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广播组播强制TLL-1

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snltty
2025-08-05 17:16:29 +08:00
parent f029baf16a
commit e641f842f2
8 changed files with 86 additions and 41 deletions
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68
src/linker.libs/ChecksumHelper.cs
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@@ -10,11 +10,24 @@ namespace linker.libs
/// 计算IP包的校验和
/// </summary>
/// <param name="packet">一个完整的IP包</param>
public static unsafe void Checksum(ReadOnlyMemory<byte> packet)
/// <param name="payload">是否计算荷载协议校验和</param>
public static unsafe void Checksum(ReadOnlyMemory<byte> packet,bool payload = true)
{
fixed (byte* ptr = packet.Span)
{
Checksum(ptr, packet.Length);
Checksum(ptr, packet.Length, payload);
}
}
/// <summary>
/// 计算IP包的校验和
/// </summary>
/// <param name="packet">一个完整的IP包</param>
/// <param name="payload">是否计算荷载协议校验和</param>
public static unsafe void Checksum(ReadOnlySpan<byte> packet, bool payload = true)
{
fixed (byte* ptr = packet)
{
Checksum(ptr, packet.Length, payload);
}
}
/// <summary>
@@ -22,38 +35,41 @@ namespace linker.libs
/// </summary>
/// <param name="ptr">IP包指针</param>
/// <param name="length">IP包长度</param>
public static unsafe void Checksum(byte* ptr, int length)
/// <param name="payload">是否计算荷载协议校验和</param>
public static unsafe void Checksum(byte* ptr, int length, bool payload = true)
{
byte ipHeaderLength = (byte)((*ptr & 0b1111) * 4);
//重新计算IP头校验和
*(ushort*)(ptr + 10) = 0;
*(ushort*)(ptr + 10) = Checksum((ushort*)ptr, ipHeaderLength);
ProtocolType protocol = (ProtocolType)(*(ptr + 9));
switch (protocol)
if (payload)
{
case ProtocolType.Tcp:
{
*(ushort*)(ptr + ipHeaderLength + 16) = 0;
ulong sum = PseudoHeaderSum(ptr, (uint)(length - ipHeaderLength));
*(ushort*)(ptr + ipHeaderLength + 16) = Checksum((ushort*)(ptr + ipHeaderLength), (uint)length - ipHeaderLength, sum);
}
break;
case ProtocolType.Udp:
{
*(ushort*)(ptr + ipHeaderLength + 6) = 0;
ulong sum = PseudoHeaderSum(ptr, (uint)(length - ipHeaderLength));
*(ushort*)(ptr + ipHeaderLength + 6) = Checksum((ushort*)(ptr + ipHeaderLength), (uint)length - ipHeaderLength, sum);
}
break;
case ProtocolType.Icmp:
{
*(ushort*)(ptr + ipHeaderLength + 2) = 0;
*(ushort*)(ptr + ipHeaderLength + 2) = Checksum((ushort*)(ptr + ipHeaderLength), (uint)length - ipHeaderLength);
}
break;
ProtocolType protocol = (ProtocolType)(*(ptr + 9));
switch (protocol)
{
case ProtocolType.Tcp:
{
*(ushort*)(ptr + ipHeaderLength + 16) = 0;
ulong sum = PseudoHeaderSum(ptr, (uint)(length - ipHeaderLength));
*(ushort*)(ptr + ipHeaderLength + 16) = Checksum((ushort*)(ptr + ipHeaderLength), (uint)length - ipHeaderLength, sum);
}
break;
case ProtocolType.Udp:
{
*(ushort*)(ptr + ipHeaderLength + 6) = 0;
ulong sum = PseudoHeaderSum(ptr, (uint)(length - ipHeaderLength));
*(ushort*)(ptr + ipHeaderLength + 6) = Checksum((ushort*)(ptr + ipHeaderLength), (uint)length - ipHeaderLength, sum);
}
break;
case ProtocolType.Icmp:
{
*(ushort*)(ptr + ipHeaderLength + 2) = 0;
*(ushort*)(ptr + ipHeaderLength + 2) = Checksum((ushort*)(ptr + ipHeaderLength), (uint)length - ipHeaderLength);
}
break;
}
}
}
/// <summary>