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115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
/*
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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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*
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "uip.h"
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#include "uip_arch.h"
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#include "uip_ip.h"
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#include "uip_tcp.h"
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#include "uip_pbuf.h"
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/*-----------------------------------------------------------------------------------*/
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u16_t uip_chksum(u16_t *sdata, u32_t len)
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{
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u32_t acc;
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for(acc = 0;len > 1;len -= 2) {
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acc += *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)[0]&0xff)<<8));
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}
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while(acc>>16) acc = (acc&0xffffUL)+(acc>>16);
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return (u16_t)acc;
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}
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/*-----------------------------------------------------------------------------------*/
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u16_t uip_chksum_pseudo(struct uip_pbuf *p,struct uip_ip_addr *src,struct uip_ip_addr *dst,u8_t proto,u16_t proto_len)
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{
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u32_t acc,len,rem;
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struct uip_pbuf *q;
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acc = 0;
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rem = proto_len;
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for(q=p;q!=NULL && rem>0;q=q->next) {
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len = (rem>q->len)?q->len:rem;
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acc += uip_chksum(q->payload,len);
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rem -= len;
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}
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acc += (src->addr&0xffffUL);
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acc += ((src->addr>>16)&0xffffUL);
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acc += (dst->addr&0xffffUL);
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acc += ((dst->addr>>16)&0xffffUL);
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acc += (u32_t)htons(proto);
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acc += (u32_t)htons(proto_len);
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while(acc>>16) acc = (acc&0xffffUL)+(acc>>16);
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return (u16_t)~(acc&0xffffUL);
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}
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/*-----------------------------------------------------------------------------------*/
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u16_t
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uip_ipchksum(void *dataptr,u16_t len)
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{
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return ~(uip_chksum(dataptr,len));
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}
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u16_t uip_ipchksum_pbuf(struct uip_pbuf *p)
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{
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u32_t acc;
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struct uip_pbuf *q;
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acc = 0;
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for(q = p; q != NULL; q = q->next) {
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acc += uip_chksum(q->payload,q->len);
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}
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while(acc>>16) acc = (acc&0xffffUL)+(acc>>16);
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return (u16_t)~(acc & 0xffffUL);
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}
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void uip_log(const char *filename,int line_nb,char *msg)
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{
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printf("%s(%d):\n%s\n",filename,line_nb,msg);
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}
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/*-----------------------------------------------------------------------------------*/
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