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https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [uIP_Demo_IAR_ARM7/] [uip/] [uip_arch.c] - Rev 614
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/* * Copyright (c) 2001, Adam Dunkels. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote * products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * This file is part of the uIP TCP/IP stack. * * $Id: uip_arch.c 2 2011-07-17 20:13:17Z filepang@gmail.com $ * */ #include "uip.h" #include "uip_arch.h" #define BUF ((uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN]) #define IP_PROTO_TCP 6 /*-----------------------------------------------------------------------------------*/ void uip_add32(u8_t *op32, u16_t op16) { uip_acc32[3] = op32[3] + (op16 & 0xff); uip_acc32[2] = op32[2] + (op16 >> 8); uip_acc32[1] = op32[1]; uip_acc32[0] = op32[0]; if(uip_acc32[2] < (op16 >> 8)) { ++uip_acc32[1]; if(uip_acc32[1] == 0) { ++uip_acc32[0]; } } if(uip_acc32[3] < (op16 & 0xff)) { ++uip_acc32[2]; if(uip_acc32[2] == 0) { ++uip_acc32[1]; if(uip_acc32[1] == 0) { ++uip_acc32[0]; } } } } /*-----------------------------------------------------------------------------------*/ u16_t uip_chksum(u16_t *sdata, u16_t len) { u16_t acc; for (acc = 0; len > 1; len -= 2) { u16_t u = ((unsigned char *)sdata)[0] + (((unsigned char *)sdata)[1] << 8); if ((acc += u) < u) { /* Overflow, so we add the carry to acc (i.e., increase by one). */ ++acc; } ++sdata; } /* add up any odd byte */ if(len == 1) { acc += htons(((u16_t)(*(u8_t *)sdata)) << 8); if(acc < htons(((u16_t)(*(u8_t *)sdata)) << 8)) { ++acc; } } return acc; } /*-----------------------------------------------------------------------------------*/ u16_t uip_ipchksum(void) { return uip_chksum((u16_t *)&uip_buf[UIP_LLH_LEN], 20); } /*-----------------------------------------------------------------------------------*/ u16_t uip_tcpchksum(void) { u16_t hsum, sum; /* Compute the checksum of the TCP header. */ hsum = uip_chksum((u16_t *)&uip_buf[20 + UIP_LLH_LEN], 20); /* Compute the checksum of the data in the TCP packet and add it to the TCP header checksum. */ sum = uip_chksum((u16_t *)uip_appdata, (u16_t)(((((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - 40))); if((sum += hsum) < hsum) { ++sum; } if((sum += BUF->srcipaddr[0]) < BUF->srcipaddr[0]) { ++sum; } if((sum += BUF->srcipaddr[1]) < BUF->srcipaddr[1]) { ++sum; } if((sum += BUF->destipaddr[0]) < BUF->destipaddr[0]) { ++sum; } if((sum += BUF->destipaddr[1]) < BUF->destipaddr[1]) { ++sum; } if((sum += (u16_t)htons((u16_t)IP_PROTO_TCP)) < (u16_t)htons((u16_t)IP_PROTO_TCP)) { ++sum; } hsum = (u16_t)htons((((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - 20); if((sum += hsum) < hsum) { ++sum; } return sum; } /*-----------------------------------------------------------------------------------*/
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