tree d55718dff124527f1139ddc8481f5e4cc4f3f39e
parent abeb02fc523606ee309992108d962cfec06a071c
author Abtin Keshavarzian <abtink@google.com> 1594230060 -0700
committer GitHub <noreply@github.com> 1594230060 -0700
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[udp/tcp/icmp] simplify Header parsing, and declare related types as nested (#5203)

This commit contains two main changes in `Ip6` modules: `Udp`, `Tcp`,
and `Icmp`. First, it simplifies the `Header` types defining constant
`enum` for byte offset of different fields in the header (these
replace the static methods and avoid use of `offsetof` macro). Second
change is it declare related types in each module as nested types of
the the main class (place them under the namespace of the main type).
For example `Icmp::Header`, `Udp::Socket` respectively replace
`IcmpHeader`, `UdpSocket` types.