libdb/uIP/uip_arch.c

   1 /*
   2  * Copyright (c) 2001, Adam Dunkels.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote
  14  *    products derived from this software without specific prior
  15  *    written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  18  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  23  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  26  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  27  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * This file is part of the uIP TCP/IP stack.
  30  *
  31  *
  32  */
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <stdio.h>
  37
  38 #include "uip.h"
  39 #include "uip_arch.h"
  40 #include "uip_ip.h"
  41 #include "uip_tcp.h"
  42 #include "uip_pbuf.h"
  43
  44
  45 /*-----------------------------------------------------------------------------------*/
  46 u16_t uip_chksum(u16_t *sdata, u32_t len)
  47 {
  48   u32_t acc;
  49
  50   for(acc = 0;len > 1;len -= 2) {
  51     acc += *sdata++;
  52   }
  53
  54   /* add up any odd byte */
  55   if(len==1) {
  56     acc += htons((u16_t)((((u8_t *)sdata)[0]&0xff)<<8));
  57   }
  58   while(acc>>16) acc = (acc&0xffffUL)+(acc>>16);
  59
  60   return (u16_t)acc;
  61 }
  62
  63 /*-----------------------------------------------------------------------------------*/
  64 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)
  65 {
  66         u32_t acc,len,rem;
  67         struct uip_pbuf *q;
  68
  69         acc = 0;
  70
  71         rem = proto_len;
  72         for(q=p;q!=NULL && rem>0;q=q->next) {
  73                 len = (rem>q->len)?q->len:rem;
  74                 acc += uip_chksum(q->payload,len);
  75                 rem -= len;
  76         }
  77
  78         acc += (src->addr&0xffffUL);
  79         acc += ((src->addr>>16)&0xffffUL);
  80         acc += (dst->addr&0xffffUL);
  81         acc += ((dst->addr>>16)&0xffffUL);
  82         acc += (u32_t)htons(proto);
  83         acc += (u32_t)htons(proto_len);
  84
  85         while(acc>>16) acc = (acc&0xffffUL)+(acc>>16);
  86
  87         return (u16_t)~(acc&0xffffUL);
  88 }
  89 /*-----------------------------------------------------------------------------------*/
  90 u16_t
  91 uip_ipchksum(void *dataptr,u16_t len)
  92 {
  93   return ~(uip_chksum(dataptr,len));
  94 }
  95
  96 u16_t uip_ipchksum_pbuf(struct uip_pbuf *p)
  97 {
  98   u32_t acc;
  99   struct uip_pbuf *q;
 100
 101   acc = 0;
 102   for(q = p; q != NULL; q = q->next) {
 103         acc += uip_chksum(q->payload,q->len);
 104   }
 105   while(acc>>16) acc = (acc&0xffffUL)+(acc>>16);
 106
 107   return (u16_t)~(acc & 0xffffUL);
 108 }
 109
 110 void uip_log(const char *filename,int line_nb,char *msg)
 111 {
 112         printf("%s(%d):\n%s\n",filename,line_nb,msg);
 113 }
 114
 115 /*-----------------------------------------------------------------------------------*/