Add support for SCION addresses #285
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Hey everyone,
We'd like to upstream libp2p support for the SCION [1] Internet architecture and are therefor aiming to add scion to the multiaddr repo as preliminary step.
This PR adds support for multiaddrs like
/scion/19-ffaa:1:1079. SCION IAs consist of a 16-bit ISD and a 48-bit AS number separated by -. ISD numbers are formatted as decimal (19), AS numbering is similar to IPv6 (ffaa:1:1079). [2]. A SCION multiaddr can encapsulate an IP address to specify an endpoint, e.g. /scion/19-ffaa:1:1079/ip4/127.0.0.1.Notably, SCION is a routing protocol that also provides its own address format (specifically ISD-AS) but for host-addresses themselves (inside the ASes) regular IPv4/IPv6 addressing is used. That's why we see great fit here in the multiaddr repo!
We have already reserved a corresponding protocol identifier in multiformats/multicodec#325. There also is an experimental go-libp2p SCION+QUIC transport available at netsys-lab/go-libp2p@7ea953a.
Looking forward to your feedback!
Cheers,
Marten
Footnotes
[1] https://scion-architecture.net/
[2] https://docs.scion.org/en/latest/overview.html#isd-and-as-numbering