C++ definition

This tag specifies the protocol of the packet.

Packet processing at the sender ===============================

| ApplicationData | whole packet has no protocol data part has no protocol

| UdpHeader ApplicationData | whole packet has UDP protocol data part has UDP protocol

| Ipv4Header UdpHeader ApplicationData | whole packet has IPv4 protocol data part has IPv4 protocol

EthernetMacHeader | Ipv4Header UdpHeader ApplicationData | whole packet has incomplete Ethernet protocol data part has IPv4 protocol

EthernetMacHeader | Ipv4Header UdpHeader ApplicationData | EthernetPadding EthernetFcs whole packet has Ethernet protocol data part has IPv4 protocol

| EthernetMacHeader Ipv4Header UdpHeader ApplicationData EthernetPadding EthernetFcs | whole packet has Ethernet protocol data part has Ethernet protocol

Packet processing at the receiver =================================

| EthernetMacHeader Ipv4Header UdpHeader ApplicationData EthernetPadding EthernetFcs | whole packet has Ethernet protocol data part has Ethernet protocol

EthernetMacHeader Ipv4Header UdpHeader ApplicationData EthernetPadding | EthernetFcs whole packet has Ethernet protocol data part has no protocol

EthernetMacHeader | Ipv4Header UdpHeader ApplicationData | EthernetPadding EthernetFcs whole packet has Ethernet protocol data part has IPv4 protocol

EthernetMacHeader Ipv4Header | UdpHeader ApplicationData | EthernetPadding EthernetFcs whole packet has Ethernet protocol data part has UDP protocol

EthernetMacHeader Ipv4Header UdpHeader | ApplicationData | EthernetPadding EthernetFcs whole packet has Ethernet protocol data part has no protocol

Usage diagram

The following diagram shows usage relationships between types. Unresolved types are missing from the diagram.

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Extends

Name	Type	Description
ProtocolTagBase	class	This is an abstract base class that should not be directly added as a tag.

Fields

Name	Type	Description
frontOffset	b	extra offset relative to the packet data part front offset
backOffset	b	extra offset relative to the packet data part back offset
protocol	Protocol	specifies a protocol (internal class with an artificial identifier)

Source code

//
// This tag specifies the protocol of the packet.
//
// Packet processing at the sender
// ===============================
//
// | ApplicationData |
//     whole packet has no protocol
//     data part has no protocol
//
// | UdpHeader ApplicationData |
//     whole packet has UDP protocol
//     data part has UDP protocol
//
// | Ipv4Header UdpHeader ApplicationData |
//     whole packet has IPv4 protocol
//     data part has IPv4 protocol
//
// EthernetMacHeader | Ipv4Header UdpHeader ApplicationData |
//     whole packet has incomplete Ethernet protocol
//     data part has IPv4 protocol
//
// EthernetMacHeader | Ipv4Header UdpHeader ApplicationData | EthernetPadding EthernetFcs
//     whole packet has Ethernet protocol
//     data part has IPv4 protocol
//
// | EthernetMacHeader Ipv4Header UdpHeader ApplicationData EthernetPadding EthernetFcs |
//     whole packet has Ethernet protocol
//     data part has Ethernet protocol
//
// Packet processing at the receiver
// =================================
//
// | EthernetMacHeader Ipv4Header UdpHeader ApplicationData EthernetPadding EthernetFcs |
//     whole packet has Ethernet protocol
//     data part has Ethernet protocol
//
// EthernetMacHeader Ipv4Header UdpHeader ApplicationData EthernetPadding | EthernetFcs
//     whole packet has Ethernet protocol
//     data part has no protocol
//
// EthernetMacHeader | Ipv4Header UdpHeader ApplicationData | EthernetPadding EthernetFcs
//     whole packet has Ethernet protocol
//     data part has IPv4 protocol
//
// EthernetMacHeader Ipv4Header | UdpHeader ApplicationData | EthernetPadding EthernetFcs
//     whole packet has Ethernet protocol
//     data part has UDP protocol
//
// EthernetMacHeader Ipv4Header UdpHeader | ApplicationData | EthernetPadding EthernetFcs
//     whole packet has Ethernet protocol
//     data part has no protocol
//
class PacketProtocolTag extends ProtocolTagBase
{
    b frontOffset = b(0); // extra offset relative to the packet data part front offset
    b backOffset = b(0); // extra offset relative to the packet data part back offset
}

File: src/inet/common/ProtocolTag.msg

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