124 lines
4.3 KiB
C#
124 lines
4.3 KiB
C#
// ----------------------------------------------------------------------------
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// ----------------------------------------------------------------------------
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///
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// Microsoft Research, Cambridge
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//
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using NetStack.Common;
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using System;
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using System.Diagnostics;
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using System.Net.IP;
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using Drivers.Net;
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#if !SINGULARITY
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using System.Net;
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using System.Net.Sockets; // for AddressFamily
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using System.Text.RegularExpressions;
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using System.Runtime.InteropServices;
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#endif
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namespace NetStack.Protocols
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{
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// An ethernet frame format
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public class EthernetFormat
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{
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// Ethernet protocol types:
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public const ushort PROTOCOL_IP = 0x0800;
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public const ushort PROTOCOL_ARP = 0x0806;
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public const ushort PROTOCOL_RARP = 0x8035;
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public const ushort PROTOCOL_IP6 = 0x86dd;
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public const ushort PROTOCOL_PAUSE = 0x8808; // must be sent to 01-80-C2-00-00-01
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public const ushort PROTOCOL_MAP = 0x4934; // unassigned according to http://map-ne.com/Ethernet/type.html
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public const ushort PROTOCOL_NLB = 0x886f; // Network Load Balancer - type allocated to Microsoft
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public const ushort PROTOCOL_LOOP = 0x0060; // Ethernet Loopback packet
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public const int MaxFrameSize = 1514; // YW: wo CRC (which is 4 bytes)
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public const int MinFrameSize = 60;
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public const int Size = 14;
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public class FrameHeader
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{
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EthernetAddress origin;
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EthernetAddress target;
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ushort protocol;
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public FrameHeader(EthernetAddress origin,
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EthernetAddress target,
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ushort protocol)
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{
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this.origin = origin;
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this.target = target;
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this.protocol = protocol;
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}
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public FrameHeader()
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{
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}
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}
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// parse "pkt" from "start" bytes in, and return the
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// "src" and "dst" Ethernet addresses, and the protocol
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// "type" Returns the byte offset of the next layer's
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// header.
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public static int Read(byte []! pkt,
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int start,
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out EthernetAddress src,
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out EthernetAddress dst,
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out ushort type)
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{
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dst = EthernetAddress.ParseBytes(pkt, start);
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src = EthernetAddress.ParseBytes(pkt, start+6);
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type = (ushort) ((pkt[start+12] << 8) | (pkt[start+13]));
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return start + 14;
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}
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public static bool Read(IBuffer! buf,
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out EthernetAddress src,
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out EthernetAddress dst,
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out ushort type)
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{
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bool b;
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b = buf.ReadEthernetAddress(out dst);
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b &= buf.ReadEthernetAddress(out src);
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b &= buf.ReadNet16(out type);
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return b;
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}
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// Write an Ethernet header to "pkt", starting at position "start".
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public static int Write(byte[]! pkt,
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int start,
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EthernetAddress src,
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EthernetAddress dst,
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ushort type)
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{
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dst.CopyOut(pkt, start);
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src.CopyOut(pkt, start + EthernetAddress.Length);
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pkt[start + 12] = (byte) (type >> 8);
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pkt[start + 13] = (byte) (type & 0xff);
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return start + 14;
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}
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public static bool IsEthernetProtocol(ushort id)
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{
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switch (id) {
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case PROTOCOL_IP: return true;
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case PROTOCOL_ARP: return true;
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case PROTOCOL_RARP: return true;
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case PROTOCOL_IP6: return true;
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case PROTOCOL_PAUSE: return true;
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case PROTOCOL_MAP: return true;
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case PROTOCOL_NLB: return true;
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case PROTOCOL_LOOP: return true;
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}
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return false;
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}
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}
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}
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