dev/etherpkt.hh

   1 /*
   2  * Copyright (c) 2002-2004 The Regents of The University of Michigan
   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 are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /* @file
  30  * Reference counted class containing ethernet packet data
  31  */
  32
  33 #ifndef __ETHERPKT_HH__
  34 #define __ETHERPKT_HH__
  35
  36 #include <iosfwd>
  37 #include <memory>
  38 #include <assert.h>
  39
  40 #include "sim/host.hh"
  41 #include "base/refcnt.hh"
  42 #include "base/inet_hdrs.hh"
  43
  44 class Checkpoint;
  45 /*
  46  * Reference counted class containing ethernet packet data
  47  */
  48 class EtherPacket : public RefCounted
  49 {
  50   public:
  51     uint8_t *data;
  52     int length;
  53
  54   public:
  55     EtherPacket() : data(NULL), length(0) {}
  56     EtherPacket(std::auto_ptr<uint8_t> d, int l)
  57         : data(d.release()), length(l) {}
  58     ~EtherPacket() { if (data) delete [] data; }
  59
  60   public:
  61     bool IsUnicast() { return data[0] == 0x00; }
  62     bool IsMulticast() { return data[0] == 0x01; }
  63     bool IsBroadcast() { return data[0] == 0xff; }
  64
  65     bool isIpPkt() {
  66         eth_header *eth = (eth_header *) data;
  67         return (eth->type == 0x8);
  68     }
  69     bool isTcpPkt(ip_header *ip) {
  70         return (ip->protocol == 0x6);
  71     }
  72     bool isTcpPkt() {
  73         ip_header *ip = getIpHdr();
  74         return (ip->protocol == 0x6);
  75     }
  76     bool isUdpPkt(ip_header *ip) {
  77         return (ip->protocol == 17);
  78     }
  79     bool isUdpPkt() {
  80         ip_header *ip = getIpHdr();
  81         return (ip->protocol == 17);
  82     }
  83
  84     ip_header *getIpHdr() {
  85         assert(isIpPkt());
  86         return (ip_header *) (data + sizeof(eth_header));
  87     }
  88
  89     tcp_header *getTcpHdr(ip_header *ip) {
  90         assert(isTcpPkt(ip));
  91         return (tcp_header *) ((uint8_t *) ip + (ip->vers_len & 0xf)*4);
  92     }
  93
  94     udp_header *getUdpHdr(ip_header *ip) {
  95         assert(isUdpPkt(ip));
  96         return (udp_header *) ((uint8_t *) ip + (ip->vers_len & 0xf)*4);
  97     }
  98     typedef RefCountingPtr<EtherPacket> PacketPtr;
  99
 100     void serialize(std::ostream &os);
 101     void unserialize(Checkpoint *cp, const std::string &section);
 102 };
 103
 104 typedef RefCountingPtr<EtherPacket> PacketPtr;
 105
 106 #endif // __ETHERPKT_HH__