add links messages

Introduce two new wire messages, LINKS and LINKS_REPLY (swarm::links).
A member answers with its links: for each peer, the transport, whether
it’s relayed, the RTT, and whether it’s dormant.  It answers members
only, at most every 5 s.  This bumps wire::VERSION to 7.  Every build
answers, with or without the feature, so every node needs this patch
before the map shows anything beyond its own node.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/swarm/peer/inbound.rs b/src/swarm/peer/inbound.rs
index 6a149a2..d4df6c7 100644
--- a/src/swarm/peer/inbound.rs
+++ b/src/swarm/peer/inbound.rs
@@ -160,6 +160,12 @@ pub(crate) async fn handle_message(
         transport::ParsedMessage::StatusReply(remote) => {
             on_status(state, &peer, &remote, reactivated).await;
         }
+        transport::ParsedMessage::Links(request) => {
+            crate::swarm::links::answer(state, &peer, request).await;
+        }
+        transport::ParsedMessage::LinksReply(reply) => {
+            crate::swarm::links::received(state, &peer, reply);
+        }
         transport::ParsedMessage::Who(_)
         | transport::ParsedMessage::Me(_)
         | transport::ParsedMessage::Ping(_)