IpHeaderFieldsTag.msg¶

Name	Type	Description
IpHeaderFieldsTag	class	The fields of a user-plane packet’s IP header that a node classifies and routes by, parsed once where the packet enters the node’s user plane (see attachIpHeaderFields()) and read by every later module of the node instead of the header itself, so a missing entry point aborts rather than silently re-parsing.

Source code¶

//
//                  Simu5G
//
// Copyright (C) 2026 Andras Varga (OpenSim Ltd)
//
// This file is part of a software released under the license included in file
// "license.pdf". Please read LICENSE and README files before using it.
// The above files and the present reference are part of the software itself,
// and cannot be removed from it.
//

import inet.common.INETDefs;
import inet.common.TagBase;
import inet.networklayer.common.L3Address;

namespace simu5g;

//
// The fields of a user-plane packet's IP header that a node classifies and
// routes by, parsed once where the packet enters the node's user plane (see
// attachIpHeaderFields()) and read by every later module of the node instead of
// the header itself, so a missing entry point aborts rather than silently
// re-parsing.
//
// The tag is node-local: across a node boundary only the header bytes carry this
// information, so every entry point parses afresh and replaces any tag already
// present. removeAllSimu5GTags() leaves it in place.
//
class IpHeaderFieldsTag extends inet::TagBase {
    inet::L3Address srcAddress;
    inet::L3Address destAddress;
    uint8_t tos;   // The DSCP and ECN octet: IPv4 Type of Service, IPv6 Traffic Class
}