author | Gustavo J. A. M. Carneiro <gjc@inescporto.pt> |
Fri, 11 Jul 2008 18:39:19 +0100 | |
changeset 3416 | 926ccb845111 |
parent 3260 | 8c0ab08144e6 |
permissions | -rw-r--r-- |
235
190d5bef3254
add ipv4 and udp header, add ipv4 checksum support to make the udp header compile. Need to be fixed in UdpHeader later.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
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/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */ |
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/* |
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* Copyright (c) 2005,2006,2007 INRIA |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation; |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
190d5bef3254
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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* Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr> |
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*/ |
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#include "ipv4-checksum.h" |
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|
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namespace ns3 { |
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|
190d5bef3254
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uint16_t |
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Ipv4ChecksumCalculate (uint16_t checksum, uint8_t *buffer, uint16_t size) |
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{ |
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/* see RFC 1071 to understand this code. */ |
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uint32_t sum = checksum; |
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uint16_t *data = (uint16_t *) buffer; |
190d5bef3254
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for (uint16_t i = 0; i < (size/2); i++) { |
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sum += data[i]; |
190d5bef3254
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} |
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if ((size % 2) != 0) { |
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uint8_t tmpBuf[2]; |
190d5bef3254
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tmpBuf[0] = buffer[size-1]; |
190d5bef3254
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tmpBuf[1] = 0; |
190d5bef3254
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data = (uint16_t *)tmpBuf; |
190d5bef3254
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sum += *data; |
190d5bef3254
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} |
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while (sum >> 16) { |
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sum = (sum & 0xffff) + (sum >> 16); |
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} |
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return sum; |
190d5bef3254
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} |
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|
190d5bef3254
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uint16_t |
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Ipv4ChecksumComplete (uint16_t checksum) |
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{ |
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return ~checksum; |
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} |
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190d5bef3254
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}; //namespace ns3 |