net: CJDNS overlay (--cjdns-reachable, --only-net=cjdns) - #652
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Tag fc00::/8 separately from IPv6 so --only-net can distinguish them. Keep learned CJDNS in peers v2; do not dial or advertise until reachable. Direct TCP for overlay (not SOCKS/SAM). Co-authored-by: Cursor <cursoragent@cursor.com>
only-net=cjdns without the reachable flag is a Config error, same honesty as onion-without-SOCKS. --listen on an fc00 address parses as CJDNS. Co-authored-by: Cursor <cursoragent@cursor.com>
First-class NixOS option. Runtime argv greps --cjdns-reachable. STREAM FORWARD may use listenOnion loopback when p2p.listen is false. Co-authored-by: Cursor <cursoragent@cursor.com>
NodeConfig::validate grew past cargo-crap 30 after CJDNS connect/only-net guards. Extract helpers and pin the connect-without-reachable path. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
Plan 08 (
docs/personal-node-plans/08-cjdns.md). Stacked on #651 (net/listen-onion).NetAddr::Cjdnsfrom BIP155AddrV2::Cjdns(fc00::/8only). Global unicast tagged as CJDNS is dropped. Peers v2 round-trips the overlay address.--cjdns-reachable(default off): dial via kernel IPv6 TCP;fc00::/8may appear in localaddresses. Off: do not dial; do not advertise ULA as a home IP.--only-net=cjdnswithout--cjdns-reachableis a Config error.--listen [fc00:…]:portparses as CJDNS;--no-listendoes not bind.cjdns.reachable;After/Wantscjdns.service. No in-process router and no TUN in CI.Test plan
cargo test -p rbitcoin-net --lib netaddr_cjdnscargo test -p rbitcoin-net --lib learn_addrv2_keeps_cjdnscargo test -p rbitcoin-net --lib cjdns_not_dialedcargo test -p rbitcoin-node --lib only_net_cjdnscargo test -p rbitcoin-node --lib listen_cjdnsnix build .#checks.x86_64-linux.nixos-module-eval --no-linknixos-module-runtimeDo not merge unless asked.
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