C51 COMPILER V7.20   ICMP                                                                  12/25/2007 10:53:01 PAGE 1   


C51 COMPILER V7.20, COMPILATION OF MODULE ICMP
OBJECT MODULE PLACED IN .\icmp.obj
COMPILER INVOKED BY: C:\Program Files\Keil\C51\BIN\C51.EXE ..\TCPIP\icmp.c BROWSE DEBUG OBJECTEXTEND PRINT(.\icmp.lst) O
                    -BJECT(.\icmp.obj)

line level    source

   1          /*
   2           * Copyright (c) 2003 Electric Application Laboratory of NAN KAI University
   3           * All rights reserved.
   4           *
   5           * Redistribution and use in source and binary forms, with or without modification,
   6           * are permitted provided that the following conditions are met:
   7           *
   8           * 1. Redistributions of source code must retain the above copyright notice,
   9           *    this list of conditions and the following disclaimer.
  10           * 2. Redistributions in binary form must reproduce the above copyright notice,
  11           *    this list of conditions and the following disclaimer in the documentation
  12           *    and/or other materials provided with the distribution.
  13           * 3. The name of the author may not be used to endorse or promote products
  14           *    derived from this software without specific prior written permission.
  15           *
  16           * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  17           * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  18           * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  19           * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20           * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  21           * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  22           * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  23           * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  24           * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  25           * OF SUCH DAMAGE.
  26           *
  27           * Author: Li Zhanglin <wzzlin@nankai.edu.cn>
  28           *
  29           */
  30          
  31          #include "..\GloblDef\GloblDef.h"
  32          #include "..\TCPIP\TCPIPmem.h"
  33          #include "..\TCPIP\IP.h"
  34          #include "..\TCPIP\icmp.h"
  35          
  36          #if ICMP_EN
  37          /* MemHead->pStart is point to ICMP head */
  38          void ICMPInput(struct SMemHead DT_XDATA *MemHead)       REENTRANT_MUL
  39          {
  40   1              IP_ADDR ipaddr;
  41   1              struct SIPHead DT_XDATA *pIPHead;
  42   1      
  43   1              /* which type of icmp */
  44   1              switch(((struct SICMPEchoHead DT_XDATA *)(MemHead->pStart))->type)
  45   1              {
  46   2              case ICMP_TYPE_QUERY:
  47   2                      
  48   2                      /* chage type */
  49   2                      ((struct SICMPEchoHead DT_XDATA *)(MemHead->pStart))->type = ICMP_TYPE_REPLY;
  50   2      
  51   2                      /* adjust checksum. refer to lwip: if change type from 8 to 0,
  52   2                      for checksum, that is increasing 0x8000 and add flowed hight bit 
  53   2                      to bit 0.*/
  54   2                      if (((struct SICMPEchoHead DT_XDATA *)(MemHead->pStart))->CheckSum >= htons(0xffff - (((WORD)ICMP_TYPE_Q
C51 COMPILER V7.20   ICMP                                                                  12/25/2007 10:53:01 PAGE 2   

             -UERY) << 8))) 
  55   2                              ((struct SICMPEchoHead DT_XDATA *)(MemHead->pStart))->CheckSum += htons(((WORD)ICMP_TYPE_QUERY) << 8) +
             - 1;
  56   2                      else
  57   2                              ((struct SICMPEchoHead DT_XDATA *)(MemHead->pStart))->CheckSum += htons(((WORD)ICMP_TYPE_QUERY) << 8);
  58   2      
  59   2                      /*
  60   2                       *send this packet back, first fill some of IPHead field 
  61   2                       */
  62   2      
  63   2                      /* dec pStart and get ip head */
  64   2                      pIPHead = (struct SIPHead DT_XDATA *)(MemHead->pStart -= IP_HEAD_MIN_LEN);
  65   2      
  66   2                      /* exchange ipdest and ipscr */
  67   2                      ipaddr = pIPHead->IPDest;
  68   2                      pIPHead->IPDest = pIPHead->IPScr;
  69   2                      pIPHead->IPScr  = ipaddr;
  70   2      
  71   2                      /* ip total length not change */
  72   2      
  73   2                      /* protocol */
  74   2                      pIPHead->Protocol = IP_PROTOCOL_ICMP;
  75   2      
  76   2                      IPOutput(MemHead);
  77   2      
  78   2                      /* whether send success or not free this packet */
  79   2                      MemFree(MemHead);
  80   2                      
  81   2                      break;
  82   2              default:
  83   2                      MemFree(MemHead);
  84   2              }
  85   1      }
  86          
  87          #endif


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    272    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       6
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)