NyLPC_cIPv4Payload.c

00001 /*********************************************************************************
00002  * PROJECT: MiMic
00003  * --------------------------------------------------------------------------------
00004  *
00005  * This file is part of MiMic
00006  * Copyright (C)2011 Ryo Iizuka
00007  *
00008  * MiMic is free software: you can redistribute it and/or modify
00009  * it under the terms of the GNU Lesser General Public License as published
00010  * by　the Free Software Foundation, either version 3 of the　License, or
00011  * (at your option) any later version.
00012  *
00013  * This program is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00016  * GNU General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public License
00019  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
00020  *
00021  * For further information please contact.
00022  *  http://nyatla.jp/
00023  *  <airmail(at)ebony.plala.or.jp> or <nyatla(at)nyatla.jp>
00024  *
00025  *
00026  * Parts of this file were leveraged from uIP:
00027  *
00028  * Copyright (c) 2001-2003, Adam Dunkels.
00029  * All rights reserved.
00030  *
00031  * Redistribution and use in source and binary forms, with or without
00032  * modification, are permitted provided that the following conditions
00033  * are met:
00034  * 1. Redistributions of source code must retain the above copyright
00035  *    notice, this list of conditions and the following disclaimer.
00036  * 2. Redistributions in binary form must reproduce the above copyright
00037  *    notice, this list of conditions and the following disclaimer in the
00038  *    documentation and/or other materials provided with the distribution.
00039  * 3. The name of the author may not be used to endorse or promote
00040  *    products derived from this software without specific prior
00041  *    written permission.
00042  *
00043  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
00044  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00045  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00046  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
00047  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00048  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
00049  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00050  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
00051  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00052  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00053  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00054  */
00055 #include "NyLPC_cIPv4Payload_protected.h"
00056 
00057 
00058 
00059 
00060 
00061 /*********************************************************************************
00062  * public 関数
00063  *********************************************************************************/
00064 
00065 
00066 
00067 
00068 void NyLPC_cIPv4Payload_initialize(NyLPC_TcIPv4Payload_t* i_inst)
00069 {
00070     return;
00071 }
00072 
00073 /**
00074  * IPパケットを格納したバッファをセットして、ペイロードのポインタを返します。
00075  * 失敗時はFALSE
00076  */
00077 NyLPC_TBool NyLPC_cIPv4Payload_attachRxBuf(NyLPC_TcIPv4Payload_t* i_inst,const void* i_buf,NyLPC_TUInt16 i_flagment_size)
00078 {
00079     i_inst->header=(const struct NyLPC_TIPv4Header*)i_buf;
00080     i_inst->payload.rawbuf=(const NyLPC_TUInt8*)i_buf+(i_inst->header->vhl & 0x0f)*4;
00081     //IPパケットのバージョンチェック
00082     if((i_inst->header->vhl & 0xf0)!=0x40){
00083         NyLPC_OnErrorGoto(Error);
00084     }
00085     //IPフレームサイズの調整
00086     if(NyLPC_ntohs(i_inst->header->len16)>i_flagment_size){
00087         NyLPC_OnErrorGoto(Error);
00088     }
00089     //フラグメントは許可しない。
00090     if ((NyLPC_ntohs(i_inst->header->ipoffset) & 0x3fff) != 0){
00091         NyLPC_OnErrorGoto(Error);
00092     }
00093     //IPv4ヘッダのチェックサムを確認
00094     if(!NyLPC_TIPv4Header_isCorrectIpCheckSum(i_inst->header))
00095     {
00096         NyLPC_OnErrorGoto(Error);
00097     }
00098     return NyLPC_TBool_TRUE;
00099 Error:
00100     return NyLPC_TBool_FALSE;
00101 }
00102 
00103 /*
00104  * TcpIpのRxバッファをセットします。
00105  * @todo いらない？
00106  */
00107 /*
00108 void* NyLPC_cIPv4Payload_setTcpRxBuf(NyLPC_TcIPv4Payload_t* i_inst,void* i_buf,NyLPC_TUInt16 i_flagment_size)
00109 {
00110     if(!NyLPC_cIPv4Payload_setRxBuf(i_inst,i_buf,i_flagment_size)){
00111         return NULL;
00112     }
00113     i_inst->header=(struct NyLPC_TIPv4Header*)i_buf;
00114     return i_inst->payload.rawbuf+(i_inst->payload.tcp->tcpoffset>>4)*4;
00115 }
00116 */
00117 
00118 
00119 const void* NyLPC_cIPv4Payload_detachBuf(NyLPC_TcIPv4Payload_t* i_inst)
00120 {
00121     const void* r=i_inst->header;
00122     NyLPC_ArgAssert(r!=NULL);
00123     i_inst->header=NULL;
00124     return r;
00125 }
00126 /* なんだっけっこれ？
00127 //1の補数v1にv2を加算する。
00128 static NyLPC_TUInt16 add16c(NyLPC_TUInt16 i_v1,NyLPC_TUInt16 i_v2)
00129 {
00130     NyLPC_TUInt16 t;
00131     t=i_v1+i_v2;
00132     return (t>i_v1)?t:t+1;
00133 }
00134 //1の補数v1から、v2を減算する。
00135 static NyLPC_TUInt16 sub16c(NyLPC_TUInt16 i_v1,NyLPC_TUInt16 i_v2)
00136 {
00137     NyLPC_TUInt16 t;
00138     t=i_v1-i_v2;
00139     return (t<i_v1)?t:t-1;
00140 }
00141 */
00142 
00143 
00144