147 lines
4.3 KiB
C++
147 lines
4.3 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: eth_packetmaker.h,v 1.12 2011-01-24 20:35:51 vruppert Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2000-2009 The Bochs Project
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef _ETH_PACKETMAKER_H_
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#define _ETH_PACKETMAKER_H_
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#ifdef ETH_ARPBACK
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static const Bit8u internal_mac[]={0xB0, 0xC4, 0x20, 0x20, 0x00, 0x00, 0x00};
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static const Bit8u external_mac[]={0xB0, 0xC4, 0x20, 0x20, 0x00, 0x00, 0x00};
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static const Bit8u external_ip[]={ 192, 168, 0, 2, 0x00 };
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static const Bit8u ethtype_arp[]={0x08, 0x06, 0x00};
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static const Bit8u ethtype_ip[]={0x08, 0x00, 0x00};
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static const Bit8u prot_udp=17;
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static const Bit8u prot_tcp=6;
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class eth_packet {
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public:
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Bit8u buf[BX_PACKET_BUFSIZE];
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Bit32u len;
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};
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class eth_packetmaker {
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public:
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virtual bx_bool getpacket(eth_packet& inpacket) = 0;
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virtual bx_bool ishandler(const eth_packet& outpacket) = 0;
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virtual bx_bool sendpacket(const eth_packet& outpacket) = 0;
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};
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class eth_ARPmaker : public eth_packetmaker {
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public:
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void init(void);
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bx_bool ishandler(const eth_packet& outpacket);
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bx_bool sendpacket(const eth_packet& outpacket);
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bx_bool getpacket(eth_packet& inpacket);
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private:
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eth_packet pending;
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bx_bool is_pending;
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};
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class eth_IPmaker : eth_packetmaker {
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public:
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void init(void);
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virtual bx_bool ishandler(const eth_packet& outpacket)=0;
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virtual bx_bool sendpacket(const eth_packet& outpacket)=0;
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virtual bx_bool getpacket(eth_packet& inpacket)=0;
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protected:
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bx_bool sendable(const eth_packet& outpacket);
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Bit32u source(const eth_packet& outpacket);
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Bit32u destination(const eth_packet& outpacket);
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Bit8u protocol(const eth_packet& outpacket);
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const Bit8u * datagram(const eth_packet& outpacket);
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Bit32u datalen(const eth_packet& outpacket);
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//Build a header in pending, return header length in bytes.
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Bit32u build_packet_header(Bit32u source, Bit32u dest, Bit8u protocol, Bit32u datalen);
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eth_packet pending;
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bx_bool is_pending;
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//Bit8u Version; //=4 (4 bits)
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//It better be!
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//Bit8u IHL; //Header length in 32-bit bytes (4 bits)
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//Used to strip layer
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//Bit8u Type_of_Service; //not relevent, set to 0;
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//Ignore on receive, set to 0 on send.
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//Bit16u Total_Length;//length of the datagram in octets. use 576 or less;
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//Use 576 or less on send.
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//Use to get length on receive
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//Bit16u Identification;//Identifier for assembling fragments
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//Ignore, we'll drop fragments
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//Bit8u Flags;//0,Don't fragment, More Fragments (vs last fragment)
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//Set to 0 on send
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//Drop if more fragments set.
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//Bit16u Fragment Offset;//where in the datagram this fragment belongs
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//Should be 0 for send and receive.
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//Bit8u TTL;//Set to something sorta big.
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//Shouldn't be 0 on receive
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//Set to something big on send
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//Bit8u Protocol;
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//Defines Protocol.
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//TCP=?, UDP=?
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//Bit16u Header_Checksum;//16-bit one's complement of the one's complement
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//sum of all 16-bit words in header;
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//Could check on receive, must set on send.
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//Bit32u Source;//source address
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//Bit32u Destination;//destination address
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};
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/*
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class eth_TCPmaker : eth_packetmaker {
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};
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class eth_UDPmaker : eth_packetmaker {
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};
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*/
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class eth_ETHmaker : public eth_packetmaker {
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public:
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//handles all packets to a MAC addr.
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void init(void);
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virtual bx_bool getpacket(eth_packet& inpacket);
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virtual bx_bool ishandler(const eth_packet& outpacket);
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virtual bx_bool sendpacket(const eth_packet& outpacket);
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private:
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eth_ARPmaker arper;
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};
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#endif // ETH_ARPBACK
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#endif // _ETH_PACKETMAKER_H_
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