sizeof(IPSocket));
            if(socketNew == NULL)
               return 0;
            memcpy(socketNew, socket, sizeof(IPSocket));
            socketNew->state = IP_TCP;
            socketNew->timeout = SOCKET_TIMEOUT;
            socketNew->ack = seq;
            socketNew->ackProcessed = seq + 1;
            socketNew->seq = socketNew->ack + 0x12345678;
            socketNew->seqReceived = socketNew->seq;
            socketNew->seqWindow = (packet[TCP_WINDOW_SIZE] << 8) | packet[TCP_WINDOW_SIZE+1];
 
            //Send ACK
            packetOut = frameOut->packet;
            EthernetCreateResponse(packetOut, packet, length);
            memcpy(socketNew->headerRcv, packet, TCP_SEQ);
            memcpy(socketNew->headerSend, packetOut, TCP_SEQ);
            packetOut[TCP_FLAGS] = TCP_FLAGS_SYN | TCP_FLAGS_ACK;
            ++socketNew->ack;
            packetOut[TCP_DATA] = 2;    //maximum segment size = 536
            packetOut[TCP_DATA+1] = 4;
            packetOut[TCP_DATA+2] = 2;
            packetOut[TCP_DATA+3] = 24;
            TCPSendPacket(socketNew, frameOut, TCP_DATA+4);
            ++socketNew->seq;
 
            //Add socket to linked list
            OS_MutexPend(IPMutex);
            socketNew->next = SocketHead;
            socketNew->prev = NULL;
            if(SocketHead)
               SocketHead->prev = socketNew;
            SocketHead = socketNew;
            OS_MutexPost(IPMutex);
            if(socketNew->funcPtr)
               OS_Job(socketNew->funcPtr, socketNew, 0, 0);
            return 0;
         }
      }
 
      //Send reset
      frameOut = IPFrameGet(0);
      if(frameOut == NULL)
         return 0;
      packetOut = frameOut->packet;
      EthernetCreateResponse(packetOut, packet, TCP_DATA);
      memset(packetOut+TCP_SEQ, 0, 4);
      ++seq;
      packetOut[TCP_ACK]   = (uint8)(seq >> 24);
      packetOut[TCP_ACK+1] = (uint8)(seq >> 16);
      packetOut[TCP_ACK+2] = (uint8)(seq >> 8);
      packetOut[TCP_ACK+3] = (uint8)seq;
      packetOut[TCP_HEADER_LENGTH] = 0x50;
      packetOut[TCP_FLAGS] = TCP_FLAGS_RST;
      IPSendPacket(NULL, frameOut, TCP_DATA);
      return 0;
   }
 
   //Find an open socket
   for(socket = SocketHead; socket; socket = socket->next)
   {
      if(packet[IP_PROTOCOL] == socket->headerRcv[IP_PROTOCOL] &&
         memcmp(packet+IP_SOURCE, socket->headerRcv+IP_SOURCE, 8) == 0 &&
         memcmp(packet+TCP_SOURCE_PORT, socket->headerRcv+TCP_SOURCE_PORT, 4) == 0)
      {
         break;
      }
   }
   if(socket == NULL)
   {
      return 0;
   }
 
   //Determine window
   socket->seqWindow = (packet[TCP_WINDOW_SIZE] << 8) | packet[TCP_WINDOW_SIZE+1];
   bytes = ip_length - (TCP_DATA - IP_VERSION_LENGTH);
 
   //Check if packets can be removed from retransmition list
   if(packet[TCP_FLAGS] & TCP_FLAGS_ACK)
   {
      if(ack != socket->seqReceived)
      {
         OS_MutexPend(IPMutex);
         for(frame2 = FrameResendHead; frame2; )
         {
            framePrev = frame2;
            frame2 = frame2->next;
            if(framePrev->socket == socket && (int)(ack - framePrev->seqEnd) >= 0)
            {
               //Remove packet from retransmition queue
               if(socket->timeout)
                  socket->timeout = socket->timeoutReset;
               FrameRemove(&FrameResendHead, &FrameResendTail, framePrev);
               FrameFree(framePrev);
            }
         }
         OS_MutexPost(IPMutex);
         socket->seqReceived = ack;
         socket->resentDone = 0;
      }
      else if(ack == socket->seqReceived && bytes == 0 &&
         (packet[TCP_FLAGS] & (TCP_FLAGS_RST | TCP_FLAGS_FIN)) == 0 &&
         socket->resentDone == 0)
      {
         //Detected that packet was lost, resend all
         if(IPVerbose)
            printf("A");
         OS_MutexPend(IPMutex);
         for(frame2 = FrameResendHead; frame2; )
         {
            framePrev = frame2;
            frame2 = frame2->next;
            if(framePrev->socket == socket)
            {
               //Remove packet from retransmition queue
               FrameRemove(&FrameResendHead, &FrameResendTail, framePrev);
               IPSendFrame(framePrev);
            }
         }
         OS_MutexPost(IPMutex);
         socket->resentDone = 1;
      }
   }
 
   //Check if SYN/ACK
   if((packet[TCP_FLAGS] & (TCP_FLAGS_SYN | TCP_FLAGS_ACK)) ==
      (TCP_FLAGS_SYN | TCP_FLAGS_ACK))
   {
      //Ack SYN/ACK
      socket->ack = seq + 1;
      socket->ackProcessed = seq + 1;
      frameOut = IPFrameGet(FRAME_COUNT_SEND);
      if(frameOut)
      {
         frameOut->packet[TCP_FLAGS] = TCP_FLAGS_ACK;
         TCPSendPacket(socket, frameOut, TCP_DATA);
      }
      if(socket->funcPtr)
         OS_Job(socket->funcPtr, socket, 0, 0);
      return 0;
   }
   if(packet[TCP_HEADER_LENGTH] != 0x50)
   {
      if(IPVerbose)
         printf("length error\n");
      return 0;
   }
 
   //Check if RST flag set
   if(packet[TCP_FLAGS] & TCP_FLAGS_RST)
   {
      notify = 1;
      if(socket->state == IP_FIN_SERVER)
         IPClose2(socket);
      else if(socket->state == IP_TCP)
         socket->state = IP_FIN_CLIENT;
   }
   //Copy packet into socket
   else if(socket->ack == seq && bytes > 0)
   {
      //Insert packet into socket linked list
      notify = 1;
      if(socket->timeout)
         socket->timeout = socket->timeoutReset;
      if(IPVerbose)
         printf("D");
      if(frameIn->length > ip_length + IP_VERSION_LENGTH)
         frameIn->length = (uint16)(ip_length + IP_VERSION_LENGTH);
      FrameInsert(&socket->frameReadHead, &socket->frameReadTail, frameIn);
      socket->ack += bytes;
 
      //Ack data
      frameOut = IPFrameGet(FRAME_COUNT_SEND);
      if(frameOut)
      {
         frameOut->packet[TCP_FLAGS] = TCP_FLAGS_ACK;
         TCPSendPacket(socket, frameOut, TCP_DATA);
      }
 
      //Using frame
      rc = 1;
   }
   else if(bytes)
   {
      //Ack with current offset since data missing
      frameOut = IPFrameGet(FRAME_COUNT_SEND);
      if(frameOut)
      {
         frameOut->packet[TCP_FLAGS] = TCP_FLAGS_ACK;
         TCPSendPacket(socket, frameOut, TCP_DATA);
      }
   }
 
   //Check if FIN flag set
   if(packet[TCP_FLAGS] & TCP_FLAGS_FIN)
   {
      notify = 1;
      socket->timeout = SOCKET_TIMEOUT;
      if(IPVerbose)
         printf("F");
      frameOut = IPFrameGet(0);
      if(frameOut == NULL)
         return 0;
      packetOut = frameOut->packet;
      packetOut[TCP_FLAGS] = TCP_FLAGS_ACK;
      ++socket->ack;
      TCPSendPacket(socket, frameOut, TCP_DATA);
      if(socket->state == IP_FIN_SERVER)
         IPClose2(socket);
      else if(socket->state == IP_TCP)
         socket->state = IP_FIN_CLIENT;
   }
 
   //Notify application
   if(socket->funcPtr && notify)
      OS_Job(socket->funcPtr, socket, 0, 0);
   return rc;
}
 
 
int IPProcessEthernetPacket(IPFrame *frameIn, int length)
{
   int ip_length, rc;
   IPSocket *socket;
   IPFrame *frameOut;
   uint8 *packet, *packetOut;
 
   packet = frameIn->packet;
   frameIn->length = (uint16)length;
 
   if(packet[ETHERNET_FRAME_TYPE] != 0x08 || frameIn->length > PACKET_SIZE)
      return 0;  //wrong ethernet type, packet not used
 
   //ARP?
   if(packet[ETHERNET_FRAME_TYPE+1] == 0x06)
   {
      //Check if ARP reply
      if(memcmp(packet+ETHERNET_DEST, ethernetAddressPlasma, 6) == 0 &&
         packet[ARP_OP+1] == 2 && memcmp(packet+ARP_IP_SENDER, ipAddressGateway, 4) == 0)
      {
         //Found MAC address for gateway
         memcpy(ethernetAddressGateway, packet+ARP_ETHERNET_SENDER, 6);
         return 0;
      }
 
      //Check if ARP request
      if(memcmp(packet+ETHERNET_DEST, ethernetAddressNull, 6) ||
         packet[ARP_OP] != 0 || packet[ARP_OP+1] != 1 ||
         memcmp(packet+ARP_IP_TARGET, ipAddressPlasma, 4))
         return 0;
      //Create ARP response
      frameOut = IPFrameGet(0);
      if(frameOut == NULL)
         return 0;
      packetOut = frameOut->packet;
      memcpy(packetOut, packet, frameIn->length);
      memcpy(packetOut+ETHERNET_DEST, packet+ETHERNET_SOURCE, 6);
      memcpy(packetOut+ETHERNET_SOURCE, ethernetAddressPlasma, 6);
      packetOut[ARP_OP+1] = 2; //ARP reply
      memcpy(packetOut+ARP_ETHERNET_SENDER, ethernetAddressPlasma, 6);
      memcpy(packetOut+ARP_IP_SENDER, packet+ARP_IP_TARGET, 4);
      memcpy(packetOut+ARP_ETHERNET_TARGET, packet+ARP_ETHERNET_SENDER, 6);
      memcpy(packetOut+ARP_IP_TARGET, packet+ARP_IP_SENDER, 4);
      IPSendPacket(NULL, frameOut, frameIn->length);
      return 0;
   }
 
   //Check if proper type of packet
   ip_length = (packet[IP_LENGTH] << 8) | packet[IP_LENGTH+1];
   if(frameIn->length < UDP_DATA || ip_length > frameIn->length - IP_VERSION_LENGTH)
      return 0;
   if(packet[ETHERNET_FRAME_TYPE+1] != 0x00 ||
      packet[IP_VERSION_LENGTH] != 0x45)
      return 0;
 
   //Check if DHCP reply
   if(packet[IP_PROTOCOL] == 0x11 &&
      packet[UDP_SOURCE_PORT] == 0 && packet[UDP_SOURCE_PORT+1] == 67 &&
      packet[UDP_DEST_PORT] == 0 && packet[UDP_DEST_PORT+1] == 68)
   {
      IPDhcp(packet, frameIn->length, 2);            //DHCP reply
      return 0;
   }
 
   //Check if correct destination address
   if(memcmp(packet+ETHERNET_DEST, ethernetAddressPlasma, 6) ||
      memcmp(packet+IP_DEST, ipAddressPlasma, 4))
      return 0;
   rc = EthernetVerifyChecksums(packet, frameIn->length);
   //if(rc)
   //{
   //   printf("C ");
   //   return;
   //}
 
   //PING request?
   if(packet[IP_PROTOCOL] == 1)
   {
      if(packet[PING_TYPE] == 0)  //PING reply
      {
         for(socket = SocketHead; socket; socket = socket->next)
         {
            if(socket->state == IP_PING &&
               memcmp(packet+IP_SOURCE, socket->headerSend+IP_DEST, 4) == 0)
            {
               OS_Job(socket->funcPtr, socket, 0, 0);
               return 0;
            }
         }
      }
      if(packet[PING_TYPE] != 8)
         return 0;
      frameOut = IPFrameGet(FRAME_COUNT_SEND);
      if(frameOut == NULL)
         return 0;
      packetOut = frameOut->packet;
      EthernetCreateResponse(packetOut, packet, frameIn->length);
      frameOut->packet[PING_TYPE] = 0;       //PING reply
      IPSendPacket(NULL, frameOut, frameIn->length);
      return 0;
   }
 
   //TCP packet?
   if(packet[IP_PROTOCOL] == 0x06)
   {
      return IPProcessTCPPacket(frameIn);
   }
 
   //UDP packet?
   if(packet[IP_PROTOCOL] == 0x11)
   {
      //Find open socket
      for(socket = SocketHead; socket; socket = socket->next)
      {
         if(packet[IP_PROTOCOL] == socket->headerRcv[IP_PROTOCOL] &&
            memcmp(packet+IP_SOURCE, socket->headerRcv+IP_SOURCE, 8) == 0 &&
            memcmp(packet+UDP_SOURCE_PORT, socket->headerRcv+UDP_SOURCE_PORT, 2) == 0)
         {
            break;
         }
      }
 
      if(socket == NULL)
      {
         //Find listening socket
         for(socket = SocketHead; socket; socket = socket->next)
         {
            if(packet[IP_PROTOCOL] == socket->headerRcv[IP_PROTOCOL] &&
               memcmp(packet+UDP_DEST_PORT, socket->headerRcv+UDP_DEST_PORT, 2) == 0)
            {
               EthernetCreateResponse(socket->headerSend, packet, UDP_DATA);
               break;
            }
         }
      }
 
      if(socket)
      {
         if(IPVerbose)
            printf("U");
         FrameInsert(&socket->frameReadHead, &socket->frameReadTail, frameIn);
         OS_Job(socket->funcPtr, socket, 0, 0);
         return 1;
      }
   }
   return 0;
}
 
 
#ifndef WIN32
static void IPMainThread(void *arg)
{
   uint32 message[4];
   int rc;
   IPFrame *frame, *frameOut=NULL;
   uint32 ticks, ticksLast;
   (void)arg;
 
   ticksLast = OS_ThreadTime();
   memset(message, 0, sizeof(message));
 
   for(;;)
   {
      Led(0);
      rc = OS_MQueueGet(IPMQueue, message, 10);
      if(rc == 0)
      {
         frame = (IPFrame*)message[1];
         if(message[0] == 0)       //frame received
         {
            Led(1);
            frame->length = (uint16)message[2];
            rc = IPProcessEthernetPacket(frame, frame->length);
            if(rc == 0)
               FrameFree(frame);
         }
         else if(message[0] == 1)  //frame sent
         {
            Led(2);
            assert(frame == frameOut);
            IPFrameReschedule(frame);
            frameOut = NULL;
         }
         else if(message[0] == 2)  //frame ready to send
         {
         }
      }
 
      if(frameOut == NULL)
      {
         OS_MutexPend(IPMutex);
         frameOut = FrameSendTail;
         if(frameOut)
            FrameRemove(&FrameSendHead, &FrameSendTail, frameOut);
         OS_MutexPost(IPMutex);
         if(frameOut)
         {
            Led(4);
            UartPacketSend(frameOut->packet, frameOut->length);
         }
      }
 
      ticks = OS_ThreadTime();
      if(ticks - ticksLast > 100)
      {
         IPTick();
         ticksLast = ticks;
      }
   }
}
#endif
 
 
uint8 *MyPacketGet(void)
{
   return (uint8*)IPFrameGet(FRAME_COUNT_RCV);
}
 
 
//Set FrameSendFunction only if single threaded
void IPInit(IPFuncPtr frameSendFunction, uint8 macAddress[6], char name[6])
{
   int i;
   IPFrame *frame;
 
   if(macAddress)
      memcpy(ethernetAddressPlasma, macAddress, 6);
   if(name)
      memcpy(dhcpOptions+18, name, 6);
   FrameSendFunc = frameSendFunction;
   IPMutex = OS_MutexCreate("IPSem");
   IPMQueue = OS_MQueueCreate("IPMQ", FRAME_COUNT*2, 32);
   for(i = 0; i < FRAME_COUNT; ++i)
   {
      frame = (IPFrame*)malloc(sizeof(IPFrame));
      memset(frame, 0, sizeof(IPFrame));
      frame->next = FrameFreeHead;
      frame->prev = NULL;
      FrameFreeHead = frame;
   }
   FrameFreeCount = FRAME_COUNT;
#ifndef WIN32
   UartPacketConfig(MyPacketGet, PACKET_SIZE, IPMQueue);
   if(frameSendFunction == NULL)
      IPThread = OS_ThreadCreate("TCP/IP", IPMainThread, NULL, 240, 6000);
#endif
   IPDhcp(NULL, 360, 1);        //Send DHCP request
}
 
 
//To open a socket for listen set ipAddress to 0
IPSocket *IPOpen(IPMode_e mode, uint32 ipAddress, uint32 port, IPFuncPtr funcPtr)
{
   IPSocket *socket;
   uint8 *ptrSend, *ptrRcv;
   IPFrame *frame;
   static int portSource=0x1007;
 
   socket = (IPSocket*)malloc(sizeof(IPSocket));
   if(socket == NULL)
      return socket;
   memset(socket, 0, sizeof(IPSocket));
   socket->prev = NULL;
   socket->state = IP_LISTEN;
   socket->timeout = 0;
   socket->timeoutReset = SOCKET_TIMEOUT;
   socket->frameReadHead = NULL;
   socket->frameReadTail = NULL;
   socket->readOffset = 0;
   socket->funcPtr = funcPtr;
   socket->userData = 0;
   socket->userFunc = NULL;
   socket->userPtr = NULL;
   socket->seqWindow = 2048;
   ptrSend = socket->headerSend;
   ptrRcv = socket->headerRcv;
 
   if(ipAddress == 0)
   {
      //Setup listing port
      socket->headerRcv[TCP_DEST_PORT] = (uint8)(port >> 8);
      socket->headerRcv[TCP_DEST_PORT+1] = (uint8)port;
   }
   else
   {
      //Setup sending packet
      memset(ptrSend, 0, UDP_LENGTH);
      memset(ptrRcv, 0, UDP_LENGTH);
 
      //Setup Ethernet
      if(ipAddress != IPAddressSelf())
         memcpy(ptrSend+ETHERNET_DEST, ethernetAddressGateway, 6);
      else
         memcpy(ptrSend+ETHERNET_DEST, ethernetAddressPlasma, 6);
      memcpy(ptrSend+ETHERNET_SOURCE, ethernetAddressPlasma, 6);
      ptrSend[ETHERNET_FRAME_TYPE] = 0x08;
 
      //Setup IP
      ptrSend[IP_VERSION_LENGTH] = 0x45;
      ptrSend[IP_TIME_TO_LIVE] = 0x80;
 
      //Setup IP addresses
      memcpy(ptrSend+IP_SOURCE, ipAddressPlasma, 4);
      ptrSend[IP_DEST] = (uint8)(ipAddress >> 24);
      ptrSend[IP_DEST+1] = (uint8)(ipAddress >> 16);
      ptrSend[IP_DEST+2] = (uint8)(ipAddress >> 8);
      ptrSend[IP_DEST+3] = (uint8)ipAddress;
      ptrRcv[IP_SOURCE] = (uint8)(ipAddress >> 24);
      ptrRcv[IP_SOURCE+1] = (uint8)(ipAddress >> 16);
      ptrRcv[IP_SOURCE+2] = (uint8)(ipAddress >> 8);
      ptrRcv[IP_SOURCE+3] = (uint8)ipAddress;
      memcpy(ptrRcv+IP_DEST, ipAddressPlasma, 4);
 
      //Setup ports
      ptrSend[TCP_SOURCE_PORT] = (uint8)(portSource >> 8);
      ptrSend[TCP_SOURCE_PORT+1] = (uint8)portSource;
      ptrSend[TCP_DEST_PORT] = (uint8)(port >> 8);
      ptrSend[TCP_DEST_PORT+1] = (uint8)port;
      ptrRcv[TCP_SOURCE_PORT] = (uint8)(port >> 8);
      ptrRcv[TCP_SOURCE_PORT+1] = (uint8)port;
      ptrRcv[TCP_DEST_PORT] = (uint8)(portSource >> 8);
      ptrRcv[TCP_DEST_PORT+1] = (uint8)portSource;
      ++portSource;
   }
 
   if(mode == IP_MODE_TCP)
   {
      if(ipAddress)
         socket->state = IP_TCP;
      else
         socket->state = IP_LISTEN;
      ptrSend[IP_PROTOCOL] = 0x06;  //TCP
      ptrRcv[IP_PROTOCOL] = 0x06;
   }
   else if(mode == IP_MODE_UDP)
   {
      socket->state = IP_UDP;
      ptrSend[IP_PROTOCOL] = 0x11;  //UDP
      ptrRcv[IP_PROTOCOL] = 0x11;
   }
   else if(mode == IP_MODE_PING)
   {
      socket->state = IP_PING;
      ptrSend[IP_PROTOCOL] = 0x01;  //PING
      memset(ptrSend+PING_TYPE, 0, 8);
      ptrSend[PING_TYPE] = 8;       //SEND
   }
 
   //Add socket to linked list
   OS_MutexPend(IPMutex);
   socket->next = SocketHead;
   socket->prev = NULL;
   if(SocketHead)
      SocketHead->prev = socket;
   SocketHead = socket;
   OS_MutexPost(IPMutex);
 
   if(mode == IP_MODE_TCP && ipAddress)
   {
      //Send TCP SYN
      socket->seq = 0x01234567;
      frame = IPFrameGet(0);
      if(frame)
      {
         frame->packet[TCP_FLAGS] = TCP_FLAGS_SYN;
         frame->packet[TCP_DATA] = 2;    //maximum segment size = 536
         frame->packet[TCP_DATA+1] = 4;
         frame->packet[TCP_DATA+2] = 2;
         frame->packet[TCP_DATA+3] = 24;
         TCPSendPacket(socket, frame, TCP_DATA+4);
         ++socket->seq;
      }
   }
   return socket;
}
 
 
void IPWriteFlush(IPSocket *socket)
{
   uint8 *packetOut;
   if(socket->frameSend && socket->state != IP_UDP &&
      socket->state != IP_PING)
   {
      packetOut = socket->frameSend->packet;
      packetOut[TCP_FLAGS] = TCP_FLAGS_ACK | TCP_FLAGS_PSH;
      TCPSendPacket(socket, socket->frameSend, TCP_DATA + socket->sendOffset);
      socket->seq += socket->sendOffset;
      socket->frameSend = NULL;
      socket->sendOffset = 0;
   }
}
 
 
uint32 IPWrite(IPSocket *socket, const uint8 *buf, uint32 length)
{
   IPFrame *frameOut;
   uint8 *packetOut;
   uint32 bytes, count=0, tries=0;
   int offset;
   OS_Thread_t *self;
 
   if(socket->timeout)
      socket->timeout = socket->timeoutReset;
 
   //printf("IPWrite(0x%x, %d)", Socket, Length);
   self = OS_ThreadSelf();
   while(length)
   {
      //Rate limit output
      if(socket->seq - socket->seqReceived >= SEND_WINDOW)
      {
         //printf("l(%d,%d,%d) ", socket->seq - socket->seqReceived, socket->seq, socket->seqReceived);
         if(self == IPThread || ++tries > 200)
            break;
         else
         {
            OS_ThreadSleep(1);
            continue;
         }
      }
      tries = 0;
      while(socket->frameSend == NULL)
      {
         socket->frameSend = IPFrameGet(FRAME_COUNT_SEND);
         socket->sendOffset = 0;
         if(socket->frameSend == NULL)
         {
            //printf("L");
            if(self == IPThread || ++tries > 200)
               break;
            else
               OS_ThreadSleep(1);
         }
      }
      frameOut = socket->frameSend;
      offset = socket->sendOffset;
      if(frameOut == NULL)
         break;
      packetOut = frameOut->packet;
 
      if(socket->state == IP_PING)
      {
         bytes = length;
         memcpy(packetOut, socket->headerSend, PING_DATA);
         memcpy(packetOut+PING_DATA, buf, bytes);
         IPSendPacket(socket, socket->frameSend, PING_DATA + bytes);
         socket->frameSend = NULL;
      }
      else if(socket->state != IP_UDP)
      {
         bytes = 512 - offset;
         if(bytes > length)
            bytes = length;
         socket->sendOffset += bytes;
         memcpy(packetOut+TCP_DATA+offset, buf, bytes);
         if(socket->sendOffset >= 512)
            IPWriteFlush(socket);
         //if(Socket->seq - Socket->seqReceived > Socket->seqWindow)
         //{
         //   printf("W");
         //   OS_ThreadSleep(10);
         //}
      }
      else  //UDP
      {
         bytes = length;
         memcpy(packetOut+UDP_DATA+offset, buf, bytes);
         memcpy(packetOut, socket->headerSend, UDP_LENGTH);
         IPSendPacket(socket, socket->frameSend, UDP_DATA + bytes);
         socket->frameSend = NULL;
      }
      count += bytes;
      buf += bytes;
      length -= bytes;
   }
   return count;
}
 
 
uint32 IPRead(IPSocket *socket, uint8 *buf, uint32 length)
{
   IPFrame *frame, *frame2;
   int count=0, bytes, offset;
 
   if(socket->state == IP_UDP)
      offset = UDP_DATA;
   else
      offset = TCP_DATA;
 
   OS_MutexPend(IPMutex);
   for(frame = socket->frameReadTail; length && frame; )
   {
      bytes = frame->length - offset - socket->readOffset;
      if(bytes > (int)length)
         bytes = length;
      memcpy(buf, frame->packet + offset + socket->readOffset, bytes);
      buf += bytes;
      socket->readOffset += bytes;
      length -= bytes;
      count += bytes;
 
      //Check if done with packet
      frame2 = frame;
      frame = frame->prev;
      if(socket->readOffset == frame2->length - offset)
      {
         //Remove packet from socket linked list
         socket->readOffset = 0;
         FrameRemove(&socket->frameReadHead, &socket->frameReadTail, frame2);
         socket->ackProcessed += frame2->length - offset;
         if(socket->state == IP_TCP &&
            socket->ack - socket->ackProcessed > RECEIVE_WINDOW - 2048)
         {
            //Update receive window for flow control
            frame2->packet[TCP_FLAGS] = TCP_FLAGS_ACK;
            TCPSendPacket(socket, frame2, TCP_DATA);
         }
         else
            FrameFree(frame2);
      }
   }
   OS_MutexPost(IPMutex);
   return count;
}
 
 
static void IPClose2(IPSocket *socket)
{
   IPFrame *frame, *framePrev;
 
   OS_MutexPend(IPMutex);
 
   //Mark packets as don't retransmit
   for(frame = FrameSendHead; frame; frame = frame->next)
   {
      if(frame->socket == socket)
         frame->socket = NULL;
   }
 
   //Remove packets from retransmision list
   for(frame = FrameResendHead; frame; )
   {
      framePrev = frame;
      frame = frame->next;
      if(framePrev->socket == socket)
      {
         FrameRemove(&FrameResendHead, &FrameResendTail, framePrev);
         FrameFree(framePrev);
      }
   }
 
   //Remove packets from socket read linked list
   for(frame = socket->frameReadHead; frame; )
   {
      framePrev = frame;
      frame = frame->next;
      FrameRemove(&socket->frameReadHead, &socket->frameReadTail, framePrev);
      FrameFree(framePrev);
   }
 
   //Remove socket
   if(socket->state == IP_CLOSED || socket->state <= IP_UDP)
   {
      if(socket->prev == NULL)
         SocketHead = socket->next;
      else
         socket->prev->next = socket->next;
      if(socket->next)
         socket->next->prev = socket->prev;
      free(socket);
   }
   else
   {
      //Give application 10 seconds to stop using socket
      if(socket->state > IP_UDP)
         socket->state = IP_CLOSED;
      socket->timeout = 10;
   }
   OS_MutexPost(IPMutex);
}
 
 
void IPClose(IPSocket *socket)
{
   IPFrame *frameOut;
 
   IPWriteFlush(socket);
   if(socket->state <= IP_UDP)
   {
      IPClose2(socket);
      return;
   }
   frameOut = IPFrameGet(0);
   if(frameOut == NULL)
      return;
   frameOut->packet[TCP_FLAGS] = TCP_FLAGS_FIN | TCP_FLAGS_ACK;
   TCPSendPacket(socket, frameOut, TCP_DATA);
   ++socket->seq;
   if(socket->state == IP_FIN_CLIENT)
      IPClose2(socket);
   else
      socket->state = IP_FIN_SERVER;
}
 
 
void IPPrintf(IPSocket *socket, char *message,
              int arg0, int arg1, int arg2, int arg3)
{
   char buf[500], *ptr;
   if(socket == NULL)
   {
      printf(message, arg0, arg1, arg2, arg3);
      return;
   }
   ptr = strstr(message, "%");
   if(ptr == NULL)
      IPWrite(socket, (uint8*)message, (int)strlen(message));
   else
   {
      sprintf(buf, message, arg0, arg1, arg2, arg3, 0, 0, 0, 0);
      IPWrite(socket, (uint8*)buf, (int)strlen(buf));
   }
   if(socket->dontFlush == 0)
      IPWriteFlush(socket);
}
 
 
void IPTick(void)
{
   IPFrame *frame, *frame2;
   IPSocket *socket, *socket2;
   unsigned long ticks;
   static unsigned long ticksPrev=0, ticksPrev2=0;
 
   ticks = OS_ThreadTime();
   if(ticks - ticksPrev >= 95)
   {
      if(IPVerbose && (Seconds % 60) == 0)
      {
         if(FrameFreeCount >= FRAME_COUNT-1)
            printf("T");
         else
            printf("T(%d)", FrameFreeCount);
      }
      ++Seconds;
      if(--DhcpRetrySeconds <= 0)
         IPDhcp(NULL, 400, 1);   //DHCP request
   }
 
   OS_MutexPend(IPMutex);
 
   //Retransmit timeout packets
   for(frame = FrameResendHead; frame; )
   {
      frame2 = frame;
      frame = frame->next;
      frame2->timeout = (short)(frame2->timeout - (ticks - ticksPrev2));
      if(--frame2->timeout <= 0)
      {
         if(IPVerbose)
            printf("r");
         FrameRemove(&FrameResendHead, &FrameResendTail, frame2);
         IPSendFrame(frame2);
      }
   }
 
   if(ticks - ticksPrev >= 95)
   {
      //Close timed out sockets
      for(socket = SocketHead; socket; )
      {
         socket2 = socket;
         socket = socket->next;
         if(socket2->timeout && --socket2->timeout == 0)
         {
            socket2->timeout = 10;
            if(IPVerbose && socket2->state != IP_CLOSED &&
                            socket2->state != IP_FIN_SERVER)
               printf("t(%d,%d)", socket2->state, FrameFreeCount);
            if(socket2->state == IP_TCP)
               IPClose(socket2);
            else if(socket2->state == IP_FIN_CLIENT)
               IPClose(socket2);
            else
               IPClose2(socket2);
         }
      }
      ticksPrev = ticks;
   }
   OS_MutexPost(IPMutex);
   ticksPrev2 = ticks;
}
 
 
static void DnsCallback(IPSocket *socket)
{
   uint8 buf[200], *ptr;
   uint32 ipAddress;
   int bytes;
 
   memset(buf, 0, sizeof(buf));
   bytes = IPRead(socket, buf, sizeof(buf));
   if(buf[DNS_NUM_ANSWERS_RR+1])
   {
      for(ptr = buf + DNS_QUESTIONS; ptr + 14 <= buf + bytes; ++ptr)
      {
         if(ptr[0] == 0 && ptr[1] == 1 && ptr[2] == 0 && ptr[3] == 1 &&
            ptr[8] == 0 && ptr[9] == 4)
         {
            ipAddress = (ptr[10] << 24) | (ptr[11] << 16) | (ptr[12] << 8) | ptr[13];
            printf("ipAddress = %d.%d.%d.%d\n", ptr[10], ptr[11], ptr[12], ptr[13]);
            socket->userData = ipAddress;
            if(socket->userFunc)
            {
               socket->userFunc(socket, ipAddress, socket->userPtr);
            }
            break;
         }
      }
   }
   IPClose(socket);
}
 
 
void IPResolve(char *name, IPFuncPtr resolvedFunc, void *arg)
{
   uint8 buf[200], *ptr;
   int length, i;
   IPSocket *socket;
 
   socket = IPOpen(IP_MODE_UDP, ipAddressDns, DNS_PORT, DnsCallback);
   memset(buf, 0, sizeof(buf));
   buf[DNS_ID+1] = 1;
   buf[DNS_FLAGS] = 1;
   buf[DNS_NUM_QUESTIONS+1] = 1;
 
   //Setup name
   ptr = buf + DNS_QUESTIONS;
   strncpy((char*)ptr+1, name, 100);
   ptr[0] = 1;
   while(ptr[0])
   {
      for(i = 0; i < 100; ++i)
      {
         if(ptr[i+1] == '.' || ptr[i+1] == 0)
         {
            ptr[0] = (uint8)i;
            ptr += i+1;
            break;
         }
      }
   }
   ++ptr;
   ptr[1] = DNS_QUERY_TYPE_IP;
   ptr[3] = DNS_QUERY_CLASS;
   length = (int)(ptr - buf) + 4;
   if(length < 60)
      length = 60;
 
   socket->userFunc = (IPFuncPtr)resolvedFunc;
   socket->userPtr = arg;
   socket->userData = 0;
   IPWrite(socket, buf, length);
}
 

Line No.	Rev	Author	Line
1	155	rhoads	`/*--------------------------------------------------------------------`
2			`* TITLE: Plasma TCP/IP Protocol Stack`
3			`* AUTHOR: Steve Rhoads (rhoadss@yahoo.com)`
4			`* DATE CREATED: 4/22/06`
5			`* FILENAME: tcpip.c`
6			`* PROJECT: Plasma CPU core`
7			`* COPYRIGHT: Software placed into the public domain by the author.`
8			`* Software 'as is' without warranty. Author liable for nothing.`
9			`* DESCRIPTION:`
10			`* Plasma TCP/IP Protocol Stack`
11			`*`
12			`* Possible call stack when receiving a packet:`
13			`* IPMainThread()`
14			`* IPProcessEthernetPacket()`
15			`* IPProcessTCPPacket()`
16			`* TCPSendPacket()`
17			`* IPSendPacket()`
18			`* IPChecksum()`
19			`* IPSendFrame()`
20			`* FrameInsert()`
21			`--------------------------------------------------------------------/`
22			`#ifdef WIN32`
23			`#include <stdio.h>`
24			`#include <stdlib.h>`
25			`#include <string.h>`
26			`#include <assert.h>`
27			`#define _LIBC`
28			`#endif`
29			`#include "rtos.h"`
30	317	rhoads	`#define IPPRINTF`
31	155	rhoads	`#include "tcpip.h"`
32
33
34			`//ETHER FIELD OFFSET LENGTH VALUE`
35			`#define ETHERNET_DEST 0 //6`
36			`#define ETHERNET_SOURCE 6 //6`
37			`#define ETHERNET_FRAME_TYPE 12 //2 IP=0x0800; ARP=0x0806`
38
39			`//ARP FIELD OFFSET LENGTH VALUE`
40			`#define ARP_HARD_TYPE 14 //2 0x0001`
41			`#define ARP_PROT_TYPE 16 //2 0x0800`
42			`#define ARP_HARD_SIZE 18 //1 0x06`
43			`#define ARP_PROT_SIZE 19 //1 0x04`
44			`#define ARP_OP 20 //2 ARP=1;ARPreply=2`
45			`#define ARP_ETHERNET_SENDER 22 //6`
46			`#define ARP_IP_SENDER 28 //4`
47			`#define ARP_ETHERNET_TARGET 32 //6`
48			`#define ARP_IP_TARGET 38 //4`
49			`#define ARP_PAD 42 //18 0`
50
51			`//IP FIELD OFFSET LENGTH VALUE`
52			`#define IP_VERSION_LENGTH 14 //1 0x45`
53			`#define IP_TYPE_OF_SERVICE 15 //1 0x00`
54			`#define IP_LENGTH 16 //2`
55			`#define IP_ID16 18 //2`
56			`#define IP_FRAG_OFFSET 20 //2`
57			`#define IP_TIME_TO_LIVE 22 //1 0x80`
58			`#define IP_PROTOCOL 23 //1 TCP=0x06;PING=0x01;UDP=0x11`
59			`#define IP_CHECKSUM 24 //2`
60			`#define IP_SOURCE 26 //4`
61			`#define IP_DEST 30 //4`
62
63			`//PSEUDO FIELD OFFSET LENGTH VALUE`
64			`#define PSEUDO_IP_SOURCE 0 //4`
65			`#define PSEUDO_IP_DEST 4 //4`
66			`#define PSEUDO_ZERO 8 //1 0`
67			`#define PSEUDO_IP_PROTOCOL 9 //1`
68			`#define PSEUDO_LENGTH 10 //2`
69
70			`//UDP FIELD OFFSET LENGTH VALUE`
71			`#define UDP_SOURCE_PORT 34 //2`
72			`#define UDP_DEST_PORT 36 //2`
73			`#define UDP_LENGTH 38 //2`
74			`#define UDP_CHECKSUM 40 //2`
75			`#define UDP_DATA 42`
76
77			`//DHCP FIELD OFFSET LENGTH VALUE`
78			`#define DHCP_OPCODE 42 //1 REQUEST=1;REPLY=2`
79			`#define DHCP_HW_TYPE 43 //1 1`
80			`#define DHCP_HW_LEN 44 //1 6`
81			`#define DHCP_HOP_COUNT 45 //1 0`
82			`#define DHCP_TRANS_ID 46 //4`
83			`#define DHCP_NUM_SEC 50 //2 0`
84			`#define DHCP_UNUSED 52 //2`
85			`#define DHCP_CLIENT_IP 54 //4`
86			`#define DHCP_YOUR_IP 58 //4`
87			`#define DHCP_SERVER_IP 62 //4`
88			`#define DHCP_GATEWAY_IP 66 //4`
89			`#define DHCP_CLIENT_ETHERNET 70 //16`
90			`#define DHCP_SERVER_NAME 86 //64`
91			`#define DHCP_BOOT_FILENAME 150 //128`
92			`#define DHCP_MAGIC_COOKIE 278 //4 0x63825363`
93			`#define DHCP_OPTIONS 282 //N`
94
95			`#define DHCP_MESSAGE_TYPE 53 //1 type`
96			`#define DHCP_DISCOVER 1`
97			`#define DHCP_OFFER 2`
98			`#define DHCP_REQUEST 3`
99			`#define DHCP_ACK 5`
100			`#define DHCP_REQUEST_IP 50 //4 ip`
101			`#define DHCP_REQUEST_SERV_IP 54 //4 ip`
102			`#define DHCP_CLIENT_ID 61 //7 1 ethernet`
103			`#define DHCP_HOST_NAME 12 //6 plasma`
104			`#define DHCP_PARAMS 55 //4 1=subnet; 15=domain_name; 3=router; 6=dns`
105			`#define DHCP_PARAM_SUBNET 1`
106			`#define DHCP_PARAM_ROUTER 3`
107			`#define DHCP_PARAM_DNS 6`
108			`#define DHCP_END_OPTION 0xff`
109
110			`//DHCP FIELD OFFSET LENGTH VALUE`
111	206	rhoads	`#define DNS_ID 0 //2`
112			`#define DNS_FLAGS 2 //2`
113			`#define DNS_NUM_QUESTIONS 4 //2 1`
114			`#define DNS_NUM_ANSWERS_RR 6 //2 0/1`
115			`#define DNS_NUM_AUTHORITY_RR 8 //2 0`
116	155	rhoads	`#define DNS_NUM_ADDITIONAL_RR 10 //2 0`
117			`#define DNS_QUESTIONS 12 //2`
118
119			`#define DNS_FLAGS_RESPONSE 0x8000`
120			`#define DNS_FLAGS_RECURSIVE 0x0100`
121			`#define DNS_FLAGS_ERROR 0x0003`
122			`#define DNS_FLAGS_OK 0x0000`
123			`#define DNS_QUERY_TYPE_IP 1`
124			`#define DNS_QUERY_CLASS 1`
125			`#define DNS_PORT 53`
126
127			`//TCP FIELD OFFSET LENGTH VALUE`
128			`#define TCP_SOURCE_PORT 34 //2`
129			`#define TCP_DEST_PORT 36 //2`
130			`#define TCP_SEQ 38 //4`
131			`#define TCP_ACK 42 //4`
132			`#define TCP_HEADER_LENGTH 46 //1 0x50`
133			`#define TCP_FLAGS 47 //1 SYNC=0x2;ACK=0x10;FIN=0x1`
134			`#define TCP_WINDOW_SIZE 48 //2`
135			`#define TCP_CHECKSUM 50 //2`
136			`#define TCP_URGENT_POINTER 52 //2`
137			`#define TCP_DATA 54 //length-N`
138
139			`#define TCP_FLAGS_FIN 1`
140			`#define TCP_FLAGS_SYN 2`
141			`#define TCP_FLAGS_RST 4`
142	209	rhoads	`#define TCP_FLAGS_PSH 8`
143	155	rhoads	`#define TCP_FLAGS_ACK 16`
144
145			`//PING FIELD OFFSET LENGTH VALUE`
146			`#define PING_TYPE 34 //1 SEND=8;REPLY=0`
147			`#define PING_CODE 35 //1 0`
148			`#define PING_CHECKSUM 36 //2`
149			`#define PING_ID 38 //2`
150			`#define PING_SEQUENCE 40 //2`
151			`#define PING_DATA 44`
152
153			`static void IPClose2(IPSocket *Socket);`
154
155			`static uint8 ethernetAddressNull[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};`
156	206	rhoads	`static uint8 ethernetAddressGateway[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};`
157			`#ifndef WIN32`
158	155	rhoads	`static uint8 ethernetAddressPlasma[] = {0x00, 0x10, 0xdd, 0xce, 0x15, 0xd4};`
159	206	rhoads	`#else`
160			`static uint8 ethernetAddressPlasma[] = {0x00, 0x10, 0xdd, 0xce, 0x15, 0xd5};`
161			`#endif`
162	155	rhoads
163			`static uint8 ipAddressPlasma[] = {0x9d, 0xfe, 0x28, 10}; //changed by DHCP`
164			`static uint8 ipAddressGateway[] = {0xff, 0xff, 0xff, 0xff}; //changed by DHCP`
165			`static uint32 ipAddressDns; //changed by DHCP`
166
167	157	rhoads	`static OS_Mutex_t *IPMutex;`
168	296	rhoads	`static int FrameFreeCount;`
169	155	rhoads	`static IPFrame *FrameFreeHead;`
170			`static IPFrame *FrameSendHead;`
171			`static IPFrame *FrameSendTail;`
172			`static IPFrame *FrameResendHead;`
173			`static IPFrame *FrameResendTail;`
174			`static IPSocket *SocketHead;`
175			`static uint32 Seconds;`
176			`static int DhcpRetrySeconds;`
177			`static IPFuncPtr FrameSendFunc;`
178			`static OS_MQueue_t *IPMQueue;`
179	157	rhoads	`static OS_Thread_t *IPThread;`
180	155	rhoads	`int IPVerbose=1;`
181
182			`static const unsigned char dhcpDiscover[] = {`
183			`0xff, 0xff, 0xff, 0xff, 0xff, 0xff, //dest`
184			`0x00, 0x10, 0xdd, 0xce, 0x15, 0xd4, //src`
185			`0x08, 0x00,`
186			`0x45, 0x00, 0x01, 0x48, 0x2e, 0xf5, 0x00, 0x00, //ip`
187			`0x80, 0x11, 0x0a, 0xb1, 0x00, 0x00, 0x00, 0x00,`
188			`0xff, 0xff, 0xff, 0xff,`
189			`0x00, 0x44, 0x00, 0x43, 0x01, 0x34, 0x45, 0x66, //udp`
190			`0x01, 0x01, 0x06, 0x00, 0x69, 0x26, 0xb5, 0x52 //dhcp`
191			`};`
192
193	296	rhoads	`static unsigned char dhcpOptions[] = {`
194	155	rhoads	`0x63, 0x82, 0x53, 0x63, //cookie`
195			`0x35, 0x01, 0x01, //DHCP Discover`
196			`0x3d, 0x07, 0x01, 0x00, 0x10, 0xdd, 0xce, 0x15, 0xd4, //Client identifier`
197	206	rhoads	`#ifndef WIN32`
198	155	rhoads	`0x0c, 0x06, 'p', 'l', 'a', 's', 'm', 'a', //Host name`
199	206	rhoads	`#else`
200			`0x0c, 0x06, 'p', 'l', 'a', 's', 'm', 'b', //Host name`
201			`#endif`
202	155	rhoads	`0x37, 0x03, DHCP_PARAM_SUBNET, DHCP_PARAM_ROUTER, DHCP_PARAM_DNS, //Parameters`
203			`DHCP_END_OPTION`
204			`};`
205
206
207			`//Get a free frame; can be called from an ISR`
208	157	rhoads	`IPFrame *IPFrameGet(int freeCount)`
209	155	rhoads	`{`
210			`IPFrame *frame=NULL;`
211			`uint32 state;`
212	157	rhoads
213			`state = OS_CriticalBegin();`
214			`if(FrameFreeCount > freeCount)`
215	155	rhoads	`{`
216	157	rhoads	`frame = FrameFreeHead;`
217			`if(FrameFreeHead)`
218	296	rhoads	`{`
219	157	rhoads	`FrameFreeHead = FrameFreeHead->next;`
220	296	rhoads	`--FrameFreeCount;`
221			`}`
222	155	rhoads	`}`
223	157	rhoads	`OS_CriticalEnd(state);`
224	155	rhoads	`if(frame)`
225			`{`
226	157	rhoads	`assert(frame->state == 0);`
227			`frame->state = 1;`
228	155	rhoads	`}`
229			`return frame;`
230			`}`
231
232
233			`static void FrameFree(IPFrame *frame)`
234			`{`
235			`uint32 state;`
236
237			`assert(frame->state == 1);`
238			`frame->state = 0;`
239			`state = OS_CriticalBegin();`
240			`frame->next = FrameFreeHead;`
241			`FrameFreeHead = frame;`
242			`++FrameFreeCount;`
243			`OS_CriticalEnd(state);`
244			`}`
245
246
247			`static void FrameInsert(IPFrame head, IPFrame tail, IPFrame *frame)`
248			`{`
249			`assert(frame->state == 1);`
250			`frame->state = 2;`
251	157	rhoads	`OS_MutexPend(IPMutex);`
252	155	rhoads	`frame->prev = NULL;`
253			`frame->next = *head;`
254			`if(*head)`
255			`(*head)->prev = frame;`
256			`*head = frame;`
257			`if(*tail == NULL)`
258			`*tail = frame;`
259	157	rhoads	`OS_MutexPost(IPMutex);`
260	155	rhoads	`}`
261
262
263			`static void FrameRemove(IPFrame head, IPFrame tail, IPFrame *frame)`
264			`{`
265			`assert(frame->state == 2);`
266			`frame->state = 1;`
267			`if(frame->prev)`
268			`frame->prev->next = frame->next;`
269			`else`
270			`*head = frame->next;`
271			`if(frame->next)`
272			`frame->next->prev = frame->prev;`
273			`else`
274			`*tail = frame->prev;`
275			`frame->prev = NULL;`
276			`frame->next = NULL;`
277			`}`
278
279
280			`static int IPChecksum(int checksum, const unsigned char *data, int length)`
281			`{`
282			`int i;`
283			`checksum = ~checksum & 0xffff;`
284			`for(i = 0; i < length-1; i += 2)`
285			`{`
286			`checksum += (data[i] << 8) \| data[i+1];`
287			`}`
288			`if(i < length)`
289			`checksum += data[i] << 8;`
290			`while(checksum >> 16)`
291			`checksum = (checksum & 0xffff) + (checksum >> 16);`
292			`checksum = ~checksum & 0xffff;`
293			`return checksum;`
294			`}`
295
296
297			`static int EthernetVerifyChecksums(const unsigned char *packet, int length)`
298			`{`
299			`int checksum, length2;`
300			`unsigned char pseudo[12];`
301
302			`//Calculate checksums`
303			`if(packet[ETHERNET_FRAME_TYPE+1] == 0x00) //IP`
304			`{`
305			`checksum = IPChecksum(0xffff, packet+IP_VERSION_LENGTH, 20);`
306			`if(checksum)`
307			`return -1;`
308			`if(packet[IP_PROTOCOL] == 0x01) //PING`
309			`{`
310			`checksum = IPChecksum(0xffff, packet+PING_TYPE, length-PING_TYPE);`
311			`}`
312			`else if(packet[IP_PROTOCOL] == 0x11) //UDP`
313			`{`
314			`if(packet[UDP_CHECKSUM] == 0 && packet[UDP_CHECKSUM+1] == 0)`
315			`return 0;`
316			`memcpy(pseudo+PSEUDO_IP_SOURCE, packet+IP_SOURCE, 4);`
317			`memcpy(pseudo+PSEUDO_IP_DEST, packet+IP_DEST, 4);`
318			`pseudo[PSEUDO_ZERO] = 0;`
319			`pseudo[PSEUDO_IP_PROTOCOL] = packet[IP_PROTOCOL];`
320			`memcpy(pseudo+PSEUDO_LENGTH, packet+UDP_LENGTH, 2);`
321			`checksum = IPChecksum(0xffff, pseudo, 12);`
322			`length2 = (packet[UDP_LENGTH] << 8) + packet[UDP_LENGTH+1];`
323			`checksum = IPChecksum(checksum, packet+UDP_SOURCE_PORT, length);`
324			`}`
325			`else if(packet[IP_PROTOCOL] == 0x06) //TCP`
326			`{`
327			`memcpy(pseudo+PSEUDO_IP_SOURCE, packet+IP_SOURCE, 4);`
328			`memcpy(pseudo+PSEUDO_IP_DEST, packet+IP_DEST, 4);`
329			`pseudo[PSEUDO_ZERO] = 0;`
330			`pseudo[PSEUDO_IP_PROTOCOL] = packet[IP_PROTOCOL];`
331			`length = (packet[IP_LENGTH] << 8) + packet[IP_LENGTH+1];`
332			`length2 = length - 20;`
333			`pseudo[PSEUDO_LENGTH] = (unsigned char)(length2 >> 8);`
334			`pseudo[PSEUDO_LENGTH+1] = (unsigned char)length2;`
335			`checksum = IPChecksum(0xffff, pseudo, 12);`
336			`checksum = IPChecksum(checksum, packet+TCP_SOURCE_PORT, length2);`
337			`}`
338			`if(checksum)`
339			`return -1;`
340			`}`
341			`return 0;`
342			`}`
343
344
345			`static void IPFrameReschedule(IPFrame *frame)`
346			`{`
347			`int length;`
348			`length = frame->length - TCP_DATA;`
349	160	rhoads	`if(frame->packet[TCP_FLAGS] & (TCP_FLAGS_FIN \| TCP_FLAGS_SYN))`
350	155	rhoads	`++length;`
351			`if(frame->socket == NULL \|\| frame->socket->state == IP_UDP \|\| length == 0 \|\|`
352	209	rhoads	`frame->socket->state == IP_PING \|\| ++frame->retryCnt > 4)`
353	155	rhoads	`{`
354			`FrameFree(frame); //can't be ACK'ed`
355			`}`
356			`else`
357			`{`
358			`//Put on resend list until TCP ACK'ed`
359	317	rhoads	`frame->timeout = (short)(RETRANSMIT_TIME * frame->retryCnt);`
360	155	rhoads	`FrameInsert(&FrameResendHead, &FrameResendTail, frame);`
361			`}`
362			`}`
363
364
365			`static void IPSendFrame(IPFrame *frame)`
366			`{`
367			`uint32 message[4];`
368
369			`if(FrameSendFunc)`
370			`{`
371			`//Single threaded`
372			`FrameSendFunc(frame->packet, frame->length);`
373			`IPFrameReschedule(frame);`
374			`}`
375			`else`
376			`{`
377			`//Add Packet to send queue`
378			`FrameInsert(&FrameSendHead, &FrameSendTail, frame);`
379
380			`//Wakeup sender thread`
381			`message[0] = 2;`
382			`OS_MQueueSend(IPMQueue, message);`
383			`}`
384			`}`
385
386
387			`static void IPSendPacket(IPSocket socket, IPFrame frame, int length)`
388			`{`
389			`int checksum, length2=length;`
390			`unsigned char pseudo[12], *packet=frame->packet;`
391
392			`frame->length = (uint16)length;`
393
394			`//Calculate checksums`
395			`if(packet[ETHERNET_FRAME_TYPE+1] == 0x00) //IP`
396			`{`
397			`length2 = length - IP_VERSION_LENGTH;`
398			`packet[IP_LENGTH] = (uint8)(length2 >> 8);`
399			`packet[IP_LENGTH+1] = (uint8)length2;`
400			`memset(packet+IP_CHECKSUM, 0, 2);`
401			`checksum = IPChecksum(0xffff, packet+IP_VERSION_LENGTH, 20);`
402			`packet[IP_CHECKSUM] = (unsigned char)(checksum >> 8);`
403			`packet[IP_CHECKSUM+1] = (unsigned char)checksum;`
404	220	rhoads	`if(packet[IP_PROTOCOL] == 0x01) //ICMP & PING`
405	155	rhoads	`{`
406			`memset(packet+PING_CHECKSUM, 0, 2);`
407			`checksum = IPChecksum(0xffff, packet+PING_TYPE, length-PING_TYPE);`
408			`packet[PING_CHECKSUM] = (unsigned char)(checksum >> 8);`
409			`packet[PING_CHECKSUM+1] = (unsigned char)checksum;`
410			`}`
411			`else if(packet[IP_PROTOCOL] == 0x11) //UDP`
412			`{`
413			`length2 = length - UDP_SOURCE_PORT;`
414			`packet[UDP_LENGTH] = (uint8)(length2 >> 8);`
415			`packet[UDP_LENGTH+1] = (uint8)length2;`
416			`memcpy(pseudo+PSEUDO_IP_SOURCE, packet+IP_SOURCE, 4);`
417			`memcpy(pseudo+PSEUDO_IP_DEST, packet+IP_DEST, 4);`
418			`pseudo[PSEUDO_ZERO] = 0;`
419			`pseudo[PSEUDO_IP_PROTOCOL] = packet[IP_PROTOCOL];`
420			`memcpy(pseudo+PSEUDO_LENGTH, packet+UDP_LENGTH, 2);`
421			`checksum = IPChecksum(0xffff, pseudo, 12);`
422			`memset(packet+UDP_CHECKSUM, 0, 2);`
423			`length2 = (packet[UDP_LENGTH] << 8) + packet[UDP_LENGTH+1];`
424			`checksum = IPChecksum(checksum, packet+UDP_SOURCE_PORT, length2);`
425			`packet[UDP_CHECKSUM] = (unsigned char)(checksum >> 8);`
426			`packet[UDP_CHECKSUM+1] = (unsigned char)checksum;`
427			`}`
428			`else if(packet[IP_PROTOCOL] == 0x06) //TCP`
429			`{`
430			`memcpy(pseudo+PSEUDO_IP_SOURCE, packet+IP_SOURCE, 4);`
431			`memcpy(pseudo+PSEUDO_IP_DEST, packet+IP_DEST, 4);`
432			`pseudo[PSEUDO_ZERO] = 0;`
433			`pseudo[PSEUDO_IP_PROTOCOL] = packet[IP_PROTOCOL];`
434			`length2 = (packet[IP_LENGTH] << 8) + packet[IP_LENGTH+1];`
435			`length2 = length2 - 20;`
436			`pseudo[PSEUDO_LENGTH] = (unsigned char)(length2 >> 8);`
437			`pseudo[PSEUDO_LENGTH+1] = (unsigned char)length2;`
438			`checksum = IPChecksum(0xffff, pseudo, 12);`
439			`memset(packet+TCP_CHECKSUM, 0, 2);`
440			`checksum = IPChecksum(checksum, packet+TCP_SOURCE_PORT, length2);`
441			`packet[TCP_CHECKSUM] = (unsigned char)(checksum >> 8);`
442			`packet[TCP_CHECKSUM+1] = (unsigned char)checksum;`
443			`}`
444			`}`
445
446	160	rhoads	`length2 = length - TCP_DATA;`
447			`if(socket && (packet[TCP_FLAGS] & (TCP_FLAGS_FIN \| TCP_FLAGS_SYN)))`
448	155	rhoads	`length2 = 1;`
449			`frame->socket = socket;`
450			`frame->timeout = 0;`
451			`frame->retryCnt = 0;`
452			`if(socket)`
453			`frame->seqEnd = socket->seq + length2;`
454			`IPSendFrame(frame);`
455			`}`
456
457
458			`static void TCPSendPacket(IPSocket socket, IPFrame frame, int length)`
459			`{`
460			`uint8 *packet = frame->packet;`
461	160	rhoads	`int flags, count;`
462	155	rhoads
463			`flags = packet[TCP_FLAGS];`
464			`memcpy(packet, socket->headerSend, TCP_SEQ);`
465	220	rhoads	`packet[TCP_FLAGS] = (uint8)flags;`
466	155	rhoads	`if(flags & TCP_FLAGS_SYN)`
467			`packet[TCP_HEADER_LENGTH] = 0x60; //set maximum segment size`
468			`else`
469			`packet[TCP_HEADER_LENGTH] = 0x50;`
470			`packet[TCP_SEQ] = (uint8)(socket->seq >> 24);`
471			`packet[TCP_SEQ+1] = (uint8)(socket->seq >> 16);`
472			`packet[TCP_SEQ+2] = (uint8)(socket->seq >> 8);`
473			`packet[TCP_SEQ+3] = (uint8)socket->seq;`
474			`packet[TCP_ACK] = (uint8)(socket->ack >> 24);`
475			`packet[TCP_ACK+1] = (uint8)(socket->ack >> 16);`
476			`packet[TCP_ACK+2] = (uint8)(socket->ack >> 8);`
477			`packet[TCP_ACK+3] = (uint8)socket->ack;`
478	317	rhoads	`count = RECEIVE_WINDOW - (socket->ack - socket->ackProcessed);`
479			`if(count < 0)`
480			`count = 0;`
481	160	rhoads	`packet[TCP_WINDOW_SIZE] = (uint8)(count >> 8);`
482			`packet[TCP_WINDOW_SIZE+1] = (uint8)count;`
483	155	rhoads	`packet[TCP_URGENT_POINTER] = 0;`
484			`packet[TCP_URGENT_POINTER+1] = 0;`
485			`IPSendPacket(socket, frame, length);`
486			`}`
487
488
489			`static void EthernetCreateResponse(unsigned char *packetOut,`
490			`const unsigned char *packet,`
491			`int length)`
492			`{`
493			`//Swap destination and source fields`
494			`memcpy(packetOut, packet, length);`
495			`memcpy(packetOut+ETHERNET_DEST, packet+ETHERNET_SOURCE, 6);`
496			`memcpy(packetOut+ETHERNET_SOURCE, packet+ETHERNET_DEST, 6);`
497			`if(packet[ETHERNET_FRAME_TYPE+1] == 0x00) //IP`
498			`{`
499			`memcpy(packetOut+IP_SOURCE, packet+IP_DEST, 4);`
500			`memcpy(packetOut+IP_DEST, packet+IP_SOURCE, 4);`

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