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