0,0 → 1,143 |
/* |
* 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,v 1.2.2.1 2003/10/04 22:54:17 adam Exp $ |
* |
*/ |
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#include "uip.h" |
#include "uip_arch.h" |
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#define BUF ((uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN]) |
#define IP_PROTO_TCP 6 |
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/*-----------------------------------------------------------------------------------*/ |
void uip_add32(u8_t *op32, u16_t op16) |
{ |
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uip_acc32[3] = op32[3] + (op16 & 0xff); |
uip_acc32[2] = op32[2] + (op16 >> 8); |
uip_acc32[1] = op32[1]; |
uip_acc32[0] = op32[0]; |
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if(uip_acc32[2] < (op16 >> 8)) { |
++uip_acc32[1]; |
if(uip_acc32[1] == 0) { |
++uip_acc32[0]; |
} |
} |
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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; |
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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; |
} |
} |
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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; |
|
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/* 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))); |
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if((sum += hsum) < hsum) { |
++sum; |
} |
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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; |
} |
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if((sum += (u16_t)htons((u16_t)IP_PROTO_TCP)) < (u16_t)htons((u16_t)IP_PROTO_TCP)) { |
++sum; |
} |
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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) { |
++sum; |
} |
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return sum; |
} |
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