2002-10-19 12:59:30 +00:00
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/*
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* Copyright (c) 2001, 2002 Swedish Institute of Computer Science.
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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 modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* 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 products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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/* inet.c
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*
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* Functions common to all TCP/IP modules, such as the Internet checksum and the
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* byte order functions.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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#include "lwip/debug.h"
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#include "lwip/arch.h"
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#include "lwip/def.h"
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#include "lwip/inet.h"
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/*-----------------------------------------------------------------------------------*/
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static u16_t
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lwip_chksum(void *dataptr, int 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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2002-10-24 13:20:42 +00:00
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acc = acc + *((u16_t *)dataptr)++;
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2002-10-19 12:59:30 +00:00
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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 *)dataptr) & 0xff) << 8);
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DEBUGF(INET_DEBUG, ("inet: chksum: odd byte %d\n", *(u8_t *)dataptr));
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}
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acc = (acc >> 16) + (acc & 0xffffUL);
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2002-10-20 15:20:30 +00:00
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if((acc & 0xffff0000) != 0) {
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2002-10-19 12:59:30 +00:00
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acc = (acc >> 16) + (acc & 0xffffUL);
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}
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return (u16_t)acc;
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}
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/*-----------------------------------------------------------------------------------*/
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/* inet_chksum_pseudo:
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*
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* Calculates the pseudo Internet checksum used by TCP and UDP for a pbuf chain.
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*/
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/*-----------------------------------------------------------------------------------*/
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u16_t
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inet_chksum_pseudo(struct pbuf *p,
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struct ip_addr *src, struct ip_addr *dest,
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u8_t proto, u16_t proto_len)
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{
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u32_t acc;
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struct pbuf *q;
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u8_t swapped;
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acc = 0;
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swapped = 0;
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for(q = p; q != NULL; q = q->next) {
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acc += lwip_chksum(q->payload, q->len);
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while(acc >> 16) {
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acc = (acc & 0xffffUL) + (acc >> 16);
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}
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if(q->len % 2 != 0) {
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swapped = 1 - swapped;
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acc = ((acc & 0xff) << 8) | ((acc & 0xff00UL) >> 8);
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}
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}
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if(swapped) {
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acc = ((acc & 0xff) << 8) | ((acc & 0xff00UL) >> 8);
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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 += (dest->addr & 0xffffUL);
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acc += ((dest->addr >> 16) & 0xffffUL);
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acc += (u32_t)htons((u16_t)proto);
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acc += (u32_t)htons(proto_len);
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while(acc >> 16) {
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acc = (acc & 0xffffUL) + (acc >> 16);
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}
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return ~(acc & 0xffffUL);
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}
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/*-----------------------------------------------------------------------------------*/
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/* inet_chksum:
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*
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* Calculates the Internet checksum over a portion of memory. Used primarely for IP
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* and ICMP.
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*/
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/*-----------------------------------------------------------------------------------*/
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u16_t
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inet_chksum(void *dataptr, u16_t len)
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{
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u32_t acc;
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acc = lwip_chksum(dataptr, len);
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while(acc >> 16) {
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acc = (acc & 0xffff) + (acc >> 16);
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}
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return ~(acc & 0xffff);
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}
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/*-----------------------------------------------------------------------------------*/
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u16_t
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inet_chksum_pbuf(struct pbuf *p)
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{
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u32_t acc;
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struct pbuf *q;
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u8_t swapped;
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acc = 0;
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swapped = 0;
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for(q = p; q != NULL; q = q->next) {
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acc += lwip_chksum(q->payload, q->len);
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while(acc >> 16) {
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2002-11-06 10:00:32 +00:00
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acc = (acc & 0xffffUL) + (acc >> 16);
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2002-10-19 12:59:30 +00:00
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}
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if(q->len % 2 != 0) {
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swapped = 1 - swapped;
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2002-11-06 10:00:32 +00:00
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acc = (acc & 0x00ffUL << 8) | (acc & 0xff00UL >> 8);
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2002-10-19 12:59:30 +00:00
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}
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}
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if(swapped) {
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2002-11-06 10:00:32 +00:00
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acc = ((acc & 0x00ffUL) << 8) | ((acc & 0xff00UL) >> 8);
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2002-10-19 12:59:30 +00:00
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}
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2002-11-06 10:00:32 +00:00
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return ~(acc & 0xffffUL);
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2002-10-19 12:59:30 +00:00
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}
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/*-----------------------------------------------------------------------------------*/
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