eaf66f4658
base/inet.cc:
we can't use a uint16_t for the intermediate checksum values
since there may be some bits that carry.
the length that is added in the pseudo header is the length of
the tcp portion only.
base/inet.hh:
silly me, the ip_hlen field is in terms of 4-byte words.
when caclulating checksum, we're dealing with network byte order,
so don't bother doing any byteswapping.
--HG--
extra : convert_revision : 993e3413e9febea0ba2fb6ba8bf04c053cca15ed
62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
/*
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* Copyright (c) 2002-2003 The Regents of The University of Michigan
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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 are
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* met: 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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* 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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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sstream>
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#include <string>
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#include "base/cprintf.hh"
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#include "sim/host.hh"
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#include "base/inet.hh"
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using namespace std;
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string
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eaddr_string(const uint8_t a[6])
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{
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stringstream stream;
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ccprintf(stream, "%x:%x:%x:%x:%x:%x", a[0], a[1], a[2], a[3], a[4], a[5]);
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return stream.str();
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}
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uint16_t
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IpHdr::ip_cksum() const
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{
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int sum = ip_cksum_add(this, hlen(), 0);
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sum = ip_cksum_carry(sum);
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return sum;
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}
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uint16_t
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IpHdr::tu_cksum() const
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{
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int sum = ip_cksum_add(payload(), len() - hlen(), 0);
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sum = ip_cksum_add(&ip_src, 8, sum); // source and destination
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sum += htons(ip_p + len() - hlen());
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sum = ip_cksum_carry(sum);
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return sum;
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}
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