[TWiR] Call for Participation

[netstack3] Add reference counted HashMap

[netstack3] Verify behavior when attempting to forward IPv6 packets w/ forwarding disabled

[netstack3] Do not forward loopback addresses

[netstack3] Split IpProto into Ipv4Proto and Ipv6NextHeader

[netstack3] Send gratuitous ARP when a device is brought up

[netstack3] Figure out whether there's anything we need to do if we receive a malformed Ethernet frame

[netstack3] Figure out whether there's anything we need to do if we receive an unrecognized EtherType

[netstack3] Fuzz parsers and serializers

[netstack3] ARP: Add tests for ARP on a broadcast medium

[netstack3] Should we respond to inbound ICMP echo replies without sockets with a port unreachable error?

[netstack3] Make sure we properly handle unrecognized IPv6 next header values

[netstack3] Migrate all transport protocols to trait associated types

[netstack3] Implement InterfaceIndexToName and InterfaceNameToIndex

[netstack3] Deduplicate IGMP and MLD