Extend suite of ICMPv6 Messages

[zeeshanlakhani]

Background

ICMP messages are used by network devices, including routers, to send error messages and operational information indicating success or failure when communicating with another IP address. Examples include errors indicating when a requested service is not available or when a host or router could not be reached. We've implemented some ICMPv6 messages thus far in Capsule, but we'd like to include more.

Solution

Implement almost¹ all ICMPv6 message types in Capsule. For reference on how to handle these kinds of messages, please look at what's been implemented thus far @ https://github.com/capsule-rs/capsule/tree/master/core/src/packets/icmp/v6.

Format information for most messages can be found in RFC 4443, RFC 4861 for NDP (Neighborhood Discovery Protocol), RFC 2710 for Multicast Listener Discovery, as well as others (linked below).

Another helpful resource is available via IANA.

Message Types

Good First Issues from RFC 4443

• Destination Unreachable
• Packet Too Big
• Time Exceeded
• Parameter Problem
• Echo Request
• Echo Reply
• Router Solicitation
• Router Advertisement
• Neighbor Solicitation
• Neighbor Advertisement
• Redirect Message

Others

• Router Renumbering ~ RFC 2894
• Inverse Neighbor Discovery Solicitation ~ RFC 3122
• Inverse Neighbor Discovery Advertisement ~ RFC 3122
• Extended Echo Request ~ RFC 8335
• Extended Echo Reply ~ RFC 8335

¹ Not including Mobile IP, Registration Extensions, or some others here.

[plumenator]

FYI: I'm now working on the Parameter Problem message.

[zeeshanlakhani]

@plumenator awesome!